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31	Material theory and computing	ABS-41
Prediction of Corrosion Inhibition Efficiency of Drugs on Steel Surfaces using Machine Learning-Based Model T. Sutojo, Noor Ageng Setiyanto, Muhamad Akrom, Wise Herowati, Achmad Wahid Kurniawan, Kevin Aliffanova Ardisa, Supriadi Rustad, and Wahyu Aji Eko Prabowo* Research Center for Materials Informatics, Faculty of Computer Science, Dian Nuswantoro University, Semarang 50131, Indonesia *prabowo[at]dsn.dinus.ac.id Abstract Steel is an iron alloy that is widely used for industrial applications. Steel is highly important for its mechanical properties. However, the electrochemical interaction of the steel surface with the environment causes corrosion. A corrosion inhibitor is a chemical substance that when added to metal surfaces can reduce the corrosion rate that occurs on the metal. Some of the drugs are corrosion inhibitors that can be used for inhibiting the corrosion process on steel surfaces. Experimental investigations in promoting potential inhibitor compound candidates are time-consuming and expensive. This work proposes modeling the quantitative structure-activity relationship (QSAR) studies using a random forest (RF) algorithm as a machine learning model to predict the corrosion inhibitor performance of drug molecules as corrosion inhibitors on steel surfaces. In this study, the RF model was evaluated using seven predefined test data, resulting: MAPE = 4.56%, RMSE = 4.43, and MSE = 19.64. Meanwhile, compared with other studies stated that the ARX model gave predictions of MAPE = 5.18%, RMSE = 4.87, and MSE = 23.8. In addition, the ARX model produces unrealistic predictions for some drug molecules, including Ethosuximide, Hexetidine, Methacycline, Glycine, and Sulfadiazine. On the other hand, the RF model produces realistic predictions for all five drug molecules. This study brings new insight into machine learning models in predicting corrosion inhibitors on steel surfaces. Keywords: corrosion- corrosion inhibitor- inhibition efficiency- drugs- random forest model- machine learning Share Link | Plain Format | Corresponding Author (Wahyu Aji Eko Prabowo)

32	Material theory and computing	ABS-46
QSPR Model for Predicting Inhibition Capacities of Pyridazine-Based Corrosion Inhibitors on Mild Steel Usman Sudibyo, T.Sutojo, Muhamad Akrom, Wise Herowati, Gustina Alfa Trisnapradika, Wahyu Aji Eko Prabowo, and Supriadi Rustad* Research Center for Materials Informatics, Faculty of Computer Science, Dian Nuswantoro University, 50131 Semarang, Indonesia *srustad[at]dsn.dinus.ac.id Abstract Mild steel is an important material because it has excellent mechanical properties and low production costs. However, mild steel is susceptible to corrosion in acidic media in the process, which results in negative impacts on industrial processes. Several molecules are proposed as corrosion inhibitors, one of which is Pyridazine. Experimental research and DFT modeling are time-consuming and expensive. Therefore, a machine learning approach is needed to overcome this problem. The model used is Kernel-Ridge Regression. From previous studies, using 20 samples of Pyridazine molecular dataset, with the Artificial Neural Network (ANN) model, the results obtained are, MSE = 111.5910, RMSE = 10.5637, and MAPE = 10.2362%. We split the same dataset into 80:20 for training and testing. The Kernel-Ridge Regression model is used as the validation model for Leave-One-Out Cross-Validation (LOOCV), with the following results: MSE = 14.9956, RMSE = 3.8724, and MAPE = 3.7147%. The outcomes we got outperform those of the ANN model. These prediction results can be used to help design new corrosion inhibitor molecules. Keywords: Corrosion- inhibition efficiency- pyridazine-machine-learning- kernel ridge regression Share Link | Plain Format | Corresponding Author (Usman Sudibyo)

33	Material theory and computing	ABS-47
Machine Learning-Based Model for Predicting Performances of Pyridines-Quinolines as Corrosion Inhibitors on Iron Surfaces Muhamad Akrom1, Setyo Budi1, T. Sutojo1, Gustina Alfa Trisnapradika1, Aries Setiawan1, Wahyu Aji Eko Prabowo1, Hermawan Kresno Dipojono2, and Supriadi Rustad1* 1Research Center for Materials Informatics, Faculty of Computer Science, Dian Nuswantoro University, Semarang 50131, Indonesia 2Advanced Functional Materials Research Group, Bandung Institute of Technology, Jl. Ganesha No. 10, Bandung 40132, Indonesia *srustad[at]dsn.dinus.ac.id Abstract Corrosion of materials is a significant concern for the industrial and academic fields since corrosion causes enormous losses in various fields such as economics, environment, society, industry, security, safety, and others. Currently, the control of material deterioration using organic compounds has become popular. Pyridines and quinolines stand out as corrosion inhibitors among a myriad of organic compounds because they are non-toxic, inexpensive, and effective in a wide variety of corrosive environments. Experimental investigations in developing a variety of potential inhibitor compound candidates require time and intensive resources. In this work, we use the Nu-SVR algorithm as a machine learning model to predict the corrosion inhibition performance of 41 pyridine-quinoline derivatives as corrosion inhibitors on iron surfaces. We split the dataset of 41 molecules into training and testing sets with a ratio of 70:30. We found that the NuSVR model results in RMSE = 6.21 %, performing better prediction ability than the GA-ANN model (RMSE = 8.83 %) of previous study on the same dataset. For evaluation, we used the entire dataset of 41 molecules for testing and found that the NuSVR model also showed better predictive results with RMSE = 12.23 % and R2 = 0.87, compared to the GA-ANN model which exhibited RMSE = 14.98 % and R2 = 0.80. The relationship between the inhibition efficiency and the quantum chemical descriptor was interpreted through the value of the important features. Overall, our study provides new insights regarding the machine learning model in predicting corrosion inhibitors on iron surfaces. Keywords: corrosion, corrosion inhibitor, pyridine, quinoline, Nu-SVR, machine learning Share Link | Plain Format | Corresponding Author (Setyo Budi)

34	Material theory and computing	ABS-78
Study of liquid filling transition on structured surfaces using a phase field method Fandi Oktasendra (a, b*), Jack R. Panter (a), Halim Kusumaatmaja (a) (a) Department of Physics, Durham University, Durham DH1 3LE, United Kingdom (b) Department of Physics, Universitas Negeri Padang, Padang 25131, Indonesia *fandi.oktasendra[at]durham.ac.uk Abstract We study the filling transition of thin liquid film on a structured surface using the phase field model for a binary liquid-gas phase system. The long-range interactions between fluid and solid, which control the wettability of the thin film, are incorporated in the free energy functional. Upon the variation of pressure in the liquid phase relative to the gas phase, \(\Delta P \) (\(\Delta P = P_{\rm{liquid}} - P_{\rm{gas}})\), we have identified several interesting behaviours: 1) at large negative \(\Delta P \), the thin liquid interface follows the shape of structured surface, 2) lowering the value of \(\Delta P \) allows the thin film thickness to increase, and the liquid to fill the structured surface until it forms a flat interface, 3) the filling transition, which is marked by a sudden increase of the film thickness, occurs at some critical \(\Delta P \) depending on the roughness of the structured surface. These findings could be insightful for wide-ranging applications involving thin liquid films, such as in heat exchange or microfluidic devices. Keywords: Liquid filling transition- Thin liquid film- Wetting on structured surfaces- Phase field method Share Link | Plain Format | Corresponding Author (Fandi Oktasendra)

35	Material theory and computing	ABS-86
The Impact of Functional Group in Anthraquinone (AQ) on the surface of carbon layers: A SCC-DFTB Computational Study Wahyu Dita Saputri Research Center for Quantum Physics, National Research and Innovation Agency (BRIN) Abstract The functional group has a critical role in material and chemical substance properties. For instance, the compounds of battery electrodes need to be concerned about the functional groups to enhance their performances. The Self-consistent charge density functional theory (SCC-DFTB) is a computational method that was performed to determine the effect of the functional groups (-NH2, -OH, -CH3, -CHO, -CN) in Anthraquinone (AQ) on a various number of carbon layers. The basin hopping global minimization at the SCC DFTB/3ob level was employed to obtain the best conformation. The interaction of these compounds with the Natrium (Na) ion was also the subject of the study since Na is promising enough for future energy storage. This computational result shows that the number of the carbon layer and the functional group have specific impacts on the surface material properties. Keywords: Functional Group- Anthraquinone- SCC-DFTB Share Link | Plain Format | Corresponding Author (Wahyu Dita Saputri)

36	Material theory and computing	ABS-94
Efficient Simulation of Electronic Properties of Quantum Many-Particle Systems using Classical Computers Ahmad Ridwan Tresna Nugraha (a*) a) Research Center for Quantum Physics, National Research and Innovation Agency (BRIN) B.J. Habibie Science and Technology Park, South Tangerang 15314, Indonesia *ahmad.ridwan.tresna.nugraha[at]brin.go.id Abstract Nanomaterials, as a particular group of quantum many-particle systems, basically require quantum computers for efficient simulation of their electronic properties. Unfortunately, despite the availability of some quantum computers on the lab scale, it is safe to say that no functional quantum computer is currently accessible freely to the public. Therefore, the development of efficient electronic structure calculations for quantum many-particle systems using classical computers is still necessary. In this work, we propose a novel Monte Carlo simulation within the phase-space formulation of quantum mechanics by taking into account a global-nonseparable random variable whose strength is restricted by the order of the Planck constant. Compared to the variational Monte Carlo (VMC) simulation in the conventional representation, we find that energy expectation values of several quantum systems, such as bosons, a hydrogen atom, and a helium atom, can be calculated by our method with a reasonable accuracy yet much better calculation time (> 10 times faster) at a large sampling \(N\) of random numbers (e.g., \(N > 10^5\) samples). The origin of the speedup is the absence of repetitive Monte Carlo (MC) sampling in our phase-space formulation. Unlike the conventional VMC that needs multiple MC sampling upon parameter optimization, our method only requires one-time MC sampling. Keywords: Electronic Structure- Monte Carlo Simulation- Many-Particle Systems Share Link | Plain Format | Corresponding Author (Ahmad Ridwan Tresna Nugraha)

37	Materials for energy	ABS-4
The Effect of Ni on Thermoelectric Properties of Cu1-xNixS at AmbientTemperature Reza Akbar Pahlevi (a), Markus Diantoro (a,b*), Muhammad Syolahudin Abdurrhaman (a), Alma Nur Roisatul Masruhah (a), Chusnana Insjaf Yogihati (a,b) a). Department of Physics, Faculty of Mathematics, Universitas Negeri Malang, Jl. Semarang 5, Malang 65145, Indonesia *markus.diantoro.fmipa[at]um.ac.id b). Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Indonesia Abstract Thermoelectric is renewable energy that uses the principle of temperature difference which is converted into electrical energy. Thermoelectric materials are generally semiconductors that have high electrical conductivity, high Seebeck coefficient and low thermal conductivity. CuS material is used as a thermoelectric material because Cu has a high electrical conductivity and S has a low thermal conductivity so CuS material meets the requirements to be a thermoelectric material. However, because the seebeck coefficient of CuS material is relatively low, it is necessary to add Ni doping so that the Seebeck coefficient becomes large. Cu1-xNixS material was synthesized using the polyol method and made into a thin film. The polyol method was selected so that the Cu1-xNixS material is not oxidized. The Cu1-xNixS material (x = 0- 0.02- 0.04- 0.06- 0.08) was characterized by XRD test, SEM-EDX, I-V 4-point probe, and thermoelectric performance. XRD analysis inform that crystal sizes ranging from 19.98-22.69 nm, and the crystallinity of 34.36-37.77%. It is also shown that SEM image analysis give rise the grain had mostly in spherical and oval shapes with no agglomeration. The grain size ranged from 174.6 to 174.1 nm. The Seebeck coefficient is increase with the increase of Ni doping in the Cu1-xNixS, which is 2.62-7.3 x 10-4 V/K. Further more, it is obtained that electrical conductivity increase with increas of Ni. The electrical conductivity reach to 1.05-4.98 x 104 &#937--1 cm-1. Keywords: Ni, CuS, Thermoelectric, Polyol, conductivity, Seebeck Share Link | Plain Format | Corresponding Author (Reza Akbar Pahlevi)

38	Materials for energy	ABS-16
SYNTHESIS AND CHARCTERIZATION OF CuS-GO NANOCOMPOSITE AS THERMOELECTRIC MATERIAL Muhammad Syolahudin Abdurrhaman (1), Markus Diantoro (1,2,a), Reza Akbar Pahlevi (1), Alma Nur Roisatul Masruhah (1), Chusnana Insjaf Yogihati (1,2) department of physics, faculty of mathematic and science, state university of malang Abstract Energy needs are increasing but the availability of fossil-based energy is increasingly depleting. The use of conventional energy has caused many problems, both for health and the environment. Researchers are looking for alternative energy that is environmentally friendly and can replace the role of fossil energy. One potential candidate that can be an alternative energy is thermoelectric. Thermoelectric device functions to convert heat energy into electrical energy. CuS is one of the most excellent candidates for thermoelectric. In this study, the synthesized CuS were composited with graphene oxide. The composite method performed on this study is with doctor blade. The composites have been fabricated by variying GO concentrations, which are 0%, 5%, 10%, 15%, 20%. The slury composites were prepared using TEG and then deposited on Capton substrate using doctor blade. The samples were subsequently characterized using XRD, SEM, electrical conductivity and Seebeck coefficient measurement. It is obtained that CuS-GO with the largest concentration of 20% shows the largest Seebeck efficiency of 2737 &#956-V/K. Generally, the addition of GO to CuS-GO tend to increase the Seebeck coefficient. Keywords: Thermoelectric, Seebeck Coefficient, Electrical Conductivity, CuS, GO Share Link | Plain Format | Corresponding Author (Muhammad Syolahudin Abdurrahman)

39	Materials for energy	ABS-20
Analysis of the Effect of PEG 1000 on Synthesized Corn Cob Charcoal Kusuma Wardhani Mas^udah1, a), Darminto Darminto2, Ahmad Taufiq3,b), and Radissa Dzaky Issafira1 1Department of Mechanical Engineering, Faculty of Engineering, University of Pembangunan Nasional Veteran Jawa Timur, Indonesia. 2 Department of Physics, Faculty of Science and Data Analytics, Sepuluh Nopember Institute of Technology, Sukolilo, Surabaya, 60111, Indonesia dditional affiliations should be indicated by superscript numbers 2, 3, etc. as shown above. 3Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Indonesia. Abstract Abstract. Graphene, which is a single layer of carbon atoms packed into a two-dimensional (2D) honeycomb lattice, has been extensively investigated for applications in various fields. PEG 1000 polymer is added to the synthesis of Graphene Nanoparticles which aims to reduce and prevent the appearance of clumps between particles. Fine corncob powder without heating was mixed with 20 ml of PEG-1000 solution. Then stirred at a speed of 750 RPM for 1 hour. In this study, the characterization of the test material was carried out using XRD (X-ray Diffractometer), UV-Visible Spectrophotometer, Fourier Transform Infrared (FTIR), and SEM-EDX (Scanning Electron Microscopy-Energy Dispersive X-ray). XRD measurement starts from an angle of 100 - 600 with a step of 0.040. This XRD uses a Cu K-1 wavelength of 1.5046 A. The phase identification process is based on data matching using Search Match! software. Measurement with UV-Vis Spectrophotometer aims to determine the width of the energy band gap. Keywords: Corn Cobs, Template, Carbon, Morphology Share Link | Plain Format | Corresponding Author (Kusuma Wardhani Masudah)

40	Materials for energy	ABS-30
Construction of Thermoelectric to Maximize Energy Harvesting Dean Setyawan1), Markus Diantoro 1,2,a), Reza Akbar Pahlevi1), Muhammad Syolahudin Abdurrhaman1), Moh. Hafidhuddin Karim1), Chusnana Insjaf Yogihati 1,2), 1Department of Physics, Faculty of Mathematics, Universitas Negeri Malang, Jl. Semarang 5, Malang 65145, Indonesia 2Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Indonesia Abstract Since the lack and reducing fossil-based energy sresources, researches are extensively to seek the materials, methods and technology to overcome the problems. One of the proposlaas is implementing thermoelectric devices to convert heat energy into electrical energy. Conversion occurs because there is a temperature difference between the two thermoelectric sides. Thermoelectricity can be maximized by controlling the temperature on both sides. Energy conversion has a certain efficiency and the rest of energy becomes a wasted energy. Wasted energy is usually in the form of heat so we can use thermoelectric to utilize this energy. Thermoelectric energy conversion efficiency based on Seebeck coefficient. Although the thermoelectric technology has been implemented, research on thermoelectrics materials still expanding which tends to maximizing Seebeck coefficient of materials such as PbTe, SiGe, BiSbTe, and etc. It also possible to use doping to enhance Seebeck coefficient of relatively new CuS materials which leads to enhance figure of merit (ZT). To get the maximum potential for implementing thermoelectrics on the market, it is necessary to conduct research on the development of thermoelectric configurations. In this study, we present various constructions of thermoelectric devices with certain configurations consisting of more than 1 thermoelectric to compare each configuration based on which yield the highest energy conversion. We used a home made modified electronic equipment to explore the physical properties of various configurations. Keywords: Thermoelectric, Configuration, Conversion, seebeck Share Link | Plain Format | Corresponding Author (Dean Setyawan)

41	Materials for energy	ABS-32
The Effect of Pressure and Size on Sprayer ZnO Nanoflower for Photo-supercapacitor Performance Optimization as Harvesting and Energy Storage Media Rifatu Nuril Laily (1), Santi Nanda Putri (1), Nurdin Khoirurizka (2), Markus Diantoro (*1) 1) Department of Physics, Faculty of Mathematics and Sciences, Universitas Negeri Malang. Jl. Semarang No. 5, Malang, 65145, Indonesia *markus.diantoro.fmipa[at]um.ac.id 2) Department of Electrical Engineering Education, Faculty of Engineering, Universitas Negeri Malang. Jl. Semarang No. 5, Malang, 65145, Indonesia Abstract Structure nanoflower technique spray coating has been successfully carried out. ZnO nanoflower is able to improve the performance of photo-supercapacitor, because it is more effective in light absorption. In this study, DSSC (Dye-Sensitized Solar Cell) was fabricated from ZnO nanoflower using a spray coating combined with TiO2 as a photoanode, while the supercapacitor was fabricated from BaTiO3. Variations in pressure and size of spray coating are used to determine their effect on photo-supercapacitor performance. The results of XRD analysis showed that the greater the pressure and the size of the spray greater the crystallinity and the size of the crystal particles. The results of SEM analysis showed that the ZnO nanoflower formed at a pressure of 5 bar with the highest porosity of 57.80%. The effect of pressure and spray ZnO nanoflower on photo-supercapacitor performance was investigated by UV-vis characterization. In addition, by using the solar simulator test, the DSSC efficiency of 7.02% was obtained. Supercapacitors that function as energy stores in photosupercapacitors.test charge discharge show that the supercapacitor has a specific capacitance of 29.20 F/g. Technique spray coating succeeded in forming ZnO nanoflower and increasing the photo-supercapacitor performance. Keywords: DSSC- Photo-supercapacitor- Spray pressure- Spray size- ZnO nanoflower Share Link | Plain Format | Corresponding Author (RIFATU NURIL LAILY)

42	Materials for energy	ABS-34
Investigation of large-scale Dye Sensitized Solar Cell using TiO2 mesoporous structure Nabella Sholeha1,a) Nadiya Ayu Astarini1,b), and Herlin Pujiarti1, 2,c) 1Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No. 5, Malang 65145, Indonesia. 2Center of Advanced Materials and Renewable Energy, Universitas Negeri Malang, Jl. Semarang No. 5, Malang 65145, Indonesia. a)nabellash98[at]gmail.com b)nadiyaayu24[at]gmail.com c) Corresponding author: herlin.pujiarti.fmipa[at]um.ac.id Abstract Titanium is a metal oxide compound commonly used as a DSSC material. This study describes the support of photovoltaic parameters for the active area of TiO2-based DSSC photoanodes. The photoanode layer on the DSSC was deposited using a simple method, namely screen printing. The counter electrode used is Pt which is deposited on the FTO. Electrochemical impedance (EIS) spectroscopy curve measurements, current voltage (I-V), and photoresponse (V-t) were used as characterization methods. DSSC cells were tested for three variations area of 0.25- 2.00- and 3.00 cm2. It was observed that the photovoltaic parameters, short circuit current density (JSC), open circuit voltage (VOC), fill factor (FF), and power conversion efficiency (&#951-), decreased in line with the increasing of active area. All DSSC samples with dimensional variations of active area and mesoporous paste materials have a good response to the light. Keywords: DSSC- photoanode active dimensions- TiO2-based- photovoltaic performance. Share Link | Plain Format | Corresponding Author (Nabella Sholeha)

43	Materials for energy	ABS-35
The Effect of Activation Temperature of Coal Carbon on Its Electrochemical Performance as Symmetric Supercapacitors Markus Diantoro, Rizka Ramadhani Maisyarah, Ishmah Luthfiyah State University of Malang Abstract Supercapacitors are gaining much attention as electrochemical energy storage for their fast charging rates, high power density, good cycle performance, quicker charge-discharge, longer device life, and abundant materials. According to the storage mechanism, supercapacitors are divided into 3 types- EDLC (Electric Double Layer Capacitor), pseudocapacitor, and hybrid. Activated carbon is an excellent candidate as the primary material for making EDLC supercapacitors, and coal is one of the best precursor materials. The synthesis of activated carbon can be done by chemical and physical activation, where KOH and ZnCl2 are often widely used. However, several researchers have studied the manufacture of activated carbon using ZnCl2 activators, still using a method that is quite long and complicated, which involves nitric acid, pyrolysis, inert gas, or high concentrations of ZnCl2. Therefore we do research on the synthesis of activated carbon with ZnCl2 activator in a more straightforward way but produces good electrochemical performance. This research focuses on synthesizing activated carbon from coal using a ZnCl2 activator with different temperature variations at room temperature, 500, 800, and 1100oC. Briefly, the experiment begins with synthesizing coal-activated carbon with temperature variations. Then, the powder obtained is used as the primary material for making electrodes and deposited on nickel foam. Furthermore, the electrodes are arranged with the separator and electrolyte into a coin cell device for electrochemical characteristics to be carried out. The electrochemical measurements include Cyclic Voltammetry (CV), Charge-Discharge (CD), and Electrochemical Impedance Spectroscopy (EIS) using the Gamry potentiostat and Battery Testing Equipment instruments. Keywords: Coal, Activation Temperature, Symmetric Supercapacitor, Electrochemical Performance Share Link | Plain Format | Corresponding Author (Rizka Ramadhani Maisyarah)

44	Materials for energy	ABS-38
Construction of Piezoelectric Energy Harvesting Using Full Pressure Transducer Agung Saputro1), Markus Diantoro 1,2,a), Moh. Hafidhuddin Karim1), Reza Akbar Pahlevi1), Herlin Pujiarti1,2), Nandang Mufti1,2), a) Universitas Negeri Malang Jl. Semarang No.5, Sumbersari, Kec. Lokowaru, Kota Malang, Jawa Timur 65145 Indonesia b) Departemen Fisika FMIPA UM Jl. Simpang Bogor No.19, Sumbersari, Kec. Lokowaru, Kota Malang, Jawa Timur 65145 Indonesia Abstract A piezoelectric is a device that converts pressure into electric energy. The size of the piezoelectric efficiency value is determined by the magnitude of the output power generated by the piezoelectric module. In this study, the piezoelectric used as a performance test was a commercial piezo-electric, type Piezo Element, MCFT-27T-4.2A1-126. The method of data collection is done by creating single circuit, series, parallel, and combined variations. The number used in series, parallel, and combined variations is 8 pieces. Parallel and combined constructions of commercial piezoelectric devices tested using hand-made tools should be equipped with a full set of aligners as well as resistors to avoid power loss and reverse current optimization back as output. This series uses 8 Piezo Element pieces, type MCFT-27T-4.2A1-126 (PZT). The parallel series is the most optimal voltage output generator of 42,57 V (16 N) compared to other samples. on the other hand, the combined series 1 is the output producer of current and maximum power consecutive of 94.86 &#956-A and 1.347,01 &#956-W. (12 N). Keywords: Piezoelectric, Force, Electric, Hand-made tools Share Link | Plain Format | Corresponding Author (AGUNG SAPUTRO)

45	Materials for energy	ABS-50
Organic Dye for Best Performance of DSSC in ZnO Nanorod Structure: A Mini Review Adisria Marise Afianti1) , Herlin Pujiarti1, 2, a), Nadiya Ayu Astarini1), Anjar Nur Ramadhani1), Nabila Hari Arimbi1) and Markus Diantoro1, 2) 1 Department of Physics , Faculty of Mathematics, State University of Malang, Jl. Semarang 5, Malang 65145, Indonesia. 2 Center of Advanced Materials for Renewable Energy, State University of Malang, Indonesia. Abstract Dye-Sensitized Solar Cell (DSSC) is a device that converts sunlight energy into electrical energy that has a higher efficiency than the previous generation with the use of dyes. Photoanode as a component in the DSSC system plays a role in the absorption of molecules with high surface area and electron conductors excited by dyes. The photoanode semiconductor material that is often used is Zinc Oxide (ZnO) which has several advantages including low price, easy of synthesis, and high electron mobility is attracting attention because it has a piezo-tronic effect and a piezo-phototronic effect that can modulate migration and separate charge carriers which enhances photocatalytic performance. The effect of hexagonal wurtzite structure, height, diameter, porosity of ZnO nanorod has the potential to improve the performance of DSSC. ZnO has characteristics suitable for the sensitization of organic dyes, rather than metal dyes because absorption is increased by the presence of electron donors in metal-free organic dyes. Organic dye exhibit interesting spectral characteristics and electrochemical mechanisms through the contribution of molecular precision to ZnO nanorods photoanode. High porosity affects the increase in dye absorption and a low energy gap to increase the electron excitation rate. The absorption enhancement and optimized energy gap of the ZnO nanorod structure with organic dyes enhance the performance of DSSC. Therefore, in this paper, the best photovoltaic performance is studied in more detail to determine the effect of organic dyes on the performance of ZnO nanorod-based DSSC Keywords: Organic dye, ZnO nanorod, DSSC Share Link | Plain Format | Corresponding Author (Adisria Marise Afianti)

46	Materials for energy	ABS-58
Comparison of Flexible Piezoelectric NRs/Cu and NFs/Cu as Energy Harvesting Dhea Paradita1,b), Nandang Mufti1,2,a), Atika Dewi Puspita Sari1,a), Saparullah1,a), Aripriharta3,b), Sunaryono1ubmit This Sample Abstract 1Physics Department, Faculty of Natural Science and Mathematics, Universitas Negeri Malang Jl. Semarang 5 Malang, 65145 2Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia 3Electrical Engineering, Faculty of Engineering, Universitas Negeri Malang Jl. Semarang 5 Malang, 65145 Abstract Energy harvesting from the environment has become a promising technology. One of the most abundant energy is mechanical energy. Because of its wide availability and high energy density, it can be used as a nanogenerator. The active material with piezoelectric properties can convert mechanical vibration into electrical energy. This article reports the piezoelectric performance of nanogenerators as energy harvesters depending on the layer method. The nanogenerator was successfully fabricated on flexible ITO/PET substrate. This study compares the piezoelectric nanogenerator performance based on piezoelectric Nanorods(NRs)/Cu and piezoelectric Nanofibers(NFs)/Cu. The piezoelectric Nanorods were synthesized using the hydrothermal method at 95 &#8451-, while the piezoelectric NFs synthesized using the electrospinning method. Then piezoelectric NRs and piezoelectric NFs were sputtered with Cu using the DC Magnetron Sputtering method. Cu as the electrode of the substrate layer piezoelectric NRs and piezoelectric NFs. Piezoelectric NRs/Cu was characterized using X-Ray Diffraction (XRD), scanning electron microscopy (SEM), and UV-Vis Spectrometer. The performance of the nanogenerator was characterized using Keithley type 6517B assembled with a rectifier diode. The function of the rectifier diode is to convert the output current of the nanogenerator from Alternating Current (AC) to Direct Current (DC). 1.9 &#956-m long of ZnO nanorods were grown hexagonally, and the NFs have length of 3.25 &#956-m, in addition, the band gap energies of NRs/Cu and NFs/Cu are 2.98 eV, and 3.22 eV. Meanwhile, NRs/Cu and NFs/Cu output are 2.41 mWatt and 3.36 mWatt. Based on performance, Piezoelectric NRs/Cu have higher performance than piezoelectric NFs/Cu. Keywords: Energy Harvesting, Nanorods, Nanofibers, Nanogenerator, Piezoelectric. Share Link | Plain Format | Corresponding Author (Dhea Paradita)

47	Materials for energy	ABS-63
Identifying Ion Migrations at the Perovskite/Transport layer Interface by IMVS Measurements Adhita Asma Nurunnizar (a), Natalita Maulani Nursam (b), Herman (c) and Rahmat Hidayat (*d) a, c, d) Physics of Magnetism and Photonics Research Division, Faculty of Mathematics and Natural Sciences, Bandung Institute of Technology, Jalan Ganesha 10 Bandung 40132, West Java, Indonesia *rahmat[at]fi.itb.ac.id b) National Research and Innovation Agency, Jalan Sangkuriang Komplek LIPI, Bandung 40135, West Java, Indonesia Abstract Organic-inorganic hybrid perovskite solar cells (PSCs) show the rapid progress in just a few years with some promising properties for photovoltaic applications, such as large absorption coefficients, excellent carrier mobility, long charge carrier diffusion length, tunable bandgap, and low cost. The development of PSCs is focused on two crucial issues, power conversion efficiency (PCE) and stability. However, the low-temperature solution process caused perovskite crystals without enough thermal relaxation to obtain non-equilibrium thermodynamic leading to lattice mismatches and vacancies defects of perovskite crystals. Ion migration, oxygen, light, moisture and thermal may also cause crystal defects. These defects cause poor performance and low long-term stability of PSCs. Herein, we present investigation results on several PSCs having different cell performances, which were suggested to be caused by the presence of excess unpaired ions at the surface of perovskite grain boundaries or interfaces, by simple measurements of intensity-modulated photovoltage spectroscopy (IMVS). The absorbance spectra of all perovskite layers indicate strong absorption in the visible light region with the same absorption onsets at ~780 nm. These results may indicate that the different performance of cells is not related to bulk characteristics but is rather attributed by the interfacial characteristics. We suggest the high-frequency response in IMVS is related to electronic charge transport and recombination at the electrode/active layer, i.e. TiO2/perovskite, whereas the low-frequency response may be related to ion migrations accumulated at the surface of perovskite grain boundaries or interface. The shortest time constant in low-frequency response indicating the largest and fastest ion migrations. Therefore, we may suppose that more excess unpaired ions are present at grain boundaries or interface, which then affects the entire transport electron. In such a case, subsequent electron trapping may cause a delay in the rise part of the transient photovoltage (TPV) curve. Both IMVS and TPV data of poor cell performance then suggest that ion migration may also affect the entire electron transport in the fast time regime before the electrons reach the outer electrode layers. Keywords: perovskite solar cells- surface states- trap states- recombination loss- ion migration- intensity modulated photovoltage Share Link | Plain Format | Corresponding Author (Adhita Asma Nurunnizar)

48	Materials for energy	ABS-70
ANALYSIS OF THERMAL AND MECHANICAL QUALITY BRICKETS FOR ARBIC COFFEE AND RICE HUSK 1)Indri Winarti, 2)Rizky Safarina Khoirunisa, 3)Hasniah Aliah, 4)Ridwan Ramdhani, 5)Asti Sawitri, 6)Ryan Nur Iman dan 7)Andhi Setiawan 1,2,3,4 Departement of physics, State Islamic University, Sunan Gunung Djati, Bandung, Indonesia 5 Departement of physics, Halim Sanusi University, Bandung, Indonesia 7 Departement of physics, Indonesia University of Education, Bandung, Indonesia 6 Department of Physics, College of Engineering and Physics, King Fahd University of Petroleum and Minerals, Dhahran, Kingdom of Saudi Arabia Abstract Coal in the form of briquettes is one source of energy that can be used as fuel, but the side effect produced from coal in the form of briquettes is that the carbon content of coal is high enough so that the action of carbon substances causes air pollution, therefore it is necessary to renew One of the sources of energy is the manufacture of charcoal briquettes with agricultural, plantation and livestock waste. Coffee husk and rice husk waste is one of the biomass materials that has not been used optimally. The waste also has the content needed in the manufacture of biomass briquette charcoal, namely the content of cellulose, hemicellulose and lignin, where the content of coffee husks is cellulose 19-20%, hemicellulose 24-45% and lignin 18-30% for rice husk, namely cellulose 48 ,3%, hemicellulose 31, 6% and lignin 24.6%. The adhesive used is tapioca flour because tapioca flour contains amylose and amylopectin, these contents are the main ingredients that need to be owned by the material to be used as briquette adhesive. The purpose of this study was to determine the quality of the charcoal briquette mixture of coffee husks and rice husks, to determine the effect of particle size and composition of the mixture of coffee husks and rice husks. The method used in this study is carbonization at a temperature of 400o C for 60 minutes, the variations used are variations in particle sizes of 60, 80 and 100 mesh, variations in the composition of Coffee Peel (KK): Rice Husk (SP) (100%: 0%, 75%:25%, 50%:50%, 25%:75%, 0%:100%) and 7% tapioca adhesive. In this study will produce the value of density, rate of combustion, moisture content, volatile matter content, ash content. Keywords: Keywords: briquettes, rice husks, coffee husks, carbonization, mesh Share Link | Plain Format | Corresponding Author (Rizky safarina Khoirunisa)

49	Materials for energy	ABS-88
Analysis of Structural and Optical Properties of S-doped ZnO Thin Films for Optoelectronic Device Applications Yolanda Rati1, a), Febriman Zendrato1, b), Rachmat Waluyo1, c), Riri Jonuarti 2, d), Robi Kurniawan3, e), Yudi Darma1, f) 1Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Ganesha 10, Bandung 40132, Indonesia. 2Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang, Jalan Prof. Dr. Hamka Air Tawar Barat, Padang, 25171, Indonesia 3Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No.5, East Java 65145, Indonesia. Abstract We study the effect of S dopant on the structural and optical properties of ZnO thin films. One-dimensional ZnO with sulphur dopant was synthesized using the hydrothermal method on FTO substrates. The concentration of S dopant from sodium sulphide was examined at 1 mM (ZnO-S1) and 5 mM (ZnO-S5). FESEM images exhibit rods-shaped with the highest density at ZnO-S1. The XRD pattern revealed a high hexagonal structure that is the dominant grown (002) plane in the c-axis. The band gap energy of ZnO thin films reduces by adding the concentration of S dopant from 3.18 eV to 3.09 eV. Supporting the experimental results, the density functional theory shows that the enhancement of S concentration modifies the bandgap contributed by the S 3p orbital. The existence of S dopant in ZnO thin films has the application development in the next generation of optoelectronic devices. Keywords: ZnO- sulphur- structure- optical- density functional theory Share Link | Plain Format | Corresponding Author (Yolanda Rati)

50	Materials for energy	ABS-91
Structural modification and electronic respons of ZnO thin film during sputtering deposition and post-thermal annealing for solar cell application Yasni Novi Hendri, Jessie Manopo, Yolanda Rati, Riri Jonuarti, Robi Kurniawan, and Yudi Darma 1Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Ganesha 10, Bandung 40132, Indonesia 2Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Padang, Jalan Prof. Dr. Hamka Air Tawar Barat, Padang, 25171, Indonesia 3Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No.5, East Java 65145, Indonesia Abstract We study the role of thermal annealing on structural modification and electronic properties of ZnO nanostructure on silicon (100) substrates. The ZnO is fabricated using dc-unbalanced magnetron sputtering (DC-UBMS) by controlling deposition parameters, ie time and power. The thickness of the ZnO increases when applied the deposition power from 4.5W to 12W. Thermal annealing of 600C and 800C for 10 mins was introduced to modify the nanostructure of ZnO from cone-like shape to become rod-shape arrays. The increase of thermal annealing leads to the structural evolution accompanied by decreasing in length of rod-shape from 850nm to 300nm. All samples show the wurtzite structure with dominant crystal orientation in (002) direction. We also found that the thermal annealing promotes the increase in lattice strain. From the absorbance spectra, the thermal annealing increased Eg of ZnO nanostructure (3.28-3.33 eV). Supporting the experimental results, first-principle study of ZnO system employed GGA + U treatment shows that the behavior of band structures and partial density contributed by hybridization of O 2p and Zn 3d states. This study provides a new understanding of the structural evolution and dynamic of electronic behavior on ZnO nanorods, which is the essential key in the controlling the energy conversion efficiency of solar cell application. Keywords: deposition parameter- ZnO nanostructure- annealing treatment- DFT Share Link | Plain Format | Corresponding Author (Yasni Novi Hendri)

51	Materials for energy	ABS-92
Dye-sensitized solar cell (DSSC) utilizing reduced graphene oxide (rGO) films counter electrode: effect of reduced graphene oxide (rGO) thickness Herlin Pujiarti 1, 2, a), Akhmad Al Ittikhad1, 2, b) , Fitrilawati3, c), Rahmat Hidayat4, d) 1Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No. 5, Malang,Indonesia, 65145. 2Center of Advanced Materials and Renewable Energy, Universitas Negeri Malang, Jl. Semarang No. 5, Malang, Indonesia, 65145 3Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Padjadjaran, Jl. Raya Jatinangor Km 21 Sumedang, 45363 4Department of Physics, Faculty of Mathematics and Natural Sciences, Institut Teknologi Bandung, Jl. Ganesha 10, Bandung 40132 Abstract Research on Dye-Sensitized Solar Cells (DSSC) continues to increase, especially the photoanode and counter electrode. As is well known, the counter electrode has an important role in the process of transporting electrons from the electrode substrate to the electrolyte and effectively catalyzing the iodide/triiodide (I-/I3-) redox reaction. Counter electrode materials are often used namely Pt, rGO, and Ni. Pt is a counter electrode material that is often used because it can produce high efficiency. However, for the long-term stability, cost-effective construction, rarity, and susceptibility to iodine electrolyte corrosion, rGO is superior to Pt. In this study, GO precursor was prepared to produce a counter electrode layer of Reduced Graphene Oxide (rGO) by UV Oven Spraying and photoreduction method. rGO was synthesized on an FTO substrate with the number of rGO layer variations, namely 20, 40, 80, and 100 layers. Characterization was used XRD, SEM, I-V, and Photocurrent. The XRD pattern confirmed a pure rGO phase. The morphology of rGO were identified through SEM characterization. The characteristics of J-V show DSSC performance parameters, namely Jsc, Voc, FF, and &#951-. The electron transport mechanism of DSSC was identified through photoresponse. Counter Electrode DSSC based on rGO exhibited the highest efficiency of 3.50% at 100 times rGO coating with Jsc, Voc, and FF of 19.26, 0.59, and 0.31 respectively. Keywords: Dye-sensitized solar cell, counter electrode, rGO thickness, photoreduction. Share Link | Plain Format | Corresponding Author (Akhmad Al Ittikhad)

52	Materials for energy	ABS-93
Early Oxidation investigation of ODS Fe20Cr5AlTiY at 800oC with the addition of Y2O3 and different heat treatment process Defta Sandyaning Lintang (a*), Masruroh (a), Toto Sudiro (b), Ahmad Afandi(b*) (a) Department of Physic Brawijaya University *deftasandyaning[at]student.ub.ac.id (b) Research Center for Advanced Materials National Research and Innovation Agency (BRIN) *ahmad.afandi[at]brin.go.id Abstract oxide dispersion strengthened (ODS) steels has been developed for the structural material of nuclear power plants, and the progress of the development has been significant in the past two decades. The presence of the dispersed fine oxide particles is proven to be effective to hinder the dislocation motion which eventually improve the creep properties. Presently, the ODS steels are designed for operational temperature at 800C, which is high enough to induce major oxidation problem. In this research, Y2O3 and Titanium was mechanically alloyed for 24h, and the total amount of 2.5 wt% of those oxides were mixed with Fe20Cr5AlTiY ODS alloy. The compaction or densification was conducted by Spark Plasma Sintering (SPS) process at 1000C, under vacuum condition. The sample with 3 cm diameter was obtained, and subsequently wire cut, for the further heat treatment at 1200C followed by aging at 700C, respectively. The samples underwent the oxidation test at 800C for 100h, and the result was compared with Fe20Cr5AlTiY ODS alloy. The result indicated that ODS alloy has superior oxidation resistant, due to formation of the Cr2O3 oxide. Meanwhile the samples with 0.25 wt% Y2O3 and Ti addition showed formation of Al2O3 oxide, hence the mass gains is higher. The results are discussed with the detail XRD and SEM EDS analysis. Keywords: ODS Steels, oxide nano particles, spark plasma sintering, oxidation Share Link | Plain Format | Corresponding Author (Defta Sandyaning Lintang)

53	Materials for energy	ABS-95
Effect of Different Ni/S Concentration on the Supercapacitor Properties of Activated Carbon/NiS Electrode Memoria Rosi, Irfan Afandi Syamsudin, Indra Wahyudhin Fathona, and Abrar Ismardi Department of Engineering Physics, School of Electrical Engineering, Telkom University Corresponding author: memoriarosi[at]telkomuniversity.ac.id Abstract This study reports on the manufacture of supercapacitor electrodes based on a composite of the activated carbon/NiS. Activated carbon is often used as an active material for ionic storage due to its nanoporous structure and high surface area. However, the activated carbon has a low specific capacitance which is limited by the Electric Double Layer Capacitor/EDLC principle. Here, we introduce the NiS as a faradic redox agent to improve the specific capacitance of the activated carbon supercapacitor through the pseudo capacitor mechanism. The Ni/S concentration varied from 10:1, 1:1, and 1:10. To make the composite activated carbon/NiS, the activated carbon was firstly prepared on the nickel foam as a current electrode, and then the NiS was electrodeposited using the produced activated carbon electrode as the working electrode, platinum as counter electrode and Ag/AgCl as a reference electrode. The electrodeposition voltage was applied from -1.2V to 0.2 V with a scan rate of 5mV/s. The activated carbon/NiS electrodes were evaluated using Scanning Electron Microscopy/Energy Dispersive X-ray Spectroscopy (SEM/EDX), cyclic voltammetry (CV), Galvanostat Charge-Discharge (GCD), and Electrochemical Impedance Spectroscopy (EIS). Keywords: NiS, activated carbon- electrodeposition- specific capacitance- supercapacitor- EDLC, pseudo capacitor Share Link | Plain Format | Corresponding Author (Memoria Rosi)

54	Materials for energy	ABS-97
Effect of Additive CMC/PVA on Cellulose Membrane as a Base Material for Solid Polymer Electrolyte Li-Ion Battery Qolby Sabrina (a*), Hilwa Kamilah (b), Titik Lestariningsih (a), Christin Rina Ratri (a), and Sitti Ahmiatri Saptari (b) a) Research Center for Advanced Materials, National Research and Innovation Agency - BRIN, Puspiptek Serpong, Tangerang Selatan, Banten 15314, Indonesia. *qolby.sabrina[at]brin.go.id b) Department of Physics, Faculty of Science and Technology, Universitas Islam Negeri Syarif Hidayatullah, Jakarta 15412, Indonesia Abstract Solid polymer electrolyte (SPE) with high ionic conductivity, more porous, and stable electrochemical characteristics have great importance to the application in Li-ion batteries. In this study, SPE membrane-based cellulose with the addition of lithium bis(oxalato)borate (LiBOB) salt, ionic liquid (IL), and variations of the carboxymethyl cellulose (CMC) and polyvinyl alcohol (PVA) additives made by the solution casting and freeze-thawing method. The XRD characterization showed that the addition of additives had not succeeded in reducing the degree of crystallinity of SPE membrane, so the conductivity value decreased with additives. The highest ionic conductivity value obtained by the membrane without additives is 0.53 x 10-5 S/cm by EIS test. From the FE-SEM characterization, it was found that additives CMC in this study reduced the pore diameter, and additives PVA at membranes hydrogel made fewer pores and seemed like covered with a membrane. The CV test in the form of a quasi-reversible on the SPE membrane indicate that with further improvements this SPE system can be a candidate for Li-ion battery applications. Further research is needed on the optimization of the number of additives used to reduce the degree of crystallinity of the SPE membrane to improve the conductivity value. Keywords: CCMC- PVA- Cellulose- Li-ion battery- Solid polymer electrolyte Share Link | Plain Format | Corresponding Author (Qolby Sabrina)

55	Materials for energy	ABS-103
Optical Properties of Bio-Pigments from Moringa Oleifera Lam, Ipomea Reptans Poir, in Dye-Sensitized Solar Cells Edy Supriyanto1, Firman Wahidi1, Novita Andarini2, Henry Ayu Kartikasari1, Nova Alviati1, Ahmad Taufiq3 and Agus Subekti1 1) Department of Physics, Faculty of Mathematics and Natural Sciences, Jember University, Kalimantan Street 37, Jember 68121, Indonesia 2) Department of Chemistry, Faculty of Mathematics and Natural Sciences, University of Jember, Kalimantan Street 37, Jember 68121, Indonesia 3) Department of Physics, Faculty of Mathematics and Natural Sciences, Malang State University, Semarang Street 5, Malang 65145, Indonesia Author Emails edysupriyanto[at]unej.ac.id Abstract PBiological pigments are under investigation for dye-sensitized solar cells (DSSC) to increase their performance and affordability. Optical properties, including the absorbance and range of absorption spectrum, are among the characteristics that determine the suitability of a dye for DSSC. This study compares the use of pH conditions in the preparation of new bio-pigments that may improve DSSC performance. Optical analysis was carried out on Moringa Oleifera Lam, Ipomea reptans Poir, Averrhoa bilimbi Linn, and Tamarindus Indica fruit extracts at acidified to a pH range of 1-6 (Moringa Oleifera Lam dyes and Ipomea reptans Poir) and 1-2.6 (Averrhoa bilimbi Linn and Tamarindus Indica fruit) using sulfuric and formic acid. Absorbance data and light absorption spectra were characterized using UV-Vis spectroscopy. We observed that extracts of Moringa oleifera Lam and Ipomea reptans Poir, which contain chlorophyll-b, have the same absorbance spectra (range, 400-500 nm). Tannins are the light-major absorbing compounds in Averrhoa bilimbi Linn, and chalcone is the major light-absorbing compound in Tamarindus Indica. The addition of sulfuric acid to these extracts causes a decrease in absorbance without changing the absorption range. In contrast, the addition of formic acid changes the absorbance and widens the absorption range to the near-infrared region due to chemical changes in the solvent. Keywords: Optical properties: Bio-pigment: UV-VIS spectroscopy:Sulfuric acid- Formic acid Share Link | Plain Format | Corresponding Author (Edy Supriyanto)

56	Materials for health	ABS-14
Development of Magnesium Phosphate Coating Formed by Plasma Electrolytic Oxidation at a High Current density of DC Mode on AZ31 Magnesium Alloy Anawati Anawati and Efrina Hidayati Departemen Fisika, FMIPA, Universitas Indonesia, Depok 16424, Indonesia Abstract The coating structure formed by plasma electrolytic oxidation (PEO) on a metallic substrate depends on the applied current density. In this work, magnesium phosphate coating is developed on magnesium (Mg) alloy AZ31 in DC mode at an extremely high current density of 1000 A/m2. The PEO treatment was performed in sodium phosphate electrolyte at 25degC, and the process was terminated at 1 and 5 min. The coating structure and elemental composition were investigated using a scanning electron microscope (SEM) and energy dispersive x ray spectroscopy (EDS). The crystalline phases in the coating were analyzed by an x ray diffractometer (XRD). Electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization (PDP) tests were conducted in 3.5 wt NaCl solution at 30C. The mechanism of coating formation is discussed in detail in the paper. The resulting coating was composed of amorphous and crystalline magnesium phosphate with an average thickness of 53 micro m, regardless of formation time. More crystalline phase was formed with processing time. The coating was initially highly porous and became significantly denser at prolonged processing time. Densification of coating enhanced the corrosion resistance of the specimen. Keywords: coating- plasma electrolytic oxidation- magnesium- current- corrosion Share Link | Plain Format | Corresponding Author (anawati anawati)

57	Materials for health	ABS-23
Characterization of Hydroxyapatite Scaffold From Limestone Using Gas Foaming Method Fikri Addin Salimy, and Yusril Yusuf Departement of Physics, Faculty of Mathematics and Natural Science, Universitas Gajah Mada, Yogyakarta, Indonesia Abstract Abstract is submitted as file Keywords: hydroxyapatite- scaffold, characterization- limestone- porosity Share Link | Plain Format | Corresponding Author (fikri addin salimy)

58	Materials for health	ABS-29
Synthesis and Characterization of Silver/Ti-Ferrite Nanocomposite for Drug Delivery Agent Illa Aminatul Azizah, Ahmad Taufiq*, Joko Utomo, Sunaryono, Arif Hidayat, Nandang Mufti, ST. Ulfawanti Intan Subadra Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang Abstract In this research, silver/Ti-ferrite nanocomposite has been successfully synthesized from Indonesian natural iron sand for the drug delivery agent. Silver nanoparticle was synthesized using reduction method and synthesis of Ti-ferrite used co-precipitation method with a soft template. The samples were characterized by XRD, FTIR, and SEM to determine the structure, functional groups, and morphology, respectively. Meanwhile, drug delivery performance was characterized by UV-Vis. The XRD pattern presented the spinel cubic for Ti-ferrite nanoparticle with the highest diffraction peak at 2-theta of 35.6o, and face center cubic for silver nanoparticle at 2-theta of 38.18o. The FTIR spectrum confirmed the presence of Ti-ferrite at wavenumbers of 418 cm-1 and 669 cm-1 for Fe-O, and 518 cm-1 for Ti-O. The SEM image showed that the morphology of silver/Ti-ferrite nanocomposite had a particle size distribution of 40.1 nm. Furthermore, UV-Vis data analysis showed the doxorubicin peaks found at wavelengths of 233, 255, 296, and 497 nm. Based on drug loading and drug release analysis, the silver/Ti-ferrite nanocomposite has the potential to be applied as drug delivery agent with a high release of 83%. Keywords: Iron sand, nanocomposite, silver/Ti-ferrite, drug loading, drug release Share Link | Plain Format | Corresponding Author (Illa Aminatul Azizah)

59	Materials for health	ABS-37
Fabrication of HAp/Zn-Ferrite Nanocomposite for Drug Delivery Application Fauziyatul Iffah, Ahmad Taufiq*, Herlin Pujiarti, Nasikhudin, ST. Ulfawanti Intan Subadra, Arif Hidayat, Markus Diantoro Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5, Malang, 65145, Indonesia Abstract The aim of this study was to fabricate an HAp/Zn-ferrite nanocomposite for drug delivery application. The HAp/Zn-ferrite nanocomposite was synthesized using the coprecipitation method. The nanocomposite obtained was then characterized using XRD, SEM, and FTIR. Meanwhile, the drug delivery performance of the synthesized nanocomposite was characterized with UV-Vis. The result of XRD data analysis showed that the HAp phase had a crystallite size of 10.0 nm with a hexagonal crystal system. The presence of a Zn-ferrite was detected with a cubic spinel system with a crystallite size of 13.4 nm. The results of the FTIR analysis showed that the presence of the HAp phase was indicated by the presence of PO43-, CO32- and O-H groups. Meanwhile, the Zn-ferrite phase was indicated by Fe-O and Zn-O vibrations. The surfactant element was detected by the vibrations of CH2, COO-, C-C, and O-H groups. Based on the SEM image, it was known that the aggregated particle size was 60 nm with spherical morphology in the form of granular. The result of the UV-Vis data analysis showed that the nanocomposite had the ability to load doxorubicin with a capacity of 27.61 mg/g and the ability to release doxorubicin, which was relatively stable, reaching 79.15% in 300 minutes. Keywords: HAp/Zn-ferrite, nanocomposite, drug delivery agent, cubic spinel system, aggregated particle. Share Link | Plain Format | Corresponding Author (Fauziyatul Iffah)

60	Materials for health	ABS-62
Optimizing Sintering Temperature of Mg-1Zn-2.9Y Alloy Prepared by Powder Metallurgy Franciska Pramuji Lestari1, 2), Ariadne L. Juwono1), Anawati Anawati1, a), Ika Kartika2) 1) Departmen Fisika, FMIPA, Universitas Indonesia, Depok 16424, Indonesia 2) Research Center for Metallurgy, National Research and Innovation Agency (BRIN), Tangerang Selatan 15314, Indonesia a) Corresponding author: anawati[at]sci.ui.ac.id Abstract Keywords: magnesium alloy, conventional sintering, microstructure, corrosion Share Link | Plain Format | Corresponding Author (Franciska Pramuji Lestari)

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