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1	Catalyst and photocatalyst	ABS-48
Investigations of Annealing Temperature on Crystal Structure, Morphology, Optical Characteristic and Photocatalytic Activity of TiO2/Zn0,4Ni0,6Fe2O4 Nanocomposites for Liquid Waste Treatment Applications of Textile Dyes (Rhodamine B) Khorifathul Khoiriyah, Arisma Nurul Fauziyah, Vindy Yurike Oktavia, Ahmad Taufiq and Joko Utomo* Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5 Malang 65145, Indonesia *joko.utomo.fmipa[at]um.ac.id Abstract The composite nanoparticles TiO2/Zn0,4Ni0,6Fe2O4 had been synthesized using the Co-precipitation method with the annealing temperature of 200, 400, 600, 800 and 1000C for three hours. The synthesized samples were characterized using XRD, TEM, FTIR, UV-Vis and tested for their photocatalyst activities. The crystal structure of the TiO2/Zn0,4Ni0,6Fe2O4 nanocomposite shows TiO2 with anatase structure (a=b=3.79A - dan c=9.50A), whereas the rutile phase begins to form when the temperature reaches >600C. In addition increasing the annealing temperature causes the increase of crystal size from 9 nm at annealing temperature of 200C-. The morphology of the TiO2/Zn0,4Ni0,6Fe2O4 showed oval-shaped nanoparticles with a range of particle size from 46.32- 84.52 nm with the upward trend by giving annealing temperature. The value of energy band gap of the TiO2/Zn0,4Ni0,6Fe2O4 nanocomposite at 200, 400, 600, 800 and 1000C were 2.64, 3.04, 2.88, 2.62, and 3.03 eV, respectively. Meanwhile the highest percentage (%) of degradation was 43,23% for 120 minutes using the TiO2/Zn0,4Ni0,6Fe2O4 nanoparticles which was annealed at 200C. It was due to the smallest crystal size and a relatively small energy band gap obtained. Keywords: The composite nanoparticles TiO2/Zn0,4Ni0,6Fe2O4- annealing temperature- coprecipitation- photocatalyst- Rhodamine B Share Link | Plain Format | Corresponding Author (Khorifathul Khoiriyah)

2	Catalyst and photocatalyst	ABS-51
Effect of Zn Dopant on Crystal Structure, Optical Properties, and Photocatalytic Activity of TiO2/ZnxNi1-xFe2O4 Composites by Co-Precipitation Method for Degrading Liquid Waste of the Textile Industry Arisma Nurul Fauziyah, Khorifathul Khoiriyah, Vindy Yurike Oktavia, Herlin Pujiarti, and Joko Utomo* Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang Jl. Semarang 5 Malang 65145, Indonesia *joko.utomo.fmipa[at]um.ac.id Abstract TiO2/ZnxNi1-xFe2O4 nanocomposites (x = 0- 0.2- 0.4- 0.6- 0.8- and 1) were synthesized using co-precipitation method at annealing temperature of 600oC for 3 hours. X-ray diffraction pattern showed high percentage of anatase TiO2 phase and slight proportion of Zn-NiFe2O4 spinel ferrite phase. The lattice parameters in all samples are in the range a = b = 3.782-3.791 A and c = 9.487-9.524 A. Crystal size tends to decrease with increasing Zn content between 11.34-15.64 nm. The results of SEM characterization showed that the particle size of the sample x = 0.2 and 0.8 were 95.9 nm and 110.8 nm, respectively. The FTIR spectra measured at a wave number of 400-4000 cm-1. Vibration of metal ion with oxygen (M-O) occurred at wave number of 416.62 cm-1, which confirmed might be the spinel ferrite in the TiO2/ZnxNi1-xFe2O4 nanocomposites. The presence of the titanium dioxide phase was confirmed by wave number 671.64 cm-1 in the FTIR spectrum which is the Ti-O-Ti vibration. The energy gap of TiO2/ZnxNi1-xFe2O4 nanocomposites decreased with the addition of Zn content in the range of 2.77-3.01 eV. The value obtained is lower than the band gap energy of pure TiO2. The highest degradation of RhB dye was 35.94% with a degradation rate of 0.002 minutes-1 on sample x = 0.2 for 120 minutes with 10 watt UV irradiation. Keywords: photocatalyst, rhodamine B, zinc-nickel ferrite, titanium dioxide, co-precipitation Share Link | Plain Format | Corresponding Author (Arisma Nurul Fauziyah)

3	Catalyst and photocatalyst	ABS-55
Study of Kinetic Effects of Copper Catalysts on Graphene Growth Agus Ismangil1, a), Fatimah Arofiati Noor2, Toto Winata3, and Irzaman4 1, 2, 3Department of Physics, Faculty of Mathematics and Natural Science, Bandung Institute of Technology, Bandung, Indonesia 4Department of Physics, Faculty of Mathematics and Natural Science, Bogor Agricultural Institute, Bogor, Indonesia Abstract The growth of graphene material using the chemical vapor deposition (CVD) technique requires a catalyst in the formation of the reaction, the presence of a catalyst to increase the speed of the chemical reaction that takes place. The kinetics of the reaction rate depends on the temperature using the Arrhenius equation, using the slope technique. Then the activation energy value is obtained by using the slope between ln k to temperature changes, with 10 wt.% which is 68.7 kJ/mol. while the value of the activation energy of copper with (5, 10, 20, and 30 wt.%) was 94.3 kJ/mol. This indicates that the reaction proceeds faster using a copper catalyst. The faster a reaction allows the collision of large numbers of particles in a relatively short time and a lower energy level so that equilibrium will be reached at a faster time. Keywords: catalyst, copper, nickel, activation energy Share Link | Plain Format | Corresponding Author (Agus Ismangil)

4	Catalyst and photocatalyst	ABS-61
Comparison of Durability TiO2/Graphene to Batik Waste Processing For Photodegradation Applications Hariyanto Hidayat1,b), Nandang Mufti 1,2,a), Atika Sari Puspita dewi1, Poppy Puspitasari3, Sunaryono1,2 University of Malang (UM) Jl. Semarang No.5, Sumbersari, Kec. Lowokwaru, Kota Malang, Jawa Timur 65145 Abstract The increase in textile production causes an increase in the amount of liquid waste. This increase can cause pollution to the environment if not treated properly. Therefore, it is necessary to treat textile waste that is effective and efficient to overcome this. This study aimed to investigate the effect of adding graphene to the durability of TiO2 superimposed on a cork ball. The floating cork balls cause the TiO2/Graphene composite layer can work optimally after exposure to sunlight. The sol-gel method has been successfully carried out by coating the cork ball on TiO2/Graphene. The deep coating method was used to deposit TiO2 and Graphene on cork balls. Characterization in this study using XRD, FTIR, SEM, and UV-Vis. The diffraction peak with XRD shows TiO2, which has a crystal size of 6.7 nm, while graphene is amorphous and does not have a crystal structure. SEM test results show that TiO2 has a porosity of 80.3%. TiO2, with the addition of graphene concentration, decreased with a wavelength range of 121-84 nm. The smallest absorbance and band gap values occur in TiO2-10% graphene with an absorbance value of 213 nm and a band gap value of 2.9 eV. For comparison, the TiO2/Graphene band gap (0.01) for 2 days of durability has a band gap of 4.2 eV, while the TiO2/Graphene (0.01) band gap (0.01) has a band gap of 4.1 eV for 3 days with a wavelength close to visible light. Therefore, the longer the irradiation, the fewer UV rays absorbed. So this research is successful in degrading batik waste properly. Keywords: Batik Waste, Catalysts, Graphene, Photocatalyst, TiO2 Share Link | Plain Format | Corresponding Author (Hariyanto Hidayat)

5	Catalyst and photocatalyst	ABS-73
The Catalyst Performance of Carbon Quantum-Dot Modified TiO2 Composite Asrianti Bt. Sunardi1,b), Nandang Mufti1,2,a), Hari Wisodo1, Hendri Widiyandari3 1 Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No. 5, Malang 65145, Indonesia 2 Centre of Material for Renewable Energy, Universitas Negeri Malang, Malang 65145, Indonesia 3 Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Sebelas Maret, Jl. Ir. Sutami 36 A, Surakarta, Central Java, 57126, Indonesia Abstract Quantum-dot carbon (CQD) has great potential in enhancing the photocatalytic performance of TiO2 materials and their optical absorption into visible light. Here, we study the properties of TiO2/CQD in detail as a catalyst material. The CQD was successfully synthesized using the hydrothermal method at 160 C for 8 hours, and the TiO2/CQD composite was successfully synthesized using the hydrothermal method at 100 C for 8 hours. FTIR characterization was carried out to determine the functional groups and UV-Vis to determine the optical and photocatalytic properties. FTIR results showed that the peak of O-H stretching at 3500-3250 cm-1, C-O stretching at 1400 cm-1, C=C bonding at 1625 cm-1, and Ti-O extending below 1000 cm-1 came from samples containing TiO2. The results of UV-Vis analysis show that the TiO2/CQD absorption region is around 300-320 nm towards the visible light region. The band gap energy of TiO2 is 3.44 eV, but the addition of CQD caused the reduction of the band gap energy to 3.41 eV, leading to an increase of photocatalytic activity. Keywords: Carbon Quantum-Dot, Hydrothermal, Photocatalytic, TiO2 Share Link | Plain Format | Corresponding Author (Asrianti Bt Sunardi)

6	Catalyst and photocatalyst	ABS-82
Annealing dependence of structural, magnetic, and photocatalytic properties in hematite nanoparticles synthesized by sol-gel method Hikmah Maulidina1,*, Utari1, Suharno2, Hendri Widiyandari1, Budi Purnama1,* 1) Department of Physics, Faculty of Mathematics and Natural Sciences, Sebelas Maret University, Jl. Ir Sutami 36A Kentingan Jebres Surakarta 57126, Indonesia 2) Physics Education Department, Faculty of Teacher Training and Education, Universitas Sebelas Maret, Jl. Ir. Sutami 36A Kentingan, Jebres, Surakarta, 57126, Idonesia Abstract Hematite nanoparticle has been successfully synthesized by the sol-gel method. Post annealed at 400&#8728-C, 500&#8728-C, 600&#8728-C, and 700&#8728-C for 4 hours are used to modify the structural, morphological, and magnetic properties. Fourier Transform Infrared (FTIR) result present the primary vibration of Fe-O in the wave number k is 461.97-542.02 cm-1. The X-ray Diffraction (XRD) and Scanning Electron Microscopy (SEM) confirm the crystalline size increases with annealed temperature. Vibrating Sample Magnetometer (VSM) result show that the annealed temperature changes the magnitude of coercive force (Hc) as well as magnetization saturation. The performance of hematite as a photocatalyst was evaluated using methylene blue 10 ppm as a pollutant model. It was found that the sample with an annealing temperature of 400&#8728-C successfully decomposed methylene blue of 69.54% for using 40 mg under 80 minute ultraviolet irradiation. Keywords: hematite, sol-gel, annealed temperature Share Link | Plain Format | Corresponding Author (Hikmah Maulidina)

7	Magnetic materials	ABS-8
Impact of Zinc ions substitution on the microwave absorption of the Barium-Strontium-hexaferrite paint nanoparticle composites Maya Puspitasari Izaak(1*), Yohanes Edi Gunanto(1), Henni Sitompul (1) , Yosef Sarwanto (2) and Wisnu Ari Adi(2) 1) Department of Physics Education, Faculty of Education, University of Pelita Harapan, Karawaci, Tangerang 15811, Indonesia *maya.izaak[at]uph.edu 2) Center for Research and Technology of Advanced Materials, National Research and Innovation Agency, Tangerang Selatan 15314, Indonesia Abstract Zinc substituted Barium-Strontium-hexaferrite (Ba0.6Sr0.4Fe10-xZnxMnTiO19, with x = 0.1, 0.3, and 0.5) nanoparticles have been successfully manufactured by solid-state reaction method using a high energy ball mill (HEBM). An X-ray diffractometer (XRD) and scanning electron microscopy (SEM) characterized phase formation and surface morphology. Ba0.6Sr0.4Fe10-xZnxMnTiO19 nanoparticles, with x = 0.1- 0.3- and 0.5, each was mixed with paint with a weight ratio of 1:3. Each mixture was then stirred until homogeneous. The hexaferrite paint composite was sprayed onto the metal plate, then dried in air. The ability to absorb microwaves is expressed by the value of reflection loss (RL) in the frequency range 8-12 GHz (X-band), characterized using a vector network analyzer (VNA). The results obtained, Ba0.6Sr0.4Fe10-xZnxMnTiO19 nanoparticles (x = 0.1- 0.3- and 0.5) were in phase with a hexagonal crystal structure and the average particle size was 200 nm. This substitution shows that the greater the concentration of Zinc substitution, the smaller the absorption percentage. The ability of the hexaferrite paint composite sample to absorb electromagnetic waves obtained reached 94.5% at a frequency of 8.46 GHz for the sample x = 0.1 with 290 micron paint thickness. Keywords: nanocomposite- Ba0.6Sr0.4Fe10-xZnxMnTiO19- solid-state reaction method- absorption- X-bandse Just Try to Submit This Sample Abstract Share Link | Plain Format | Corresponding Author (Maya Puspitasari Izaak)

8	Magnetic materials	ABS-10
Hexaferrite/nickel Ferrite/epoxy Composite as an Absorber of Electromagnetic Waves in the 2-18 GHz Range Yohanes Edi Gunanto (1,*) Maya Puspitasari Izaak (1), Henni Sitompul (1), Yosef Sarwanto (2) and Wisnu Ari Adi (2) (1) Department of Physics Education, Faculty of Education, University of Pelita Harapan, Karawaci, Tangerang 15811, Indonesia *yohanes.gunanto[at]uph.edu (2) Center for Research and Technology of Advanced Materials, National Research and Innovation Agency, Tangerang Selatan 15314, Indonesia Abstract The rapid development of wireless technology not only has a positive impact but also has a negative impact. The emergence of electromagnetic waves generated from the components of these electronic devices can interfere with and endanger human health. In this case, Barium-strontium-hexaferrite/nickel ferrite/epoxy composite is used as an electromagnetic wave absorber in the frequency range of 2-18 GHz. Ba0.6Sr0.4Fe11.75Al0.25O19 and NiFe2O4 nanoparticles were prepared by solid-state reaction method using milling, respectively. The composite sample Ba0.6Sr0.4Fe11.75Al0.25O19/ NiFe2O4 has a hexagonal/cubic crystal structure with an average particle size of 250 nm with a heterogeneous shape. The crystal structure and the formed phase were characterized using an X-ray diffractometer, while the surface morphology was characterized by scanning electron microscopy (SEM). The magnetization properties at room temperature were characterized using a vibrating sample magnetometer (VSM) respectively. The ability to absorb microwaves in the frequency range of 2-18 GHz was characterized using a vector network analyzer (VNA). The saturation magnetic Ms and the coercive field Hc at room temperature were 46,037 emu/g and 0.962 kOe, respectively. The largest RLmin value is -32.89 dB at a frequency of 5.78 GHz with a bandwidth of 2.56 GHz. Keywords: absorption- composite- hexaferrite- microwave- nickel-ferrite Share Link | Plain Format | Corresponding Author (Yohanes Edi Gunanto)

9	Magnetic materials	ABS-21
Synthesis and Characterization of TiFe2O4/AC Nanocomposite as Heavy Metal (Cd) Adsorbent Soffy Septya Noviatin, Ahmad Taufiq*, Herlian Pujiarti, Arif Hidayat, Nandang Mufti, ST. Ulfawanti Intan Subadra Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5, Malang, 65145, Indonesia Abstract In this study, natural materials were used as the main precursors in the synthesis of TiFe2O4/AC nanocomposites for heavy metal (Cd) adsorption. The synthesis of the nanocomposite was carried out through the coprecipitation method. The characterization instruments used in this study were XRD, SEM, FTIR, Uv-Vis, and AAS to determine the structure, morphology, functional groups, and adsorption performance of the nanocomposite. The XRD pattern showed the formation of a single phase of TiFe2O4 with a cubic spinel structure. Meanwhile, AC diffraction peaks were not detected because of the very low composition in the nanocomposite. The results of refinement analysis using a Rietica program obtained a crystallite size of 9.6 nm. The SEM image showed that the morphology of the nanocomposite tended to agglomerate in nanometric size. FTIR data analysis showed the presence of AC absorption peaks that contain oxygen functional groups such as C-O and C=O. As Fe-O bonds were detected at a wavenumber of 528 cm-1. The Uv-Vis data showed that the band gap of TiFe2O4/AC nanocomposite was 2.82 eV. Furthermore, the results of AAS characterization showed that the capacity of the adsorption tended to fluctuate as the contact time increases- this was likely due to the presence of active sites of the adsorbent filled by the adsorbate. The percentage of Cd absorption produced by the TiFe2O4/AC nanocomposite was quite high, which was 93.36%. Keywords: Heavy metal adsorbent, cadmium (Cd), TiFe2O4/AC, nanocomposite, adsorbent capacity Share Link | Plain Format | Corresponding Author (Soffy Septya Noviatin)

10	Magnetic materials	ABS-22
Synthesis and Characterization of Nanosized Mg0.2Fe2.8O4/AC/TiO2 Composite for Removal Pb(II) from Water Berliantty Warim Putri, Ahmad Taufiq*, Chusnana Insjaf Yogihati, Sunaryono, ST. Ulfawanti Intan Subadra, Nandang Mufti, Markus Diantoro Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5, Malang 65145, Indonesia Abstract This study aimed to synthesize the nanosized Mg0.2Fe2.8O4/AC/TiO2 composite for removal Pb(II) from water. The crystal structure and functional group of the sample were evaluated using XRD and FTIR spectroscopy. The morphology and band gap energy of the sample were characterized by means of SEM and UV-Vis spectroscopy. Meanwhile, the absorbance performance of the nanocomposite for removal Pb(II) was evaluated using AAS characterization. The results of the data analysis in this study showed that the Mg0.2Fe2.8O4/AC/TiO2 nanocomposite was successfully synthesized using the coprecipitation method. The result of the XRD characterization presented the 2 phases, namely Fe3O4 and TiO2. The FTIR characterization results showed that the nanocomposite had a Fe-O bond at the tetrahedral and octahedral positions that were detected in the wavenumber range of 800-500 cm-1. The SEM image showed that the morphology of nanocomposite tended to agglomerate with a particle size distribution of 44.3 nm. The band gap energy resulting from the UV-Vis test analysis was 3.492 eV. Interestingly, the absorption efficiency for removal PB(II) of the Mg0.2Fe2.8O4/AC/TiO2 nanocomposite reached 99.08%-99.90%. Keywords: Mg0.2Fe2.8O4/AC/TiO2, nanocomposite, adsorption efficiency, removal Pb(II), water pollution. Share Link | Plain Format | Corresponding Author (Berliantty Warim Putri)

11	Magnetic materials	ABS-25
Synthesis of Chromium Ferrite Ferrofluid for Magnetic Field Sensor Application Mar^atus Sholikhah, Ahmad Taufiq*, Arif Hidayat, Markus Diantoro, Sunaryono, ST. Ulfawanti Intan Subadra Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5, Malang, 65145, Indonesia Abstract In this work, iron sand was used in the synthesis of chromium ferrite ferrofluid for magnetic sensor application. The characterizations were carried out using X-ray diffraction (XRD), scanning electron microscope (SEM), ultraviolet visible (UV-Vis) spectrometer and magnetic field sensor test. The produced ferrofluid had a filler particle size of 8.6 nm. The result of SEM data analysis showed that the morphology of the chromium ferrite nanoparticles was spherical in shape and had a diameter range of 20-30 nm. The band gap value for the prepared ferrofluid was 2.6 eV. The intensity in the magnetic field sensor test for chromium ferrite ferrofluid was 12 lux. Therefore, the chromium ferrite ferrofluid can be used as a magnetic field sensor in the future. Keywords: Ferrofluid, magnetic field sensor, chromium ferrite, iron sand. Share Link | Plain Format | Corresponding Author (Maratus Sholikhah)

12	Magnetic materials	ABS-26
Synthesis and Characterization of Cobalt Ferrite/Zinc Oxide Nanocomposite Combined with Activated Carbon for Cu Removal Application Falichal Abida Fi Ramadhani, Ahmad Taufiq*, Nandang Mufti, Robi Kurniawan, Arif Hidayat, ST. Ulfawanti Intan Subadra Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang Abstract In this research, cobalt ferrite/zinc oxide nanocomposite combined with activated carbon for the application of Cu removal was successfully synthesized by co-precipitation and sol-gel methods. Identification of the crystal structure through X-ray diffraction characterization showed the formation of the spinel cubic structure for the cobalt ferrite nanoparticles and the hexagonal wurtzite structure for the ZnO nanoparticles. The result of the SEM characterization showed that the morphology of the sample had a spherical shape and chunks. The average particle size for the spherical shape was 65.4 nm. FTIR spectrum confirmed the presence of all component materials that contained of cobalt ferrite, zinc oxide, and activated carbon. The adsorption performance for Cu removal was tested by varying contact time for 15, 30, 60, 120, and 240 minutes. The adsorption activity showed that the Cu removal efficiency reached 99% with an adsorption capacities of 11.00 mg/g. Therefore, the prepared cobalt ferrite/zinc oxide nanocomposite combined with activated carbon opens a new potency as a new material for Cu removal application. Keywords: Cobalt ferrite/zinc oxide, nanocomposite, activated carbon, Cu removal application, adsorption efficiency. Share Link | Plain Format | Corresponding Author (Falichal Abida Fi Ramadhani)

13	Magnetic materials	ABS-39
Fabrication and Characterization of Titanium Oxide/Magnetite Ferrofluid as Antifungal Agent Maulit Diyan Nuraini, Ahmad Taufiq*, Chusnana Insjaf Yogihati, Nasikhudin, Sunaryono Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No. 5, Malang 65145, Indonesia Abstract The aim of this research was to fabricate titanium oxide/magnetite ferrofluid from natural sand with dimethylsulfoxide as a surfactant and olive oil as a dispersant agent for antifungal application. Crystal structure, morphology, functional group, and antifungal agent through characterization using XRD, SEM, FTIR, and well diffusion method. The XRD analysis results show that the titanium oxide nanoparticle had an anatase structure with a tetragonal shape, while the magnetite nanoparticle had an inverse spinel cubic structure. Furthermore, the crystallite sizes of the titanium oxide and magnetite nanoparticles were 12.6 and 12.9 nm, respectively. The results of the SEM analysis showed that titanium oxide/magnetite was composed of dark and white-colored, spherical and cube-shaped particles that had agglomerated with a particle size of 21.6 nm. The results of FTIR analysis of the ferrofluid presented titanium oxide and magnetite nanoparticles which were indicated by Fe-O vibrations at wavenumbers of 586 cm-1 and 707 cm-1 and Ti-O vibrations at a wavenumber of 459 cm-1. Finally, the prepared titanium oxide/magnetite ferrofluid exhibited excellent antifungal activity with an inhibition zone diameter of 7.5 mm. Keywords: ferrofluid, titanium oxide/magnetite, iron sand, antifungal agent. Share Link | Plain Format | Corresponding Author (Maulit Diyan Nuraini)

14	Magnetic materials	ABS-40
Fabrication of Mn0.30Fe2.70O4/TiO2 Thin Film based on DSSC using Spin Coating Method and Its Potential Applications as Photovoltaic Nadya Eka (1), Sunaryono Sunaryono (1, 2*), Eny Latifah (1), Nadiya Miftachul Chusna (1), Nandang Mufti (1, 2), and Ahmad Taufiq (1, 2) 1) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No. 5, Malang 65145, Indonesia. *sunaryono.fmipa[at]um.ac.id 2) PUI-PT Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jalan Semarang No. 5, Malang 65145, Indonesia. Abstract This research aims to produce the Mn0.30Fe2.70O4/TiO2 thin film based on DSSC and its potential application for photovoltaics. The Mn0.30Fe2.70O4/TiO2 powder has been successfully synthesized using the solid-state reaction method. Meanwhile, the Mn0.30Fe2.70O4/TiO2 film was fabricated using the spin coating method. Characterization of Mn0.30Fe2.70O4/TiO2 was carried out using XRD and FTIR to determine the crystal size and the functional groups formed, respectively. The characterization of absorbance value, band gap value, and photovoltaic efficiency performance of Mn0.30Fe2.70O4/TiO2 thin film were using UV-Vis and solar simulators. The results of the characterization using XRD obtained information about the size of the nanocomposite Mn0.30Fe2.70O4/TiO2 of 9.43 and 6.12 nm for the Mn0.30Fe2.70O4 phase and the TiO2 phase, respectively. Based on the solar simulator result, the efficiency performance value of the Mn0.30Fe2.70O4/TiO2 thin film was about 0.0325%, so the thin film has the potential to be applied to photovoltaics. Keywords: DSSC- composite Mn0.30Fe2.70O4/TiO2- spin coating- photovoltaic. Share Link | Plain Format | Corresponding Author (Nadya Eka Agustin Ermalita)

15	Magnetic materials	ABS-42
Synthesis and Characterization of Magnetite-CS/AC/Titania Nanocomposite for Heavy Metal (Cu) Adsorption Muhammad Rusdi1, Ahmad Taufiq1*, Sumari2, Sri Wahyuni2, Arif Hidayat1, Sunaryono1, ST. Ulfawanti Intan Subadra1 1Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5, Malang 65145, Indonesia 2Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5,Malang 65145, Indonesia *Corresponding author email: ahmad.taufiq.fmipa[at]um.ac.id Abstract In this study, the synthesis of magnetite-CS/AC/titania nanocomposite has been carried out to produce a new adsorbent agent for heavy metal (Cu) adsorption. The nanocomposite was characterized by means of X-ray diffractometry (XRD), Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), and atomic adsorption spectroscopy (AAS). Based on the analysis of the XRD data, the nanocomposit exhibited a magnetite phase detected at 2-theta of 30.35o- 35.64o- 43.25o- 53.66o- 57.31o- and 62.76o while the AC phase was detected at 2-theta of 22.82o-24.65o. Furthermore, titania diffraction peaks were detected at 2-theta of 25.28o- 37.93o- 48.06o- 54.24o- 55.07o- 62.85o- and 68.81o. The SEM image showed that the nanocomposite had an average particle size of 50 nm. Based on the FTIR-spectrum, the presence of Fe-O was detected at wavenumbers of 595 cm-1 and 453 cm-1, N-H at a wavenumber of 1667 cm-1, Ti-O-Ti at a wavenumber of 653 cm-1, C=O and C=C at wavenumbers of 1613 cm-1 and 1706 cm-1, O-H and N-H at wavenumbers of 3240 cm-1 and 3503 cm-1. The analysis result for the nanocomposite AAS data showed that the adsorption capacity for heavy metal (Cu) was 86.9%. Keywords: Adsorbent agent, nanocomposite, magnetite-CS/AC/titania, adsorption capacity, heavy metal (Cu) Share Link | Plain Format | Corresponding Author (Muhammad Rusdi)

16	Magnetic materials	ABS-43
Studies on Efficient Removal Cu(II) Using Magnetite/Titania/ZAA Nanocomposite Sri Wahyuni1, Ahmad Taufiq2,*, Sumari1, Muhammad Rusdi2, ST. Ulfawanti Intan Subadra2, Trio Erik Setyawan2 1Department of Chemistry, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5, Malang 65145, Indonesia 2Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang 5, Malang 65145, Indonesia *Corresponding author email: ahmad.taufiq.fmipa[at]um.ac.id Abstract In this work, magnetite/titania/ZAA nanocomposite has been synthesized as a new adsorbent for heavy-metal Cu(II). The nanocomposite was characterized using an atomic adsorption spectroscopy (AAS) instrument to investigate the value of the adsorption capacity. The results of the AAS analysis showed that the nanocomposite had a good adsorption efficiency of the heavy metal Cu(II) with an adsorption capacity value of 78.9% in a contact time of 90 minutes. The results obtained were analysed using kinetic models and adsorption isotherms. The pseudo-first-order kinetic model had an R2 value of 0.964 and a pseudo-second-order R2 value of 0.999. The adsorption isotherm in this study was the Freundlich isotherm with R2 0.993 and the Langmuir isotherm R2 0.974. Such parameters were used to determine the adsorption characteristics of magnetite/titania/ZAA nanocomposite. The nanocomposite was easy to separate from contaminants in the adsorption process and had a speed in the absorption of heavy metal Cu(II). Therefore, the combination of magnetite with zeolite and titania with natural base materials such as iron sand and active natural zeolite has good potential for the development of a new adsorbent agent. Keywords: Adsorption capacity, Cu heavy metal, magnetite/titania/ZAA nanocomposite, natural material, nanocomposite. Share Link | Plain Format | Corresponding Author (Sri Wahyuni)

17	Magnetic materials	ABS-52
Study of Physical Properties of Mn0.25Fe2.75O4/CNC Hybrid Catalyst from Medical Cotton by Co-precipitations Method Winna Aurellia K.C (1,a), Sunaryono Sunaryono (1,2,b*), Nadiya Miftachul Chusna (1,c), Ahmad Taufiq (1,2,d), and Nandang Mufti (1,2,e) 1) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No. 5, Malang 65145, Indonesia 2) PUI-PT Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jalan Semarang No. 5, Malang 65145, Indonesia Abstract Cellulose Nanocrystal (CNC) has been prepared from medical cotton. The nanocomposite of Mn0.25Fe2.75O4/CNC hybrid catalyst was synthesized using the co-precipitations method. The IR spectra of the Mn0.25Fe2.75O4/CNC nanocomposite showed that Fe-O vibration was detected on wavenumber around 523 cm-1 - 710 cm-1. This result confirms that Mn0.25Fe2.75O4 was successfully formed. The success of CNC nanoparticles in Mn0.25Fe2.75O4/CNC hybrid catalyst was from detected of 1000 cm-1 - 1650 cm-1. The XRD pattern showed that the samples were having two phases of crystal. The Fe3O4 phase in cubic spinel in nanometric size and highest peak on (311) plane. The peak of the CNC phase on 2&#952- was around of 22,5. Furthermore, characterizations of magnetic properties showed that the Mn0.25Fe2.75O4/CNC nanocomposite has superparamagnetic properties with S shape hysteresis loop. Keywords: Mn0.25Fe2.75O4, CNC, absorbent, medical cotton Share Link | Plain Format | Corresponding Author (Winna Aurellia Kharisma Chelcyadilla)

18	Magnetic materials	ABS-60
Effect of Surfactant Concentration, Replacement Tip Height, Pulse On Off Times, and Dispersant Media on BaFe10.8Mg0.6Al0.6O19 as a Radar Absorber Material Erlina Yustanti1,2a), Alfian Noviyanto3,4 b), Ahmad Taufiq5,c), Tubagus Maulana Ikhsan1,d), Laila Chusnul Chotimah1,e) and Maulana Randa6,f) 1Department of Metallurgical Engineering, Faculty of Engineering, Sultan Ageng Tirtayasa University Jl. Jend. Sudirman KM. 03 Cilegon, Banten 42435, Indonesia 2Centre of Excellence, Nanomaterial and Process Technology Laboratory, Faculty of Engineering, Sultan Ageng Tirtayasa University 3Advanced Materials Research Group, Nano Center Indonesia, Jl. PUSPITEK, Tangerang Selatan, Banten, 15314, Indonesia 4Department of Mechanical Engineering, Mercu Buana University Jl. Meruya Selatan, Kebun Jeruk, Jakarta 11650, Indonesia 5Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang Jl. Semarang No 5, Malang 65145, Indonesia 6Research and Development Agency, Indonesia Ministry of Defense. Jl. Jati No.1, Pondok Labu, Jakarta 12450 Indonesia Abstract Radar Absorbing Materials as microwave absorbing materials are very interesting to continue to be developed by researchers. Efforts to increase the absorption of electromagnetic waves with a low production cost with a large production scale are the main attractions for researchers. Material engineering with the substitution of Mg-Al in barium hexaferrite through the mechanical alloying process which can change the properties of the material from hard magnet to soft magnet is very attractive because it is practical and environmentally friendly. The increase in absorption of electromagnetic waves is influenced by particle sizes, in which the smaller the particle sizes, the greater the contact surface area between particles will be. The 20-kHz high-power ultrasonic destruction method effectively reduces the particle sizes so it results in a homogeneous distribution by controlling the parameters in the sonication technique. In this study, the synthesis of absorbing material began with mixing stoichiometric precursors of BaCO3, Fe2O3, MgO, and Al2O3 in a planetary ball mill. The mechanical alloying process using an alcohol medium at a speed of 3000 rotations per minute for 20 hours resulted in homogenization and amorphization. Sintering at a temperature of 1200oC for 2 hours succeeded in growing BaFe10.8Mg0.6Al0.6O19 crystallite embryos. Sonication for 6 hours at an amplitude of 55% succeeded in reducing the particle size of BaFe10.8Mg0.6Al0.6O19 to 90.5%. The optimal parameters in the sonication process were surfactant concentration of 0.01%, replacement tip height of 2 cm, and pulse on-off of 59:59 seconds in ethanol dispersant media, which resulted in 51-nm BaFe10.8Mg0.6Al0.6O19 nanoparticles. The nanoparticle resulting from the sonication technique at the optimum parameters succeeded in reducing the reflection loss by -31.636 dB and increasing the absorption of electromagnetic waves by 99.92% at a frequency of 8.2-12.4 GHz. Keywords: Barium hexaferrite, reflection loss, radar absorbing material, ultrasonic irradiation Share Link | Plain Format | Corresponding Author (Erlina Yustanti)

19	Magnetic materials	ABS-69
Micromagnetic Investigation of Magnetic Domain Wall Depinning Dynamics by Symmetrical Triangular Notch Geometries in Perpendicular Magnetization CoFeB Nanowire Candra Kurniawan 1, 2 a) and Dede Djuhana 1, b) 1Departement of Physics, Faculty of Mathematics and Natural Sciences, Universitas Indonesia (UI), Kampus Baru UI Depok 16424, Indonesia. 2Research Center for Advanced Materials, National Research and Innovation Agency (BRIN), KST BJ Habibie Office Area, Tangerang Selatan 15314, Indonesia. Abstract To optimally control the DW in the nanowire, there are some focuses on the utilization of geometrical notch as an artificial pinning potential. Most of the studies were intended to explain the dynamics of DW structure when passes or move out from the notch. However, there is still a lack of discussion about the geometrical structure of notch in the nanowires. Our previous studies explained the effect of notch length and dept to the DW depinning behavior by electrical current and magnetic field pulse in in-plane magnetization Permalloy material. In this work, the dynamics of domain wall depinning by double triangular notch in the perpendicular magnetization CoFeB nanowire was investigated using micromagnetic simulation from the initial ground-state condition. The micromagnetic model of material was mimicking the CoFeB stripe-shape nanowire with a perfect single crystalline structure. The simulation process was performed by relaxing the initial Bloch-type wall for 1 ns. Then the electrical current pulse was injected to the wire on the +x-direction for 1 ns of pulse length. The DW depinning condition determined by the edge of DW leave out the notch area, which was relate to the artificial pinning potential in the nanowire made by the notch. The micromagnetic results showed that the notch depth (d) variation was linearly increasing the value of the depinning current density, Jd. However, the Jd value was significantly increasing on the larger size of d, particularly on d > 20 nm. Therefore, this work explained that the small difference size of a particular notch design should be considered to achieve better control in the DW based devices. Keywords: CoFeB- depinning- domain wall- micromagnetics- nanowire Share Link | Plain Format | Corresponding Author (Candra Kurniawan)

20	Magnetic materials	ABS-75
Study of Antioxidant of Self Nano Emulsifying Drug Delivery System (SNEDDS) Based on Fe3O4/Ginger Extract/VCO Ferrofluid Sri Ainaiyah Ariadi Putri 1,a , Sunaryono 1,2,b*, Nasikhudin 1,2,c, and Nadiya Miftachul Chusna 1,2,d 1Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Jl. Semarang No. 5, Malang 65145, Indonesia 2PUI-PT Centre of Advanced Materials for Renewable Energy, Universitas Negeri Malang, Jalan Semarang No. 5, Malang 65145, Indonesia Abstract In this research, the synthesis of SNEDDS based on Fe3O4/Ginger Extract has been successfully using the coprecipitation method and VCO as the surfactant of the ferrofluids. The characterization sample was carried out using the XRD, FTIR, PSA instrument, and antioxidant activity. The XRD instrument shows the X-ray diffraction pattern of the Fe3O4 crystal phase and ginger extract amorph phase. The results of characterization using FTIR showed that the functional groups of SNEDDS based on Fe3O4/Ginger Extract/VCO ferrofluids were formed with a Zeta Average value of 14.72 nm based on the results of characterization using PSA. Antioxidant activity characterization of the SNEEDS shows that the sample has excellent antioxidant activity. Keywords: Fe3O4, SNEDDS, Ginger, VCO, Ferrofluid Share Link | Plain Format | Corresponding Author (SRI AINAIYAH ARIADI PUTRI)

21	Magnetic materials	ABS-76
Please Just Try to Submit This Sample Abstract Please Just Try to Submit This Sample Abstract Please Just Try to Submit This Sample Abstract You Can Edit It Again Later Abstract Please Just Try to Submit This Sample Abstract You Can Edit It Again Later Keywords: Please Just Try to Submit This Sample Abstract Share Link | Plain Format | Corresponding Author (James Hadinata)

22	Magnetic materials	ABS-80
The Influence of Temperature on Magnetic Field of Fe3O4-TMAH Ferrofluid Aziza Tanzila Meilenia, Sunaryono, Chusnana Insjaf Yogihati, Nadiya Miftachul Chusna, Nandang Mufti, Ahmad Taufiq, Yoyok Adisetio Laksono Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang Abstract Keywords: Fe3O4, TMAH, Ferrofluid, Magnetic field, Temperature Share Link | Plain Format | Corresponding Author (Aziza Tanzila Meilenia)

23	Magnetic materials	ABS-81
Synthesis and Characterization Yttrium Doped Cobalt Ferrite Prepared by the Sol-gel Auto-combustion Procedure Dwi Teguh Rahardjo, Sri Budiawanti, Suharno, Risa Suryana, Agus Supriyanto, Budi Purnama Universitas Sebelas Maret Abstract This research aims to make a nano-sized cobalt ferrite magnetic material doped with a Yttrium element with a molarity concentration of 0.1. The sol-gel automatic combustion method synthesized yttrium-doped cobalt ferrite nanoparticles with the chemical formula CoY0.1Fe1.9O4. The samples obtained were annealed at atmospheric conditions at temperatures of 200 C, 300 C, 400 C, and 500 C for 4 hours. X-Rays Diffraction (XRD) results show that the yttrium-doped cobalt ferrite samples are an inverse spinel with space group Fd-3m. The results of Fourier-Transform Infrared (FTIR) spectroscopy showed the presence of metal-O bonds around wave numbers (k) 436 cm-1 and 573 cm-1, a characteristic of cobalt ferrite compounds. From the Vibrating Sample Magnetometer (VSM) measurement results, it can be seen that there is a decrease in magnetic saturation with an increase in annealing temperature, namely 33,162 emu g, 30,190 emu g, 29,493 emu g, and 28,078 emu g. From the calculation of the Scherrer equation, the crystal size of D increased with increasing annealing temperature, namely 12.48 nm, 12.90 nm, 13.00 nm, and 13.23 nm. Keywords: Sol-gel, Auto combustion, Yttrium doped, Cobalt ferrite, nanoparticle Share Link | Plain Format | Corresponding Author (Dwi Teguh Rahardjo)

24	Magnetic materials	ABS-83
Micromagnetic Study of the Bloch Domain Wall Motion on CoFeB Nanowires with Perpendicular Anisotropy Raditya Nugraha (a), Dede Djuhana (a*), and Candra Kurniawan(a, b) Department of Physics, FMIPA Universitas Indonesia, Kampus UI Depok, Depok 16424, Indonesia *dede.djuhana[at]sci.ui.ac.id Research Center for Advanced Materials, National Reseach and Innovation Agency (BRIN), Puspiptek Office Area, Tangerang Selatan 15314, Indonesia Abstract In the scope of spintronic device research, ferromagnets with perpendicular magnetization anisotropy (PMA) has become popular in the past couple of decades. Despite having generally lower domain wall (DW) velocities, PMA ferromagnets have been shown to exhibit lower driving thresholds and smaller domain walls allowing for greater control over the DW itself. Numerous research and observations have previously been made regarding the dynamics of the DW on PMA ferromagnets. However, comprehensive micromagnetic studies regarding the topic are scarcely made. In this study, we conduct micromagnetic simulations of CoFeB nanowires with perpendicular anisotropy and varying thicknesses to study the dynamics of the Bloch-wall structure DW under the influence of a field pulse. The obtained DW velocities and Walker breakdown fields are found to follow an opposite trend than that of the in-plane anisotropy ferromagnets. We were also able to observe the so-called creep motion in the low-field motion regime. Keywords: domain wall, micromagnetics, PMA, CoFeB Share Link | Plain Format | Corresponding Author (Raditya Nugraha)

25	Magnetic materials	ABS-84
Annealing Temperature Effect on Physical Properties of Lanthanum Substituted Cobalt Ferrite Nanoparticles using Co-precipitation Technique Ramadona Rahmawati (a*), Nurdiyantoro Putra Prasetya (b), Suharno (c), Utari (d), Yofentina Iriani (e), and Budi Purnama (f) a) Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Sebelas Maret, Jl. Ir. Sutami 36A Kentingan, Surakarta 57126, Indonesia *ramadonarahmawatii[at]gmail.com Abstract Lanthanum-substituted cobalt ferrite nanoparticles have been prepared by co-precipitation technique. After were annealed at 200 &#8304-C, 300 &#8304-C, and 400 &#8304-C for 5 hours, the samples were structurally characterized by X-ray diffraction (XRD) and Fourier transform infrared spectroscopy (FTIR). Magnetic properties were measured at room temperature conditions using a vibrating sample magnetometer (VSM). The effect of annealing treatment on the structural and magnetic properties of nanoparticles was investigated. XRD results showed that the obtained nanoparticles sample indicates a single phase of FCC inverse spinel conforming to ICDD No 22-1086. The crystallite size calculation at the strongest peaks shows an increase in the increase of annealing temperature. At temperature annealing of 200 &#8304-C, the crystallite size of 18.99 nm is obtained. Then the crystallite size increased to 19.90 nm and 23.21 nm for annealing temperatures at 300 &#8304-C and 400 &#8304-C, respectively. The FTIR results showed absorption band at the tetrahedral site (v1 = 589.28 - 571.92 cm-1) and the octahedral site (v2 = 471.62 - 493.80 cm-1). The absorption band that appears indicates the lanthanum ion has succeeded in replacing Fe3+ cations in the original structure of the cobalt ferrite. The VSM results show that the coercive field magnitude decreases from 700 Oe to 550 Oe as the annealing temperature increases. This result is consistent with the anisotropy constant which decreased from 7.53 x 104 erg/cm3 to 5.50 x 104 erg/cm3. Magnetic property studies have also shown a dominant dependence on crystallite size due to surface anisotropy effects. Keywords: annealing- cobalt ferrite- co-precipitation- lanthanum- nanoparticles Share Link | Plain Format | Corresponding Author (Ramadona Rahmawati)

26	Magnetic materials	ABS-96
Preparation of Fe3O4/ZnO Ferrofluids Dispersed in Sunflower Seed Oil for Antibacterial Agents Hendra Ratmono, ST. Ulfawanti Intan Subadra, Ahmad Taufiq*, Nandang Mufti, Arif Hidayat, Sunaryono, Markus Diantoro Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Negeri Malang, Indonesia Abstract In this study, the ferrofluids with Fe3O4/ZnO nanoparticles as fillers dispersed in sunflower seed oil were fabricated. Our XRD analysis results suggested that the Fe3O4 nanoparticles had a crystallite size of 9 nm with diffraction peaks detected at 2-theta of 30.3&#9675-, 35.7&#9675-, 43.4&#9675-, 53.8&#9675-, 57.3&#9675-, and 62.9&#9675-. Meanwhile, the ZnO nanoparticle presented crystallite size of 41 nm with diffraction peaks detected at 2-theta of 31. 8&#9675-, 34.4&#9675-, 36.3&#9675-, 47.5&#9675-, 56.6&#9675-, 62.9&#9675-, and 67.9&#9675-. The functional groups observed through the FTIR confirmed the successful synthesis of Fe3O4/ZnO ferrofluids with the unique functional groups of C=C observed at a wavenumber of 1700 cm-1. Furthermore, the vibration of COO- was also detected at a wavenumber of 1280 cm-1, while C-O was found at a wavenumber of 1000 cm-1. Also, the C-H2 vibration was observed at wavenumbers of 2881 cm-1 and 2990 cm-1. Our findings showed that the Fe3O4/ZnO ferrofluids dispersed in sunflower seed oil carry the potential of an excellent antibacterial agent againt S. aureus and E. coli bacteria. Keywords: Fe3O4/ZnO, ferrofluid, nanoparticle, antibacterial agent, sunflower seed oil. Share Link | Plain Format | Corresponding Author (Hendra Ratmono)

27	Magnetic materials	ABS-101
Magnetic and microwave absorption properties of BaFe12O19/BaTiO3 sintered composites system Erfan Handoko1,3a), Mangasi Alion Marpaung1, Iwan Sugihartono1,3, Anggara Budi Susila1, Riser Fahdiran1,3, Setia Budi2,3, Ahmad Taufiq4, Zulkarnain Jalil5, Wahyu Widanarto6, Sib Krishna Ghoshal7, Umaisaroh Umaisaroh8, and Mudrik Alaydrus8 1Dept. of Physics, Universitas Negeri Jakarta, Jalan Rawamangun Muka 13220, Jakarta, Indonesia 2Dept. of Chemistry, Universitas Negeri Jakarta, Jalan Rawamangun Muka 13220, Jakarta, Indonesia 3Advanced Materials Research Group, Center of Excellence, Universitas Negeri Jakarta, Jalan Rawamangun Muka 13220, Jakarta, Indonesia 4Department of Physics, Universitas Negeri Malang, Jl. Semarang 5, 65145, Malang, Indonesia 5Dept. of Physics, Syiah Kuala University, Banda Aceh, Indonesia 6Department of Physics, FMIPA, Universitas Jenderal Soedirman, Jl. dr. Soeparno 61, Purwokerto, 53123, Indonesia 7Department of Physics and Laser Centre, AMORG, Faculty of Science, Universiti Teknologi Malaysia, Johor Bahru, Skudai, 81310, Malaysia 8Dept.of Electrical Engineering, Universitas Mercu Buana, Jalan Meruya Selatan No.1, Jakarta, Indonesia Abstract We have prepared a composite materials with ferromagnetic BaFe12O19 phase (BHF) and a ferroelectric BaTiO3 phase (BTO) by mechanical milling and sintering method. The X-ray diffraction analysis proved the formation of composite system of BHF and BTO. With the addition of BTO in the composite system, a magnetic loops have been resulted at room temperature with high magnetization saturation (Ms), magnetization remanent (Mr) and coercivity (Hc) values. The effect of the addition of BTO on the microwave absorption properties of the as-prepared composites were investigated by vector network analyzer (VNA). The results showed that the minimum reflection loss values of x=0.4 and x=0.5 are obtained as &#8722-15.8 dB at 9.25 GHz (with an optimum thickness (tm) of 1.8 mm) and &#8722-40.22 dB at 8.5 GHz (with tm of 1.75 mm), respectively. Keywords: hexaferrite composite materials- magnetic properties- microwave absorption properties- reflection loss. Share Link | Plain Format | Corresponding Author (Erfan Handoko)

28	Magnetic materials	ABS-102
Microwave Absorption Abilities of The Designed Single and Double Layer of Magnetic Slab Absorber Erfan Handoko1,2,a), and Mudrik Alaydrus3,b) 1Dept. of Physics, Universitas Negeri Jakarta, Jalan Rawamangun Muka 13220, Jakarta, Indonesia 2Advanced Materials Research Group, Center of Excellence, Universitas Negeri Jakarta, Jalan Rawamangun Muka 13220, Jakarta, Indonesia 3Dept.of Electrical Engineering, Universitas Mercu Buana, Jalan Meruya Selatan No.1, Jakarta, Indonesia Abstract Slab absorber is an important topic not only for military purposes but also for commercial application. Single and double layer compact slab absorber cannot meet the required wave absorption in broad wave band besides some absorption peaks, and it is very necessary to develop a new kind of absorber to meet the need of absorption in broad wave band. In this study, microwave absorption abilities of single and double layer magnetic slab absorber (MSA) based on iron sand have been investigated in X-band (8.2-12.4 GHz) frequencies. A magnetic slab absorber (MSA) has been developed by isolating polymer medium in absorbing matrix, and the reflection loss test indicates that the MSA exhibited excellent absorption effectiveness at 8.2-12.4 GHz. Keywords: magnetic slab absorber- 8.2-12.4 GHz- microwave absorption abilities- reflection loss Share Link | Plain Format | Corresponding Author (Erfan Handoko)

29	Material theory and computing	ABS-18
Small-Angle and Wide-Angle Structural Analysis on Melting of Gold Nanoparticle: A Molecular Dynamics Study Riser Fahdiran, Anggara Budi Susila, Iwan Sugihartono, Erfan Handoko Department of Physics, State University of Jakarta, Indonesia Abstract We employed Molecular Dynamics simulation for time evolution of melting dynamics on Gold nanoparticle. The nanoparticle size is 15.91 nm. The systems are heated up from room temperature up to above melting point with different heating rates, i.e. 140 K/ps, 70 K/ps, and 28 K/ps. Hence, the system will reach final temperature in 10 ps, 20 ps, and 50 ps, accordingly. The pressure for the highest heating rate indicated strong oscillations, while for lower rates were moderate. For every 1 ps, we analyzed the sizes of each system based on Small-Angle and Wide-Angle Scattering Analysis. It indicated that the sizes of each systems are expanding as the temperature increases. The heating rate gives large influence on the dynamics of the melting. Structural evolution of the system indicated that all systems are melted at the end of simulations. Keywords: Small-Angle Scattering, Structural Analysis, Gold, Nanoparticle, Molecular Dynamics Share Link | Plain Format | Corresponding Author (Riser Fahdiran)

30	Material theory and computing	ABS-19
Melting Dynamics of Copper Nanoparticle: A Molecular Dynamics Study on Thermodynamics and Structural Analysis Riser Fahdiran, Anggara Budi Susila, Iwan Sugihartono, Erfan Handoko Department of Physics, State University of Jakarta, Indonesia Abstract In this study, we analyzed the melting of Copper nanoparticle based on Molecular Dynamics (MD) simulation. We build Copper nanoparticle with diameter of 21 nm. MD simulation provides the trajectories of the atoms within the system every time step. Thermodynamics properties, i.e. temperature and pressure, are extracted considering local contribution of surrounding atoms. We heated up Copper thin film from room temperature to slightly above melting point in 20 ps. From local temperature analysis, it is indicated that the temperature in the inner part of the system is higher compared to the surfaces. Suggesting that the melting started from the inner part of the nanoparticle. Structural analysis every 0.5 ps shows that melting process begin at 6.5 ps indicated by merging of long range peaks from structure function profile. It is also indicated that the system is completely melted at the end of simulation. Keywords: Copper, Thin Film, Molecular Dynamics, Structure Share Link | Plain Format | Corresponding Author (Riser Fahdiran)

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