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All Journal Telaah Science and Technology Indonesia Teknologi Indonesia Indonesian Physical Review
Anggito P. Tetuko, Anggito P.
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Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Computer Science & IT Education Environmental Science Materials Science & Nanotechnology Physics

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REMANENSI DAN FLUX DENSITY DARI BERBAGAI BENTUK GEOMETRI MAGNET PERMANEN Nurdiyansyah, Lukman Faris; Tetuko, Anggito P.; Aryanto, Didik; Sebayang, Perdamean
Telaah Vol 32, No 1 (2014)
Publisher : Research Center for Physics

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/tel.32.1.176

Abstract

dari berbagai bentuk geometri magnet permanen berbasis ferrite (BaFe12O19) dan logam tanah jarang (NdFeB). Nilai remanensi magnet (Br) diperoleh dari kurva histerisis (B-H curve) yang diukur dengan alat permagraph dan flux density Bz diukur secara langsung dengan menggunakan gaussmeter. Bentuk geometri dan jenis sampel uji adalah cube, ring, dan disk dari magnet permanen berbasis NdFeB dan BaFe12O19. Dari hasil penelitian diketahui bahwa magnet permanen berbasis NdFeB memiliki nilai remanensi yang lebih besar dibanding dengan magnet permanen berbasis BaFe12O19. Dari pengukuran magnet permanen berbasis BaFe12O19 didapatkan nilai Br = 1:17 kG untuk bentuk geometri ring dan untuk disk didapat sebesar Br = 1:78 kG, sedangkan dari magnet permanen berbasis NdFeB yang berbentukcube (tipe 1), cube tipe 2, dan disk didapatkan nilai Br = 7:5 kG, Br = 10:8 kG, dan Br = 5:2 kG. Untuk pengukuran flux density Bz sebagai fungsi jarak z didapatkan kesesuaian antara eksperimen dan teori. Berdasarkan hasil penelitian didapatkan bahwa nilai Br dan Bz sangat dipengaruhi oleh bentuk geometri dan jenis magnet permanen.
99 PEMBUATAN BAHAN FILTER KERAMIK BERPORI BERBASIS ZEOLIT ALAM DAN ARANG SEKAM PADI Sebayang, P.; Muljadi, -; Tetuko, Anggito P.
Teknologi Indonesia Vol 32, No 2 (2009)
Publisher : LIPI Press

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.14203/jti.v32i2.9

Abstract

The porous ceramics filter material have been made from natural zeolit and rice husk charcoal with composition variation (in % of mass). The preparation of zeolit was done using ball mill for 24 hours and rice husk charcoal was prepared using vibrating mill for 1 hour until it can be through out in 100 mesh shieve. The two raw materials about 2 grams were mixed with addition 50 ml of Polivinylalcohol (PVA), then it was mixed again until homogeny. The sample was dried pressed with pressure of 25 kgf/cm and dried in a drying oven at 60 C for 24 hours. The sintering process was done using electrical furnace with heating rate of 10C/minute until it reached temperature of 900 and 1000 C, and holded for 2 hours. From the result of porouc ceramics filter material, the optimum composition is 40% rice husk coke + 60% Zeolit with sintering temperature = 1000 C. At this condition, the properties are density = 2,16 g/cm, shrinkage = 35,94%, porosity = 66,05%, water absorption = 31,10%, modulus of rupture = 7,47 MPa, compressive strength = 4,38 MPa, and coefficient of thermal expansion = 5 x 10 -6 C-1. The result of XRD shows that zeolit has major phase of mordenite (Na8[Al8Si40O96].24H2O) and minor phase of clinoptilolite (Na6[Al6Si36O72].24H2O). The result of XRD on 40% rice husk coke + 60% Zeolit and sintering temperature = 1000 C shows that the major phase is mullite (3Al2O3SiO2) and the minor phase is tridimite (SiO2). Meanwhile, the picture of SEM shows that porous ceramics have irregular particle with size between 110 ?m and its pore size can reaches 20 ?m.
Micro-Magnetic Activity of the Fabricated MnFe2O4 via Co-Precipitation from Natural Iron Sand Rianna, Martha; Hussain, Muhammad Khalid; Sembiring, Timbangen; Guk-Guk, Herwati Permata Indah Raja; Sitorus, Kurnia Jesiska; Setiadi, Eko Arief; Tetuko, Anggito P.; Sebayang, Perdamean
Science and Technology Indonesia Vol. 10 No. 1 (2025): January
Publisher : Research Center of Inorganic Materials and Coordination Complexes, FMIPA Universitas Sriwijaya

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.26554/sti.2025.10.1.221-227

Abstract

This study explores the micromagnetic behaviour of MnFe2O4 derived from natural iron sand through the coprecipitation method, without the need for calcination. Using manganese chlo-ride and iron sand as precursors, one can create MnFe2O4. Through the utilisation of X-ray Diffraction (XRD), Scanning Electron Microscope-Energy Dispersive X-Ray (SEM-EDX), and Vibrating Sample Magnetometer (VSM), one can effectively analyse and understand the crystal structure, morphology, and magnetic properties. The crystal size was reduced by a fac-tor of 0.40 nm, as revealed by XRD crystal structure analysis. Additionally, the XRD results indicated the absence of impurities, confirming the presence of a single phase. In addition, the SEM analysis revealed that samples 1, 2, and 3 underwent agglomeration. The particles have a cubic shape. The analysis using EDX indicates that there are no other elements present in the Mn, Fe, and O. Additionally, the VSM analysis confirms that the sample exhibits magnetic hardness. Sample 1 exhibits exceptional magnetic properties, with Ms values of 217.53 emu/g, Mr 34.27 emu/g, and Hc 127.42 emu/g. Photoluminescence (PL) spectroscopy was used to observe the optical properties of MnFe2O4. Sample 1 exhibits a distinct emission spectrum at 440 nm, representing the purple band. Sample 2 displays a sharp emission spectrum at 448 nm, indicating the blue band. Lastly, Sample 3 demonstrates a clear emission spectrum at 427 nm, signifying the purple band.
ENHANCED THERMAL PERFORMANCE OF POLYETHYLENE GLYCOL-BASED PHASE CHANGE MATERIALS USING ZnO Fachredzy, Amdy; Manalu, Emmy S.; Sihotang, M. Sontang; Juwono, Ariadne L.; Tetuko, Anggito P.; Fauzi, Muhammad; Nabawi, Muhammad A. H.; Sebayang, Achmad Maulana S.; Setiadi, Eko A.
Indonesian Physical Review Vol. 8 No. 3 (2025)
Publisher : Universitas Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/ipr.v8i3.485

Abstract

Polyethylene Glycol (PEG), an organic Phase Change Material (PCM) known for its high latent heat capacity and biocompatibility, suffers from poor thermal conductivity. This research explored the addition of ZnO (at 8 and 12 wt.%) as an enhancer and SDBS as a surfactant, utilizing a two-step homogenization process at 80°C for 4 h. X-ray Diffraction (XRD) analysis confirmed that no chemical interactions or new phases occurred. Differential Scanning Calorimetry (DSC) findings revealed an enhancement in PEG's latent heat of PEG from 214 J/g to 238.3 J/g (with 8 wt.% ZnO) and 257.7 J/g (with 12 wt.% ZnO). The thermal conductivity improved by 28.2% and 30.3%, respectively, while Thermogravimetric Analysis (TGA) demonstrated increased thermal stability.  The addition of ZnO can improve the conductivity and thermal stability, while the role of SDBS is significant in increasing the latent heat, making this composite a potential candidate for Thermal Energy Storage system (TES) applications.
Co-Authors Ariadne L. Juwono Didik Aryanto Eko Arief Setiadi, Eko Arief Fachredzy, Amdy Guk-Guk, Herwati Permata Indah Raja Hussain, Muhammad Khalid Lukman Faris Nurdiyansyah, Lukman Faris Manalu, Emmy S. Martha Rianna Muhammad Fauzi Muljadi, - Nabawi, Muhammad A. H. Perdamean Sebayang Sebayang, Achmad Maulana S. Sebayang, P. Setiadi, Eko A. Sihotang, M. Sontang Sitorus, Kurnia Jesiska Timbangen Sembiring