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Perdinan Sinuhaji
DosenFisika FMIPA USU MedanJl. Bioteknologi No. 1. Kampus USU, Medan
Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Civil Engineering, Building, Construction & Architecture Control & Systems Engineering Earth & Planetary Sciences Electrical & Electronics Engineering Energy Environmental Science Materials Science & Nanotechnology Physics

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Characterization of The Volcanic Rocks of Mount Sinabung, Simacem Village, Karo Regency, Conducted With XRD, SEM-EDX Sinuhaji, Perdinan
Journal of Technomaterial Physics Vol. 1 No. 1 (2019): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v1i1.823

Abstract

The study of volcanic rocks characterization of Sinabung Volcano erupted on September 15, 2017. The volcanic rocks crystal system was performed with XRD, elemental analysis and microstructure with SEM-EDX. Volcanic rocks contain: Anorthite phase 87,11 (wt%), Triclinic crystal, lattice constant, a = 8.1742 Ã…, b = 12,844 Ã…, c = 14,204 Ã…; Quartz phase 2.26%, Hexagonal crystals, lattice constants, a = 4,799 Ã…, b = 4,799 Ã…, c = 5,379 Ã…; Cristobalite phase 7.72 (wt%), Tetragonal crystals, lattice constants a = 4,970 Ã…, b = 6,990 Ã…, c = 6,998 Ã…; Alunite phase 2.91 (wt%), Hexagonal crystals, lattice constants, a = 6,990 Ã…, b = 6,990 Ã…, c = 17,282 Ã….
Study on the Production of Bonded Magnet NdFeB and Polyvinyl Butyral Mendrofa, Mareanus; Sinuhaji, Perdinan; Muljadi, Muljadi
Journal of Technomaterial Physics Vol. 2 No. 1 (2020): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v2i1.5263

Abstract

bonded magnet is composite magnet material made by mixing magnetic powder with non-magnetic binder. The process in manufacturing bonded magnet NdFeB made by mixing powder of neodymium iron boron (NdFeB) commercial type MQP-B with a polyvinyl butyral powder using a glass beaker. The comparisons of variation in composing NdFeB magnets powders with a binder of PVB (% weight) are 98:2, 96:4, 94:6 and 93:7 of 8 grams from total mass of the sample. After mixing the powder, it is molded by using a compression molding method with 8 tons pressure for 20 minutes at curing temperature 1600C. The molded samples are conducted by characterizing the physical properties which include measurement of density, microstructure analysis using SEM-EDX and magnetic properties which include measurement of the magnetic field strength using a Gaussmeter and hysteresis curve using VSM. The result of the study shows that the addition of and binder PVB in bonded magnet NdFeB causes a decrease in the density and magnetic field strength. The best result of density and magnetic field in the manufacture of bonded magnets is obtained by the addition of 2 % binder of 5.66 g/cm3 and strong magnetic field of 1862.4 G. the score of Mr = 72.86 emu/g, Ms = 103 emu/gram, Hc = 8.490 KOe and BHmax = 5.1 MGOe was obtained on the addition of PVB 2 %.
Mechanical Properties Analysis of Medium Carbon Steel Heated at 850°C by Quenching in NaOH Solution Sitorus, Stefen; Sinuhaji, Perdinan
Journal of Technomaterial Physics Vol. 3 No. 2 (2021): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v3i2.6533

Abstract

The aim of this study is to analyze the mechanical properties of carbon steel medium by quenching in NaOH solution. Heating medium of the carbon steel in a heating furnace is 850°C. The cooling process in NaOH solution was varied in concentration of NaOH (5%, 10%, 15%, 20%, 25%), and the sample was allowed to reach room temperature (27°C). The original medium carbon steel hardness value is 9.4 HRC and the tensile strength value is 656.85 MPa, while for materials with heat treatment processes and cooling processes with different concentrations of NaOH (5%, 10%, 15%, 20%, 25%) resulted in hardness values of 57 HRC, 58.3 HRC, 58.5 HRC, 60 HRC, 57.5 HRC and tensile strength values of 728.50 MPa, 835.99 MPa, 987.26 MPa, 1035 MPa, and 855 MPa for different concentrations of NaOH (5%, 10%, 15%, 20% , 25 %). Analysis of XRD crystalline structure on medium carbon steel with intermediate carbon steel from the three highest peaks of each test sample was found that its orthorhombic crystal structure in which lattice parameters a, b, and c.
Effect of Fiber Length on The Composite Properties of Salacca zalacca Pellet Fibers – Epoxy Andreas; Sinuhaji, Perdinan
Journal of Technomaterial Physics Vol. 4 No. 1 (2022): Journal of Technomaterial Physics
Publisher : Talenta Publisher

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.32734/jotp.v4i1.6914

Abstract

Research on the effect of fiber length on the physical and mechanical properties of composite fibers has been conducted, with variations in fiber lengths of 1 cm, 1.2 cm, 1.4 cm, and 1.6 cm, each added Epoxy and Hardener 1: 1 then stirred by the Hand Lay Up method and pressed for 20 minutes at a temperature of 90ºC. The characterization of composite physical properties showed a density value of 1.1325 g/cm3, porosity by 1.53%, and water absorption by 1.33%. The physical properties of composites have met the standard SNI 03-2105-2006 and can be used as a composite replacement material. The characterization of the composite mechanical properties shows a maximum bending strong value of 25.15 kgf – 40.12 kgf, tensile strength of 11.31 MPa – 15.37 MPa, and a strong impact of 50.43 J/mm2-80.93 J/mm2 has met high impact ABS quality standards of 13.48 J/m2. All mechanical properties of the composite meet the JIS A 5905:2003 standard.
Desalination of Seawater using Pahae Natural Zeolite-Activated Carbon derived from Kepok Banana Peel (Musa paradisiaca Linn.) Susilawati; Nitsae, Merpiseldin; Sinuhaji, Perdinan; Irma, Mutia; Lubis, Hariyati; Rinaldi, Fajar; Rafly Ihsan As Siddiq, Muhammad
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.2025.10.1.56-71

Abstract

The escalating demand for freshwater due to increased global population and intensified industrial activities necessitates innovative approaches to water desalination. This study explores the efficacy of a novel composite adsorbent material consisting of Pahae natural zeolite and activated carbon derived from Kepok banana peels for seawater desalination. This research synthesizes and evaluates the composite under varying conditions to ascertain its potential as an effective adsorbent material. Characterization methods included scanning electron microscopy (SEM), energy dispersive X-ray (EDX), X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmett-Teller (BET), and salinity removal measurement. The results demonstrated that the 85:15% zeolite to activated carbon ratio exhibited the highest porosity of 61.04% and a significant water absorption capacity of 86.65%. This composition also achieved the most substantial salinity reduction, lowering the initial salinity from 27.70‰ to 18.53‰ with a removal efficiency of 33.10%. SEM analyses revealed a more porous surface morphology at 85:15% which corroborated with the higher salinity removal efficiency. BET results indicated that the optimal pore size and distribution occurred in the 85:15% composition which directly correlated with enhanced adsorption capacities. This study reports the potential of using sustainable materials such as zeolite and agricultural waste-derived activated carbon for cost effective and environmentally friendly desalination processes. The findings suggest that such composites can be tailored to improve performance and provide a viable solution to the global freshwater scarcity challenge.
Co-Authors Andreas Hariyati Lubis, Hariyati Irma, Mutia Mendrofa, Mareanus Merpiseldin Nitsae Muljadi Muljadi Rafly Ihsan As Siddiq, Muhammad Rinaldi, Fajar Sitorus, Stefen Susilawati