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All Journal Jurnal Sains Materi Indonesia Journal of Aceh Physics Society Jurnal Penelitian Sains Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat Indonesian Journal of Chemistry

Kerista Sebayang

Department Of Physics, University Of North Sumatra - USU, Jl. Bioteknologi No.1, Kampus Padang Bulan, Medan 20155

Author-ID : 375076

Agriculture, Biological Sciences & Forestry Chemical Engineering, Chemistry & Bioengineering Chemistry Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Mathematics Physics Social Sciences

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Articles

Analisis Sistem Kristal dan Unsur serta Topografi Permukaan Batu Api dengan Metode XRD dan SEM-EDS Perdinan Sinuhaji; Kerista Sebayang; Syahrul Humaidi; Susilawati Susilawati; Aditia Warman
Jurnal Penelitian Sains Vol 19, No 2 (2017)
Publisher : Faculty of Mathtmatics and Natural Sciences

Analisis Sistem Kristal dan Unsur serta Topografi Permukaan Batu Api dengan Metode XRD dan SEM-EDSPerdinan Sinuhaji, Kerista Sebayang, Syahrul Humaidi, Susilawati, dan Aditia WarmanFMIPA Universitas Sumatera Utara, Medan, Sumatera Utara, IndonesiaAbstract: A research on the analysis of the crystal system and elements as well as the surface morphology of flint with methods of XRD and SEM-EDS. Flint has a hexagonal crystal system with lattice parameters, a = 4.8850 Å, b = 4.8850 Å and c = 5.3713 Å and  =  = 90o, 120o with  = density  = 3. 957 gr/cm3. Flint from Ende-Flores NTT has elements: oxygen (O) 47.56 Mass%, magnesium (Mg) 6:42 Mass%, aluminium (Al) 5:50 Mass%, silica (Si) 30.63 Mass%, and fe-rum (Fe) 9.90 Mass% with square microstructural irregular, uniform solids.Keywords: flint, elemental composition, microstructure and crystal systemEmail: perdinansinuhaji@gmail.com

EFFECT OF Mn-Ti IONS DOPING AND SINTERING TEMPERATURE ON PROPERTIES OF BARIUM HEXAFERRITE Achmad Maulana Soehada; Kerista Sebayang; Toto Sudiro; Candra Kurniawan; Perdamean Sebayang
Jurnal Sains Materi Indonesia Vol 15, No 4: JULI 2014
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

EFFECT OF Mn-Ti IONS DOPING AND SINTERING TEMPERATURE ON PROPERTIES OF BARIUM HEXAFERRITE. Mn-Ti doped (0, 0.1, 0.4, 0.5, and 0.6 mole%-barium hexaferrite powders have been prepared from BaCO3, Fe2O3, TiO2 andMnO powder by mechanical alloying technique for 20 hours. The mixture powder were grinded and then dried at 100 °C for 24 hours, followed by calcined at 1,000 °C for 2 hours. The calcined powder was then crushed into 400 mesh (38 μm) in particle size. X-Ray Diffraction analysis was performed to determine the phase formed. The powder was mixed with 3 wt%Celuna WE -518 polymer, and compressed with applied force of 5 tons. The sintering process was done at temperatures of 1100 °C and 1150 °C for 2 hours. The microstructure of sintered samples was observed by Scanning Electron Microscope - Energy Dispersive X-Ray Spectroscopy (SEM-EDS). The magnetic properties and Reflection Loss (RL) was measured by permeagraph Magnet-Physik and Vector Network Analyzer (VNA), respectively. The results show that the remanance (Br) of samples are likely to decrease with increase in %mol of Mn-Ti and the optimum coercivity (HCJ) 4,42 kOe was achieved at 0,5 mole% Mn-Ti. The maximum reflection loss of -25,6 dB was obtained at 0,4mole%Mn-Ti with sintering temperature of 1100 °C for 2 hours. Accordingly, it can be potentially used for microwave absorption application.

PEMBUATAN ANODA Li4Ti5O12 DAN STUDI PENGARUH KETEBALAN ELEKTRODA TERHADAP PERFORMA ELEKTROKIMIA BATERAI ION LITHIUM Slamet Priyono; Mia Aulia Dhika; Kerista Sebayang
Jurnal Sains Materi Indonesia Vol 17, No 4: JULI 2016
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.17146/jsmi.2016.17.4.4175

PEMBUATAN ANODA Li4Ti5O12 DAN STUDI PENGARUH KETEBALAN ELEKTRODA TERHADAP PERFORMA ELEKTRO KIMIA BATERAI ION LITHIUM. Telah dilakukan pembuatan serbuk Li4Ti5O12 dan studi pengaruh ketebalan terhadap performa elektrokimia baterai ion lithium. Li4Ti5O12 disintesis dari bahan baku LiOH.H2O dan TiO2 dengan metode metalurgi serbuk. Lembaran elektroda dibuat dengan mencampurkan serbuk Li4Ti5O12 dengan PVDF, AB serta pelarut N-N,DMAC hingga menjadi lumpur dan dilapiskan pada Cu foil dengan variasi ketebalan 50 µm, 80 µm, dan 120 µm. Dari lembaran tersebut dibuat baterai setengah sel dengan menggunakan elektroda referensi metalik lithium dan elektrolit LiPF6. Karakterisasi yang dilakukan meliputi X-Ray Diffraction (XRD) untuk mengetahui struktur kristal dan fasa serbuk dan performa setangah sel baterai dilakukan dengan uji Electrochemical Impedance Spectroscopy (EIS), Cyclic Voltammetry (CV) dan Charge/Discharge (CD). Dari hasil pengujian XRD menunjukkan ada dua fasa yang terbentuk, yaitu fasa Li4Ti5O12 sebesar 77,3 % dengan struktur kristal cubic dan fasa TiO2 rutile sebesar 22,7% dengan struktur kristal tetragonal. Hasil konduktivitas tertinggi pada lembaran anoda dengan menggunakan Electrochemical Impedance Spectroscopy (EIS) adalah 3,66 x 10-5 S/cm pada ketebalan 50 µm. Hasil CV menunjukkan semakin tipis lembaran anoda maka semakin cepat interkalasi dan de-interkalasi. Sedangkan, hasil CD menunjukkan bahwa ketebalan lapisan mempengaruhi nilai kapasitas spesifik, semakin tebal lapisan semakin menurun nilai kapasitas spesifiknya. Kapasitas sel baterai yang baik diperoleh pada ketebalan lapisan 50 µm, dengan kapasitas charge sebesar 146,6 mAh/g dan kapasitas discharge sebesar 146,09 mAh/g

Effect of Rolling Process on Critical Temperature (Tc) in Ag/Bi1,6Pb0,4Sr2Ca2Cu3O10 Superconducting Wire with Addition of CNT Manufacture Hilda Ayu Marlina; Agung Imaduddin; Kerista Sebayang; Pius Sebleku
Journal of Aceh Physics Society Volume 7 Number 1, January 2018
Publisher : PSI-Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (330.128 KB)

Analisa pengaruh proses penarikan (rolling) terhadap suhu kritis (Tc) dalam pembuatan kawat superkonduktor Ag/Bi1,6Pb0,4Sr2Ca2Cu3O10 dengan penambahan CNT (carbonnanotube) telah dilakukakan. Kawat superkonduktor Ag/Bi1,6Pb0,4Sr2Ca2Cu3O10 dengan penambahan CNT merupakan kawat superkonduktor berbasis bismuth dengan penambahan CNT yang diselubungi Ag (Argentum), dalam penelitian ini Ag yang digunakan berdiameter awal 8 mm. Pembuatan kawat Ag/Bi1,6Pb0,4Sr2Ca2Cu3O10 dengan penambahan CNT tersebut dilakukan menggunakan metode PIT (Powder in Tube). Salah satu proses dalam metode PIT yang mempengaruhi suhu kritis (Tc) kawat Ag/Bi1,6Pb0,4Sr2Ca2Cu3O10 dengan penambahan CNT adalah proses penarikan (rolling). Dalam penelitian ini, Tc optimum didapatkan pada penarikan pertama dengan diameter kawat menjadi 5 mm dengan nilai Tconset 109,17 K dan nilai Tczero 71 K. Namun, pada penarikan kedua (penarikan berulang) hingga kawat berdiameter 2,6 mm diperoleh nilai Tconset sebesar 90 K, tetapi Tczero tidak dihasilkan. The analysis of rolling process to critical temperature (Tc) in the manufacture of Ag/Bi1,6Pb0,4Sr2Ca2Cu3O10 superconducting wire with additional CNT (carbonnanotube) has been done. The Ag/Bi1,6Pb0,4Sr2Ca2Cu3O10 superconducting wire with additional CNT is a superconducting wire based on bismuth by adding CNT shrouded by Ag (Argentum), in this study Ag used an initial diameter of 8 mm. This wire manufacture is done by using PIT (Powder in Tube) method. One of processes in the PIT method wich affect on Tc value is the process of withdrawal (rolling). In this study, the optimum Tc obtained at the first rolling with wire diameter to 5 mm with Tconset 109.17 K and Tczero 71 K. However, in the second rolling (rolling repeatedly) until the 2.6 mm diameter wire produced a value of Tconset of 90 K, but Tczero not produced. Keywords: Ag/Bi1,6Pb0,4Sr2Ca2Cu3O10, CNT, PIT method, RollingFERERENCESAbbas, M.M. et.al. 2015. “Superconducting Properties of Bi2-xSbxPb0,3Sr1,9Ba0,1Ca2Cu3O10+δ”. Journal of Applied Sciences Research. No. 22. Hal 164-172. Dadras, Y. Liu, Y.S. Chai, V. Daadmehr, K.H. Kim, Physica C 469 (2009) 55.De Bruyn Ouboter, R., Van Delft, D., Kes, P. H. 2012. “Discovery and Early History of Superconductivity”. In H. Rogalla, P. H. Kes (Eds.), 100 years of superconductivity (pp.1-29). Boca Raton, FL: CRC Press.Galvan, A. Durán, F.F. Castillón, E. Adem, R. Escudero, D. Ferrer, A. Torres, M. José-Yacamán, J. Supercond. Nov. Magn. 21 (2008) 271.Galvan, D.H., J.H.Kim., M.B. Maple, Hirata, G.A., dan E. Adem. 2000. Flux Pinning Effect of Embedded Carbon Nanotubes in Bi2Sr2CaCu2O8. Physica C, Vol : 341-348 : 1269-1270.Galvan, Shi Li, W.M. Yuhasz, J.H. Kim, M.B. Maple, E. Adem, Physica C 403 (2004) 145.Jabur, Akram R. 2012. “B2223 High Temperature Superconductor Wires in Silver Sheath, Filament Diameter Effect on Critical Temperature and Current Density”. Energy Procedia. 18. Hal 254-264.Joshua, dkk. 2016. Pembuatan Kawat Superkonduktor BSCCO-2223. Laporan Kerja Praktik.Lusiana. 2013. “Proses Pembuatan Material Superkonduktor BSCCO dengan Metoda Padatan”. Majalah Metalurgi. V 28.2.2013. Hal 73-82.Nurmalita. 2011. “The Effect of Pb Dopant On The Volume Fraction Of BSCCO-2212 Superconduntucting Crystal”. Jurnal Natural Vol. 11, No. 2.Rey, Christopher. 2015. “Superconductors in The Power Grid”. Woodhead Publishing. pp : 86.Z.Q. Yang, X.D. Su, G.W. Qiao, Y.C. Guo, S.X. Dou, F.R. de Boer, Physica C 325 (1999)

EFFECT OF PYROLYSIS TEMPERATURES ON COMPOSITION AND ELECTRICAL CONDUCTIVITY OF CARBOSIL PREPARED FROM RICE HUSK Wasinton Simanjuntak; Simon Sembiring; Kerista Sebayang
Indonesian Journal of Chemistry Vol 12, No 2 (2012)
Publisher : Universitas Gadjah Mada

The objective of this study was to evaluate the effect of pyrolysis temperatures on composition and electrical conductivity of carbosil produced from rice husk, by conducting pyrolysis experiments at three different temperatures of 200; 400; and 700 °C. The structure of the samples was characterized using Fourier Transform Infrared (FTIR) Spectroscopy and X-Ray Diffraction (XRD). The microstructure and elemental composition were characterized using Scanning Electron Microscopy/Energy Dispersive Spectroscopy (SEM/EDS), and the electrical conductivity was measured using four probe method. The FTIR analyses revealed the existence of Si-O-Si and Si-OH functional groups, but no functional groups associated with carbon, confirming the formation of carbosil. This formation of carbosil is also supported by the results of EDS analyses which show the presence of only three elements of C, O, and Si, respectively. The XRD results indicate that the carbosils are amorphous, suggesting that no transformation of carbon and silica into crystalline phase to the limit of the temperatures applied. The carbosil formation decreased with increasing of pyrolysis temperature. The microstructure of the carbosils indicates that the higher the temperature, the smaller the grain size of the samples. The values of electrical conductivity of the samples are in the range of 1.13 x 10-3 to 6.81 x 10-3/(Ω.m) with the application of 10 tones compression pressure, but the conductivities of the sample prepared at 200 °C were found to increase with increased compression pressure to six fold from 6.81 x 10-3 to 41.94 x 10-3/(Ω.m) by increasing compression pressure to 80 tones. Based on these conductivity values, the samples are considered as semiconductor, suggesting the potential use of the carbosil in semiconductor devices.

The Construction of Oven Designed by Heat Exchanger in Drying Porang at SME Coco Prima Kerista Sebayang; Herli Ginting; Andriayani Andriayani; Agus Salim Harahap
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 4 No. 2 (2019): ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

The small-medium enterprise (SME) Coco Prima has been under nurtured of LPPM USU since 2018. Ever since, it has been improving its productivity and diversifying its productivity into drying products. Currently, this SME manages porang as one of new export commodity. The problem faced by partners is a large and fast drying methodology. Porang or iles-iles are rotten raw materials that only last for three days after harvesting due to the unpleasant odors resulted more than three days, and subsequently, they cannot be processed. Drying under sunlight requires to four days reaching about 70% degree of dryness. Due to unfavorable weather conditions, the raw material becomes sweaty and moldy and produces black colour and soft textures. Therefore, a 3x3x2 cubic meter of drying oven has been constructed along with shelves and heat exchanges supported by liquid petroleum gas (LPG) gas. The heat exchange is designed accordingly to provide lower temperature in the oven, so that the air pressure within it is more efficient and less heat is wasted during reheating process. The heating is sufficient by using LPG and fan 18â€™. The oven is consisted of two layers in which between the layers are given glass wool as a heat barrier to the environment. It is also designed with a small vent exactly on the middle of the top with the intention to flow water vapour out from the vent, while the cold air is touched by that water vapour in the oven, it converts downward on the heat exchanger repeatedly. From this applied system, 750 kg iles-iles was heated within two days with a tube-of-12 kg LPG gas.

Shorting And Drying Technology Unit For Improving The Effectiveness Of Black Onion Process Kerista Sebayang; Amir Hamzah Siregar; Herty Afrina Sianturi; Erni Mirsan
ABDIMAS TALENTA: Jurnal Pengabdian Kepada Masyarakat Vol. 6 No. 1 (2021): ABDIMAS TALENTA : Jurnal Pengabdian Kepada Masyarakat
Publisher : Talenta Publisher

In 2016, the development of Gempar Tunggal Micro Small and Medium Enterprises (MSMEs) that involved in the processing of black onions began. The raw materials are obtained from the Medan City market center, but sometimes it also come from Brebes and Semarang. The goods manufacture that resulted are sold to Aceh, Kalimantan and Sulawesi. However, because it was a home industry, the manufacturing system that was developed still very simple. Therefore, some weakness were identified, in particular the percentage of damaged or defective finished goods reaching 25 percent before its sold, various levels of maturity and work processes and supervision that drained attention and energy. In addition, the cost of using electricity is also high. It was found from the literature study by the Abdimas team of USU that there are 3 parameters that affect the processing of onions, namely garlic which is sensitive to temperature, humidity and exposure period of temperature and humidity. Often, due to the unequal size of the raw onion amount, the maturity of the onions is not homogenous distributed made the bigger the raw material of the onion impacted the faster it will ripen. Another problem that found during manufacturing process is the water vapor was not completely evaporated from the furnace. Basic technology that was developed by Abdimas USU team, namely the manual gravity onion sorting and drying unit was already used by Partners in the production process. As the result, it was successfully reducing broken onions. Lastly, homogenous maturity due to dividing process the onions by scale obtained.

Co-Authors Achmad Maulana Soehada Aditia Warman Agung Imaduddin Agus Salim Harahap Amir Hamzah Siregar, Amir Hamzah Andriayani Andriayani Candra Kurniawan Erni Mirsan Herli Ginting Herty Afrina Sianturi Hilda Ayu Marlina Mia Aulia Dhika Perdamean Sebayang Perdinan Sinuhaji Pius Sebleku Simon Sembiring Slamet Priyono Susilawati Syahrul Humaidi, Syahrul Toto Sudiro Wasinton Simanjuntak

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