Article Per Year (5 Year)
p-Index From 2021 - 2026
3.457
P-Index
This Author published in this journals
All Journal Proceedings of Annual International Conference Syiah Kuala University - Life Sciences & Engineering Chapter JURNAL PENELITIAN SAINTIKA Elkawnie Jurnal Kimia Mulawarman Padjadjaran Journal of Dentistry Lantanida Journal Abdimas Talenta : Jurnal Pengabdian Kepada Masyarakat Jurnal Pendidikan Kimia (JPKim) Indonesian Journal of Chemistry Chemistry Indonesian Journal of Chemical Research Jurnal Ilmu Fisika Journal of Saintech Transfer Denta: Jurnal Kedokteran Gigi JOURNAL OF CHEMICAL NATURAL RESOURCES (JCNaR) Jurnal Natural Jurnal Solusi Masyarakat (JSM) Jurnal Akademika Kimia Holistik Jurnal Kesehatan
Saharman Gea
Department Of Chemistry, Faculty Of Mathematics And Natural Sciences, Universitas Sumatera Utara
Agriculture, Biological Sciences & Forestry Astronomy Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Dentistry Earth & Planetary Sciences Economics, Econometrics & Finance Education Energy Engineering Environmental Science Health Professions Immunology & microbiology Languange, Linguistic, Communication & Media Law, Crime, Criminology & Criminal Justice Materials Science & Nanotechnology Medicine & Pharmacology Neuroscience Nursing Physics Public Health Social Sciences Other

Published : 32 Documents Claim Missing Document
Claim Missing Document
Check
Articles

Found 32 Documents
Search

 1   2   3   4 
PENINGKATAN SIFAT MEKANIK DAN TERMAL KAYU KELAPA SAWIT DENGAN TEKNIK KOMPREGNASI REAKTIF ., Nurfajriani; Hutabarat, Wesly; ., Thamrin; Wirjosentono, Basuki; Gea, Saharman
JURNAL PENELITIAN SAINTIKA VOL 15, NO 2 (2014): JURNAL PENELITIAN SAINTIKA
Publisher : JURNAL PENELITIAN SAINTIKA

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Characterization of Oil Palm Trunks (OPT) in height rod different OPT that compregnated with polystyrene resin modifications have been done, polystyrene resins modified with acrylic acid and benzoyl peroxide incorporated into the OPT pore size 15x2x2 cm3 shaped beam that is placed in the compregnator has been modified with -5 atm pressure for 15 minutes. Based on the tensile tests conducted showed that the optimum mechanical properties of the OPT on the bottom of the stem height. with the addition of 20% resin. Similarly, the thermal properties OPT marked increases with increasing temperature degradation of OPT compregnated modified polystyrene resin at a concentration of 20%. From the above two tests showed that OPT improved quality of prior treatment compregnation, analysis of thermal degradation by using Thermogravimetry
IbM of Small Medium Enterprise of Coconut Milk and Liquid Smoke from Coconut Shells Yusraini, Era; Halimatuddahliana; Gea, Saharman
Journal of Saintech Transfer Vol. 1 No. 1 (2018): Journal of Saintech Transfer
Publisher : Talenta Publisher Universitas Sumatera Utara

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (591.408 KB) | DOI: 10.32734/jst.v1i1.237

Abstract

Community service activities funded by BPPTN 2017 has been implemented with one of the partners, who was a small entrepreneur of coconut milk and liquid smoke from coconut shells, held from August to November 2017. Partnership of community service was Mr. Budi Darmanto, who has has his business for 9 years in Medan. The problems facing by the partner were: marketing of the coconut milk was still through the agent, resulting in the low selling price because the cost must be cut off for agent commission. In addition, liquid smoke product from coconut shells still contained impurity (Tar), classified as grade 3, causing the demand and its selling price became low. Solutions to the problems were 1) opening or enlarging the new commercial market for coconut milk, by assisting them in the handling of halal permits to the MUI of North Sumatra Province and made marketing advertisements through the website; 2) Providing a grant of liquid smoke distillation apparatus, making standard operational procedures (SOPs) to reduce impurities as well as increasing the grade of liquid smoke, to increase the selling price, and also analyzing the quality of distillated liquid smoke. The opening of commercial market of coconut milk and increasing grade of liquid smoke is expected to increase the partner’s income and expand his own business.
NANOENKAPSULASI ASAM STEARAT DENGAN MODIFIKASI GRAFENA mG/SA WALL-CORE SEBAGAI KOMPOSIT PERUBAHAN FASA Saharman Gea; Vivi Purwandari
Lantanida Journal Vol 8, No 1 (2020)
Publisher : UIN AR-RANIRY

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/lj.v8i1.6891

Abstract

The fabrication of phase-changed composite (PCC) utilized to store thermal energy through encapsulation has been performed by utilizing the stearate acid (SA) and modified graphene (mG) with sentrimoinum bromide (CTAB). The composite was fabricated via latex method, while the liquid SA was able to be encapsulated and stabilized due to the presence of mG. The active phase of SA altered to be a thermal storing site obtained from latent heat, while the mG wall has protective features which can prevent the leakage of SA core during the transition phase. The active phase itself increased the thermal conductivity from 4.93 W/mK to 7.65 W/mK with maximum storing energy for 84.8%. The stable form of mG was measured extremely low for 2 phr with an average particle size of 13.68 nm. Thus, mG wall has excellent thermal stability and effective protection in shielding the SA core which improves the thermal properties of the composite.
Nonporous Chitosan/Collagen Scaffold for Skin Tissue Engineering . Suryati; Harry Agusnar; Saharman Gea; Syafruddin Ilyas
Proceedings of The Annual International Conference, Syiah Kuala University - Life Sciences & Engineering Chapter Vol 2, No 2 (2012): Engineering
Publisher : Syiah Kuala University

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (722.182 KB)

Abstract

This study aimed to determine film characteristics of chitosan/collagen scaffold for tissue engineering applications. Scaffold prepared using freeze drying method. Surface structure and biological testing chitosan/collagen scaffold crosslinking reagent addition Glutaraldehide studied using Scanning Electron Microscopy test (SEM) and Microscope inverted. Variations in the ratio of chitosan/collagen (10:0, 8:2, 7:3, 6:4, 5:5 4:6, 3:7, 2:8, 0:10), and treated with a crosslinking reagent 0.25% of Glutaraldehyde (GA) of the total weight of the polymer. The next process dissolving and mixing, followed by printing in glass moulds (7,5x7,5) with a thickness of 5 mm. This was followed by the freezing and drying with a freeze dryer. Scaffold chitosan/collagen ratio of 80:20 and a concentration of 0.25% GA showed growth of human skin fibroblast cells most and nonporous surface structure. This study is part of a study of the processing of chitosan/collagen scaffold for applications in tissue engineering
The Effect of Chemical Activation Using Base Solution With Various Concentrations Towards Sarulla Natural Zeolite Saharman Gea; Agus Haryono; Andriayani Andriayani; Junifa Layla Sihombing; Ahmad Nasir Pulungan; Tiamina Nasution; Rahayu Rahayu; Yasir Arafat Hutapea
Elkawnie: Journal of Islamic Science and Technology Vol 6, No 1 (2020)
Publisher : Universitas Islam Negeri Ar-Raniry Banda Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/ekw.v6i1.6913

Abstract

Abstract : Material characteristics analysis of Sarulla natural zeolite (SNZ) with base activation has been carried out. The base used was NaOH at various concentrations; 0.2 M, 0.5 M, and 2 M. Base activated catalysts were characterized by X-ray Fluorescence (XRF), X-ray diffractometer (XRD), Fourier-transform Infrared (FTIR) Spectroscopy, Scanning Electron Microscopy (SEM) and gas adsorption analysis using BET method. The procedures applied have caused differences in adsorption and desorption rates as well as the crystallinity values of the catalytic materials. Moreover, the ratio of Si/Al contents has also changed at the lowest concentration. On the other hand, the crystallinity of catalysts has decreased at the highest concentration of base applied. The results are reinforced in FTIR characterization which shows the changes of silanol bonds to become silicate and aluminate. Furthermore, morphological analysis of the catalysts shows that homogenous surface was obtained at low concentration, while rough/lumpy surfaces was obtained at higher concentration.Abstrak : Analisis terhadap karakteristik material dari zeolit alam Sarulla (SNZ) dengan metode aktivasi basa telah dilakukan. Basa yang digunakan ialah NaOH dengan berbagai konsentrasi; 0,2 M; 0,5 M, dan 2 M. Katalis yang telah diaktivasi dengan basa kemudian dikarakterisasi dengan Analisis X-ray Fluorescence (XRF), X-ray diffractometer (XRD), Fourier-transform Infrared (FTIR) Spectroscopy, Scanning Electron Microscopy (SEM) dan Gas Adsorption menggunakan metode BET. Dari hasil penelitian, ditemukan perbedaan pada tingkat adsorpsi dan desorpsi, begitu juga dengan kristalinitas pada material katalis. Lebih jauh, rasio konten Si/Al juga berubah pada basa dengan konsentrasi terendah. Di sisi lain, tingkat kristalinitas dari katalis mengalami penurunan pada basa dengan konsentrasi tertinggi. Hasil ini diperkuat dengan data FTIR yang menunjukkan perubahan ikatan silanol menjadi silikat dan aluminat. Lebih jauh, analisis morfologi pada katalis menunjukkan bahwa permukaan yang homogen didapatkan dari penggunaan basa dengan konsentrasi rendah. Sebaliknya, basa dengan konsentrasi tinggi memberikan bentuk permukaan katalis yang tidak homogen serta kasar.
Isolasi dan Karakterisasi Nanokistral Selulosa dari Tandan Sawit (Elaeis Guineensis Jack) Elisa Putri; Saharman Gea
Elkawnie: Journal of Islamic Science and Technology Vol 4, No 1 (2018)
Publisher : Universitas Islam Negeri Ar-Raniry Banda Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/ekw.v4i1.2877

Abstract

Penelitian ini mengenai analisis nanokristal selulosa dilakukan secara laboratorium. Penelitian ini dilakukan untuk mendapatkan informasi karakterisasi nanokristal selulosa hasil isolasi dari tandan kosong sawit. Tahap awal yaitu isolasi α-selulosa dari tandan kosong sawit (TKS) melalui proses dilignifikasi dengan menggunakan HNO3 3,5 dan NaNO2, kemudian peoses pulping dengan NaOH 17%, dan pemutihan dengan H2O2 10%. Tahap selanjutnya yaitu isolasi Nanokristal selulosa dari α-selulosa dilakukan dengan hidrolisis asam, yaitu dengan menggunakan asam sulfat 48,84%, yang kemudian didialisis hingga diperoleh nanokristal selulosa. Nanokristal selulosa yang dihasilkan dikarakterisasi gugus fungsinya dengan menggunakan FT-IR, dan kemudian analisis morfologi dan ukuran dengan menggunakan TEM. Ukuran nanokristal yang dihasilkan yaitu 47,46 nm.
PEMBUATAN NANOKOMPOSIT POLIVINIL ALKOHOL/NANOSERAT SELULOSA YANG DIISOLASI DARI TANDAN KOSONG KELAPA SAWIT (Elaeis guineensis Jack) DENGAN METODE LEDAK UAP Dwi Indria Cherlina; Saharman Gea; Hamonangan Nainggolan
JURNAL KIMIA MULAWARMAN Vol 14 No 2 (2017)
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

The manufacture of nanocomposites polyvinyl alcohol/cellulose nanofiber isolated from empty bunch fruit palm oil has been done. The isolation process was carried out in two stages : α-cellulose from EBFPO which followed by isolation of CN from α-cellulose using steam explosion method. The process of α-cellulose hydrolisis was done using H2C2O4 11%. Nanocomposites PVA/CN were characterized by morphologycal, thermal, and mechanical analysis. FT-IR spectra show C-O-C stretch of cellulose nanofiber at 1059,99 cm-1, which indicated that there are glycoside bonding in coumpound structure. The peaks near 2900,94 cm-1 and 3348,42 cm-1 are representative of the C-H and OH groups. The result of transmission electron microscopy (TEM) image show that diameter of cellulose nanofibre around 44,6 nm. PVA/CN nanocomposites at the optimum ratio of (80:20)% showed the thermal stability around 263,48oC and tensile strength around 17,41 MPa and Young’s Modulus 0,9 GPa, and surface area was smooth and homogen.
Electrical and Thermal Conductivity of Cyclic Natural Rubber/Graphene Nanocomposite Prepared by Solution Mixing Technique Vivi Purwandari; Saharman Gea; Basuki Wirjosentono; Agus Haryono; I Putu Mahendra; Yasir Arafat Hutapea
Indonesian Journal of Chemistry Vol 20, No 4 (2020)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (408.438 KB) | DOI: 10.22146/ijc.44791

Abstract

Thermal and electrical conductivity studies of Cyclic Natural Rubber nanocomposite with graphene 1 and 2 phr (G1 and G2) and modified 1 and 2 graphenes (mG1 and mG2) have been carried out. Graphene was activated with cetrimonium bromide (CTAB), was isolated from Sawahlunto coal (Bb) by the Hummer modification method. The nanocomposite was fabricated through the mixing solution method using Xylena as a solvent. The characterizations of nanocomposites which were performed by Fourier Transform Infrared (FT-IR) and X-Ray Diffraction (XRD) reveals an interaction between graphene, CTAB and the CNR matrix. Furthermore, Scanning Electron Magnetic (SEM) and Transmission Electron Microscopy (TEM) indicate the particle size to be smaller and particle distribution is more in accordance with CTAB. Thermal analysis of nanocomposites using Differential Scanning Calorimeter (DSC) showed an increase in thermal conductivity from 3.0084 W/mK to 3.5569 W/mK. Analysis of electrical conductivity using the Two-Point Probe shows 2 phr mG (mG2) capable of increasing electrical conductivity from 0.1170 × 10–4 S/cm to 0.2994 × 10-4 S/cm.
Preparation of Biodegradable and Low-Cost Lignin-Based PVOH Carbon Fibers Prepared by Electrospinning Amir Hamzah Siregar; Aditia Warman; Mahyuni Harahap; Grace Nainggolan; Dellyansyah Dellyansyah; Saharman Gea
Indonesian Journal of Chemistry Vol 21, No 6 (2021)
Publisher : Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22146/ijc.66606

Abstract

A polyvinyl alcohol (PVOH)/lignin nanofiber was prepared by the electrospinning method as a precursor for biodegradable and low-cost carbon fibers. PVOH 15% was dissolved in water, and various concentration of lignin (5, 10, 15, 20, and 25%) was added. The presence of lignin in PVOH solution increased the viscosity and conductivity. From SEM analysis, PVOH solution produced smooth fiber, whereas the addition of lignin produced fibers in bead forms. The presence of lignin above 20% in PVOH did not produce spun-fiber. FTIR analysis confirmed that lignin was able to form hydrogen bonds with PVOH. TGA analysis showed that PVOH/lignin nanofibers had the highest residual mass, i.e., 40% at 600 °C. The morphology of the carbon fibers showed flake forms with many pores and had 58.07% carbon content.
Nitrogen-Doped Carbon Dots From Bilimbi Juice (Averrhoa bilimbi L.) Via Hydrothermal Method For Iron and Mercury Sensing Averroes Fazlur Rahman Piliang; Kerista Tarigan; Syahrul Humaidi; Diana Alemin Barus; Saharman Gea
Elkawnie: Journal of Islamic Science and Technology Vol 8, No 1 (2022)
Publisher : Universitas Islam Negeri Ar-Raniry Banda Aceh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.22373/ekw.v8i1.11813

Abstract

Abstract: Carbon dots (CDs) have been widely used in various applications, one of them being metal ion sensing. Synthesizing CDs with sensing characteristics is influenced by two factors, i.e., precursor and dopant agent. This study aims to use bilimbi (Averrhoa bilimbi) with N, N-dimethylformamide (DMF) as a nitrogen source to synthesize CDs via the hydrothermal method. The result of hydrothermal showed significant colors of CDs with and without the presence of nitrogen, and these behaviors were also confirmed by the differential absorption of the CDs, with λmax of absorption at 291 nm. FTIR spectra confirmed the presence of functional groups related to CDs, such as C-H, C=H, C=N, C=O, C-O-C, and NH2. Meanwhile, emission spectra displayed fluorescent emission at λmax 495 nm (DMF 2%) and 491 nm (DMF 4%). The ion metal sensing test showed that these two samples with 2% and 4% of DMF were sensitive to Fe3+ and Hg2+ sensing. These characteristics concluded that NCDs from bilimbi juice via hydrothermal method were able in sensing metal ions, such as Fe3+ and Hg2+.Abstrak: Karbon dots (CDs) telah banyak diterapkan pada berbagai penggunaan, salah satunya adalah sebagai alat pendeteksi ion logam. Sintesis Cds dengan kemampuan mendeteksi dipengaruhi oleh dua faktor, yaitu prekursor dan agen dopant. Penelitian ini bertujuan untuk menggunakan asam belimbing wuluh (Averrhoa bilimbi) dengan penambahan N, N dimetilformamida (DMF) sebagai sumber nitrogen sebagai bahan sintesis CDs melalui metode hidrotermal. Hasil hidrotermal menunjukkan perbedaan emisi warna dari CDs dengan dan tanpa penambahan DMF, dan karakteristik ini juga ditunjukkan dengan adanya perbedaan penyerapan panjang gelombang maksimum (λmax) di 291 nm. Spektra FTIR juga mengkonfirmasi adanya gugus fungsi terkait dengan CDs, seperti C-H, C=H, C=N, C=O, C-O-C, dan NH2. Sementara itu, emisi spekra menunjukkan emisi fluorosensi pada λmax sebesar 495 nm (DMF 2%0, dan 491 nm (DMF 4%). Pendeteksian ion logam pada kedua sampel sensitif pada ion Fe3+ dan Hg2+. Karakteristik ini menyimpulkan bahwa NCDs dari jus asam belimbing dapat digunakan sebagai alat pendeteksi ion logam dalam air, khususnya pada ion logam besi dan merkuri.
Co-Authors . Suryati ., Julinawati Abda Abda Abdul Rahman, Syarifah Nur Syed Aditia Warman Aditia, Aditia Warman Agus Haryono Agus Haryono Ahmad Nasir Pulungan Amir Hamzah Siregar, Amir Hamzah Amru Daulay Andriayani APRI H SISWANTO Ariyani, Ariyani Aththorick, T. Alief AVERROES FAZLUR RAHMAN PILIANG Averroes Fazlur Rahman Piliang Ayu, Dinda G. BASUKI WIRJOSENTONO Basuki Wirjosentono Binti Awang, Khalijah Cut Fatimah Zuhra Deddi Prima Putra Dellyansyah Dellyansyah Diana Alemin Barus Diana, Diana Alemin Barus Dwi Indria Cherlina DWI SURYANTO Eddiyanto Eddiyanto EDDYANTO EDDYANTO Elis Anggeria Elisa Putri Elisa, Elisa Julianti Era Yusraini Fachry Wirathama, Syahrinal Anggi Daulay Halimatuddahliana Fenny Aulia Girsang, Ermi Goei, Ronn Grace Nainggolan Hadi Kurniawan, Hadi Hamonangan Nainggolan Harry Agusnar I Putu Mahendra ICHWANA RAMLI Junifa Layla Sihombing Liver Iman Putra Zai Lubis, Muhammad Frassetia Lubis, Yuni Aldriani Maghfirah, Awan Mahyuni Harahap Marpongahtun Marpongahtun, Marpongahtun Mutiara Dewi Pangaribuan Nasution, Ismet Danial NONI OKTARI NUR AZIZAH Nurfajriani ., Nurfajriani Nurwijayanti Pai, Woei Wu Larry Pasaribu, Khatarina Meldawati Piliang, Averrous Fazlurrahman Prayugo, Aniza S. Rahayu Rahayu Resmi Pangaribuan Riska Riska Rizky Kurniawan Rufina Pramudita Sembiring, Beby Karina F. Situmorang, Syafrizal Helmi Slamat Tarigan Sondang Pintauli Sopan Sinamo Sovia Lenny SRI RAHAYU Syafruddin Ilyas Syahrul Humaidi, Syahrul Tarigan, Almina Rospitaria Tarigan, Kerista Thamrin . Tiamina Nasution Vivi Purwandari Vivi Purwandari Wesly Hutabarat, Wesly Yanti, Maulida Yasir Arafat Hutapea yeni absah Yuan Alfinsyah Sihombing