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All Journal JURNAL KIMIA SAINS DAN APLIKASI PROSIDING SEMINAR KIMIA Jurnal Kimia Mulawarman E-Dimas: Jurnal Pengabdian kepada Masyarakat ALCHEMY Jurnal Penelitian Kimia Akta Kimia Indonesia Chemistry Indonesian Journal of Chemical Research Molluca Journal of Chemistry Education (MJoCE) AKM: Aksi Kepada Masyarakat
Allo, Veliyana Londong
Jurusan Kimia, Fakultas Matematika Dan Ilmu Pengetahuan Alam, Universitas Mulawarman
Religion Humanities Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Decision Sciences, Operations Research & Management Education Energy Engineering Environmental Science Materials Science & Nanotechnology Social Sciences Other

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Journal : PROSIDING SEMINAR KIMIA

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A MINI REVIEW: STUDI KOMPUTASI TERHADAP STRUKTUR ELEKTROLIT PADA SILICENE, GRAPHENE, DAN GERMANENE Harvina, Harvina; Gunawan, Rahmat; Allo, Veliyana Londong
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Research on two-dimensional (2D) materials such as graphene, silicene, and germanene has garnered significant attention due to their unique electronic and mechanical properties. This mini review employs Density Functional Theory (DFT) to compare the electronic properties of these three materials. The results show that graphene, with sp² hybridization, possesses outstanding electrical conductivity and high mechanical strength, with a lattice constant of 2.46 Å. Silicene and germanene, composed of silicon and germanium atoms respectively, exhibit higher surface reactivity and potential for advanced electronic applications due to their ability to open band gaps through various methods. Silicene has a lattice constant of 3.90 Å and an electronegativity of 1.9, while germanene has a lattice constant of 3.97 Å and an electronegativity of 2.01. The band structures of silicene and graphene do not exhibit band gaps, with dominant states in the p orbital, whereas germanene displays semiconductor behavior with a zero band gap opening at the K-point. Graphene shows high in-plane stiffness, while silicene and germanene have respective stiffness, with graphene and silicene being brittle and germanene being ductile. This study provides insights into the fundamental differences in the electronic properties of graphene, silicene, and germanene, as well as their potential applications in semiconductor technology and high-speed, low-energy electronic devices. Keywords: Silicene, Graphene, Germanene, DFT, Electronic structure
ANALISIS TERMOGRAVIMETRI Spirulina platensis DENGAN KATALIS Ni/Al-SBA-15 RASIO Si/Al=10 MENGGUNAKAN LAJU PEMANASAN 10°C/MENIT Anisa, Nia Nur; Subagyono, R.R. Dirgarini Julia Nurlianti; Allo, Veliyana Londong
PROSIDING SEMINAR KIMIA Vol 3 No 1 (2024): Prosiding SNK 2024
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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The thermogravimetric analysis of Spirulina platensis with Ni/Al-SBA-15 catalyst (Si/Al ratio = 10) using a heating rate of 10°C/min has been conducted. This study was performed to determine and analyze the chemical decomposition process of Spirulina platensis with a pyrolysis heating rate of 10°C/min. Based on the characterization results, Spirulina platensis has a moisture content of 8.34% and an ash content of 7.18%. The TG and DTG curves show the active pyrolysis temperature range of Spirulina platensis microalgae with Ni/Al-SBA-15 catalyst between approximately 155-496°C. The chemical decomposition of Spirulina platensis with Ni/Al-SBA-15 catalyst occurs in three stages: 1. water evaporation, 2. active pyrolysis, where the decomposition of carbohydrate, protein, and lipid compounds takes place, and 3. passive pyrolysis caused by gasification and the formation of non-volatile carbon compounds that vaporize to form CO and CO2 gases at high temperatures. Keywords: Thermogravimetry, Spirulina platensis, Pyrolysis, Ni/Al-SBA-15
ANALISIS KOMPOSISI KIMIA PRODUK PIROLISIS LAMBAT OFF-GRADE RUBBER PADA SUHU 300 °C Agustina Tri Putri Sitinjak; RR Dirgarini Julia Nurlianti Subagyono; Veliyana Londong Allo; Ari Susandy Sanjaya
PROSIDING SEMINAR KIMIA Vol 4 No 1 (2025): Prosiding SNK 2025
Publisher : Jurusan Kimia Fakultas Matematika dan Ilmu Pengetahuan Alam Universitas Mulawarman

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Abstract

This study was conducted to determine the yield and chemical composition of slow pyrolysis products of off-grade rubber at 300 °C. From the pyrolysis experiments, the yield of bio-oil was 28.25%. Analysis with Gas Chromatography-Mass Spectrometry showed that the bio-oil from off-grade rubber was mainly composed of γ-Elemene, 1H-Benzocycloheptene, octahydro-3,5,5-trimethyl-9-methylene-, (4aS-cis)-, 1,5-Cycloundecadiene, 8,8-dimethyl-9-methylene-, Geranyllinalool Isomer B, and Geranylgeraniol.   Keywords: Slow Pyrolysis, Off-grade Rubber, bio-oil, GC-MS
Co-Authors Ade Putri Wahyuni Agustina Tri Putri Sitinjak Anisa, Nia Nur Ari Susandy Sanjaya, Ari Susandy D J N Subagyono Digva Willyan Djihan Ryn Pratiwi, Djihan Ryn Evi Mardiani, Evi Fitriah, Nur Azizah Gunawan, Rahmat Halimatus Sa'diyah Harvina, Harvina Husna Syaima Irfan Ashari Hiyahara Irfan Ashari Hiyahara Maahury, Mirella Fonda Manawan, Maykel Maykel Manawan Moh Syaiful Arif Muhammad Abdulkadir Martoprawiro Muhammad Irvan Mulya Pratama Nana Lestari Nanang Tri Widodo Noor Afdaliah Noor Hindryawati Praskianto, Ahmed Iqbal Putri, Dini Hariyanto R R Dirgarini Julia Nurlianti Subagyono Rachmawanti, Octaviana Rahmah, Siti Rahmat Gunawan Rahmat Gunawan RAHMAT GUNAWAN Rahmat GUnawan Rahmat Gunawan RR Dirgarini Julia Nurlianti Subagyono RR Dirgarini Julia Nurlianti Subagyono RR Dirgarini Julia Nurlianti Subagyono Rudy Agung Nugroho Siti Sarah Subagyono, R. R Dirgarini J.N. Subagyono, R.R. Dirgarini Subagyono, R.R. Dirgarini Julia Nurlianti Subagyono, RR Dirgarini Julia Nurlianti Three Uli Sevilla Sitohang Wardina Masdalifa