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All Journal Jurnal Matematika & Sains Journal of Engineering and Technological Sciences Jurnal Kimia dan Kemasan
Bunbun Bundjali
Kelompok Keilmuan Kimia Anorganik dan Fisik, Program Studi Kimia, Fakultas Matematika dan Ilmu Pengetahuan Alam, Institut Teknologi Bandung
Chemistry Engineering Mathematics

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Konstruksi Diagram Potensial-pH untuk Baja Karbon dalam Buffer Asetat secara Potensiodinamik Eksperimental Bunbun Bundjali; N. M. Surdia; Oei Ban Liang; Bambang Ariwahjoedi
Jurnal Matematika & Sains Vol 9, No 4 (2004)
Publisher : Institut Teknologi Bandung

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Abstract

The pH-potential, or the so called Pourbaix, diagram for the system Fe - H2O is normally been constructed by using thermodynamic data. In this work the diagram was constructed experimentally based on potentiodynamic measurements of carbon steel in acetic acid - acetate ion buffer solutions at a temperature range of 25-85 0C. Due to the limited pH trajectory of buffer acetate solutions the resulted diagrams were not as wide pH as those of thermodynamic Pourbaix diagrams, but they are more useful for analysing carbon steel corrosion in acetate environment systems at that temperature range. In Addition the effects of pH and temperature on the primary passive potential (Epp) and Fladge potential (EF) relationship could also be obtained.
Synthesis of Copolymers by Ring-Opening Copolymerization of δ-Valerolactone and 2,2-Dimethyl-1,3-Propandiol Monomers and Their Characterization I Made Arcana; Bunbun Bundjali; M Hasan; Helen Mariani; Shinta Dewi Anggraini
Jurnal Matematika & Sains Vol 13, No 1 (2008)
Publisher : Institut Teknologi Bandung

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Copolymers of δ-valerolactone and 2,2-dimethyl-1,3-propandiol monomers P(VL-co-DP) as raw materials in synthesisof poly(urethane-ester) were prepared by a ring-opening polymerization of 2,2-dimethyl-1,3-propandiol and δ-valerolactone monomers in various composition using 1-hydroxy-3-chloro-tetraisobuthyldistanoxane as a catalyst.Characterizations of polymers were carried out by analysis of functional groups, microstructure, viscosity, hydroxylnumber, and also thermal properties of copolymers. The copolymers of 2,2-dimethyl-1,3-propandiol and δ-valerolactonemonomers have a triblock chain structure, that is P(VL-block-DP-block-VL) with various chain lengths, which dependon VL/DP ratio used in copolymerization. The increase of δ-valerolactone composition used in polymerization leads toan increase of molecular weight and melting point as well as a decrease of hydroxyl number of copolymers.
Pengaruh Temperatur terhadap Mekanisme Inhibisi oleh Sistein pada Korosi Baja Karbon dalam Larutan NaCl Jenuh CO2 Yayan Sunarya; Cynthia Linaya Radiman; Sadijah Achmad; Bunbun Bundjali
Jurnal Matematika & Sains Vol 13, No 3 (2008)
Publisher : Institut Teknologi Bandung

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The inhibition mechanism of cysteine on API 5L X65 carbon steel corrosion in CO2-saturated NaCl solution at 300K –360K was studied. The investigations involved potentiodynamic polarization, electrochemical impedance spectroscopy(EIS) methods and computer simulation of Zview program. The results showed that the inhibition mechanism takes placethrough formation of passive layers that covers carbon steel surface with inhibition efficiency up to 85%. Functionalgroup dominantly involved in the formation process of the passive layers is –SH at low temperature, and –NH3+ athigh temperature. The increasing temperature alters the carbon steel corrosion/inhibition process from kinetics ofcharge transfer to diffusion process.
Efektivitas Asam Glutamat Sebagai Inhibitor Korosi pada Baja Karbon dalam Larutan NaCl 1% Ni Ketut Ketis; Deana Wahyuningrum; Sadijah Achmad; Bunbun Bundjali
Jurnal Matematika & Sains Vol 15, No 1 (2010)
Publisher : Institut Teknologi Bandung

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Abstract

Corrosion towards the inner parts of oilfield pipelines is one of most disturbing problems in oil and gas industries.  Amino acid and its derivatives have potent as corrosion inhibitor, including glutamic acid, which has been studied within this research project.  The effectivity of glutamic acid as corrosion inhibitor towards carbon steel in 1% (w/v) NaCl solution saturated by CO2 has been determined utilizing Tafel method with the optimization of glutamic acid concentration, pH, and temperature of tested medium.  Glutamic acid showed the highest corrosion inhibition efficiency at room temperature (26oC), which is 48.19% at the concentration of 8 ppm in 1% NaCl solution and pH 6.5.  The presence of acetate buffer solution in the medium that was being tested and at the temperature higher than room temperature has caused glutamic acid at the concentration of 8 ppm became ineffective to be applied as corrosion inhibitor.
Isolasi Nanokristalin Selulosa Bakterial dari Jus Limbah Kulit Nanas: Optimasi Waktu Hidrolisis Anwar, Budiman; Bundjali, Bunbun; Arcana, I Made
Jurnal Kimia dan Kemasan Vol. 38 No. 1 April 2016
Publisher : Balai Besar Kimia dan Kemasan

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1408.129 KB) | DOI: 10.24817/jkk.v38i1.1973

Abstract

Nanokristalin selulosa (NCC) adalah bionanomaterial yang terbarukan, berkelanjutan, ramah lingkungan, dan potensi penggunaannya sangat luas. Salah satu metode untuk mengisolasi NCC dari selulosa adalah dengan hidrolisis menggunakan asam. Waktu hidrolisis adalah salah satu faktor yang sangat menentukan keberhasilan isolasi NCC disamping konsentrasi asam dan suhu hidrolisis. Penelitian ini difokuskan untuk memperoleh waktu hidrolisis optimum untuk isolasi NCC. Selulosa bakterial (BC), yang disintesis menggunakan media kultur jus limbah kulit nanas, digunakan sebagai sumber selulosa yang murah dan ramah lingkungan. Optimasi waku hidrolisis dikarakterisasi dengan stabilitas dispersi, %-hasil, dan diameter partikel rata-rata yang diukur menggunakan Particle Size Analyzer (PSA). Waktu optimum hidrolisis yang memberikan dispersi stabil dengan %-hasil terbanyak (62%) dan ukuran partikel terkecil (diameter rata-rata 41,6 nm) adalah 25 menit pada suhu dan konsentrasi asam tertentu. Analisis FTIR memperlihatkan spektrum NCC mirip dengan BC-asal dengan puncak-puncak serapan khas untuk selulosa. Sedikit pergeseran terjadi pada puncak sekitar 2900 cm−1 dan 1430 cm−1 yang disebabkan oleh adanya peningkatan derajat kristalinitas, hal ini menunjukkan pula bahwa BC telah berubah menjadi NCC. Pengamatan dengan Transmission Electron Microscopy (TEM) terhadap NCC memperlihatkan morfologi yang berbentuk jarum. 
PREPARATION AND CHARACTERIZATION OF BIOPOLYMER ELECTROLYTE MEMBRANES BASED ON LICLO4-COMPLEXED METHYL CELLULOSE AS LITHIUM-ION BATTERY SEPARATOR Ndruru, Sun Theo Constan Lotebulo; Wahyuningrum, Deana; Bundjali, Bunbun; Arcana, I Made
Journal of Engineering and Technological Sciences Vol 52, No 1 (2020)
Publisher : ITB Journal Publisher, LPPM ITB

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Abstract

The polymer electrolyte membrane is a main component of lithium-ion batteries (LiBs), serving as separator and electrolyte. In this work, we prepared biopolymer electrolyte (BPE) membranes of lithium perchlorate (LiClO4)-complexed methyl cellulose (MC). Methyl cellulose (MC), a cellulose derivative, has attractive properties for use as biopolymer electrolyte. The bulkier anion size of lithium salt (LiClO4) significantly enhances the performance of biopolymer electrolyte (BPE) membranes. The fabricated biopolymer electrolyte (BPE) membranes were characterized by FTIR, EIS, tensile tester, XRD and TGA. Biopolymer electrolyte membranes with various weight percentages of LiClO4 salt (0%, 5%, 10%, 15%, and 20%) were prepared using a simple solution casting technique. Incorporation of 10% weight of LiClO4 into the MC-based host polymer was selected as optimum condition, because this yielded good conductivity (3.66 x 10-5 S cm-1), good mechanical properties (tensile strength 35.97 MPa and elongation at break 14.47%), good thermal stability (208.4 to 338.2 °C) as well as ease of preparation and low cost of production. Based on its characteristics it can be stated that the 10% LiClO4-complexed MC membrane meets the requirements as a candidate separator for lithium-ion battery application.
Co-Authors Bambang Ariwahjoedi Budiman Anwar Cynthia Linaya Radiman Deana Wahyuningrum Helen Mariani I Made Arcana I Made ARCANA M Hasan N. M. Surdia Ndruru, Sun Theo Constan Lotebulo Ni Ketut Ketis Oei Ban Liang Sadijah Achmad Shinta Dewi Anggraini Yayan Sunarya