Bunbun Bundjali

• Bandung Institute of Technology

This work aims to study the influences of Nias Indonesia’s cacao pod husk cellulose derivative on biopolymer blend host characteristics containing methylcellulose (MC) and carboxymethyl cellulose (CMC). MC as a polymer host needs to be improved through its blending with the CMC of Nias' cacao pod husk. The blend membranes preparation was conducted...

Chemical modification of Sulfonated poly(arylene ether ketone) with carboxylate acid side chain (C‐SPAEK) membranes has been conducted through partially substitution of the 4,4‐bis(4‐hydroxyphenyl)‐valeric acid (DPA) with 4,4‐bis(4‐hydroxyphenyl)‐propane (BPA) at varies different compositions of sulfonate. FTIR and EDS analysis of the synthesized S...

This research aimed to modify the Nias’ cacao pod husk cellulose by using Microwave‐assisted Organic Synthesis (MAOS) method to produce carboxymethyl cellulose and its application as lithium‐ion batteries’ biopolymer electrolyte membrane. There were two main stages of modification of Nias’ cacao pod husk cellulose i. e. cellulose alkalization and c...

Lithium-ion batteries have liquid electrolytes, which are corrosive and volatile, that would cause leakage and explosion during the rechargeable process at high temperatures. To overcome this problem, it is necessary to change the liquid electrolyte into a solid one, namely a solid polymer electrolyte. This work has prepared the solidpolymer electr...

The efforts to find lithium-ion batteries solid polymer electrolyte with excellent characteristics have much been done with the use of ionic liquids as plasticizers in the last decade. This work aims to study the effect of 1-ethyl-3-methylimidazolium acetate, [EMIm]Ac ionic liquid incorporation with various weight percentage to the characteristics...

Liquid electrolytes in commercial lithium-ion (Li-ion) batteries are corrosive, volatile and flammable. For these reasons, solid polymer electrolyte membranes are used to replace liquid electrolytes. This research focused on the fabrication of biopolymer blend electrolyte (BBE) membranes by blending commercial methylcellulose (MC) and carboxymethyl...

The presence of salts and dissolved gas like CO2 that is carried with natural gas and crude oil along the pipeline is the main reason for corrosion and scale formation. These problems are usually resolved separately by corrosion inhibitors and scale inhibitors or acidification. Meanwhile, utilizing a compound to resolve both corrosion and scale for...

Liquid electrolytes in commercial lithium-ion (Li-ion) batteries are corrosive, volatile and flammable. For these reasons, solid polymer electrolyte membranes are used to replace liquid electrolytes. This research focused on the fabrication of biopolymer blend electrolyte (BBE) membranes by blending commercial methylcellulose (MC) and car-boxymethy...

Bacterial cellulose is a type of biopolymers and has a magnitude of applications in food, paper, and textile industries, and as a biomaterial in cosmetics and medicine. Whilst, nanocrystalline cellulose is a kind of renewable and biocompatible nanomaterials that can find the vast application in biotechnology, medicine, and various technical areas....

The separation process between 5-hydroxymethylfurfural (HMF) and trace glucose in glucose conversion is important in the biphasic system (aqueous–organic phase), due to the partial solubility property of HMF in water. In addition, the yield of HMF via the dehydration reaction of glucose in water is low (under 50%) with the use of Brønsted acid as a...

In this study, imidazole derivative-based new ionic liquids were investigated as corrosion inhibitors. These new ionic liquids (ILs) are 1,3-dipropyl-2-(2-propoxyphenyl)-4,5-diphenylimidazole iodide (IL1) and 1,3-dibutyl-2-(2-butoxyphenyl)-4,5-diphenylimidazole iodide (IL2). The corrosion inhibition effects of two new ILs were observed on carbon st...

Given the desirable outcomes to organic synthesis afforded by the use of ionic liquids, there is a need for the development of more efficient techniques for their preparation. The microwave-assisted organic synthesis technique (MAOS) has been recently utilized for preparing ILs. MAOS provides faster, easier, and less expensive synthesis processes....

Oligosuccinimide (OSI) is an oligomer with several repeating units of succinimide. In this study, OSI was synthesized by thermal condensation between maleic anhydride and ammonium carbonate. The chemical structure of the synthesized compound was confirmed by FTIR and NMR spectroscopy as well as LC-MS characterization. Evaluation of its performance...

Corrosion inhibitor is one of the materials widely known to effectively minimize damages caused by corrosion. Design and development of corrosion inhibitor have been intensively studied. Understanding the mechanisms responsible in corrosion inhibition is demanded in developing techniques to prevent corrosion. This study employed an imidazole deriva...

Ionic liquid (IL) demonstrates better performance as a solvent in the biomass conversion process than conventional organic solvents. This study focuses on the application of new hydrophobic imidazolium-based IL as a solvent in biomass conversion process. A novel IL, namely, 1,3-dipropyl-2-(2-propoxyphenyl)-4,5-diphenylimidazolium iodide ([DPDIm]I),...

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 e...

The development of portable electronic devices, especially mobile phones and notebook computers has been increasing significantly leading to a strong need of high-energy batteries. Among various types of batteries, lithium-ion batteries are the most promising answer to this requirement. Recently, the battery industry has represented one important a...

Lithium-ion batteries (LIBs) are favorable power source devices at the last two decades, owing to high energy density, rechargeable, long life cycle, portable, safe, rechargeable, good performance and friendly environment. To support their development, in this research has been successfully prepared polymer electrolyte membrane, a main component of...

Korosi mikrobial merupakan korosi yang disebabkan oleh adanya pertumbuhan mikroba. Korosi jenis ini dapat mempengaruhi dan mempercepat proses terjadinya korosi karena adanya mikroba. Pipa bawah laut merupakan salah satu material yang sering ditumbuhi bakteri penyebab korosi. Korosi akibat aktivitas mikroba dapat menyebabkan kebocoran pipa bawah lau...

Polymer electrolyte membranes of cellulose acetate-LiClO4 were prepared from the cellulose acetate with various ratios of lithium perchlorate in tetrahydrofuran (THF) as solvent. The properties of polymer electrolyte membranes with various ratios of lithium perchlorate were studied by Thermogravimetric Analysis (TGA) and Scanning Electron Microscop...

This work had successfully produced Theobroma cacao L. (TCL) husk-based cellulose used efficiently and friendly environmentally simple microwave-assisted extraction (MAE) method. The microwave-assisted heating time optimization of alkaline-treatment was carried out for 10, 20, 30 and 40 minutes. Microwave-assisted bleaching process was also conduct...

Tropical marine environment is highly corrosive to metals of construction material for marine transportation and pipelines to distribute oil and gas. Indonesia's tropical marine macroalgae have high potential and quality to be developed as a biocorrosion inhibitor for metals in tropical marine environment. This study was conducted to determine the...

Poly(urethane) (PU) as a prepolymer was prepared by polymerization of the diol compound (9-ethoxy-1,10-octadecanediol) and 4,4-methylen-bis phenyl isocyanate (MDI) under nitrogen atmosphere at 85 °C. The 9-ethoxy-1,10-octadecanediol was obtained by several reaction steps, i.e. epoxydation of oleic acid obtained from palm oil, ring-opening of oleic...

This study investigated the effect of bacterial cellulose nanocrystals (BCNCs) derived from low cost resources as reinforcing nanofiller in poly(ethylene oxide) (PEO) based nanocomposites. The nanocrystals isolated from bacterial cellulose produced from the pineapple peel waste juice as a culture medium. TEM images showed that the morphology of BCN...

The need for secondary batteries is increasing every year. The secondary battery using a liquid electrolyte has some weaknesses. A solid polymer electrolyte is the alternative electrolytes developed to replace the liquid electrolyte type. This study was conducted to determine the effect of lithium perchlorate content on the polymer electrolyte memb...

The membranes of sulfonated polystyrene, lignosulfonate and nano-silica (SPS-LS-SiO2) that contain different percentages of nano-silica (1%–5% [w/w]) were prepared and characterized for polymer electrolyte membrane fuel cell (PEMFC). Nano-silica is an inorganic compound with a surface area of 200 m2/g, and it has a hygroscopic property so that the...

Oligomer of 4-vinylpiperidine, O(4-VPP), synthesized by hydrogenation of oligomer 4-vinylpyridine, O(4-VP), was tested as a corrosion inhibitor to protect mild steel in brine solution saturated by carbon dioxide (CO2). Weight loss (wheel test), electrochemical impedance spectroscopy (EIS), and linear polarization (LP) measurements were used to dete...

In this work, the oligomer of 4-vinylpyridine designated as O(4-VP) was synthesized by hydrogen peroxide initiated chain growth polymerization and characterized in terms of molecular weight and structure by matrix assisted laser desorption ionization time of flight mass spectroscopy (MALDI-TOF MS). The oligomer was tested as corrosion inhibitor of...

Selulosa merupakan polimer alam yang sangat melimpah dan digunakansecara luas sebagai bahan mentah untuk berbagai aplikasi industri sepertifiber, kertas, membran, cat dll. Modifikasi selulosa dengan anhidrida suksinatmerupakan salah satu cara untuk memberikan nilai tambah pada selulosatersebut. Untuk meningkatkan kemampuan melarutkan dan efisiensim...

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...

In this work, the oligomer of 4-vinylpyridine designated as O(4-VP) was synthesized by hydrogen peroxide initiated chain growth polymerization and characterized in terms of molecular weight and structure by matrix assisted laser desorption ionization time of flight mass spectroscopy (MALDI-TOF MS). The oligomer was tested as corrosion inhibitor of...

Cellulose nanocrystals (CNC) were isolated by the sulfuric acid hydrolysis of bacterial cellulose (BC) produced by Gluconacetobacter xylinus using pineapple peel waste juice as culture medium. Optimal conditions of the acid hydrolysis were obtained at concentration of sulfuric acid of 50%, hydrolysis time ranging 25∼40minutes and temperature at 50°...

Cellulose is a natural polymer which is insoluble in water. Nanometer sized cellulose is known as nanocrystalline has a higher surface area than cellulose. Due to this property, it is more easily to be modified for various applications such as for reinforcing agent in lithium ion battery separator. Nanocrystalline cellulose was obtained by acid hyd...

Recently, the battery industry has represented one important and growing sector where the use of non-toxic and non-hazardous substitute materials has not rapidly developed. The environmentally friendly polymer electrolyte is required to decrease the risk of environmental pollution caused by toxic materials of battery components. Therefore, in this...

Injection of corrosion inhibitor into the fluid current of oil and gas pipelines is an effective way to mitigate corrosion rate on the inner-surface parts of pipelines, especially carbon steel pipelines. In this research, two alkylimidazolium ionic liquids, 1-decyl-3-methylimidazolium bromide (IL1) and 1-dodecyl-3-methylimidazolium bromide (IL2) ha...

The objective of this research was to study the mechanical properties of cold-worked 316L stainless steel (SS) after it has undergone the cold mechanical process. A 316L SS sheet was cold-rolled until a reduction in thickness was within the range of 10% to 50%. The sheet was then plastically deformed into a U-bend shape using a universal testing ma...

This study has successfully conducted the development method of synthesizing ethyl-1-benzyl-5-methyl-1H-1,2,3-triazoles-4-carboxylate utilizing Microwave Assisted Organic Synthesis (MAOS) method. Synthesis has been carried out in two stages. The first stage was the formation of benzyl azide (1) from the reaction between sodium azide and benzyl brom...

Electricity is a form of energy that can be easily transformed into other energy forms. The purpose of this study is to analyze the chitosan-lithium battery cells. It is found that the energy of chitosan-lithium battery cells will give decreases with the decreasing of given discharge current at a very small percentage value. The greatest energy eff...

This present paper is aims to study the influence of cold rolling process on the microstructure and corrosion behaviors of 316L stainless steel using potentiodynamics polarization testing techniques. The steel with initial thickness of 2.0 mm was unidirectional cold rolled to 10%, 30% and 50% reduction in thickness. The corrosion behaviors of the c...

Recently, the battery industry has represented one important and growing sector where the use of non-toxic and non-hazardous substitute materials has not rapidly developed. The environmentally friendly polymer electrolyte is required to decrease the risk of environmental pollution caused by toxic materials of battery components. Therefore, in this...

A model to explain the kinetics of corrosion inhibitor is proposed here. The model is based on Transition State Theory. Our model has many similarities with Michelis-Menten Kinetics. The kinetics difference between uninhibited corrosion and inhibited corrosion is presented. Our model showed the inhibitor could suppress the corrosion rate.

Electricity is the most convenient form of energy. Conversion to other form of energy from electricity is very easy. Unfortunately during the energy conversion process, there will be an energy loss. Most electricity in the Indonesia is generated at power plants that consumed coal and natural gas. These are fossil fuels that emit carbon dioxide that...

Recently, the battery industry has represented one important and growing sector where the use of non-toxic and non-hazardous substitute materials has not rapidly developed. The environmentally friendly polymer electrolyte is required to decrease the risk of environmental pollution caused by toxic materials of battery components. Therefore, in this...

Vitamin C or ascorbic acid is needed by the human body but it is already damaged by the rise in temperature due to be oxidized to L-dehydroascorbic acid. This research aims to determine the kinetics of oxidation of ascorbic acid due to an increase if temperature (40-80 °C) and to design an ascorbic acid oxidation reaction laboratory module to be ap...

Electrolyte polymer membrane widely used in PEMFC and DMFC is a perfluorosulfonated membrane such as Nafion. This membrane material exhibits good chemical stability and proton conductivity, but it is very expensive and difficult to recycle. It has high cross-over methanol in DMFC that causes the decrease efficiency and performance of fuel cell, so...

Overcoming of corrosion problem on the surface of carbon steel is still being developed until present. The recent publications showed that the corrosion inhibitor with good hydrophobic properties and strong interaction with the carbon steel surface is needed. Therefore, 3-butyl-2,4,5-triphenylimidazole and 3-butyl-2-(2-butoxyphenyl)-4,5-diphenylimi...

The influence of soft-segment prepolymers prepared through the polymerization of δ-valerolactone (VL) and 2,2-dimethyl-1,3-propandiol (DP) monomers on the structure and properties of poly(urethane-ester) as well as its biodegradability were investigated. Poly(urethane-ester) was prepared in two steps. The first step was the preparation of prepolyme...

The corrosion inhibitor of carbon steel in 1% NaCl solution by curcuminoids has been studied at 27°C using weight loss and electrochemical method. The determination of corrosion inhibition efficiency (%eff) utilising weight loss method at the concentration of 80 ppm showed the best result of 78.70% for third isolated fraction. Further determination...

Corrosion is one of the major problems in petroleum mining and processing industry. The pipelines used to transport crude oil from reservoir to the processing installation were made from carbon steel that is susceptible towards corrosion. One of the best methods to prevent corrosion that occurred at the inner parts of carbon steel pipelines is to u...

Poly(urethane-ester) was prepared by polymerization of 4,4′-methylenebis(phenyl isocyanate) (MDI) and prepolymers of ε-caprolactone and 2,2-dimethyl-1,3-propanediol monomers P(CL-DP) with various chain lengths as polyol sources. Characterizations of poly(urethane-ester) were carried out by analysis of functional groups (FTIR), thermal properties (D...

Corrosion can damage many aspects of industrial and laboratory processes. Therefore, to solve the corrosion problem need a corrosion inhibitor. This study aims to isolate protein from the foodstuffs waste which contains high protein. One of the foodstuffs waste used is tofu waste. The protein of tofu waste isolated using two methods (precipitated b...

Three derivatives of 4,5-diphenyl-1-vinylimidazole: compound 1 (2-hexyl-4,5-diphenyl-1-vinyl-1H-imidazole), 2 (2,4,5-triphenyl-1-vinyl-1H-imidazole), and 3 (2-(4-methoxyphenyl)-4,5-diphenyl-1-vinyl-1H-imidazole) have been synthesized utilizing microwave assisted organic synthesis (MAOS) method, in order to investigate the correlation between struct...

The main problem in preparation of polymer blends is compatibility between polymers mixtures with different properties. This paper describes properties of polymer blends prepared from modified polypropylene (PP) and poly-ϵ-caprolactone (PCL). The preparation of these polymer blends involves modification of PP by oxidation with hydrogen peroxide. A...

This work has investigate conditions which allow pitting corrosion of carbon steel in acetate buffered test solutions of pH 3.82, 4.12, 5.12 and 6.12, 0.2 M NaOAc and standard brine solutions, all of which contains 100 mg/L sodium bicarbonate and saturated with CO2. Corrosion rates is determined by corrosion wheel and corrosion bubble tests, while...

Diterima Maret 2004, disetujui untuk dipublikasikan Nopember 2004 Abstrak Diagram Potensial-pH, atau diagram Pourbaix, sistem Fe-H 2 O pada umumnya dikonstruksi dari hasil perhitungan berdasarkan data termodinamika. Pada pekerjaan ini diagram tersebut dikonstruksi berdasarkan hasil pengukuran potensiodinamik pada sistem baja karbon dalam larutan bu...