Bambang Sunendar Purwasasmita

• Professor
• Bandung Institute of Technology

This study aimed to evaluate the effect of incorporating nanocrystalline cellulose (NCC) sourced from rice husk on the mechanical properties of a commercial glass ionomer cement (GIC). NCC was isolated through acid hydrolysis, and its crystallinity, chemical structure, and morphology were characterized through x‐ray diffractometry, Fourier‐transfor...

Hard carbon (HC) is recognized as a promising anode material for sodium-ion batteries due to its high capacity and low operating voltage. However, the usage of polyvinylidene fluoride (PVDF) binder leads to a shortened HC cycle life because of the high reactivity of PVDF toward the carbonate ester-based electrolyte. Herein, we have reported the syn...

The research on the synthesis of nanoparticles using the high-energy ball milling method technique is limited in Indonesia. This work aims to reduce the size of the remaining biochar powder from the lignocellulosic residual forest (twig) into a nanoparticle. High-Energy Ball Milling-Ellipse 3 Dimension (HEM-E3D) was used to grind the biochar throug...

his study investigated the properties of mesocarbon anodes in the half-cell of sodium-ion batteries. The behavior of mesocarbon was examined using electrochemical methods. Cyclic voltammetry (CV) was applied with various scan rates to reveal the anodic-cathodic voltage and peak current. The CV profile allowed for predicting the energy storage mecha...

This work successfully fabricated flexible substrates made of cellulose nanocrystal-reinforced chitosan (CNC-Ch) through a simple water-based casting method. The rice husk cellulose nanocrystals (CNCs) were employed to reinforce the chitosan (Ch) matrix in the range of 10–50 wt%. The CNC-Ch substrates produced compact homogenous film with good disp...

The demand for cement is increasing each year, but the manufacture of 1 tonne of cement produces an equal number of carbondioxide (CO2) gas which is directly related to the increase in global warming. Therefore, we need a substitute material, namely geopolymer. This material has relatively superior properties compared to cement. However, one of the...

This study investigates eco-friendly membrane biocomposites derived from biomass, utilizing cellulose microfibrils (CMF) as the main membrane material. Cellulose nanocrystals (CNC), isolated from rice husk, were added as reinforcing fillers in CMF flat sheet membranes. CNC with concentrations of 0%, 10%, 20%, and 30% were employed. Scanning electro...

Composite is one of the direct dental restoration materials, which is consisted of three main components such as matrix, filler, and coupling agent. Metakaolin and zirconia are potential alternatives as dental restoration materials. This study aims to determine the characteristics of synthesized metakaolin-zirconia geopolymer nanocomposite with the...

Orthodontic treatment with fixed brackets was performed to transmit the pressure from the wire to the periodontal tissues to produce tooth movement. Ceramic material can be used not only to improve the aestheticness but also maintains good mechanical properties. This study aims to determine the mechanical properties and morphological of synthetic a...

Since the admission of batik as a world cultural heritage by the United Nations Educational, Scientific and Cultural Organization, the public interest in batik and the batik industry has been increasing. However, the problem arises when the development of the batik industry is not accompanied by batik wastewater treatment that fits the wastewater q...

Background: Polymethylmethacrylate (PMMA) is one of the synthetic polymers generally used for temporary jacket crown restorations because of its good translucency, making its aesthetic value higher, but its mechanical properties, such as hardness and flexural strength are lower than composite resins. Hence, adding zirconia and cellulose filler is n...

Ceramics is a dental material used often because of its relatively good strength and aesthetic properties. Ceramics such as zirconia, alumina, and silica have different characteristics and have been synthesized using a bottom-up method separately. Recently, many studies have used chitosan solution to help synthesize nanometer-sized ceramic material...

Solid electrolytes such as lithium aluminium titanate phosphate (LATP) are attractive for production of safer Lithium-Ion Battery (LIB). Unfortunately, exploitation of LATP as solid electrolytes in LIB is hindered by their low conductivity. Previously, higher conductivity of LATP has been prepared by sol gel method and calcined at 1000 °C. In this...

In this study, banana peel from ambon lumut (Musa acuminata) was used as source for nanocellulose fibers. Carboxylated nanocellulose was isolated with oxidation method using ammonium persulfate (APS). In order to investigate the effect of temperature towards the characteristics of nonocellulose, temperature for oxidation process was set at three di...

Nanocrystalline cellulose templated barium hexaferrite has been prepared by sol-gel auto combustion and calcination method. Nanocrystalline cellulose template of 0, 0.5%, 1.0%, and 1.5% (w/v) were used to synthesize barium hexaferrite. The XRD pattern and TEM observation reveal the crystalline phase formation of hexagonal barium ferrite. Cellulose...

Introduction: Dental implants have become a more desirable treatment for replacing missing teeth. The mechanical properties and biocompatibility of titanium and zirconia are excellent, but they are less bioactive. The chemical composition of the carbonate apatite is similar to enamel and dentin. Geopolymers are inorganic polymers, and they are simi...

Background: One of the materials for denture bases is heat-cured acrylic resin (PMMA). This material still lacks impact strength as a mechanical strength property. The addition of reinforcing material is known to increase the mechanical strength of PMMA. One of the reinforcing materials added to PMMA is nano cellulose from rice husks, one of the wa...

Sodium manganese oxide plays an important role in the cathode application of sodium ion batteries. In this study, sodium manganese oxide Na2Mn3O7 (NMO) with a triclinic structure was successfully synthesized via a low-cost, simple conventional mixing method. NaMnO materials were synthesized by mixing Na2CO3 precursors and the two different types of...

Experimental and theoretical studies of the production of lithium manganese oxide (LiMn2O4) using sol-gel method have been carried out on a larger scale than previous studies. The purpose of this investigation was to observe sample behavior along the synthesis process to be considered in further scale-up production of lithium manganese oxide, based...

Sodium ion battery is one of the promising alternatives to lithium ion battery. Sodium manganese oxide as the sodium ion battery catode material has been synthesized by modifying the sol-gel method used to obtain lithium manganese oxide. The precursors used were table salt and manganese chloride. The sol-gel process used was water solvent, citric a...

Sodium ion battery is one of the promising alternatives to lithium ion battery. Sodium manganese oxide as the sodium ion battery catode material has been synthesized by modifying the sol-gel method used to obtain lithium manganese oxide. The precursors used were table salt and manganese chloride. The sol-gel process used was water solvent, citric a...

Sodium manganese oxide plays an important role in the cathode application of sodium ion batteries. In this study, sodium manganese oxide Na2Mn3O7 (NMO) with a triclinic structure was successfully synthesized via a low-cost, simple conventional mixing method. NaMnO materials were synthesized by mixing Na2CO3 precursors and the two different types of...

Gmelina (Gmelina arborea Roxb.) is one of several species of wood found in the community forest that grows in Indonesia, especially in the West Java province. To obtain maximum benefit results from the community forest, more than timber needs to be used. Scientists need to find alternative uses for the wood bark waste. The objective of this researc...

This research reports the making of flat sheet membrane composite for desalination applications based on Bacterial Nanocellulose (BNC) from banana peel waste, wood cellulose, and silica. Silica synthesized using the sol-gel method resulted in particles range 189–227 nm in size. Characterization with FTIR further confirms the silica cluster produced...

Climacteric fruit is characterized by an increase in respiration and ethylene production when the ripening occurs. On the other hand, TiO2 was found to be able to decompose ethylene gas through its photocatalyst reaction. To optimize the photocatalyst function, we made additional semiconductors to form TiO2/SnO2. To improve the mechanical propertie...

Alzheimer is one of degenerative disease that slowly destroys memory and cognitive ability. Currently, magnetic resonance imaging (MRI) technique combined with contrast agent is widely used to detect this disease at early stage because MRI offer better safety for patient with zero long term risk. To obtain accurate result, it is favorable that cont...

Corneal damage is the second cause of blindness in the world because of lack of high quality corneal from donor. Chitosan-based scaffold might be attractive for corneal tissue because of their biodegradable and biocompatible properties. In this report, chitosan-based scaffolds were prepared by solution casting combined with salt leaching method and...

Background Electrospun nanofibers based on Colocasia esculenta tuber (CET) protein are considered as a promising material for wound dressing applications. However, the use of these nanofibers in aqueous conditions has poor stability. The present study was performed to obtain insights into the crosslinked electrospun CET’s protein–chitosan (CS)–poly...

Background: Electrospun nanofibers based on Colocasia esculenta tuber (CET) protein are considered as a promising material for wound dressing applications. However, the use of these nanofibers in aqueous conditions has poor stability. The present study was performed to obtain insights into the crosslinked electrospun CET's protein-chitosan (CS)-pol...

In this study, the effects of atmosphere firing and pre-heating treatment on the characteristics of sodium titanates were investigated. The materials were successfully prepared from titanium tetraisopropoxide-sodium chloride (TTIP-NaCl) precursors assisted by organic templates (ethylene glycol and citric acid) via facile templating and hydrothermal...

Geopolymer and carbonated apatite are potential materials for dental restoration. We reported the synthesis of geopolymer–carbonated apatite nanocomposite, highlighting the influence of trace elements in carbonated apatite toward mechanical, leachability and cytotoxicity properties. Various carbonated apatites were combined with metakaolin, followe...

The objective of this research is to investigate the characteristics of an organic nanoparticle produced from Gmelina wood bark using ball milling with liquid nitrogen treatment. In this study Gmelina wood bark was converted into nanoparticles using the ball milling method for 96 h and then filtered using four types of sieves (T77, T90, T120, and T...

This research reports the optimization of the synthesis of bacterial nano cellulose (BNC) from banana peel waste media of Kepok bananas ( Musa paradisiaca L .) using Gluconacetobacter xylinus bacteria in a fermentation process for use in water filter membrane applications. Bacterial nanocellulose (BNC) synthesis was successfully accomplished under...

In this study, x-ray diffraction investigations were carried out to evaluate the effect of the calcination atmosphere on the formation of the mineral sodium titanate at a temperature of 800°C. Sodium titanate was synthesized from titanium tetraisopropoxide and NaCl precursors assisted by templates of ethylene glycol and citric acid as chelating age...

This paper investigates the wettability of selected wood species from Indonesian community forests, namely (Indonesian name–Latin name) surian (Toona sinensis), jabon (Anthocephalus cadamba), gmelina (Gmelina arborea.), Manglid (Manglietia glauca), rubber wood (Hevea brasiliensis), and sengon (Paraserianthes falcataria). The study measures the cont...

Zirconia nanorods have been successfully synthesized from local zircon-based Zr(OH)4 precursors through a facile precursor-templating method assisted by sugarcane bagasse based-nano cellulose as the one-dimensional (1D) structure directing template. However, the 1D structure arrangement of the zirconia precursors by the cellulose template during sy...

In this study, protein in Colocasia esculenta tuber (CET) combined with polyethylene oxide (PEO) and chitosan were fabricated by electrospinning, which could be further stabilized by heat treatment and compared with glutaraldehyde vapor. CET’s protein containing 6.6% protein with molecular weight 53.5, 42, 24.4, 11.8, and 9.8 kDa shows no cytotoxic...

Root canal treatment failures generally caused by microorganisms that have ability to invade dentinal tubules. Chlorhexidine is widely known to effectively eradicate broad spectrum bacteria that infected dentinal tubules. The delivery of chlorhexidine to the infected site of root canal still becomes an issue. In order to increase the stability and...

The polyol method has been employed to fabricate a palladium-doped graphene-tin oxide composite as a highly sensitive and selective carbon monoxide gas sensor. The ratio of graphene-SnO2 which is used in this research is 1:1, while the concentration of Pd doping is varied at 0.1%, 0.5%, and 1%. X-ray diffractometry (XRD), scanning electron microsco...

Nanofibers have been prepared from the mixture of chitosan, polyethylene oxide (PEO) and Colocasia esculenta flour (CE flour) by using the electrospinning method. Two different nanofibers were formulated, containing chitosan-PEO and chitosan-PEO-CE flour. The higher concentration of PEO (3%chitosan-6%PEO) (w/v) resulted in more uniform chitosan-PEO...

Bone cement kalsium fosfat merupakan generasi terbaru material pengganti tulang. Semen ini menghasilkan hidroksiapatit yang memiliki struktur kimia dan morfologi komponen dasar yang menyerupai tulang sehingga bone cement dapat digunakan untuk memfiksasi implan gigi immediate loading dental implan yang memiliki beberapa keuntungan. Namun sifat mekan...

Bahan cetak gigi terutama alginat digunakan hampir pada semua cabang kedokteran gigi yang berfungsi menghasilkan suatu bentuk cetakan dari hubungan gigi dan jaringan rongga mulut (jaringan keras dan jaringan lunak) untuk mendapat cetakan negatif atau model dari jaringan mulut.Bahan cetak alginat harus memenuhi sifat biologis dan mekanis yang ideal....

This research reports the result obtained from the synthesis and characterization of Bacterial Nano Cellulose (BNC) from Nangka banana peel (Musa sp L.) media for water filtration membrane application. The BNC synthesis is successfully achieved under the condition of banana peel and water ratio of 1:3, bacterial nutrition : Glucose 10% (w/v), Ammon...

Nowadays, Lithium-Ion Battery (LIB) is considered as one of the most popular energy storage technologies due to their superior properties such as light-weight and high energy density. However, LIB technologies still lack of safety problem because utilization of liquid electrolytes may drive to explosion at high temperature. Thus, development of sol...

Porous Lithium Titanate (Li4Ti5O12) is one of attractive materials for safer and more stable anode of lithium-ion batteries with improved ionic conductivity. In this study, porous Li4Ti5O12 were synthesized by sol-gel method using eggshell membrane as soft template. X-Ray Diffraction (XRD) and Energy Dispersive Spectroscopy (EDS) results indicated...

One-dimensional (1D) ZrO 2 nanomaterials were successfully prepared from local zircon-based Zr(OH) 4 precursors assisted by glycols (as the 1D structure directing templates) in water-based solvent through a facile precursor-templating method. The 1D ZrO 2 nanomaterials were initially synthesized by mixing the precursors with glycols at precursor pH...

. Suralaya power plant produces fly ash about 219.000 ton per year. Fly ash contents of silica and alumina as major components that can be used as precursors for geopolymer, a three dimensional networks aluminosilicate polymers. This research aim is to utilize fly ash for geopolymer made by mixing fly ash, fine aggregate, and alkali activator in a...

Dye Sensitized Solar Cell (DSSC) merupakan suatu jenis sel surya yang termasuk dalam kelompok sel surya lapisan tipis. DSSC kini menjadi fokus utama pada riset mengenai sel surya. DSSC dimodifikasi menggunakan bahan pewarna (dyes) sebagai material dapat meningkatkan sensitivitas suatu semikonduktor terhadap cahaya. Penelitian untuk meningkatkan kua...

Barium hexaferrite is known as a permanent magnet that has hexagonal or granules morphologies. Magnetic field of barium hexaferrite can be increased by changing its morphology. A rod-shaped barium hexaferrite is expected to result in higher magnetic field compared to granules even though the volumes of both are the same. This study aims to synthesi...

Zirconia 1-D nanomaterials are promising materials that demonstrate extraordinary and unique properties that can be applied in many great fields such as electronic, medical and chemical. The present study reports the synthesis of zirconia 1-D nanomaterials from local zircon-based zirconium hydroxide hydrates mediated with polyethylene glycol 6000 a...

Introduction: Several factor limits of services of dental composite have triggered further improvement. ZrO2-Al2O3-SiO2 system as filler of dental composite had been developed with sol-gel technique. Ultrasonic homogeniser were reported to change the particle size ditribution or shape. Unifom size and distribution of particle is believed to help de...

Cellulose nanocrystals-alginate (CNC-ALG) nanocomposites were prepared as drug carriers for rutin. CNC was extracted from pineapple leaf fibers using ammonium persulfate to result in whiskers morphologies comprising carboxylate functional groups. Resulting CNC was combined with alginate and crosslinked with Ca2+ to form blank CNC-ALG with concentra...

Dalam penggunaannya sebagai light emitting diode (LED) putih, fosfor Boron Carbon Oxy-Nitride Silika (BCNO/SiO2) terus dikembangkan sebagai alternatif penggunaan fosfor dengan oksida tanah jarang. Pada penelitian ini dilakukan proses sintesis fosfor BCNO/SiO2 dengan memanfaatkan bahan-bahan alam yang mudah ditemukan di Indonesia. Prekursor yang dig...

Many researches in tissue engineering have been conducted continuously to develop the proper synthetic materials for tissue and organ substitute materials. At this research, the synthesis of hydroxyapatite membrane for bone scaffold application has been done successfully by self assembly method using eggshell membrane with surface modification as...

In this study, carbon-based advanced materials for lithium-ion battery applications were prepared by using soybean waste-based biomass material, through a straightforward process of heat treatment followed by chemical modification processes. Various types of carbon-based advanced materials were developed. Physicochemical characteristics and electro...

The metastable tetragonal zirconia is an interesting material exhibiting a high surface area and photoluminescence properties. The present work studies the characteristics of the metastable tetragonal zirconia nanoparticles that were successfully prepared from local zircon without using a template by a modified sodium carbonate sintering method, fo...

Introduction: Nanocomposite has been developed as a dental restoration. Nano-scale filler can result in high mechanical properties and good esthetic. Nanofiller materials such as partially stabilised zirconia (PSZ) has been recommended for dental use. This form of zirconia can be stabilised by the addition of several different oxides such as magnes...

In the development of gas sensors, many material based on Metal Oxide Semiconductor is often used, one of them is Tin Oxide (SnO2). SnO2is widely used for CO gas sensor because of several advantages including long life expectancy, relatively stable, high durability, resistance to corrosive gases, and good mechanical resistance. Performance improvem...

Hydrophobic textile is a type of smart fabrics. Some of it are commonly coated with small particles and finally treated by water repellent agent in terms of acquiring its hydrophobic property. This research describes how hydrophobic textile are formed from its initial form of fabrics and even yarn, which are fibers. Synthesis process was commenced...

This paper report on polyol method for Pd doped tin oxide-graphene nanocomposite thin film. XRD result shows sharp peaks at certain 2θ value and match with tin oxide, graphene, and Pd database. FTIR result shows peak from alcohol chain for –OH strong bonded absorption (3444 cm-1), also there are aldehyde and ketone which are indicated by C=O strong...

SnO2-graphene nanocomposite thick films have been successfully synthesized using polyol method. Reflux with ethylene glycol as medium was employed to produce the nanocomposite. Crystal structure characterization using X-Ray diffraction (XRD) shows the nanocomposites have good crystalinity without any impurity. Scanning electron microscopy (SEM) and...

A series of experiments is made to produce silica, mixing with tin dioxide (SnO2), and characterizing for application of waveguide device. Silica xerogels (SX) are prepared from raw materials derived from rice husks ash (RHA), which abundant in South East Sulawesi. The synthesis conditions have been optimized to obtain the ash of rice husks with th...

Air Cooled Slag and Granulated Blast Furnace Slag is a waste material from steelmaking process that not utilized, even though it rich in silica and CaO that can increase mechanical properties of building materials. Therefore, this material is potential as substitutor for geopolymer. Geopolymer is an alkali activated material consists of aluminosili...

The prospective material for implant plate required sufficient mechanical properties to maintain fracture fixation and resist physiological stress until bone healing process finished. Various problem implant plate based on metal and polymer materials when used as fixation for bone defect case induced developmental of bioceramic for implant plate ma...

Bone scaffold is one of the most important component in bone tissue engineering. Basically, bone scaffold is a biocompatible structure designed to replace broken bone tissue temporarily. Unlike conventional bone replacements, an advanced bone scaffold should be bioactive (e.g: supporting bone growth) and biodegradable as new bone tissue grow, while...

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This experiment was conducted experimentally to synthesize Calcia Partially Stabilized Zirconia (Ca-PSZ) by sol-gel method using eggshell membrane template as a composite filler. The eggshell membrane was used to produce a mesh shaped structure, which hopefully can improve the mechanical properties of the composite. Ca-PSZ filler was synthesized fr...

A study on the effect of chitosan chelating agent on the formation of spinel LiMn2O4 using sol-gel method is reported. Chitosan was added into a precursor solution containing lithium and manganese ions and then was heated at 600 °C to form spinel LiMn2O4. Chitosan chelating agent performed better in precursor solution at pH 4 than at pH 8. X-ray di...

Development of ceramic membrane for desalination is gaining interest in order to provide fresh water for human’s life. In this work, a ceramic membrane was developed by coating of porous geopolymer with nanoparticles of gamma alumina (γ-Al2O3) (Al membrane), zeolite (Z membrane), and its combination (Al-Z membrane) which were synthesized through a...

Iron foam is iron based material which is widely applied due to its unique properties. However since corrosion is also a problem for this material, coating with innert material is required in enhancing its applications. In the present research, TiO2 coating is performed on iron foam suface by sol-gel dipping method. Focus is given on the study of t...

Gas sensor performance is strongly influenced by the crystal structure, composition and morphology of the material used. In this paper, structural and morphological analysis of nanocomposite SnO2-Graphene synthesized by Sol-Gel method with the composition of 1:1, 1:2, 1:3 will be described. Analysis of the morphology and structure of nanocomposite...

Sustainable development is an integrity of multidiscipline concept combining ecological, social and economic aspects to construct a liveable human living system. The sustainable development can be support through the development of green materials. Green materials offers a unique characteristic and properties including abundant in nature, less toxi...

In this study, cotton-based cellulose was used as precursor to developed carbon nanotube–like structures through modified-pyrolysis method with iron (III) chloride hexahydrate as a catalyst. Reflux process with nitric acid was conducted to purify the resultant of carbon material. The resultant of carbon-based nanostructure were characterized system...

Putty elastomeric material is a viscous, moldable material that can be used as a dental impression to record and duplicate the tooth structure. Commercially available putty materials are hardly found in the Indonesian market. The aim of this work is to develop an alternative putty dental material from glutinous rice with two different gelling agent...

Polymethyl methacrylate (PMMA) is one of the materials used for the temporary crown while making fixed partial dentures. Unfortunately, it has low mechanical properties. This study aim's to improve PMMA hardness by adding ZrO2-Al2O3-SiO2 filler system in two different calcination temperatures. Thirty-two disc form samples with 8mm diameter x 3mm th...

p class="AbstractContent"> Background: Polymethyl Methacrylate (PMMA) permits filler reinforcements which influences the translucency properties to contribute in the aesthetic values of provisional crowns. Objective: To evaluate the translucency of PMMA reinforced with ZrO₂-Al₂O₃-SiO₂filler system in influencing aesthetics features of the crown. Me...

Black liquor is a toxic by-product from industrial pulp manufacture. It contains sodium hydroxide that can be used as precursor activator for alkali activated material, which is an aluminosilicate material that can be prepared from thermal activation of solid material containing alumina and silica as precursor and alkali activator solution. In this...

BaFe12O19 synthesis studies have been conducted based sol-gel method using chitosan as a dispersant and starch as an organic template. Starch is derived from tapioca. The test results using x-ray diffractometer (XRD) indicates the phase formed is barium hexaferrite. Based on the image of the Scanning Electron Microscopy (SEM) obtained morphology va...

A synthesis of barium hexaferrite doped Nd atom based sol-gel method using chitosan solution as a dispersant and a starch solution as a natural template was performed. As Precursors used Ba(NO3)2, Fe(NO3)3.9H2O and NdCl3.6H2O with mole ratio (1: 12:0.015). The results of the test using x-ray diffractometer showed that the phase formed is barium hex...

This study prepared Magnesium-Partially Stabilized Zirconia (Mg-PSZ) filler synthesis and direct foaming technique using egg whites, and impregnated by PMMA. The results were evaluated systematically by X-ray diffraction (XRD), Scanning Electron Microscope (SEM), and Transmission Electron Microscope (TEM). XRD results denote that the powder sample...

In this paper, we present the synthesis procedure and the results of an investigation of a novel silica xerogel (SX) glass ceramic developed from an amorphous SX derived from sago waste ash that incorporates TiO2 as an additive. The studied compositions have been prepared by adding of either 20% or 80 wt% of TiO2 into SX, respectively. The samples...

In this study, novel composites materials composed of polymethyl methacrylate (PMMA) reinforced ZrO2-Al2O3-SiO2 filler system were developed. Zirconia-alumina-silica filler system were synthesized through sol-gel technique. Chitosan and trimethoxypropilsilane (TMPS) were used to modify the composites system. The resulting composites material were c...

In this study, new dental composites materials were developed. The two composites systems composed of zirconia (ZrO2), alumina (Al2O3) and silica (SiO2) (composites A) and zirconia (ZrO2), calcium (CaO), and silica (SiO2) (composites B) were synthesized through sol-gel method. These two systems were combined with urethane dimethacrylate and tetraet...

Zr-Al-Si posts were successfully synthesized using biotemplate of eggshell membrane by sol-gel method and strengthening with matrix of polymethyl methacrylate (PMMA). The dental posts made were analyzed with the scanning electron microscope (SEM), three point bending and microvickers hardness tester. There are two methods used to synthesized Zr-Al-...

Synthesis and characterization of α-alumina nano powder with Oryza sativa pulp as template by precursor calcining process have been successfully conducted. The aim of this experiment is to study the potential of Oryza sativa pulp as a template of precursor calcining process method that isrelatively cheaper than that of sol gel method in α-alumina s...

The rich Indonesian biodiversity has been viewed as an infinite resource of naturally inspired and derived biomaterials. The utilization of these natural materials for biomaterial applications necessitates additional steps to the currently established conventional synthesis methods. Some of these steps have been successfully developed at a lab scal...

Geopolymer is an aluminosilicate material that can be prepared from thermal activation of solid material containing alumina and silica as precursor and alkali activator solution. The precursor is an eco-friendly material and has a potency to replace Portland cement (cementless material). In this work, cementless geopolymer mortar was prepared by mi...

Potential dyes to be developed derived from fermentation by Monascus purpureus. As a staple food, rice can be replace to the yam tuber lees as a substrates. The purpose of this study was to compare the dyeability between fermented rice and yam tuber by Monascus purpureus on silk fabrics at the room temperature in any different pH of dyebath. Monasc...

LiMn2O4 spinel banyak dikembangkan untuk katoda dalam baterai lithium karena memiliki kerapatan energi yang tinggi. Dalam penelitian ini, LiMn2O4 spinel disintesis menggunakan metode sol-gel dengan kitosan dan asam sitrat sebagai senyawa pengkelat. Densifikasi dilakukan pada suhu kalsinasi 600°C. Penambahan kitosan 1% (w/v) mampu meningkatkan fraks...

Geopolymer was prepared by mixing fly ash and light aggregate with silica fume, electric arc furnace dust (EAFD) slag, or red mud by addition of activator solution containing sodium hydroxide solution and waterglass to make slurry by certain ratio of binder and filler. The aim for this research is to obtain high strength geopolymer based on industr...

The brittleness behaviour of the pressed and sintered Yttria Zirconia-Mullite-Magnesia system has been studied. Specifically, the brittleness index represents a correlation of material properties for predicting mechanical properties such as for the characterization of machinability, wear or erosion resistance. The brittleness index as well as fract...

Nanoparticles of the tetragonal alumina-stabilized zirconia were synthesized from zirconium salt of ZrOCl 2 • 8H 2 O and approximately 23 wt % alumina stabilizer with ammonia as a base catalyst and sucrose as a gelling agent at a room temperature. In the preparation process of nanoparticles of alumina-stabilized zirconia, the calcination was conduc...