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INDONESIA
Jurnal Sains Materi Indonesia
Published by Badan Tenaga Nuklir Nasional
ISSN : -     EISSN : -     DOI : -
Core Subject : Science,
Materials Science & Nanotechnology
Jurnal Sains Materi Indonesia (Indonesian Journal of Materials Science), diterbitkan oleh Pusat Teknologi Bahan Industri Nuklir - BATAN. Terbit pertama kali: Oktober 1999, frekuensi terbit: empat bulanan.
Arjuna Subject : -
Articles 15 Documents
 1   2 
Search results for , issue "Vol 12, No 2: FEBRUARI 2011" : 15 Documents clear
PHASE TRANSITION IN Fe3O4 /Fe2O3 NANOCOMPOSITES BY SINTERING PROCESS Muhammad Ghufron; Malik Anjelh Baqiya; Mashuri Mashuri; Triwikantoro Triwikantoro; Darminto Darminto
Jurnal Sains Materi Indonesia Vol 12, No 2: FEBRUARI 2011
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (238.134 KB) | DOI: 10.17146/jsmi.2011.12.2.4600

Abstract

PHASE TRANSITION IN Fe3O4/Fe2O3 NANOCOMPOSITES BY SINTERING PROCESS. Fe3O4 powders have been successfully produced by using coprecipitation method. The characterization using X-Ray Diffraction method resulted in the size of Fe3O4 powders of 9.1 ± 0.3 nm. Samples were then formed into pellete and powders. Heat treatment at temperature 600 oC of powder samples for 1 hour and 2 hours give maghemite and hematite phases, but heat treatment at temperature 700-800 oC for 1 hour, 2 hours and 3 hours give only one phase namely hematite. Heat treatment at temperature 600 oC, 700 oC and 800 oC of pelletes for 1 hour, 2 hours and 3 hours give also only one phase which is hematite. Quantitative analysis using MAUD program resulted in Fe3O4/Fe2O3 composites with changing crystal size at increasing temperature.
INFLUENCE OF HYDROXYPROPIL METHYLCELULLOSEAND PECTIN MATRIX ON THE SOLUBILITY PROFILE AND CRYSTAL STABILITY OF THEOPHYLLINE Yoga W. Wardhana; Mulyadi G. Tedjasaputra
Jurnal Sains Materi Indonesia Vol 12, No 2: FEBRUARI 2011
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (562.278 KB) | DOI: 10.17146/jsmi.2011.12.2.4605

Abstract

INFLUENCE OF HYDROXYPROPIL METHYLCELULLOSEAND PECTIN MATRIX ON THE SOLUBILITY PROFILE AND CRYSTAL STABILITY OF THEOPHYLLINE. Humidity is one of a factor affecting drug stability. Theophylline is a good sample which easily modified by humidity. In this study, we investigate the effect of polymer matrix of hidroxypropyl methylcelullose (HPMC) and pectin to inhibit the humidity-caused crystal stability changes of theophylline. Theophylline anhydrous (Ta) and mixture of Ta and matrix (80 : 20, 70 : 30 and 60 : 40) were used as the object of the study. The mixture was pressed to tablets using a Single Punch 12 mm flat E. Korsch machine. Humidity exposure was performed using a desiccator in room temperature (27 oC), with 94 % of relative humidity for 3 weeks of storage. The ability of matrix in inhibiting the change of Ta to theophylline monohydrate (Tm) was determined by comparing the result of dissolution test and X-Ray diffraction patterns from material test before and after humidity exposure. The results suggest that both polymers inhibited the changes of Ta to Tm. However, pectin was more superior than HPMC in inhibiting the hydration.
ACTIVATION AND PURIFICATION OF BENTONITE FOR THE TREATMENT OF CRUDE PALM OILAS VEGETABLE OIL Tutun Nugraha; Yestine Yuliantina; Supandi Suminta
Jurnal Sains Materi Indonesia Vol 12, No 2: FEBRUARI 2011
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (275.187 KB) | DOI: 10.17146/jsmi.2011.12.2.4596

Abstract

ACTIVATION AND PURIFICATION OF BENTONITE FOR THE TREATMENT OF CRUDE PALM OILAS VEGETABLE OIL. Crude Palm Oil (CPO) to be used for cooking oil requires processing that includes bleaching step which is typically done using bleaching earth made from activated bentonite. Bentonite is a type of mineral that is very rich in montmorillonite. Currently, substantial amount of activated bentonite used by vegetable oil industries are imported. In this research, the bentonite was obtained locally from the region of Leuwiliang (Bogor, West Java). The bentonite was purified using solution of sodium-hexa-metaphosphate (NaPO3)6, and was activated using acid reflux methods (H2SO4, 100 oC). The bentonite activation was done at two different reflux times (1 and 3 hour), and three different acid concentrations (1 M, 2.5 M and 5 M). To assist the interpretation of results, the bentonite samples were also studied using XRF and XRD. Bleaching power of active bentonite was initially studied using adsorption of methylene blue for optimation, which was followed by bleaching of CPO. The results showed that, the purified bentonite and activated at 1 molar H2SO4 for 1 hour duration, had the highest bleaching capacity. In addition, the treated oil also showed substantial reduction of peroxide number, and also some reduction of free fatty acid content (FFA) which further improve the quality treated palm oil.
THE INFLUENCE OF MASTICATION TO CURING CHARACTERISTIC OF NATURAL RUBBER AND PHYSICALPROPERTIES OF ITS VULCANIZATES Abu Hasan; Rochmadi Rochmadi; Hary Sulistyo; Suharto Honggokusumo
Jurnal Sains Materi Indonesia Vol 12, No 2: FEBRUARI 2011
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (50.906 KB) | DOI: 10.17146/jsmi.2011.12.2.4590

Abstract

THE INFLUENCE OF MASTICATION TO CURING CHARACTERISTIC OF NATURAL RUBBER AND PHYSICALPROPERTIES OF ITS VULCANIZATES. The research on the mastication that influences the curing characteristic of natural rubber and physical properties of its vulcanizates has been conducted. The research started from rubber mastication with variation of carbon black filler addition into rubber compound. Rubber compound was then measured to identify its curing characteristic using rheometer and tested its viscosity using Mooney viscosity tester. Physical properties of rubber vulcanizates such as abrasion resistance, tear strength, and elongation at break were also measured. The results indicated that curing characteristic tended to decrease, while only scorch time tended to increase from B1, B2, B3 and B4. Elongation at break tended to decrease, while tear resistance and abrasion resistance tended to increase from B1, B2, B3 and B4. Mooney viscosity of the compound also tended to decrease. It can be concluded that B1 is better than B2, B3 and B4. However, if rubber vulcanizates require high tear resistance and abrasion resistance, such as for shoes sole and tread of tire, then B4 is the most appropriate vulcanizate.
INVESTIGATING THE NANOCRYSTALLINITY OF SOL GEL DERIVED TiO2 NANOPARTICLES UPON ANNEALINGAND POST HYDROTHERMAL TREATMENTS Akhmad Herman Yuwono; Alfian Ferdiansyah; Arif Rahman; Wulandari Handini
Jurnal Sains Materi Indonesia Vol 12, No 2: FEBRUARI 2011
Publisher : Center for Science & Technology of Advanced Materials - National Nuclear Energy Agency

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (67.6 KB) | DOI: 10.17146/jsmi.2011.12.2.4601

Abstract

INVESTIGATING THE NANOCRYSTALLINITY OF SOL GEL DERIVED TiO2 NANOPARTICLES UPON ANNEALINGAND POST HYDROTHERMAL TREATMENTS. The present study is aimed at investigating the major factor causing the low nanocrystallinity nature of the sol gel derived TiO2 nanoparticles. For this purpose, TiO2 nanoparticles of different nanocrystallinity was synthesized by various hydrolysis ratio (Rw) of 0.85; 2.00 and 3.50 upon sol solution preparation, followed with subsequent drying, conventional annealing and post-hydrothermal treatments. The resulting nanoparticles were studied by dynamic light scattering, XRD and FT-IR spectroscopy which confirm that the highly amorphous state of TiO2 is related to the fast development of stiff Ti-OH networks during hydrolysis and condensation upon sol gel process. A post hydrothermal treatment involving high-pressure water vapor has been successfully devised to enhance the nanocrystallinity of TiO2 nanoparticles. It has been found in this study that Rw value of 2.00 was the optimum hydrolysis ratio during sol solution preparation of TiO2 precursor to result in the most enhanced nanocrystallinity as represented with the biggest crystallite size of 12.46 nm.

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