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SYNTHESIS OF MAGNETIC MATERIALS PSEUDOBROOKITE Fe2TiO5 FROM LOCAL RESOURCES OF MINERAL Sardjono, Prijo; Adi, Wisnu Ari; ., Sudirman
Jurnal Sains Materi Indonesia Vol 14, No 3 (2013): April 2013
Publisher : BATAN

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Abstract

The synthesis and characterization of magnetic materials pseudobrookite Fe2TiO5 from local resources of iron sand has been performed. Iron sand mineral is obtained from the coast of Banten. Iron sand is prepared by mechanical milling technique to obtain a small particle size. Then sand iron is carried out leaching and magnetic seperator to separates non-magnetic impurities. And then the separation results with magnetic separator is added TiO2 according to the rules of stoichiometric tomade magneticmaterial pseudobrookite Fe2TiO5. Synthesis of pseudobrookite Fe2TiO5 use solid state reaction through a process of mechanical milling and sintered at a temperature of 1000 °C for 5 hours. Refinement results of X-Ray Diffraction pattern showed that the magnetic material pseudobrookite Fe2TiO5 has been formed of good with the crystal structure of orthorombic (space group C m c m), lattice parameters a = 3.7233(5) Å, b = 9.774(1) Å and c = 9.968(1) Å, α = β = γ = 90o, the unit cell volume of V = 362.8(1) Å3 and atomic density of ρ = 4.178 g.cm-3. The measurement results of the magnetic properties indicate that the pseudobrookite Fe2TiO5 is soft magnet, and had coercivity field and remanence magnetization are 461 Oe and 0.2 emu/g, respectively. We concluded that this study has successfully made a magnetic material pseudobrookite Fe2TiO5 from local resources of iron sands.Keywords: Iron sand, Magnet, Pseudobrookite, Fe2TiO5, Crystal structure, Microstructure
SYNTHESIS AND CHARACTERIZATION OF PHOTONIC MATERALS SiO2 Maulana, Alan; Insani, Andon; Hafid, Irfan; ., Sudirman
Jurnal Sains Materi Indonesia Vol 14, No 2 (2013): Januari 2013
Publisher : BATAN

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Abstract

Synthesis and characterization of photonic material SiO2 has been carried out. The aplication of photonic materials in the microelectronics field are promising the data transmission by using opticalwave which can reduce the resistancy significantly. By using the photonic materials, fast signal processing could be achieved and the use of power supply could be decreased. The material was prepared by Stober process which characterized by The X-Ray Diffraction and Scanning Electron Microscope (SEM). The X-Ray Diffraction and SEM characterization showed that the SiO2 in the form of amorf structure and the shape of particle is sphere with the size about 350 nm. Keywords: Photonic materials, SiO2, Stober process, Particle size
ANALISYS OF SUCRALFATE MATERIAL FOR THE DRUG OF GASTRIC MUCOSAL CYTOPROTECTION Paramita, Defertha Ayudia; Wardhana, Yoga Windhu; A., Wisnu A.; ., Sudirman
Jurnal Sains Materi Indonesia 2012: Desember 2012 - Edisi Khusus
Publisher : BATAN

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Abstract

The synthesis and characterization of sucralfate material for the drug of gastric mucosal cytoprotection has been performed. The sucralfate is an aluminum salt of sucrose sulfate. In the atmosphere of an empty stomach, the drug will form a thick paste selectively. And bind to the ulcer/wound stablily between the drug molecules to proteins on the surface of the ulcer. The sucralfate calcined at 100 °C, 300 °C, and 500 °C. The purpose of this studywas knowand understand the influence of calcination temperature on the ability to neutralize and Sucralfate in maintaining gastric pH, may also improve the quality of Sucralfate is mucoadhesive. The characterization of samples included analysis phase and the degree of crystallinity, acid neutralizing capacity test, test of the ability to maintain gastric pH, and test mucoadhesive. We concluded that the sucralfate material that has the ability to neutralize gastric pH and maintain the highest quality and have a good mokoadhesif is the sucralfate is calcined at a temperature of 100 °C with the characteristics of the phase contain Bayerite and diaspore phase, the degree of crystallinity of 65.46%, has the ability to neutralize the acid at 17.44786 (UPH value XVII), capable ofmaintaining pH ≥ 3 for 33 minutes, and have a good mucoadhesive quality. Thus, the sucralfate was expected to bemore effectively used as a drug of gastricmucosal cytoprotection.Keywords: Sucralfate, Calcination, Phase, Netralization, Gastric pH and Mucoadhesive.
THE EFECT OF CALCINATION TEMPERATURE ON TOXIN ADSORPTION MATERIALS FOR DIARRHEAL DISEASES Primandini, Priska; Hasanah, Aliya Nur; Adi, Wisnu Ari; Budianto, Emil; ., Sudirman
Jurnal Sains Materi Indonesia Vol 13, No 3 (2012): Juni 2012
Publisher : BATAN

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Abstract

The synthesis and characterization of kaolin as a toxin adsorption material for diarrheal diseases has been performed. Adsorption ability is one important factor in determining the effectiveness of the adsorbent. Each adsorbent has different strengths depending on the adsorption capacity of each. The kaolin has been calcined at 400 °C, 600 °C, and 800 °C. The purpose of this study was to examine the changing character of the kaolin after calcination on the adsorption capacity. The characterization of samples includes the analysis phase, density test, porosity test, and the adsorption test of metal timbale as a medium toxin. We concluded that the kaolin has the highest adsorption capability level is a kaolin has been calcined at 400 °C with characteristic are kaolinite phase containing, degree of crystallinity of 76.59 %, has a density of 2.6275 g/ mL, the optimum porosity of 75 %, and the adsorption capacity of lead metal of 99.7325 %. The adsorption capacity of kaolin have been calcined at 400 °C is much better than the kaolin without calcinations and expected to be more effectively used to cure diarrhea.Keywords: Kaolin, Calcination, Phase, Density, Porosity, Adsorption.
HYDROGEL SUPERBASORBENT POLY(ACRYLAMIDE-CO-ACRYLICACID)-CHITOSAN PREPARED BY GAMMA RADIATION FOR ADSORPTION OF Cu2+ AND Fe3+ METALIONS ., Erizal; Abidin, Zainal; ., Deswita; ., Sudirman
Jurnal Sains Materi Indonesia Vol 12, No 3 (2011): Juni 2011
Publisher : BATAN

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Abstract

Hydrogel superabsorbent of poly(acrylamide-co-acrylic acid) (poly(AAm-ko-AA)) containing chitosan have been prepared by gamma radiation. The use of chitosan was intended to enhance the ability of hydrogels for metal ions adsorption. Acrylamide-acrylic acid (10/15 vol.%) solution mixture with varying chitosan concentration (0,05-0,2 wt%) was exposed to gamma radiation at a single dose 20 kGy (dose rate 10 kGy/h). Gel fraction, swelling ratio, Equilibrium Degree of Swelling (EDS), and the ability of hydrogels at weight ranged of 0-150 g in maximum swelling conditions in absorption Cu2+ and Fe3+ ions (20.000 ppm} have been studied. The result showed that gel fraction decreased from 93 % to 90 % and swelling ratio increased 30-100 g/g at intervals 20-210 minutes with increasing chitosan concentration (0,05-0,20 %). EDS increased from 300 to 600 g/g at intervals 24-72 hours. With increasing weight of hydrogel up to 150 g at maximum chitosan concentration (0.20%) can absorb Cu2+ and Fe3+ ions up to 90 % (~18.000 ppm) at 10 min for each observation of the weight effect on adsorption capacities. The capacity of hydrogels on adsorption Cu2+ and Fe3+ ions at weight ranged 10-50 g was liniear and adsoption rate on Cu2+ ions was lower than Fe3+ ions. The hydrogel structures changed from swollen to shrinked state after metal ions adsorption. Hydrogel poly(AAm-co-AA)-chitosan with absorption capacity in swollen state potentially can be used as an absorbent heavy metal ions pollutant in high concentration.Keywords: Superabsorbent, Irradiation, Chitosan, Adsorption, Metal ions.
SYNTHESIS AND CHARACTERIZATION OF NATURAL RUBBER-SILICA COMPOSITE Gunawan, Indra; ., Hildayati; ., Sudirman; Budianto, Emil
Jurnal Sains Materi Indonesia Vol 12, No 2 (2011): Februari 2011
Publisher : BATAN

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Abstract

The composite of natural rubber-silica have been developed with a combination of silica (SiO2)particles in irradiated natural rubber. This research was conducted with the aim to composite material with irradiated natural rubber as the matrix and silica particles as filler and to study the distribution of silica in the matrix as well as mechanical and physical properties. The results showed that the SiO2 particles homogenously distributed across the surface of natural rubber matrix as the cluster. The particles are arranged as a cluster by using 3-aminopropyltriethoxysilane (APTES) as a coupling agent. Tensile strength, tensile modulus and elongation at break of composite materials have increased as the addition of SiO2 on the composition of 9 to 12 percent weight in natural rubber. Additions of SiO2 composition in the matrix will also increase the hardness of the composite. Structural analysis were performed using FT-IR and SEM. Composite of natural rubber-SiO2 have a great potential to be applied as a natural rubber base materials mainly as protective products with higher performance.Keywords: Natural rubber, Silica, Composite, Coupling agent.
SYNTHESIS AND CHARACTERIZATION OF POLYPROPYLENE COMPOSITE POLYMER WITH TAPIOCA FILLER FOR PACKAGING MATERIALS ., Deswita; Karo, Aloma Karo; Sulungbudi, Grace Tj.; ., Sudirman
Jurnal Sains Materi Indonesia Vol 12, No 1 (2010): Oktober 2010
Publisher : BATAN

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Abstract

Synthesis of biodegradable composite polymer by adding tapioca meal as filler to a thermoplastic polymer has been done using blending method. The thermoplastic polymer used in this research is a polypropylene with melt flow 10 (PP10), and 35 (PP35). The composition of tapioca were 50, 55, 60, 65,70 and 75% w/w. Sample characterization carried out involved mechanical testing, thermal analysis, microstructure analysis and the biodegradability test. The tensile strength test result shows that the mechanical property of the sample decreases with the increasing of filler content, while the thermal analysis result shows that the melting point of the sample does not show the significant change. The microstructure result shows that between thermoplastic and filler inside the composite polymer was mixed homogeneously for composition of the filler under 50 percent. For the filler composition greater than 50 percent, the filler was not mixed homogeneously but tend to agglomerate. From biodegradability test result seen that both of the polymer composite of polypropylene sample namely, PP10-Tapioca, and PP35-Tapioca can be used as environmental friendly packaging materials.Keywords: Composite polymer of polypropylene, Tapioca meal, Friendly environment, Biodegradability.
EFFECT OF FREEZE THAWING TECHNIQUE AND GAMMA IRRADIATION TO RESORCINOL RELEASE FROM MATRIX OF POLYVINYL ALCOHOL ., Erizal; ., Darmawan; A., Basril; ., Sudirman
Jurnal Sains Materi Indonesia 2012: Desember 2012 - Edisi Khusus
Publisher : BATAN

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Abstract

Hydrogels are polymers with three-dimensional structure that useful to immobilize drugs as sustained release system. Immobilization of resorcinol in the polyvinyl alcohol hydrogel (PVA) is prepared by combination of freeze thawing (1-3 cycles) and gamma irradiation (10-30 Gy). The chemical structure of hydrogels was characterized by Fourier Transform- Infra Red (FT-IR) spectrophotometer. Gel fraction and water absorption were measured by gravimetry. The release of resorcinol was determined by Ultraviolet-Visible (UV-Vis) spectrophotometer. The results of evaluation showed that by increasing the number freeze-thawing up to 3 cycles and irradiation dose to 30 kGy, the gel fraction can reach up 95 %. In contrast, the water absorption of hydrogels decreases from 600 % to 200 %, and the decreasing release profile of water absorption of hydrogels (at the same condition) was similar with the release profile of resorcinol from 88 % to 59%. The combination of freeze-thawing and gamma irradiation can be considered as one of the immobilization techniques for sustained drug release.Keywords: PVA, Hydrogel, Resorcinol, Irradiation, Freezing thawing.
MECHANICAL PROPERTIES, MICROSTRUCTURE AND MAGNETIC PROPERTIES OF COMPOSITE MAGNET BASE ON SrO.6Fe2O3 (SrM)-THERMOPLASTIC AND THERMOSET POLYMER Sulungbudi, Grace Tj.; Karo, Aloma Karo; ., Mujamilah; ., Sudirman
Jurnal Sains Materi Indonesia Vol 12, No 1 (2010): Oktober 2010
Publisher : BATAN

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Abstract

The use of magnets in industrial applications do not always require high magnetic properties. Therefore, the use of polymer as a matrix that serves as a binder can be applied to obtain lightweight, flexible and cheap compositemagnet. This report discuss composite magnet base on SrO.6Fe2O3 (SRM)-thermoplastic and thermoset polymer. Thermoplastic polymer consist of polypropylene (PP) type of PP2 and PP10 and polyethylene (PE) type of LDPE were used. For thermoset polymer, epoxy and polyester were used. Synthesis of composite magnet based on thermoplastic polymer (PP2, PP10, LDPE) were carried using the blending method, while the thermoset composites magnet using casting method. Thermoplastic composite magnets were prepared with compositions of 50, 41, 38, 33 and 29 %weight of SRM with the blending temperature of 160 °C for LDPE and 180 °C for PP2 and PP10. For thermoset composite magnets, the compositions were 30, 40, 50 and 60% by weight of SRM. The mechanical test conducted include tensile strength and elongation at break. Microstructure on the surface of the composite materials were observed using SEM (Scanning Electron Microscope) and the magnetic properties were measured using VSM (Vibrating Sample Magnetometer). The SEM results showed the formation of flat shape powder particle with size of 1.6 µm. In general, the mechanical properties of polypropylene polymer composite magnet are better than that using polyethylene (LDPE) binder. For polypropylene binder PP10 is better than PP2. Magnetic properties are not significantly affected by the change of polymer or binder types.Keywords: Composite magnet, Hexaferrite SrO.6Fe2O3, Polypropylene, Polyethylene, Epoxy, Polyester.
IMMOBILIZATION OF T.REESEI AND S.CELLULOPHYLUM CELLS ON IJUK COVERED WITH HYDROPHILIC AND HYDROPHOBIC POLYMERS BY IRRADIATION TECHNIQUE ., Erizal; R., Gatot T.; ., Sudirman
Jurnal Sains Materi Indonesia Vol 11, No 3 (2010): Juni 2010
Publisher : BATAN

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Abstract

This researchs were done to find out a system available for biomass conversion by immobilization of T.reesei and S.cellulophylum cells on ijuk covered with polymers. Dried ijuks were immersed in the 2-hydroxy ethyl methacrylate (HEMA) and trimethyl propane trimethacrylate (TMPT) solutions at weight ratio of 2/3 and 2/6, then irradiated by using electron beam at a dose of 30 kGy. The matrix covered with the polymers were then immersed in the media containing T.reesei and S.cellulophylum cells at temperature of 28 °C and 48 °C, and incubated at time ranged of 0-350 hours. The enzymes activity produced in the media were tested by reacting with filter paper. The results showed that the GPA (Glucose Paper Activity) values of T.reesei free cells was 2 times higher than immobilized cells on matrix covered with poly (HEMA) and 3 times higher than poly (TMPT). In contrast, the GPA values of immobilized S.cellulophylum cells on matrix covered with poly(HEMA) or poly(TMPT) were ± 2 times higher compared to the free cells.Keywords: Immobilization, Cells, T. Reesei, S. Cellulophylum, TMPT, HEMA.