Browsing by Author "Sopyan, Iis"

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    Effect of Dispersant on Protein Foaming-consolidation Porous Alumina Containing Hydrothermal Derived Hydroxyapatite Nanopowder
    (2015-12-01) Sopyan, Iis; Fadli, Ahmad
    Present paper reports the effect of dispersant loading on physical properties of porous aluminahydroxyapatite (HA) composite bodies fabricated using protein foaming-consolidation method. Hydrothermal derived HA powder was used as bioactive ceramic. Alumina and HA powders were mixed with yolk, starch and darvan 821 A at an adjusted mass ratio to make slurry. The slurries were cast into cylindrical shaped molds and then dried for foaming and consolidation process. Subsequently, the dried bodies were burned at 600°C for 1 h, followed by sintering at temperatures of 1400°C for 2 h. The porous alumina-HA composites with pore size in the range of 50-500 μm and densities of 2.23 – 2.83 g cm-3 were obtained. Porosity of bodies decreased from 43.9 to 28.6% when dispersant amount increased from 0 to 7.0 g. The compressive strength of sintered bodies was found in the range of 20.3 to 104.8 MPa showing depends on porosity.
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    Effect Of Yolk Addition On Protein Foaming-Consolidation Porous Alumina-Calcium Phosphate Composites
    (2015-12-01) Sopyan, Iis; Fadli, Ahmad
    Porous alumina-calcium phosphate (CaP) composites have been prepared through protein foaming-consolidation method using egg yolk as the pore creating agent. The effect of yolk addition on physical and mechanical properties of porous bodies was investigated. The slurries were made by mixing alumina and CaP powders with yolk and starch. After drying, green bodies were burned at at 600°C for 1 h, followed by sintering at temperatures of 1400°C for 2 h. The porous alumina-CaP bodies with pore size in the range of 5o – 600 μm was obtained.The both density and shrinkage of sintered bodies increased from 2.23 to 2.78 g/cm3 and 78.8 to 95.6 vol.% respectively when yolk amount increased from 24 to 64 g. The compressive strength was found in the range of 20.3 – 68.5 MPa at 30 - 43.9% porosities
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    The Influence Of Hydroxyapatite Loading On Protein Foaming-Consolidation Porous Alumina Sintered At 1300°C
    (2015-12-01) Fadli, Ahmad; Sopyan, Iis
    Aim of this work is to investigate the effect of hydroxyapatite (HA) on physical properties of porous alumina bodies fabricated through protein foaming-consolidation method using egg yolk as a pore creating agent. Hydrothermal derived HA powder was used as bioactive ceramic. Alumina and HA powders were mixed with yolk, starch and darvan 821 A at an adjusted mass ratio to make slurry. HA-to-alumina mass ratio were in the range of 0.0 to 0.8 w/w. The slurries were cast into cylindrical shaped molds and then dried for foaming and consolidation process. Subsequently, the dried bodies were burned at 600°C for 1 h, followed by sintering at temperatures of 1,300°C for 2 h. The porous alumina-HA composites with pore size in the range of 50-500 μm and densities of 2.7 – 2.9 g cm-3 were obtained. Porosity of bodies decreased from 35.9 to 31.7% when HA-to-alumina mass ratio increased from 0.0 to 0.8 w/w. Compressive strength of sintered body was 0.8 MPa at 35.9% porosity and 2.9 MPa at 31.7% porosity. XRD pattern results show intensity of tricalcium phosphate (TCP) phase in bodies increased with HA loadings
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    Investigation of the Effect of Starch Addition on Protein Foaming- Consolidation Porous Alumina Containing Hydroxyapatite Nanopowder
    (2015-12-01) Fadli, Ahmad; Sopyan, Iis; Syahidah, Nur; Nadia, Nur
    The object of this study was to produce porous alumina-hydroxyapatite (HA) composite bodies via protein foaming-consolidation method. Egg yolk was used as a pore creating agent. Alumina and HA powders were mixed with yolk, starch and darvan 821 A at an adjusted mass ratio to make slurry. The slurries were cast into cylindrical shaped molds and then dried for foaming and consolidation process. Subsequently, the dried bodies were burned at 600°C for 1 h, followed by sintering at temperature of 1400°C for 2 h. The starch addition was selected as the variable factor. The density of porous bodies increased from 2.40 to 2.81 g cm-3 when starch amount increased from 1.0 to 3.0 g. The compressive strength was found 18.0 MPa at 38.3% porosity and it increased to 102.3 at 29.1% porosity. The pores of 50-600 μm size illustrating the rough enough internal surfaces, were obtained for potential use in hard tissue engineering.
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    Porous Alumina Via Protein Foaming-Consolidation Method
    (2015-12-01) Sopyan, Iis; Fadli, Ahmad
    We have succeeded in developing a novel method for preparation of porous alumina using egg yolk both as consolidator and foaming agents. Slurries of alumina powders and yolk were prepared by stirring the mixture with various alumina-to-yolk ratios (1.00, 0.83, 0.75, and 0.65) for 3 h and the resulting slips were poured into cylindrical shaped stainless steel molds and followed by foaming and consolidation through drying at 110, 150, 160, and 180 oC. The dried green bodies of the samples were then burned to remove the pore creating agent at 600 ºC for 1 h, followed by sintering at 1550 oC for 2 h. Alumina porous bodies with volume shrinkage of 29.3-39.9% were obtained. The compressive strength of the 1.00 alumina-to-yolk ratio’s sample was 4.57 MPa at 50.4 % porosity and it decreased significantly to 1.07 MPa at 71.7% porosity with alumina-to-yolk ratio of 0.65. Pore size distribution measurement showed that macropores of the sintered alumina porous bodies increased with the increased alumina-to-yolk ratio and temperature of drying process and were found in the range 50 – 900 μm. These results have opened a novel preparative way for porous ceramics especially alumina-based porous materials designed for biomedical applications.
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    Porous Alumina-Hydroxyapatite Composites Via Protein Foaming-Consolidation Method: Effect Of Ha Loading On Physical Properties
    (2015-12-01) Sopyan, Iis; Fadli, Ahmad; Zulkifli, Nur Izzati
    The porous alumina-hydroxyapatite (HA) composite bodies with good interconnectivity were successfully prepared via protein foaming-consolidation method. The egg yolk was used as a pore creating agent. Alumina and HA powders were mixed with yolk, starch and darvan 821 A at an adjusted mass ratio to make slurry. The slurries were cast into cylindrical shaped molds and then dried for foaming and consolidation process. Subsequently, the dried bodies were burned at 600°C for 1 h, followed by sintering at temperatures of 1,550°C for 2 h. The porous alumina-HA composites with pore size in the range of 50-500 μm with good interconnectivity were obtained. The densities and porosity were in the range of 2.15 – 2.48 g cm-3 and 36.7 – 45.8%, respectively. The increasing HA-to-alumina mass ratio in slurries from 0.4 to 0.6 w/w increased compressive strength of sintered bodies from 2.9 to 24.2 MPa. XRD pattern result shows presence of tricalcium phosphate (TCP) phase in the sintered bodies