Hydroxyapatite Powders Via Sol-Gel Technique For Medical Applications and Their Conversion to Porous Dense Bodies  

Oleh:

Sopyan, Iis

Jenis: Article from Journal - ilmiah nasional - terakreditasi DIKTI
Dalam koleksi: IPTEK: The Journal for Technology and Science vol. 14 no. 2 (Apr. 2003), page 56-64.
Topik: hydroxtapatite powders; porous bodies; dense bodies; sol-gel; medical application; Preparation; characterization

Ketersediaan

Perpustakaan Pusat (Semanggi) Nomor Panggil: MM48.3 Non-tandon: 1 (dapat dipinjam: 0) Tandon: tidak ada

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Isi artikel

Hydroxyapatite powders were prepared via sol-gel procedure using calcium nitrate tetrahydrate and diammonium hydrogen phosphate as the percusors for calcium and phosphorus, respectively. The yield of the powder hydroxyapatite achieved almost 100%. Good purity (98-100%) of the obtained hydroxyapatite powder was confirmed by XRD analysis. Morphological evaluation by SEM measurements shows that the particles of the HA agglomerate are globular in shape with an average size of 1-2 µm in diameter. Meanwhile, the primary particles have a diameter of 70-150 nm in average. Surface area of the powder is 7 m²/g and the mean particle size as measured using X ray sedimentation method is ca. 1 µm. By using the HA powder, porous bodies of HA were prepared; in this case firstly suspensions of the powder were prepared with an adjusted loading of HA, using a dispersant. After soaking cellulosic sponges into the suspension, the sponges were dried and then subjected to heat-treatment at 600°C, followed by sintering at 1250°C for 1h. The apparent density of the porous bodies is 1.290 g/cm3, with a porosity of 59%. The sintering shrinkage is about 20% (in respect of dimension) and 44% (in respect of volume). Morphological evaluation of the porous bodies shown that the sample contained macropores of 1-2 mm diameter and micropres of 1-2 µm diameter. The measurement of compressive strength provided 1.31 ± 0.30 MPa. Subsequently, dense samples were prepared from the as-prepared powder. After a physico-chemical treatment, the powders were compressed uniaxially using cold pressing technique at 800 kg/cm² and the pellets obtained were sintered in air at 1250°C for 1h. The sintered dense bodies have apparent density of 20855 g/cm³, with a 10% porosity. The flexural strength of the dense bodies measured was 57.7 MPa.

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