TPD, FTIR, and Molecular Adsorption Studies of Calcium Hydroxyapatite Surface Modified with Hexanoic and Decanoic Acids
✍ Scribed by Hidekazu Tanaka; Tohru Watanabe; Masatoshi Chikazawa; Kazuhiko Kandori; Tatsuo Ishikawa
- Publisher
- Elsevier Science
- Year
- 1999
- Tongue
- English
- Weight
- 121 KB
- Volume
- 214
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
The surface of synthetic calcium hydroxyapatite Ca 10 (PO 4 ) 6 (OH) 2 (CaHAP) particles was modified with hexanoic CH 3 (CH 2 ) 4 COOH (HA) and decanoic CH 3 (CH 2 ) 8 COOH (DA) acids in hexane and the resulting materials were characterized by various means. XRD pattern, specific surface area, and morphology of the CaHAP particles were essentially not altered by the modification. FTIR and TPD results indicated that HA and DA molecules are hydrogen-bonded to the surface P-OH groups of CaHAP in three adsorption types. The surface of modified particles became hydrophobic. When the modified samples were outgassed at 500°C, HA and DA were removed and the surface P-OH groups were revived. The modified material adsorbed much less H 2 O and CO 2 than the unmodified one.