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Titolo:
Nucleation and growth of hydroxyapatite on an amino organosilane overlayer
Autore:
Zhu, PX; Ishikawa, M; Seo, WS; Hozumi, A; Yokogawa, Y; Koumoto, K;
Indirizzi:
Nagoya Univ, Grad Sch Engn, Dept Appl Chem, Nagoya, Aichi, Japan Nagoya Univ Nagoya Aichi Japan ngn, Dept Appl Chem, Nagoya, Aichi, Japan Natl Ind Res Inst Nagoya, Nagoya, Aichi 462, Japan Natl Ind Res Inst Nagoya Nagoya Aichi Japan 462 Nagoya, Aichi 462, Japan
Titolo Testata:
JOURNAL OF BIOMEDICAL MATERIALS RESEARCH
fascicolo: 2, volume: 59, anno: 2002,
pagine: 294 - 304
SICI:
0021-9304(200202)59:2<294:NAGOHO>2.0.ZU;2-J
Fonte:
ISI
Lingua:
ENG
Soggetto:
SELF-ASSEMBLED MONOLAYERS; SIMULATED BODY-FLUID; APATITE FORMATION; ELECTROPHORETIC DEPOSITION; MECHANISM; COATINGS;
Keywords:
amino organosilane overlayer; hydroxyapatite; homogeneous and heterogeneous nucleation; growth; electrostatic interaction;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
36
Recensione:
Indirizzi per estratti:
Indirizzo: Koumoto, K Nagoya Univ, Grad Sch Engn, Dept Appl Chem, Nagoya, Aichi, Japan Nagoya Univ Nagoya Aichi Japan ppl Chem, Nagoya, Aichi, Japan
Citazione:
P.X. Zhu et al., "Nucleation and growth of hydroxyapatite on an amino organosilane overlayer", J BIOMED MR, 59(2), 2002, pp. 294-304

Abstract

An amino organosilane overlayer (NH2-overlayer) was successfully processedon Si/SiO2 substrates. Remarkable nucleation and growth of hydroxyapatite were found to take place on an NH2-overlayer after Si/SiO2 substrates covered with the NH2-overlayer were soaked in supersaturated solutions with respect to Ca2+ and PO43- ions [1.0SBF (simulated body fluid), which contains similar compositions to that in a living body and 1.5SBF in which only Ca2+ and PO43- concentrations are 1.5 times than that in 1.0SBF]. The experimental results demonstrated that HAp nucleation on an NH2-overlayer is related to the electrostatic attractive force between positive NH2-overlayer surface and negative incipient HAp microparticles homogeneously nucleated in 1.5SBF solution at 50 degreesC. On the contrary, fewer HAp particles were observed on negatively charged "OH" terminated self-assembled monolayer (SAM) because of the repulsive interaction. The Ca/P molar ratios of HAp particles increased from 0.92 at the beginning of nucleation in 1.5SBF to 1.63 in 14 days after growth in 1.0SBF at 37 degreesC. After 14 days of soaking in 1.0SBF, a dense HAp film with the thickness up to 8.6 mum was formed on the NH2-overlayer. (C) 2001 John Wiley & Sons, Inc.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 19:39:33