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Titolo:
Synthesis and in vitro behavior of organically modified silicate containing Ca ions
Autore:
Tsuru, K; Aburatani, Y; Yabuta, T; Hayakawa, S; Ohtsuki, C; Osaka, A;
Indirizzi:
Okayama Univ, Fac Engn, Biomat Lab, Okayama 7008530, Japan Okayama Univ Okayama Japan 7008530 n, Biomat Lab, Okayama 7008530, Japan
Titolo Testata:
JOURNAL OF SOL-GEL SCIENCE AND TECHNOLOGY
fascicolo: 1-2, volume: 21, anno: 2001,
pagine: 89 - 96
SICI:
0928-0707(2001)21:1-2<89:SAIVBO>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
GEL; ORMOSILS; NMR;
Keywords:
sol-gel method; organically modified silicates; bioactivity; Si-29 MAS NMR;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
14
Recensione:
Indirizzi per estratti:
Indirizzo: Tsuru, K Okayama Univ, Fac Engn, Biomat Lab, 2-5-1 Shikata Cho, Okayama 7008530, Japan Okayama Univ 2-5-1 Shikata Cho Okayama Japan 7008530 8530, Japan
Citazione:
K. Tsuru et al., "Synthesis and in vitro behavior of organically modified silicate containing Ca ions", J SOL-GEL S, 21(1-2), 2001, pp. 89-96

Abstract

Organically modified silicates containing calcium ion have a potential to bond to bone via an apatite layer deposited on their surfaces in the body environment. In this study, we examined the relationship between apatite deposition and the microstructure of the organically modified silicates synthesized from tetraethoxysilane (TEOS) and poly (dimethylsiloxane) (PDMS) witha different amount of calcium nitrate tetrahydrate (Ca(NO3)(2). 4H(2)O) and hydrochloric acid (HCl). Apatite deposition was evaluated in vitro using a simulated body fluid (Kokubo solution). Copolymerization was confirmed between TEOS and PDMS even if PDMS free from -SiOH termination are used as one of the starting materials. The porosity and Ca content incorporated in the structure depended on the amount of HCl, whereas analysis of Si-29 MAS NMR spectra indicates that it caused few effects on the local structure around Si atoms. Apatite-forming ability is enhanced by optimal amounts of HCl and Ca (NO3)(2). 4H(2)O. The difference in apatite-forming ability among thehybrid gels was attributed to both Ca(II) contents in the structure and aggregation states of the Si-OH groups. Better bioactivity of the hybrid gelsis achieved by the release of Ca(II) ions trapped in structure at gelationand the formation of hydrated silica rich in Si-OH.

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Documento generato il 26/09/17 alle ore 09:11:48