Paper Title:
Molecular Dynamics Modelling of the Structure of Bioactive (CaO)0.3 (SiO2)0.7 Sol-Gel
  Abstract

Enhanced bioactivity has been observed for amorphous CaO-SiO2 sol-gels with 30mol% CaO, and several structural techniques have recently been used to investigate the structural basis for this bioactivity. The current work presents the first detailed atomic model of (CaO)0.3(SiO2)0.7 solgel after heat treatment at 600°C, produced using molecular dynamics. The model contains 1056 atoms in cubic box with length 24.1Å, and specifically incorporates hydroxyl groups which are characteristic of the sol-gel. The model is in good agreement with experimental X-ray and neutron diffraction results. Inspection of the model shows a network of SiO4 tetrahedra with an average connectivity of approximately 3. Ca have coordination of NCaO=5.3, in agreement with experimental results. On average, each Ca is surrounded by 4 other Ca, and visual inspection shows several large clusters of Ca. These clusters should influence the dissolution of Ca, and hence the bioactivity of (CaO)0.3(SiO2)0.7 sol-gel.

  Info
Periodical
Materials Science Forum (Volumes 514-516)
Edited by
Paula Maria Vilarinho
Pages
1059-1063
DOI
10.4028/www.scientific.net/MSF.514-516.1059
Citation
R. N. Mead, G. Mountjoy, "Molecular Dynamics Modelling of the Structure of Bioactive (CaO)0.3 (SiO2)0.7 Sol-Gel", Materials Science Forum, Vols. 514-516, pp. 1059-1063, 2006
Online since
May 2006
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Price
$32.00
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