Bioactivity of wollastonite/aerogels composites obtained from a TEOS-MTES matrix.
Organic-inorganic hybrid materials were synthesized by controlled hydrolysis of tetraethoxysilane (TEOS), methyltrimethoxysilane (MTES), synthetic wollastonite powders and polydimethylsiloxane (PDMS) in an ethanol solution. Aerogels were prepared from acid hydrolysis of TEOS and MTES with different volume ratio in ethanol, followed by addition of wollastonite powder and PDMS in order to obtain aerogels with 20 wt% of PDMS and 5 wt% of CaO of the total silica. Finally, when the wet gels were obtained, they were supercritically dried at 260 degrees C and 90 bar, in ethanol. In order to obtain its bioactivity, one method for surface activation is based on a wet chemical alkaline treatment. The particular interest of this study is that we introduce hybrid aerogels, in a 1 M solution of NaOH, for 30 s at room temperature. We evaluate the bioactivity of TEOS-MTES aerogel when immersed in a static volume of simulated body fluid (SBF). An apatite layer of spherical-shaped particles of uniform size smaller than 5 microns is observed to form on the surface of the aerogels after 25 days soaking in SBF.
Departamento Física de la Materia Condensada, Facultad de Ciencias, Universidad de Cádiz, Avenida República Saharaui, s/n, 11510 Puerto Real, Cadiz, Spain.
Jose Antonio
JA
Toledo-Fernández
Roberto
R
Mendoza-Serna
Victor
V
Morales
Nicolás
N
de la Rosa-Fox
Manuel
M
Piñero
Alberto
A
Santos
Luis
L
Esquivias
D001672:Biocompatible Materials; D001826:Body Fluids / Q000737:chemistry; D017610:Calcium Compounds / Q000737:chemistry*; D004129:Dimethylpolysiloxanes / Q000737:chemistry*; D006801:Humans; D008422:Materials Testing; D008855:Microscopy, Electron, Scanning; D011108:Polymers / Q000737:chemistry; D011312:Pressure; D012821:Silanes / Q000737:chemistry*; D017640:Silicates / Q000737:chemistry*; D012828:Silicones / Q000737:chemistry*; D017550:Spectroscopy, Fourier Transform Infrared; D013499:Surface Properties; D013696:Temperature; D013997:Time Factors
D001672:Biocompatible Materials; D017610:Calcium Compounds; D004129:Dimethylpolysiloxanes; D011108:Polymers; D012821:Silanes; D017640:Silicates; D012828:Silicones; C071718:methyltrimethoxysilane; C040733:tetraethoxysilane; C013830:baysilon; C031293:calcium silicate