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Influence of TiO2 on the Pore Structure and Texture of SiO2-PDMS Hybrid Materials

Published online by Cambridge University Press:  01 February 2011

Lucía Téllez ,
Juan Rubio ,
Miguel A. Valenzuela ,
Fausto Rubio ,
Ernesto Morales  and
José L. Oteo
Lucía Téllez
Affiliation:
Dpt. Ingeniería Metalúrgica. ESIQIE-Instituto Politécnico Nacional. Zacatenco, 07738, México D.F., México.
Juan Rubio
Affiliation:
Instituto de Cerámica y Vidrio. C.S.I.C. Campus de Cantoblanco, 28049. Madrid. Spain.
Miguel A. Valenzuela
Affiliation:
Lab. Catálisis y Materiales. ESIQIE-Instituto Politécnico Nacional. Zacatenco, 07738, México D.F., México.
Fausto Rubio
Affiliation:
Instituto de Cerámica y Vidrio. C.S.I.C. Campus de Cantoblanco, 28049. Madrid. Spain.
Ernesto Morales
Affiliation:
Instituto de Cerámica y Vidrio. C.S.I.C. Campus de Cantoblanco, 28049. Madrid. Spain.
José L. Oteo
Affiliation:
Instituto de Cerámica y Vidrio. C.S.I.C. Campus de Cantoblanco, 28049. Madrid. Spain.
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Abstract

Porous SiO2-PDMS-TiO2 hybrid materials have been prepared by the Sol-Gel method using tetraethoxysilane (TEOS), silanol terminated-Polydimethylsiloxane (PDMS) and tetrabuthylortotitanate (TBT) as precursors. These materials were characterized by means of nitrogen adsorption, mercury porosimetry and helium picnometry. It was found that the meso and microporosity are predominant in all samples. The influence of the TBT concentration in the final pore structure and texture of SiO2-PDMS-TiO2 hybrid materials was studied. Results showed that increasing the TBT concentration decreases the pore volume of micropores, mesopores and macropores. On the other hand the specific surface areas of meso and macropores decreases with increasing TBT content, but micropore areas increase with TBT. These results are assigned to the formation of ultramicropores when TBT is added. In addition, surface roughness is found to increase with TBT concentration which is attributed to the formation of hydrous titanium oxide based nanoparticles.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 847: Symposium EE – Organic/Inorganic Hybrid Materials , 2004 , EE9.20
Copyright
Copyright © Materials Research Society 2005

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References

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