Innocenzi P.,State Power Dadu Hydropower Development Co. |
Figus C.,State Power Dadu Hydropower Development Co. |
Takahashi M.,Osaka Prefecture University |
Piccinini M.,Imaging Laboratory |
Malfatti L.,State Power Dadu Hydropower Development Co.
Journal of Physical Chemistry A | Year: 2011
Time resolved infrared spectroscopy has been applied to study in situ the evaporation process of a 3-glycidoxypropyltrimethoxysilane hybrid sol by casting a droplet on a ZnSe substrate; the analysis has been performed in the middle-infrared range and in the near-infrared range. The experiment has allowed following the structural changes induced by water evaporation and the formation of ordered structures within the cast film; the CH 2 scissoring bands have been used as a fingerprint for the disorder to order transition of the hybrid. The experiment has been done using both a fresh sol and an aged sol which produce respectively an amorphous material and a crystalline hybrid material. The analysis has shown that the epoxy groups do not react during the evaporation while the silica structure shows only a slight condensation and an increase in open cage-like species. At the end of evaporation the hybrid has a "soft-like" state which allows structural rearrangements to self-order. © 2011 American Chemical Society.
Carboni D.,State Power Dadu Hydropower Development Co. |
Pinna A.,State Power Dadu Hydropower Development Co. |
Malfatti L.,State Power Dadu Hydropower Development Co. |
Innocenzi P.,State Power Dadu Hydropower Development Co.
New Journal of Chemistry | Year: 2014
Hybrid films prepared from 3-glycidoxypropyltrimethoxysilane have been widely used as organic-inorganic materials for several applications. Tailoring the coating surface should disclose new possibilities of applications in biomaterials as functional interfaces for cells and enzymes. In this work we have designed the synthesis of 3-glycidoxypropyltrimethoxysilane hybrid films to modify the surface properties without additional surface functionalization steps. The pH of the precursor sols has been changed from highly basic to acidic and neutral pH and then the sols have been used to deposit highly transparent films. The analysis by infrared spectroscopy has shown that the synthetic conditions allow tuning the degree of condensation of the silica network and the percentage of epoxide ring opening. A precise control of these two parameters enables the formation of a smart surface library where hydroxyl or epoxide groups or the mixed presence of both change the hydrophobicity of the surface and thus its capability of binding molecules and nano-objects. © 2014 The Royal Society of Chemistry and the Centre National de la Recherche Scientifique.