Highly ordered self-assembled mesostructured membranes: Porous structure and pore surface coverage

Malfatti, L., Kidchob, T., Falcaro, P., Costacurta, S., Piccinini, M., Guidi, M.C., Marcelli, A., Corrias, A., Casula, M.F., Amenitsch, H., and others. (2007) Highly ordered self-assembled mesostructured membranes: Porous structure and pore surface coverage. Microporous and Mesoporous Materials, 103 (1-3). pp. 113-122. ISSN 1387-1811. (doi:10.1016/j.micromeso.2007.01.033) (The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided)

The full text of this publication is not currently available from this repository. You may be able to access a copy if URLs are provided. (Contact us about this Publication)
Official URL
http://dx.doi.org/10.1016/j.micromeso.2007.01.033

Abstract

Highly ordered silica and hybrid organic-inorganic membranes have been obtained through a slow and controlled solvent evaporation in the presence of a triblock copolymer as the structure-directing agent. Crack-free mesostructured membranes of large dimensions have been prepared. The mesophase is self-organized into a periodic cubic structure, Im over(3, Ì?) m, and consists of macroscopic mesostructured domains that maintain the out-of-plane order throughout the material. After calcination at 350 °C the membranes remain transparent even though they break in fragments of some centimeters. Different techniques have been employed to characterize the mesoporous materials: small angle X-ray scattering (SAXS) using synchrotron radiation and transmission electron microscopy to study the porous structure, Fourier transform infrared spectroscopy (FTIR) in vacuum at different partial pressures to investigate the nature of the pore surface. SAXS analysis has been used to map the whole membrane, revealing some differences in the pore organization that can be attributed to a gradient in the evaporation rate. The infrared measurements at different partial pressures have elucidated the mechanism of water adsorption-desorption on the pore surface. The changes of the FTIR spectra with different partial pressure have demonstrated that the pore surface is covered by a layer of molecular water that is hydrogen bonded to silanol species.

Item Type: Article
DOI/Identification number: 10.1016/j.micromeso.2007.01.033
Uncontrolled keywords: FTIR, Membrane, Mesoporous silica, SAXS, Self-assembly, Block copolymers, Evaporation, Fourier transform infrared spectroscopy, Self assembly, Silica, Solvents, Mesoporous silica, Mesostructured domains, Small angle X-ray scattering (SAXS), Mesoporous materials, Block copolymers, Evaporation, Fourier transform infrared spectroscopy, Mesoporous materials, Self assembly, Silica, Solvents
Subjects: Q Science > QC Physics > QC176.8.N35 Nanoscience, nanotechnology
Divisions: Faculties > Sciences > School of Physical Sciences > Functional Materials Group
Depositing User: Anna Corrias
Date Deposited: 16 Dec 2014 14:50 UTC
Last Modified: 29 May 2019 13:56 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/46173 (The current URI for this page, for reference purposes)
  • Depositors only (login required):