Hydration pressure in nonionic block copolymer systems
Mesoporous materials have attracted a lot of attention over the past decade due to the high potential applications such as heterogeneous catalysis, separation processes and novel applications in optics and electronics. The pore diameter (typically from 2 to 30 nm) and the wall thickness are the major parameters which influence possible utilization of mesoporous materials. The pore size is directly linked to the diameter of the templating micelles. The wall thickness – from which depends the solidity of the material – is more difficult to control. A recent paper proposes a new approach, based on the molecular force balance, to explain qualitatively and in some simple cases quantitatively the wall thickness of mesoporous materials obtained by a sol-gel route. The model represents correctly the data for charged surfactants, but failed to explain the results for nonionic Pluronic templates. One reason could be the hydration pressure that is not known for pluronic. Consequently, we propose to measure the hydration pressure as a function of the relative humidity for two Pluronic molecules using the humidity chamber available on D16.
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GRILLO Isabelle; CRISTIGLIO Viviana; IMPEROR CLERC Marianne and Julien Schmitt. (2012). Hydration pressure in nonionic block copolymer systems. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.9-11-1621
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