Dynamics of water confined in strongly hydrophobic Fluorinated mesopores
Mesostructured porous hydrophilic hosts have been widely used in QENS studies of nanoconfined water dynamics. This resulted in a good general understanding of the effects of pore size and surface interactions on the molecular mobility. On the contrary in strongly hydrophobic environments, despite numerous simulation studies, the situation is far from being as clear experimentally. A key problem is that the pore geometry and the surface hydrophobic interaction should ideally be controlled, which is much harder experimentally than in simulation. For this purpose, we have designed fluorinated periodic mesoporous organosilicas (i.e. paradigms of hydrophobic materials), with a unique control of pore geometry (D = 4.5 nm) and surface chemistry. Based on a recent QENS study of water in hydrophilic / weakly hydrophobic pores, we recognize that IN5B is ideally suited to answer questions about the mobility of water near hydrophobic surfaces, in terms of non-mobile / mobile fraction, self-diffusion coefficient, residence time, confining radius, local relaxation time, and their temperature dependence.
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MORINEAU Denis; BUSCH Mark; FROEBA Michael; GRIES Stella; HUBER Patrick; JANI; MALFAIT Benjamin; OLLIVIER Jacques and SCHWAKE Sophia. (2021). Dynamics of water confined in strongly hydrophobic Fluorinated mesopores. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.6-07-91
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