title: Intrusion/Extrusion of water into organic grafted SBA-15 silica materials for energy storage.
abstract: Mesoporous SBA-15 silica materials were grafted with trialkylsilyl compounds having short (C1) and long (C8) carbon chain and characterized by XRD, N2 physisorption analysis, 29Si MAS-NMR and contact angle (CA) measurements. A drastic enhancement of the hydrophobic property after grafting was observed by forced intrusion water; it occurred in two steps and with quite high intrusion pressures (mean values - 10 and - 15 MPa). The hydrophobic nature of both internal and external surface area was confirmed by 29Si MAS-NMR and CA measurements, respectively. After contact with water, materials displayed a partial hydrophobic behaviour with uncompleted spontaneous extrusion. The energies absorbed during water intrusion correspond to 4.3 and 6.1 J x g(-1) for C1 and C8 grafted species, respectively.
authors.affiliation: Institut de Science des Matériaux de Mulhouse-IS2M-LRC CNRS 7228, Université de Haute Alsace, 3 rue Alfred Werner, 68093 Mulhouse Cedex, France.
authors.forename: Narasimhan
authors.initials: N
authors.lastname: Gokulakrishnan
authors.forename: Julien
authors.initials: J
authors.lastname: Parmentier
authors.forename: Mickaël
authors.initials: M
authors.lastname: Trzpit
authors.forename: Laurent
authors.initials: L
authors.lastname: Vonna
authors.forename: Jean Louis
authors.initials: JL
authors.lastname: Paillaud
authors.forename: Michel
authors.initials: M
authors.lastname: Soulard