Intrusion/Extrusion of water into organic grafted SBA-15 silica materials for energy storage.
J Nanosci Nanotechnol
; 13(4): 2847-52, 2013 Apr.
Article
en En
| MEDLINE
| ID: mdl-23763170
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.
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Base de datos:
MEDLINE
Idioma:
En
Revista:
J Nanosci Nanotechnol
Año:
2013
Tipo del documento:
Article
País de afiliación:
Francia