TY - JOUR
T1 - Enlargement of mesopores of 2-D orthorhombic KSW-2 type silica by the addition of poly(oxyethylene) alkyl ether during the mesostructural formation
AU - Takahashi, Nobuyuki
AU - Kimura, Tatsuo
AU - Kuroda, Kazuyuki
PY - 2011/4/1
Y1 - 2011/4/1
N2 - The size of mesopores in 2-D orthorhombic KSW-2 type silica, derived from a layered silicate kanemite, can be enlarged by the addition of poly(oxyethylene) alkyl ether (C16EO10) during the mesostructural transformation from a lamellar phase to a 2-D orthorhombic one. Precursors for pore-expanded KSW-2 type silica were prepared by an acid treatment of lamellar hexadecyltrimethylammonium-intercalated kanemite (C16TMA-kanemite) in the presence of C16EO10. The acid treatment induces simultaneous reactions of (1) intercalation of C16EO10, (2) deintercalation of C16TMA cations, and (3) mesostructural transformation into a 2-D orthorhombic phase. Depending on the concentration of C16EO10, the d11 spacing of the products after the acid treatment but before calcination varied from 4.0 to 5.4 nm and that of the calcined products varied from 3.5 nm to 4.8 nm. The method provides a precise control in a certain range of the pore size of KSW-2 type mesoporous silica.
AB - The size of mesopores in 2-D orthorhombic KSW-2 type silica, derived from a layered silicate kanemite, can be enlarged by the addition of poly(oxyethylene) alkyl ether (C16EO10) during the mesostructural transformation from a lamellar phase to a 2-D orthorhombic one. Precursors for pore-expanded KSW-2 type silica were prepared by an acid treatment of lamellar hexadecyltrimethylammonium-intercalated kanemite (C16TMA-kanemite) in the presence of C16EO10. The acid treatment induces simultaneous reactions of (1) intercalation of C16EO10, (2) deintercalation of C16TMA cations, and (3) mesostructural transformation into a 2-D orthorhombic phase. Depending on the concentration of C16EO10, the d11 spacing of the products after the acid treatment but before calcination varied from 4.0 to 5.4 nm and that of the calcined products varied from 3.5 nm to 4.8 nm. The method provides a precise control in a certain range of the pore size of KSW-2 type mesoporous silica.
KW - Brij56
KW - Hexadecyltrimethylammonium
KW - KSW-2
KW - Kanemite
KW - Mesoporous silica
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U2 - 10.1016/j.solidstatesciences.2010.06.023
DO - 10.1016/j.solidstatesciences.2010.06.023
M3 - Article
AN - SCOPUS:79953042836
VL - 13
SP - 714
EP - 720
JO - Solid State Sciences
JF - Solid State Sciences
SN - 1293-2558
IS - 4
ER -