Observation of a cubic phase in mesoporous silicate films grown at the air/water interface

被引:36
作者
Ruggles, JL
Holt, SA
Reynolds, PA
Brown, AS
Creagh, DC
White, JW [1 ]
机构
[1] Australian Natl Univ, Res Sch Chem, Canberra, ACT 0200, Australia
[2] Univ Canberra, Belconnen, ACT 2616, Australia
关键词
D O I
10.1039/a807840h
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
X-Ray diffraction is reported from mesoporous silicate films grown at the air/water interface. The films were studied both as powdered films, and oriented on silicon or mica sheets. At early stages of growth we observe Bragg diffraction from a highly ordered cubic phase, with both long and short d-spacing peaks. We have assigned this as a discontinuous micellar Pm3n phase in which the silica is partly ordered. Later films retain only the known hexagonal p6m peaks and have lost any order both at short d-spacings and the longer d-spacing Bragg peaks characteristic of the cubic structure. The silica framework is considerably expanded from that in bulk amorphous silica, average Si Si distances are some 30% greater. Incorporation of glycerol or polyethylene glycol preserves the earlier cubic structure. To be consistent with earlier, in situ, X-ray and neutron reflectivity data we infer that both structures are produced after a phase transition from a less-ordered him structure late in the induction phase. The structural relations between the film Pm3n and p6m phase(s) and the known bulk SBA-1 and MCM-41 phases are briefly discussed.
引用
收藏
页码:323 / 328
页数:6
相关论文
共 23 条
[1]   Biomimetic pathways for assembling inorganic thin films [J].
Aksay, IA ;
Trau, M ;
Manne, S ;
Honma, I ;
Yao, N ;
Zhou, L ;
Fenter, P ;
Eisenberger, PM ;
Gruner, SM .
SCIENCE, 1996, 273 (5277) :892-898
[2]   CUBIC MESOMORPHIC PHASES [J].
BALMBRA, RR ;
CLUNIE, JS ;
GOODMAN, JF .
NATURE, 1969, 222 (5199) :1159-&
[3]   CRYSTAL AND MOLECULAR-STRUCTURE OF HEXADECYLTRIMETHYLAMMONIUM DICHLOROIODIDE, AN ANTISEPTIC AGENT [J].
BANDOLI, G ;
CLEMENTE, DA ;
NICOLINI, M .
JOURNAL OF CRYSTAL AND MOLECULAR STRUCTURE, 1978, 8 (06) :279-293
[4]   THE AUSTRALIAN DIFFRACTOMETER AT THE PHOTON FACTORY [J].
BARNEA, Z ;
CREAGH, DC ;
DAVIS, TJ ;
GARRETT, RF ;
JANKY, S ;
STEVENSON, AW ;
WILKINS, SW .
REVIEW OF SCIENTIFIC INSTRUMENTS, 1992, 63 (01) :1069-1072
[5]   A NEW FAMILY OF MESOPOROUS MOLECULAR-SIEVES PREPARED WITH LIQUID-CRYSTAL TEMPLATES [J].
BECK, JS ;
VARTULI, JC ;
ROTH, WJ ;
LEONOWICZ, ME ;
KRESGE, CT ;
SCHMITT, KD ;
CHU, CTW ;
OLSON, DH ;
SHEPPARD, EW ;
MCCULLEN, SB ;
HIGGINS, JB ;
SCHLENKER, JL .
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 1992, 114 (27) :10834-10843
[6]   Mesoporous silicate film growth at the air-water interface - Direct observation by x-ray reflectivity [J].
Brown, AS ;
Holt, SA ;
Dam, T ;
Trau, M ;
White, JW .
LANGMUIR, 1997, 13 (24) :6363-6365
[7]   Growth of highly ordered thin silicate films at the air-water interface [J].
Brown, AS ;
Holt, SA ;
Reynolds, PA ;
Penfold, J ;
White, JW .
LANGMUIR, 1998, 14 (19) :5532-5538
[8]   PERIODIC-SYSTEMS OF FRUSTRATED FLUID FILMS AND MICELLAR CUBIC STRUCTURES IN LIQUID-CRYSTALS [J].
CHARVOLIN, J ;
SADOC, JF .
JOURNAL DE PHYSIQUE, 1988, 49 (03) :521-526
[9]   Small-angle neutron scattering studies on the mesoporous molecular sieve MCM-41 [J].
Edler, KJ ;
Reynolds, PA ;
White, JW .
JOURNAL OF PHYSICAL CHEMISTRY B, 1998, 102 (19) :3676-3683
[10]   Methane dynamics in the 36 angstrom mesopores of MCM-41 studied by neutron scattering [J].
Edler, KJ ;
Reynolds, PA ;
Trouw, F ;
White, JW .
CHEMICAL PHYSICS LETTERS, 1996, 249 (5-6) :438-443