Observation of a cubic phase in mesoporous silicate films grown at the air/water interface
chemical reaction
silicate
synthesis
Physics
water
Systems
article
diffraction
02 engineering and technology
film
Atomic
Molecular & Chemical
Dynamics
620
Scattering
reaction analysis
Chemistry
Surfactant
Physical
chemical structure
Keywords: macrogol
0210 nano-technology
Mcm-41
DOI:
10.1039/a807840h
Publication Date:
2002-07-26T09:11:48Z
AUTHORS (6)
ABSTRACT
X-Ray diffraction is reported from mesoporous silicate films grown at the air/water interface. The were studied both as powdered films, and oriented on silicon or mica sheets. At early stages of growth we observe Bragg a highly ordered cubic phase, with long short d-spacing peaks. We have assigned this discontinuous micellar Pm3n phase in which silica partly ordered. Later retain only known hexagonal p6m peaks lost any order d-spacings longer characteristic structure. framework considerably expanded that bulk amorphous silica, average Si···Si distances are some 30% greater. Incorporation glycerol polyethylene glycol preserves earlier To be consistent earlier, insitu, X-ray neutron reflectivity data infer structures produced after transition less-ordered film structure late induction phase. structural relations between phase(s) SBA-1 MCM-41 phases briefly discussed.
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