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
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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