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

• DOI: 10.1039/a807840h
• Publication Date: 2002-07-26T09:11:48Z
• Authors: Jeremy L. Ruggles; Stephen A. Holt; Philip A. Reynolds; Anthony S. Brown; Dudley C. Creagh; John W. White
• Keywords: 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

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.