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

Ruggles, Jeremy; Holt, Stephen; Reynolds, Philip; Brown, A S; Creagh, Dudley C; White, John

Description

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...[Show more]

dc.contributor.authorRuggles, Jeremy
dc.contributor.authorHolt, Stephen
dc.contributor.authorReynolds, Philip
dc.contributor.authorBrown, A S
dc.contributor.authorCreagh, Dudley C
dc.contributor.authorWhite, John
dc.date.accessioned2015-12-13T23:35:14Z
dc.date.available2015-12-13T23:35:14Z
dc.identifier.issn1463-9076
dc.identifier.urihttp://hdl.handle.net/1885/93825
dc.description.abstractX-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 film 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.
dc.publisherRoyal Society of Chemistry
dc.sourcePhysical Chemistry Chemical Physics
dc.subjectKeywords: macrogol; silicate; water; article; chemical reaction; chemical structure; diffraction; film; reaction analysis; synthesis
dc.titleObservation of a cubic phase in mesoporous silicate films grown at the air/water interface
dc.typeJournal article
local.description.notesImported from ARIES
local.description.refereedYes
local.identifier.citationvolume1
dc.date.issued1999
local.identifier.absfor030603 - Colloid and Surface Chemistry
local.identifier.ariespublicationMigratedxPub25242
local.type.statusPublished Version
local.contributor.affiliationRuggles, Jeremy, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationHolt, Stephen, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationReynolds, Philip, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationBrown, A S, College of Physical and Mathematical Sciences, ANU
local.contributor.affiliationCreagh, Dudley C, University of Canberra
local.contributor.affiliationWhite, John, College of Physical and Mathematical Sciences, ANU
local.bibliographicCitation.startpage323
local.bibliographicCitation.lastpage328
local.identifier.doi10.1039/a807840h
dc.date.updated2015-12-12T09:39:11Z
local.identifier.scopusID2-s2.0-0033556564
CollectionsANU Research Publications

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