Co-Structure Directing Agent Induced Phase Transformation of Mesoporous Materials

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Atluri, Rambabu,1981-Uppsala universitet,Nanoteknologi och funktionella material,Nanotechnology and Functional Materials (author)

Co-Structure Directing Agent Induced Phase Transformation of Mesoporous Materials

Article/chapterEnglish2009

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2009-02-10
American Chemical Society (ACS),2009
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LIBRIS-ID:oai:DiVA.org:su-60374
https://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-60374URI
https://doi.org/10.1021/la803727uDOI
https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-99092URI

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Language:English
Summary in:English

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Subject category:ref swepub-contenttype
Subject category:art swepub-publicationtype

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authorCount :3
The synthesis of cubic Pm (3) over barn mesocaged solid templated by cetyltrimethyl ammonium bromide (C(16)TMABr) surfactant by direct cocondensation of (3-aminopropyl)triethoxysilanes (APES) under strong alkaline conditions is reported. The novel route gives direct incorporation of amino functional groups on the porous silica wall, and the structural formation has been followed by means of in situ SAXS studies performed at a synchrotron beam line. Data shows that a molar ratio of C(16)TMABr/APES = 0.6 favors the formation of 3D cubic mesocaged solid with Pm3n symmetry which transforms to a cylindrical mesoporous phase with p6mm symmetry at higher molar ratios. Further structural evaluation has been performed by means electron crystallography (EC). Reconstructed 3D models based on EC show the presence of spherical cages (A-cages, 45 angstrom) and ellipsoidal cages (B-cages, 48 x 43 angstrom) whereby every cage in the unit cell is connected to 14 nearest cages with a window size of 18 angstrom. Finally, a mechanism is proposed, denoted S+similar to N degrees I-, in which penetration of the neutral aminopropyl moiety within the micellar corona is responsible for the formation of the Pm (3) over barn phase, accounting for the formation of the hexagonal phase at higher molar ratios and higher temperatures. In comparison to other mesocaged materials with the same symmetry this structure possesses a more open porous network which will help assess its potential in a variety of applications discussed herein.

Subject headings and genre

NATURVETENSKAP Kemi hsv//swe
NATURAL SCIENCES Chemical Sciences hsv//eng
TEKNIK OCH TEKNOLOGIER Materialteknik Annan materialteknik hsv//swe
ENGINEERING AND TECHNOLOGY Materials Engineering Other Materials Engineering hsv//eng
amino-functionalized mcm-41
cubic sba-1 mesostructures
silica sba-1
pore-size
morphology control
surfactant
condensation
Chemistry
Kemi
Functional materials
Teknisk fysik med inriktning mot nanoteknologi och funktionella material

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Sakamoto, YasuhiroStockholms universitet (author)
Garcia-Bennett, Alfonso.EUppsala universitet,Nanoteknologi och funktionella material,Nanotechnology and Functional Materials(Swepub:uu)alfga768 (author)
Uppsala universitetNanoteknologi och funktionella material (creator_code:org_t)

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In:Langmuir: American Chemical Society (ACS)25:5, s. 3189-31950743-74631520-5827

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