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A Novel Route for Synthesizing Silica Nanotubes with Chiral Mesoporous Wall Structures
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
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2007 (English)In: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 19, no 7, 1577-1583 p.Article in journal (Refereed) Published
Abstract [en]

Right- and left-handed excess chiral mesoporous silica nanotubes with a helical channel in the wall have been formed by the self-assembly of an achiral surfactant sodium dodecyl sulfate (SDS) in the presence of (R)-(+)- and (S)-(-)- 2-amino-3-phenyl-1-propanol ((R)-(+)- and (S)-(-)-APP) chiral molecules. Transmission electron microscopy combined with computer simulations confirmed the presence of ordered chiral channels winding around the central axis of the tubes of similar to 100 nm inner diameter. Furthermore, it has been found that these have been produced through a specific crystallization route that hollows out the chiral mesoporous silica rod, which is different from the tube synthesis pathways reported previously. The enantiomeric excess ee of chiral mesoporous silica has been increased from 0 to a maximum value of 32% with increasing (R)-(+)-APP/SDS molar ratios from 0 to 0.8.

Place, publisher, year, edition, pages
2007. Vol. 19, no 7, 1577-1583 p.
Keyword [en]
SOL-GEL TRANSCRIPTION; HELICAL SILICA; INTERNAL STRUCTURE; ORGANOGEL FIBERS; TUBULES; SURFACTANT; CREATION; SYSTEM; ARCHITECTURE; FABRICATION
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:su:diva-24772ISI: 000245208100010OAI: oai:DiVA.org:su-24772DiVA: diva2:198283
Available from: 2008-04-03 Created: 2008-03-28 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Development of electron microscopy towards nano-structured porous materials: Focus on novel zeolites from layered silicates and chiral mesoporous nanotubes
Open this publication in new window or tab >>Development of electron microscopy towards nano-structured porous materials: Focus on novel zeolites from layered silicates and chiral mesoporous nanotubes
2008 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Three novel zeolites (M-IEZ-MWW, IEZ-FER and IEZ-CDO) have been successfully synthesised from the corresponding precursors. Structure characterisation of those materials was conducted by TEM. Our studies show that the structure of the new zeolites keeps identical layer to the corresponding known 3D zeolite, except for the distinct expansion of the layer spacing. Combining with results from XRD, N2 adsorption, IR and NMR, the expansion can be explained by the pillaring of T sites between the layers. Meanwhile, the intergrowth of 3D MWW and IEZ-MWW was observed in the Al-IEZ-MWW and Si-IEZ-MWW crystals, IEZ-CDO structure was found in the IEZ-FER crystals, and the intergrowth of CDO and new polymorph was observed in the CDS-1 crystal. Moreover, two new zeolites IM-5 and SSZ-57 were also studied by TEM. We found that the space group of IM-5 is non-centrosymmetrical, and in SSZ-57 the new structure with slightly larger c parameter was observed compared to MEL.

Chiral mesoporous silica nanotube and chiral mesoporous carbon nanotube were aslo investigated by TEM. We found that the former was synthesised by hollowing out process and it possesses chiral mesopores in the wall, the latter was synthesised by templating and seeding method. Electron tomography was first applied to study the handedness of the chiral mesoporous nanotube. Furthermore, TEM studies verified that bifunctional mesoporous silica has a Fm-3m structure, and mesoporous carbon FDU-16 has a Im-3m structure.

Place, publisher, year, edition, pages
Stockholm: Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi, 2008. 125 p.
Keyword
Transmission electron microscopy, Layered silicates, Chiral mesoporous nanotubes
Research subject
Structural Chemistry
Identifiers
urn:nbn:se:su:diva-7439 (URN)978-91-7155-602-8 (ISBN)
Public defence
2008-04-25, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 12 A, Stockholm, 13:30 (English)
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Available from: 2008-04-03 Created: 2008-03-28 Last updated: 2010-04-14Bibliographically approved

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