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A Novel Route for Synthesizing Silica Nanotubes with Chiral Mesoporous Wall Structures
Stockholms universitet, Naturvetenskapliga fakulteten, Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi.
Vise andre og tillknytning
2007 (engelsk)Inngår i: Chemistry of Materials, ISSN 0897-4756, E-ISSN 1520-5002, Vol. 19, nr 7, s. 1577-1583Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2007. Vol. 19, nr 7, s. 1577-1583
Emneord [en]
SOL-GEL TRANSCRIPTION; HELICAL SILICA; INTERNAL STRUCTURE; ORGANOGEL FIBERS; TUBULES; SURFACTANT; CREATION; SYSTEM; ARCHITECTURE; FABRICATION
HSV kategori
Identifikatorer
URN: urn:nbn:se:su:diva-24772ISI: 000245208100010OAI: oai:DiVA.org:su-24772DiVA, id: diva2:198283
Tilgjengelig fra: 2008-04-03 Laget: 2008-03-28 Sist oppdatert: 2017-12-13bibliografisk kontrollert
Inngår i avhandling
1. Development of electron microscopy towards nano-structured porous materials: Focus on novel zeolites from layered silicates and chiral mesoporous nanotubes
Åpne denne publikasjonen i ny fane eller vindu >>Development of electron microscopy towards nano-structured porous materials: Focus on novel zeolites from layered silicates and chiral mesoporous nanotubes
2008 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Stockholm: Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi, 2008. s. 125
Emneord
Transmission electron microscopy, Layered silicates, Chiral mesoporous nanotubes
Forskningsprogram
strukturkemi
Identifikatorer
urn:nbn:se:su:diva-7439 (URN)978-91-7155-602-8 (ISBN)
Disputas
2008-04-25, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 12 A, Stockholm, 13:30 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2008-04-03 Laget: 2008-03-28 Sist oppdatert: 2010-04-14bibliografisk kontrollert

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