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Synthesis and Characterization of the Amphoteric Amino Acid Bifunctional Mesoporous Silica
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
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 11, 2860-2867 p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2007. Vol. 19, no 11, 2860-2867 p.
Identifiers
URN: urn:nbn:se:su:diva-19813DOI: 10.1021/cm0705845ISI: 000246645100025OAI: oai:DiVA.org:su-19813DiVA: diva2:186337
Available from: 2007-11-28 Created: 2007-11-28 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)
Opponent
Supervisors
Available from: 2008-04-03 Created: 2008-03-28 Last updated: 2010-04-14Bibliographically approved
2. Synthesis and Characterization of Functionalized Silica Mesoporous Crystals: Cationic Surfactant and Co-structure Directing Agent System
Open this publication in new window or tab >>Synthesis and Characterization of Functionalized Silica Mesoporous Crystals: Cationic Surfactant and Co-structure Directing Agent System
2010 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

This dissertation has been focused on the synthesis and characterization of novel functionalized silica mesoporous crystals by using cationic surfactant and co–structure directing agents (CSDA), the central concept of the synthesis method is to build proper organic/inorganic interactions by introducing CSDA into the synthesis system.

By using cationic surfactant as template and anionic CSDA, carboxylic group functionalized mesoporous silicas were successfully synthesized. Well ordered 2D p6mm, cubic Fm-3m, mixture of CCP (Fm-3m) and HCP (P63/mmc), and cubic Fd-3m with uniform carboxylic group distribution have been obtained. Besides, we have investigated the Fm-3m/Fd-3m type intergrowth and new type defects observed in the Fd-3m structure using transmission electron microscopy (TEM) and proposed a “polyhedron packing” model.

New amphoteric, inorganic amino acid with highly ordered mesopores were synthesized. Uniform distribution of acid and base organic groups on the mesopore surfaces were formed by interactions between the counter charged surfactant head groups and ionic parts of CSDAs. It has been demonstrated that organic (–NH2 and –COOH) pairs incorporated in the mesopore walls behave as natural amino acids, collectively exhibiting an isoelectric point of ~6.0. Moreover, we have demonstrated that the inorganic amino acid is an efficient catalyst for the reaction between aldehydes and carbon nucleophiles.

Place, publisher, year, edition, pages
Stockholm: Department of Materials and Environmental Chemistry (MMK), Stockholm University, 2010. 82 p.
Keyword
Mesoporous silica, Template synthesis, Functionalization, Electron microscopy, Defects, Crystal growth, Catalysis
National Category
Inorganic Chemistry
Research subject
Structural Chemistry
Identifiers
urn:nbn:se:su:diva-38398 (URN)978-91-7447-029-1 (ISBN)
Public defence
2010-05-18, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 16 B, Stockholm, 13:00 (English)
Opponent
Supervisors
Available from: 2010-04-26 Created: 2010-04-13 Last updated: 2010-04-14Bibliographically approved

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