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Mesostructured materials: Synthesis towards applications
Stockholm University, Faculty of Science, Department of Physical, Inorganic and Structural Chemistry.
2007 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

A new class of materials with well-defined structures on mesoscopic (2-50 nm) length scales has attracted considerable interest during the last decade. These mesostructured mataterials are formed from the self-assembly of amphiphillic molecules and inorganic precursors. The aim of this thesis has been to develop preparation methods that are scalable, and at the same time allow for efficient structural control coupled with possibility to incorporate different functionalities.

Two different industrial processes for production of particles with spherical morphology were successfully tailored for synthesis of well-ordered mesostructured particles. An existing spray drying method for a fast and continuous production was further developed, and for the first time, an emulsion-based method was implemented. The latter method resulted in superior control of both particle size and internal mesostructure.

Mesostructured photochromic pigments were synthesised by incorporating photochromic dyes in the organic domains of the surfactant templated inorganic/organic mesostructured silica particles. The pigments were produced using a one-pot synthesis method employing an aerosol reactor, allowing control over both the internal mesostructure and the dye content. We show that transparent photochromic films can be prepared using latex binders and conventional coating technology.

Mesoporous magnetic carrier materials were prepared by adding iron oxide nanoparticles during either the emulsion- or aerosol processing. The surfactant templated silica matrix displayed well-ordered internal pore architecture with limited pore blocking caused by the incorporated iron oxide nanoparticles. The iron oxide content was precisely controlled, and the magnetic properties were preserved during the processing. Finally we demonstrate that these materials can be used to magnetically separate water-soluble dyes from solution.

Place, publisher, year, edition, pages
Stockholm: Institutionen för fysikalisk kemi, oorganisk kemi och strukturkemi , 2007. , p. 83
National Category
Organic Chemistry
Research subject
Inorganic Chemistry
Identifiers
URN: urn:nbn:se:su:diva-6584ISBN: 91-7155-368-1 (print)OAI: oai:DiVA.org:su-6584DiVA, id: diva2:196694
Public defence
2007-02-23, Magnélisalen, Kemiska övningslaboratoriet, Svante Arrhenius väg 12 A, Stockholm, 13:00
Opponent
Supervisors
Available from: 2007-02-01 Created: 2007-01-26Bibliographically approved
List of papers
1. Structural features and adsorption behaviour of mesoporous silica particles formed from droplets generated in a spraying chamber
Open this publication in new window or tab >>Structural features and adsorption behaviour of mesoporous silica particles formed from droplets generated in a spraying chamber
2004 In: Microporous and Mesoporous Materials, ISSN 1387-1811, Vol. 72, no 1-3, p. 175-183Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24073 (URN)
Note
Part of urn:nbn:se:su:diva-6584Available from: 2007-02-01 Created: 2007-01-26Bibliographically approved
2. Aerosol based synthesis of mesostructured particles using ammonia gas as a condensation promoter
Open this publication in new window or tab >>Aerosol based synthesis of mesostructured particles using ammonia gas as a condensation promoter
In: Microporous and Mesoporous MaterialsArticle in journal (Refereed) Submitted
Identifiers
urn:nbn:se:su:diva-24074 (URN)
Note
Part of urn:nbn:se:su:diva-6584Available from: 2007-02-01 Created: 2007-01-26Bibliographically approved
3. Combined Emulsion and Solvent Evaporation (ESE) Synthesis Route to Well-Ordered Mesoporous Materials
Open this publication in new window or tab >>Combined Emulsion and Solvent Evaporation (ESE) Synthesis Route to Well-Ordered Mesoporous Materials
2007 In: Langmuir, ISSN 0743-7463, Vol. 23, no 3, p. 1459-1464Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24075 (URN)
Note
Part of urn:nbn:se:su:diva-6584Available from: 2007-02-01 Created: 2007-01-26Bibliographically approved
4. Photochromic mesostructured silica pigments dispersed in latex films
Open this publication in new window or tab >>Photochromic mesostructured silica pigments dispersed in latex films
Show others...
2005 In: Journal of Materials Chemistry, ISSN 0959-9428, Vol. 15, no 34, p. 3507-3513Article in journal (Refereed) Published
Identifiers
urn:nbn:se:su:diva-24076 (URN)
Note
Part of urn:nbn:se:su:diva-6584Available from: 2007-02-01 Created: 2007-01-26Bibliographically approved
5. One-Pot Synthesis of Well-Ordered Mesoporous Magnetic Carriers
Open this publication in new window or tab >>One-Pot Synthesis of Well-Ordered Mesoporous Magnetic Carriers
2007 (English)In: Journal of Materials Chemistry, ISSN 0959-9428, E-ISSN 1364-5501, Vol. 17, p. 2700-2705Article in journal (Refereed) Published
Abstract [en]

The facile preparation of a mesoporous magnetic carrier technology is demonstrated. The micron-sized spherical mesostructured particles are prepared using a newly-developed, one-step, combined emulsion and solvent evaporation (ESE) method. The surfactant-templated silica matrix display a well-ordered internal pore architecture. Very limited pore blocking, and only to a limited degree disordered- or worm-like structures are observed, induced by the iron oxide nanoparticles added to provide the superparamagnetic properties.The iron oxide content was precisely controlled, and the magnetic properties were well preserved during the process. Finally we demonstrate the applicability of the magnetically separable mesoporous material as an adsorbent for specific dissolved materials from dilute aqueous solutions.

National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:su:diva-24077 (URN)10.1039/B618502A (DOI)
Note
Part of urn:nbn:se:su:diva-6584Available from: 2007-02-01 Created: 2007-01-26 Last updated: 2017-12-13Bibliographically approved

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