Template-free sol-gel synthesis of hierarchically macro- and mesoporous monolithic TiO2

A1 Originalartikel i en vetenskaplig tidskrift (referentgranskad)


Interna författare/redaktörer


Publikationens författare: Syefan Backlund, Jan-Hemrik Smatt, Jarl B.Rosenholm, Mika Linden
Förläggare: TAYLOR & FRANCIS INC
Publiceringsår: 2007
Tidskrift: Journal of Dispersion Science and Technology
Tidskriftsakronym: J DISPER SCI TECHNOL
Volym: 28
Artikelns första sida, sidnummer: 115
Artikelns sista sida, sidnummer: 119
Antal sidor: 5
ISSN: 0193-2691
eISSN: 1532-2351


Abstrakt

Monolithic titania exhibiting a hierarchical, bimodal meso-macroporosity has been prepared through a template free sol-gel synthesis route. The macropore diameter can be controllably varied in the range 0.4-4 mu m still maintaining a narrow pore size distribution. The macropores form as a consequence of parallel gelation and microscopic phase separation, where their relative kinetics determine the macropore diameter. We utilize the chelating property of acetic acid to control the kinetics of the reaction, which allows the synthesis to be carried out without the addition of otherwise commonly used hydrogen-bonding polymers or surfactants. The synthesis is thus both interesting from an economical and an environmental point of view. In addition to macropores, the monoliths also contain textural mesopores, which makes the monoliths interesting for chromatographic and catalytic applications.


Nyckelord

hierarchical, macroporous, Monolith, titania

Senast uppdaterad 2020-26-02 vid 01:23