Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 452740
Title Physical gels based on charge-driven bridging of nanoparticles by triblock copolymers
Author(s) Lemmers, M.; Spruijt, E.; Akerboom, S.; Voets, I.K.; Aelst, A.C. van; Cohen Stuart, M.A.; Gucht, J. van der
Source Langmuir 28 (2012)33. - ISSN 0743-7463 - p. 12311 - 12318.
DOI https://doi.org/10.1021/la301917e
Department(s) Physical Chemistry and Colloid Science
Laboratory of Cell Biology
Publication type Refereed Article in a scientific journal
Publication year 2012
Keyword(s) dynamic light-scattering - shear-induced gelation - nanocomposite hydrogels - formulation process - colloidal silica - aqueous-solution - reversible gels - micelles - macromolecules - adsorption
Abstract We have prepared an aqueous physical gel consisting of negatively charged silica nanoparticles bridged by ABA triblock copolymers, in which the A blocks are positively charged and the B block is neutral and water-soluble. Irreversible aggregation of the silica nanoparticles was prevented by precoating them with a neutral hydrophilic polymer. Both the elastic plateau modulus and the relaxation time increase slowly as the gel ages, indicating an increase both in the number of active bridges and in the strength with which the end blocks are adsorbed. The rate of this aging process can be increased significantly by applying a small shear stress to the sample. Our results indicate that charge-driven bridging of nanoparticles by triblock copolymers is a promising strategy for thickening of aqueous particle containing materials, such as water-based coatings.
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