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Open Access Field-controlled Self-assembly and Disassembly of Colloidal Nanoparticles

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Self-assembly of nanoparticles is one of the most promising methods for the preparation of novel materials and devices with exceptional properties. In order to control nanoparticles self-assembly, an understanding of their interactions is absolutely necessary. One convenient way to achieve a control on their interaction is through the use of external fields. Here we provide two different examples of how interparticle interactions are affected by interactions with external fields. In the first case, magnetic fields are used to induce dipolar interactions among concentrated suspension of superparamagnetic nanocolloids, which cause them to self-assemble into dense chain-like anisotropic structures, used as templates for the growth of porous materials with tunable properties. In the second case, it is shown how more commonly employed but less understood flow fields interact with clusters of particles, and lead to their restructuring or disassembly depending upon the shear stress applied.

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Keywords: CLUSTER DISASSEMBLY; FLOW FIELDS; MAGNETIC FIELDS; NANOPARTICLE SELF-ASSEMBLY; POROUS MATERIALS

Document Type: Research Article

Affiliations: ETH Zürich, Department of Chemistry and Applied Biosciences, Institute for Chemical and Bioengineering, Wolfgang Pauli Strasse 10, CH-8093 Zürich, Switzerland

Publication date: 01 October 2011

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  • International Journal for Chemistry and Official Membership Journal of the Swiss Chemical Society (SCS) and its Divisions

    CHIMIA, a scientific journal for chemistry in the broadest sense, is published 10 times a year and covers the interests of a wide and diverse readership. Contributions from all fields of chemistry and related areas are considered for publication in the form of Review Articles and Notes. A characteristic feature of CHIMIA are the thematic issues, each devoted to an area of great current significance.

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