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      Colloidal gels: equilibrium and non-equilibrium routes

      Journal of Physics: Condensed Matter
      IOP Publishing

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          A DNA-based method for rationally assembling nanoparticles into macroscopic materials.

          Colloidal particles of metals and semiconductors have potentially useful optical, optoelectronic and material properties that derive from their small (nanoscopic) size. These properties might lead to applications including chemical sensors, spectroscopic enhancers, quantum dot and nanostructure fabrication, and microimaging methods. A great deal of control can now be exercised over the chemical composition, size and polydispersity of colloidal particles, and many methods have been developed for assembling them into useful aggregates and materials. Here we describe a method for assembling colloidal gold nanoparticles rationally and reversibly into macroscopic aggregates. The method involves attaching to the surfaces of two batches of 13-nm gold particles non-complementary DNA oligonucleotides capped with thiol groups, which bind to gold. When we add to the solution an oligonucleotide duplex with 'sticky ends' that are complementary to the two grafted sequences, the nanoparticles self-assemble into aggregates. This assembly process can be reversed by thermal denaturation. This strategy should now make it possible to tailor the optical, electronic and structural properties of the colloidal aggregates by using the specificity of DNA interactions to direct the interactions between particles of different size and composition.
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            Interaction between particles suspended in solutions of macromolecules

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              Fluids with highly directional attractive forces. I. Statistical thermodynamics

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                Author and article information

                Journal
                Journal of Physics: Condensed Matter
                J. Phys.: Condens. Matter
                IOP Publishing
                0953-8984
                1361-648X
                August 15 2007
                August 15 2007
                July 17 2007
                : 19
                : 32
                : 323101
                Article
                10.1088/0953-8984/19/32/323101
                09ebb375-3f31-4c7e-9bc0-62fc6338c5b8
                © 2007
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