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    A new measure of molecular attractions between nanoparticles near kT adhesion energy

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    Authors
    Kendall, Kevin
    Dhir, Aman
    Du, Shangfeng
    Issue Date
    2009-03
    
    Metadata
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    Abstract
    The weak molecular attractions of nanoparticles are important because they drive self-assembly mechanisms, allow processing in dispersions e.g. of pigments, catalysts or device structures, influence disease through the attraction of viruses to cells and also cause potential toxic effects through nanoparticle interference with biomolecules and organs. The problem is to understand these small forces which pull nanoparticles into intimate contact; forces which are comparable with 3kT/2z the thermal impact force experienced by an average Brownian particle hitting a linear repulsive potential of range z. Here we describe a new method for measuring the atomic attractions of nanoparticles based on the observation of aggregates produced by these small forces. The method is based on the tracking of individual monosize nanoparticles whose diameter can be calculated from the Stokes–Einstein analysis of the tracks in aqueous suspensions. Then the doublet aggregates are distinguished because they move slower and are also very much brighter than the dispersed nanoparticles. By finding the ratio of doublets to singlets, the adhesive energy between the particles can be calculated from known statistical thermodynamic theory using assumptions about the shape of the interaction potential. In this way, very small adhesion energies of 2kT have been measured, smaller than those seen previously by atomic force microscopy (AFM) and scanning tunneling microscopy (STM).
    Citation
    A new measure of molecular attractions between nanoparticles near kT adhesion energy 2009, 20 (27):275701 Nanotechnology
    Publisher
    IOP Publishing
    Journal
    Nanotechnology
    URI
    http://hdl.handle.net/2436/621460
    DOI
    10.1088/0957-4484/20/27/275701
    Additional Links
    http://stacks.iop.org/0957-4484/20/i=27/a=275701?key=crossref.66f88c62bd04e3110092137d6dc499f4
    Type
    Journal article
    Language
    en
    ISSN
    0957-4484
    1361-6528
    ae974a485f413a2113503eed53cd6c53
    10.1088/0957-4484/20/27/275701
    Scopus Count
    Collections
    Faculty of Science and Engineering

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