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    Molecular tilt on monolayer-protected nanoparticles

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    Type
    Article
    Authors
    Giomi, L.
    Bowick, M. J.
    Ma, X.
    Majumdar, A.
    KAUST Grant Number
    KUK-C1-013-04
    Date
    2012-02-06
    Online Publication Date
    2012-02-06
    Print Publication Date
    2012-02-01
    Permanent link to this record
    http://hdl.handle.net/10754/598881
    
    Metadata
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    Abstract
    The structure of the tilted phase of monolayer-protected nanoparticles is investigated by means of a simple Ginzburg-Landau model. The theory contains two dimensionless parameters representing the preferential tilt angle and the ratio ε between the energy cost due to spatial variations in the tilt of the coating molecules and that of the van der Waals interactions which favors the preferential tilt. We analyze the model for both spherical and octahedral particles. On spherical particles, we find a transition from a tilted phase, at small ε, to a phase where the molecules spontaneously align along the surface normal and tilt disappears. Octahedral particles have an additional phase at small ε characterized by the presence of six topological defects. These defective configurations provide preferred sites for the chemical functionalization of monolayer-protected nanoparticles via place-exchange reactions and their consequent linking to form molecules and bulk materials. Copyright © EPLA, 2012.
    Citation
    Giomi, L., Bowick, M. J., Ma, X., & Majumdar, A. (2012). Molecular tilt on monolayer-protected nanoparticles. EPL (Europhysics Letters), 97(3), 36005. doi:10.1209/0295-5075/97/36005
    Sponsors
    LG and MJB would like to thank F. STELLACCI for the insightful conversations that inspired this work. MJB thanks T. ASEFA for enlightening discussions of the chemistry of SAMs. We gratefully acknowledge support from the Wyss Institute (LG), the Harvard Kavli Institue for Bionano Science & Technology (LG), the NSF Harvard MRSEC (LG). The work of MJB and XM was supported by the National Science Foundation grant DMR-0808812. AM is supported by Award No. KUK-C1-013-04, made by King Abdullah University of Science and Technology (KAUST), to the Oxford Centre for Collaborative Applied Mathematics and an EPSRC Career Acceleration Fellowship EP/J001686/1.
    Publisher
    IOP Publishing
    Journal
    EPL (Europhysics Letters)
    DOI
    10.1209/0295-5075/97/36005
    ae974a485f413a2113503eed53cd6c53
    10.1209/0295-5075/97/36005
    Scopus Count
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