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  • Title: A facile route to reassemble titania nanoparticles into ordered chain-like networks on substrate.
    Author: Cheng YJ, Wolkenhauer M, Bumbu GG, Gutmann JS.
    Journal: Macromol Rapid Commun; 2012 Feb 13; 33(3):218-24. PubMed ID: 22184038.
    Abstract:
    A facile route to reassemble titania nanoparticles within the titania-block copolymer composite films has been developed. The titania nanoparticles templated by the amphiphilic block copolymer of poly(styrene)-block-poly (ethylene oxide) (PS-b-PEO) were frozen in the continuous PS matrix. Upon UV exposure, the PS matrix was partially degraded, allowing the titania nanoparticles to rearrange into chain-like networks exhibiting a closer packing. The local structures of the Titania chain-like networks were investigated by both AFM and SEM; the lateral structures and vertical structures of the films were studied by GISAXS and X-ray reflectivity respectively. Both the image analysis and X-ray scattering characterization prove the reassembly of the titania nanoparticles after UV exposure. The mechanism of the nanoparticle assembly is discussed.
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