Heat conduction in nano-environment observed in cooling processes of colloidal silver nanoparticles in water

Akira Harata, Jyunya Taura, Teiichiro Ogawa

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    Abstract

    Ultrafast dynamics of colloidal silver nanoparticles in an aqueous solution was investigated by observing the ultrafast lensing effects caused by a photo-induced refractive index change. The ultrafast response consisted of an instantaneous peak by the optical Kerr effect and a subsequent bi-exponential decay component. The decay component was independent of the relative polarization planes of pump and probe beams and had temperature-dependent time constants ranging from 0.4 to 2.2 ps and from 10 to 100 ps. A minimum at around 7°C was found for the time constant of the fast component. The results suggest that the structure of water molecules adjacent to the silver surface is affected by hydrogen bonds in a temperature-dependent manner similar to that of the molecular structure of bulk water.

    Original languageEnglish
    Pages (from-to)2909-2912
    Number of pages4
    JournalJapanese Journal of Applied Physics, Part 1: Regular Papers and Short Notes and Review Papers
    Volume39
    Issue number5 B
    Publication statusPublished - Dec 1 2000

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    All Science Journal Classification (ASJC) codes

    • Engineering(all)
    • Physics and Astronomy(all)

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