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  • the characterization of wettability of substrates by liquid nanodrops

    نویسندگان :
    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/07/24
    • تاریخ انتشار در تی پی بین: 1392/07/24
    • تعداد بازدید: 492
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     wettability of substrates is characterized by a contact angle. applicability of the simple formula developed by derjaguin, which relates to the contact angle and disjoining pressure to nano-scale liquid droplets is reconsidered within the framework of the theory of the first-order wetting transition of volatile liquids. it is concluded that his formula is generally correct for large droplets on an incompletely-wettable substrate. but it cannot be applied to nanodroplets, in particular, on a completely-wettable substrate. an effective contact angle can be defined even for the nanodroplet. a formula similar to the derjaguin formula is proposed by which we can calculate the contact angle of nanodoroplets on both an incompletely- and a completely-wettable substrate for which the whole volume of the droplet is under the influence of the disjoining pressure.
     

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