Nanosilica Coating for Retarding Dew Formation

摘要

The present disclosure relates to silica nanoparticle coatings and articles, such as in particular retro-reflective devices, bearing silica nanoparticle coatings thereon. The present disclosure is also directed to a method for retarding dew formation on the surface of an article, in particular an article comprising a retro-reflective support.

主权项

1. A method for retarding dew formation on the surface of an article comprising a retro-reflective support, the method comprising the steps of:
a) providing a substrate; b) contacting at least part of the surface of said substrate with a silica nanoparticle coating composition comprising:
i. an aqueous dispersion of a mixture of silica nanoparticles having an average particle diameter of 40 nanometers or less and silica nanoparticles having an average particle diameter greater than 40 nanometers, said aqueous dispersion having a pH of less than 5, andii. an acid having a pKa of less than 5; c) drying said coating composition so as to provide a silica nanoparticle coating onto said substrate, and thereby forming a coating assembly; and d) applying said coating assembly onto at least part of said retro-reflective support.