Nanoporosity-driven superhydrophilicity: a means to create multifunctional antifogging coatings

Langmuir : the ACS Journal of Surfaces and Colloids
Fevzi C CebeciMichael F Rubner

Abstract

Multifunctional nanoporous thin films have been fabricated from layer-by-layer assembled silica nanoparticles and a polycation. The resultant multilayer films were found to exhibit both antifogging and antireflection properties. The antifogging properties are a direct result of the development of superhydrophilic wetting characteristics (water droplet contact angle <5 degrees within 0.5 s or less). The nearly instantaneous sheetlike wetting promoted by the superhydrophilic multilayer prevents light scattering water droplets from forming on a surface. The low refractive index of the multilayer film (as low as 1.22) resulting from the presence of nanopores was found to impart excellent antireflection properties. Glass slides coated on both sides with a nanoporous multilayer film exhibited transmission levels as high as 99.8%. Stable superhydrophilic wetting characteristics were obtained only after a critical number of bilayers were deposited onto a surface. The assembly conditions (solution pH and nanoparticle concentration), as well as the choice of nanoparticle size, were found to strongly influence film properties. It is suggested that the superhydrophilic behavior is driven by the rapid infiltration of water into a 3D nanopor...Continue Reading

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Citations

Apr 18, 2013·International Journal of Pharmaceutics·Jan Henrik FinkeChristel C Müller-Goymann
Mar 19, 2011·ACS Applied Materials & Interfaces·Xin Du, Junhui He
Jul 5, 2012·ACS Applied Materials & Interfaces·Laura IntrozziStefano Farris
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Mar 18, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·T TóthC Semprebon
Jul 7, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Beom Seok KimHyung Hee Cho
Jul 21, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Hyunsu KimSungho Jin
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