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Hierarchical Nanoporous Silica Films for Wear Resistant Antireflection Coatings
journal contribution
posted on 2015-09-02, 00:00 authored by Norihiro Mizoshita, Masahiko Ishii, Naohiko Kato, Hiromitsu TanakaHigh-performance
antireflection (AR) layers were prepared by depositing hierarchical
nanoporous silica films on glass substrates. We designed a composite
layer consisting of mesoporous silica nanoparticles (MSNs) and a mesoporous
silica matrix. The introduction of bimodal nanoporous structures,
i.e., independent nanopore formation within the MSN and within the
matrix, was achieved by using surface-protected MSNs and a polymeric
nonionic surfactant template during the fabrication process. A porosity
of more than 40% was achieved for composite AR materials. The protrusion
of MSNs from the matrix led to spontaneous formation of nanoscale
roughness on the surface of the coatings, which enhanced the AR properties.
The solid bonding of the MSNs to the nanoporous matrices played an
important role in the achievement of high mechanical durability. The
optimal nanoporous coating, which contained ca. 50 wt % MSN, exhibited
high transparency (91.5–97.5%) and low reflectance (<2.2%),
over the whole range of visible light wavelengths, and sufficient
wear resistance.
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nanoporous matricesglass substratesMSNHierarchical Nanoporous Silica FilmsAR materialsAR propertiesnanopore formationsurfactant templatebimodal nanoporous structuresnanoporous coatingmesoporous silica matrixmesoporous silica nanoparticleslight wavelengthsnanoscale roughnessfabrication processnanoporous silica films
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