Silica Sol-gel coatings with improved light transmittance and stability

Lenke Kócs, Emőke Albert, Borbála Tegze, Márta Kabai-Faix, Csaba Major, András Szalai, Péter Basa, Zoltán Hórvölgyi

Research output: Contribution to journalArticle

5 Citations (Scopus)

Abstract

Silica sol-gel coatings on different substrate materials and their use as model systems have been studied. Mesoporous silica coatings with thicknesses of 85 - 135 nm and porosity of 18 ˗ 37% were prepared by dip-coating on polycarbonate and glass substrates. In order to eliminate the shrinkage of the porous structure acid or base vapour treatment was applied. Thickness and refractive index of the coatings were determined by analysing the transmittance spectra of the samples. Ellipsometric porosimetry measurements were carried out to determine the porosity, pore radius distribution, thickness and refractive index. The thickness of the samples was further confirmed by scanning electron microscopy. The adsorption capacity of the porous coatings was also studied by dye impregnation tests. The temporal stability of the samples was investigated by UV-Vis spectrometry and it was found that the advantageous optical properties (Tmax = 98 – 99%) of the samples remained constant even after a 1 year storage period.

Original languageEnglish
Pages (from-to)21-31
Number of pages11
JournalPeriodica Polytechnica Chemical Engineering
Volume62
Issue number1
DOIs
Publication statusPublished - Dec 1 2018

Keywords

  • Improved light transmittance
  • Long-term optical stability
  • Network strengthening
  • Porosity
  • Sol-gel coating

ASJC Scopus subject areas

  • Chemical Engineering(all)

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