SIPS 2018

DETAILLED PROGRAM OVERVIEW

The Multi-layer Structures Based on TiO2 for Multifunctional Glazing Surface
Luminita Andronic¹;
¹TRANSILVANIA UNIVERSITY OF BRASOV, Brasov, Romania;
PAPER: 215/AdvancedMaterials/Regular (Oral)
SCHEDULED: 14:50/Wed./Grego (50/3rd)

ABSTRACT:
Multi-layer structures based on TiO2 have been designed, developed, and assembled into functional nanostructures at the molecular-level to control the materials' properties. Controlling microstructure and homogeneity of nano-sized materials with well-defined properties will be done by sol-gel method and dip-coating methods. Due to the possibility of controlling the hydrolysis, condensation, and densification processes, the sol-gel method offers the opportunity to synthesize a large variety of new materials. The glazing surfaces with photocatalytic water pollutants decontamination, low-E and thermochromic properties were obtained by epitaxial growth of nanostructures on commercial low-E glass substrate, thus ensuring multi-functionality of existing materials on the market, for the next generation of integrated windows in buildings with low energy consumption. The thin films with multi-layers structure had following structure: substrate (low-E glass)/layer 1/layer2. Layer 1 is an oxide thin film of TiO2 formed on the substrate, and acts as a barrier to prevent Na+ from diffusing into the thermochromic layer. Layer 2 is a thermochromic layer of VxOy. Characterisation of coating on low-E glass in terms of crystallinity, roughness, morphology, band gap energy, functional properties of glazing, and optical properties (transmittance, reflectance, and absorbance) will be performed. Materials that have transmittance of <70% are considered non-compliant with the target of at least 80% for which the glazing had kept the visual comfort. The coatings passed the stability and durability tests in climate chamber, humidity, salt spray testing, and exposure of glazing to a dry atmosphere at a temperature of 0-50°C, according to the ISO/ASTM standards. Photocatalysis standard tests of pollutants degradation consist in efficiency evaluate of methylene blue (MB) photodegradation in aqueous solution, according ISO 10678/2010.

References:
[1] A. Hosein, G. Hoseini, N. Dalilah Dahlan, U. Berardi, A. Ghaffarian Hoseini, N. Makaremi, M. Ghaffarian Hoseini, Renewable and Sustainable Energy Reviews 25 (2013) 1-17.
[2] K. Midtdal, P. Jelle, Bjorn, Solar Energy Materials and Solar Cells 109 (2013) 126-141.
[3] L. Long, H. Ye, Solar Energy 107 (2014) 236-244.