Publication: The effect of surface chemistry on anti-soiling properties of transparent perfluoroalkyl and alkyl modified silica coatings
Program
KU Authors
Co-Authors
Taheri, Saba
Motlagh, Fatemeh Hosseinpour
Dehestanizad, Sina
Yahyaei, Hossein
Zarrabi, Ali
Tehrani, Abolfazl Golmohammadian
Makki, Hesam
Advisor
Publication Date
Language
English
Type
Journal Title
Journal ISSN
Volume Title
Abstract
Various physical and chemical surface parameters, e.g., surface roughness and surface chemistry, contribute to anti-soiling (AS) properties. Nevertheless, the effect of surface chemistry has not been distinctly elucidated yet. In this study, a set of mechanically stable and durable hydrophobic AS coatings with controlled surface chemistry were synthesized, while surface roughness was kept below 1 nm. Fluoroalkylsilane (FAS), alkylsilane (AL), and tetraethyl orthosilicate (TEOS) were employed for synthesis. Surface chemistry and surface roughness were quantified by XPS and AFM. A soiling lab simulator was designed to accelerate the soiling process. AS properties were quantified by UV-vis spectroscopy and optical microscopy. The surface free energy of coatings was estimated through (polar and apolar liquids) contact angle measurements (ranging from 16 to 30 mN/m), and a clear correlation was discovered between the AS properties and surface free energy. Moreover, mechanical properties and weathering resistance of the coatings were analyzed by nano-indentation and QUV accelerated weathering tester. While all coatings showed acceptable AS properties (transmission loss after dust deposition between 1/5 and 2/5 of uncoated glass) and excellent mechanical strength (above 27 GPa modulus and 2 GPa hardness), FAS-based coatings showed a significantly higher durability against weathering as compared to the AL-based ones.
Description
Source:
Surfaces and Interfaces
Publisher:
Elsevier
Keywords:
Subject
Chemistry, Physical chemistry, Materials Science, Coatings, Films, Physics, Applied physics, Condensed Matter