Functional Coatings for Anti-Wetting and Ice Shedding Applications
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Authors
Buddingh, Jasmine
Date
Type
thesis
Language
eng
Keyword
Coatings , Polymer , Anti-wetting , Ice shedding , Poly(dimethylsiloxane)
Alternative Title
Abstract
When ice accumulates on modern infrastructures, it often leads to many different problems ranging from moderate inconveniences to impeding functionality, and even catastrophic failures. Current methods for dealing with ice typically consist of reactively removing it by mechanical, thermal, or chemical means – none of which are very efficient, quick, or cheap. A more practical approach would be to design a coating that could passively prevent the ice from adhering to the surface in the first place.
After a thorough review of the major classes of liquid-repellent surfaces, inspirations were taken from these to extend this repellency towards ice and design two different coatings with long-lasting ice shedding properties. The first consisted of a thermo-responsive organogel which provides a slippery liquid surface at low temperatures when icing is prevalent, while minimizing losses of lubricant at higher temperatures when icing is not likely. The temperature for the transition between the slippery liquid and dry surfaces could be tuned based on the mixing ratio of fluorinated and non-fluorinated silicone oils in the lubricant mixture. This method allowed for repeatedly low ice adhesion strengths over at least 50 icing/de-icing cycles, but the inherent softness of the organogel makes this coating unsuitable for certain harsher applications.
The second example consisted of a durable coating that could be more widely applicable. In this case, a durable epoxy coating was prepared with a liquid-like surface consisting of flexible polydimethylsiloxane (PDMS) chains. This was done by incorporating PDMS chains into a graft-copolymer. This liquid-like surface was then doped with small amounts of silicone oil to create a slippery liquid surface upon which ice could easily slide. This easy ice removal was repeatable over at least 30 cycles of icing/de-icing.
While the latter coatings showed considerable hardness and durability, they are still not durable enough to withstand the high-speed impact and erosion that occurs on the leading edge of plane wings. Future work would therefore consist of designing new coatings with high hardness and durability being the primary objective. Due to the high shear nature of the application, some compromises could be made in the ice shedding properties as the secondary objective.
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ProQuest PhD and Master's Theses International Dissemination Agreement
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Copying and Preserving Your Thesis
This publication is made available by the authority of the copyright owner solely for the purpose of private study and research and may not be copied or reproduced except as permitted by the copyright laws without written authority from the copyright owner.