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UNDERSTANDING ICE AND WATER TRANSITIONS AT SOLID SURFACES FOR ANTI-ICING APPLICATION

Zhang, Yu
http://rave.ohiolink.edu/etdc/view?acc_num=akron1469799398

Abstract Details

2016, Doctor of Philosophy, University of Akron, Polymer Science.
Water and ice are ubiquitous in our lives and they play an important role in climatology, geology, and biology. Understanding the structure of water and how it freezes near solid surfaces is fundamentally and technologically important. The most common approaches of de-icing are decreasing ice nucleation rate, depressing melting temperature by salts and lowering the ice adhesion on surfaces. Firstly, adding salts to melt ice is also a common de-icing method. Here, we have studied the eff ect of common salt solutions on freezing of water next to a sapphire substrate by a surface sensitive technique (sum frequency generation spectroscopy), which could probe the orientation and molecular structure of buried interface. We fi nd that the brine layer prefers to be near the solid surface and this layer could serve as a lubricant to decrease the friction and adhesion of ice next to solid surface. Secondly, since the freezing of water on surfaces depends on many factors such as surface energy, water volume, surface area, roughness, and cooling rate, we have used sum frequency generation spectroscopy to study the freezing of water next to surfaces modifi ed by self-assembled monolayers and polymer coatings with varying surface energies. Wefi nd that the freezing temperature of water decreases with increasing surface hydrophobicity. We have also systematically studied how diff erent surface chemistry with the same structure a ects the stability of superhydrophobic surface, and further influence water condensation and anti-frost performance. In the last part, we have developed a method to combine humidity with the temperature stage in SFG system, and compared the frost formation with ice and water by SFG spectroscopy, which could help understand the crystal structure di fference of frost and ice and further our understanding of ice and water. These findings shed new light on understanding the key factors to decrease freezing temperature or delay freezing time at solid surfaces, which helps designing new surface coatings for anti-icing application.
Ali Dhinojwala (Advisor)
Toshikazu Miyoshi (Committee Chair)
Mesfin Tsige (Committee Member)
Abraham Joy (Committee Member)
Alamgir Karim (Committee Member)
201 p.
Physical Chemistry; Polymer Chemistry; Polymers
anti-icing, freezing, water, ice, sum frequency generation, optics, salt

Recommended Citations

Citations

  • Zhang, Y. (2016). UNDERSTANDING ICE AND WATER TRANSITIONS AT SOLID SURFACES FOR ANTI-ICING APPLICATION [Doctoral dissertation, University of Akron]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=akron1469799398

    APA Style (7th edition)

  • Zhang, Yu. UNDERSTANDING ICE AND WATER TRANSITIONS AT SOLID SURFACES FOR ANTI-ICING APPLICATION. 2016. University of Akron, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=akron1469799398.

    MLA Style (8th edition)

  • Zhang, Yu. "UNDERSTANDING ICE AND WATER TRANSITIONS AT SOLID SURFACES FOR ANTI-ICING APPLICATION." Doctoral dissertation, University of Akron, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1469799398

    Chicago Manual of Style (17th edition)

akron1469799398
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© 2016, some rights reserved.Creative Commons License UNDERSTANDING ICE AND WATER TRANSITIONS AT SOLID SURFACES FOR ANTI-ICING APPLICATION by Yu Zhang is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by University of Akron and OhioLINK.