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<b><span style="mso-fareast-font-family:"Times New Roman"">Peyman Irajizad PhD Defense
<o:p></o:p></span></b></p>
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<b><span style="mso-fareast-font-family:"Times New Roman"">Title</span></b><span style="mso-fareast-font-family:"Times New Roman"">: On Physics of Durable Ice Phobic Surfaces<o:p></o:p></span></p>
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<b><span style="mso-fareast-font-family:"Times New Roman"">Location:</span></b><span style="mso-fareast-font-family:"Times New Roman""> Eng building #1, Mechanical small conference room.<o:p></o:p></span></p>
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<b><span style="mso-fareast-font-family:"Times New Roman";
color:black">Committee Members</span></b><span style="mso-fareast-font-family:
"Times New Roman";color:black">: Dr. </span><span style="mso-fareast-font-family:
"Times New Roman"">Hadi Ghasemi, Dr. Dong
Liu, Dr. Megan Robertson, Dr. Rodolfo Ostilla Monico, Dr. Di Yang<o:p></o:p></span></p>
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<b style="mso-bidi-font-weight:normal"><span style="mso-fareast-font-family:"Times New Roman"">Date:
</span></b><span style="mso-fareast-font-family:"Times New Roman"">November 30, 2018<o:p></o:p></span></p>
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<b style="mso-bidi-font-weight:normal"><span style="mso-fareast-font-family:"Times New Roman"">Time:</span></b><span style="mso-fareast-font-family:"Times New Roman""> 2-4PM<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman""><o:p> </o:p></span></p>
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<b><span style="mso-fareast-font-family:"Times New Roman"">The abstract is </span></b><span style="mso-fareast-font-family:"Times New Roman"">:<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">Icephobic surfaces have a critical footprint on human daily lives ranging from<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">aviation systems and infrastructures to energy systems, but creation of these surfaces for<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">low-temperature applications remains elusive. Non-wetting, liquid-infused and hydrated<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">surfaces have inspired routes for development of icephobic surfaces. However, high<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">freezing temperature, high ice adhesion strength and subsequent ice accretion, low<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">mechanical durability, and high production cost have restricted their practical applications.<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">A comprehensive definition for icephobicity through thermodynamics, heat transfer and<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">mechanics of ice/water-material interface and elucidate physic-based routes was provided<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">through which nano-scale could help to achieve exceptional icephobic surfaces. Here, we<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">cast fundamentals of two new physical concept called magnetic slippery surfaces and<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">stress-localization to develop two new icephobic surfaces with extremely low adhesion and<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">exceptional mechanical, chemical and environmental durability.<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">In the first concept, we report a new magnetic slippery surface outperforming state-of-theart<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">icephobic surfaces with an ice formation temperature of -34 °C, 2-3 orders of magnitude<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">higher delay time in ice formation, extremely low ice adhesion strength (~2 Pa), and<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">stability in shear flows up to Reynolds number of 10</span><span style="font-size:6.0pt;
mso-fareast-font-family:"Times New Roman"">5</span><span style="mso-fareast-font-family:
"Times New Roman"">. In
these surfaces, we exploit the<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">magnetic volumetric force to exclude the role of solid-liquid interface in ice formation. We<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">show that these inexpensive surfaces are universal and can be applied to all types of solids<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">(no required micro/nano structuring) with no compromise to their unprecedented<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">properties. <o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">In stress localization method, new physical concept and corresponding material paradigm<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">to develop highly durable icephobic materials. These materials utilize stress-localization<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">function to initiate crack at the ice-material interface and consequently minimize ice<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">adhesion on the surface. Stress-localization leads to a shear force at the interface for<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">detachment of ice from the material. The developed concept is implemented in elastomers<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">and the superior icephobicity of these materials compared to state-of-the-art materials is<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">demonstrated. These forms of icephobic materials demonstrate excellent mechanical,<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">chemical and environmental durability with no change of characteristics under extreme air<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">and water shear flows. Furthermore, these icephobic materials does not change the<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">aerodynamic characteristics of airfoils thereby providing a promising solution for<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">aerospace application. In contrast to surface-modified coatings, the icephobicity of these<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">materials is a volumetric property and no degradation in the performance occurs in longterm<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">operation under mechanical loadings. The developed concept of stress-localization<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">reduces adhesion of solids on a material by an order of magnitude with no compromise in<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">mechanical properties. We envision that the developed physical concept opens a rational<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">route to minimize adhesion of any solid species (i.e. ice, gas hydrate, dust, and even biospecies)<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">on a surface with omnipresent application in transportation systems (aviation, cars<o:p></o:p></span></p>
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<span style="mso-fareast-font-family:"Times New Roman"">and vessels), energy/water systems, bio-sciences and even space systems..<o:p></o:p></span></p>
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<o:p> </o:p></p>
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