BEGIN:VCALENDAR VERSION:2.0 PRODID:IEEE vTools.Events//EN CALSCALE:GREGORIAN BEGIN:VTIMEZONE TZID:Canada/Pacific BEGIN:DAYLIGHT DTSTART:20210314T030000 TZOFFSETFROM:-0800 TZOFFSETTO:-0700 RRULE:FREQ=YEARLY;BYDAY=2SU;BYMONTH=3 TZNAME:PDT END:DAYLIGHT BEGIN:STANDARD DTSTART:20201101T010000 TZOFFSETFROM:-0700 TZOFFSETTO:-0800 RRULE:FREQ=YEARLY;BYDAY=1SU;BYMONTH=11 TZNAME:PST END:STANDARD END:VTIMEZONE BEGIN:VEVENT DTSTAMP:20201221T213120Z UID:C64C419E-F22A-4087-8973-110D184E6932 DTSTART;TZID=Canada/Pacific:20201218T130000 DTEND;TZID=Canada/Pacific:20201218T140000 DESCRIPTION:Abstract: Hydrophobic surfaces that are robust can have widespr ead applications in various industries including energy\, hydropower\, and transportation. Existing durable materials such as metals and ceramics ar e generally hydrophilic and require polymeric modifiers to render them hyd rophobic\, but these modifiers deteriorate in harsh environments. Therefor e\, robust hydrophobic surfaces have been difficult to realize and their w idespread applicability has been limited. In this talk\, the class of cera mics comprising the lanthanide series rare-earth oxides (REOs) will be dis cussed for their potential in enhancing the longevity of sustainable energ y systems by repelling water. The unique electronic structure of the rare- earth metal atom inhibits hydrogen bonding with interfacial water molecule s resulting in a hydrophobic hydration structure where the surface oxygen atoms are the only hydrogen bonding sites. Despite being inherently hydrop hobic\, the presence of excess surface oxygen on REOs can lead to increase d hydrogen bonding and thereby reduce their hydrophobicity. Using X-ray Ph otoelectron Spectroscopy (XPS) and wetting measurements\, surface stoichio metry and surface relaxations have been shown to impact wetting properties of REOs. Specifically\, freshly sputtered ceria is shown to be hydrophili c due to excess surface oxygen (shown to have an O/Ce ratio of ~3)\, which when relaxed in a clean\, ultra-high vacuum environment isolated from air borne hydrocarbons reaches close to stoichiometric O/Ce ratio (~2.2) and b ecomes hydrophobic. We also demonstrate that thin-film coatings (~300 nm) of hydrophobic REOs show sustained dropwise condensation behaviour for ove r 100 hours at accelerated saturated steam conditions without compromising structural integrity or hydrophobicity\, and produce a tenfold enhancemen t in the heat transfer co-efficient (103 ± 5 kW/m2K) compared to conventi onal filmwise condensation (usually <10 kW/m2K). We will discuss applicati ons of such hydrophobic surfaces in electronic devices and discuss embodim ents with self-healing lubricant-infused surfaces that can provide corrosi on protection in sustainable energy systems.\n\nSpeaker(s): Dr. Sami Khan\ , \n\nBurnaby\, British Columbia\, Canada\, V5A 1S6\, Virtual: https://eve nts.vtools.ieee.org/m/250828 LOCATION:Burnaby\, British Columbia\, Canada\, V5A 1S6\, Virtual: https://e vents.vtools.ieee.org/m/250828 ORGANIZER:mmadachi@sfu.ca SEQUENCE:1 SUMMARY:IEEE Electron Device Invited Talk by Dr. Sami Khan\, Simon Fraser U niversity - Robust Hydrophobic Surfaces for Enhancing Longevity of Sustain able Energy Systems URL;VALUE=URI:https://events.vtools.ieee.org/m/250828 X-ALT-DESC:Description: <br /><p><strong>Abstract:</strong> Hydrophobic sur faces that are robust can have widespread applications in various industri es including energy\, hydropower\, and transportation. Existing durable ma terials such as metals and ceramics are generally hydrophilic and require polymeric modifiers to render them hydrophobic\, but these modifiers deter iorate in harsh environments. Therefore\, robust hydrophobic surfaces have been difficult to realize and their widespread applicability has been lim ited. In this talk\, the class of ceramics comprising the lanthanide serie s rare-earth oxides (REOs) will be discussed for their potential in enhanc ing the longevity of sustainable energy systems by repelling water. The un ique electronic structure of the rare-earth metal atom inhibits hydrogen b onding with interfacial water molecules resulting in a hydrophobic hydrati on structure where the surface oxygen atoms are the only hydrogen bonding sites. Despite being inherently hydrophobic\, the presence of excess surfa ce oxygen on REOs can lead to increased hydrogen bonding and thereby reduc e their hydrophobicity. Using X-ray Photoelectron Spectroscopy (XPS) and w etting measurements\, surface stoichiometry and surface relaxations have b een shown to impact wetting properties of REOs. Specifically\, freshly spu ttered ceria is shown to be hydrophilic due to excess surface oxygen (show n to have an O/Ce ratio of ~3)\, which when relaxed in a clean\, ultra-hig h vacuum environment isolated from airborne hydrocarbons reaches close to stoichiometric O/Ce ratio (~2.2) and becomes hydrophobic. We also demonstr ate that thin-film coatings (~300 nm) of hydrophobic REOs show sustained d ropwise condensation behaviour for over 100 hours at accelerated saturated steam conditions without compromising structural integrity or hydrophobic ity\, and produce a tenfold enhancement in the heat transfer co-efficient (103 &plusmn\; 5 kW/m<sup>2</sup>K) compared to conventional filmwise cond ensation (usually &lt\;10 kW/m<sup>2</sup>K). We will discuss applications of such hydrophobic surfaces in electronic devices and discuss embodiment s with self-healing lubricant-infused surfaces that can provide corrosion protection in sustainable energy systems.</p>\n<p>&nbsp\;</p> END:VEVENT END:VCALENDAR