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Seminar 2/4/2015 - Gareth McKinley, Massachusetts Institute of Technology: Designing Omniphobic Surfaces Using Nanostructured Coatings

Feb 4, 2015  ·  12:00 p.m. 1:00 p.m.  ·  Bowen Hall Auditorium

Title: Designing Omniphobic Surfaces Using Nanostructured Coatings: Applications in Super Liquid Repellency, Ice-phobicity, Friction Reduction & Fog-Harvesting

Abstract: Many different structured surfaces with a wide range of surface chemistries and topographies have been investigated for controlling the wetting (or non wetting) properties of a fluid/solid interface. Experimental advances in nanofabrication have led to the ability to achieve unprecedented control over the micro- and nano-texture of a substrate and this can result in almost perfect ultrahydrophobicity. Very few structured surfaces to date, however, have been able to achieve super-oleophobicity; i.e. resistance to wetting by low interfacial tension liquids such as hydrocarbons. Fluorinated silsequioxanes are nanometer-scale caged molecules that can be heavily fluorinated and molecularly dispersed in a range of polymers to systematically control both the hydrophobicity and oleophobicity (oil-repellency) of polymer substrates. Microtextured re-entrant structures coated with FluoroPOSS are the most oleophobic surfaces produced to date, with alkane contact angles greater than 160 degree and low wetting hysteresis. We have also developed single-step dip-coating and spray-coating processes for applying such coatings to a wide-range of substrates. Applications of these nanostructured coatings include fabrics with enhanced solvent/oil resistance, surfaces for reducing environmental fouling and frictional dissipation, efficient separation of oil/water dispersions, reduction of ice- and gas hydrate-adhesion as well as ‘fog-harvesting surfaces’ that greatly enhance our ability to collect solar-desalinated water from wind-borne fog.

All seminars are held on Wednesdays from 12:00 noon-1:00 p.m. in the Bowen Hall Auditorium Room 222. A light lunch is provided at 11:30 a.m. in the Bowen Hall Atrium immediately prior to the seminar.

Seminar 2/25/2015 - Dean DeLongchamp, NIST: Structure Measurements for Organic Photovoltaics and Manufacturing

Feb 25, 2015  ·  12:00 p.m. 1:00 p.m.  ·  Bowen Hall Auditorium

Abstract: Organic photovoltaics (OPV) is a promising candidate technology for the low-cost fabrication of modules to harvest solar energy.  Although OPV technology has significantly matured over the past few years, there remain significant challenges in addressing the gap between lab-scale devices and real manufacturing. Structure-property-performance relationships for OPV devices are still underdeveloped, and relationships based on one system are not necessarily transferrable to new, higher-performance systems. This talk will describe our efforts to develop measurements that support OPV manufacturing. Using a blade coating process as a prototype for slot-die coating, we have developed several techniques to observe the structure of OPV films in-situ as they dry. Our measurements include synchrotron-based X-ray scattering and a variety of optical methods. We use these techniques to identify the mechanisms by which formulation and processing choices influence the nanoscale structure of the films. Several OPV systems will be described including polymer/fullerene, small-molecule/fullerene, and polymer/polymer. Throughout solidification, we can follow the number of phases, their composition, and the extent of order within them. In-situ techniques provide far more information about the solidification process than can be obtained by measuring already-dried films, providing a valuable tool to guide the selection of formulation and processing parameters.

All seminars are held on Wednesdays from 12:00 noon-1:00 p.m. in the Bowen Hall Auditorium Room 222. A light lunch is provided at 11:30 a.m. in the Bowen Hall Atrium immediately prior to the seminar.

Seminar 3/11/2015 - Andre Taylor, Yale University

Mar 11, 2015  ·  12:00 p.m. 1:00 p.m.  ·  Bowen Hall Auditorium

All seminars are held on Wednesdays from 12:00 noon-1:00 p.m. in the Bowen Hall Auditorium Room 222. A light lunch is provided at 11:30 a.m. in the Bowen Hall Atrium immediately prior to the seminar.

Seminar 3/25/2015 - Surita Bhatia, SUNY Stony Brook

Mar 25, 2015  ·  12:00 p.m. 1:00 p.m.  ·  Bowen Hall Auditorium

All seminars are held on Wednesdays from 12:00 noon-1:00 p.m. in the Bowen Hall Auditorium Room 222. A light lunch is provided at 11:30 a.m. in the Bowen Hall Atrium immediately prior to the seminar.

Seminar 4/1/2015 - Martin Bazant, Massachusetts Institute of Technology

Apr 1, 2015  ·  12:00 p.m. 1:00 p.m.  ·  Bowen Hall Auditorium

All seminars are held on Wednesdays from 12:00 noon-1:00 p.m. in the Bowen Hall Auditorium Room 222. A light lunch is provided at 11:30 a.m. in the Bowen Hall Atrium immediately prior to the seminar.

Seminar 4/15/2015 - Shanhui Fan, Stanford University

Apr 15, 2015  ·  12:00 p.m. 1:00 p.m.  ·  Bowen Hall Auditorium

All seminars are held on Wednesdays from 12:00 noon-1:00 p.m. in the Bowen Hall Auditorium Room 222. A light lunch is provided at 11:30 a.m. in the Bowen Hall Atrium immediately prior to the seminar.

Seminar 4/22/2015 - Stephen Fonash, Penn State University

Apr 22, 2015  ·  12:00 p.m. 1:00 p.m.  ·  Bowen Hall Auditorium

All seminars are held on Wednesdays from 12:00 noon-1:00 p.m. in the Bowen Hall Auditorium Room 222. A light lunch is provided at 11:30 a.m. in the Bowen Hall Atrium immediately prior to the seminar.

Seminar 4/29/2015 - Maria Juenger, University of Texas - Austin

Apr 29, 2015  ·  12:00 p.m. 1:00 p.m.  ·  Bowen Hall Auditorium

All seminars are held on Wednesdays from 12:00 noon-1:00 p.m. in the Bowen Hall Auditorium Room 222. A light lunch is provided at 11:30 a.m. in the Bowen Hall Atrium immediately prior to the seminar.