Department Events

Events

  • Nov
    16-30

    Weekly ChBE Seminar Series (Sossina Haile)

    McCormick-Chemical and Biological Engineering

    9:00 AM M345, Technological Institute

    EVENT DETAILS

    Title: Extracting Material Properties from Relaxation Experiments

    Abstract: Redox active oxides, with mixed ionic and electronic conductivity (MIEC), are critical components in a wide range of energy technologies, serving as electrodes in fuel cells and batteries, and as reactive substrates in solar-driven thermochemical reactors. Accurate knowledge of the surface reaction rate constant, , is essential for both optimal design of components using existing materials and rational discovery of new materials with enhanced catalytic activity. A variety of relaxation methods have been used extensively to determine . Such approaches rely on the change in some measurable property, most commonly conductivity, upon application of a step change in gas-phase oxygen partial pressure. Under the appropriate experimental conditions, the rate at which the property changes in response to the change in gas-phase oxygen chemical potential provides a direct measure of the material kinetic parameters. Here, we present several considerations relevant to accurate extraction of these parameters, with particular focus on identifying relaxation occurring due to thermodynamic rather than material kinetic reasons. Furthermore, while the electrical conductivity relaxation (ECR) method is one of the most widely employed relaxation techniques because of the ease with which high precision conductivity measurements can be made using samples of almost arbitrary dimensions, ECR is impractical for the evaluation of a material in which the change in conductivity in response to change in oxygen partial pressure is extremely small. For such materials mass relaxation emerges as a viable alternative measurement approach. To this end, we describe a high temperature mass relaxation apparatus based on a gallium phosphate piezocrystal microbalance that enables measurements at temperatures as high 700 °C.

    Sossina M. Haile is the Walter P. Murphy Professor of Materials Science and Engineering at Northwestern University, a position she assumed in 2015 after serving 18 years on the faculty at the California Institute of Technology. She earned her Ph.D. in Materials Science and Engineering from the Massachusetts Institute of Technology in 1992. Haile’s research broadly encompasses solid state ionic materials and electrochemical devices, with particular focus on energy technologies. She has established a new class of fuel cells with record performance for clean and efficient electricity generation, and created new avenues for harnessing sunlight to meet rising energy demands. She has published more than 160 articles and holds 12 patents on these and other topics. Amongst her many awards, in 2008 Haile received an American Competitiveness and Innovation (ACI) Fellowship from the U.S. National Science Foundation in recognition of “her timely and transformative research in the energy field and her dedication to inclusive mentoring, education and outreach across many levels.”

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    TIME Thursday, November 16, 2017 at 9:00 AM - 10:00 AM

    LOCATION M345, Technological Institute    map it

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    CONTACT Elizabeth Rentfro    elizabeth.rentfro@northwestern.edu EMAIL

    CALENDAR McCormick-Chemical and Biological Engineering

  • Aug
    17

    Master's Completion form due for TGS Summer master's candidates

    University Academic Calendar

    All Day

    EVENT DETAILS

    TIME Friday, August 17, 2018

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    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar

  • Aug
    18

    Eight-week session ends

    University Academic Calendar

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    EVENT DETAILS

    TIME Saturday, August 18, 2018

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    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar

  • Sep
    1

    Ten-week session ends

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    EVENT DETAILS

    TIME Saturday, September 1, 2018

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    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar

  • Sep
    5

    BTP Biosensor Practicum

    McCormick-Chemical and Biological Engineering

    9:00 AM Pancoe Abbott Auditorium, Pancoe-NSUHS Life Sciences Pavilion

    EVENT DETAILS

    TIME Wednesday, September 5, 2018 at 9:00 AM - 2:30 PM

    LOCATION Pancoe Abbott Auditorium, Pancoe-NSUHS Life Sciences Pavilion    map it

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    CONTACT Emily Kocevar    e-kocevar@northwestern.edu EMAIL

    CALENDAR McCormick-Chemical and Biological Engineering

  • Sep
    7

    Summer Degrees Conferred

    University Academic Calendar

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    EVENT DETAILS

    TIME Friday, September 7, 2018

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    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar

  • Sep
    17

    TGS Graduate Student Orientation

    University Academic Calendar

    All Day

    EVENT DETAILS

    TIME Monday, September 17, 2018

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    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar

  • Sep
    21

    New Student Orientation (Wildcat Welcome)

    University Academic Calendar

    All Day

    EVENT DETAILS

    TIME Friday, September 21, 2018

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    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar

  • Sep
    24

    New Graduate Student Fall Registration begins 9 a.m.

    University Academic Calendar

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    EVENT DETAILS

    TIME Monday, September 24, 2018

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    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar

  • Sep
    25

    New Undergraduate Student Fall Registration

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    EVENT DETAILS

    TIME Tuesday, September 25, 2018

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    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar

  • Sep
    27

    Fall classes begin 8 a.m.

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    EVENT DETAILS

    TIME Thursday, September 27, 2018

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    CONTACT Office of the Registrar    nu-registrar@northwestern.edu EMAIL

    CALENDAR University Academic Calendar

  • Sep
    27-6

    ChBE Seminar Series: Mark Styczinski

    McCormick-Chemical and Biological Engineering

    9:00 AM L211, Technological Institute

    EVENT DETAILS

    TIME Thursday, September 27, 2018 at 9:00 AM - 10:00 AM

    LOCATION L211, Technological Institute    map it

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    CONTACT Elizabeth Rentfro    elizabeth.rentfro@northwestern.edu EMAIL

    CALENDAR McCormick-Chemical and Biological Engineering

  • Oct
    4-6

    ChBE Seminar Series: Charles Sing

    McCormick-Chemical and Biological Engineering

    9:00 AM L211, Technological Institute

    EVENT DETAILS

    TIME Thursday, October 4, 2018 at 9:00 AM - 10:00 AM

    LOCATION L211, Technological Institute    map it

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    CONTACT Elizabeth Rentfro    elizabeth.rentfro@northwestern.edu EMAIL

    CALENDAR McCormick-Chemical and Biological Engineering

  • Oct
    11-6

    ChBE Seminar Series: Mahdi Abu-Omar

    McCormick-Chemical and Biological Engineering

    9:00 AM L211, Technological Institute

    EVENT DETAILS

    TIME Thursday, October 11, 2018 at 9:00 AM - 10:00 AM

    LOCATION L211, Technological Institute    map it

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    CONTACT Elizabeth Rentfro    elizabeth.rentfro@northwestern.edu EMAIL

    CALENDAR McCormick-Chemical and Biological Engineering