Georgetown University LogoGeorgetown University Library LogoDigitalGeorgetown Home
    • Login
    View Item 
    •   DigitalGeorgetown Home
    • Georgetown University Institutional Repository
    • Georgetown College
    • Department of Physics
    • Graduate Theses and Dissertations - Physics
    • View Item
    •   DigitalGeorgetown Home
    • Georgetown University Institutional Repository
    • Georgetown College
    • Department of Physics
    • Graduate Theses and Dissertations - Physics
    • View Item
    JavaScript is disabled for your browser. Some features of this site may not work without it.

    Shear Thickening of Silica Rod Suspensions

    Cover for Shear Thickening of Silica Rod Suspensions
    View/Open
    View/Open: Lai_georgetown_0076D_14778.pdf (2.8MB) Bookview

    Creator
    Lai, Xiangwen
    Advisor
    Urbach, Jeffrey
    Abstract
    Colloidal particles in a liquid such as silica rod suspensions exhibit non-Newtonian behaviors like continuous shear thickening (CST) and discontinuous shear thickening (DST). These rheological behaviors of suspensions of spherical particles have been widely studied and abrupt shear thickening is known to be a result of the increasing interparticle frictional interactions with the increase of particle volume fraction and stress. These behaviors in suspensions of rod-like particles, however, have only recently been investigated due to the complexity of the rod-like particle suspensions under shear. While the role of the interparticle frictional forces has been explored, the contribution of the aspect ratio and size of the particles to shear thickening has mostly remained unknown. Here, we synthesize silica rods with a tunable aspect ratio in water/glycerol solution. We then perform rheological measurements to study the shear thickening behavior on several aspect ratios and sizes of the rod-like particles with various volume fractions. We demonstrate a decrease in the critical volume fraction for DST with increasing aspect ratio. With the Wyart and Cates model (W-C model), we can obtain the frictionless jamming fraction, ϕ_0, and the frictional jamming fraction, ϕ_m. We also investigate the effect of temperature on shear thickening and show that the flow curves of the relative viscosity under temperatures from 0 to 35 0C collapse onto a single curve.
    Description
    Ph.D.
    Permanent Link
    http://hdl.handle.net/10822/1060775
    Date Published
    2020
    Subject
    Complex Fluids; Condensed Matter; Materials Science; Soft Condensed Matter; Physics; Physics;
    Type
    thesis
    Publisher
    Georgetown University
    Extent
    100 leaves
    Collections
    • Graduate Theses and Dissertations - Physics
    Metadata
    Show full item record

    Related items

    Showing items related by title, author, creator and subject.

    • Cover for TRUANCY PREVENTION IN THE DISTRICT OF COLUMBIA: IS IT EFFECTIVE OR IS IT JUST ANOTHER DISCRETIONARY PRACTICE FOR SCHOOLS TO ADMINISTER SUSPENSIONS?

      TRUANCY PREVENTION IN THE DISTRICT OF COLUMBIA: IS IT EFFECTIVE OR IS IT JUST ANOTHER DISCRETIONARY PRACTICE FOR SCHOOLS TO ADMINISTER SUSPENSIONS? 

      Chisti, Adlah (Georgetown University, 2016)
      Truancy prevention in the District of Columbia was an issue taken up after a tragic event among teenagers that resulted in multiple deaths and due to behavior related to truancy. The law was finally enacted in D.C. in 2013. ...
    Related Items in Google Scholar

    Georgetown University Seal
    ©2009 - 2023 Georgetown University Library
    37th & O Streets NW
    Washington DC 20057-1174
    202.687.7385
    digitalscholarship@georgetown.edu
    Accessibility
     

     

    Browse

    All of DigitalGeorgetownCommunities & CollectionsCreatorsTitlesBy Creation DateThis CollectionCreatorsTitlesBy Creation Date

    My Account

    Login

    Statistics

    View Usage Statistics

    Georgetown University Seal
    ©2009 - 2023 Georgetown University Library
    37th & O Streets NW
    Washington DC 20057-1174
    202.687.7385
    digitalscholarship@georgetown.edu
    Accessibility