Control of colloids with gravity, temperature gradients, and electric fields

Matt Sullivan, Kun Zhao, Christopher Harrison, Robert H. Austin, Mischa Megens, Andrew Hollingsworth, William B. Russel, Zhengdong Cheng, Thomas Mason, P. M. Chaikin

    Research output: Contribution to journalArticle

    Abstract

    We have used a variety of different applied fields to control the density, growth, and structure of colloidal crystals. Gravity exerts a body force proportional to the buoyant mass and in equilibrium produces a height-dependent concentration profile. A similar body force can be obtained with electric fields on charged particles (electrophoresis), a temperature gradient on all particles, or an electric field gradient on uncharged particles (dielectrophoresis). The last is particularly interesting since its magnitude and sign can be changed by tuning the applied frequency. We study these effects in bulk (making 'dielectrophoretic bottles' or traps), to control concentration profiles during nucleation and growth and near surfaces. We also study control of non-spherical and optically anisotropic particles with the light field from laser tweezers.

    Original languageEnglish (US)
    JournalJournal of Physics: Condensed Matter
    Volume15
    Issue number1
    DOIs
    StatePublished - Jan 15 2003

    Fingerprint

    Colloids
    Thermal gradients
    colloids
    temperature gradients
    Gravitation
    Electric fields
    gravitation
    Electrophoresis
    electric fields
    bottles
    Bottles
    Charged particles
    electrophoresis
    profiles
    charged particles
    Nucleation
    Tuning
    tuning
    traps
    nucleation

    ASJC Scopus subject areas

    • Electronic, Optical and Magnetic Materials
    • Condensed Matter Physics

    Cite this

    Sullivan, M., Zhao, K., Harrison, C., Austin, R. H., Megens, M., Hollingsworth, A., ... Chaikin, P. M. (2003). Control of colloids with gravity, temperature gradients, and electric fields. Journal of Physics: Condensed Matter, 15(1). https://doi.org/10.1088/0953-8984/15/1/302

    Control of colloids with gravity, temperature gradients, and electric fields. / Sullivan, Matt; Zhao, Kun; Harrison, Christopher; Austin, Robert H.; Megens, Mischa; Hollingsworth, Andrew; Russel, William B.; Cheng, Zhengdong; Mason, Thomas; Chaikin, P. M.

    In: Journal of Physics: Condensed Matter, Vol. 15, No. 1, 15.01.2003.

    Research output: Contribution to journalArticle

    Sullivan, M, Zhao, K, Harrison, C, Austin, RH, Megens, M, Hollingsworth, A, Russel, WB, Cheng, Z, Mason, T & Chaikin, PM 2003, 'Control of colloids with gravity, temperature gradients, and electric fields', Journal of Physics: Condensed Matter, vol. 15, no. 1. https://doi.org/10.1088/0953-8984/15/1/302
    Sullivan, Matt ; Zhao, Kun ; Harrison, Christopher ; Austin, Robert H. ; Megens, Mischa ; Hollingsworth, Andrew ; Russel, William B. ; Cheng, Zhengdong ; Mason, Thomas ; Chaikin, P. M. / Control of colloids with gravity, temperature gradients, and electric fields. In: Journal of Physics: Condensed Matter. 2003 ; Vol. 15, No. 1.
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    AU - Russel, William B.

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