Stimulus-responsive colloidal sensors with fast holographic readout

Chen Wang, Henrique W. Moyses, David G. Grier

    Research output: Contribution to journalArticlepeer-review


    Colloidal spheres synthesized from polymer gels swell by absorbing molecules from solution. The resulting change in size can be monitored with nanometer precision using holographic video microscopy. When the absorbate is chemically similar to the polymer matrix, swelling is driven primarily by the entropy of mixing, and is limited by the surface tension of the swelling sphere and by the elastic energy of the polymer matrix. We demonstrate through a combination of optical micromanipulation and holographic particle characterization that the degree of swelling of a single polymer bead can be used to measure the monomer concentration in situ with spatial resolution comparable to the size of the sphere.

    Original languageEnglish (US)
    Article number051903
    JournalApplied Physics Letters
    Issue number5
    StatePublished - Aug 3 2015

    ASJC Scopus subject areas

    • Physics and Astronomy (miscellaneous)


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