Monitoring Colloidal Growth With Holographic Particle Characterization

Chen Wang, Hagay Shpaisman, Andrew Hollingsworth, David Grier

Research output: Contribution to conferenceAbstractpeer-review


The holographic video microscopy measurements of the size and refractive index of individual colloidal particles in the dispersion are precise enough to track subtle changes in particles' properties and rapid enough for real-time process control. We demonstrate this technique by applying it to the synthesis of monodisperse samples of crosslinked polydimethysiloxane (PDMS) spheres. The measured time dependence of these spheres' most probable radius and distribution width thereof are consistent with a modified LaMer model for colloidal growth. The joint distribution of size and refractive index, however, also reveals a small proportion of undersize, lower-density spheres. Applied over longer time periods, holographic characterization also tracks how the newly-synthesized spheres age, and illuminates the aging mechanism.
Original languageAmerican English
StatePublished - 2015
EventAPS March Meeting 2015 - San Antonio, United States
Duration: 2 Mar 20156 Mar 2015


ConferenceAPS March Meeting 2015
Country/TerritoryUnited States
CitySan Antonio
Internet address


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