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  • Title: Controlled flats on spherical polymer colloids.
    Author: Ramírez LM, Milner ST, Snyder CE, Colby RH, Velegol D.
    Journal: Langmuir; 2010 May 18; 26(10):7644-9. PubMed ID: 20041681.
    Abstract:
    Colloidal particles with heterogeneous surfaces offer rich possibilities for controlled self-assembly. We have developed a method for preparing micrometer-sized polystyrene spheres with circular flat spots of controlled radius and location. The flats are created by settling the particles onto a flat glass substrate and then raising the temperature above the glass-transition temperature of the polymer for a controlled time (t). The polymer particle spreads on the glass such that the radius of the flat grows with time. We present a scaling theory for the hydrodynamics of the flattening process, finding that the radius of the flat grows as t(1/3). The model is in good agreement with our experimental observations of the flat radius versus spreading time as well as with previous studies in the literature for sintering polymer spheres.
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