Anisotropically surface-modified particles, so-called patchy particles, have been recognized as important building blocks in the directed assembly of particles into desired target structures. Various methods employing shadow evaporation and templating have been used to create spherical particles with anchor patches of controllable size and position. More recently, the focus has shifted towards the application of Janus and patchy particles in rheological studies, as emulsion stabilizers, and for colloidal crystal formation.In our work, we have shown that Janus and patchy particles are pre-programmable through patch geometry, size, and number as well as patch material. Most recently, we have (i) used their field-dependent properties to employ them as microviscometers and magnetometric probes, (ii) studied the impact of their amphiphillic character on their interaction with an interface between two immiscible fluids using molecular dynamics simulation, and (iii) explored the fabrication of particles with non-spherical patches to enable the rational design of colloidal crystals.   In this talk, we will report briefly on the preparation of patchy particles via templated and template-free glancing angle vapor deposition (GLAD) developed in our group. Further, we will correlate patch geometry, material, and position with field-directed assembly behavior and discuss its use in potential applications.

Applications of Janus and patchy particles

246th National Meeting (2013)

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