We encapsulate surface modified colloidal polystyrene particles (1 �m) within a pH sensitive capsule membrane using microfluidic technique. The capsule membrane consists of a combination of a pH sensitive polymer and a crosslinked acrylic network. We use different ratio of pH sensitive polymer in the main matrix. Upon exposing pH sensitive capsules to pH gradient, the pH sensitive segments embedded within the main matrix are selectively removed and pores are formed at the membrane surface, subsequently the release of the polystyrene particles can be triggered upon pore formation. In addition, different ratio of pH sensitive polymer in main matrix results in stark contrast between the membrane structure. We observe a close pack arrangement of colloidal acrylate polymer within a pH sensitive polymer matrix at high ratios, while decreasing the ratio results in isolated pH sensitive segments within the main membrane.

Encapsulation of polystyrene colloidal particles within a pH sensitive capsule membrane using microfluidic technique

245th National Meeting (2013)

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