Particles with tunable porosity and morphology by controlling interfacial instability in block copolymer emulsions

A series of porous block copolymer (BCP)
particles with controllable morphology and pore sizes was
fabricated by tuning the interfacial behavior of BCP droplets
in oil-in-water emulsions. A synergistic adsorption of
polystyrene-b-poly(4-vinylpyridine) (PS-b-P4VP) BCPs
and sodium dodecyl sulfate (SDS) to the surface of the
emulsion droplet induced a dramatic decrease in the
interfacial tension and generated interfacial instability at
the particle surface. In particular, the SDS concentration
and the P4VP volume fraction of PS-b-P4VP were key
parameters in determining the degree of interfacial
instability, leading to different types of particles including micelles, capsules, closed-porosity particles, and open-porosity particles with tunable pore sizes ranging from 10 to 500 nm. The particles with open-porosity could be used as pH- responsive, high capacity delivery systems where the uptake and release of multiple dyes could be achieved.

 

Ku, K. H., Shin, J., Klinger, D., Jang, S. G., Hayward, R. C., Hawker, C. J. and Kim, B. J.
ACS Nano
Volume: 10
Number: 5
Pages: 5243−5251
Date: May, 2016
ICB Affiliated Authors: Craig J Hawker