Synthesis of Nonspherical Colloidal Particles with Anisotropic Properties

@article{citeulike:2709589, abstract = {Abstract: We describe a promising and flexible technique for fabricating uniform nonspherical particles with anisotropic phase and surface properties. Our approach is based on the seeded polymerization technique in which monomer-swollen particles are polymerized. The polymerization causes a phase separation to occur, giving rise to two-phase nonspherical particles. We show that the elastic contraction of the swollen polymer particles induced by elevated polymerization temperatures plays an important role in the phase separation. Moreover, chemical anisotropy of nonspherical particles can be obtained by using immiscible polymer pairs and by employing surface treatments. Furthermore, we are able to produce amphiphilic dumbbell particles consisting of two different bulbs: hydrophilic poly (ethylene imine)-coated polystyrene and hydrophobic polystyrene. Controlled geometries of these amphiphilic nonspherical particles will allow a wide range of potential applications, such as engineered colloid surfactants.}, address = {Contribution from the Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, Amore-Pacific Co. R\&D Center, 314-1, Bora-dong, Giheung-gu, Yongin-si, Gyeonggi-Do, 446-729, Korea, and Department of Physics, Harvard University, Cambridge, Massachusetts 02138}, author = {Kim, J. W. and Larsen, R. J. and Weitz, D. A. }, citeulike-article-id = {2709589}, doi = {10.1021/ja065032m}, journal = {J. Am. Chem. Soc.}, keywords = {2006, colloids, weitz}, month = {November}, number = {44}, pages = {14374--14377}, posted-at = {2008-04-23 18:30:47}, priority = {2}, title = {Synthesis of Nonspherical Colloidal Particles with Anisotropic Properties}, url = {http://dx.doi.org/10.1021/ja065032m}, volume = {128}, year = {2006} }

TY - JOUR ID - citeulike:2709589 L3 - citeulike-article-id:2709589 TI - Synthesis of Nonspherical Colloidal Particles with Anisotropic Properties JF - J. Am. Chem. Soc. VL - 128 IS - 44 SP - 14374 EP - 14377 AD - Contribution from the Division of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, Amore-Pacific Co. R&D Center, 314-1, Bora-dong, Giheung-gu, Yongin-si, Gyeonggi-Do, 446-729, Korea, and Department of Physics, Harvard University, Cambridge, Massachusetts 02138 N2 - Abstract: We describe a promising and flexible technique for fabricating uniform nonspherical particles with anisotropic phase and surface properties. Our approach is based on the seeded polymerization technique in which monomer-swollen particles are polymerized. The polymerization causes a phase separation to occur, giving rise to two-phase nonspherical particles. We show that the elastic contraction of the swollen polymer particles induced by elevated polymerization temperatures plays an important role in the phase separation. Moreover, chemical anisotropy of nonspherical particles can be obtained by using immiscible polymer pairs and by employing surface treatments. Furthermore, we are able to produce amphiphilic dumbbell particles consisting of two different bulbs: hydrophilic poly (ethylene imine)-coated polystyrene and hydrophobic polystyrene. Controlled geometries of these amphiphilic nonspherical particles will allow a wide range of potential applications, such as engineered colloid surfactants. KW - 2006 KW - colloids KW - weitz AU - Kim, JW AU - Larsen, RJ AU - Weitz, DA PY - 2006/11/08/ UR - http://dx.doi.org/10.1021/ja065032m ER -