Sat, 26 Jul 2008 06:27:49 BST CiteULike: dchen's Marquez http://www.citeulike.org/user/dchen/author/Marquez CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dchen/article/1210848 <i>Science, Vol. 298, No. 5595. (1 November 2002), pp. 1006-1009.</i><br /><br />10.1126/science.1074868 Colloidosomes: Selectively Permeable Capsules Composed of Colloidal Particles AD Dinsmore Ming Hsu MG Nikolaides Manuel Marquez AR Bausch DA Weitz doi:10.1126/science.1074868 Science, Vol. 298, No. 5595. (1 November 2002), pp. 1006-1009. 2007-04-05T12:51:02-00:00 2002 Science 298 5595 1006 1009 colloidosome dinsmore emulsion science http://www.citeulike.org/user/dchen/article/2710303 <i>J. Am. Chem. Soc., Vol. 126, No. 43. (3 November 2004), pp. 14117-14122.</i><br /><br />Abstract: We fabricate and characterize capsules that are composite membranes, made of a polymer network stabilized by adsorption to colloids and inflated by osmotic pressure from internal free polyelectrolyte; here, poly-L-lysine forms the network and inflates the capsules. To assess these capsules' properties and structure, we deform capsules using microcantilevers and use finite element modeling to describe these deformations. Additional experimental tests confirm the model's validity. These capsules' resilient response to mechanical forces indicates that loading and shear should be good triggers for the release of contents via deformation. The osmotic pressure inflating these capsules has the potential to trigger release of contents via deflation in response to changes in the capsules' environment; we demonstrate addition of salt as a trigger for deflating capsules. Because these capsules have a variety of release triggers available and the technique used to fabricate them is very flexible and allows high encapsulation efficiency, these capsules have very high potential for application in many areas. Self-Assembled Polymer Membrane Capsules Inflated by Osmotic Pressure VD Gordon X Chen JW Hutchinson AR Bausch M Marquez DA Weitz doi:10.1021/ja0474749 J. Am. Chem. Soc., Vol. 126, No. 43. (3 November 2004), pp. 14117-14122. 2008-04-23T21:53:12-00:00 2004 J. Am. Chem. Soc. 126 43 14117 14122 emulsion technique weitz http://www.citeulike.org/user/dchen/article/2710276 <i>Langmuir, Vol. 21, No. 7. (29 March 2005), pp. 2963-2970.</i><br /><br />Abstract: We construct shells with tunable morphology and mechanical response with colloidal particles that self-assemble at the interface of emulsion droplets. Particles self-assemble to minimize the total interfacial energy, spontaneously forming a particle layer that encapsulates the droplets. We stabilize these layers to form solid shells at the droplet interface by aggregating the particles, connecting the particles with adsorbed polymer, or fusing the particles. These techniques reproducibly yield shells with controllable properties such as elastic moduli and breaking forces. To enable diffusive exchange through the particle shells, we transfer them into solvents that are miscible with the encapsulant. We characterize the mechanical properties of the shells by measuring the response to deformation by calibrated microcantilevers. Self-assembled Shells Composed of Colloidal Particles: Fabrication and Characterization MF Hsu MG Nikolaides AD Dinsmore AR Bausch VD Gordon X Chen JW Hutchinson DA Weitz M Marquez doi:10.1021/la0472394 Langmuir, Vol. 21, No. 7. (29 March 2005), pp. 2963-2970. 2008-04-23T21:31:14-00:00 2005 Langmuir 21 7 2963 2970 colloids dinsmore emulsion technique weitz http://www.citeulike.org/user/dchen/article/2709655 <i>Applied Physics Letters, Vol. 88, No. 26. (2006)</i><br /><br />View This Record in Scopus Electrocoalescence of drops synchronized by size-dependent flow in microfluidic channels Keunho Ahn Jeremy Agresti Henry Chong Manuel Marquez DA Weitz Applied Physics Letters, Vol. 88, No. 26. (2006) 2008-04-23T17:54:25-00:00 2006 Applied Physics Letters 88 26 AIP emulsion microrheology weitz http://www.citeulike.org/user/dchen/article/2709608 <i>Langmuir, Vol. 22, No. 21. (10 October 2006), pp. 8618-8622.</i><br /><br />Abstract: The microfluidic assembly of colloid-filled hydrogel granules of varying shape and composition is described. First, drops are formed by shearing a concentrated colloidal microsphere-acrylamide suspension in a continuous oil phase using a sheath-flow device. Both homogeneous and Janus (hemispherically distinct) spheres and disks are produced by confining the assembled drops in microchannels of varying geometry. Next, photopolymerization is carried out shortly after drop breakup to preserve their morphology. Representative wet and dried granules are characterized using fluorescence and scanning electron microscopy, respectively. Our approach offers a facile route for assembling colloid-filled hydrogel granules with controlled shape and composition. Microfluidic Assembly of Homogeneous and Janus Colloid-Filled Hydrogel Granules RF Shepherd JC Conrad SK Rhodes DR Link M Marquez DA Weitz JA Lewis doi:10.1021/la060759+ Langmuir, Vol. 22, No. 21. (10 October 2006), pp. 8618-8622. 2008-04-23T17:33:28-00:00 2006 Langmuir 22 21 8618 8622 2006 colloids weitz http://www.citeulike.org/user/dchen/article/2709549 <i>Angewandte Chemie International Edition, Vol. 45, No. 16. (2006), pp. 2556-2560.</i><br /><br />No Abstract Electric Control of Droplets in Microfluidic Devices Darren Link Erwan Grasland-Mongrain Agnes Duri Flavie Sarrazin Zhengdong Cheng Galder Cristobal Manuel Marquez David Weitz doi:10.1002/anie.200503540 Angewandte Chemie International Edition, Vol. 45, No. 16. (2006), pp. 2556-2560. 2008-04-23T17:12:33-00:00 2006 Angewandte Chemie International Edition 45 16 2556 2560 2006 microrheology weitz http://www.citeulike.org/user/dchen/article/2683388 <i>Nano Lett., Vol. 7, No. 9. (12 September 2007), pp. 2876-2880.</i><br /><br />Abstract: We present a robust and straightforward approach for fabricating a novel colloidosome system where colloidal particles are assembled to form colloidal shells on the surface of stimuli-responsive microgel scaffolds. We demonstrate that the structural properties of the colloidal shells can be controlled through the colloidal particle size and modulus, and the state of supporting microgel particles. This technique offers a new way to engineer colloidosomes, enabling fine control over their permeability over a wide range of length scales. Colloidal Assembly Route for Responsive Colloidosomes with Tunable Permeability JW Kim A Fernandez-Nieves N Dan AS Utada M Marquez DA Weitz doi:10.1021/nl0715948 Nano Lett., Vol. 7, No. 9. (12 September 2007), pp. 2876-2880. 2008-04-17T20:10:58-00:00 2007 Nano Lett. 7 9 2876 2880 2007 colloid emulsion weitz http://www.citeulike.org/user/dchen/article/2683315 <i>Applied Physics Letters, Vol. 91, No. 13. (2007)</i><br /><br />View this record in Web of Science Controlled production of emulsion drops using an electric field in a flow-focusing microfluidic device Haejune Kim Dawei Luo Darren Link David Weitz Manuel Marquez Zhengdong Cheng Applied Physics Letters, Vol. 91, No. 13. (2007) 2008-04-17T19:47:51-00:00 2007 Applied Physics Letters 91 13 AIP emulsion flow weitz