Wed, 09 Jul 2008 13:38:49 BST CiteULike: dchens Chen http://www.citeulike.org/user/dchen/author/Chen CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dchen/article/2719221 <i>Applied Physics Letters, Vol. 73, No. 25. (1998), pp. 3665-3667.</i><br /><br />View This Record in Scopus Newtonian to non-Newtonian master flow curves of a bulk glass alloy Pd[sub 40]Ni[sub 10]Cu[sub 30]P[sub 20] Hidemi Kato Yoshihito Kawamura Akihisa Inoue HS Chen Applied Physics Letters, Vol. 73, No. 25. (1998), pp. 3665-3667. 2008-04-25T18:35:55-00:00 1998 Applied Physics Letters 73 25 3665 3667 AIP alloy elasticity shear 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/2670772 <i>Nature, Vol. 367, No. 6463. (10 February 1994), pp. 541-543.</i> Deformation-induced nanocrystal formation in shear bands of amorphous alloys H Chen Y He GJ Shiflet SJ Poon doi:10.1038/367541a0 Nature, Vol. 367, No. 6463. (10 February 1994), pp. 541-543. 2008-04-14T22:43:53-00:00 1994 Nature 367 6463 541 543 application shear shearband http://www.citeulike.org/user/dchen/article/2553163 <i>Physical Review Letters, Vol. 98, No. 16. (2007)</i><br /><br />A molecular level theory for the physical aging of polymer glasses is proposed. The nonequilibrium time evolution of the amplitude of long wavelength density fluctuations, and its influence on activated barrier hopping, plays an essential role. The theory predicts temperature-dependent apparent power-law aging of the segmental relaxation time and logarithmic aging of thermodynamiclike properties, in good accord with experiments. A physical origin for the quantitative nonuniversal aspects based on the amplitude of quenched density fluctuations is suggested. Molecular Theory of Physical Aging in Polymer Glasses Kang Chen Kenneth Schweizer doi:10.1103/PhysRevLett.98.167802 Physical Review Letters, Vol. 98, No. 16. (2007) 2008-03-18T23:12:48-00:00 2007 Physical Review Letters 98 16 APS 2007 glass people polymer theory http://www.citeulike.org/user/dchen/article/2552968 <i>Physical Review Letters, Vol. 99, No. 6. (2007)</i><br /><br />Comprehensive three-dimensional dissipative particle dynamics simulations are carried out to elucidate the diffusion mechanism of a strongly adsorbed polymer chain on a solid surface in dilute solutions. We find Rouse and reptation dynamics for polymer chain diffusing on smooth and rough surfaces (with obstacles or sticking points), respectively. Combining with scaling analysis, we find that the interactions between the surface and the fluid screen the hydrodynamic interaction. The different scaling as found for a polymer chain diffusing on a fluid membrane [Phys. Rev. Lett. 82, 1911 (1999)] and on a solid surface [Nature (London) 406, 146 (2000)] may be explained by the solid surface inhomogeneity that induces reptation. Surface Diffusion Dynamics of a Single Polymer Chain in Dilute Solution Hu Qian Li Chen Zhong Lu Ze Li doi:10.1103/PhysRevLett.99.068301 Physical Review Letters, Vol. 99, No. 6. (2007) 2008-03-18T21:08:38-00:00 2007 Physical Review Letters 99 6 APS 2007 diffusion people polymer surface http://www.citeulike.org/user/dchen/article/767548 <i>Nature, Vol. 442, No. 7100. (19 July 2006), pp. 257-257.</i> Granular materialsPacking grains by thermal cycling K Chen J Cole C Conger J Draskovic M Lohr K Klein T Scheidemantel P Schiffer doi:10.1038/442257a Nature, Vol. 442, No. 7100. (19 July 2006), pp. 257-257. 2006-07-20T21:49:03-00:00 2006 Nature 0028-0836 442 7100 257 257 Nature Publishing Group grain temperature