Shake-gels: shear-induced gelation of laponite-PEO mixtures

@article{citeulike:2714504, abstract = {Suspensions of clay particles (laponite), mixed with poly(ethylene oxide) (PEO) undergo a dramatic shear thickening when subjected to vigorous shaking, which transforms them from a low viscosity fluid into a [`]shake-gel', a solid with elasticity sufficient enough to support its own weight. The shake-gel is reversible, relaxing back to a fluid with a relaxation time that is strongly dependent on PEO concentration. Shake-gels are observed for PEO concentrations slightly below the threshold for complete saturation of the laponite particles by the polymer. Light scattering measurements confirm that the PEO is adsorbed on the surface of the laponite particles, and suggests that shear induces a bridging between the colloidal particles, resulting in a gel network which spans the system. Desorption of the polymer reduces the bridging and thus relaxes the network.}, author = {Zebrowski, J. and Prasad, V. and Zhang, W. and Walker, L. M. and Weitz, D. A. }, citeulike-article-id = {2714504}, doi = {10.1016/S0927-7757(02)00512-5}, journal = {Colloids and Surfaces A: Physicochemical and Engineering Aspects}, keywords = {gel, shear, weitz}, month = {February}, number = {2-3}, pages = {189--197}, posted-at = {2008-04-25 00:56:32}, priority = {2}, title = {Shake-gels: shear-induced gelation of laponite-PEO mixtures}, url = {http://dx.doi.org/10.1016/S0927-7757(02)00512-5}, volume = {213}, year = {2003} }

TY - JOUR ID - citeulike:2714504 L3 - citeulike-article-id:2714504 TI - Shake-gels: shear-induced gelation of laponite-PEO mixtures JF - Colloids and Surfaces A: Physicochemical and Engineering Aspects VL - 213 IS - 2-3 SP - 189 EP - 197 N2 - Suspensions of clay particles (laponite), mixed with poly(ethylene oxide) (PEO) undergo a dramatic shear thickening when subjected to vigorous shaking, which transforms them from a low viscosity fluid into a [`]shake-gel', a solid with elasticity sufficient enough to support its own weight. The shake-gel is reversible, relaxing back to a fluid with a relaxation time that is strongly dependent on PEO concentration. Shake-gels are observed for PEO concentrations slightly below the threshold for complete saturation of the laponite particles by the polymer. Light scattering measurements confirm that the PEO is adsorbed on the surface of the laponite particles, and suggests that shear induces a bridging between the colloidal particles, resulting in a gel network which spans the system. Desorption of the polymer reduces the bridging and thus relaxes the network. KW - gel KW - shear KW - weitz AU - Zebrowski, J AU - Prasad, V AU - Zhang, W AU - Walker, LM AU - Weitz, DA PY - 2003/02/12/ UR - http://dx.doi.org/10.1016/S0927-7757(02)00512-5 ER -