Shear Rupturing of Droplets in Complex Fluids

@article{citeulike:2722873, abstract = {Abstract: We have experimentally studied the shear-induced rupturing of viscous droplets in viscoelastic complex fluids. Remarkably, a premixed emulsion of large, polydisperse droplets can be ruptured into monodisperse emulsions of uniform colloidal droplets. The monodispersity becomes most pronounced when the premixed emulsion is viscoelastic and has a shear-thinning viscosity. Since viscoelastic materials may fracture, we reduce the gap of our shear cell to ensure a spatially uniform strain rate for rupturing. We observe monodispersity whether the viscoelasticity arises from the suspending fluid (e.g., concentrated surfactant solution) or droplet deformation as in compressed emulsions. Our observations suggest that the monodispersity results from droplet rupturing alone and that the capillary instability is inhibited by the partial elasticity of the complex fluid. We use the monodispersity to study how the droplet size depends upon the shear rate and composition.}, address = {Johns Hopkins University, Department of Chemical Engineering, 221 Maryland Hall, 3400 N. Charles Saint, Baltimore, Maryland 21218, and Centre de Recherche Paul Pascal, Ave. A. Schweitzer, F-33600 Pessac, France}, author = {Mason, T. G. and Bibette, J. }, citeulike-article-id = {2722873}, doi = {10.1021/la9700580}, journal = {Langmuir}, keywords = {emulsion, mason, shear}, month = {August}, number = {17}, pages = {4600--4613}, posted-at = {2008-04-27 01:19:50}, priority = {2}, title = {Shear Rupturing of Droplets in Complex Fluids}, url = {http://dx.doi.org/10.1021/la9700580}, volume = {13}, year = {1997} }

TY - JOUR ID - citeulike:2722873 L3 - citeulike-article-id:2722873 TI - Shear Rupturing of Droplets in Complex Fluids JF - Langmuir VL - 13 IS - 17 SP - 4600 EP - 4613 AD - Johns Hopkins University, Department of Chemical Engineering, 221 Maryland Hall, 3400 N. Charles Saint, Baltimore, Maryland 21218, and Centre de Recherche Paul Pascal, Ave. A. Schweitzer, F-33600 Pessac, France N2 - Abstract: We have experimentally studied the shear-induced rupturing of viscous droplets in viscoelastic complex fluids. Remarkably, a premixed emulsion of large, polydisperse droplets can be ruptured into monodisperse emulsions of uniform colloidal droplets. The monodispersity becomes most pronounced when the premixed emulsion is viscoelastic and has a shear-thinning viscosity. Since viscoelastic materials may fracture, we reduce the gap of our shear cell to ensure a spatially uniform strain rate for rupturing. We observe monodispersity whether the viscoelasticity arises from the suspending fluid (e.g., concentrated surfactant solution) or droplet deformation as in compressed emulsions. Our observations suggest that the monodispersity results from droplet rupturing alone and that the capillary instability is inhibited by the partial elasticity of the complex fluid. We use the monodispersity to study how the droplet size depends upon the shear rate and composition. KW - emulsion KW - mason KW - shear AU - Mason, TG AU - Bibette, J PY - 1997/08/20/ UR - http://dx.doi.org/10.1021/la9700580 ER -