Confocal microscopy of colloidal dispersions in shear flow using a counter-rotating cone–plate shear cell

@article{citeulike:1510789, abstract = {We report on novel possibilities for studying colloidal suspensions in a steady shear field in real space. Fluorescence confocal microscopy is combined with the use of a counter-rotating cone-plate shear cell. This allows imaging of individual particles in the bulk of a sheared suspension in a stationary plane. Moreover, this plane of zero velocity can be moved in the velocity gradient direction while keeping the shear rate constant. The colloidal system under study consists of rhodamine labelled PMMA spheres in a nearly density and refractive index matched mixture of cyclohexylbromide and cis-decalin. We show measured flow profiles in both the fluid and the crystalline phase and find indications for shear banding in the case of a sheared crystal. Furthermore, we show that, thanks to the counter-rotating principle of the cone-plate shear cell, a layer of particles in the bulk of a sheared crystalline suspension can be imaged for a prolonged time, with the result that their positions can be tracked.}, author = {Alfons and Imhof, Arnout }, citeulike-article-id = {1510789}, doi = {10.1088/0953-8984/16/38/010}, journal = {Journal of Physics: Condensed Matter}, keywords = {cone\_plate\_rheometer, confocal}, number = {38}, pages = {S3917--S3927}, posted-at = {2007-07-29 02:26:43}, priority = {2}, title = {Confocal microscopy of colloidal dispersions in shear flow using a counter-rotating cone\–plate shear cell}, url = {http://dx.doi.org/10.1088/0953-8984/16/38/010}, volume = {16}, year = {2004} }

TY - JOUR ID - citeulike:1510789 L3 - citeulike-article-id:1510789 TI - Confocal microscopy of colloidal dispersions in shear flow using a counter-rotating cone\–plate shear cell JF - Journal of Physics: Condensed Matter VL - 16 IS - 38 SP - S3917 EP - S3927 N2 - We report on novel possibilities for studying colloidal suspensions in a steady shear field in real space. Fluorescence confocal microscopy is combined with the use of a counter-rotating cone-plate shear cell. This allows imaging of individual particles in the bulk of a sheared suspension in a stationary plane. Moreover, this plane of zero velocity can be moved in the velocity gradient direction while keeping the shear rate constant. The colloidal system under study consists of rhodamine labelled PMMA spheres in a nearly density and refractive index matched mixture of cyclohexylbromide and cis-decalin. We show measured flow profiles in both the fluid and the crystalline phase and find indications for shear banding in the case of a sheared crystal. Furthermore, we show that, thanks to the counter-rotating principle of the cone-plate shear cell, a layer of particles in the bulk of a sheared crystalline suspension can be imaged for a prolonged time, with the result that their positions can be tracked. KW - cone_plate_rheometer KW - confocal AU - Alfons AU - Imhof, Arnout PY - 2004/// UR - http://dx.doi.org/10.1088/0953-8984/16/38/010 ER -