Rotational diffusion constant of microcrystals of Wolfram oxide (WO3) in suspension

@article{citeulike:1747523, abstract = {Rotational Brownian motion of Wolfram oxide (WO3) colloids having rectangular-platelike shapes has been analyzed by means of a direct microscopic observation. By using a video-recording system and a time averaging method on the trace of each colloid in its polydispersed suspension, the rotational diffusion constants have been obtained as a function of its particle size. The rotational diffusion constants thus obtained have been compared with Perrin's expression for rotational diffusion of general ellipsoidal particles, by assuming that a WO3 colloid has approximately an ellipsoidal shape with three different axes. The order of the magnitude of rotational diffusion constant, Dr, about the longest axis, c, has been found to be about 10-3/sec for c around 5 [mu]m. The agreement with the theory has been numerically satisfactory, and the linear dependence of --log Dr on c seen in the theory in this c range has been nearly established in the experiment.}, author = {Suda, Hitoshi and Imai, Nobuhisa }, citeulike-article-id = {1747523}, doi = {http://dx.doi.org/10.1016/0021-9797(85)90024-4}, journal = {Journal of Colloid and Interface Science}, keywords = {diffusion, microcrystals, oxide, rotational, wo3, wolfram}, month = {March}, number = {1}, pages = {204--208}, posted-at = {2007-10-09 23:47:56}, priority = {2}, title = {Rotational diffusion constant of microcrystals of Wolfram oxide (WO3) in suspension}, url = {http://dx.doi.org/10.1016/0021-9797(85)90024-4}, volume = {104}, year = {1985} }

TY - JOUR ID - citeulike:1747523 L3 - citeulike-article-id:1747523 N2 - Rotational Brownian motion of Wolfram oxide (WO3) colloids having rectangular-platelike shapes has been analyzed by means of a direct microscopic observation. By using a video-recording system and a time averaging method on the trace of each colloid in its polydispersed suspension, the rotational diffusion constants have been obtained as a function of its particle size. The rotational diffusion constants thus obtained have been compared with Perrin's expression for rotational diffusion of general ellipsoidal particles, by assuming that a WO3 colloid has approximately an ellipsoidal shape with three different axes. The order of the magnitude of rotational diffusion constant, Dr, about the longest axis, c, has been found to be about 10-3/sec for c around 5 [mu]m. The agreement with the theory has been numerically satisfactory, and the linear dependence of --log Dr on c seen in the theory in this c range has been nearly established in the experiment. IS - 1 JF - Journal of Colloid and Interface Science EP - 208 TI - Rotational diffusion constant of microcrystals of Wolfram oxide (WO3) in suspension VL - 104 SP - 204 KW - diffusion KW - microcrystals KW - oxide KW - rotational KW - wo3 KW - wolfram AU - Suda, Hitoshi AU - Imai, Nobuhisa PY - 1985/03// UR - http://dx.doi.org/10.1016/0021-9797(85)90024-4 ER -