8.8.2 Dynamic properties of colloids (2)Diffusion and osmotic pressure 2Dt C E D r RT t D Z2x B 12x L nr L rnr Einstein-Brownian motion equation Xc x(C1-C2) The above equation suggests that if x could be determined using ultramicroscope, the diameter of the colloidal particle can be calculated. The dc=D C mean molar weight of colloidal particle can also dx x determined according to mF A B C D c1 c2 E ½ x ½ x x c c dx dc ( ) 1 − 2  =              = −         = − ( ) 2 1 2 1 2 1 n xc1 xc2 x c1 c2 x c c D dx dc D ( ) 1 − 2  =      ( ) 2 ( ) 1 1 2 1 2 t x c c x c c D = − − − x = 2Dt r t L RT x 3 = Einstein-Brownian motion equation The above equation suggests that if x could be determined using ultramicroscope, the diameter of the colloidal particle can be calculated. The mean molar weight of colloidal particle can also be determined according to: M r L 3 3 4 = L r RT D 6 1 = (2) Diffusion and osmotic pressure 8.8.2 Dynamic properties of colloids