caa a22 4500 47576482X CHVBK 20180406123602.0 cr unu---uuuuu 170329e20000501xx s 000 0 eng 10.1007/s003960050540 doi (NATIONALLICENCE)springer-10.1007/s003960050540 Young D. A. B. 23 Hillcrest Downham Market PE38 9ND, UK, GB aut Justification for the colloid explanation of Liesegang ring formation [Elektronische Daten] [D. A. B. Young]  The persuasive evidence for the role of colloid in the formation of Liesegang rings is nullified by the low diffusion constants (less than 2 × 10−11 m2 s−1) of sol particles; however, those values were obtained for sols suspended in otherwise homogeneous solutions. The essential randomness of Brownian motion in such situations is absent in Liesegang experiments, where the large excess of outer electrolyte diffusing into the gel creates a bias in molecular bombardment resulting in sol particles moving a given distance in fewer steps, hence in a shorter time. From Einstein's equation (D=x 2/2t) values for D of 2-4 × 10−10 m2 s−1 have been calculated for Liesegang experiments in the literature. It is suggested that such values could well pertain to sol particles diffusing in the heterogeneous conditions existing in those experiments. Springer-Verlag Berlin Heidelberg, 2000 Key words Liesegang rings nationallicence Diffusion of colloid nationallicence Colloid diffusion nationallicence Brownian motion nationallicence Periodic precipitation nationallicence https://doi.org/10.1007/s003960050540 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s003960050540 text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Young D. A. B. 23 Hillcrest Downham Market PE38 9ND, UK, GB aut Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer