92168.pdf
212 Colloid stability sols, especially in relation to added electrolyte, is treated in terms of the energy changes which take pl ...
Colloid stability 213 For the case of two spherical particles of radii a\ and a 2 , Stern potentials, (^0) dl and (^0) d2, and a ...
214 Colloid stability Tabk 8.2 Predicted signs of VR* Situation (a) fai = ^rd; (b) tjfdi and 4 2*0 >d2 of like sign but unequ ...
Colloid stability 215 increasing K (i.e. by increasing electrolyte concentration and/or counter-ion charge number). Specific eff ...
216 Colloid stability With the exception of highly polar materials, London dispersion forces account for nearly all of the van d ...
Colloid stability 217 between the particles, the result of which is a weakening of VA. In most practical situations relating to ...
218 Colloid stability Table 8.3 Values of Hamaker constants^105 Material AH (microscopic) AH (macroscopic) 1(T^20 J 10" Water Io ...
Colloid stability 219 If the two particles are of the same material, this expression becomes m = (8,13) giving values of Ai3l fo ...
220 Colloid stability Distance between particles (H) / VA / / / / / Figure 8.2 Total interaction energy curves, V(l) and V(2), o ...
Colloid stability 221 distances. If this minimum is moderately deep compared with kT, it should give rise to a loose, easily rev ...
222 Colloid stability 6 }QOkT 5QkT -50 kT Figure 8.4 The influence of Stern potential, ifa, on the total potential energy of i ...
Colloid stability 223 Measurement of particle interactions Owing to their fundamental interest and their practical importance in ...
224 Colloid stability measured attractive forces were consistent with those predicted by theory, provided that retardation was a ...
Colloid stability 225 Figure 8.5 Distribution and density of dispersion medium molecules between molecuiarly smooth solid surfac ...
226 Colloid stability coagulation concentration depends upon the criterion which is set for judging whether, or not, the sol is ...
Colloid stability 227 (2e^2 N cz^2 1 Substituting — for K (equation (7.6)) gives v e** J c,c.c.= 9.85 x__ 10VA: ___^5 F^5 y N,e ...
228 Colloid stability 150 100 > E 10-^4 10-3 ID'^2 10-^1 Coagulation concentration/mol dnrr^3 Figure 8.6 Coagulation concentr ...
Colloid stability 229 The rate at which particles aggregate is given by _. _„,dn^2 -—•£••»•* — , &2/I df where n is the numb ...
230 Colloid stability spherical particles, and considering only the aggregation of single particles to form doublets where a is ...
Colloid stability 231 10-^4 10-3 10-2 10-1 Electrolyte concentration/mol dm-3 Figure 8.7 Theoretical dependence of stability rat ...
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