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It is interesting that in certain cases high pressure only produces blocking of the pores ; this happens when the particles are strongly adsorbed by the walls of the capillaries or when the particles are solid. If they 4 are liquid or soft as it is in the case of emulsions or lecithin sols, particles even larger than the pore size can thus be forced through the filter. Some particles which usually are retained by an ultrafilter can be made to pass by the addition of certain stabilising agents which counteract the adsorption.

HOLMES ; Laboratory 3rd2 aed. 1934. Manual of Colloid Chemistry (Wiley, New York 1928), ( ) R. E . STAUFFER, in WEISSBERGER'S Technique of Organic Part I (Interscience, New York 1956) p. 65 if. Chemistry, vol. Ill, F L O C C U L A T I O N E X P E R I M E N T S 27 standing for five minutes the tubes are compared. N o w there is no change in the first three, but the sols of albumin and gelatin have become quite turbid. The colloids like Ag-sol and ferric hydroxide, which are easily flocculated by electrolytes, are lyophobic or hydrophobic.

Again, we add to 5 ml. of each sol 10 ml. alcohol and mix thoroughly. After ( 2) H . HOLMES ; Laboratory 3rd2 aed. 1934. Manual of Colloid Chemistry (Wiley, New York 1928), ( ) R. E . STAUFFER, in WEISSBERGER'S Technique of Organic Part I (Interscience, New York 1956) p. 65 if. Chemistry, vol. Ill, F L O C C U L A T I O N E X P E R I M E N T S 27 standing for five minutes the tubes are compared. N o w there is no change in the first three, but the sols of albumin and gelatin have become quite turbid.

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