Lyophobic colloids definition

Lyophobic colloids, ordinarily, have an electric charge of definite sign, which can be changed only by special methods. 

Until now, we have been primarily concerned with the definition and measurement of viscosity without regard to the nature of the system under consideration. Next we turn our attention to systems containing dispersed particles with dimensions in the colloidal size range. Viscosity measurements can be used to characterize both lyophobic and lyophilic systems we discuss both in the order cited. 

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