Physical Pharmacy: Association Colloids in Colloidal Dispersions

Having two distinct regions of opposing solution affinities within the same molecule or ion.

Aggregation occurs over a narrow concentration range.

Micelles

<p>Because their diameter is of the order of 50 Å.</p> Signup and view all the answers

<p>Association colloids</p> Signup and view all the answers

<p>Large organic molecules that are solvated and lie within the colloidal size range</p> Signup and view all the answers

<p>They can be salted out due to desolvation of lyophilic molecules</p> Signup and view all the answers

<p>Lyophilic dispersions have strong interaction (solvation) whereas lyophobic dispersions have little or no interaction</p> Signup and view all the answers

<p>Because they do not disperse spontaneously</p> Signup and view all the answers

<p>They can destabilize the dispersion due to neutralization of the charge on the particles</p> Signup and view all the answers

<p>They are usually inorganic, unsolvated, and symmetric</p> Signup and view all the answers

<p>They exert a protective effect due to the formation of colloidal aggregates that are spontaneously formed when the concentration of amphiphile exceeds the critical micelle concentration.</p> Signup and view all the answers

<p>It is the concentration of amphiphile above which micelles are formed spontaneously, and below which the amphiphile molecules exist as individual units.</p> Signup and view all the answers

<p>The addition of electrolytes reduces the critical micelle concentration, making it easier to form micelles.</p> Signup and view all the answers

<p>The viscosity of the system increases as the concentration of the amphiphile increases, due to the formation of more and larger micelles.</p> Signup and view all the answers

<p>Salting out</p> Signup and view all the answers