Abstract
The major factor responsible for the very low colloid stability (W) of dioctadecyldimethylammonium (DODA) chloride, bromide, or acetate vesicles in the presence of monovalent salt is identified. Large DODAAc vesicles prepared in 0.6 M d-glucose remain stable over the entire range of NaAc concentrations tested (0−150 mM NaAc). The pH measured for this highly concentrated d-glucose solution is 5.1−5.3. Because acetic acid is a neutral and small molecule that can freely permeate the DODAAc vesicle, upon addition of an acidic NaAc plus d-glucose solution to the vesicle outside, acetic acid forms and reaches the vesicle interior acting as an acetate carrier; acetate binds to the inner vesicle surface and eliminates any charge asymmetry between the inner and outer surface. Counterions such as chloride or bromide do not cross the membrane to reach the inside. Thereby asymmetry of the charge distribution generated upon external addition of NaCl or NaBr, respectively, to DODACl or DODABr vesicles cannot be relaxed...
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