Evaporation of aqueous solutions of organic acids through spread films of poly(diallyldimethylammonium chloride)/sodium dodecylsulfate complex

ABSTRACT

The films with the extreme concentration of poly (diallyldimethylammonium chloride)/sodium dodecylsulfate complex spread to the surface of aqueous solutions of formic and acetic acids reduce the evaporation rate of liquids by 3–6% and demonstrate selective properties increasing water content in the vapor by 1–3 abs.%. The concentrations of solutions were up to 30 vol.%. The formation conditions of such films were determined by means of the Wilhelmy plate technique. Surface tension isotherms of aqueous solutions of acids were also obtained.

KEYWORDS:

• Polyelectrolyte/surfactant complexes
• rate of evaporation
• selectivity
• spread films
• surface tension

Funding

This study was financially supported by the St. Petersburg State University (grant number 12.38.257.2014) and the Russian Foundation of Basic Research (RFFI grant number 14-03-00670_a).

Additional information

Funding

This study was financially supported by the St. Petersburg State University (grant number 12.38.257.2014) and the Russian Foundation of Basic Research (RFFI grant number 14-03-00670_a).