Entropic nature of the adsorption of sodium dodecylbenzenesulfonate on nanoparticles of aluminum and iron oxides in aqueous medium / Mansurov R. R.,Safronov A. P.,Lakiza N. V. // RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A. - 2016. - V. 90, l. 6. - P. 1200-1205.

ISSN/EISSN:

0036-0244 / 1531-863X

Type:

Article

Abstract:

The adsorption of anionic surfactant sodium dodecylbenzenesulfonate (SDBS) from aqueous solution on the hydrophilic surfaces of aluminum oxide and iron oxide nanoparticles is studied via UV spectrophotometry, electrophoretic light scattering, and isothermal microcalorimetry. It is shown that the isotherms of the adsorption of SDBS on the surfaces of both oxides in the area of concentrations up to 0.6 mmol/L is linear. It is found that the positive zeta potential of the surfaces of the particles falls to zero and shifts toward the range of negative values due to adsorption. The adsorption of SDBS is characterized by positive enthalpy values over the investigated range of concentrations, while the loss of energy during adsorption indicates it is of an entropic nature. It is concluded that the probable cause of the increase in entropy is the dehydration of SDBS molecules during on surface adsorption. The obtained results are discussed in terms of the formation of hemimicelles of surfactant on the hydrophilic surfaces of metal oxide nanoparticles in an aqueous medium.

Author keywords:

surfactants; adsorption; metal oxides; hydrophilic surface; nanoparticles; microcalorimetry DISPERSION BEHAVIOR; SUSPENSIONS; STABILITY; DELIVERY

DOI:

10.1134/S0036024416060121

Web of Science ID:

ISI:000376605500016

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JUN
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
EISSN	1531-863X
Keywords-Plus	DISPERSION BEHAVIOR; SUSPENSIONS; STABILITY; DELIVERY
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Physical
Author-Email	renat.mans@gmail.com
Funding-Acknowledgement	Russian Science Foundation {[}14-19-00989]
Funding-Text	This work was supported by the Russian Science Foundation, project no. 14-19-00989.
Number-of-Cited-References	23
Usage-Count-Last-180-days	3
Usage-Count-Since-2013	7
Journal-ISO	Russ. J. Phys. Chem. A
Doc-Delivery-Number	DM8IL