Electrostatic and steric mechanisms of iron oxide nanoparticle sol stabilization by chitosan / Tyukova I. S.,Safronov A. P.,Kotel'nikova A. P.,Agalakova D. Yu. // POLYMER SCIENCE SERIES A. - 2014. - V. 56, l. 4. - P. 498-504.

ISSN/EISSN:

0965-545X / 1555-6107

Type:

Article

Abstract:

With the use of the methods of dynamic and electrophoretic light scattering, the process of stabilization of iron oxide nanoparticle sols by chitosan (M = 12 x 10(4) and 44 x 10(4), degrees of deacetylation of 65 and 70\%) in the pH range 1.8-6.5 at NaCl concentrations up to 1 mol/L has been studied. The disperse phase of the sols was a nanopowder of spherical deaggregated iron oxide nanoparticles 14 nm in weighted-average diameter prepared via laser evaporation. It has been shown that, in an acidic medium, chitosan is capable of efficient stabilization of the iron oxide sol via an electrostatic mechanism providing for an electrokinetic potential of +30 mV. As a result of further deionization of chitosan, the stabilization efficiency increases significantly owing to steric stabilization up to an electrolyte concentration of 1 mol/L. The nanoparticles are encapsulated inside the chitosan macromolecular coils in the course of successive bouts of electrostatic and steric stabilization. A new effect-the spontaneous deaggregation of nanoparticles during sol storage with a characteristic time around 5 days-has been observed.

Author keywords:

FE3O4 NANOPARTICLES; FE3O4-CHITOSAN NANOPARTICLES; LIPASE IMMOBILIZATION

DOI:

10.1134/S0965545X14040178

Web of Science ID:

ISI:000339896900013

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JUL
Publisher	MAIK NAUKA/INTERPERIODICA/SPRINGER
Address	233 SPRING ST, NEW YORK, NY 10013-1578 USA
Language	English
EISSN	1555-6107
Keywords-Plus	FE3O4 NANOPARTICLES; FE3O4-CHITOSAN NANOPARTICLES; LIPASE IMMOBILIZATION
Research-Areas	Polymer Science
Web-of-Science-Categories	Polymer Science
Author-Email	Irina.Tyucova@usu.ru
Funding-Acknowledgement	Project of Basic Research of the Ural Branch, Russian Academy of Sciences; Russian Foundation for Basic Research {[}13-03-96068, 13-08-01050]
Funding-Text	This work was partially supported by the Project of Basic Research of the Ural Branch, Russian Academy of Sciences, and by grants of the Russian Foundation for Basic Research (project nos. 13-03-96068 and 13-08-01050).
Number-of-Cited-References	31
Usage-Count-Last-180-days	1
Usage-Count-Since-2013	7
Journal-ISO	Polym. Sci. Ser. A
Doc-Delivery-Number	AM5KM