Mechanism of structural networking in hydrogels based on silicon and titanium glycerolates / Khonina Tat'yana G.,Safronov Alexander P.,Shadrina Elena V.,Ivanenko Maria V.,Suvorova Anna I.,Chupakhin Oleg N. // JOURNAL OF COLLOID AND INTERFACE SCIENCE. - 2012. - V. 365, l. 1. - P. 81-89.

ISSN/EISSN:

0021-9797 / 1095-7103

Type:

Article

Abstract:

Formation of organic/inorganic hydrogels based on silicon- and titanium-glycerol precursors synthesized by transesterification of alkoxy derivatives in excess of glycerol was investigated. The precursors in excess of glycerol and obtained gels were studied by chemical and physical methods including gelation kinetics, IR spectroscopy, XRD, dynamic and electrophoretic light scattering, mechanical deformation, which disclosed the basic difference in the gelation mechanism and structure of network in the hydrogels. Due to this difference, the gelation time of silicon- and titanium-glycerol precursors depended on pH or electrolyte addition in an opposite way. In the wide pH range, silicon-glycerol hydrogel was a polymeric single-phase system formed by the polymeric network homogeneously swollen in liquid water/glycerol medium. Flory-Rehner theory applied to the elastic modulus of these gels gave 40-180 monomer base units in the subchains of the network depending on water content in the gel. The mechanism of networking was three-dimensional polycondensation promoted by the electrically charged functional groups attached to the flexible polymeric chains. Electrolyte solutions provided the gelation according to Hofmeister series. Titanium-glycerol hydrogels were heterogeneous colloid systems at pH > 1.5 and single-phase polymeric gels at lower pH. Electrolyte solutions provided the gelation according to Schultze-Hardy rule. (C) 2011 Elsevier Inc. All rights reserved.

Author keywords:

Sol-gel; Silicon-glycerol precursor; Titanium-glycerol precursor; Silicon tetraglycerolate; Titanium tetraglycerolate; Hydrogel; Colloidal gelation; Polymeric gelation; Network structure MODIFIED SILANES; MONOLITHS; STABILIZATION; PRECURSORS; CHEMISTRY; PROTEIN

DOI:

10.1016/j.jcis.2011.09.018

Web of Science ID:

ISI:000296401300010

Соавторы в МНС:

Другие поля

Поле	Значение
Month	JAN 1
Publisher	ACADEMIC PRESS INC ELSEVIER SCIENCE
Address	525 B ST, STE 1900, SAN DIEGO, CA 92101-4495 USA
Language	English
EISSN	1095-7103
Keywords-Plus	MODIFIED SILANES; MONOLITHS; STABILIZATION; PRECURSORS; CHEMISTRY; PROTEIN
Research-Areas	Chemistry
Web-of-Science-Categories	Chemistry, Physical
Author-Email	khonina@ios.uran.ru
Funding-Acknowledgement	Russian Foundation for Basic Research {[}10-03-96072-r\_ural\_a]; Urals Branch of the Russian Academy of Sciences {[}09-P-3-2001]
Funding-Text	This work was supported by the Russian Foundation for Basic Research (Project No. 10-03-96072-r\_ural\_a) and the Urals Branch of the Russian Academy of Sciences (Project No. 09-P-3-2001).
Number-of-Cited-References	43
Usage-Count-Last-180-days	2
Usage-Count-Since-2013	16
Journal-ISO	J. Colloid Interface Sci.
Doc-Delivery-Number	839WX