Influence of carboxymethyl cellulose solutions on rheological properties of Laponite dispersions

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Author(s):	Corzo, Ingri Julieth Mancilla ; da Fonseca, Jessica Heline Lopes ; d'Avila, Marcos Akira Total Authors: 3
Document type:	Journal article
Source:	RHEOLOGICA ACTA; v. 62, n. 7-8, p. 12-pg., 2023-06-15.
Abstract
Rheological analysis is an important tool toinvestigate the structural characteristics of materials widely used in the biomedical field, such as polymer solutions, colloids, and hydrogels. In this work, we studied the rheological properties of a colloidal system composed of carboxymethyl cellulose (CMC) and Laponite, both biocompatible materials. Rheological properties of CMC/Laponite aqueous dispersions are influenced by electrostatic interactions and hydrogen bonds between the silanol (Si-O) groups of Laponite and hydroxyl (-OH) of CMC. It was found that the effect of Laponite rheological behavior is strongly affected by CMC concentration, resulting in weak or strong gels. Adding CMC reinforces the blended network, increasing the storage (G') and loss (G") moduli, as well as viscosity. CMC/Laponite gels presented strong shear-thinning and thixotropy due to structural rearrangements when subjected to shear stresses. Moreover, time sweep tests revealed that adding CMC inhibited Laponite aging. (AU)

FAPESP's process:	17/23776-5 - Rheology and Additive Manufacturing of Nanocomposite Hydrogels for Applications in Regenerative Medicine
Grantee:	Marcos Akira d'Ávila
Support Opportunities:	Regular Research Grants