Influence of carboxymethyl cellulose solutions on rheological properties of Laponite dispersions

Autor(es)

Corzo, Ingri Julieth Mancilla ; da Fonseca, Jessica Heline Lopes ; d'Avila, Marcos Akira

• Tipo de documento: Artigo Científico
• Fonte: RHEOLOGICA ACTA; v. 62, n. 7-8, p. 12-pg., 2023-06-15.

Resumo

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)

• Processo FAPESP: 17/23776-5 - Reologia e Manufatura Aditiva de Hidrogéis Nanocompósitos para Aplicações em Medicina Regenerativa
• Beneficiário: Marcos Akira d'Ávila
• Modalidade de apoio: Auxílio à Pesquisa - Regular