Calcium Ion-Induced Structural Changes in Carboxymethylcellulose Solutions and Their Effects on Adsorption on Cellulose Surfaces
Journal article, 2022

The adsorption of carboxymethylcellulose (CMC) on cellulose surfaces is one of the most studied examples of the adsorption of an anionic polyelectrolyte on a like-charged surface. It has been suggested that divalent ions can act as a bridge between CMC chains and the surface of cellulose and enhance the CMC adsorption: they can, however, also alter the structure of CMCs in the solution. In previous investigations, the influence of cations on solution properties has been largely overlooked. This study investigates the effect of Ca2+ ions on the properties of CMC solutions as well as the influence on cellulose nanofibers (CNFs), which was studied by dynamic light scattering and correlated with the adsorption of CMC on a cellulose surface probed using QCMD. The presence of Ca2+ facilitated the multichain association of CMC chains and increased the hydrodynamic diameter. This suggests that the adsorption of CMCs at high concentrations of CaCl2 is governed mainly by changes in solution properties rather than by changes in the cellulose surface. Furthermore, an entropy-driven mechanism has been suggested for the adsorption of CMC on cellulose. By comparing the adsorption of CMC from H2O and D2O, it was found that the release of water from the cellulose surface is driving the adsorption of CMC.

Author

Vishnu Arumughan

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Anette Larsson Group

Tiina Nypelö

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Tiina Nypelö Group

Merima Hasani

Chalmers, Chemistry and Chemical Engineering, Chemical Technology, Forest Products and Chemical Engineering

Anette Larsson

Chalmers, Chemistry and Chemical Engineering, Applied Chemistry, Anette Larsson Group

Biomacromolecules

1525-7797 (ISSN) 1526-4602 (eISSN)

Vol. 23 1 47-56

Subject Categories

Physical Chemistry

Paper, Pulp and Fiber Technology

Other Chemistry Topics

DOI

10.1021/acs.biomac.1c00895

PubMed

34936336

More information

Latest update

2/4/2022 3