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

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Calcium Ion-Induced Structural Changes in Carboxymethylcellulose Solutions and Their Effects on Adsorption on Cellulose Surfaces
Biomacromolecules ( IF 5.5 ) Pub Date : 2021-12-22 , DOI: 10.1021/acs.biomac.1c00895
Vishnu Arumughan _{1,

2} , Tiina Nypelö _{1,

3} , Merima Hasani _{1,

2,

3} , Anette Larsson _{1,

2,

3,

4}

Affiliation

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 QCM-D. 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.

中文翻译：

钙离子诱导的羧甲基纤维素溶液结构变化及其对纤维素表面吸附的影响

羧甲基纤维素 (CMC) 在纤维素表面的吸附是阴离子聚电解质在类似带电表面上吸附研究最多的例子之一。有人提出，二价离子可以充当 CMC 链和纤维素表面之间的桥梁并增强 CMC 吸附：但是，它们也可以改变溶液中 CMC 的结构。在以前的研究中，阳离子对溶液性质的影响在很大程度上被忽视了。本研究调查了 Ca ²⁺离子对 CMC 溶液性质的影响以及对纤维素纳米纤维 (CNF) 的影响，这是通过动态光散射研究的，并与使用 QCM-探测的纤维素表面上 CMC 的吸附相关。 D. Ca ^2+的存在促进了 CMC 链的多链结合并增加了流体动力学直径。这表明在高浓度 CaCl ₂下 CMC 的吸附主要受溶液性质的变化而非纤维素表面的变化控制。此外，已经提出了熵驱动机制用于 CMC 在纤维素上的吸附。通过比较 H ₂ O 和 D ₂ O 对 CMC 的吸附，发现纤维素表面释放的水推动了 CMC 的吸附。

更新日期：2022-01-10

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