In this work, the effects of calcium chloride (CaCl₂) concentration on the creep-recovery, linear and nonlinear rheological behavior of nanocellulose gels had been investigated to quantify gel properties. The absolute zeta potential of nanocellulose gels were decreased as the CaCl₂ concentration increased, which was related to the electrostatic repulsion that origin from carboxyl group could be effectively screened with increasing CaCl₂ concentration. Rheological measurements further confirmed this result for nanocellulose gels, which revealed that the increased modulus and viscoelastic properties were obtained in the presence of CaCl₂. The rheological properties of nanocellulose gels were showed to depend on CaCl₂ concentration. The enhanced gel network structure was related to the Ca²⁺ ions that promoted crosslink between nanocellulose by salt bridge. This work highlighted the potential of using electrostatic complexation between nanocellulose and Ca²⁺ ions to form gels, and demonstrated the tunability of the rheological behavior by adjusting the concentration of CaCl₂.

在这项工作中，研究了氯化钙 (CaCl ₂ ) 浓度对纳米纤维素凝胶的蠕变恢复、线性和非线性流变行为的影响，以量化凝胶特性。纳米纤维素凝胶的绝对zeta电位随着CaCl ₂浓度的增加而降低，这与随着CaCl ₂浓度的增加可以有效筛选源自羧基的静电斥力有关。流变学测量进一步证实了纳米纤维素凝胶的这一结果，这表明在 CaCl ₂存在下获得了增加的模量和粘弹性。纳米纤维素凝胶的流变特性取决于 CaCl ₂专注。增强的凝胶网络结构与Ca ²⁺离子通过盐桥促进纳米纤维素之间的交联有关。这项工作强调了使用纳米纤维素和 Ca ²⁺离子之间的静电络合形成凝胶的潜力，并通过调节 CaCl ₂的浓度证明了流变行为的可调性。