<br>用于微流控开关的聚合物/金属离子复合物的可逆交联,ACS Omega

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用于微流控开关的聚合物/金属离子复合物的可逆交联
ACS Omega ( IF 3.7 ) Pub Date : 2021-12-14 , DOI: 10.1021/acsomega.1c04055
Hojun Lee ₁ , Soon-Bo Kang ₁ , Hyunjae Yoo ₁ , Hae-Ryung Lee ₁ , Jeong-Yun Sun _{1,

2}

Affiliation

文献中强烈强调了壳聚糖的重要性，因为这种天然聚合物不仅可以去除水中的重金属离子，而且还具有可回收利用的潜力。然而，作为回收过程重点领域的可逆相变及其动力学尚未得到充分研究。在这里，我们提出了物理交联的壳聚糖水凝胶的溶解和凝胶化的动态研究。具体而言，制备了一维凝胶生长体系和醋酸盐缓冲溶液，用于精确分析影响相变的主导因素。研究发现，溶解速率受 pH 水平、Cu ²⁺和 NO ₂ ^-三个主要因素的调节，而凝胶化速率则很大程度上受 OH ^-浓度的影响。除了凝胶化速率之外，Cu ²⁺的使用还导致凝胶特性的快速实现。这里的结果为过程工程提供了策略，最终确定相变率。此外，基于对壳聚糖水凝胶可逆交联的更好理解，成功操作了微流体开关。需要快速凝胶化来关闭通道，并通过溶解增强策略实现快速切换。结果，发现调节凝胶或溶解速率的因素对于操作流体开关是有用的。

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Reversible Crosslinking of Polymer/Metal-Ion Complexes for a Microfluidic Switch

The importance of chitosan has been strongly emphasized in literature because this natural polymer could not only remove heavy metal ions in water but also have the potential for recyclability. However, reversible phase transition and its dynamics, which are highlighting areas of a recycle process, have not been studied sufficiently. Here, we present dynamic studies of the dissolution as well as the gelation of a physically crosslinked chitosan hydrogel. Specifically, a one-dimensional gel growth system and an acetate buffer solution were prepared for the precise analysis of the dominant factors affecting a phase transition. The dissolution rate was found to be regulated by three major factors of the pH level, Cu²⁺, and NO₂^–, while the gelation rate was strongly governed by the concentration of OH^–. Apart from the gelation rate, the use of Cu²⁺ led to the rapid realization of gel characteristics. The results here provide strategies for process engineering, ultimately to determine the phase-transition rates. In addition, a microfluidic switch was successfully operated based on a better understanding of the reversible crosslinking of the chitosan hydrogel. Rapid gelation was required to close the channel, and a quick switchover was achieved by a dissolution enhancement strategy. As a result, factors that regulated the rates of gelation or dissolution were found to be useful to operate the fluidic switch.

更新日期：2021-12-28

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