CO2-Switchable Cellulose Nanocrystal Hydrogels,Chemistry of Materials

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CO2-Switchable Cellulose Nanocrystal Hydrogels
Chemistry of Materials ( IF 7.2 ) Pub Date : 2018-01-10 00:00:00 , DOI: 10.1021/acs.chemmater.7b03939
Anna-Lena Oechsle _{1,

2} , Lev Lewis ₁ , Wadood Y. Hamad ₃ , Savvas G. Hatzikiriakos ₄ , Mark J. MacLachlan ₁

Affiliation

A carbon-dioxide-switchable (CO₂-switchable) hydrogel was prepared by adding imidazole to a suspension of cellulose nanocrystals (CNCs). Sparging of CO₂ through the imidazole-containing CNC suspension led to gelation of the CNCs, which was reversible by subsequent sparging with nitrogen (N₂) to form a low-viscosity CNC suspension. The gelation process and the properties of the hydrogels have been investigated by rheology, ζ potential, pH, and conductivity measurements, and the gels were found to have interesting and reversible tunable mechanical properties. The present work describes a straightforward way to obtain switchable CNC hydrogels without the need to functionalize CNCs or add strong acids or bases. These CO₂-responsive CNC hydrogels have potential for application in stimuli-responsive adsorbents, filters, and flocculants.

中文翻译：

CO _2可转换纤维素纳米晶体水凝胶

通过将咪唑添加到纤维素纳米晶体（CNC）的悬浮液中来制备二氧化碳可转换（CO ₂可转换）水凝胶。通过含咪唑的CNC悬浮液喷射CO _2会导致CNC凝胶化，这可通过随后注入氮气（N ₂）形成低粘度的CNC悬浮液来逆转。通过流变学，ζ电势，pH和电导率测量研究了凝胶化过程和水凝胶的性质，发现该凝胶具有有趣且可逆的可调机械性能。本工作描述了无需转换CNC或添加强酸或强碱即可获得可转换CNC水凝胶的直接方法。这些CO ₂响应性的CNC水凝胶具有潜在的刺激性吸附剂，过滤器和絮凝剂的应用。

更新日期：2018-01-10

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