Tiihonen Lassi V, Bernardo Gabriel, Dalgliesh Robert, Mendes Adélio, Parnell Steven R
Faculty of Applied Sciences, Delft University of Technology 2629 JB Delft Netherlands
LEPABE - Laboratory for Process Engineering, Environment, Biotechnology and Energy, Faculty of Engineering, University of Porto Rua Dr Roberto Frias 4200-465 Porto Portugal
RSC Adv. 2024 Apr 22;14(18):12888-12896. doi: 10.1039/d4ra00971a. eCollection 2024 Apr 16.
Cellulose membranes were prepared from an EMIMAc ionic liquid solution by nonsolvent-induced phase separation (NIPS) in coagulation baths of water-acetone mixtures, ethanol-water mixtures and water at different temperatures. High water volume fractions in the coagulation bath result in a highly reproducible gel-like structure with inhomogeneities observed by small-angle neutron scattering (SANS). A structural transition of cellulose takes place in water-acetone baths at very low water volume fractions, while a higher water bath temperature increases the size of inhomogeneities in the gel-like structure. These findings demonstrate the value of SANS for characterising and understanding the structure of regenerated cellulose films in their wet state. Such insights can improve the engineering and structural tuning of cellulose membranes, either for direct use or as precursors for carbon molecular sieve membranes.
通过在不同温度的水 - 丙酮混合物、乙醇 - 水混合物和水的凝固浴中进行非溶剂诱导相分离（NIPS），从EMIMAc离子液体溶液制备纤维素膜。凝固浴中高水体积分数导致具有通过小角中子散射（SANS）观察到的不均匀性的高度可重现的凝胶状结构。在水 - 丙酮浴中，纤维素在非常低的水体积分数下发生结构转变，而较高的水浴温度会增加凝胶状结构中不均匀性的尺寸。这些发现证明了SANS在表征和理解再生纤维素膜湿态结构方面的价值。这些见解可以改善纤维素膜的工程设计和结构调整，无论是直接使用还是作为碳分子筛膜的前体。
