Preparation of cellulose particles using an ionic liquid

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• 作者：Toyoko Suzuki ; Kyosuke Kono ; Kengo Shimomura ; Hideto Minami
• 关键词：Colloids ; Cellulose ; Ionic liquid ; Porous structure
• 刊名：Journal of Colloid and Interface Science
• 出版年：15 March, 2014
• 年：2014
• 卷：418
• 期：Complete
• 页码：126-131
• 全文大小：1440 K

文摘

Cellulose is a ubiquitous natural fiber used in various industrial materials and applications. We prepared micron-sized cellulose particles by the solvent releasing method (SRM) in which cellulose-[Bmim]Cl-N,N-dimethylformamide (DMF) droplets are dispersed in hexadecane (HD) containing dissolved surfactant. The dispersion is then poured into a large amount of 1-butanol. Since 1-butanol is miscible with HD, [Bmim]Cl, and DMF but not with cellulose, the cellulose particles precipitate out. FTIR and ¹H NMR analyses confirmed that this technique precipitated cellulose and completely removed [Bmim]Cl and DMF from the cellulose-[Bmim]Cl-DMF droplets. Interestingly, the obtained cellulose particles were almost the same size as the original droplets (cellulose, 7 wt%), indicating a microporous structure of the cellulose particles with a large medium content. Although the microporous structure collapsed as the medium evaporated, it was maintained by a freeze-drying technique.