Preparation of cellulose particles using an ionic liquid.
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 (1)H 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.
Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, Rokko, Nada, Kobe 657-8501, Japan.
Toyoko
T
Suzuki
Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, Rokko, Nada, Kobe 657-8501, Japan.
Kyosuke
K
Kono
Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, Rokko, Nada, Kobe 657-8501, Japan.
Kengo
K
Shimomura
Department of Chemical Science and Engineering, Graduate School of Engineering, Kobe University, Rokko, Nada, Kobe 657-8501, Japan. Electronic address: minamihi@kobe-u.ac.jp.
Hideto
H
Minami
D020001:1-Butanol / Q000737:chemistry; D000473:Alkanes / Q000737:chemistry; D002482:Cellulose / Q000737:chemistry*; D004126:Dimethylformamide / Q000737:chemistry*; D005612:Freeze Drying; D007093:Imidazoles / Q000737:chemistry*; D052578:Ionic Liquids / Q000737:chemistry*; D009682:Magnetic Resonance Spectroscopy; D010316:Particle Size; D017550:Spectroscopy, Fourier Transform Infrared; D013501:Surface-Active Agents / Q000737:chemistry
D000473:Alkanes; D007093:Imidazoles; D052578:Ionic Liquids; D013501:Surface-Active Agents; C502841:1-butyl-3-methylimidazolium chloride; D004126:Dimethylformamide; D020001:1-Butanol; D002482:Cellulose; C007932:n-hexadecane; C109691:microcrystalline cellulose
Cellulose; Colloids; Ionic liquid; Porous structure