Cellulose Amorphization by Swelling in Ionic Liquid/Water Mixtures: A Combined Macroscopic and Second-Harmonic Microscopy Study

Amorphization of cellulose by swelling in ionic liquid (IL)/water mixtures at room temperature is a suitable alternative to the dissolution–precipitation pretreatment known to facilitate enzymatic digestion. When soaking microcrystalline cellulose in the IL 1‐ethyl‐3‐methylimidazolium acetate contai...

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Vydáno v:ChemSusChem Ročník 8; číslo 1; s. 82 - 86
Hlavní autoři: Glas, Daan, Paesen, Rik, Depuydt, Daphne, Binnemans, Koen, Ameloot, Marcel, De Vos, Dirk E., Ameloot, Rob
Médium: Journal Article
Jazyk:angličtina
Vydáno: Weinheim WILEY-VCH Verlag 01.01.2015
WILEY‐VCH Verlag
Wiley Subscription Services, Inc
Témata:
biomass
Cellulose
Cellulose - chemistry
Imidazoles - chemistry
ionic liquids
Ionic Liquids - chemistry
Ions
Microscopy
spectroscopy
sustainable chemistry
Water - chemistry
biomass
sustainable chemistry
ionic liquids
cellulose
spectroscopy
ISSN:1864-5631, 1864-564X, 1864-564X
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Shrnutí:Amorphization of cellulose by swelling in ionic liquid (IL)/water mixtures at room temperature is a suitable alternative to the dissolution–precipitation pretreatment known to facilitate enzymatic digestion. When soaking microcrystalline cellulose in the IL 1‐ethyl‐3‐methylimidazolium acetate containing 20 wt % water, the crystallinity of the cellulose sample is strongly reduced. As less than 4 % of the cellulose dissolves in this mixture, this swelling method makes a precipitation step and subsequent energy‐intensive IL purification redundant. Second‐harmonic generation (SHG) microscopy is used as a structure‐sensitive technique for in situ monitoring of the changes in cellulose crystallinity. Combined optical and SHG observations confirm that in the pure IL complete dissolution takes place, while swelling without dissolution in the optimal IL/water mixture yields a solid cellulose with a significantly reduced crystallinity in a single step. Soaking as the solution: Soaking of cellulose ionic liquid/water mixtures results in a reduced crystallinity (amorphization). The evolution of cellulose crystallinity is studied in situ by second‐harmonic generation (SHG) microscopy. These results show the potential of soaking in ionic liquid/water mixtures as an alternative cellulose pretreatment method, with the main advantage of avoiding energy‐intensive IL purification, as required in dissolution–precipitation.
Bibliografie:ArticleID:CSSC201402776
IWT Flanders
istex:B9224184A526D7C8C7D6638A8B1C80ACD054E41A
Belgian Science Policy Office
FWO Flanders
Province of Limburg
ark:/67375/WNG-HS94FB7J-8
KU Leuven - No. IOF-KP CO2IL
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:1864-5631
1864-564X
1864-564X
DOI:10.1002/cssc.201402776