Preparation and characterization of cellulose nanocrystals from rice straw

Ping Lu, You Lo Hsieh

Research output: Contribution to journalArticlepeer-review

366 Scopus citations

Abstract

Pure cellulose have been isolated from rice straw at 36% yield and hydrolyzed (64% H2SO4, 8.75 mL/g, 45 °C) for 30 and 45 min to cellulose nanocrystals (CNCs), i.e., CNC30 and CNC45, respectively. CNC45 was smaller (11.2 nm wide, 5.06 nm thick and 117 nm long) than CNC30 (30.7 nm wide, 5.95 nm thick and 270 nm long). Freeze-drying of diluted CNC suspensions showed both assembled into long fibrous structures: ultra-fine fibers (∼400 nm wide) from CNC45 and 1-2 μm wide broad ribbons interspersed with CNC clusters from CNC30. The self-assembled fibers from CNC30 and CNC45 were more highly crystalline (86.0% and 91.2%, respectively) and contained larger crystallites (7.36 nm and 8.33 nm, respectively) than rice straw cellulose (61.8%, 4.42 nm). These self-assembled fibers had essentially nonporous or macroporous structures with the CNCs well aligned along the fiber axis. Furthermore, the self-assembled ultra-fine fibers showed extraordinary structural stability, withstanding vigorous shaking and prolong stirring in water.

Original languageEnglish (US)
Pages (from-to)564-573
Number of pages10
JournalCarbohydrate Polymers
Volume87
Issue number1
DOIs
StatePublished - Jan 4 2012
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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