title: Viscoelastic Properties of Core-Shell-Structured, Hemicellulose-Rich Nanofibrillated Cellulose in Dispersion and Wet-Film States.
abstract: We report the viscoelastic properties of core-shell-structured, hemicellulose-rich nanofibrillated cellulose (NFC) in dispersion and wet-film states. The hemicellulose-rich NFC (hemicellulose neutral sugars 23%, carboxylate 0.2 mmol g(-1)), prepared from Japanese persimmons, had a core crystallite thickness of 2.3 nm and unit fibril thickness of 4.2 nm. A carboxylate-rich NFC (hemicellulose neutral sugars 7%, carboxylate 0.9 mmol g(-1)) with crystallite and fibril widths of 2.5 and 3.3 nm, respectively, was used as a reference. The solid-concentration dependencies of the storage moduli of gel-like water dispersions of the hemicellulose-rich NFC were weaker than those of carboxylate-rich NFC, and the dispersions were loosely flocculated even at high salt concentrations and low pH values. The viscoelastic properties of wet NFC films were similar to those of their dispersions; the hemicellulose-rich NFC films were significantly less sensitive to salt concentration and pH and were soft and swollen at high salt concentrations and low pH values.
authors.affiliation: Department of Biomaterials Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo , Tokyo 113-8657, Japan.
authors.forename: Reina
authors.initials: R
authors.lastname: Tanaka
authors.affiliation: Department of Biomaterials Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo , Tokyo 113-8657, Japan.
authors.forename: Tsuguyuki
authors.initials: T
authors.lastname: Saito
authors.affiliation: Department of Forest Products Technology, School of Chemical Technology, Aalto University , FI-00076 Aalto, Finland.
authors.forename: Tuomas
authors.initials: T
authors.lastname: Hänninen
authors.affiliation: Department of Biomaterials Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo , Tokyo 113-8657, Japan.
authors.forename: Yuko
authors.initials: Y
authors.lastname: Ono
authors.affiliation: High Performance Fibre Products, VTT Technical Research Center of Finland Ltd , FI-02044 VTT, Espoo, Finland.
authors.forename: Minna
authors.initials: M
authors.lastname: Hakalahti
authors.affiliation: High Performance Fibre Products, VTT Technical Research Center of Finland Ltd , FI-02044 VTT, Espoo, Finland.
authors.forename: Tekla
authors.initials: T
authors.lastname: Tammelin
authors.affiliation: Department of Biomaterials Science, Graduate School of Agricultural and Life Sciences, The University of Tokyo , Tokyo 113-8657, Japan.
authors.forename: Akira
authors.initials: A
authors.lastname: Isogai
mesh_terms: D002482:Cellulose / Q000737:chemistry*; D004548:Elasticity; D057139:Nanofibers / Q000737:chemistry*; D011134:Polysaccharides / Q000737:chemistry*; D014783:Viscosity; D014867:Water / Q000737:chemistry*
chemical_list: D011134:Polysaccharides; D014867:Water; C007916:hemicellulose; D002482:Cellulose