Skip to main content
main-content

Tipp

Weitere Artikel dieser Ausgabe durch Wischen aufrufen

09.03.2016 | Original Paper | Ausgabe 3/2016

Cellulose 3/2016

Structure of cellulose/direct dye complex regenerated from supercritical water

Zeitschrift:
Cellulose > Ausgabe 3/2016
Autoren:
Hitomi Miyamoto, Yoshiaki Yuguchi, Dmitry M. Rein, Yachin Cohen, Kazuyoshi Ueda, Chihiro Yamane

Abstract

The regeneration of cellulose from supercritical water in the presence of direct dyes was studied by small- and wide-angle synchrotron X-ray scattering and cryo-transmission electron microscopy to understand the effects of dyes on the structure formation of cellulose. In addition, the interactions between cellulose and the direct dyes were characterized using molecular dynamics simulations. Peaks corresponding to cellulose II crystals were observed in the wide-angle X-ray diffraction pattern of cellulose regenerated from supercritical water without dyes, whereas these peaks were not observed in the diffraction patterns of samples with direct dye (Direct Red 28 or Direct Blue 1). This result indicated that the direct dyes prevented the crystallization of regenerated cellulose. The results of the molecular dynamics simulations indicated that the planes of glucose rings interacted with the aromatic moieties of the dyes and that the sulfonate groups of the dye molecules interacted with the hydroxyl groups of cellulose. In addition, the CH groups of the glucose rings and aromatic moieties of the dyes (e.g., naphthalene and biphenyl moieties) interacted weekly. When cellulose regenerates from solution, cellulose sheet structures formed via hydrophobic interactions appear as the initial structure. The direct dyes were found to affect the formation of this cellulose sheet structure because cellulose molecularly dissolved in supercritical water. In the Kratky plots for small-angle X-ray scattering, a peak was clearly observed for the cellulose and cellulose/DR28 samples in the region of smaller q (<0.5), indicating that the nanoscale assembly structures dispersed in these systems. Bundled sheet-like and twisted ribbon-like structures were observed in the supernatants of the cellulose and cellulose/DR28 samples. These dispersed structures were considered to be intermediates in the structural formation of cellulose.

Bitte loggen Sie sich ein, um Zugang zu diesem Inhalt zu erhalten

Sie möchten Zugang zu diesem Inhalt erhalten? Dann informieren Sie sich jetzt über unsere Produkte:

Springer Professional "Technik"

Online-Abonnement

Mit Springer Professional "Technik" erhalten Sie Zugriff auf:

  • über 50.000 Bücher
  • über 380 Zeitschriften

aus folgenden Fachgebieten:

  • Automobil + Motoren
  • Bauwesen + Immobilien
  • Business IT + Informatik
  • Elektrotechnik + Elektronik
  • Energie + Umwelt
  • Maschinenbau + Werkstoffe




Testen Sie jetzt 30 Tage kostenlos.

Springer Professional "Wirtschaft+Technik"

Online-Abonnement

Mit Springer Professional "Wirtschaft+Technik" erhalten Sie Zugriff auf:

  • über 69.000 Bücher
  • über 500 Zeitschriften

aus folgenden Fachgebieten:

  • Automobil + Motoren
  • Bauwesen + Immobilien
  • Business IT + Informatik
  • Elektrotechnik + Elektronik
  • Energie + Umwelt
  • Finance + Banking
  • Management + Führung
  • Marketing + Vertrieb
  • Maschinenbau + Werkstoffe
  • Versicherung + Risiko

Testen Sie jetzt 30 Tage kostenlos.

Literatur
Über diesen Artikel

Weitere Artikel der Ausgabe 3/2016

Cellulose 3/2016 Zur Ausgabe