Materials Map

Discover the materials research landscape. Find experts, partners, networks.

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The Materials Map is an open tool for improving networking and interdisciplinary exchange within materials research. It enables cross-database search for cooperation and network partners and discovering of the research landscape.

The dashboard provides detailed information about the selected scientist, e.g. publications. The dashboard can be filtered and shows the relationship to co-authors in different diagrams. In addition, a link is provided to find contact information.

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The Materials Map is still under development. In its current state, it is only based on one single data source and, thus, incomplete and contains duplicates. We are working on incorporating new open data sources like ORCID to improve the quality and the timeliness of our data. We will update Materials Map as soon as possible and kindly ask for your patience.

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in Cooperation with on an Cooperation-Score of 37%

Topics

Publications (1/1 displayed)

  • 2019Anisotropic Diffusion and Phase Behavior of Cellulose Nanocrystal Suspensions24citations

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Chart of shared publication
Lombardo, Salvatore
1 / 4 shared
Thielemans, Wim
1 / 14 shared
Kang, Kyongok
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Schütz, Christina
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Gençer Phd, Mrsc, Alican
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Kumar, Sugam
1 / 3 shared
Rie, Jonas Van
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Gasser, Urs
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2019

Co-Authors (by relevance)

  • Lombardo, Salvatore
  • Thielemans, Wim
  • Kang, Kyongok
  • Schütz, Christina
  • Gençer Phd, Mrsc, Alican
  • Kumar, Sugam
  • Rie, Jonas Van
  • Gasser, Urs
OrganizationsLocationPeople

article

Anisotropic Diffusion and Phase Behavior of Cellulose Nanocrystal Suspensions

  • Lombardo, Salvatore
  • Salazar-Alvarez, Germán
  • Thielemans, Wim
  • Kang, Kyongok
  • Schütz, Christina
  • Gençer Phd, Mrsc, Alican
  • Kumar, Sugam
  • Rie, Jonas Van
  • Gasser, Urs
Abstract

<p>In this paper, we use dynamic light scattering in polarized and depolarized modes to determine the translational and rotational diffusion coefficients of concentrated rodlike cellulose nanocrystals in aqueous suspension. Within the range of studied concentrations (1-5 wt %), the suspension starts a phase transition from an isotropic to an anisotropic state as shown by polarized light microscopy and viscosity measurements. Small-angle neutron scattering measurements also confirmed the start of cellulose nanocrystal alignment and a decreasing distance between the cellulose nanocrystals with increasing concentration. As expected, rotational and translational diffusion coefficients generally decreased with increasing concentration. However, the translational parallel diffusion coefficient was found to show a local maximum at the onset of the isotropic-to-nematic phase transition. This is attributed to the increased available space for rods to move along their longitudinal axis upon alignment. This increased parallel diffusion coefficient thus confirms the general idea that rodlike particles gain translational entropy upon alignment while paying the price for losing rotational degrees of freedom. Once the concentration increases further, diffusion becomes more hindered even in the aligned regions due to a reduction in the rod separation distance. This leads once again to a decrease in translational diffusion coefficients. Furthermore, the relaxation rate for fast mode translational diffusion (parallel to the long particle axis) exhibited two regimes of relaxation behavior at concentrations where significant alignment of the rods is measured. We attribute this unusual dispersive behavior to two length scales: one linked to the particle length (at large wavevector q) and the other to a twist fluctuation correlation length (at low wavevector q) along the cellulose nanocrystal rods that is of a larger length when compared to the actual length of rods and could be linked to the size of aligned domains.</p>

Topics
  • impedance spectroscopy
  • phase
  • anisotropic
  • viscosity
  • phase transition
  • isotropic
  • cellulose
  • small-angle neutron scattering
  • dynamic light scattering
  • aligned
  • Polarized light microscopy