Ion-Induced Formation of Nanocrystalline Cellulose Colloidal Glasses Containing Nematic Domains

Langmuir : the ACS Journal of Surfaces and Colloids
Pascal BertschPeter Fischer

Abstract

Controlling the assembly of colloids in dispersion is a fundamental approach toward the production of functional materials. Nanocrystalline cellulose (NCC) is a charged nanoparticle whose colloidal interactions can be modulated from repulsive to attractive by increasing ionic strength. Here, we combine polarized optical microscopy, rheology, and small-angle scattering techniques to investigate (i) the concentration-driven transition from isotropic dispersion to cholesteric liquid crystals and (ii) salt-induced NCC phase transitions. In particular, we report on the formation of NCC attractive glasses containing nematic domains. At increasing NCC concentration, a structure peak was observed in small-angle X-ray scattering (SAXS) patterns. The evolution of the structure peak demonstrates the decrease in NCC interparticle distance, favoring orientational order during the isotropic-cholesteric phase transition. Small amounts of salt reduce the cholesteric volume fraction and pitch by a decrease in excluded volume. Beyond a critical salt concentration, NCC forms attractive glasses due to particle caging and reduced motility. This results in a sharp increase in viscosity and formation of viscoelastic glasses. The presence of nematic d...Continue Reading

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Nov 16, 2018·Langmuir : the ACS Journal of Surfaces and Colloids·Pascal BertschPeter Fischer
Feb 8, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Yingxin LiuLennart Bergström

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Citations

Sep 17, 2020·Nature Communications·Sayyed Ahmad KhademAlejandro D Rey
Mar 27, 2021·Carbohydrate Polymers·Ulises CasadoMirta I Aranguren
Jun 15, 2021·Journal of Colloid and Interface Science·Vincenzo CalabreseAmy Q Shen
May 16, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Pascal Bertsch, Peter Fischer
Oct 2, 2019·ACS Applied Materials & Interfaces·Pascal BertschStefan Gstöhl
Jan 14, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Guang ChuEyal Zussman
Feb 14, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Pascal BertschPeter Fischer

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