Assembly of cellulose nanocrystals in a levitating drop probed by time-resolved small angle X-ray scattering

Nanoscale
Yingxin LiuLennart Bergström

Abstract

Assembly of bio-based nano-sized particles into complex architectures and morphologies is an area of fundamental interest and technical importance. We have investigated the assembly of sulfonated cellulose nanocrystals (CNC) dispersed in a shrinking levitating aqueous drop using time-resolved small angle X-ray scattering (SAXS). Analysis of the scaling of the particle separation distance (d) with particle concentration (c) was used to follow the transition of CNC dispersions from an isotropic state at 1-2 vol% to a compressed nematic state at particle concentrations above 30 vol%. Comparison with SAXS measurements on CNC dispersions at near equilibrium conditions shows that evaporation-induced assembly of CNC in large levitating drops is comparable to bulk systems. Colloidal states with d vs. c scalings intermediate between isotropic dispersions and unidirectional compression of the nematic structure could be related to the biphasic region and gelation of CNC. Nanoscale structural information of CNC assembly up to very high particle concentrations can help to fabricate nanocellulose-based materials by evaporative methods.

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Citations

Sep 19, 2019·Physical Chemistry Chemical Physics : PCCP·Felix LehmkühlerFlorian Schulz
Apr 28, 2020·Journal of Colloid and Interface Science·Charles BruelMarie-Claude Heuzey
Apr 27, 2021·Biomacromolecules·Livia K BastNico Bruns
Feb 8, 2019·Langmuir : the ACS Journal of Surfaces and Colloids·Yingxin LiuLennart Bergström
Aug 29, 2019·ACS Omega·Cony Gauche, Maria Isabel Felisberti
Jul 2, 2020·Langmuir : the ACS Journal of Surfaces and Colloids·Firas AzzamBruno Jean
Nov 5, 2020·Carbohydrate Polymers·Paavo A PenttiläJukka A Ketoja

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Methods Mentioned

BETA
X-ray
electron microscopy
optical microscopy
Scanning electron microscopy

Software Mentioned

Image J
Origin

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