AI Article Synopsis
- Cellulose nanocrystals (CNCs) are crystalline structures made from cellulose chains and exhibit anisotropic behavior that affects their interaction with solvents.
- The study measures the Hansen solubility parameters (HSP) of CNCs derived from wood to understand their amphiphilic nature and how they behave in various solvents.
- The results reveal distinct polar and non-polar cohesion parameters, providing insights into the CNCs' chemical affinity and potential applications in solvent systems and materials science.
Article Abstract
Cellulose nanocrystals (CNCs), usually considered as isotropically polar nanoparticles, are sheet-like crystalline assemblies of cellulose chains. Here, we link the anisotropy of the CNC structure to an amphiphilic behavior in suspension. The Hansen solubility parameters (HSP: δ;δ;δ) of wood-based HSO-hydrolyzed CNCs were measured from sedimentation tests in a wide set of 59 solvents and binary mixtures. Two sets of cohesion parameters corresponding to a polar surface (18.1; 20.4; 15.3) ± (0.5; 0.5; 0.4) MPa and to a mildly non-polar one (17.4; 4.8; 6.5) ± (0.3; 0.5; 0.6) MPa were determined, with respective solubility radii of 7.8 and 2.1 MPa. The polar sphere is thought to correspond to the (110) & (11¯0) surfaces of cellulose I nanocrystals, while the smaller non-polar sphere is coherent with the exposure of (200) surfaces. The HSP graph provides new insights on the amphiphilic nature of CNCs and a mapping of their chemical affinity for solvents and polymer matrices.
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| http://dx.doi.org/10.1016/j.carbpol.2018.10.026 | DOI Listing |
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