Tailoring the Morphology of Cellulose Nanocrystals via Controlled Aggregation
arxiv(2024)
摘要
Cellulose nanocrystals (CNCs) are bioderived nanoparticles that can be
isolated from various sources of natural cellulose via acid hydrolysis.
However, the link between particle morphological characteristics and their
ensemble behavior is poorly understood, partly because of the difficulties in
controlling the CNC morphology during their extraction process. In this work,
the impacts of common post-hydrolysis treatments on the CNC morphology are
investigated. The results indicate that the centrifugation step commonly
applied during CNC purification favors the formation of composite particles
made of aligned crystallites, referred to as 'bundles'. Scanning nanobeam
electron diffraction reveals that such bundles are associated preferentially
along their hydrophobic faces. This is in stark contrast to the formation of
misaligned composite particles that can be achieved with ionic treatments,
where an uncontrolled aggregation occurs. The functional relevance of these
morphological differences is demonstrated by their effect on the cholesteric
self-organization of CNCs, with bundles found to exhibit a greater chiral
enhancement, whereas the misaligned composite particles found to promote
gelation. This study reveals the importance of the often-disregarded
purification steps on the final morphology of CNCs and their resulting ensemble
properties, thereby unlocking new routes for tailoring this promising material
towards a variety of applications.
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