dc.contributor.author	Pritchard, Cailean Q.	en
dc.contributor.author	Navarro, Fernando	en
dc.contributor.author	Roman, Maren	en
dc.contributor.author	Bortner, Michael J.	en
dc.date.accessioned	2023-04-21T17:45:04Z	en
dc.date.available	2023-04-21T17:45:04Z	en
dc.date.issued	2021-12	en
dc.description.abstract	Hypothesis: Radial capillary flow in evaporating droplets carry suspended nanoparticles to its periphery where they are deposited and form a coffee-ring. Rod-like nanoparticles seeking to minimize their capillary energy will align with their long-axis parallel to the contact line. Particles exhibiting electrostatic repulsion, such as cellulose nanocrystals (CNCs), establish a competition between capillary flow-induced impingement against a growing coffee-ring and entropic minimization leading to enhanced particle mobility. Therefore, balancing these effects by manipulating the local particle concentration in drying droplets should result in deposition with a controlled orientation of CNCs. Experiments: The dynamic local order in aqueous suspensions of CNCs in evaporating sessile droplets was investigated through time-resolved polarized light microscopy. The spatial distribution of alignment in deposited CNCs was explored as a function of nanoparticle concentration, droplet volume, initial degree of anisotropy, and substrate hydrophobicity. Computational analysis of the rotational Péclet number during evaporation was also investigated to evaluate any effects of shear-induced alignment. Findings: Multiple modes of orientation were identified suggesting local control over CNC orientation and subsequent properties can be attained via droplet-based patterning methods. Specifically, high local particle concentrations led to tangential alignment and lower local particle concentrations resulted in new evidence for radial alignment near the center of dried droplets.	en
dc.description.notes	Acknowledgements: The authors gratefully acknowledge generous scholarship support for F. N. by the Mexican department of Education (SEP) through its Professional Development for Teachers program (PROMEP). This project was further supported by the National Research Initiative of the USDA Cooperative State Research, Education and Extension Service, grant number 2005-35504-16088. We thank OMNOVA, Inc. and Tembec, Inc. for supplying the cellulose pulp used in this work. Additionally, we would like to acknowledge the Department of Education GAANN Fellowship program (P200A180016) for their funding and support for this work.	en
dc.description.sponsorship	Department of Education GAANN Fellowship program (P200A180016). USDA Cooperative State Research, Education and Extension Service (2005-35504-16088).	en
dc.description.version	Accepted version	en
dc.format.extent	Pages 450-458	en
dc.format.mimetype	application/pdf	en
dc.identifier.doi	https://doi.org/10.1016/j.jcis.2021.06.069	en
dc.identifier.uri	http://hdl.handle.net/10919/114746	en
dc.identifier.volume	603	en
dc.language.iso	en	en
dc.publisher	Elsevier	en
dc.subject	Evaporation-induced self-assembly	en
dc.subject	Cellulose nanocrystal	en
dc.subject	CNC	en
dc.subject	Rigid rod	en
dc.subject	Radial alignment	en
dc.subject	Tangential alignment	en
dc.subject	PLM	en
dc.title	Multi-axis alignment of Rod-like cellulose nanocrystals in drying droplets	en
dc.title.serial	Journal of Colloid and Interface Science	en
dc.type	Article - Refereed	en
dc.type.dcmitype	Text	en
dc.type.dcmitype	MovingImage	en

Multi-axis alignment of Rod-like cellulose nanocrystals in drying droplets

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