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Capillary Assembly of Anisotropic Particles at Cylindrical Fluid-Fluid Interfaces

Eatson, Jack L.; Gordon, Jacob R.; Cegielski, Piotr; Giesecke, Anna L.; Suckow, Stephan; Rao, Anish; Silvestre, Oscar F.; Liz-Marzán, Luis M.; Horozov, Tommy S.; Buzza, D. Martin A.

Authors

Jack L. Eatson

Jacob R. Gordon

Piotr Cegielski

Anna L. Giesecke

Stephan Suckow

Anish Rao

Oscar F. Silvestre

Luis M. Liz-Marzán



Abstract

The unique behavior of colloids at liquid interfaces provides exciting opportunities for engineering the assembly of colloidal particles into functional materials. The deformable nature of fluid-fluid interfaces means that we can use the interfacial curvature, in addition to particle properties, to direct self-assembly. To this end, we use a finite element method (Surface Evolver) to study the self-assembly of rod-shaped particles adsorbed at a simple curved fluid-fluid interface formed by a sessile liquid drop with cylindrical geometry. Specifically, we study the self-assembly of single and multiple rods as a function of drop curvature and particle properties such as shape (ellipsoid, cylinder, and spherocylinder), contact angle, aspect ratio, and chemical heterogeneity (homogeneous and triblock patchy). We find that the curved interface allows us to effectively control the orientation of the rods, allowing us to achieve parallel, perpendicular, or novel obliquely orientations with respect to the cylindrical drop. In addition, by tuning particle properties to achieve parallel alignment of the rods, we show that the cylindrical drop geometry favors tip-to-tip assembly of the rods, not just for cylinders, but also for ellipsoids and triblock patchy rods. Finally, for triblock patchy rods with larger contact line undulations, we can achieve strong spatial confinement of the rods transverse to the cylindrical drop due to the capillary repulsion between the contact line undulations of the particle and the pinned contact lines of the sessile drop. Our capillary assembly method allows us to manipulate the configuration of single and multiple rod-like particles and therefore offers a facile strategy for organizing such particles into useful functional materials.

Citation

Eatson, J. L., Gordon, J. R., Cegielski, P., Giesecke, A. L., Suckow, S., Rao, A., …Buzza, D. M. A. (2023). Capillary Assembly of Anisotropic Particles at Cylindrical Fluid-Fluid Interfaces. Langmuir : the ACS journal of surfaces and colloids, 39(17), 6006–6017. https://doi.org/10.1021/acs.langmuir.3c00016

Journal Article Type Article
Acceptance Date Apr 7, 2023
Online Publication Date Apr 18, 2023
Publication Date May 2, 2023
Deposit Date May 15, 2023
Publicly Available Date May 18, 2023
Journal Langmuir
Print ISSN 0743-7463
Electronic ISSN 1520-5827
Publisher American Chemical Society
Peer Reviewed Peer Reviewed
Volume 39
Issue 17
Pages 6006–6017
DOI https://doi.org/10.1021/acs.langmuir.3c00016
Keywords Energy; Interaction energies; Interfaces; Magnetic properties; Particles
Public URL https://hull-repository.worktribe.com/output/4289684

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