Journal article
Deposition of Colloidal Drops Containing Ellipsoidal Particles: Competition between Capillary and Hydrodynamic Forces
Langmuir, v 32(45), pp 11899-11906
15 Nov 2016
PMID: 27788012
Featured in Collection : UN Sustainable Development Goals @ Drexel
Abstract
Ellipsoidal particles have previously been shown to suppress the coffee-ring effect in millimeter-sized colloidal droplets. Compared to their spherical counterparts, ellipsoidal particles experience stronger adsorption energy to the drop surface where the anisotropy-induced deformation of the liquid-air interface leads to much greater capillary attractions between particles. Using inkjet-printed colloidal drops of varying drop size, particle concentration, and particle aspect ratio, the present work demonstrates how the suppression of the coffee ring is not only a function of particle anisotropy but rather a competition between the propensity for particles to assemble at the drop surface via capillary interactions and the evaporation-driven particle motion to the contact line. For ellipsoidal particles on the drop surface, the capillary force (F-gamma) increases with the particle concentration and aspect ratio, and the hydrodynamic force (F-mu) increases with the particle aspect ratio but decreases with drop size. When F-gamma/F-mu > 1, the surface ellipsoids form a coherent network inhibiting their migration to the drop contact line, and the coffee-ring effect is suppressed, whereas when F-gamma/F-mu < 1, the ellipsoids move to the contact line, resulting in coffee-ring deposition.
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Details
- Title
- Deposition of Colloidal Drops Containing Ellipsoidal Particles: Competition between Capillary and Hydrodynamic Forces
- Creators
- Dong-Ook Kim - Drexel UniversityMin Pack - Drexel UniversityHan Hu - Drexel UniversityHyoungsoo Kim - Princeton UniversityYing Sun - Drexel University
- Publication Details
- Langmuir, v 32(45), pp 11899-11906
- Publisher
- American Chemical Society; Washington, DC
- Number of pages
- 8
- Resource Type
- Journal article
- Language
- English
- Academic Unit
- College of Engineering
- Web of Science ID
- WOS:000388156000021
- Scopus ID
- 2-s2.0-84995763307
- Other Identifier
- 991019167520904721
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InCites Highlights
Data related to this publication, from InCites Benchmarking & Analytics tool:
- Collaboration types
- Domestic collaboration
- Web of Science research areas
- Chemistry, Multidisciplinary
- Chemistry, Physical
- Materials Science, Multidisciplinary