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Heterogeneous Capillary Interactions of Interface-Trapped Ellipsoid Particles Using the Trap-Release Method

Authors
Lim, Jin HyunKim, Jun YoungKang, Dong WooChoi, Kyu HwanLee, Seong JaeIm, Sang HyukPark, Bum Jun
Issue Date
9-1월-2018
Publisher
AMER CHEMICAL SOC
Citation
LANGMUIR, v.34, no.1, pp.384 - 394
Indexed
SCIE
SCOPUS
Journal Title
LANGMUIR
Volume
34
Number
1
Start Page
384
End Page
394
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/77992
DOI
10.1021/acs.langmuir.7b03882
ISSN
0743-7463
Abstract
Heterogeneous capillary interactions between ellipsoid particles at the oil-water interface were measured via optical laser tweezers. Two trapped particles were aligned in either tip-to-tip (tt) or side-to-side (ss) configurations via the double-trap method and were released from the optical traps, leading to particle-particle attractions due to the capillary forces caused by quadrupolar interface deformation. On the basis of image analysis and calculations of the Stokes drag force, the capillary interactions between two ellipsoid particles with the same aspect ratio (E) were found to vary with the particle pairs that were measured, indicating that the interactions were nondeterministic or heterogeneous. Heterogeneous capillary interactions could be attributed to undulation of the interface meniscus due to chemical and/or geometric particle heterogeneity. The power law exponent for the capillary interaction U-cap approximate to r(-beta) was found to be beta approximate to 4 and was independent of the aspect ratio and particle configuration in long-range separations. Additionally, with regard to the tt configuration, the magnitude of the capillary force proportionally increased with the E value (E > 1) when two ellipsoid particles approached each other in the tt configuration.
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