Transport and trapping of nanosheets via hydrodynamic forces and curvature-induced capillary quadrupolar interactions

JOURNAL OF COLLOID AND INTERFACE SCIENCE

卷:531

Article

Lee, Timothy J.¹  Lewallen, Colby F.¹  Bumbarger, Daniel J.²  Yunker, Peter J.³  Reid, R. Clay²  Forest, Craig R.¹ 

[1] Georgia Inst Technol, GW Woodruff Sch Mech Engn, Atlanta, GA 30332 USA

[2] Allen Inst Brain Sci, Seattle, WA 98109 USA

[3] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA

关键词: Nanosheet;    Capillary interactions;    Quadrupolar;    Hydrodynamic;    Trapping;    Microfluidics;   

DOI  :  10.1016/j.jcis.2018.07.068

来源: Elsevier

【 摘 要 】

Hypothesis: The manipulation of nanosheets on a fluid-fluid interface remains a significant challenge. At this interface, hydrodynamic forces can be used for long-range transport (>1 x capillary length) but are difficult to utilize for accurate and repeatable positioning. While capillary multipole interactions have been used for particle trapping, how these interactions manifest on large but thin objects, i.e., nanosheets, remains an open question. Hence, we posit hydrodynamic forces in conjunction with capillary multipole interactions can be used for nanosheet transport and trapping. Experiments: We designed and characterized a fluidic device for transporting and trapping nanosheets on the water-air interface. Analytical models were compared against optical measurements of the nanosheet behavior to investigate capillary multipole interactions. Energy-based modeling and dimensional analysis were used to study trapping stability. Findings: Hydrodynamic forces and capillary interactions successfully transported and trapped nanosheets at a designated trapping location with a repeatability of 10% of the nanosheet's length and 12% of its width (length = 1500 mu m, width = 1000 mu m) and an accuracy of 20% of their length and width. Additionally, this is the first report that surface tension forces acting upon nanoscale-thick objects manifest as capillary quadrupolar interactions and can be used for precision manipulation of nanosheets. (C) 2018 Elsevier Inc. All rights reserved.

【 授权许可】

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