Opto-Thermophoretic Attraction, Trapping, and Dynamic Manipulation of Lipid Vesicles.

Opto-Thermophoretic Attraction, Trapping, and Dynamic Manipulation of Lipid Vesicles.
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DOI:
10.1021/acs.langmuir.8b01979
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发表时间:
2018-11-06
期刊:
Langmuir : the ACS journal of surfaces and colloids
影响因子:
--
通讯作者:
Zheng Y
Zheng Y
中科院分区:
其他
文献类型:
--
作者:
Hill EH;Li J;Lin L;Liu Y;Zheng Y

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Lipid vesicles are important biological assemblies which are critical to biological transport processes, and vesicles prepared in the lab are a workhorse for studies of drug delivery, protein unfolding, biomolecular interactions, compartmentalized chemistry, and stimuli-responsive sensing. Optical tweezers, the current method for holding lipid vesicles in place for single-vesicle studies, suffers from limitations such as high optical power, rigorous optics, and a small difference in the refractive indices of vesicles and water. Herein we report the use of plasmonic heating to trap vesicles in a temperature gradient, allowing long-range attraction, parallel trapping, and dynamic manipulation. The capabilities and limitations with respect to thermal effects on vesicle structure and optical spectroscopy are discussed. This simple approach allows vesicle manipulation using down to three orders of magnitude lower optical power and at least an order of magnitude higher trapping stiffness per unit power than traditional optical tweezers while using a simple optical setup. In addition to the benefit provided by the relaxation of these technical constraints, this technique can complement optical tweezers to allow detailed studies on thermophoresis of optically-trapped vesicles and effects of locally-generated thermal gradients on the physical properties of lipid vesicles. Finally, the technique itself and the large-scale collection of vesicles has huge potential for future studies of vesicles relevant to detection of exosomes, lipid raft formation, and other areas relevant to the life sciences.
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