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Issue 26, 2018
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Thermal molecular focusing: tunable cross effect of phoresis and light-driven hydrodynamic focusing

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Abstract

The control of solute flux by either microscopic phoresis or hydrodynamic advection is a fundamental way to transport molecules, which are ubiquitously present in nature and technology. We study the transport of large solutes such as DNA driven by a time-dependent thermal field in a polymer solution. Heat propagation of a heat spot moving back and forth gives rise to the molecular focusing of DNA with frequency-tunable control. We develop a model where the viscoelastic expansion of a solution and the viscosity gradient of a smaller solute are coupled, which explains the underlying hydrodynamic focusing. This effect offers novel non-invasive manipulation of soft and biological materials in a frequency-tunable manner.

Graphical abstract: Thermal molecular focusing: tunable cross effect of phoresis and light-driven hydrodynamic focusing

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Article information


Submitted
11 Apr 2018
Accepted
06 Jun 2018
First published
08 Jun 2018

Soft Matter, 2018,14, 5519-5524
Article type
Paper
Author version available

Thermal molecular focusing: tunable cross effect of phoresis and light-driven hydrodynamic focusing

T. Fukuyama, S. Nakama and Y. T. Maeda, Soft Matter, 2018, 14, 5519
DOI: 10.1039/C8SM00754C

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