Thermal molecular focusing: tunable cross effect of phoresis and light-driven hydrodynamic focusing. Issue 26 (21st June 2018)

• Record Type: Journal Article
• Authors: Fukuyama, Tatsuya; Nakama, Sho; Maeda, Yusuke T.
• Is Part Of: Soft matter. Volume 14:Issue 26(2018)
• Page Start: 5519
• Page End: 5524
• Publication Date: 2018-06-21
• Subjects: Soft condensed matter -- Periodicals; 530.413
• DOI: 10.1039/c8sm00754c
• Languages: English
• ISSNs: 1744-683X

Abstract

Abstract : A moving temperature gradient controls molecular transport with frequency-tunable hydrodynamic focusing in a polymer solution. 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.