Photon control of liquid motion on reversibly photoresponsive surfaces

Dongqing Yang, Marcin Piech, Nelson S. Bell, John Devens Gust, Sean Vail, Antonio A. Garcia, John Schneider, Choong Do Park, Mark A. Hayes, S. T. Picraux

Research output: Contribution to journalArticle

64 Citations (Scopus)

Abstract

The movement of a liquid droplet on a flat surface functionalized with a photochromic azobenzene may be driven by the irradiation of spatially distinct areas of the drop with different UV and visible light fluxes to create a gradient in the surface tension. In order to better understand and control this phenomenon, we have measured the wetting characteristics of these surfaces for a variety of liquids after UV and visible light irradiation. The results are used to approximate the components of the azobenzene surface energy under UV and visible light using the van Oss-Chaudhury-Good equation. These components, in combination with liquid parameters, allow one to estimate the strength of the surface interaction as given by the advancing contact angle for various liquids. The azobenzene monolayers were formed on smooth air-oxidized Si surfaces through 3-aminopropylmethyldiethoxysilane linkages. The experimental advancing and receding contact angles were determined following azobenzene photoisomerization under visible and ultraviolet (UV) light. Reversible light-induced advancing contact-angle changes ranging from 8 to 16° were observed. A large reversible change in contact angle by photoswitching of 12,4° was achieved for water. The millimeter-scale transport of 5 μL droplets of certain liquids was achieved by creating a spatial gradient in visible/UV light across the droplets. A criterion for light-induced motion of droplets is shown to be consistent with the response of a variety of liquids. The type of light-driven fluid movement observed could have applications in microfluidic devices.

Original languageEnglish
Pages (from-to)10864-10872
Number of pages9
JournalLangmuir
Volume23
Issue number21
DOIs
Publication statusPublished - Oct 9 2007

Fingerprint

Azobenzene
Photons
Contact angle
photons
Liquids
liquids
ultraviolet radiation
Irradiation
Photoisomerization
gradients
irradiation
microfluidic devices
trucks
Interfacial energy
Microfluidics
linkages
surface reactions
wetting
surface energy
Surface tension

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Yang, D., Piech, M., Bell, N. S., Gust, J. D., Vail, S., Garcia, A. A., ... Picraux, S. T. (2007). Photon control of liquid motion on reversibly photoresponsive surfaces. Langmuir, 23(21), 10864-10872. https://doi.org/10.1021/la701507r

Photon control of liquid motion on reversibly photoresponsive surfaces. / Yang, Dongqing; Piech, Marcin; Bell, Nelson S.; Gust, John Devens; Vail, Sean; Garcia, Antonio A.; Schneider, John; Park, Choong Do; Hayes, Mark A.; Picraux, S. T.

In: Langmuir, Vol. 23, No. 21, 09.10.2007, p. 10864-10872.

Research output: Contribution to journalArticle

Yang, D, Piech, M, Bell, NS, Gust, JD, Vail, S, Garcia, AA, Schneider, J, Park, CD, Hayes, MA & Picraux, ST 2007, 'Photon control of liquid motion on reversibly photoresponsive surfaces', Langmuir, vol. 23, no. 21, pp. 10864-10872. https://doi.org/10.1021/la701507r
Yang D, Piech M, Bell NS, Gust JD, Vail S, Garcia AA et al. Photon control of liquid motion on reversibly photoresponsive surfaces. Langmuir. 2007 Oct 9;23(21):10864-10872. https://doi.org/10.1021/la701507r
Yang, Dongqing ; Piech, Marcin ; Bell, Nelson S. ; Gust, John Devens ; Vail, Sean ; Garcia, Antonio A. ; Schneider, John ; Park, Choong Do ; Hayes, Mark A. ; Picraux, S. T. / Photon control of liquid motion on reversibly photoresponsive surfaces. In: Langmuir. 2007 ; Vol. 23, No. 21. pp. 10864-10872.
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