Photon-modulated wettability changes on spiropyran-coated surfaces

Rohit Rosario, John Devens Gust, Mark Hayes, Frank Jahnke, Joseph Springer, Antonio A. Garcia

Research output: Contribution to journalArticle

201 Citations (Scopus)

Abstract

A coating of photoresponsive spiropyran molecules covalently bound to a glass surface along with a mixture of organosilanes to control the surface environment was prepared. The relatively nonpolar spiropyran can be reversibly switched to a polar, zwitterionic merocyanine isomer that has a much larger dipole moment by UV light, and back again by visible light. The contact angle was 11°-14° lower for dry, spiropyran-coated surfaces after irradiation with UV than that for dry, spiropyran-coated surfaces after irradiation with visible light. The light-induced changes observed in the surface energy were correlated to the switching of the surface-bound spiropyran molecule between polar and nonpolar forms by means of fluorescence spectroscopy and epifluorescence microscopy. Water in capillary tubes coated with the photosensitive layer was observed to rise when the wavelength of incident light was switched from visible to UV. The UV-induced rise was of the order of 2.8 mm for a 500 μm diameter capillary. This microfluidic actuation of water in an enclosed capillary or microchannel using light is termed "photocapillarity". Contact angle hysteresis prevented the water from flowing back clown the capillary when the light was switched from LTV back to visible.

Original languageEnglish
Pages (from-to)8062-8069
Number of pages8
JournalLangmuir
Volume18
Issue number21
DOIs
Publication statusPublished - Oct 15 2002

Fingerprint

wettability
Wetting
Photons
photons
Contact angle
Water
Irradiation
Capillary tubes
Molecules
water
Dipole moment
Fluorescence spectroscopy
capillary tubes
irradiation
Microchannels
Interfacial energy
Microfluidics
Ultraviolet radiation
Isomers
Hysteresis

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this

Rosario, R., Gust, J. D., Hayes, M., Jahnke, F., Springer, J., & Garcia, A. A. (2002). Photon-modulated wettability changes on spiropyran-coated surfaces. Langmuir, 18(21), 8062-8069. https://doi.org/10.1021/la025963l

Photon-modulated wettability changes on spiropyran-coated surfaces. / Rosario, Rohit; Gust, John Devens; Hayes, Mark; Jahnke, Frank; Springer, Joseph; Garcia, Antonio A.

In: Langmuir, Vol. 18, No. 21, 15.10.2002, p. 8062-8069.

Research output: Contribution to journalArticle

Rosario, R, Gust, JD, Hayes, M, Jahnke, F, Springer, J & Garcia, AA 2002, 'Photon-modulated wettability changes on spiropyran-coated surfaces', Langmuir, vol. 18, no. 21, pp. 8062-8069. https://doi.org/10.1021/la025963l
Rosario R, Gust JD, Hayes M, Jahnke F, Springer J, Garcia AA. Photon-modulated wettability changes on spiropyran-coated surfaces. Langmuir. 2002 Oct 15;18(21):8062-8069. https://doi.org/10.1021/la025963l
Rosario, Rohit ; Gust, John Devens ; Hayes, Mark ; Jahnke, Frank ; Springer, Joseph ; Garcia, Antonio A. / Photon-modulated wettability changes on spiropyran-coated surfaces. In: Langmuir. 2002 ; Vol. 18, No. 21. pp. 8062-8069.
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