Evaporative properties and pinning strength of laser-ablated, hydrophilic sites on lotus-leaf-like, nanostructured surfaces

Melissa L. McLauchlin, Dongqing Yang, P. Aella, Antonio Garcia, S. T. Picraux, Mark Hayes

Research output: Contribution to journalArticle

29 Citations (Scopus)

Abstract

Wetting, evaporative, and pinning strength properties of hydrophilic sites on superhydrophobic, nanostructured surfaces were examined. Understanding these properties is important for surface characterization and designing features in self-cleaning, lotus-leaf-like surfaces. Laser-ablated, hydrophilic spots between 250 μm and 2 mm in diameter were prepared on silicon nanowire (NW) superhydrophobic surfaces. For larger circumference pinning sites, initial contact angle measurements resemble the contact angle of the surface within the pinning site: 65-69°. As the drop volume is increased, the contact angles approach the contact angle of the NW surface without pinning sites: 171 -176°. The behavior of water droplets on the pinning sites is governed by how much of the water droplet is being influenced by the superhydrophobic NW surfaces versus the hydrophilic areas. During the evaporation of sinapic acid solution, drops are pinned by the spots except for the smaller circumference sites. Pinning strengths of the hydrophilic sites are a linear function of the pinning spot circumference. Protein samples prepared and deposited on the pinning sites for analysis by matrix-assisted laser desorption ionization indicate an improvement in sensitivity from that of a standard plate analysis by a factor of 5.

Original languageEnglish (US)
Pages (from-to)4871-4877
Number of pages7
JournalLangmuir
Volume23
Issue number9
DOIs
StatePublished - Apr 24 2007

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leaves
Lasers
Contact angle
lasers
circumferences
Nanowires
nanowires
Water
Silicon
Angle measurement
Ionization
Wetting
Cleaning
Desorption
Evaporation
cleaning
water
wetting
Proteins
desorption

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Colloid and Surface Chemistry

Cite this

Evaporative properties and pinning strength of laser-ablated, hydrophilic sites on lotus-leaf-like, nanostructured surfaces. / McLauchlin, Melissa L.; Yang, Dongqing; Aella, P.; Garcia, Antonio; Picraux, S. T.; Hayes, Mark.

In: Langmuir, Vol. 23, No. 9, 24.04.2007, p. 4871-4877.

Research output: Contribution to journalArticle

McLauchlin, Melissa L. ; Yang, Dongqing ; Aella, P. ; Garcia, Antonio ; Picraux, S. T. ; Hayes, Mark. / Evaporative properties and pinning strength of laser-ablated, hydrophilic sites on lotus-leaf-like, nanostructured surfaces. In: Langmuir. 2007 ; Vol. 23, No. 9. pp. 4871-4877.
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