Article

Evaporation behavior of microliter- and sub-nanoliter-scale water droplets on two different fluoroalkylsilane coatings.

Department of Metallurgy and Ceramic Science Graduate School of Science and Engineering, Tokyo Institute of Technology 2-12-1 O-okayama, Meguro-ku, Tokyo 152-8552, Japan.
Langmuir (impact factor: 4.19). 09/2009; 25(20):11998-2001. DOI:10.1021/la902848s pp.11998-2001
Source: PubMed

ABSTRACT The evaporation behavior of microliter (2.0 microL) and subnanoliter (0.8 nL) scale water droplets was investigated on two smooth hydrophobic and hydrophilic fluoroalkylsilane coatings prepared using chemical vapor deposition. The contact angle was constant in the second stage of evaporation for a 2.0 microL droplet on the hydrophobic coating, but it was slightly decreased in the case of a 0.8 nL droplet. The contact angle decreased gradually in the same stage of evaporation for a 2.0 microL droplet on the hydrophilic coating, but it was almost constant for a 0.8 nL droplet. These differences in evaporation behavior are expected to originate from the differences of their magnitudes and signs of line tension.

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Keywords

0.8 nL droplet
 
2.0 microL droplet
 
chemical vapor deposition
 
contact angle
 
differences
 
evaporation
 
evaporation behavior
 
hydrophilic coating
 
hydrophilic fluoroalkylsilane coatings
 
hydrophobic coating
 
line tension
 
smooth hydrophobic