Contact angles for liquid drops at a model heterogeneous surface consisting of alternating and parallel hydrophobic/hydrophilic strips

Langmuir

Volumn 12, Issue 7, 1996, Pages 1913-1922

  Drelich, Jaroslaw ^a   Wilbur, James L ^b   Miller, Jan D ^a   Whitesides, George M ^b  

^a UNIVERSITY OF UTAH   (United States)

^b HARVARD UNIVERSITY   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

CALCULATIONS; CONTACT ANGLE; FLUID MECHANICS; MONOLAYERS; SURFACE PHENOMENA; THEORY;

CASSIE EQUATION; HYDROPHILIC STRIPS; HYDROPHOBIC STRIPS; LIQUID DROPS; SELF ASSEMBLED MONOLAYERS;

SURFACES;

EID: 0030567273     PISSN: 07437463     EISSN: None     Source Type: Journal    
DOI: 10.1021/la9509763     Document Type: Article

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22. The liquid drops with a base diameter less than 1 mm were difficult to place on the substrate surface without any disturbance of drop shape, and thus, the contact angles as measured for such small drops were very uncertain and they are not reported in this contribution.
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26. Line tension: the excess free energy of the system at the threephase contact line. The line/pseudo-line tension term is used in this paper to describe the value calculated from the cos θ vs 1/r function. At the present time, we are not able to discuss how close our experimentally-measured pseudo-line tensions are to the actual thermodynamic line tensions.
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28. This assumption with regard to the order of magnitude seems to be reasonable in view of the experimental data obtained for a few systems, see Tables 1 and 2.