How Wenzel and Cassie were wrong

被引：680

作者：

Gao, Lichao ^{[1
]}

McCarthy, Thomas J. ^{[1
]}

机构：

[1] Univ Massachusetts, Dept Polymer Sci & Engn, Amherst, MA 01003 USA

来源：

LANGMUIR | 2007年 / 23卷 / 07期

关键词：

D O I：

10.1021/la062634a

中图分类号：

O6 [化学];

学科分类号：

0703 ;

摘要：

We argue using experimental data that contact lines and not contact areas are important in determining wettability. Three types of two-component surfaces were prepared that contain "spots" in a surrounding field: a hydrophilic spot in a hydrophobic field, a rough spot in a smooth field, and a smooth spot in a rough field. Water contact angles were measured within the spots and with the spot confined to within the contact line of the sessile drop. Spot diameter and contact line diameter were varied. All of the data indicate that contact angle behavior (advancing, receding, and hysteresis) is determined by interactions of the liquid and the solid at the three-phase contact line alone and that the interfacial area within the contact perimeter is irrelevant. The point is made that Wenzel's and Cassie's equations are valid only to the extent that the structure of the contact area reflects the ground state energies of contact lines and the transition states between them.

引用

页码：3762 / 3765

页数：4

共 24 条

[11] Contact angle hysteresis on rough hydrophobic surfaces [J].

He, B ;

Lee, J ;

Patankar, NA .

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 2004, 248 (1-3) :101-104

[12]

Johnson R. E., 1964, ADV CHEM SER, P112, DOI DOI 10.1021/BA-1964-0043.CH007

[13] Superhydrophobic states [J].

Lafuma, A ;

Quéré, D .

NATURE MATERIALS, 2003, 2 (07) :457-460

[14] Wetting and dewetting of structured and imprinted surfaces [J].

Lipowsky, R ;

Lenz, P ;

Swain, PS .

COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS, 2000, 161 (01) :3-22

[15] Ultrahydrophobic surfaces.: Effects of topography length scales on wettability [J].

Öner, D ;

McCarthy, TJ .

LANGMUIR, 2000, 16 (20) :7777-7782

[16] Laminar drag reduction in microchannels using ultrahydrophobic surfaces [J].

Ou, J ;

Perot, B ;

Rothstein, JP .

PHYSICS OF FLUIDS, 2004, 16 (12) :4635-4643

[17] Mimicking the lotus effect: Influence of double roughness structures and slender pillars [J].

Patankar, NA .

LANGMUIR, 2004, 20 (19) :8209-8213

[18] On the modeling of hydrophobic contact angles on rough surfaces [J].

Patankar, NA .

LANGMUIR, 2003, 19 (04) :1249-1253

[19] Transition between superhydrophobic states on rough surfaces [J].

Patankar, NA .

LANGMUIR, 2004, 20 (17) :7097-7102

[20]

Quéré D, 2003, NANOTECHNOLOGY, V14, P1109, DOI 10.1088/0957-4484/14/10/307

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