Correlation of Line Tension and Solid-Liquid Interfacial Tension from the Measurement of Drop Size Dependence of Contact Angles

Duncan, Dallas; Li, D.; Gaydos, J.; Neumann, A. W.

doi:10.1006/jcis.1995.1032

Cited by 135 publications

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“…When the measured contact angles are essentially constant at different surface locations, the mean contact angle for a specific rate of advancing can be obtained by averaging the contact angles, after the three-phase contact radius reaches 0.4 to 0.5 cm (see later). The purpose of choosing these relatively large drops is to avoid any line tension effects on the measured contact angles 47,48) .…”

Section: Methods and Proceduresmentioning

confidence: 99%

Low-rate dynamic contact angles on poly[styrene-alt-(hexyl/10-carboxydecyl(90/10)maleimide)] and the determination of solid surface tensions

Kwok

Lam

et al. 1999

Macromol. Chem. Phys.

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SUMMARY: Low-rate dynamic contact angles of 14 liquids on a poly[styrene-alt-(hexyl/10-carboxydecyl(90/10)maleimide)] P[S-(H/CM)] were measured by means of an automated axisymmetric drop shape analysis-profile (ADSA-P). It was found that 9 liquids yield non-constant contact angles, and/or dissolve the polymer. From the experimental contact angles of the remaining 5 liquids, it was found that the product of the liquid-vapour surface tension and the cosine of the contact angle changes smoothly with the liquid-vapour surface tension, i. e. c lv cos h depends only on c lv for a given solid surface (or solid surface tension). This contact angle pattern is in harmony with those from other inert and non-inert (polar and non-polar) surfaces. The solid-vapour surface tension calculated from the equation-of-state approach for solid-liquid interfacial tensions was found to be 31.0 mJ/m 2 , with a 95% confidence limit of l0.6 mJ/m 2 from the experimental contact angles of the 5 liquids in Laboratory 1, and c sv = 29.9 mJ/m 2 from measurements with two liquids in Laboratory 2. The difference is essentially due to actual physical differences between the polymer films prepared in the two laboratories.

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Section: Methods and Proceduresmentioning

confidence: 99%

Low-rate dynamic contact angles on poly[styrene-alt-(hexyl/10-carboxydecyl(90/10)maleimide)] and the determination of solid surface tensions

Kwok

Lam

et al. 1999

Macromol. Chem. Phys.

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“…This fluorocarbon coating was chosen because of its inertness and low surface tension (∼12 mJ/m 2 ). FC-732 contains the same film-forming chemical as the FC-721 and FC-722 fluorocarbons used in other studies (21,22,(27)(28)(29)(30)(31), but it uses a perfluorobutyl methyl ether rather than perfluorooctane (FC-721) and 1,1,2,-trichloro-1,2,2,-trifluoroethane (FC-722). Therefore, some of the results from this study can be compared with those from FC-721 and FC-722.…”

Section: Materials (Solid Surfaces and Liquids)mentioning

confidence: 98%

Dynamic Cycling Contact Angle Measurements: Study of Advancing and Receding Contact Angles

Lam

et al. 2001

Journal of Colloid and Interface Science

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“…The line tension has no effect on the measured contact angle of a large volume liquid drop (Amirfazli et al, 1998;Duncan et al, 1995). Figure 3 (Figure 3d) from approximately 0.05 cm 3 to 0.12 cm 3 , using the motorized-syringe mechanism.…”

Section: Resultsmentioning

confidence: 98%

Contact Ratio: A New Precise Measurement for Wettability

Alteraifi

Hirbawi

2008

Can. J. Chem. Eng.

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measurements that are well recognized in the literature (Marmur, 1983;Berg, 1993;de Ruijter et al., 1998). Considering that the velocity of the contact line is the pertinent quantity, it is, therefore, reasonable to regard the change in the contact area as the flux of the process. It is only recently that a rational link has been made between the contact angle and the contact area using spherical cap approximation (de Gennes, 1985).According to Young's equation, the contact angle "θ" is considered as the measurable wettability parameter. The rate of change in the contact angle has been commonly used as the relevant parameter of spreading dynamics notwithstanding the difficulties associated with contact angle measurements that are well recognized in the literature. Considering that the velocity of the contact line is the pertinent quantity, it is, therefore, reasonable to regard the change in the contact area as the flux of the process. In this study, we have introduced a new measuring parameter for wettability based on the liquid/solid contact area. The term "contact ratio" has been coined to account for this new measurable parameter. The contact ratio is defined as the ratio between the spreading contact area of liquid over solid surface and the surface area of the spherical drop before spreading. The measurements of contact areas and low-rate dynamic contact angles for various liquid/solid systems were conducted independently using the ADSA-P technique. The theoretical relation between the contact ratio and the contact angle is derived based on spherical cap approximation. The results show that there is a good correlation between the theoretical relation and the experimental values. Since the contact angle of a specific system is a unique parameter of the system, the contact ratio can also be presented as a unique parameter of the system. Nevertheless, contact ratio presents a more precise measure of wettability.Selon l'équation de Young, l'angle de contact « θ » est considéré comme le paramètre de mouillabilité mesurable. La vitesse de changement dans l'angle de contact a été communément utilisée comme paramètre pertinent des dynamiques de diffusion sans tenir compte des difficultés liées aux mesures d'angle de contact qui sont bien reconnues dans la littérature scientifique. Considérant que la vitesse de la ligne de contact est la quantité pertinente, il est par raisonnable de regarder le changement dans la zone de contact comme le flux du procédé. Dans cette étude, nous avons introduit un nouveau paramètre de mesure pour la mouillabilité basé sur la zone de contact liquide/solides. Le terme « rapport de contact » a été inventé pour représenter ce nouveau paramètre mesurable. Le rapport de contact se définit comme le rapport entre la zone de contact de diffusion du liquide sur la surface de solide et la surface de la goutte sphérique avant la diffusion. Des mesures de zones de contact et d'angles de contact dynamiques de faible vitesse pour différents systèmes liquide-solide ont été réalisées indépendamment à...

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Correlation of Line Tension and Solid-Liquid Interfacial Tension from the Measurement of Drop Size Dependence of Contact Angles

Cited by 135 publications

References 0 publications

Low-rate dynamic contact angles on poly[styrene-alt-(hexyl/10-carboxydecyl(90/10)maleimide)] and the determination of solid surface tensions

Low-rate dynamic contact angles on poly[styrene-alt-(hexyl/10-carboxydecyl(90/10)maleimide)] and the determination of solid surface tensions

Dynamic Cycling Contact Angle Measurements: Study of Advancing and Receding Contact Angles

Contact Ratio: A New Precise Measurement for Wettability

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