Experimental Investigation of Dynamic Contact Angles on Horizontal and Inclined Surfaces Part I: Flat Silicon Oxide Surfaces
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Abstract
In the last decades, many attempts have been made to investigate influence quantities on the formation of contact angles and their interpretation. The effect of gravitation on the measured contact angles is a controversially discussed mater. In 1876 J. W. Gibbs already formulated conditions for equilibrium and therefore even for the equilibrium contact angle θe which describe the acting gravitational field on a fluid component. Nevertheless, these relations often are not considered. The presented study illustrates differences between the apparent contact angles of sessile drops which are obtained by dynamical measurements with the inclined-plate and the needle-in method. This fact demonstrates that the force distibution at the triple line additionally differs in dependence on the used measuring method. The force distribution at the triple line depends on the relative position in the gravitational field (e.g. inclined or horizontal sample position) and on the curvature of the liquid-vapour interface (interfacial tension). Hence, theses effects on the apparent contact angles have to be considered for a reasonable interpretation of the measurement data. For this purpose, an approach to describe the effect of forces related to gravity effects on contact angles will be presented.
©2014 Walter de Gruyter Berlin/Boston
Articles in the same Issue
- Frontmatter
- 10.1515/zpch-2014-frontmatter1
- Representation of “Broad” Falloff Curves for Dissociation and Recombination Reactions
- Experimental Investigation of Dynamic Contact Angles on Horizontal and Inclined Surfaces Part I: Flat Silicon Oxide Surfaces
- Pd Supported on SnO2-Al2O3 Composite Supports for CO Oxidation – Designing Thermally Stable and Active Supports for Pd
- A New Catalyst Support Made of Bauxite: Preparation and Catalytic Properties
- Inelastic Neutron Scattering (INS) Study of Low Frequency Vibrations and Hydrogen Bonding of (E)-Benzil Monoxime
- Volumetric and Compressibility Studies of Some 1 : 1 Electrolytes in the Presence of Furosemide Using Transport Properties
- A Computational Study of 1 : 1 and 1 : 2 Complexes of Naphthalene with Dimethyl Ether
Articles in the same Issue
- Frontmatter
- 10.1515/zpch-2014-frontmatter1
- Representation of “Broad” Falloff Curves for Dissociation and Recombination Reactions
- Experimental Investigation of Dynamic Contact Angles on Horizontal and Inclined Surfaces Part I: Flat Silicon Oxide Surfaces
- Pd Supported on SnO2-Al2O3 Composite Supports for CO Oxidation – Designing Thermally Stable and Active Supports for Pd
- A New Catalyst Support Made of Bauxite: Preparation and Catalytic Properties
- Inelastic Neutron Scattering (INS) Study of Low Frequency Vibrations and Hydrogen Bonding of (E)-Benzil Monoxime
- Volumetric and Compressibility Studies of Some 1 : 1 Electrolytes in the Presence of Furosemide Using Transport Properties
- A Computational Study of 1 : 1 and 1 : 2 Complexes of Naphthalene with Dimethyl Ether
