Translation of "Sessile drop" in German

Sessile drop with fitted contour (shown in green)

The contact angle is calculated from the width of a sessile drop and its height at the apex.

The sessile drop is the standard arrangement for optical measurement of the contact angle using drop shape analysis.

With the height-width method, it is assumed that the shape of the sessile drop describes a circular arc on the surface.

In this way, surface tension and density of polymer melts can be determined simultaneously by analyzing the shape of a sessile drop.

A common method used is the sessile drop technique, in which the contact angle formed is determined for a liquid placed on the surface.

With the conic section method, it is assumed that the shape of the sessile drop describes an elliptical arc on the surface.

In practice, the sessile drop method and the tilting plate method are often used to determine static contact angle and contact angle hysteresis of a drop of liquid on a surface.

For example, when a water drop is deposited on a real horizontal surface, the water forms a symmetrical drop, where the measured contact angle is known as the static contact angle (sessile drop method).

Coatings according to the invention whose contact angle hysteresis in water is no more than 20°, especially preferably no more than 18° and most especially preferably no more than 15°, measured according to the sessile drop method and the tilting plate method, are preferred.

The resulting angle between the tangent and the surface to be measured is known as the static contact angle (sessile drop method).

Coatings according to the present invention preferably possess a static water contact angle, measured with the sessile drop method (see Examples section for procedure), of up to 90°, preferably up to 70°, more preferably up to 55°, and even more preferably up to 45°.

The method was implemented as a static angle of contact measurement according to the Sessile Drop method with deionized water and a drop volume of 3.5 microliters (?l).

The angle thereby obtained between the tangent and the surface to be measured is referred to as the “static” contact angle (sessile drop method).

It is preferred to use a silicone surfactant as the used compound i), since it has been found surprisingly in the course of this invention that very low contact angles can be produced in the polyether matrix with these compounds, as determined by the “sessile drop” method.

The wetting angles were in each case determined by the sessile drop method, using equipment from the Krüss GmbH company of Hamburg, Germany.

The good initial wettability of the mixtures is important for the accurately detailed impression from the impression material in the patient's mouth during processing and in the first contact with wet oral/dental substance, and is manifested by a low contact angle of less than 50°, in particular less than or equal to 45°, measured with a contact angle measuring instrument from the Kruss Company at 20° C. by the “sessile drop” method.

Usually the wetting of ceramic materials by melts is described by the specification of a wetting angle, which is usually determined by the use of a heating microscope according to the method of the "sessile drop".

With the circle method (circular segment method), it is assumed that the shape of the sessile drop describes a circular arc on the surface.

Instead of placing a drop on the solid as in the case of the sessile drop, a bubble of air is injected beneath a solid, the surface of which is located in the liquid.

With a sessile drop under the effect of gravity, the curvature is affected by the hydrostatic pressure resulting from the weight of the liquid.

With the Young-Laplace fit, parameters of an equation system which models the shape of the sessile drop are determined by means of numerical analysis.

The drop shape is analysed based on the shape of an ideal sessile drop, the surface curvature of which results only from the force equilibrium between surface tension and weight.

In the frequently considered case of a sessile drop on a solid surface in air when measuring the contact angle, this is the transition point between the liquid/solid, liquid/gaseous and solid/gaseous boundary lines.

A drop is metered onto a solid sample (sessile drop) or is located at the tip of a needle (pendant drop).

The surface energy of the effect pigments surface-modified in Example 1 and 2 is determined by the “sessile drop” method using the measurement liquids water, 1,2-diiodomethane, benzyl alcohol and 1,2 pentanediol using a Krüss DAS 100 measuring instrument at 22-24° C. 5 ?l drops are placed semi-automatically on a pigment layer by means of the Krüss “DAS 3”, release 1.7.1 control and evaluation software, and the contact angles between drop and pigment layer surface are measured.

Drop shape analysis  (DSA): The contact angle is measured using the image of a sessile drop at the points of intersection (three-phase contact points) between the drop contour and the projection of the surface (baseline).