Kruss Gmbh, Wissenschaftliche Laborgerate

Kruess Gmbh, Wissenschaftliche Laborgeraete

Kruess Gmbh Wissenschaftliche Laborgerate

Krüss Gmbh

Bernd Friedrich

Florian S Weser

Jan-Gerd Frerichs

Marlitt Jönsson

Carsten Scheithauer

Alexander Buchholz

Eike Kortz

Tim Kristjan Stüven

Arne Kordts

Timo Fuckner

Florian Weser

Tom Bergmann

A method for analyzing an interaction between a sample surface and a drop of liquid comprises applying the drop of liquid to the sample surface and illuminating the drop of liquid using at least two light sources. The at least two light sources are each arranged at a light source position surrounding the drop of liquid. Light reflected from the drop of liquid detecting and a sensor position on a sensor of a camera is determined for each detected light reflection. Light source positions are assigned to individual light source positions. A position of the drop of liquid is calculated relative to the sensor and an item of size information of the drop of liquid is determined. The position and the item of size information are calculated from the pairs of one sensor position and one associated light source position.

Method and device for analyzing the interaction between a surface of a sample and a liquid

A contact angle measurement apparatus includes a liquid reservoir arrangement, a drop dosing device in fluid communication with the liquid reservoir arrangement and adapted for applying a liquid drop onto a sample surface, an illuminating device for illuminating each drop applied by the drop dosing device and disposed on the surface from a first side, and an image recording device for recording an image of each applied drop disposed on the surface. A liquid pressurizing system is adapted to pressurize liquid from the liquid reservoir arrangement, and a controller connected to the valve of each drop dosing device and to the liquid pressurizing system, which controls the operation of the liquid pressurizing system and, for each drop dosing device, opening and closing of the respective valve to apply a drop of the respective liquid from the respective liquid line to the surface in a jet of pressurized liquid.

Contact angle measurement apparatus

A drop on a sample surface in a gaseous environment has a curved surface with a symmetry axis and a defined volume. To determine the contact angle, an object is imaged based on the reflection property of the surface of the drop, the position of the object with respect to the optical axis of an optical measuring system and the position of the object with respect to the sample surface, with the symmetry axis of the drop being arranged in or in the vicinity of the optical axis. The distance between the image and the optical axis of the drop is measured. The radius of curvature of the drop is determined based on the measured distance, and the contact angle is determined from the radius of curvature.

Method and device for contact angle determination from radius of curvature of drop by optical distance measurement

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Hasloh, Germany

Bernd Friedrich