Method and apparatus for determining the contact angle of liquid

Details Method and apparatus for determining the contact angle of liquid Method and apparatus for determining the contact angle of liquid

1991-02-05

1992-08-11

Evans, F. L.

Optics: measuring and testing

Angle measuring or angular axial alignment

73 6452, G01B 1126, G01N 1302

Patent

active

051373521

ABSTRACT:
A method and apparatus adapted for the rapid, accurate and repeatable determination of contact angles of liquid droplets applied to curved substrate surfaces. The apparatus includes a support upon which an article may be mounted with the curved substrate surface facing downwardly, a pipette having a discharge end below the downwardly facing curved surface and operable for transferring a predetermined relatively small droplet of a test liquid onto the downwardly facing curved surface, and a contact angle measuring device which includes a lamp for directing a light beam across the suspended droplet such that an image thereof is projected onto a screen from which the contact angle is measurable.

REFERENCES:
patent: 4688938 (1987-08-01), Demoulin et al.
Mclachlan et al., "Apparatus for Measuring the Contact Angles at Crystal Solution Vapor Interfaces", Rev. Sci. Instrum. vol. 46, #1, Jan. 1975.
Wagner, "Spreading of Liquid Drops on Cylindrical Surfaces: Accurate Determination of Contact Angle", J. Appl. Phys., vol. 67, #3, Feb. 1, 1990.

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