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1. (WO2018221124) SURFACE TENSION MEASUREMENT METHOD AND SURFACE TENSION MEASUREMENT DEVICE

Pub. No.:    WO/2018/221124    International Application No.:    PCT/JP2018/017653
Publication Date: Fri Dec 07 00:59:59 CET 2018 International Filing Date: Tue May 08 01:59:59 CEST 2018
IPC: G01N 13/02
G01B 11/255
Applicants: NATIONAL UNIVERSITY CORPORATION KYOTO INSTITUTE OF TECHNOLOGY
国立大学法人京都工芸繊維大学
Inventors: ICHINOSE Nobuyuki
一ノ瀬 暢之
FUJII Kazuki
藤井 一輝
Title: SURFACE TENSION MEASUREMENT METHOD AND SURFACE TENSION MEASUREMENT DEVICE
Abstract:
In a surface tension measurement method, first, a meniscus (M) is produced at the distal end of a pipette (13) at the boundary between air in the pipette (13) and a to-be-measured liquid (S), once the lower end of the pipette (13) has been immersed in the liquid (S). Next, with respect to laser light (LA1, LA2, LA3) passing through the meniscus (M) and a lens (15) from the upper end of the pipette (13), an optical first distance (L1) between the lens (15) and the distal end of the pipette (13) and an optical second distance (L2) between an aperture (22) and the lens (15) are calculated. The radius of curvature of the meniscus (M) is then calculated on the basis of the first distance (L1) and the second distance (L2). Finally, the surface tension of the liquid (S) is calculated from the pressure applied to the meniscus (M) from air supplied within the pipette (13), the pressure applied to the meniscus (M) from the liquid (S), and the radius of curvature of the meniscus (M).