| 摘要 |
PROBLEM TO BE SOLVED: To accurately measure a contact angle, and to easily measure dynamic surface tension by using a small quantity of sample liquid. SOLUTION: A sample liquid is sandwiched between parallel plates, and the liquid is held between the plates by surface tension of the sample liquid. At this time, a contact angle is measured by detecting a shape of an interface formed between the plates. Or the contact angle is calculated from a detecting value of interfacial pressure by detecting the interfacial pressure generated inside the sample liquid by surface tension of an interface. Such a method can accurately measure the contact angle by using a small quantity of sample liquid capable of forming the interface between plates. The contact angle is determined by detecting an interfacial shape while moving the interface at a high speed by a method such as changing an interval between the plates, and interfacial pressure is measured. Dynamic surface tension can be determined from the contact angle and the interfacial pressure obtained in this way. Such a method can easily measure the dynamic surface tension.
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