Video microscopic high-temperature measurement of surface tension

Area of Science:

• Physical Chemistry
• Materials Science

Background:

• Surface tension is a critical property influenced by temperature.
• Accurate measurement of temperature-dependent surface tension is essential for various applications.
• Existing methods may have limitations in precise temperature control within confined spaces.

Purpose of the Study:

• To develop and validate a novel micropipette-in-microcapillary method for studying temperature effects on surface tension.
• To precisely control temperature within a microcapillary environment.
• To measure the temperature-dependent surface tension of specific liquids.

Main Methods:

• A micropipette-in-microcapillary experimental setup was designed.
• A tin-doped indium oxide (ITO) thin film was used as a transparent, conductive heating jacket for temperature control.
• The method's precision was validated against published data for water, n-hexadecane, and n-decane at room temperature.

Main Results:

• The developed technique demonstrated high precision, with results in excellent agreement with reference data.
• Temperature-dependent surface tension was measured for n-decane (25°C–110°C) and n-hexadecane (25°C–200°C).
• A consistent linear decrease in surface tension with decreasing temperature was observed for both liquids.

Conclusions:

• The micropipette-in-microcapillary method provides a reliable approach for investigating temperature effects on surface tension.
• The ITO thin film heating jacket enables effective temperature control in microscale measurements.
• The findings contribute valuable data on the thermophysical properties of n-decane and n-hexadecane.