Determination Method and Size Dependence of Interfacial Tension between Nanoparticles and a Solution

Area of Science:

• Materials Science
• Physical Chemistry
• Nanotechnology

Background:

• Interfacial tension is crucial for nanomaterial applications but difficult to measure experimentally.
• The influence of particle size on interfacial tension remains largely undetermined.
• Existing methods for determining interfacial properties are often experimentally challenging.

Purpose of the Study:

• To introduce a novel method for determining interfacial tension and its temperature coefficients using nanoparticle electrodes.
• To investigate the size dependence of interfacial tension and its temperature coefficient for nano-gold (Nano-Au) in aqueous solutions.
• To explore the applicability of this method for determining Tolman length and atomic radius.

Main Methods:

• Utilized nano-gold particles with varying radii (0.9 to 37.4 nm) in an aqueous solution.
• Determined interfacial tension and temperature coefficients by measuring the electrode potential of nanoparticle electrodes.
• Applied the method to calculate Tolman length and atomic radius.

Main Results:

• Established a correlation between particle size and interfacial tension/temperature coefficient for Nano-Au.
• Observed that decreasing particle size increases interfacial tension and the absolute value of the temperature coefficient.
• Found that size effects on interfacial tension and temperature coefficient become negligible for radii exceeding 10 nm.
• Determined a negative Tolman length, largely unaffected by temperature.

Conclusions:

• The proposed electrode potential method offers a convenient and reliable way to measure interfacial tension, temperature coefficients, Tolman length, and atomic radius.
• The size dependence of interfacial properties provides critical data for nanomaterial preparation and application.
• This research offers new insights into the behavior of nanomaterials at interfaces.