Abstract: Various examples are provided related to measuring surface tension. In one example, a method includes levitating a sample using electrostatic levitation; applying a signal to at least one electrode to excite the sample into a n=3 mode of oscillation; capturing images of the sample with a respective image being associated with a particular frequency that is applied to the sample when the respective image is captured; quantifying sample resonance using a projection method of Legendre polynomials based on the plurality of images; and determining a measured resonance frequency of the sample by an analysis of the sample resonance. The sample can be levitated using a feedback-controlled voltage and the applied signal can be swept over a range of frequencies. A system including electrodes, a position sensor, a camera device, and at least one computing device can be used to carry out the method.

Abstract: An exemplary embodiment of an interfacial tension measurement system of the present disclosure is one in which Faraday waves or instability are formed within a vessel of fluids to be tested via electrostatic oscillations. Then, by tracking the amplitude of an applied electrical voltage having an AC harmonic load to the mixture of fluids that result in a Faraday instability, as well as the wavelength of the instability, the interfacial tension measurement system determines the interfacial tension between layers of immiscible liquids present in the vessel.

Abstract: An exemplary embodiment of an interfacial tension measurement system of the present disclosure is one in which Faraday waves or instability are formed within a vessel of fluids to be tested via electrostatic oscillations. Then, by tracking the amplitude of an applied electrical voltage having an AC harmonic load to the mixture of fluids that result in a Faraday instability, as well as the wavelength of the instability, the interfacial tension measurement system determines the interfacial tension between layers of immiscible liquids present in the vessel.