Optical Surface Tension Measurement of Two-Dimensionally Confined Liquid Surfaces

Chung, M. Y.; Pigot, Christian; Volz, Sébastian; Hibara, Akihide

doi:10.1021/acs.analchem.7b01611

Cited by 9 publications

(7 citation statements)

References 30 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…24−27 Via QELS, the spontaneous resonance of thermally induced capillary waves has been demonstrated on liquid surfaces with spatial confinement in a microchannel 28 and 2D-confined apertures. 29 In these experiments, capillary-wave modes satisfying the resonant conditions continue oscillating, and those under nonresonant conditions soon disappear. Therefore, the characteristic peaks corresponding to the resonant modes appear in the QELS power spectrum.…”

Section: ■ Introductionmentioning

confidence: 89%

“…In this context, the quasielastic light scattering (QELS) method has been successfully used to measure Doppler shift during laser light scattering by capillary waves. − Via QELS, the spontaneous resonance of thermally induced capillary waves has been demonstrated on liquid surfaces with spatial confinement in a microchannel and 2D-confined apertures . In these experiments, capillary-wave modes satisfying the resonant conditions continue oscillating, and those under nonresonant conditions soon disappear.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Spherical Spontaneous Capillary-Wave Resonance on Optically Trapped Aerosol Droplet

et al. 2018

Self Cite

View full text Add to dashboard Cite

We report a contactless surface tension measurement method of micrometer-sized aerosol droplets. In this method, we assume spherical spontaneous resonance of a thermally induced capillary wave. First, an aerosol droplet with a radius ranging from 4.7 to 12.4 μm is trapped by means of a simple single-beam optical trapping configuration, and the frequency shift power spectrum of the light passing the droplet is measured. The spectrum in each case exhibits several peaks in a frequency range of several tens to several hundred kilohertz. The peak frequencies agree well with theoretical ones predicted by the spherical resonant modes. After validating the above-mentioned assumption, we measure the surface tension of aerosol droplets containing sodium dodecyl sulfate, and we successfully obtain the surface tension value. The present method utilizes just two phenomena, that is, the droplet surface light scattering and spontaneous resonance of the capillary wave. These can be easily observed in aerosol droplets, and they can be utilized to gain scientific insights. The present method based on the nature of droplets can be used in various applications in aerosol science.

show abstract

Section: ■ Introductionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Spherical Spontaneous Capillary-Wave Resonance on Optically Trapped Aerosol Droplet

et al. 2018

Self Cite

View full text Add to dashboard Cite

show abstract

“…We coupled the EDB with the quasi-elastic light scattering (QELS) method to measure the surface tension of a levitated droplet. This technique has been discussed in the literature. ,, Here, we will present a brief summary. The QELS method measures the frequency shifts of scattered light by thermally induced capillary waves at the gas–liquid interface.…”

Section: Methodsmentioning

confidence: 99%

In Situ Surface Tension Measurement of Deliquesced Aerosol Particles

et al. 2023

Self Cite

View full text Add to dashboard Cite

The surface tension of aerosol particles can potentially affect cloud droplet activation. Hence, direct measurement of the surface tensions of deliquesced aerosol particles is essential but is challenging. Here, we report in situ surface tension measurements based on a novel method that couples a linear quadrupole electrodynamic balance (EDB) with quasi-elastic light scattering (QELS). The EDB-QELS is validated using surface tension measurements of atmospherically relevant inorganic and organic droplets. The surface tension results reasonably agree with the reference values in the range of ∼50−90 mN m −1 . We find a significant size dependence for sodium chloride droplets containing surface-active species (sodium dodecyl sulfate) in the size range of ∼5−18 μm. The surface tension increases from ∼55 to 80 mN m −1 with decreased size. Relative humidity (RH)-dependent surface tensions of mixed ammonium sulfate (AS) and polyethylene glycol droplets reveal the onset of liquid−liquid phase separation. Droplets containing water-soluble matter extracted from ambient aerosol samples and 2.3−2.9 M AS exhibit a ∼30% reduction in surface tension in the presence of ∼50 mmol-C L −1 water-soluble organic carbon, compared to pure water (∼72 mN m −1 ). The approach can offer size-resolved and RH-dependent surface tension measurements of deliquesced aerosol particles.

show abstract

“…14,15 The technique relies on two phenomena to achieve aerosol droplet capture and surface tension analysis, the first is the use of a focused laser that acts as an optical tweezer, and the second is the use of quasi-elastic laser scattering (QELS). [32][33][34][35][36][37][38][39][40] Spontaneous spherical resonance occurs as a result of thermal fluctuations at the surface of the liquid droplet, which can be observed in the Hz range of frequencies in a QELS spectrum. Figure 6 shows the experimental setup used to immobilize aerosol droplets using an optical tweezer as well as the use of QELS to analyze the spherical resonance modes at the droplet surface.…”

Section: Spontaneous Capillary Wave Resonance and Light Scattering Mementioning

confidence: 99%

Aerosol Droplet Surface Measurement Methods

2020

Self Cite

View full text Add to dashboard Cite

Aerosol droplets play a critical role in the development of weather patterns yet are notoriously difficult to analyze because of their small size, transient nature and potentially complex composition. As a result, there has been a surge in recent years of analysis techniques aimed at the study of aerosol droplets, namely of their surface tension properties, which is suspected of playing a great role in aerosol/cloud growth and subsequently impacting the resulting weather patterns. To capture the state of the field at this key time, we have collected and described some of the most relevant and influential studies, with a focus on those that have had the most impact. This review will present and describe the most used analytical techniques for studying the surface tension of micrometer sized aqueous droplets with an eye towards historical trends and how the current techniques are posed to revolutionize the field.

show abstract

Optical Surface Tension Measurement of Two-Dimensionally Confined Liquid Surfaces

Cited by 9 publications

References 30 publications

Spherical Spontaneous Capillary-Wave Resonance on Optically Trapped Aerosol Droplet

Spherical Spontaneous Capillary-Wave Resonance on Optically Trapped Aerosol Droplet

In Situ Surface Tension Measurement of Deliquesced Aerosol Particles

Aerosol Droplet Surface Measurement Methods

Contact Info

Product

Resources

About