TY - JOUR
T1 - Spherical Spontaneous Capillary-Wave Resonance on Optically Trapped Aerosol Droplet
AU - Endo, Takuya
AU - Ishikawa, Kyohei
AU - Fukuyama, Mao
AU - Uraoka, Masaru
AU - Ishizaka, Shoji
AU - Hibara, Akihide
N1 - Funding Information:
We appreciate Yuki Chikasue and Yuta Tanaka of Hiroshima University for their experimental assistance. This work was partially supported by JSPS KAKENHI grant nos 15H03825 and 18H03912, by JSPS-RFBR Japan-Russia Research Cooperative Program, and by the Research Program of the “Dynamic Alliance for Open Innovation Bridging Human, Environment and Materials” in the “Network Joint Research Center for Materials and Devices.” We would like to thank Editage (www.editage.jp) for English language editing.
Publisher Copyright:
© 2018 American Chemical Society.
PY - 2018/9/13
Y1 - 2018/9/13
N2 - 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.
AB - 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.
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U2 - 10.1021/acs.jpcc.8b03784
DO - 10.1021/acs.jpcc.8b03784
M3 - Article
AN - SCOPUS:85052290704
SN - 1932-7447
VL - 122
SP - 20684
EP - 20690
JO - Journal of Physical Chemistry C
JF - Journal of Physical Chemistry C
IS - 36
ER -