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Title: Controlling negative and positive photothermal migration of centimeter-sized droplets
Authors: Ichikawa, Masatoshi  kyouindb  KAKEN_id  orcid (unconfirmed)
Takabatake, Fumi
Miura, Keitaro
Iwaki, Takafumi
Magome, Nobuyuki
Yoshikawa, Kenichi
Author's alias: 市川, 正敏
Issue Date: 18-Jul-2013
Publisher: American Physical Society
Journal title: Physical Review E
Volume: 88
Issue: 1
Thesis number: 012403
Abstract: The photoinduced motion of an oil droplet on an aqueous solution under local irradiation by a green laser is reported. The results showed that a repulsive force is generated on pure water, while an attractive force is observed with an aqueous solution containing a surfactant. The driving force is discussed in terms of a thermal Marangoni effect. The switching on the photothermal effect is interpreted by taking into account the advection caused by the spatial gradient of the surface tension under local heating by a laser. A numerical model revealed that the geometrical profile of the surface tension around the droplet determines the mode of advection around the droplet and causes switching in the direction of migrations.
Rights: ©2013 American Physical Society
DOI(Published Version): 10.1103/PhysRevE.88.012403
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