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Optothermophoretic Manipulation of Colloidal Particles in Nonionic Liquids
journal contribution
posted on 2018-06-01, 00:00 authored by Xiaolei Peng, Linhan Lin, Eric H. Hill, Pranaw Kunal, Simon M. Humphrey, Yuebing ZhengThe
response of colloidal particles to a light-controlled external
temperature field can be harnessed for optothermophoretic manipulation
of the particles. The thermoelectric effect is regarded as the driving
force for thermophoretic trapping of particles at the light-irradiated
hot region, which is thus limited to ionic liquids. Herein, we achieve
optothermophoretic manipulation of colloidal particles in various
nonionic liquids, including water, ethanol, isopropyl alcohol, and
1-butanol, and establish the physical mechanism of the manipulation
at the molecular level. We reveal that the nonionic driving force
originates from a layered structure of solvent molecules at the particle–solvent
interface, which is supported by molecular dynamics simulations. Furthermore,
the effects of hydrophilicity, solvent type, and ionic strength on
the layered interfacial structures and thus the trapping stability
of particles are investigated, providing molecular-level insight into
thermophoresis and guidance on interfacial engineering for optothermal
manipulation.
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thermophoresiNonionic Liquidsmolecular-level insightlight-irradiatedHereinstabilityColloidal Particles1- butanolstrengthguidanceoptothermophoretic manipulationmechanismisopropyl alcohollight-controlledtypehydrophilicitymoleculeethanolinterfacetemperature fieldresponseregionOptothermophoretic Manipulationdynamics simulationsoptothermal manipulation
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