Optothermophoretic Manipulation of Colloidal Particles
in Nonionic Liquids
Xiaolei Peng
Linhan Lin
Eric H. Hill
Pranaw Kunal
Simon M. Humphrey
Yuebing Zheng
10.1021/acs.jpcc.8b03828.s004
https://acs.figshare.com/articles/media/Optothermophoretic_Manipulation_of_Colloidal_Particles_in_Nonionic_Liquids/6513047
The
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.
2018-06-01 00:00:00
thermophoresi
Nonionic Liquids
molecular-level insight
light-irradiated
Herein
stability
Colloidal Particles
1- butanol
strength
guidance
optothermophoretic manipulation
mechanism
isopropyl alcohol
light-controlled
type
hydrophilicity
molecule
ethanol
interface
temperature field
response
region
Optothermophoretic Manipulation
dynamics simulations
optothermal manipulation