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Optical Trap Loading of Dielectric Microparticles In Air

Optical Trap Loading of Dielectric Microparticles In Air

Published on: February 5, 2017

Microrheological investigations in ionic liquids using optical trapping techniques.

Richard D Dear¹, Emma K Worrall, William D Gault

¹Department of Chemistry, Physical & Theoretical Chemistry Laboratory, University of Oxford , South Parks Road, Oxford OX1 3QZ, United Kingdom.

The Journal of Physical Chemistry. B

|September 5, 2013

Summary

This study demonstrates optical trapping of melamine particles in ethylammonium nitrate (EAN), a pure ionic liquid. Microrheology reveals EAN

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Area of Science:

Physical Chemistry
Materials Science
Soft Matter Physics

Background:

Ionic liquids (ILs) are versatile solvents with tunable properties.
Microrheology offers a powerful method for probing the viscoelasticity of complex fluids.
Optical trapping provides non-invasive manipulation and measurement capabilities at the microscale.

Purpose of the Study:

To demonstrate optical trapping of melamine particles in ethylammonium nitrate (EAN).
To conduct the first microrheological investigations of EAN using optical trapping.
To explore the rheological properties and temperature-dependent viscosity of EAN.

Main Methods:

Optical trapping of 2.3 μm melamine particles in pure EAN.
Analysis of particle power spectra to determine viscous drag.

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Application of Faxén's law to validate measurements.

Investigation of hydrodynamic coupling between trapped particles.

Temperature-dependent viscosity measurements on micro-liter EAN samples.

Main Results:

Successful optical trapping of melamine particles in EAN was achieved.
Microrheological measurements showed good agreement with Faxén's law, validating the technique.
Hydrodynamic coupling between multiple trapped particles was observed.
Temperature-dependent viscosity of EAN was successfully measured.

Conclusions:

Optical trapping is a viable technique for microrheological studies of ionic liquids like EAN.
This method provides insights into the viscous behavior and hydrodynamic interactions within ILs.
The study opens new avenues for characterizing ILs at the microscale.