Rotational Analysis of Spherical, Optically Anisotropic Janus Particles by Dynamic Microscopy

Langmuir : the ACS Journal of Surfaces and Colloids
Andrew WittmeierJohn G Gibbs

Abstract

We analyze the rotational dynamics of spherical colloidal Janus particles made from silica (SiO2) with a hemispherical gold/palladium (Au/Pd) cap. Since the refractive index difference between the surrounding fluid and a two-faced, optically anisotropic Janus microsphere is a function of the particle's orientation, it is possible to observe its rotational dynamics with bright-field optical microscopy. We investigate rotational diffusion and constant rotation of single Janus microspheres which are partially tethered to a solid surface so they are free to rotate but show little or no translational motion. Also, since the metal cap is a powerful catalyst in the breakdown of hydrogen peroxide, H2O2, the particles can be activated chemically. In this case, we analyze the motion of coupled Janus dimers which undergo a stable rotary motion about a mutual center. The analysis of both experimental and simulation data, which are microscopy and computer-generated videos, respectively, is based upon individual particle tracking and differential dynamic microscopy (DDM). DDM, which typically requires ensemble averages to extract meaningful information for colloidal dynamics, can be effective in certain situations for systems consisting of s...Continue Reading

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Citations

Apr 20, 2016·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Fabio GiavazziRoberto Cerbino
Nov 23, 2019·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Reece Nixon-Luke, Gary Bryant
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Apr 27, 2021·The European Physical Journal. E, Soft Matter·Fabio GiavazziRoberto Cerbino
Aug 21, 2018·The Journal of Physical Chemistry Letters·Andrew Leeth HolterhoffJohn G Gibbs
Sep 17, 2020·Analytical Chemistry·Wei-Long Chen, Han-Sheng Chuang
Aug 11, 2020·Journal of Colloid and Interface Science·Marlous KampOren A Scherman

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