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Tunable Aqueous Virtual Micropore
Author(s) -
Park Jae Hyun,
Guan Weihua,
Reed Mark A.,
Krstić Predrag S.
Publication year - 2012
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201101739
Subject(s) - levitation , brownian motion , particle (ecology) , quadrupole , nanopore , electric field , materials science , dipole , radius , aqueous solution , chemical physics , particle size , viscosity , mechanics , classical mechanics , physics , nanotechnology , chemistry , atomic physics , composite material , oceanography , computer security , quantum mechanics , computer science , magnet , geology
A charged microparticle can be trapped in an aqueous environment by forming a narrow virtual pore—a cylindrical space region in which the particle motion in the radial direction is limited by forces emerging from dynamical interactions of the particle charge and dipole moment with an external radiofrequency quadrupole electric field. If the particle satisfies the trap stability criteria, its mean motion is reduced exponentially with time due to the viscosity of the aqueous environment; thereafter the long‐time motion of particle is subject only to random, Brownian fluctuations, whose magnitude, influenced by the electrophoretic and dielectrophoretic effects and added to the particle size, determines the radius of the virtual pore, which is demonstrated by comparison of computer simulations and experiment. The measured size of the virtual nanopore could be utilized to estimate the charge of a trapped micro‐object.