Download PDF by Hywel Morgan, Nicolas G. Green: AC Electrokinetic: Colloids and Nanoparticles

January 31, 2018 | Nanotechnology | By admin | 0 Comments

By Hywel Morgan, Nicolas G. Green

ISBN-10: 0585489491

ISBN-13: 9780585489490

ISBN-10: 0863802559

ISBN-13: 9780863802553

This e-book is an creation to the technological know-how at the back of the hot know-how, and explains how the electrical box interacts with the debris. It describes how those micro-systems are synthetic and the way they're used to review homes of the debris. The authors supply a finished remedy of the underlying rules and governing conception for the AC electrokinetic habit of debris, evaluation the present cutting-edge in AC electrokinetic manipulation and characterization of debris, and supply chapters on simulation, equipment layout and fabrication.

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Additional resources for AC Electrokinetic: Colloids and Nanoparticles

Example text

When AC fields are used, the situation is even more so. This section examines the polarisation of a dielectric with a permittivity ε and conductivity σ. It introduces the concept of complex permittivity, which describes the frequency dependent response of the dielectric to the field. Also introduced is the idea of using equivalent circuits, consisting of electrical components, to represent a physical system. 7, which contains a homogeneous dielectric. The plates of the capacitor have area A and separation d, and a dd potential V of angular frequency ω is applied between them.

If the electric field is more or less uniform across the particle. 4. 0 1 10 10 3 10 5 10 7 10 9 Frequency (Hz) Fig. 5 The frequency variation of the real (solid line) and imaginary (dotted line) parts of the Clausius-Mossotti factor for a latex sphere, with σ p >> σ m and ε p << ε m . 2 The effective dipole moment of an ellipsoidal particle The more general case of an ellipsoidal particle is also relevant since many particles are not spherical. g. Jones 1995; Stratton 1941). 6 where the half lengths of the major axes are a1 , a2 and a3 .

The average alignment of the molecules polarises the dielectric. Non-polar dielectrics are materials whose molecules do not possess any permanent dipole moment. An applied electric field causes slight displacement of the individual charges within or around the molecules, giving rise to an induced dipole. 3 Polarisation mechanisms There are three basic molecular polarisation mechanisms that can occur when an electric field is applied to a dielectric: electronic, atomic and orientational (or dipolar).

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AC Electrokinetic: Colloids and Nanoparticles by Hywel Morgan, Nicolas G. Green

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