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Clausius-Mossotti relation : ウィキペディア英語版
Clausius–Mossotti relation
The Clausius–Mossotti relation is named after the Italian physicist Ottaviano-Fabrizio Mossotti, whose 1850 book analyzed the relationship between the dielectric constants of two different media, and the German physicist Rudolf Clausius, who gave the formula explicitly in his 1879 book in the context not of dielectric constants but of indices of refraction. The same formula also arises in the context of conductivity, in which it is known as Maxwell's formula. It arises yet again in the context of refractivity, in which it is known as the Lorentz–Lorenz equation.
The Clausius–Mossotti law applies to the dielectric constant of a dielectric that is perfect, homogeneous and isotropic. It is the second of the following three equalities:
: \frac \cdot \frac = \frac \cdot \frac = \frac = \frac
where
*\epsilon = \epsilon_r\epsilon_0 is the dielectric constant of a substance
*\epsilon_0 is the permittivity of a vacuum
*M is the molar mass of the substance
*d is its density
*N_A is Avogadro's number,
*\alpha is the molecular polarizability in SI-units (C·m2/V) and
*\alpha' = \alpha/(4\pi\varepsilon_0) is the molecular polarizability ''volume'' (m3 in SI) or the polarizability in the CGS system of units.〔
== Clausius–Mossotti factor ==
The Clausius–Mossotti factor can be expressed in terms of complex permittivities:
:K(\omega) = \frac
:\epsilon^
* = \epsilon + \frac = \epsilon - \frac
where
* \epsilon is the permittivity (the subscript p refers to a lossless dielectric sphere suspended in a medium m)
* \sigma is the conductivity
* \omega is the angular frequency of the applied electric field
* i is the imaginary unit, the square root of -1
In the context of electrokinetic manipulation, the real part of the Clausius–Mossotti factor is a determining factor for the dielectrophoretic force on a particle, whereas the imaginary part is a determining factor for the electrorotational torque on the particle. Other factors are, of course, the geometries of the particle to be manipulated and the electric field. Whereas Re(K(\omega)) can be directly measured by application of different AC potentials directly on electrodes,〔T. Honegger, K. Berton, E. Picard et D. Peyrade. Determination of Clausius–Mossotti factors and surface capacitances for colloidal particles. Appl. Phys. Lett., vol. 98, no. 18, page 181906, 2011.〕 Im(K(\omega)) can be measured by electro-rotation measurements thanks to optical trapping methods.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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