“Bjerrum length”的意思、由来-开放百科全书

词条

Bjerrum length

释义

References

The Bjerrum length (after Danish chemist Niels Bjerrum 1879–1958

^[1])

is the separation at which the electrostatic interaction between two

elementary charges is comparable in magnitude to the thermal energy scale,

, where is the Boltzmann constant and is the

absolute temperature in kelvins. This length scale arises naturally in discussions of electrostatic,

electrodynamic and electrokinetic phenomena in electrolytes, polyelectrolytes and colloidal dispersions.

^[2]

In standard units, the Bjerrum length is given by

where is the elementary charge, is the relative dielectric constant of the medium

and is the vacuum permittivity.

For water at

room temperature (), , so that

In Gaussian units, and the Bjerrum length has the simpler form

References

1. ^http://www.rsc.org/delivery/_ArticleLinking/DisplayArticleForFree.cfm?doi=TF959550X001&JournalCode=TF
2. ^{{cite book | last1=Russel | first1=William B. | first2=D. A. | last2=Saville | first3=William R. | last3=Schowalter | title=Colloidal Dispersions | publisher=Cambridge University Press | location=New York | year=1989}}

2 : Physical chemistry|Colloidal chemistry

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