Neutral cylindrical cell model
= Neutral cylindrical cell model
{title2=$E(R)=0$}
Confine the <counterions> of a uniformly charged infinite cylinder within a coaxial cylinder of radius $R$, with total mobile line charge $\lambda$. The <electric field> vanishes at $R$, while its surface value at $a$ is fixed by the bare line charge. This gives $a\phi'(a)=2\lambda/\epsilon$ and $R\phi'(R)=0$ in <Gaussian units>. Sending $R/a\to\infty$ defines the <infinite-dilution limit of cylindrical counterions>.