deletions | additions       diff --git a/Swimmers.tex b/Swimmers.tex  index 4115b4d..8c1e82b 100644  --- a/Swimmers.tex  +++ b/Swimmers.tex 
...
%%==============================================  \subsection{Answers \& More Details}  DIFFUSIOPHORESIS For {\it charged} interactions, the mobility $\mu\propto 1/c$. This leads to diffusio-phoretic velocity $V = D\nabla\log c$. This arises from the balance of osmotic and viscous forces in the Debye layer. The diffusion coefficient $D \sim T/\eta\ell_{\rm B}$, where $\ell_{\rm B}$ is the Bjerrum length (ratio of electrostatic to thermal energy). Derivation of DP fluid  velocity done in \citet{http://adsabs.harvard.edu/abs/1989AnRFM..21...61A}, page 14ish.