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\begin{itemize}  \item Depends on whether the particle is charged or not: consider {\it uncharged} for now.  \item \citet{2010PhRvL.104m8302P}, \citet{1982JFM...117..107A}, \citet{onne_Ybert_Ajdari_Bocquet_2008}  \item An osmotic pressure gradient the interfacial layer leads to drift velocity $V_{\rm DP} = \mu\nabla c$.Now need to find variance.  \end{itemize}  \item {\it What are the statistics of this motion -- how much variance is there?}  \begin{itemize}   \item Look at notes. Imagine density/concentration/probability instead of a single particle.   \end{itemize}  \item {\it Which part of this setup is out of equilibrium?}