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\item {\it Understand why it moves (diffusiophoresis): how fast and in what direction?}  \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 $V_{\rm DP} = \mu\nabla c$.  \end{itemize}