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\begin{enumerate}  \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 Consider an  {\it uncharged} particle  for now. \item \citet{2010PhRvL.104m8302P},   \citet{1982JFM...117..107A},   \citet{onne_Ybert_Ajdari_Bocquet_2008} Reading: \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 $V_{\rm DP} = \mu\nabla c$. I have been able to recover something which resembles this sort of.   \item This is a complicated and difficult question -- probably more productive if I just accept the established results and move on to other questions.  \end{itemize}  \item {\it What are the statistics of this motion -- how much variance is there?}