deletions | additions       diff --git a/Experiments_Cubes_Wires_PVP_facet__.tex b/Experiments_Cubes_Wires_PVP_facet__.tex  index 03f05f7..95a4651 100644  --- a/Experiments_Cubes_Wires_PVP_facet__.tex  +++ b/Experiments_Cubes_Wires_PVP_facet__.tex 
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Previous efforts of experimentalists and theoriests to decipher the shape control mechanism will be described respectively below.  The scope of this review will be on the polyol synthesis of Ag nanocrystals in the presence of PVP as the structure directing agent.  It has long been suspected that PVP might interact more strongly with the \{100\} facets than with the \{111\} facets because the presence of PVP allows \{100\} faceted Ag nanocrystals such as cubes \cite{Sun_2002b} and wires \cite{Sun_2002} to be formed.  The first evidence that PVP preferentially binds to \{100\} facets over \{111\} facets of Ag nanocrystals was given by Xia et al. \cite{Sun_2003}.