Buldyrev and Stanley model
The Buldyrev and Stanley model consists of a double shoulder plus a square well (Ref. 1 Eq. 1):
- Failed to parse (Conversion error. Server ("https://wikimedia.org/api/rest_") reported: "Cannot get mml. Server problem."): {\displaystyle \Phi \left(r\right)=\left\{{\begin{array}{ccc}\infty &;&r<a\\U_{1}&;&a\leq r<b_{1}\\U_{2}&;&b_{1}\leq r<b_{2}\\-U_{A}&;&b_{2}\leq r<c\\0&;&r\geq c\end{array}}\right.}
where and Failed to parse (SVG (MathML can be enabled via browser plugin): Invalid response ("Math extension cannot connect to Restbase.") from server "https://wikimedia.org/api/rest_v1/":): {\displaystyle U_A>0} .