Accurate quantification of hydration number for polyethylene glycol molecules

Guo Wei^{1, 2}, Zhao Lishan², Gao Xin¹, Cao Zexian², Wang Qiang^{2, †}

(color online) (a) Hydration number n_h, (b) critical hydration number n_cr, and (c) n_cr/n_h for PEG molecules as a function of the number of PEG units. The arrow indicates n_cr/n_h = 1.7 for electrolytes.