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Plasmonic effects in Au-Ag nanostructures are utilized to realize novel electrochromic device. A quasi ordered Au-Ag core-shell nanoparticle array is realized by thermal evaporation of Au and electrochemical deposition of Ag into a SiO 2 hole array assisted by anodic aluminium oxide membranes. The thickness of the Ag shell could be changed by alternating the electrochemical deposition time: as a result, the color of the device can be widely and quasireversibly tuned through this electrical control.

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Solubility isotherms for the ternary system MgCl 2 −MgSO 4 −H 2 O and the quaternary reciprocal system Li + , Mg 2+ //Cl − , SO 4 2− −H 2 O were determined at 298.15 K by an isothermal dissolution method. In the ternary phase diagram, there are six solubility branches corresponding to the solid phases MgSO 4 •nH 2 O (s) (n = 7, 6, 5, 4, 1) and MgCl 2 •6H 2 O (s) . In the quaternary equilibrium phase diagram, there are 16 solubility co-saturated lines corresponding to the solid phases MgSO 4 • nH 2 O (s) (n = 7, 6, 5, 4, 1), MgCl 2 •6H 2 O (s) , Li 2 SO 4 •H 2 O (s) , LiCl•MgCl 2 •7H 2 O (s) , and LiCl•H 2 O (s) . This report describes for the first time that the equilibrium solid phases MgSO 4 •H 2 O (s) and MgSO 4 •4H 2 O (s) have been found to exist in this quaternary system. However, the phase field of MgSO 4 •H 2 O (s) overlaps with the phase fields of MgSO 4 •4H 2 O (s) and MgSO 4 •5H 2 O (s) , which indicates that MgSO 4 •4H 2 O (s) and MgSO 4 •5H 2 O (s) are metastable phases; MgSO 4 •H 2 O (s) is a relatively more stable phase in both the ternary and quaternary systems. A Pitzer−Simonson−Clegg thermodynamic model was used to simulate the properties of the sub-binary and subternary systems and to predict the solubility phase diagram of the quaternary system. The results of the modeling are in reasonable agreement with the experimental data.