Ryzhikov A, Nouali H, Daou T J, Patarin J
Université de Strasbourg (UdS), Université de Haute Alsace (UHA), Axe Matériaux à PorositéContrôlée (MPC), Institut de Science des Matériaux de Mulhouse (IS2M) UMR 7361, ENSCMu, 3 bis rue Alfred Werner, Mulhouse F-68093, France.
Phys Chem Chem Phys. 2018 Feb 28;20(9):6462-6468. doi: 10.1039/c7cp06520e.
High pressure intrusion-extrusion of concentrated solutions of sodium salts in a pure-silica MFI-type zeolite (Silicalite-1) was studied for potential applications in mechanical energy absorption and storage. It was discovered that the anion nature has a drastic influence on the behavior and the energetic performances of "Silicalite-1 - concentrated NaX solution" systems, where X = Cl, Br, I, NO, NO, ClO and CrO. In the case of NaNO, NaClO, NaCrO, and NaI a combination of bumper and shock-absorber behaviors with a partial irreversible solution intrusion was observed, whereas a fully reversible spring behavior is demonstrated for the intrusion-extrusion of NaBr, NaCl and NaNO solutions. In comparison with water, the intrusion pressure increases for all the solutions except for NaClO one. The irreversibility of intrusion decreases with a dilution rate, and the behavior of the corresponding systems with diluted solutions becomes very close. The variation of the system behavior and intrusion pressure values can be related to a different affinity of the corresponding anions for the pores of Silicalite-1. The samples before and after intrusion-extrusion experiments were characterized using several structural and physicochemical methods (XRD, TGA, solid-state NMR, and N physisorption), but no significant structural difference was observed.
研究了钠盐浓溶液在纯硅MFI型沸石（Silicalite-1）中的高压侵入-挤出，以探索其在机械能吸收和存储方面的潜在应用。研究发现，阴离子性质对“Silicalite-1-浓NaX溶液”体系的行为和能量性能有显著影响，其中X = Cl、Br、I、NO、NO、ClO和CrO。在NaNO、NaClO、NaCrO和NaI的情况下，观察到了缓冲器和减震器行为的组合以及部分不可逆的溶液侵入，而对于NaBr、NaCl和NaNO溶液的侵入-挤出则表现出完全可逆的弹簧行为。与水相比，除NaClO溶液外，所有溶液的侵入压力均增加。侵入的不可逆性随稀释率降低，相应稀溶液体系的行为变得非常相似。体系行为和侵入压力值的变化可能与相应阴离子对Silicalite-1孔隙的不同亲和力有关。使用几种结构和物理化学方法（XRD、TGA、固态NMR和N物理吸附）对侵入-挤出实验前后的样品进行了表征，但未观察到明显的结构差异。
