Isotope Separation: Hydrogen Isotope Separation in Confined Nanospaces: Carbons, Zeolites, Metal–Organic Frameworks, and Covalent Organic Frameworks (Adv. Mater. 20/2019)

Isotope Effects, Isotope Separation and Isotope Fractionation

Colloidal Covalent Organic Frameworks

Covalent organic frameworks (COFs) are two- or three-dimensional (2D or 3D) polymer networks with designed topology and chemical functionality, permanent porosity, and high surface areas. These features are potentially useful for a broad range of applications, including catalysis, optoelectronics, and energy storage devices. But current COF syntheses offer poor control over the material's morph...

Electrochemical isotope effect and lithium isotope separation.

A large electrochemical isotopic effect is observed upon the electrodeposition of lithium from solutions of propylene carbonate producing isotopically light metal deposits. The magnitude of fractionation is controlled by the applied overpotential and is largest close to equilibrium. Calculated partition function ratios for tetrahedrally coordinated lithium complexes and metallic lithium predict...

Application of alkali metal-doped carbons for recovery and isotope separation of hydrogen gas

Alkali metals are able to intercalate graphite expanding carbon-carbon interlayer distance along c-direction [1]. The resulting compound, for example RbC24, has nanospace, whose size is comparable to those of small molecules such as hydrogen, nitrogen, methane, etc. Watanabe et al. [2,3] found out that MC24 (M = K, Rb, Cs) is able to absorb hydrogen up to saturated composition of MC24(H2)2 at 7...

Chemistry of Covalent Organic Frameworks.

Linking organic molecules by covalent bonds into extended solids typically generates amorphous, disordered materials. The ability to develop strategies for obtaining crystals of such solids is of interest because it opens the way for precise control of the geometry and functionality of the extended structure, and the stereochemical orientation of its constituents. Covalent organic frameworks (C...