One-Step Production of Anisotropically Etched Graphene Using Supercritical Water

We developed a one-step method for production of anisotropically etched graphene using supercritical fluid (SCF). Anisotropic etching of a graphite substrate and dispersed graphite powder with Ag nanoparticles was conducted in supercritical water (SCW). Because of the exfoliation effect of SCF, graphene was isolated from the graphite simultaneously with the anisotropic etching. High-resolution transmission electron microscopy (HRTEM) and Raman spectroscopy revealed the production of multilayer graphene exfoliated from the anisotropically etched graphite surface

Stereoselective Photodimerization of 3‑Arylindenones in Solution and in the Solid State

Photodimerization of 3-arylindenones in solution and in the solid state was examined. Irradiation of 3-arylindenones in benzene exclusively gave <i>C</i>₂-symmetric <i>anti</i>-HH cyclobutane dimers in good yields. In contrast, photolysis in the solid state afforded <i>syn</i>-HH cyclobutane dimers efficiently, which was considerably influenced by the molecular arrangement in the crystal lattice

Stereoselective Photodimerization of 3‑Arylindenones in Solution and in the Solid State

Photodimerization of 3-arylindenones in solution and in the solid state was examined. Irradiation of 3-arylindenones in benzene exclusively gave <i>C</i>₂-symmetric <i>anti</i>-HH cyclobutane dimers in good yields. In contrast, photolysis in the solid state afforded <i>syn</i>-HH cyclobutane dimers efficiently, which was considerably influenced by the molecular arrangement in the crystal lattice

Rudiment musical ou exposé des premiers éléments de la musique

Appartient à l’ensemble documentaire : MethMusi

Exfoliated MoS₂ and MoSe₂ Nanosheets by a Supercritical Fluid Process for a Hybrid Mg–Li-Ion Battery

The ultrathin two-dimensional nanosheets of layered transition-metal dichalcogenides (TMDs) have attracted great interest as an important class of materials for fundamental research and technological applications. Solution-phase processes are highly desirable to produce a large amount of TMD nanosheets for applications in energy conversion and energy storage such as catalysis, electronics, rechargeable batteries, and capacitors. Here, we report a rapid exfoliation by supercritical fluid processing for the production of MoS₂ and MoSe₂ nanosheets. Atomic-resolution high-angle annular dark-field imaging reveals high-quality exfoliated MoS₂ and MoSe₂ nanosheets with hexagonal structures, which retain their 2H stacking sequence. The obtained nanosheets were tested for their electrochemical performance in a hybrid Mg–Li-ion battery as a proof of functionality. The MoS₂ and MoSe₂ nanosheets exhibited the specific capacities of 81 and 55 mA h g^–1, respectively, at a current rate of 20 mA g^–1