Rapid fabrication of a lightweight 2 m reaction-bonded SiC aspherical mirror

Design of molecular water oxidation catalysts with earth-abundant metal ions

“…In this context, the use of multidentate ligands, ideally tetra-or pentadentate ligands, is critical. Several kinds of multidentate ligands such as the PY5, [72][73][74][75][76][77] alkylamine-pyridine, [84][85][86][87][88][89]91,92,94,96 TAMLs, 90,97,[99][100][101][102][103][104][105] and porphyrins [119][120][121][122]124,[127][128][129][130][131] have been widely employed. Importantly, the ligands themselves need to be oxidation resistant.…”

“…Recently, Liao et al proposed another catalytic pathway of 20 based on DFT calculations. 88 They proposed two possible mechanisms for the O-O bond formation. The first involves the intramolecular coupling of the radical species similar to the mechanism proposed by Smith et al, and the other possible pathway is the WNA reaction of the Mn(IV)QO.…”

Soft X-ray signatures of cationic manganese–oxo systems, including a high-spin manganese(v) complex

“…[13][14][15][16][17][18][19] DFT calculations predict the formation of high-spin manganeseoxo species, typically in the form of a manganese(IV)-oxyl radical. [20][21][22][23] These predictions require experimental confirmation, not least because relative spin-state energetics and the amount of radical character depend on the density functional. [24][25][26] Partly inspired by the proposed role of manganese in the OEC, a large number of synthetic manganese(V)-oxo complexes with porphyrinoid or tetra-ionic macrocyclic ligands have been characterized.…”

Research on optimization method of process parameters for SiC components robotic bonnet polishing

“…Li et al 9 used magnetorheological technology to polish the 2m-diameter aspheric SiC mirror, and the surface roughness of the workpiece was reduced from λ/10 RMS to λ/50 RMS, but the polishing efficiency was low. Serrano et al 10 used CO 2 laser-assisted free abrasive polishing to polish SiC mirrors, which improved the polishing efficiency by 43% compared to the conventional polishing method but is currently available only for flat mirrors.…”