Comparison of conventional and severe shot peening effects on the microstructure, texture, roughness, hardness, and electrochemical behavior of austenitic stainless steel.

In the present research, microstructure, texture, roughness, hardness, and electrochemical behavior of AISI 316L austenitic stainless steel before and after shot peening were studied to elucidate the effect of conventional and severe shot peening (CSP and SSP) processes. After the shot peening, the fraction of strain-induced martensite (SIM) and mechanical twins (MTs) in the sub-surface layer was increased. The fraction of SIM and MTs in the SSP sample was higher than in the CSP sample.

Micellar Catalysis: Bioinspired Micellar Copper Protoporphyrin as a High Performing Nano-Catalyst.

Herein we have engineered a micellar Cu protoporphyrin catalyst that mediates carbon bond activation using peroxide as an electron source. Cu protoporphyrin is a biomimetic model of active site of chloroperoxidase enzyme, which catalyzes the carbon bond halogenation in the presence of a suitable amount of HO. The encapsulation of Cu(II) Protoporphyrin IX/L-Cysteine inside of cetyltrimethylammonium bromide micelle increases the rate of chlorination at pH 3.

A bio-mimetic zinc/tau protein as an artificial catalase.

In this study, the catalase-like activity of monomeric tau protein was reported in the presence of of zinc (Zn(II)) ions at low pH value. Monomeric tau protein contains two SH groups that are a target of disulfide bond formation. However these SH groups are able to interact with Zn(II) ion at pH 7.