The optimization of a fuel cell performance involves the prediction its operation conditions and electrochemical properties for short long-time periods. One topics not studied in detail is influence change surface roughness morphology metallic catalytic layers on working conditions. For platinum anodic catalysts columnar growth was demonstrated after 1 month hydrogen/oxygen continuous at A cm?2...

Objective(s): One of the main constraints of collagen hydrogel scaffolds for using in tissue engineering is mechanical weakness. Plastic compression (PC) is a physical method to overcome the mechanical limitation of collagen hydrogel. Materials and Methods: In this study, the effects of pH on mechanical and biological properties of PC hydrogels were investigated. Collagen hydrogels were fabrica...

Multijunction solar cells must be electrically isolated from one to another at the end of fabrication process; a step known as mesa isolation. In this study, three different techniques are assessed perform step: saw-dicing, wet etching and plasma etching. Triple junction were fabricated with each process open-circuit voltages measured in order compare impact technique on device performance. An ...