Elektronenspinresonanz in mechanisch aktivierten Festkörpern

Abstract

SiO2‐, α‐Al2O3‐, ZnO‐ und ZnS‐Pulver wurden mechanisch aktiviert, die ESR und die Thermolumineszenz untersucht und die Oberflächengrößen gemessen. Schwingmahlung erzeugt paramagnetische Zentren, die in Übereinstimmung mit Lumineszenz‐ und Temperverhalten als Farbzentren oder Radikale gedeutet werden können.

Adsorption and reaction of cyclohexene and 1-hexene on nascent gold surface formed by friction

“…Under boundary lubrication conditions, the surface layers on solids such as metal oxides and organic contaminant are removed by mechanical stimulation, resulting in the formation of nascent surfaces. There are many kinds of active sites on the nascent surfaces such as cation, anion, radical sites and defects [9][10][11][12][13]. Nascent surfaces are also obtained by vapor deposition and heat treatment in ultra-high vacuum (UHV).…”

A novel and facile synthesis of visible photoluminescence Si nanocrystals by room temperature mechanochemical disproportionation of SiO

“…Firstly, Si radicals and Si oxide radicals are generated by the application of mechanical stress during the high-energy planetary ball-milling, whose process should be similar to mechanochemical processing of quartz compounds. 23 The generation of radicals has been demonstrated as a main factor for mechanochemical reaction of mixed solid phases. 24,25 In addition, the generated Si radicals are stable in the inert atmosphere of argon gas.…”