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AFM studies of pits formation on KBr(1 0 0) during its dissolution by water

Pers J., Barwiński B., Grodzicki M., Ciszewski A.

Materials Science Poland

2016

Vol. 34, No. 4

863--867

The formation of etch pits along screw dislocations on KBr(1 0 0) surface during its dissolution by water is investigated by means of atomic force microscopy (AFM). Clean KBr(1 0 0) is obtained by cleavage. A weak solution of water in isopropyl alcohol is used to investigate the etching in real time. Observations of the etch pit evolution with etching time show that concentration of atomic steps on the pit walls and dissolution rate of the walls vary up to complete dissolution of the screw dislocation. The screw dislocation removal stabilizes the dissolution, resulting in constant values of atomic steps concentration on the pit walls and their dissolution rate during further etching, which continues according to the crystal dissolution stepwave model. It was found that the movement of AFM scanning tip essentially affected the etching process.

Bromine catalyst for the methane to methyl bisulfate reaction

Michalkiewicz B., Balcer S.

Polish Journal of Chemical Technology

2012

Vol. 14, nr 4

19-21

A catalytic system KBr – oleum is effective at catalyzing the selective oxidation of methane to methanol via. methyl bisulfate. The infl uences of methane pressure, sulfur trioxide and temperature on turnover frequency were investigated.