Phase transformation in a nanostructured M300 maraging steel obtained by SPS of mechanically alloyed powders |
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| Authors: | C Menapace I Lonardelli A Molinari |
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| Institution: | (1) Faculty of Chemistry, Department of Inorganic Chemistry, University of Bucharest, 90-92 Panduri Str. Sector 5, 050663 Bucharest, Romania;(2) Faculty of Chemistry, Department of Analytical Chemistry, University of Bucharest, 90-92 Panduri Str. Sector 5, 050663 Bucharest, Romania;(3) Faculty of Biology, Department of Microbiology, University of Bucharest, 1-3 Aleea Portocalilor St., Sector 6, 060101 Bucharest, Romania |
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| Abstract: | New complexes of type Cu(HTBG)2]Cl2 (1), Cu(TBG)2]·3H2O (2) and CuL]·nH2O (3) L:L1, n = 2 and (4) L:L2, n = 1 (HTBG: 2-tolylbiguanide, L1 and L2: ligands resulted from 2-tolylbiguanide, ammonia/hydrazine and formaldehyde one pot condensation) were synthesised and characterised.
The features of complexes have been assigned from microanalytical, IR and UV–Vis data. Redox behaviour was established by
cyclic voltammetry. The in vitro qualitative and quantitative antimicrobial activity assays showed that the complexes exhibited
variable antimicrobial activity against Gram-negative and Gram-positive strains isolated from the hospital environment. The
thermal analyses have evidenced the thermal intervals of stability and also the thermodynamic effects that accompany them.
After water elimination, complexes have a similar thermal behaviour. Processes as water elimination, melting, chloride anion
removal as well as oxidative degradation of the organic ligands were observed. The final product of decomposition was copper
(II) oxide. |
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