The Experts below are selected from a list of 54 Experts worldwide ranked by ideXlab platform

K F Khaled - One of the best experts on this subject based on the ideXlab platform.

  • experimental and atomistic simulation studies of corrosion inhibition of copper by a new Benzotriazole Derivative in acid medium
    Electrochimica Acta, 2009
    Co-Authors: K F Khaled
    Abstract:

    Abstract The efficiency of N-(2-thiazolyl)-1H-Benzotriazole-1-carbothioamide (TBC) as a non-toxic corrosion inhibitor for copper in 0.5 M HCl has been tested by weight loss and electrochemical techniques. Electrochemical techniques show that TBC is a mixed-type inhibitor and its inhibition mechanism on copper surface is adsorption assisted by H-bond formation. Impedance measurements show a wide peak presumably given by more than one time constant in the presence of TBC. Also, impedance results show that the values of CPEs (constant phase elements) tend to decrease and both polarization resistance and inhibition efficiency tend to increase with increasing of TBC concentration due to an increase in the electric double layer. Monte Carlo simulations incorporating molecular mechanics and molecular dynamics show that the TBC adsorb on the copper surface firmly through the thiazolyl and carbothioamide groups, the adsorption energy as well as hydrogen bond length have been calculated for both TBC and Benzotriazole (BTA) for comparison. Quantum chemical calculations reveal that TBC has higher HOMO, lower LUMO, lower energy gap and lower dipole moment ( μ ) than BTA, which proves that TBC is better copper corrosion inhibitor compared with BTA in 0.5 M HCl.

Dal M Colle - One of the best experts on this subject based on the ideXlab platform.

  • on the protective action of 1 2 3 Benzotriazole Derivative films against copper corrosion
    Corrosion Science, 1997
    Co-Authors: L Tommesani, G Brunoro, A Frignani, C Monticelli, Dal M Colle
    Abstract:

    The inhibiting effects of 1,2,3-Benzotriazole (BTA), 5-methyl-BTA (Cl-BTA), 5-butyl-BTA (C4-BTA), 5-hexyl-BTA (C6-BTA) and 5-dodecyl-BTA (C12-BTA) films on the corrosion of copper in 3.5% NaCl (pH = 7 and 2.5) and 0. 1 m NaClO4 (pH = 7) were evaluated from polarization curves and EIS spectra. The characteristics of the inhibitor films were investigated by means of wetting tests and XPS analysis. The tested compounds (almost insoluble C12-BTA excepted) produce films able to inhibit the oxygen reduction process depending on the alkyl chain length, but only C6-BTA film succeeds in hindering the copper oxidation reaction, even in acid NaCl. The protective action expecially exerted by the C6-BTA film should be related to the hydrophobic effect of the alkyl chain, rather than to an electron releasing inductive stabilisation effect.

L Tommesani - One of the best experts on this subject based on the ideXlab platform.

  • on the protective action of 1 2 3 Benzotriazole Derivative films against copper corrosion
    Corrosion Science, 1997
    Co-Authors: L Tommesani, G Brunoro, A Frignani, C Monticelli, Dal M Colle
    Abstract:

    The inhibiting effects of 1,2,3-Benzotriazole (BTA), 5-methyl-BTA (Cl-BTA), 5-butyl-BTA (C4-BTA), 5-hexyl-BTA (C6-BTA) and 5-dodecyl-BTA (C12-BTA) films on the corrosion of copper in 3.5% NaCl (pH = 7 and 2.5) and 0. 1 m NaClO4 (pH = 7) were evaluated from polarization curves and EIS spectra. The characteristics of the inhibitor films were investigated by means of wetting tests and XPS analysis. The tested compounds (almost insoluble C12-BTA excepted) produce films able to inhibit the oxygen reduction process depending on the alkyl chain length, but only C6-BTA film succeeds in hindering the copper oxidation reaction, even in acid NaCl. The protective action expecially exerted by the C6-BTA film should be related to the hydrophobic effect of the alkyl chain, rather than to an electron releasing inductive stabilisation effect.

Mark Hernandez - One of the best experts on this subject based on the ideXlab platform.

  • Toxicity of Benzotriazole and Benzotriazole Derivatives to three aquatic species.
    Water Research, 2001
    Co-Authors: David A. Pillard, Jeffrey S. Cornell, Doree L. Dufresne, Mark Hernandez
    Abstract:

    Benzotriazole and its Derivatives comprise an important class of corrosion inhibitors, typically used as trace additives in industrial chemical mixtures such as coolants, deicers, surface coatings, cutting fluids, and hydraulic fluids. Recent studies have shown that Benzotriazole Derivatives are a major component of aircraft deicing fluids (ADFs) responsible for toxicity to bacteria (Microtox). Our current research compared the toxicity of Benzotriazole (BT), two methylBenzotriazole (MeBT) isomers, and butylBenzotriazole (BBT). Acute toxicity assays were used to model the response of three common test organisms: Microtox bacteria (Vibrio fischeri), fathead minnow (Pimephales promelas) and water flea (Ceriodaphnia dubia). The response of all the three organisms varied over two orders of magnitude among all compounds. Vibrio fischeri was more sensitive than either C. dubia or P. promelas to all the test materials, while C. dubia was less sensitive than P. promelas. The response of test organisms to unmethylated Benzotriazole and 4-methylBenzotriazole was similar, whereas 5-methylBenzotriazole was more toxic than either of these two compounds. BBT was the most toxic Benzotriazole Derivative tested, inducing acute toxicity at a concentration of < or = 3.3 mg/l to all organisms.

Andrei I Khlebnikov - One of the best experts on this subject based on the ideXlab platform.

  • Synthesis and oxidation of some azole-containing thioethers
    Beilstein Journal of Organic Chemistry, 2011
    Co-Authors: Andrei S Potapov, Nina P. Chernova, Vladimir D. Ogorodnikov, Tatiana V Petrenko, Andrei I Khlebnikov
    Abstract:

    : Pyrazole and Benzotriazole-containing thioethers, namely 1,5-bis(3,5-dimethylpyrazol-1-yl)-3-thiapentane, 1,8-bis(3,5-dimethylpyrazol-1-yl)-3,6-dithiaoctane and 1,3-bis(1,2,3-benzotriazol-1-yl)-2-thiapropane were prepared and fully characterized. Oxidation of the pyrazole-containing thioether by hydrogen peroxide proceeds selectively to provide a sulfoxide or sulfone, depending on the amount of oxidant used. Oxidation of the Benzotriazole Derivative by hydrogen peroxide is not selective, and sulfoxide and sulfone form concurrently. Selenium dioxide-catalyzed oxidation of Benzotriazole thioether by H(2)O(2), however, proceeds selectively and yields sulfoxide only.