Ultrasonic Absorption Spectra in Aqueous Solutions of Alkylamines. Effect of Isotopic Solvents on Kinetics of Hydrolysis and Aggregation Reactions

2000 ◽  
Vol 104 (25) ◽  
pp. 5910-5915 ◽  
Author(s):  
Hua Huang ◽  
Sadakatsu Nishikawa
Keyword(s):  
Aqueous Solutions ◽  
Absorption Spectra ◽  
Ultrasonic Absorption ◽  
Kinetics Of Hydrolysis ◽  
Kinetics Of

Kinetics of hydrolysis of bromine in aqueous solutions of chloride and bromide ions

1977 ◽  
Vol 26 (8) ◽  
pp. 1571-1575
Author(s):  
A. G. Ivanchenko ◽  
M. N. Vargaftik ◽  
L. A. Katsman ◽  
V. I. Ksenzenko ◽  
S. M. Gutiontov
Keyword(s):  
Aqueous Solutions ◽  
Kinetics Of Hydrolysis ◽  
Bromide Ions ◽  
Kinetics Of ◽  
Hydrolysis Of

Notizen: Pulse Radiolysis of Selenium Containing Compounds: Selenomethionine

1974 ◽  
Vol 29 (7-8) ◽  
pp. 571-572 ◽  
Author(s):  
Maurizio Tamba ◽  
Sergio Bonora ◽  
Roberto Badiello
Keyword(s):  
Optical Absorption ◽  
Aqueous Solutions ◽  
Absorption Spectra ◽  
Pulse Radiolysis ◽  
Oh Radicals ◽  
Optical Absorption Spectra ◽  
Transient Species ◽  
Decay Kinetics ◽  
Kinetics Of

The pulse radiolysis of aqueous solutions of selenomethionine has been studied under both neutral and acid conditions and the transient optical absorption spectra have been observed. The reactivities of both eāq and OH radicals have been measured as well as the formation and the decay kinetics of the transient species.

Voltametric study of chlorine using a rotating gold disc electrode

1988 ◽  
Vol 53 (3) ◽  
pp. 487-496
Author(s):  
Přemysl Beran ◽  
Karel Micka ◽  
Vu Thi Gái
Keyword(s):  
Reaction Mechanism ◽  
Aqueous Solutions ◽  
Hypochlorous Acid ◽  
Acetate Buffer ◽  
Disc Electrode ◽  
Voltammetric Method ◽  
Kinetics Of Hydrolysis ◽  
Kinetics Of ◽  
Hydrolysis Of

The kinetics of hydrolysis of chlorine in acidic aqueous solutions was studied by the voltammetric method using a rotating gold disc electrode. The voltammetric curves consist of two waves, of which the more negative corresponds to reduction of hypochlorous acid and the more positive to reduction of chlorine. The wave of chlorine increases with the concentration of H+ and Cl- ions and has a kinetic character; in acetate buffer (pH 3.6) its behaviour approaches best the theory of kinetic-controlled waves. The corresponding dependences on the concentrations of H+ and Cl- ions, however, show some anomalies suggesting complications in the reaction mechanism.

Kinetics of Hydrolysis of an Activated Phosphate Ester in Brij35 Micelle Containing a Macrocyclic Complex of Cu(II) OR Ni(II)

2008 ◽  
Vol 33 (4) ◽  
pp. 349-361 ◽  
Author(s):  
Zhang Yi ◽  
Xie Jia-qing ◽  
Li Ci ◽  
Shang Hong-li ◽  
Wang Min
Keyword(s):  
Mathematical Model ◽  
Nucleophilic Substitution ◽  
Absorption Spectra ◽  
Macrocyclic Complex ◽  
Phosphate Ester ◽  
Specific Absorption ◽  
Intramolecular Nucleophilic Substitution ◽  
Kinetics Of Hydrolysis ◽  
Kinetics Of ◽  
Hydrolysis Of

A macrocyclic ligand and its corresponding Cu(II) and Ni(II) complexes were synthesized and characterized. The kinetics of hydrolysis of bis( p-nitrophenyl) phosphate (BNPP, an activated phosphate diester) in Brij35 micelle containing each macrocyclic complex was investigated. The metallomicelles made up of the macrocyclic metal complex and micelle, as a mimic hydrolytic metalloenzyme, display higher catalytic activity although they do not attain the catalytic efficiency of enzymes. The analysis of specific absorption spectra show that the course of the catalytic BNPP reaction is different from that of the spontaneous hydrolysis of BNPP, and is an intramolecular nucleophilic substitution reaction. Based on the analytical results of the specific absorption spectra, an intramolecular nucleophilic substitution mechanism for the catalytic hydrolysis of BNPP is proposed, a correlative kinetic mathematical model is established, and the corresponding thermodynamic and kinetic constants are calculated. The validity of the mechanism and the proposed mathematical model is confirmed by the results of this study.

Kinetics of hydrolysis of chloroform and bromoform in aqueous solutions

Desalination ◽  
1998 ◽  
Vol 120 (1-2) ◽  
pp. 41-51 ◽  
Author(s):  
A.M. Shams El Din ◽  
Rasheed A. Arain ◽  
A.A. Hammoud
Keyword(s):  
Aqueous Solutions ◽  
Kinetics Of Hydrolysis ◽  
Kinetics Of ◽  
Hydrolysis Of

Reduction Kinetics of Thermally Reduced Graphene Oxide Thin Films

2015 ◽  
Vol 827 ◽  
pp. 317-320 ◽  
Author(s):  
Fitrilawati ◽  
Norman Syakir ◽  
Annisa Aprilia ◽  
Zhou Yang Liu ◽  
Xin Liang Feng ◽  
...  
Keyword(s):  
Thin Films ◽  
Graphene Oxide ◽  
Aqueous Solutions ◽  
Reduced Graphene Oxide ◽  
Absorption Spectra ◽  
Thermal Reduction ◽  
Reduction Kinetics ◽  
Glass Substrates ◽  
Reduced Graphene ◽  
Kinetics Of

We report an experimentalstudy of thermal reduction of graphene oxide (GO) under nitrogen flow.Ultrathin films of GO were prepared on quartz glass substrates by spin-coatingfrom 3 mg/ml aqueous solutions of GO. These films were annealed at 50 °C under vacuum overnight before thermal reduction.The films were exposed to temperatures of 100 °C, 150 °C, 200 °C, 300 °C, 400 °C, 500 °C and 800 °C under nitrogen flowing. We used UV-Vis absorption spectroscopy tomonitor the change of absorption spectra caused by thermal reduction. We observed a significant change ofabsorption spectra due to formation of reduced graphene oxide (RGO). We found that thermal reduction startedalready at 100 °C, but proceeded significantly faster at heating temperatures higherthan 200 °C.

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