Fluorescence measurements of peroxynitrite/peroxynitrous acid in cold air plasma treated aqueous solutions

2019 ◽  
Vol 21 (17) ◽  
pp. 8883-8896 ◽  
Author(s):  
Barbora Tarabová ◽  
Petr Lukeš ◽  
Malte U. Hammer ◽  
Helena Jablonowski ◽  
Thomas von Woedtke ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Chemical Kinetics ◽  
Fluorescence Detection ◽  
Peroxynitrous Acid ◽  
Air Plasma ◽  
Cold Air ◽  
Fluorescence Measurements ◽  
Direct Fluorescence ◽  
Kinetics Of

The first study providing direct fluorescence detection of peroxynitrite/peroxynitrous acid (ONOO−/ONOOH) in plasma activated liquids correlated with the chemical kinetics of ONOOH formation.

Mixed micelles of poly(styrene-b-3-(methacryloylamino)propyltrimethylammonium chloride-b-ethylene oxide) and anionic amphiphiles in aqueous solutions

2010 ◽  
Vol 88 (3) ◽  
pp. 208-216 ◽  
Author(s):  
Jingjing Liu ◽  
Airi Yoneda ◽  
Dian Liu ◽  
Yuuichi Yokoyama ◽  
Shin-ichi Yusa ◽  
...  
Keyword(s):  
Ethylene Oxide ◽  
Aqueous Solutions ◽  
Mixed Micelles ◽  
Organic Dyes ◽  
Sodium Dodecyl ◽  
Degree Of Polymerization ◽  
Hydrodynamic Diameter ◽  
Low Concentration ◽  
Fluorescence Measurements ◽  
Kinetics Of

The micelles of poly(styrene-b-3-(methacryloylamino)propyltrimethylammonium chloride-b-ethylene oxide) (PS-b-PMAPTAC-b-PEO) have been successfully prepared in aqueous solutions. The micelles have a PS core, cationic PMAPTAC shell, and PEO corona. Due to the short PS chain (degree of polymerization = 8), the formation of micelles is difficult at a low concentration, and the micelles are detected only at concentrations higher than 1 g L–1. The addition of anionic amphiphiles, such as sodium dodecyl sulfate (SDS) and poly(methacrylic acid) (PMAA), induces the formation of mixed micelles at a low concentration level of the polymer (~0.005 g L–1). This can be ascribed to insolubilization of the cationic PMAPTAC block due to charge neutralization by the anionic amphiphiles. The binding of SDS or PMAA to the PMAPTAC block is confirmed by zeta-potential measurements. The mixed micelles are characterized by dynamic light scattering (DLS), scanning electron microscopy (SEM), and fluorescence measurements. Based on DLS measurements, it is revealed that the hydrodynamic diameter of the mixed micelles falls in the range of 120–130 nm. SEM measurements provided clear pictures of mixed micelles with a spherical morphology. The kinetics of exchange of organic dyes between the micelle particles was investigated by fluorescence techniques. The result indicates that the exchange of the dyes between the micelle particles takes places within a time scale of seconds.

Chemical kinetics of calcium hypochlorite decomposition in aqueous solutions

2009 ◽  
Vol 16 (3) ◽  
pp. 21-25 ◽  
Author(s):  
Yee San Su ◽  
Delmar “Trey” Morrison ◽  
Russell A. Ogle
Keyword(s):  
Aqueous Solutions ◽  
Chemical Kinetics ◽  
Calcium Hypochlorite ◽  
Kinetics Of

Ultrasonic Relaxation and Fast Chemical Kinetics of Some Carbohydrate Aqueous Solutions

1997 ◽  
Vol 119 (9) ◽  
pp. 2182-2186 ◽  
Author(s):  
Ralph Behrends ◽  
Mary K. Cowman ◽  
Frieder Eggers ◽  
Edward M. Eyring ◽  
Udo Kaatze ◽  
...  
Keyword(s):  
Aqueous Solutions ◽  
Chemical Kinetics ◽  
Ultrasonic Relaxation ◽  
Kinetics Of ◽  
Fast Chemical

Effects of salts on the kinetics of oxidation of alkenes by thallic salts in aqueous solutions

1981 ◽  
Vol 46 (3) ◽  
pp. 693-700 ◽  
Author(s):  
Milan Strašák ◽  
Jaroslav Majer
Keyword(s):  
Aqueous Solutions ◽  
Phase Transfer ◽  
Heterogeneous Reaction ◽  
Qualitative Model ◽  
Kinetic Effect ◽  
Tetraalkylammonium Salts ◽  
Reaction Conditions ◽  
Kinetics Of Oxidation ◽  
Kinetics Of ◽  
Heterogeneous Reaction Conditions

The kinetics of oxidation of alkenes by thallic sulphate in aqueous solutions, involving the two reaction steps-the hydroxythallation and the dethallation - was studied, and the effect of salts on the kinetics was examined; this made it possible to specify more precisely the reaction mechanism and to suggest a qualitative model of the reaction coordinate. It was found that in homogeneous as well as in heterogeneous reaction conditions, the reaction can be accelerated appreciably by adding tetraalkylammonium salts. These salts not only operate as catalysts of the phase transfer, but also exert a significant kinetic effect, which can be explained with a simplification in terms of a stabilization of the transition state of the reaction.

Sign in / Sign up

Export Citation Format

Share Document