• Keine Ergebnisse gefunden

The Effect of Anionic, Cationic and Nonionic Surfactants on the Uncatalyzed Bromate Oscillator

N/A
N/A
Info
Herunterladen
Protected

Academic year: 2022

Aktie "The Effect of Anionic, Cationic and Nonionic Surfactants on the Uncatalyzed Bromate Oscillator"

Copied!
1
0
0

Wird geladen.... (Jetzt Volltext ansehen)

Jetzt herunterladen ( 1 Seite )

Volltext

(1)

The Effect of Anionic, Cationic and Nonionic Surfactants on the Uncatalyzed Bromate Oscillator

Ol’ga Granˇciˇcov´a, Anna Olexov´a, and Tom´aˇs Zacher

Department of Physical and Theoretical Chemistry, Comenius University, Faculty of Natural Science, Mlynsk´a dolina, 842 15 Bratislava, Slovakia

Reprint requests to O. G.; E-mail: grancicova@fns.uniba.sk Z. Naturforsch.63a,475 – 481 (2008); received January 9, 2008

The response of an uncatalyzed bromate oscillator with phenol as substrate to the increasing con- centrations of cationic (CTAN), anionic (SDS) and nonionic surfactants (Brij-30 and Triton X-100) was monitored at(25±0.1)◦C under stirred batch conditions. Addition of the surfactants influenced the oscillatory parameters: a slight increase of the induction period of the first series of oscillations, a significant increase of the induction period of the second series of oscillations and a gradual decrease of the oscillation numbers of both series until complete disappearance at a certain surfactant concen- tration. The changes in the oscillatory parameters have been ascribed to solubilization of phenol and of bromination products in the micelles, to inhibition of bromination of the aromatic substrate due to bromine solubilization, and to the catalytic effect of the charged micelle surface.

Key words:Bromate Oscillator; Micelles; Sequential Oscillations.

Referenzen

Jetzt herunterladen ( PDF - 1 Seite - 25.39 KB )

ÄHNLICHE DOKUMENTE

The Increase in the Grassland Area of the Pays de Bray — erdkunde

surrounding plateaulands 28). 28) Documents of the ancien cadastre consulted at the Archives de la Direction des Contributions Directes at Rouen and Beauvais and

View of A History of the Present on the "Sportsman" and the "Sportswoman"

Several popular scientific texts or educational material were published during the 1990s, particularly by the Swedish Sports Confederation's own publishing company, SISU

Phase Behavior and Structural Transitions in The Mixtures of Cationic Surfactants and Hydrophobic Counterions

When an increasing amount of 2,1 HNC is introduced into a micellar solution of 100 mM CTAOH, one finds low viscous micellar solution, viscoelastic gel (consisting of rod

INVESTIGATION OF THE INFLUENCE OF THE WELDING SPEED AND CURRENT ON THE PARAMETERS OF THE ADAPTIVE FUNCTION

The heat flow problem in welding with various welding current and speed were solved by Rosenthal’s method, FEM, and the adaptive function method and the accuracy of

The Effect of Anionic, Cationic and Nonionic Surfactants on the Uncatalyzed Bromate Oscillator

Figure 3 shows the effect of increasing surfactant concentration (as an example nonionic Triton X-100 was chosen) on the number of first and second oscillations, induction periods

of the Magnetic Induction

However, mainly in astrophysics [2 – 4], space physics [5, 6], and plasma physics [7,8], there arises very often the problem of the motion of a charged particle when the intensity

The Profile of Intercohort Increase

What has been obtained so far is a combination of survivorship and births expressed by (2) to (S), where validity is confirmed by the ability t o reconstruct the

On the Determination of the Degree of a Polynomial

Pbtscher (1983) used simultaneous Lagrange multiplier statistics in order to test the parameters of ARMA models; he proved the strong consistency of his procedure