Theory of ultrasonic absorption in micellar solutions

1979 ◽  
Vol 83 (22) ◽  
pp. 2917-2920 ◽  
Author(s):  
M. Teubner
Keyword(s):  
Micellar Solutions ◽  
Ultrasonic Absorption

Chemical Relaxations in Aqueous Micellar Solutions by Ultrasonic Spectroscopy. I. Alkali Metal Hexyl and Octyl Sulfates

1974 ◽  
Vol 52 (3) ◽  
pp. 429-433 ◽  
Author(s):  
Douglas A. W. Adair ◽  
Vincent C. Reinsborough ◽  
Nick Plavac ◽  
John P. Valleau
Keyword(s):  
Critical Micelle Concentration ◽  
Alkali Metal ◽  
Micelle Formation ◽  
Micellar Solutions ◽  
Ultrasonic Absorption ◽  
Ultrasonic Spectroscopy ◽  
Relaxation Data ◽  
Pulse Technique ◽  
Absorption Studies ◽  
Aqueous Micellar Solutions

Ultrasonic absorption studies have been performed in dilute micellar solutions of Li, Na, and K octylsulfates, Na methylhexylsulfate, and Na hexylsulfate at 40° by the pulse technique in the range 13–143 MHz. Chemical relaxations associated with micelle formation were found in each system. The single-valued relaxation frequencies were concentration independent in solutions as concentrated as twice the critical micelle concentration. The relaxation data can be accounted for in terms of monomer–micelle association–dissociation.

Théorie de l'absorption ultrasonore des solutions micellaires d'amphiphiles. Application à l'effet de la force ionique sur la dynamique d'échange d'amphiphiles entre micelles et solution environnante

1980 ◽  
Vol 58 (17) ◽  
pp. 1780-1787 ◽  
Author(s):  
R. Zana ◽  
S. Yiv
Keyword(s):  
Relaxation Time ◽  
Ionic Strength ◽  
Exchange Process ◽  
Relaxation Method ◽  
Quantitative Interpretation ◽  
Micellar Solutions ◽  
Ultrasonic Absorption ◽  
Micellar Systems ◽  
Ultrasonic Relaxation ◽  
Absorption Measurements

An expression for the amplitude of the ultrasonic relaxation arising from the exchange of amphiphiles between micelles and surrounding solution has been derived on the basis of the same assumptions as used by Aniansson and Wall to obtain the expression of the relaxation time for this process. The derived expression somewhat extends the range of investigation of micellar systems which can be performed by means of the ultrasonic relaxation method. It has been used for the quantitative interpretation of ultrasonic absorption measurements concerning the effect of ionic strength on the dynamics of the exchange process in micellar solutions of potassium decanoate.

Effect of cetyltrimethylammonium bromide on the electrochemiluminiscence and electrooxidation of luminol

1983 ◽  
Vol 48 (2) ◽  
pp. 477-483 ◽  
Author(s):  
Jan Lasovský ◽  
František Grambal
Keyword(s):  
Cetyltrimethylammonium Bromide ◽  
Linear Sweep Voltammetry ◽  
Critical Micellar Concentration ◽  
Peak Height ◽  
Anodic Peak ◽  
Alkaline Solutions ◽  
Platinum Electrodes ◽  
Micellar Solutions ◽  
Linear Sweep ◽  
Low Concentrations

The electrooxidation of luminol in alkaline solutions in the presence of cetyltrimethylammonium bromide (I) was studied by linear sweep voltammetry on fixed and vibrating platinum electrodes. The presence of I in low concentrations (below the critical micellar concentration) brings about aggregation of the luminol, which is manifested by an increase in the anodic peak height and its shift towards lower potentials. In micellar solutions the peak height decreases owing to the slower diffusion of the bulkier micelles, the shift to lower potentials being preserved. The light-voltage curves correspond with the voltammetric curves, exhibiting identical shifts of the peak potentials in dependence on the concentration of the surfactant.

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