Chemical relaxations in micellar solutions by ultrasonic spectroscopy. II. Sodium heptylsulfate and hexylammonium chloride solutions

1976 ◽  
Vol 54 (7) ◽  
pp. 1162-1167 ◽  
Author(s):  
Douglas A. W. Adair ◽  
Vincent C. Reinsborough ◽  
Hayden M. Trenholm ◽  
John P. Valleau
Keyword(s):  
Relaxation Behaviour ◽  
Micellar Solutions ◽  
Ultrasonic Spectroscopy ◽  
Pulse Technique ◽  
Chloride Solutions

Ultrasonic absorptions have been measured by the pulse technique for the dilute and concentrated micellar range for Na heptylsulfate and hexylammonium chloride solutions. The dilute micellar range was also investigated for the Li, K, Rb, and Cs heptylsulfate systems. Single-valued relaxations were found in each system. The relaxation frequencies increased linearly with concentration in the concentrated micellar range but in the dilute range were relatively constant. The relaxation behaviour was interpreted in terms of monomer exchange between micelles.

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.

Ultrasonic spectroscopy in nonionic micellar solutions far from and near toTc

1994 ◽  
Vol 50 (6) ◽  
pp. 4817-4826 ◽  
Author(s):  
G. D’Arrigo ◽  
A. Paparelli
Keyword(s):  
Micellar Solutions ◽  
Ultrasonic Spectroscopy

Ultrasonic spectroscopy of liquids. Extending the frequency range of the variable sample length pulse technique

1993 ◽  
Vol 4 (11) ◽  
pp. 1257-1265 ◽  
Author(s):  
U Kaatze ◽  
V Kuhnel ◽  
K Menzel ◽  
S Schwerdtfeger
Keyword(s):  
Sample Length ◽  
Frequency Range ◽  
Ultrasonic Spectroscopy ◽  
Pulse Technique

Mechanistic Aspects of Pit Growth on Nickel in Diluted Chloride Solutions

CORROSION ◽  
1985 ◽  
Vol 41 (12) ◽  
pp. 715-719 ◽  
Author(s):  
P. Heimgartner ◽  
H. Bohni
Keyword(s):  
Charge Transfer ◽  
Transition Time ◽  
Dissolution Mechanism ◽  
Current Response ◽  
Applied Potential ◽  
Pulse Technique ◽  
Chloride Solutions ◽  
Diffusion Controlled ◽  
Current Densities ◽  
Dependent Mechanism

Abstract Pit current densities (CDs) in small pits have been found to be potential dependent, indicating an ohmic or mixed ohmic-charge transfer controlled dissolution mechanism. In a later stage of pit growth, a diffusion-controlled dissolution has often been reported. The potential-dependent mechanism is not always restricted to only the beginning of pit development, as has been shown in galvanostatic tests with rather low CDs. In this paper, the mechanism change from ohmic-charge transfer to diffusion-controlled pit growth was also studied in potentiostatic experiments by means of potential pulses added to the applied potential. The current response to fast potential changes differs for the two mechanisms. The influence of a number of parameters [such as potential, position of the specimen (horizontal or vertical), agitation of the bulk electrolyte, and pit diameter] on the transition time for mechanism change could be investigated using this pulse technique. Results also show that the rate law for pit growth can be very similar for the two types of mechanisms and different pit geometry (artificial pits of the wire type or “naturally” growing pits).

Ultrasonic Spectroscopy

2017 ◽  
Author(s):  
Robert G. Leisure
Keyword(s):  
Ultrasonic Spectroscopy

Non-Destructive Testing of Thermoplastic Carbon Composite Structures

2020 ◽  
Vol 2020 (1) ◽  
pp. 34-52
Author(s):  
Rafał Szymański
Keyword(s):  
Composite Structures ◽  
Ultrasonic Method ◽  
Composite Panel ◽  
Aviation Industry ◽  
Non Destructive Testing ◽  
Destructive Testing ◽  
Pulse Technique ◽  
Thermoplastic Matrix ◽  
The Subject ◽  
Non Destructive

AbstractThe article is in line with the contemporary interests of companies from the aviation industry. It describes thermoplastic material and inspection techniques used in leading aviation companies. The subject matter of non-destructive testing currently used in aircraft inspections of composite structures is approximated and each of the methods used is briefly described. The characteristics of carbon preimpregnates in thermoplastic matrix are also presented, as well as types of thermoplastic materials and examples of their application in surface ship construction. The advantages, disadvantages and limitations for these materials are listed. The focus was put on the explanation of the ultrasonic method, which is the most commonly used method during the inspection of composite structures at the production and exploitation stage. Describing the ultrasonic method, the focus was put on echo pulse technique and the use of modern Phased Array heads. Incompatibilities most frequently occurring and detected in composite materials with thermosetting and thermoplastic matrix were listed and described. A thermoplastic flat composite panel made of carbon pre-impregnate in a high-temperature matrix (over 300°C), which was the subject of the study, was described. The results of non-destructive testing (ultrasonic method) of thermoplastic panel were presented and conclusions were drawn.

Ultrasonic Spectroscopy of Silicon Single Crystal

2011 ◽  
Vol 18 (4) ◽  
Author(s):  
Petr Sedlak ◽  
Pavel Tofel ◽  
Vlasta Sedlakova ◽  
Jiri Majzner ◽  
Josef Sikula ◽  
...  
Keyword(s):  
Single Crystal ◽  
Silicon Single Crystal ◽  
Ultrasonic Spectroscopy
Sign in / Sign up

Export Citation Format

Share Document