Solubility of amylose/ionic surfactant complexes in dilute aqueous solutions: Dependence on surfactant concentration

2007 ◽  
Vol 70 (3) ◽  
pp. 350-354 ◽  
Author(s):  
Maria Karlberg ◽  
Lennart Piculell ◽  
Lynga Huang
Keyword(s):  
Aqueous Solutions ◽  
Surfactant Concentration ◽  
Ionic Surfactant ◽  
Dilute Aqueous Solutions

scholarly journals Association between Nonionic Amphiphilic Polymer and Ionic Surfactant in Aqueous Solutions: Effect of Polymer Hydrophobicity and Micellization

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1831 ◽  
Author(s):  
Samhitha Kancharla ◽  
Nathan A. Zoyhofski ◽  
Lucas Bufalini ◽  
Boris F. Chatelais ◽  
Paschalis Alexandridis
Keyword(s):  
Ethylene Oxide ◽  
Aqueous Solutions ◽  
Surfactant Concentration ◽  
Sodium Dodecyl ◽  
Amphiphilic Polymers ◽  
Pluronic F127 ◽  
Ionic Surfactant ◽  
Pluronic P123 ◽  
Poly Ethylene Oxide ◽  
Poly Ethylene

The interaction in aqueous solutions of surfactants with amphiphilic polymers can be more complex than the surfactant interactions with homopolymers. Interactions between the common ionic surfactant sodium dodecyl sulfate (SDS) and nonionic amphiphilic polymers of the poly(ethylene oxide)–poly(propylene oxide)–poly(ethylene oxide) (PEO-PPO-PEO) type have been probed utilizing a variety of experimental techniques. The polymer amphiphiles studied here are Pluronic F127 (EO100PO65EO100) and Pluronic P123 (EO19PO69EO19), having the same length PPO block but different length PEO blocks and, accordingly, very different critical micellization concentrations (CMC). With increasing surfactant concentration in aqueous solutions of fixed polymer content, SDS interacts with unassociated PEO-PPO-PEO molecules to first form SDS-rich SDS/Pluronic assemblies and then free SDS micelles. SDS interacts with micellized PEO-PPO-PEO to form Pluronic-rich SDS/Pluronic assemblies, which upon further increase in surfactant concentration, break down and transition into SDS-rich SDS/Pluronic assemblies, followed by free SDS micelle formation. The SDS-rich SDS/Pluronic assemblies exhibit polyelectrolyte characteristics. The interactions and mode of association between nonionic macromolecular amphiphiles and short-chain ionic amphiphiles are affected by the polymer hydrophobicity and its concentration in the aqueous solution. For example, SDS binds to Pluronic F127 micelles at much lower concentrations (~0.01 mM) when compared to Pluronic P123 micelles (~1 mM). The critical association concentration (CAC) values of SDS in aqueous PEO-PPO-PEO solutions are much lower than CAC in aqueous PEO homopolymer solutions.

Ozonation of Non-Ionic Surfactants in Aqueous Solutions

1985 ◽  
Vol 17 (6-7) ◽  
pp. 1069-1080 ◽  
Author(s):  
Nava Narkis ◽  
Bella Ben-David ◽  
Malka Schneider Rotel
Keyword(s):  
Ethylene Oxide ◽  
Aqueous Solutions ◽  
Reaction Rate ◽  
Oxidation Mechanism ◽  
Ionic Surfactants ◽  
Ionic Surfactant ◽  
Nonyl Phenol ◽  
First Order ◽  
Reaction Rate Constants ◽  
Dilute Aqueous Solutions

The effect of ozone on dilute aqueous solutions of a series of non-ionic surfactants of nonyl phenol ethoxylates, with n=4 to 30 ethylene oxide groups, dinonyl phenol ethoxylate and a polyethylene glycol were investigated. Assuming ozone concentration in solution to remain constant throughout the ozonation, the experiments showed first-order reactions with respect to surfactant concentration, as measured by the Wickbold method, and also with respect to COD & TOC. A linear relationship was established between the first-order reaction rate constants, and between n, the average number of ethylene oxide groups in the ethoxylate chain of the nonyl phenol ethoxylate series. The oxidation mechanism by ozone of non-ionic surfactant molecules is explained as mainly polyethoxylate chains' cleavage into shorter polyethylene glycols and to a smaller extent oxidation of the aromatic ring. High ozone doses do not convert the non-ionic surfactant completely to CO2 and H2O but smaller doses are sufficient to enhance biodegradation.

The reactions of oligoalcohols with arsenic, arsenous, boric and germanic acids

1980 ◽  
Vol 45 (10) ◽  
pp. 2645-2655 ◽  
Author(s):  
Antonín Mikan ◽  
Miloš Bartušek
Keyword(s):  
Aqueous Solutions ◽  
Equilibrium Constants ◽  
Dilute Aqueous Solutions

The reactions of sorbitol, mannitol, adonitol, dulcitol, glucose and glycerol with H3AsO4, H3AsO3, H3BO3 and GeO2 acids in dilute aqueous solutions were studied by potentiometric neutralization titrations. The formation of the following chelates was demonstrated: As(V)L3-, As(III)L(OH)2-, HAs(III)L(OH)2, BL2-, GeL2(OH)- and GeL32- and the equilibrium constants for their formation were found. Conditions for formation of these chelates of organic oligohydroxy compounds are discussed.

Study of potential oscillations during reaction of an aluminium single crystal with an aqueous KOH solution

1990 ◽  
Vol 55 (2) ◽  
pp. 345-353 ◽  
Author(s):  
Ivan Halaša ◽  
Milica Miadoková
Keyword(s):  
Aqueous Solutions ◽  
Single Crystal ◽  
Single Crystals ◽  
Periodic Potential ◽  
Optimum Conditions ◽  
Potential Oscillations ◽  
Dilute Aqueous Solutions ◽  
Experimental Findings ◽  
Kinetics Of

The authors investigated periodic potential changes measured on oriented sections of Al single crystals during spontaneous dissolution in dilute aqueous solutions of KOH, with the aim to find optimum conditions for the formation of potential oscillations. It was found that this phenomenon is related with the kinetics of the reaction investigated, whose rate also changed periodically. The mechanism of the oscillations is discussed in view of the experimental findings.

A tensammetric study of polyacrylamides, including their determination

1988 ◽  
Vol 66 (10) ◽  
pp. 2658-2663 ◽  
Author(s):  
Truis Smith-Palmer ◽  
Byron R. Wentzell ◽  
John C. Donini ◽  
Robert J. Jerrard
Keyword(s):  
Aqueous Solutions ◽  
Limits Of Detection ◽  
Dilute Aqueous Solutions ◽  
Phase Sensitive

Phase-sensitive tensammetry is shown to be a convenient and useful way to analyse polyacrylamides and associated derivatives (pams) in dilute aqueous solutions. Standard curves were obtained with ranges varying from 9 to 25 ppm and limits of detection varying from 0.7 to 2 ppm. Ways to change the range and sensitivity are discussed and demonstrated. Typical interferences and their effects are tabulated, and the analysis of pams in coal washings is discussed. The analysis of certain mixtures of polyacrylamides is shown to be possible.

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