Clouding Behavior of C13EOx (x = 10–19) Micelles in a Wide Range of Salinity and Hardness

Concomitant Effects of Salinity and Degree of Ethoxylation

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Abstract

The effect of salinity and degree of ethoxylation on the cloud point, Tcp, in C13EOx (x = 10–19) micelles was investigated in distilled water and in the salinity range S = 1.96–196 g L−1. At a fixed x value, the rate dTcp/dS was given by dTcp/dS = αb + βbS with αb < 0 and βb > 0. This trend suggests that dTcp/dS is the result of two opposing effects, an entirely (negative) surfactant-dependent effect (αb) and a combined (positive) surfactant-solvent (βbS)-dependent effect. In addition, the rate dTcp/dS was found to become increasingly less negative with increasing salinity (dTcp/dS) < 0), suggesting an overwhelming contribution of the αb effect as compared to the βbS effect. On the other hand, at fixed S, the rate was given by dTcp/dx = αx + βxx with αx > 0 and βx < 0. This trend also suggests the existence of two opposing effects, a strictly (positive) solvent-dependent effect (αx) and a concomitant solvent (βx)-surfactant (x)-dependent effect. Contrary to dTcp/dS, the rate dTcp/dx was found to become increasingly less positive with increasing x values (dTcp/dx > 0), suggesting that αx is the dominant factor in the surfactants’ susceptibility to be salted in. Both constants αb and αx were attributed to a dual temperature-salinity effect on the structure of water molecules not involved in surfactant's hydration. On the other hand, βb and βx were associated with the change in the structure of water due to the dehydration of surfactants’ oxyethylene moieties with increasing temperature.

Original languageEnglish
JournalJournal of Surfactants and Detergents
DOIs
Publication statusAccepted/In press - Jan 1 2018

Fingerprint

Micelles
salinity
Surface-Active Agents
micelles
Surface active agents
hardness
Hardness
surfactants
Water
water
Dehydration
dehydration
Hydration
hydration
magnetic permeability
trends
Temperature
Molecules
temperature
molecules

Keywords

  • Cloud point
  • Hydrogen bonding
  • Nonionic surfactants
  • Salting-in effect
  • Salting-out effect
  • Solvent effect
  • Surfactant effect

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

Cite this

@article{093638090a4e443ab742d6d8c6c4862d,
title = "Clouding Behavior of C13EOx (x = 10–19) Micelles in a Wide Range of Salinity and Hardness: Concomitant Effects of Salinity and Degree of Ethoxylation",
abstract = "The effect of salinity and degree of ethoxylation on the cloud point, Tcp, in C13EOx (x = 10–19) micelles was investigated in distilled water and in the salinity range S = 1.96–196 g L−1. At a fixed x value, the rate dTcp/dS was given by dTcp/dS = αb + βbS with αb < 0 and βb > 0. This trend suggests that dTcp/dS is the result of two opposing effects, an entirely (negative) surfactant-dependent effect (αb) and a combined (positive) surfactant-solvent (βbS)-dependent effect. In addition, the rate dTcp/dS was found to become increasingly less negative with increasing salinity (dTcp/dS) < 0), suggesting an overwhelming contribution of the αb effect as compared to the βbS effect. On the other hand, at fixed S, the rate was given by dTcp/dx = αx + βxx with αx > 0 and βx < 0. This trend also suggests the existence of two opposing effects, a strictly (positive) solvent-dependent effect (αx) and a concomitant solvent (βx)-surfactant (x)-dependent effect. Contrary to dTcp/dS, the rate dTcp/dx was found to become increasingly less positive with increasing x values (dTcp/dx > 0), suggesting that αx is the dominant factor in the surfactants’ susceptibility to be salted in. Both constants αb and αx were attributed to a dual temperature-salinity effect on the structure of water molecules not involved in surfactant's hydration. On the other hand, βb and βx were associated with the change in the structure of water due to the dehydration of surfactants’ oxyethylene moieties with increasing temperature.",
keywords = "Cloud point, Hydrogen bonding, Nonionic surfactants, Salting-in effect, Salting-out effect, Solvent effect, Surfactant effect",
author = "Maissa Souayeh and Mohamed Aoudia and {Al Maamari}, Rashid",
year = "2018",
month = "1",
day = "1",
doi = "10.1002/jsde.12215",
language = "English",
journal = "Journal of Surfactants and Detergents",
issn = "1097-3958",
publisher = "Springer Verlag",

}

TY - JOUR

T1 - Clouding Behavior of C13EOx (x = 10–19) Micelles in a Wide Range of Salinity and Hardness

T2 - Concomitant Effects of Salinity and Degree of Ethoxylation

AU - Souayeh, Maissa

AU - Aoudia, Mohamed

AU - Al Maamari, Rashid

PY - 2018/1/1

Y1 - 2018/1/1

N2 - The effect of salinity and degree of ethoxylation on the cloud point, Tcp, in C13EOx (x = 10–19) micelles was investigated in distilled water and in the salinity range S = 1.96–196 g L−1. At a fixed x value, the rate dTcp/dS was given by dTcp/dS = αb + βbS with αb < 0 and βb > 0. This trend suggests that dTcp/dS is the result of two opposing effects, an entirely (negative) surfactant-dependent effect (αb) and a combined (positive) surfactant-solvent (βbS)-dependent effect. In addition, the rate dTcp/dS was found to become increasingly less negative with increasing salinity (dTcp/dS) < 0), suggesting an overwhelming contribution of the αb effect as compared to the βbS effect. On the other hand, at fixed S, the rate was given by dTcp/dx = αx + βxx with αx > 0 and βx < 0. This trend also suggests the existence of two opposing effects, a strictly (positive) solvent-dependent effect (αx) and a concomitant solvent (βx)-surfactant (x)-dependent effect. Contrary to dTcp/dS, the rate dTcp/dx was found to become increasingly less positive with increasing x values (dTcp/dx > 0), suggesting that αx is the dominant factor in the surfactants’ susceptibility to be salted in. Both constants αb and αx were attributed to a dual temperature-salinity effect on the structure of water molecules not involved in surfactant's hydration. On the other hand, βb and βx were associated with the change in the structure of water due to the dehydration of surfactants’ oxyethylene moieties with increasing temperature.

AB - The effect of salinity and degree of ethoxylation on the cloud point, Tcp, in C13EOx (x = 10–19) micelles was investigated in distilled water and in the salinity range S = 1.96–196 g L−1. At a fixed x value, the rate dTcp/dS was given by dTcp/dS = αb + βbS with αb < 0 and βb > 0. This trend suggests that dTcp/dS is the result of two opposing effects, an entirely (negative) surfactant-dependent effect (αb) and a combined (positive) surfactant-solvent (βbS)-dependent effect. In addition, the rate dTcp/dS was found to become increasingly less negative with increasing salinity (dTcp/dS) < 0), suggesting an overwhelming contribution of the αb effect as compared to the βbS effect. On the other hand, at fixed S, the rate was given by dTcp/dx = αx + βxx with αx > 0 and βx < 0. This trend also suggests the existence of two opposing effects, a strictly (positive) solvent-dependent effect (αx) and a concomitant solvent (βx)-surfactant (x)-dependent effect. Contrary to dTcp/dS, the rate dTcp/dx was found to become increasingly less positive with increasing x values (dTcp/dx > 0), suggesting that αx is the dominant factor in the surfactants’ susceptibility to be salted in. Both constants αb and αx were attributed to a dual temperature-salinity effect on the structure of water molecules not involved in surfactant's hydration. On the other hand, βb and βx were associated with the change in the structure of water due to the dehydration of surfactants’ oxyethylene moieties with increasing temperature.

KW - Cloud point

KW - Hydrogen bonding

KW - Nonionic surfactants

KW - Salting-in effect

KW - Salting-out effect

KW - Solvent effect

KW - Surfactant effect

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DO - 10.1002/jsde.12215

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JF - Journal of Surfactants and Detergents

SN - 1097-3958

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