Results 251 to 260 of about 32,605 (302)

Activity of Nonionic Surfactants

Russian Journal of Applied Chemistry, 2001
The surface activity of block copolymers of ethylene and propylene oxides, based on ethylenediamine, mono(ethylene glycol), and triethanolamine, was studied. Adsorption characteristics of the investigated compounds at the water-air interface are estimated.
B. R. Fakhrutdinov, O. A. Varnavskaya, L. K. Khvatova, N. A. Lebedev, I. N. Diyarov, R. Z. Fakhrutdinov   +5 more
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Dissolution Rates of Pure Nonionic Surfactants

Langmuir, 2000
no ...
Chen, B. H., Miller, C. A., Walsh, J. M., Warren, P. B., Ruddock, J. N., Garrett, P. R., Argoul, Françoise, Léger, Christophe   +7 more
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Nonionic surfactants in cylindrical hydrophilic pores

Progress in Colloid & Polymer Science, 1997
A mean field lattice (MFL) theory has been used to study the adsorption behaviour of nonionic surfactants in hydrophilic cylindrical pores. The theory predicts that with decreasing pore radius the absorbed amount decreases. Moreover, the step in the adsorption isotherm, which is a first-order phase transition in the mean field approximation, shifts to ...
Huinink, H.P., de Keizer, A., Leermakers, F.A.M., Lyklema, J.   +3 more
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Interfaces Charged by a Nonionic Surfactant

The Journal of Physical Chemistry B, 2018
Highly hydrophobic, water-insoluble nonionic surfactants are often considered irrelevant to the ionization of interfaces at which they adsorb, despite observations that suggest otherwise. In the present study, we provide unambiguous evidence for the participation of a water-insoluble surfactant in interfacial ionization by conducting electrophoresis ...
Joohyung Lee, Zhang-Lin Zhou, Sven Holger Behrens   +2 more
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Oxidation of Self-Organized Nonionic Surfactants

Langmuir, 2004
Nonionic surfactants containing a polyoxyethylene headgroup are known to slowly undergo oxidative degradation when exposed to air. The oxidation, which starts by abstraction of a hydrogen atom from a methylene group in alpha-position to an ether oxygen, is accelerated by metal ions.
Fredrik, Currie, Martin, Andersson, Krister, Holmberg   +2 more
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Chapter 4 | Nonionic Surfactants

2021
This chapter describes nonionic surfactants, their synthesis, and applications. This group of surfactants is one of the largest with respect to use. Most nonionics are produced by alkylation of hydroxyl compounds (e.g., fatty alcohols and alkylphenols, fatty amines, and polyhydric alcohols), such as glycol, glycerol, and carbohydrates (sugars).
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Nonionic surfactant effects on pentachlorophenol biodegradation

Water Research, 2002
Several potential mechanisms of surfactant-induced inhibition of pentachlorophenol (PCP) biodegradation were tested using a pure bacterial culture of Sphingomonas chlorophenolicum sp. Strain RA2. PCP degradation, glucose degradation, and oxygen uptake during endogenous conditions and during glucose degradation were measured for batch systems in the ...
Todd L, Cort, Myoung-Suk, Song, Angela R, Bielefeldt   +2 more
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QSPR for Nonionic Surfactants

Journal of Dispersion Science and Technology, 2007
A quantitative structure property relationship; QSPR was preformed as a means to predict critical micelle concentration of nonionic surfactants via correlating properties to parameters calculated from molecular structure. Such parameters; molecular weight, M w , hydrophobic‐hydrophilic fragments molecular weight ratio, χ, polarizability, α, partition ...
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Dissolution of nonionic surfactant mixtures

Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2001
Abstract Videomicroscopy was used to observe dissolution in water of drops of neat commercial nonionic surfactants and mixtures of pure nonionic surfactants. The time required for complete dissolution of such drops was greater at temperatures slightly below their cloud points than at lower temperatures, in contrast to behavior found for pure nonionic
Bing-Hung Chen, Clarence A Miller, Peter R Garrett   +2 more
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Bending Elasticity of Nonionic Surfactant Layers

Langmuir, 2009
A novel approach to evaluate the bending elasticity of monolayers formed by nonionic surfactants with a rigid head group is introduced by means of considering head group repulsion as derived from the free energy of mixing rigid hydrophilic head groups with surrounding solvent molecules as well as contributions related to the hydrophobic tails. Explicit
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