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Oxidation of Self-Organized Nonionic Surfactants
Langmuir, 2004Nonionic 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 +2 more
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Chapter 4 | Nonionic Surfactants
2021This 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, 2002Several 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 +2 more
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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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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, 2001Abstract 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 +2 more
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Bending Elasticity of Nonionic Surfactant Layers
Langmuir, 2009A 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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NMR Studies of Nonionic Surfactants
2013NMR has contributed greatly to our current understanding of self-association, phase behaviour, and molecular dynamics in aqueous systems of oligo(ethylene oxide) mono-alkyl ether (CmEn) nonionic surfactants, which are extensively used in both basic scientific studies and technical applications as emulsifying agents and detergents.
Tiago Mendes Ferreira +2 more
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