Heterogemini Surfactants Based on Fatty Acid Synthesis and Interfacial Properties

Alami, E.; Holmberg, Krister

doi:10.1006/jcis.2001.7502

Cited by 68 publications

(55 citation statements)

References 28 publications

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“…The products obtained at this stage can be regarded as nonionic surfactants with a branched hydrophobic tail. The synthesis and the characterization of these have been reported previously (11).…”

Section: Synthesismentioning

confidence: 99%

Adsorption Properties of Novel Gemini Surfactants with Nonidentical Head Groups

Alami

Holmberg

Eastoe

2002

Journal of Colloid and Interface Science

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Section: Synthesismentioning

confidence: 99%

Adsorption Properties of Novel Gemini Surfactants with Nonidentical Head Groups

Alami

Holmberg

Eastoe

2002

Journal of Colloid and Interface Science

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“…For a fixed length of both hydrophobic tails the cmc increases with the spacer length until it reaches a maximum value, and then the value decreases [262,265,266]. Furthermore, gemini surfactants with different headgroups -so-called heterogemini [267][268][269]-show very interesting properties; among these geminis we find zwitterionic surfactants which present an intermediate nature between ionic and non-ionic surfactants, and depending on the type of the head groups they may show pH-dependent properties [270]. Aqueous solutions of some dimeric surfactants with short spacers show a very high viscosity at relative low concentrations and/or display viscoelasticity and shear induced viscoelasticity [271].…”

Section: Gemini Surfactantsmentioning

confidence: 99%

The formation of host–guest complexes between surfactants and cyclodextrins

Valente

Söderman

2014

Advances in Colloid and Interface Science

183

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Cyclodextrins are able to act as host molecules in supramolecular chemistry with applications ranging from pharmaceutics to detergency. Among guest molecules surfactants play an important role with both fundamental and practical applications. The formation of cyclodextrin/surfactant host-guest compounds leads to an increase in the critical micelle concentration and in the solubility of surfactants. The possibility of changing the balance between several intermolecular forces, and thus allowing the study of, e.g., dehydration and steric hindrance effects upon association, makes surfactants ideal guest molecules for fundamental studies. Therefore, these systems allow for obtaining a deep insight into the host-guest association mechanism. In this paper, we review the influence on the thermodynamic properties of CD-surfactant association by highlighting the effect of different surfactant architectures (single tail, double-tailed, gemini and bolaform), with special emphasis on cationic surfactants. This is complemented with an assessment of the most common analytical techniques used to follow the association process. The applied methods for computation of the association stoichiometry and stability constants are also reviewed and discussed; this is an important point since there are significant discrepancies and scattered data for similar systems in the literature.In general, the surfactant-cyclodextrin association is treated without reference to the kinetics of the process. However, there are several examples where the kinetics of the process can be investigated, in particular those where volumes of the CD cavity and surfactant (either the tail or in special cases the head group) are similar in magnitude.This will also be critically reviewed.

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“…This allows for the development of environmental surfactants for a wide variety of industrial applications. Based on a similar strategy, Alami and co-workers have reported oleylnitrile-based nonionic heterogemini surfactants containing hydroxyl and polyoxyethylene headgroups 5 and oleylnitrile-based anionic heterogemini surfactants containing sulfate and polyoxyethylene headgroups 6 .…”

Section: Introductionmentioning

confidence: 99%

Sulfonic-Hydroxyl-Type Heterogemini Surfactants Synthesized from Unsaturated Fatty Acids

et al. 2010

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Novel anionic heterogemini surfactants have been synthesized from two kinds of unsaturated fatty acids (oleic acid and petroselinic acid). The hydrocarbon chain is covalently bound to the terminal carbonyl group of the unsaturated fatty acids and hydrophilic headgroups (i.e., sulfonic and hydroxyl groups) are introduced to the cis double bond. The aqueous solution properties of the surfactants synthesized here have been studied on the basis of static/dynamic surface tension, conductivity, fl uorescence, and dynamic light scattering (DLS) data. We have mainly focused on the following two factors that may signifi cantly impact the aqueous solution properties of the surfactants: one is hydrocarbon chain length and the other is molecular symmetry. The fi rst key result from our current study is that increased hydrocarbon chain length results in a closely packed monolayer fi lm at the air/aqueous solution interface, even at low concentrations as a result of the increased hydrophobicity of the longer chain analogue. We have previously observed a similar trend when aqueous solution properties of oleic acid-based phosphate-type heterogemini surfactants were studied. The second key fi nding of our current research is that increased molecular symmetry results in greater surface activities (which include lower aqueous surface tension and greater molecular packing at the air/aqueous solution interface). In addition, it seems likely that the size of molecular assemblies spontaneously formed in bulk solution decreases when the molecular symmetry increases. These results suggest that the symmetric analogue provides greater hydrophobic environments, although the exact reason for this is not yet known.

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Heterogemini Surfactants Based on Fatty Acid Synthesis and Interfacial Properties

Cited by 68 publications

References 28 publications

Adsorption Properties of Novel Gemini Surfactants with Nonidentical Head Groups

Adsorption Properties of Novel Gemini Surfactants with Nonidentical Head Groups

The formation of host–guest complexes between surfactants and cyclodextrins

Sulfonic-Hydroxyl-Type Heterogemini Surfactants Synthesized from Unsaturated Fatty Acids

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