Amphiphilic nanostructures in aqueous solutions of triethyleneglycol monododecyl ether

Arabadzhieva, D.; Soklev, Borislav; Mileva, Elena

doi:10.1016/j.colsurfa.2012.11.058

Cited by 6 publications

(4 citation statements)

References 32 publications

(55 reference statements)

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“…Insofar as the foam films drain via a regime of high interfacial mobility, the partial stabilization of the foam film's drainage is most probably due to the Marangoni effect, related to the decomposition of the existing premicelles in the film bulk. The details of this partial stabilization are experimentally verified for single-surfactant cases [16,17,[19][20][21][22]. At higher C mix , but below CMC mix , this effect is complicated due to the continuous preferential adsorption of the nonionic surfactant.…”

Section: Discussionmentioning

confidence: 94%

Impact of Adsorption Layer Properties on Drainage Behavior of Microscopic Foam Films: The Case of Cationic/Nonionic Surfactant Mixtures

Arabadzhieva

Tchoukov

Mileva

2020

Colloids and Interfaces

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Aqueous mixtures of cationic hexadecyltrimethylammonium chloride (CTAC) and nonionic pentaethyleneglycol monododecyl ether (C12E5) are investigated. Adsorption layer properties are systematically studied within a wide concentration range for a 1:1 molar ratio of the surfactants. Surface tension and dilatational rheology measurements are conducted by profile analysis tensiometry. The interfacial data are juxtaposed to drainage kinetics and stability results for microscopic foam films, investigated by microinterferometric thin liquid film instrumentation. The obtained results give experimental evidence of synergistic interactions in the studied solutions, as compared to the corresponding single surfactant systems. Specific runs of dynamic and equilibrium surface tension curves are registered against the total surfactant quantity; the surface dilatational elasticities for the mixtures are systematically higher. A clear correlation is established between adsorption layer performance and foam film characteristics. The maxima of the film lifetimes are well outlined, and the respective values are shifted towards lower overall concentrations. The reported results substantiate the key role of the adsorption layers, and the surface dilatational properties in particular, for foam film drainage kinetics and stability. The well-expressed synergy observed in adsorption layer and foam film properties suggests the substantial benefits of using mixed surfactant systems in the design and fine-tuning of foam systems for innovative applications.

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Section: Discussionmentioning

confidence: 94%

Impact of Adsorption Layer Properties on Drainage Behavior of Microscopic Foam Films: The Case of Cationic/Nonionic Surfactant Mixtures

Arabadzhieva

Tchoukov

Mileva

2020

Colloids and Interfaces

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“…Moreover, they found that hydrogen bonding interactions between rhamnose headgroups stabilized these kinds of aggregates, favoring pre-micellization [ 174 ]. The formation of aggregates of multiple monomers taken together by intermolecular interactions prior to the formation of full micelles has been postulated for multiple surfactant systems [ 200 , 201 , 202 , 203 , 204 ], but a significant difference with respect to the R1 case concerns the surfactant concentration at which it takes place; in other cases, for pre-micelles formed at concentrations below or very close to the cmc , in the R1 case, they should exist up to concentrations of about 50 times the cmc . Therefore, it is our opinion that some caution should be taken before identifying the loose aggregates experimentally observed in solution as pre-micelles.…”

Section: Aggregation Behaviormentioning

confidence: 99%

Rhamnolipid Self-Aggregation in Aqueous Media: A Long Journey toward the Definition of Structure–Property Relationships

Esposito

Speciale

Castro

et al. 2023

IJMS

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The need to protect human and environmental health and avoid the widespread use of substances obtained from nonrenewable sources is steering research toward the discovery and development of new molecules characterized by high biocompatibility and biodegradability. Due to their very widespread use, a class of substances for which this need is particularly urgent is that of surfactants. In this respect, an attractive and promising alternative to commonly used synthetic surfactants is represented by so-called biosurfactants, amphiphiles naturally derived from microorganisms. One of the best-known families of biosurfactants is that of rhamnolipids, which are glycolipids with a headgroup formed by one or two rhamnose units. Great scientific and technological effort has been devoted to optimization of their production processes, as well as their physicochemical characterization. However, a conclusive structure–function relationship is far from being defined. In this review, we aim to move a step forward in this direction, by presenting a comprehensive and unified discussion of physicochemical properties of rhamnolipids as a function of solution conditions and rhamnolipid structure. We also discuss still unresolved issues that deserve further investigation in the future, to allow the replacement of conventional surfactants with rhamnolipids.

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“…It has been clarified in [15,16 ] how the surfactant adsorption layer properties are related to the course of the drainage parameters of microscopic foam films in the special case of aqueous solutions of the ionic and non-ionic amphiphiles, containing premicellar nanostructures. It was established that in the premicellar concentration domain considerable irregularities of the adsorption layer properties are observed: plateau and kink regions are registered in the experimental surface tension isotherm along with unusual changes of the surface rheological characteristics.…”

Section: Impact Of Adsorption Layers On Properties Of Thin Liquid Filmsmentioning

confidence: 99%

“…These parameters are: film thinning times, critical concentration for black film formation, film stability in terms of probability for stable black foam film formation, film thickness and dependence of its change under applied external pressure, interactions with substances in the bulk, etc. They could be used to direction of optimization and improvement the production technologies as well as development of new generation of therapeutic surfactant preparations [16,17,18,19].…”

Section: Smart Systems and Formulations With Possible Medical Applicamentioning

confidence: 99%

Smart and green interfaces: From single bubbles/drops to industrial environmental and biomedical applications

Dutschk

Karapantsios

Liggieri

et al. 2014

Advances in Colloid and Interface Science

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Interfaces can be called Smart and Green (S&G) when tailored such that the required technologies can be implemented with high efficiency, adaptability and selectivity. At the same time they have also to be eco-friendly, i.e. products must be biodegradable, reusable or simply more durable. Bubble and drop interfaces are in many of these smart technologies the fundamental entities and help develop smart products of the everyday life.Significant improvements of these processes and products can be achieved by implementing and manipulating specific properties of these interfaces in a simple and smart way, in order to accomplish specific tasks. The severe environmental issues require in addition attributing ecofriendly features to these interfaces, by incorporating innovative , or, sometime, recycle materials and conceiving new production processes which minimize the use of natural resources and energy. Such concept can be extended to include important societal challenges related to support a sustainable development and a healthy population.The achievement of such ambitious targets requires the technology research to be supported by a robust development of theoretical and experimental tools, needed to understand in more details the behavior of complex interfaces. A wide but not exhaustive review of recent work concerned with green and smart interfaces is presented, addressing different scientific and technological fields. The presented approaches reveal a huge potential in relation to various technological fields, such as nanotechnologies, biotechnologies, medical diagnostics, new or improved materials.

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Amphiphilic nanostructures in aqueous solutions of triethyleneglycol monododecyl ether

Cited by 6 publications

References 32 publications

Impact of Adsorption Layer Properties on Drainage Behavior of Microscopic Foam Films: The Case of Cationic/Nonionic Surfactant Mixtures

Impact of Adsorption Layer Properties on Drainage Behavior of Microscopic Foam Films: The Case of Cationic/Nonionic Surfactant Mixtures

Rhamnolipid Self-Aggregation in Aqueous Media: A Long Journey toward the Definition of Structure–Property Relationships

Smart and green interfaces: From single bubbles/drops to industrial environmental and biomedical applications

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