Extraction of model contaminants from solid surfaces by environmentally compatible microemulsions

Vargas-Ruiz, Salomé; Schulreich, Christoph; Kostevic, Angelika; Tiersch, Brigitte; Koetz, Joachim; Kakorin, Sergej; Klitzing, Regine von; Jung, Martin H.; Hellweg, Thomas; Wellert, Stefan

doi:10.1016/j.jcis.2016.03.006

Cited by 16 publications

(15 citation statements)

References 46 publications

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“…The optimal oil content to remove hydrophobic solutes is not 100%, but at a compromise between oil content as a reservoir for solutes and the surface tension. 511 The scattering patterns of the microemulsions used give a characteristic size of the order of 10 nm, while cryo-SEM gives sizes typically five times larger, as can be seen in Figure 34. The validity of these micrographs is questionable because the specimens were prepared without environmental control and plunged into freezing liquid nitrogen ("nitrogen slush"), which is insufficient to suppress ice crystal growth, but instead may indicate how quickly structural changes can take place in such systems upon changing the external parameters.…”

Section: Microemulsions In Extraction Processesmentioning

confidence: 93%

“…A recent example studied the kinetics and efficiency of a convenient microemulsion, for which the water–oil ratio can be tuned. The optimal oil content to remove hydrophobic solutes is not 100%, but at a compromise between oil content as a reservoir for solutes and the surface tension . The scattering patterns of the microemulsions used give a characteristic size of the order of 10 nm, while cryo-SEM gives sizes typically five times larger, as can be seen in Figure .…”

Section: Microemulsions Used In Applicationsmentioning

confidence: 99%

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Using Microemulsions: Formulation Based on Knowledge of Their Mesostructure

et al. 2021

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Microemulsions, as thermodynamically stable mixtures of oil, water, and surfactant, are known and have been studied for more than 70 years. However, even today there are still quite a number of unclear aspects, and more recent research work has modified and extended our picture. This review gives a short overview of how the understanding of microemulsions has developed, the current view on their properties and structural features, and in particular, how they are related to applications. We also discuss more recent developments regarding nonclassical microemulsions such as surfactant-free (ultraflexible) microemulsions or ones containing uncommon solvents or amphiphiles (like antagonistic salts). These new findings challenge to some extent our previous understanding of microemulsions, which therefore has to be extended to look at the different types of microemulsions in a unified way. In particular, the flexibility of the amphiphilic film is the key property to classify different microemulsion types and their properties in this review. Such a classification of microemulsions requires a thorough determination of their structural properties, and therefore, the experimental methods to determine microemulsion structure and dynamics are reviewed briefly, with a particular emphasis on recent developments in the field of direct imaging by means of electron microscopy. Based on this classification of microemulsions, we then discuss their applications, where the application demands have to be met by the properties of the microemulsion, which in turn are controlled by the flexibility of their amphiphilic interface. Another frequently important aspect for applications is the control of the rheological properties. Normally, microemulsions are low viscous and therefore enhancing viscosity has to be achieved by either having high concentrations (often not wished for) or additives, which do not significantly interfere with the microemulsion. Accordingly, this review gives a comprehensive account of the properties of microemulsions, including most recent developments and bringing them together from a united viewpoint, with an emphasis on how this affects the way of formulating microemulsions for a given application with desired properties.

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Section: Microemulsions In Extraction Processesmentioning

confidence: 93%

Section: Microemulsions Used In Applicationsmentioning

confidence: 99%

Using Microemulsions: Formulation Based on Knowledge of Their Mesostructure

et al. 2021

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“…The tuning of the interfacial curvature can be achieved by the addition of a cosurfactant (pentanol). The microemulsions were formulated in quaternary systems (methyl oleate/D 2 O/ SL55/pentanol) 5 and (tetradecane/D 2 O/SL55/pentanol). The phase diagrams of these quaternary systems were measured at constant oil-towater ratios (α), and the contents of the sugar surfactant (γ) and cosurfactant pentanol (δ) were varied (Supporting Information 1).…”

Section: Methodsmentioning

confidence: 99%

“…Biodegradable, nontoxic, and environmentally compatible microemulsions are ideal media for use in multiple applications such as drug delivery, decontamination and cleaning of sensitive surfaces, − cosmetics and personal care, food science, and oil recovery, among others. The performance of the microemulsions in these applications depends mainly on their ability to wet and adhere to a variety of solid surfaces (e.g., skin, fabrics, metals, polymers, construction materials, etc.)…”

Section: Introductionmentioning

confidence: 99%

Sugar Surfactant Based Microemulsions at Solid Surfaces: Influence of the Oil Type and Surface Polarity

et al. 2016

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The structure of sugar-surfactant-based bicontinuous microemulsions in the bulk and at hydrophilic and hydrophobic solid planar surfaces was studied by means of neutron scattering techniques (SANS, NR, and GISANS). In particular, the influence of the type of oil (tetradecane and methyl oleate) on the structural properties in the vicinity of surfaces was investigated at different oil-to-water ratios. In the case of hydrophilic surfaces, the analysis of the scattering length density profiles reveals an induced ordering of the oil and water domains perpendicular to the solid-liquid interface in both sets of microemulsions. At hydrophobic surfaces, differences in the near-surface ordering between microemulsions containing polar and nonpolar oils are observed.

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“…It is shown in Figure 3. It gives a direct illustration of the fact that the topology of the phases can be tuned and even inverted (the famous Shinoda cut) [39,40], opening the road to chemical reactions either in droplets of either type used as microreactors, or at the (giant) interface of bicontinous microemulsions, benefitting of both available solubility channels in the samples [41,42], also for decontamination [43,44].…”

Section: Microemulsionsmentioning

confidence: 99%

Introduction to soft matter and neutron scattering

Oberdisse

2018

EPJ Web of Conferences

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As an opening lecture to the French-Swedish neutron scattering school held in Uppsala (6th to 9th of December 2016), the basic concepts of both soft matter science and neutron scattering are introduced. Typical soft matter systems like self-assembled surfactants in water, microemulsions, (co-)polymers, and colloids are presented. It will be shown that widely different systems have a common underlying physics dominated by the thermal energy, with astonishing consequences on their statistical thermodynamics, and ultimately rheological properties – namely softness. In the second part, the fundamentals of neutron scattering techniques and in particular small-angle neutron scattering as a powerful method to characterize soft matter systems will be outlined.

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Extraction of model contaminants from solid surfaces by environmentally compatible microemulsions

Cited by 16 publications

References 46 publications

Using Microemulsions: Formulation Based on Knowledge of Their Mesostructure

Using Microemulsions: Formulation Based on Knowledge of Their Mesostructure

Sugar Surfactant Based Microemulsions at Solid Surfaces: Influence of the Oil Type and Surface Polarity

Introduction to soft matter and neutron scattering

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