Phase inversion in emulsions studied by low field NMR

Barrabino, Albert; Keleşoğlu, Serkan; Sørland, Geir Humborstad; Simon, Sébastien; Sjöblom, Johan

doi:10.1016/j.colsurfa.2013.11.016

Cited by 10 publications

(10 citation statements)

References 29 publications

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“…A mixer was used to stir the oil phase and the added brine in the NMR tube during the measurements. Electrical conductivity measurements confirm that the inversion takes place at the corresponding water cut [50]. In all the experiments, the aqueous phase was added to the oil phase.…”

Section: Emulsion Inversionmentioning

confidence: 69%

“…For a spherical system the vector potential reduces to one component, A φ , which is parallel with the direction of the current [50]. In the following the spherical coordinates will be used to evaluated the magnetic field from an anti-Helmholz coil, starting with the vector potential B = ∇ × A.…”

Section: Magnetic Field Gradients Generated By An Anti-helmholz Coilmentioning

confidence: 99%

“…Because of the instability of the emulsion, the nature of the dispersed phase in the continuous phase may change from w/o to o/w in an emulsion or vice versa. HLD also allows the prediction of the emulsion type [50]. Inversion can happen due to a change in water-oil ratio (WOR) or physicochemical properties.…”

Section: Emulsion Inversionmentioning

confidence: 99%

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Dynamic Pulsed-Field-Gradient NMR

Sørland¹

2014

Springer Series in Chemical Physics

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The purpose of this series is to provide comprehensive up-to-date monographs in both well established disciplines and emerging research areas within the broad fields of chemical physics and physical chemistry. The books deal with both fundamental science and applications, and may have either a theoretical or an experimental emphasis. They are aimed primarily at researchers and graduate students in chemical physics and related fields.More information about this series at

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Section: Emulsion Inversionmentioning

confidence: 69%

Section: Magnetic Field Gradients Generated By An Anti-helmholz Coilmentioning

confidence: 99%

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Dynamic Pulsed-Field-Gradient NMR

Sørland¹

2014

Springer Series in Chemical Physics

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“…Moreover, the downward shift of the T 2 H relaxation time distribution increased with increasing shear intensity during production, and thus with decreasing droplet size. Higher T 2 H values were observed at lower stirring rates, and lower T 2 H values were observed with higher stirring rates …”

Section: Resultsmentioning

confidence: 88%

“…The variation of the apparent spin‐spin relaxation time (T 2 H) of the emulsions is based on the difference of the spin‐spin relaxation time of water molecules inside a water droplet . Table and Figure show the T 2 H measurements and distributions curves for NEs vehicle and with POP, respectively.…”

Section: Resultsmentioning

confidence: 99%

Development and Characterization of Nanoemulsion Containing Almond Oil, Biodegradable Polymer and Propranolol as Potential Treatment in Hemangioma

Coelho

Campos

Freitas

et al. 2018

Macromolecular Symposia

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Hemangiomas are benign tumors, which cause an abnormal proliferation of endothelial cells. In recent years, propranolol (POP) has been used for the therapy of infantile hemangiomas (IH). Topical POP has been prescribed instead of systemic steroids to reduce the risk of side effects. In order to increase the effectiveness of the POP, nanoemulsions (NEs) were developed as drug delivery carriers for topical delivery. NEs are stable dispersions consisting of oil, water and surfactants. To develop NEs water‐in‐oil, POP was solubilized in two concentrations, at 0.25 wt% and 0.5 wt% in water. To prepare the external phase, the almond oil, a biocompatible vegetable oil, was chosen due its anti‐inflammatory properties. An optimal proportion of surfactant and co‐surfactant, Tween 80/Span 80, were assessed by pseudo‐ternary phase diagram. NEs were obtained by ultrasonic processor and the mean droplet size was measured by Dynamic Light Scattering (DLS) and it was less than 300 nm. POP was included in the best formulation for stability studies, Nuclear Magnetic Resonance (NMR) studies, by the analysis of proton relaxation time, cell viability studies and occlusivity test. At the end of the work, the stable NEs, containing POP, diluted above 200 fold, did not affect cell viability and it can be considered as a promising formulation for the treatment of superficial infantile hemangioma.

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Description of Disperse Multiphase Processes: Quo Vadis?

Hohl

Panckow

Schulz

et al. 2018

Chemie Ingenieur Technik

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The experimental accessibility of disperse systems often is a critical factor when it comes to the development of modeling approaches that intend to converge towards an exact solution. Often, integral or pseudo‐homogeneous values are used to reduce the complexity of the system, but a detailed single particle or interface analysis is crucial to understand relevant effects that also affect the swarm behavior. A high number of experimental techniques with respective limitations and advantages is available to quantify these effects. In this work, an overview on measurement techniques for momentum, heat and mass transfer in particle swarms as well as for the particle size distribution and interface characterization is provided. The industrial applicability is addressed by pointing out the vicinity to the process and the costs of different measurement techniques.

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Phase inversion in emulsions studied by low field NMR

Cited by 10 publications

References 29 publications

Dynamic Pulsed-Field-Gradient NMR

Dynamic Pulsed-Field-Gradient NMR

Development and Characterization of Nanoemulsion Containing Almond Oil, Biodegradable Polymer and Propranolol as Potential Treatment in Hemangioma

Description of Disperse Multiphase Processes: Quo Vadis?

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