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Showing 1 to 20 of 43 for “"microemulsions"”.
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Microemulsions formation, stability and their characterisations
… applications, droplet combustion of w/o microemulsions is also studied for different surfaces (i.e. silica, oxidised Fecralloy and catalyst coated Fecralloy) in the temperature range of 313-573K. Formaldehyde and acetaldehyde are formed as intermediate combustion products. Thus the …
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Transport properties of micellar solutions and microemulsions.
Binary nonionic surfactant-water systems were studied prior to the more complex nonionic surfactant-water-oil systems. Phase diagrams were determined for the tetraoxyethylene dodecylether (C[12]E[4])-water and the Brij 30-water systems; the available hexaoxyethylene dodecylether (C[12]E[6])-water …
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Magnetic resonance investigations of pH in microemulsions
… micelles formed in CTAB, Triton-X and AOT microemulsions. These techniques have enabled visualisation of propagating acidity fronts in the bromate-sulfite reaction using magnetic resonance imaging. Contrast agents that are sensitive to pH were investigated in aqueous and microemulsion …
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Solubilization of oil mixtures in anionic surfactant microemulsions.
… to predict solubilization of oil mixtures in microemulsions. Study and model results are used to explain why significant differences in the SEAR remediation efficiency of individual oil components could occur when the oil contaminant is a complex oil mixture.
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Magnetic resonance studies of chemical reactions in microemulsions
The Belousov-Zhabotinsky (BZ) reaction is the preeminent oscillating chemical reaction for the study of pattern formation in reaction-diffusion systems. The dispersal of the reaction in a water-in-oil AOT microemulsion (BZ-AOT reaction) gives rise to an extended range of patterns, including dash …
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Linker-based Lecithin Microemulsions as Transdermal Drug Delivery Systems
The interest in microemulsions as transdermal delivery systems have been motivated by their large surface area for mass transfer, their high solubilization capacity of hydrophobic actives, and their ability to improve skin penetration. Lecithins (mixtures of phospholipids similar to those find in …
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Novel microemulsions with an anionic/non-ionic surfactant mixture
Mikroemulsionen bestehen im einfachsten Fall aus Wasser, Öl und Tensid(en). Es handelt sich dabei im Gegensatz zu normalen Emulsionen um transparente, thermodynamisch stabile Phasen. Diesen makroskopisch einphasig erscheinenden Systemen liegen jedoch hoch komplexe Nanostrukturen zu Grunde. Die in …
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Diffusion of proteins inside crowded structures generated using microemulsions
Microemulsions are thermodynamically stable mixtures of water, oil and surfactant. In the case of microemulsions based on sugar surfactants a cosurfactant as an additional component is necessary, most often a short-chain alcohol. In this thesis mainly pure surfactants are used. The focus is on …
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Microemulsions containing centella asiatica extract as antioxidant and anti-acetylcholinesterase agent
The treatment of Alzheimer's disease (AD) has gained much attention due to the current and predicted prevalence of the disease. Centella asiatica hydroalcoholic extract (CAHE), lemongrass essential oil (LGEO) and virgin coconut oil (VCO) presenting antioxidant and acetylcholinesterase inhibition …
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The structure and kinetics of oil-in-water microemulsions stabilised by nonionic surfactants
… the single phase (10) alkane oil-in- water (01W) microemulsions stabilised by nonionic surfactants of the general structure H-(CH2)n(OCH2CH2)m-OH, abbreviated to CnEm. The aims were to attempt to characterise their behaviour in terms of the effect of the different constituents n, m, and alkane oil …
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A SANS study of the interfacial curvatures and the phase behavior in bicontinuous microemulsions
… curvatures was developed and applied to various microemulsions. The method involves the use of a clipped random wave model with an inverse 8th order polynomial spectral function. The spectral density function contains three basic length scales : the inter-domain distance, the coherence length, …
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Formation and Characterization of Vegetable Oil Microemulsions and Their Application in Oilseed Extraction and Biofuel
Microemulsions are thermodynamically stable dispersions of oil and water stabilized by a film of surfactants and/or co-surfactants. They have numerous applications in food, oilseed extraction, drug and cosmetic delivery, enhanced oil recovery, biofuels, etc. Microemulsion formation of vegetable …
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SURFACTANTS DERIVED FROM 2-HYDROXY-4-(METHYLTHIO)BUTYRIC ACID: PHASE BEHAVIOR, INTERFACIAL ACTIVITY, MICROEMULSIONS AND MORE
Surfactants derived from 2-hydroxy-4-(methylthio) butyric acid were investigated. Anionic surfactants derived from this molecule have excellent water solubility, hardness tolerance and surface activity. Nonionic surfactants based on this molecule presented excellent phase behavior in water, high …
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Development of microemulsion delivery systems for bioactive compounds : a thesis presented in partial fulfilment of the requirements for the degree of Doctor of Philosophy in Food Technology at Massey University, Auckland, New Zealand
… research was to fabricate oil-in-water (O/W) microemulsions which might be utilised as the delivery system for bioactive compounds. This thesis is mainly composed of two sections. The first section was to produce microemulsions via emulsion dilution method and water titration method as well as …
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Aplicação de microemulsões na solubilização de frações pesadas de petróleo
This work presents studies related to the use of microemulsions in the solubilization of heavy crude oil fractions responsible by the formation of deposits. The first stage of the work was addressed to the construction of phases diagrams, with the intention of determining the area within which the …
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Investigation of the NOx and PM emissions from a diesel engine operating on nanoemulsified fuels
… compared to published results for conventional microemulsions. There is no decrease in indicated fuel conversion efficiency for the nanoemulsions. Fer a 9% water nanoemulsion specific NOx emissions are reduced by l 3 - 20% and specific PM emissions are reduced by 15 - 20% compared to the base …
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Microemulsion and macroemulsion behaviour of systems containing oil, water and nonionic surfactant
… made to correlate some equilibrium properties of microemulsions with the formation and stability of macroemulsions. Studies have been mainly limited to water-in-oil (W/O) systems stabilised by pure nonionic surfactants of the poly-oxyethylene alkyl ether (CnEm) type. Initially however, a brief …
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