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Sonalika Vaidya - One of the best experts on this subject based on the ideXlab platform.
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Correction: Understanding the role of Co-Surfactants in microemulsions on the growth of copper oxalate using SAXS
Physical chemistry chemical physics : PCCP, 2019Co-Authors: Sunaina, Vaishali Sethi, Surinder K Mehta, Ashok K Ganguli, Sonalika VaidyaAbstract:This study is an effort to understand the mechanism of the effect of the chain length of Co-Surfactants on the growth of copper oxalate inside the core of reverse micelles using small angle X-ray scattering (SAXS). In this study, we have used two different kinds of Co-Surfactants viz. 1-butanol (C4) and 1-octanol (C8) for the formation of the microemulsions. Time-dependent SAXS studies were carried out for these two systems. The data were analyzed using both the model-independent approach and model-dependent approach. For microemulsions containing only water inside the core of reverse micelles (no ions), the shape of the reverse micelles was observed to be ellipsoid and spherical in nature for 1-butanol and 1-octanol respectively. For a system containing copper oxalate nanostructures, the fitting was carried out using the ellipsoidal core–shell model for reverse micelles and spheres, ellipsoids and cylinders for copper oxalate nanostructures with 1-butanol as the co-surfactant. With 1-octanol as the co-surfactant, the two contributions that were used were the spherical core–shell model for reverse micelles and spheres for copper oxalate nanostructures. Based on the analysis of SAXS data, a growth mechanism has been proposed. The study discussed here could open the field of understanding the growth mechanism of complex nanostructures formed using the microemulsion route.
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Understanding the role of Co-Surfactants in microemulsions on the growth of copper oxalate using SAXS.
Physical chemistry chemical physics : PCCP, 2018Co-Authors: Sunaina, Vaishali Sethi, Surinder K Mehta, Ashok K Ganguli, Sonalika VaidyaAbstract:This study is an effort to understand the mechanism of the effect of the chain length of Co-Surfactants on the growth of copper oxalate inside the core of reverse micelles using small angle X-ray scattering (SAXS). In this study, we have used two different kinds of Co-Surfactants viz. 1-butanol (C4) and 1-octanol (C8) for the formation of the microemulsions. Time-dependent SAXS studies were carried out for these two systems. The data were analyzed using both the model-independent approach and model-dependent approach. For microemulsions containing only water inside the core of reverse micelles (no ions), the shape of the reverse micelles was observed to be ellipsoid and spherical in nature for 1-butanol and 1-octanol respectively. For a system containing copper oxalate nanostructures, the fitting was carried out using the ellipsoidal core-shell model for reverse micelles and spheres, ellipsoids and cylinders for copper oxalate nanostructures with 1-butanol as the co-surfactant. With 1-octanol as the co-surfactant, the two contributions that were used were the spherical core-shell model for reverse micelles and spheres for copper oxalate nanostructures. Based on the analysis of SAXS data, a growth mechanism has been proposed. The study discussed here could open the field of understanding the growth mechanism of complex nanostructures formed using the microemulsion route.
Constantina Tzia - One of the best experts on this subject based on the ideXlab platform.
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Study of the Emulsifying Ability of Olive Oil Endogenous Compounds in Co-surfactant Free Olive Oil w/o Nanoemulsions with Food Grade Non-ionic Surfactants
Food and Bioprocess Technology, 2016Co-Authors: Vasiliki Polychniatou, Constantina TziaAbstract:In the present work, the preparation of olive oil w/o nanoemulsions was studied using non-ionic surfactants (Tween 20, Span 20) without the addition of a co-surfactant. Different olive oil endogenous compounds with an amphiphilic character (gallic acid, apigenin, quercetin, and trans-cinnamic acid) were dispersed into the aqueous phase, and their impact on the nanoemulsions stability and properties ability was determined. The stable nanoemulsions were presented in pseudo-ternary phase diagrams (oil–aqueous phase–surfactant) for each surfactant and endogenous compound. The nanoemulsions properties were evaluated in relationship to compositional components. The results of this study concluded that stable w/o olive oil nanoemulsions without use of a co-surfactant were obtained and moreover, the most efficient type of emulsifier and its ratio of addition in the system were determined. The incorporation of olive oil endogenous compounds resulted into more stable emulsions. In particular, gallic acid was proven to be the most efficient compound since it enhanced the emulsion properties prolonging simultaneously the emulsions’ stability.
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study of formulation and stability of co surfactant free water in olive oil nano and submicron emulsions with food grade non ionic surfactants
Journal of the American Oil Chemists' Society, 2014Co-Authors: Vasiliki Polychniatou, Constantina TziaAbstract:Nanoemulsions are of great interest in food industry finding various food applications. However, oil-in-water (o/w) nanoemulsions have been intensively investigated, but there are few studies on w/o nanoemulsions. In the present work the preparation of nanoemulsions with olive oil using non-ionic surfactants (Tween 20, 40, 60, 80, Span 20, 80) without the addition of a co-surfactant was studied and their emulsion properties and stability were examined. The stable nanoemulsions were presented in ternary phase diagrams (oil–water-surfactant) for each surfactant and the emulsifying ability of the efficient surfactants was determined. The nanoemulsions properties were evaluated in relationship to compositional components. From the results of this study it can be concluded that stable olive oil nanoemulsions without use of a co-surfactant were obtained and moreover the most efficient type of emulsifier and its ratio of addition in the system were determined.
Reinhard Miller - One of the best experts on this subject based on the ideXlab platform.
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Surface Tension and Adsorption Studies by Drop Profile Analysis Tensiometry
Journal of Surfactants and Detergents, 2017Co-Authors: T. Kairaliyeva, Nenad Mucic, Valentin B. Fainerman, Eugene V. Aksenenko, A. V. Makievski, Reinhard MillerAbstract:Surface tension and dilational viscoelasticity of solutions of various surfactants measured with bubble and drop profile analysis tensiometry are discussed. The study also includes experiments on the co-adsorption of surfactant molecules from a solution drop and alkane molecules from saturated alkane vapor phase. Using experimental data for 12 surfactants with different surface activities, it is shown that depletion due to adsorption of surfactant from the drop bulk can be significant. An algorithm is proposed quantitatively to take into consideration the depletion effect which is required for a correct description of the co-adsorption of alkanes on the solution drop surface and the correct analysis of experimental dynamic surface tension data to determine the adsorption mechanism. Bubble and drop profile analysis tensiometry is also the method of choice for measuring the dilational viscoelasticity of the adsorbed interfacial layer. The same elasticity moduli are obtained with the bubble and drop method only when the equilibrium surface pressures are sufficiently small (Π
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Effect of partial vapor pressure on the co-adsorption of surfactants and hexane at the water/hexane vapor interface
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2015Co-Authors: Nenad Mucic, N. Moradi, Aliyar Javadi, Valentin B. Fainerman, Eugene V. Aksenenko, Reinhard MillerAbstract:The adsorption of surfactants from aqueous solution at the water/air interface is changed when the air phase contains hexane vapor. This co-adsorption of surfactant and hexane depends on the hexane vapor pressure. A thermodynamic model developed for the adsorption of surfactant mixtures can be adapted to the present situation. The surfactants studied were SDS, C12TAB and C12DMPO, and the dependence of their adsorption characteristics on the partial hexane vapor pressure was determined. The co-adsorption of hexane from the vapor phase increases the surface activity of the adsorbing surfactants.
Eckhard Dinjus - One of the best experts on this subject based on the ideXlab platform.
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interfacial phenomena in the system water co2 alcohol ethoxylates
Journal of Chemical & Engineering Data, 2003Co-Authors: Andreas Hebach, Alexander Oberhof, Nicolaus Dahmen, Eckhard DinjusAbstract:A systematic investigation of alcohol ethoxylates (AEOs) and their use as surfactants in the CO 2 + water system was performed by measuring the interfacial tension (IFT) at 283 K and (5 to 20) MPa. It is the first time that the polydispersity of the AEOs has been studied. The synergistic effect was examined thoroughly. The findings enable the surfactant behavior to be expressed as the hydrophilic-CO 2 -philic balance, analogous to the HLB of the tradinional o/w systems, and also permit a relationship to be established between surfactant structure and the behavior at the interface.
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Interfacial Phenomena in the System Water + CO2 + Alcohol Ethoxylates
Journal of Chemical & Engineering Data, 2003Co-Authors: Andreas Hebach, Alexander Oberhof, Nicolaus Dahmen, Eckhard DinjusAbstract:A systematic investigation of alcohol ethoxylates (AEOs) and their use as surfactants in the CO 2 + water system was performed by measuring the interfacial tension (IFT) at 283 K and (5 to 20) MPa. It is the first time that the polydispersity of the AEOs has been studied. The synergistic effect was examined thoroughly. The findings enable the surfactant behavior to be expressed as the hydrophilic-CO 2 -philic balance, analogous to the HLB of the tradinional o/w systems, and also permit a relationship to be established between surfactant structure and the behavior at the interface.
Sunaina - One of the best experts on this subject based on the ideXlab platform.
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Correction: Understanding the role of Co-Surfactants in microemulsions on the growth of copper oxalate using SAXS
Physical chemistry chemical physics : PCCP, 2019Co-Authors: Sunaina, Vaishali Sethi, Surinder K Mehta, Ashok K Ganguli, Sonalika VaidyaAbstract:This study is an effort to understand the mechanism of the effect of the chain length of Co-Surfactants on the growth of copper oxalate inside the core of reverse micelles using small angle X-ray scattering (SAXS). In this study, we have used two different kinds of Co-Surfactants viz. 1-butanol (C4) and 1-octanol (C8) for the formation of the microemulsions. Time-dependent SAXS studies were carried out for these two systems. The data were analyzed using both the model-independent approach and model-dependent approach. For microemulsions containing only water inside the core of reverse micelles (no ions), the shape of the reverse micelles was observed to be ellipsoid and spherical in nature for 1-butanol and 1-octanol respectively. For a system containing copper oxalate nanostructures, the fitting was carried out using the ellipsoidal core–shell model for reverse micelles and spheres, ellipsoids and cylinders for copper oxalate nanostructures with 1-butanol as the co-surfactant. With 1-octanol as the co-surfactant, the two contributions that were used were the spherical core–shell model for reverse micelles and spheres for copper oxalate nanostructures. Based on the analysis of SAXS data, a growth mechanism has been proposed. The study discussed here could open the field of understanding the growth mechanism of complex nanostructures formed using the microemulsion route.
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Understanding the role of Co-Surfactants in microemulsions on the growth of copper oxalate using SAXS.
Physical chemistry chemical physics : PCCP, 2018Co-Authors: Sunaina, Vaishali Sethi, Surinder K Mehta, Ashok K Ganguli, Sonalika VaidyaAbstract:This study is an effort to understand the mechanism of the effect of the chain length of Co-Surfactants on the growth of copper oxalate inside the core of reverse micelles using small angle X-ray scattering (SAXS). In this study, we have used two different kinds of Co-Surfactants viz. 1-butanol (C4) and 1-octanol (C8) for the formation of the microemulsions. Time-dependent SAXS studies were carried out for these two systems. The data were analyzed using both the model-independent approach and model-dependent approach. For microemulsions containing only water inside the core of reverse micelles (no ions), the shape of the reverse micelles was observed to be ellipsoid and spherical in nature for 1-butanol and 1-octanol respectively. For a system containing copper oxalate nanostructures, the fitting was carried out using the ellipsoidal core-shell model for reverse micelles and spheres, ellipsoids and cylinders for copper oxalate nanostructures with 1-butanol as the co-surfactant. With 1-octanol as the co-surfactant, the two contributions that were used were the spherical core-shell model for reverse micelles and spheres for copper oxalate nanostructures. Based on the analysis of SAXS data, a growth mechanism has been proposed. The study discussed here could open the field of understanding the growth mechanism of complex nanostructures formed using the microemulsion route.