The Experts below are selected from a list of 744 Experts worldwide ranked by ideXlab platform
Sylvie Cohen-addad - One of the best experts on this subject based on the ideXlab platform.
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Rheology of foams and Highly Concentrated Emulsions
Current Opinion in Colloid and Interface Science, 2014Co-Authors: Sylvie Cohen-addad, Roland HohlerAbstract:We review the state of the art in foam and Highly Concentrated Emulsion rheology, with an emphasis on progress made over the last five years. Since the structures and physico-chemical processes relevant for foams and Emulsions are closely analogous, comparing the knowledge recently gained in these two neighboring fields brings fresh insight. In this spirit, we review how the macroscopic mechanical response arises from a coupling between interfacial energy and long range molecular interactions, entropic effects, interfacial rheology, and dynamics at the droplet or bubble scale. We present experiments and models concerning elasticity, osmotic pressure, yielding and flow behavior.
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Rheology of foams and Highly Concentrated Emulsions
Current Opinion in Colloid & Interface Science, 2014Co-Authors: Sylvie Cohen-addad, Reinhard HoehlerAbstract:We review the state of the art in foam and Highly Concentrated Emulsion rheology, with an emphasis on progress made over the last five years. Since the structures and physico-chemical processes relevant for foams and Emulsions are closely analogous, comparing the knowledge recently gained in these two neighboring fields brings fresh insight. In this spirit, we review how the macroscopic mechanical response arises from a coupling between interfacial energy and long range molecular interactions, entropic effects, interfacial rheology, and dynamics at the droplet or bubble scale. We present experiments and models concerning elasticity, osmotic pressure, yielding and flow behavior. (C) 2014 Elsevier Ltd. All rights reserved.
Roland Hohler - One of the best experts on this subject based on the ideXlab platform.
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Rheology of foams and Highly Concentrated Emulsions
Current Opinion in Colloid and Interface Science, 2014Co-Authors: Sylvie Cohen-addad, Roland HohlerAbstract:We review the state of the art in foam and Highly Concentrated Emulsion rheology, with an emphasis on progress made over the last five years. Since the structures and physico-chemical processes relevant for foams and Emulsions are closely analogous, comparing the knowledge recently gained in these two neighboring fields brings fresh insight. In this spirit, we review how the macroscopic mechanical response arises from a coupling between interfacial energy and long range molecular interactions, entropic effects, interfacial rheology, and dynamics at the droplet or bubble scale. We present experiments and models concerning elasticity, osmotic pressure, yielding and flow behavior.
Reinhard Hoehler - One of the best experts on this subject based on the ideXlab platform.
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Rheology of foams and Highly Concentrated Emulsions
Current Opinion in Colloid & Interface Science, 2014Co-Authors: Sylvie Cohen-addad, Reinhard HoehlerAbstract:We review the state of the art in foam and Highly Concentrated Emulsion rheology, with an emphasis on progress made over the last five years. Since the structures and physico-chemical processes relevant for foams and Emulsions are closely analogous, comparing the knowledge recently gained in these two neighboring fields brings fresh insight. In this spirit, we review how the macroscopic mechanical response arises from a coupling between interfacial energy and long range molecular interactions, entropic effects, interfacial rheology, and dynamics at the droplet or bubble scale. We present experiments and models concerning elasticity, osmotic pressure, yielding and flow behavior. (C) 2014 Elsevier Ltd. All rights reserved.
David Julian Mcclements - One of the best experts on this subject based on the ideXlab platform.
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fabrication of Concentrated fish oil Emulsions using dual channel microfluidization impact of droplet concentration on physical properties and lipid oxidation
Journal of Agricultural and Food Chemistry, 2016Co-Authors: Eric A Decker, David Julian McclementsAbstract:Chemically unstable lipophilic bioactives, such as polyunsaturated lipids, often have to be encapsulated in Emulsion-based delivery systems before they can be incorporated into foods, supplements, and pharmaceuticals. The objective of this study was to develop Highly Concentrated Emulsion-based fish oil delivery systems using natural emulsifiers. Fish oil-in-water Emulsions were fabricated using a Highly efficient dual-channel high-pressure microfluidizer. The impact of oil concentration on the formation, physical properties, and oxidative stability of fish oil Emulsions prepared using two natural emulsifiers (quillaja saponins and rhamnolipids) and one synthetic emulsifier (Tween-80) was examined. The mean droplet size, polydispersity, and apparent viscosity of the fish oil Emulsions increased with increasing oil content. However, physically stable Emulsions with high fish oil levels (30 or 40 wt %) could be produced using all three emulsifiers, with rhamnolipids giving the smallest droplet size (d < 160...
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Fabrication of Concentrated Fish Oil Emulsions Using Dual-Channel Microfluidization: Impact of Droplet Concentration on Physical Properties and Lipid Oxidation
2016Co-Authors: Fuguo Liu, Eric A Decker, Zhenbao Zhu, Xiang Luo, Long Bai, Yanxiang Gao, David Julian McclementsAbstract:Chemically unstable lipophilic bioactives, such as polyunsaturated lipids, often have to be encapsulated in Emulsion-based delivery systems before they can be incorporated into foods, supplements, and pharmaceuticals. The objective of this study was to develop Highly Concentrated Emulsion-based fish oil delivery systems using natural emulsifiers. Fish oil-in-water Emulsions were fabricated using a Highly efficient dual-channel high-pressure microfluidizer. The impact of oil concentration on the formation, physical properties, and oxidative stability of fish oil Emulsions prepared using two natural emulsifiers (quillaja saponins and rhamnolipids) and one synthetic emulsifier (Tween-80) was examined. The mean droplet size, polydispersity, and apparent viscosity of the fish oil Emulsions increased with increasing oil content. However, physically stable Emulsions with high fish oil levels (30 or 40 wt %) could be produced using all three emulsifiers, with rhamnolipids giving the smallest droplet size (d < 160 nm). The stability of the Emulsions to lipid oxidation increased as the oil content increased. The oxidative stability of the Emulsions also depended on the nature of the emulsifier coating the lipid droplets, with the oxidative stability decreasing in the following order: rhamnolipids > saponins ≈ Tween-80. These results suggest that rhamnolipids may be particularly effective at producing Emulsions containing high concentrations of ω-3 polyunsaturated fatty acids-rich fish oil
Arup R. Bhattacharyya - One of the best experts on this subject based on the ideXlab platform.
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Effect of Organic Modification on Multiwalled Carbon Nanotube Dispersions in Highly Concentrated Emulsions.
ACS Omega, 2019Co-Authors: Sharu Bhagavathi Kandy, George P. Simon, Wenlong Cheng, Johann Zank, Kei Saito, Arup R. BhattacharyyaAbstract:Highly Concentrated water-in-oil Emulsions incorporating multiwalled carbon nanotubes (MWCNTs) are prepared. Homogeneous and selective dispersions of MWCNTs throughout the oil phase of the Emulsions are investigated. The practical insolubility of carbon nanotubes (CNTs) in aqueous and organic media necessitates the disentanglement of CNT “agglomerates” through the utilization of functionalized CNTs. The design and synthesis of two tetra-alkylated pyrene derivatives, namely, 1,3,6,8-tetra(oct-1-yn-1-yl)pyrene (TOPy) and 1,3,6,8-tetra(dodec-1-yn-1-yl)pyrene (TDPy), for the noncovalent organic modification of MWCNTs are reported. The modifier molecules are designed in such a manner that they facilitate an improved dispersion of individualized MWCNTs in the continuous-oil phase of the Highly Concentrated Emulsion (HCE). Transmission electron microscopic analyses suggest that the alkylated pyrene molecules are adsorbed on the MWCNT surface, and their adsorption eventually results in the debundling of MWCNT agg...
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Effect of Organic Modification on Multiwalled Carbon Nanotube Dispersions in Highly Concentrated Emulsions
2019Co-Authors: Sharu Bhagavathi Kandy, George P. Simon, Wenlong Cheng, Johann Zank, Kei Saito, Arup R. BhattacharyyaAbstract:Highly Concentrated water-in-oil Emulsions incorporating multiwalled carbon nanotubes (MWCNTs) are prepared. Homogeneous and selective dispersions of MWCNTs throughout the oil phase of the Emulsions are investigated. The practical insolubility of carbon nanotubes (CNTs) in aqueous and organic media necessitates the disentanglement of CNT “agglomerates” through the utilization of functionalized CNTs. The design and synthesis of two tetra-alkylated pyrene derivatives, namely, 1,3,6,8-tetra(oct-1-yn-1-yl)pyrene (TOPy) and 1,3,6,8-tetra(dodec-1-yn-1-yl)pyrene (TDPy), for the noncovalent organic modification of MWCNTs are reported. The modifier molecules are designed in such a manner that they facilitate an improved dispersion of individualized MWCNTs in the continuous-oil phase of the Highly Concentrated Emulsion (HCE). Transmission electron microscopic analyses suggest that the alkylated pyrene molecules are adsorbed on the MWCNT surface, and their adsorption eventually results in the debundling of MWCNT agglomerates. Fourier transform infrared, Raman, and fluorescence spectroscopic analyses confirm the π–π interaction between the alkylated pyrene molecules and MWCNTs. The noncovalent modification significantly improves the effective debundling and selective dispersion of MWCNTs in HCEs
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Development of microstructure and evolution of rheological characteristics of a Highly Concentrated Emulsion during emulsification
Colloids and Surfaces A: Physicochemical and Engineering Aspects, 2017Co-Authors: B. K. Sharu, George P. Simon, Wenlong Cheng, Johann Zank, Arup R. BhattacharyyaAbstract:Abstract The refining characteristics of the Highly Concentrated water-in-oil Emulsion, which are used as ‘Emulsion precursors’ for the preparation of Emulsion explosives, were investigated to elucidate the manner in which the refining time influences its microstructure and rheological behaviour. The development of microstructure at various stages of the emulsification process has been studied in detail and an empirical correlation between the characteristic droplet size and refining time has been proposed. The evolution of rheological characteristics of the Emulsion during the microstructure refinement has been investigated through different protocols of the dynamic and steady-state rheology. An extended refining led to a finer microstructure and resulted in an increase in the elastic modulus, yield stress and viscosity of the Emulsion. The droplet size dependency of the elasticity and the yield stress during the refining have also been discussed. The network structure of the dispersed phase, the droplet size and the corresponding interdroplet interactions all govern the rheological characteristics of the final Emulsion.