Preparation of W/O nanoemulsion using tandem acoustic emulsification and its novel utilization as a medium for phase-transfer catalytic reaction

Nakabayashi, Koji; Yanagi, Hiroshi; Atobe, Mahito

doi:10.1039/c4ra09452b

Cited by 11 publications

(13 citation statements)

References 19 publications

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“…39 Surfactants favor the preparation of nanoemulsion with smaller droplets to increase the amount of adsorption around the oil-water interface of the droplet and to reduce the internal tension of the system. 40,41 Thereby, when the concentration of surfactant ranges from 4% to 6%, larger droplets are obtained, because the concentration is very low to achieve the necessary stability of the system. When surfactant concentration ranges from 8% to 10%, the droplet diameters of the nanoemulsion do not vary greatly and are stable aer fresh preparation.…”

Section: Evaluation Of Stabilitymentioning

confidence: 99%

Preparation of eugenol nanoemulsions for antibacterial activities

Gao

Yan

et al. 2022

RSC Adv.

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Section: Evaluation Of Stabilitymentioning

confidence: 99%

Preparation of eugenol nanoemulsions for antibacterial activities

Gao

Yan

et al. 2022

RSC Adv.

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“…transesterification for the production of biodiesel, hydrolysis for degradation of compounds 85 including polymers, 86 acid or base-catalyzed methanolysis, 87 oxidative desulfurization, 88 demulsification 89 and nanoemulsification, 90 amongst others). transesterification for the production of biodiesel, hydrolysis for degradation of compounds 85 including polymers, 86 acid or base-catalyzed methanolysis, 87 oxidative desulfurization, 88 demulsification 89 and nanoemulsification, 90 amongst others).…”

Section: Ultrasound Phase Transfer Catalysismentioning

confidence: 99%

Ultrasonically treated liquid interfaces for progress in cleaning and separation processes

Radziuk

Möhwald

2016

Phys. Chem. Chem. Phys.

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Ultrasound and acoustic cavitation enable ergonomic and eco-friendly treatment of complex liquids with outstanding performance in cleaning, separation and recycling of resources. A key element of ultrasonic-based technology is the high speed of mixing by streams, flows and jets (or shock waves), which is accompanied by sonochemical reactions. Mass transfer across the phase boundary with a great variety of catalytic processes is substantially enhanced through acoustic emulsification. Encapsulation, separation and recovery of liquids are fast with high production yield if applied by ultrasound. Here we discuss the state of knowledge of these processes by ultrasound and acoustic cavitation from a perspective of a physico-chemical model in order to predict and control the outcome. We focus on the physical interpretation and quantification of ultrasonic parameters and properties of liquids to understand the chemistry of liquid/liquid interfaces in acoustic fields. The roles of thermodynamic enthalpy and entropy (incl. Laplace and osmotic pressure) in the context of sonochemical reactions (separation, catalysis, degradation, cross-linking, ion exchange and phase transfer) are outlined. The synergy of ultrasound and electric fields or continuous flow chemistry for cleaning and separation via emulsification is highlighted by specific strategies involving polymers and ultrasonic membranes.

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“…Ultrasonic irradiation allows for the preparation of stable emulsions without the need for surfactants, simply by the use of mechanical forces generated from acoustic cavitation at the liquid/liquid phase boundaries. [30][31][32][33][34][35] Acoustic (ultrasonic) emulsication is regarded as a powerful method for the rapid production of environmentally benign emulsions, [35][36][37][38] which upon further treatment under polymerization conditions can afford surfactant-free PNPs.…”

Section: 8mentioning

confidence: 99%

Surfactant-free synthesis of sub-100 nm poly(styrene-co-divinylbenzene) nanoparticles by one-step ultrasonic assisted emulsification/polymerization

et al. 2015

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The synthesis of sub-100 nm polymeric nanoparticles in a surfactant-free form is currently very challenging due to the oil nanoemulsion instability in polar solvents and in the absence of stabilizers. Here we report for the first time the surfactant-free synthesis method of poly(styrene-co-divinylbenzene) nanoparticles in an aqueous environment using ultrasonic radiation. This method involves emulsification of the monomers mixture in water, followed by free-radical polymerization under pulsed or continuous acoustic fields. The local energy produced in water by cavitation effects was sufficient to: (1) generate and stabilize the monomer nanoemulsion due to mechanical forces, and (2) drive the radical polymerization due to the heat generated. The average size of the final polymer nanoparticles obtained depended: (i) inversely on the monomer/water interfacial energy, emulsification power, and (ii) directly on temperature, amount of initiator and monomer solubility. The polymer nanoparticle size distribution and shape was considerably improved upon the addition of a co-polymerizable surfactant.

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Preparation of W/O nanoemulsion using tandem acoustic emulsification and its novel utilization as a medium for phase-transfer catalytic reaction

Abstract: We have successfully demonstrated that a W/O nanoemulsion prepared by the tandem acoustic emulsification is an extremely useful medium for enhancing the rate of phase-transfer catalytic reactions.

Cited by 11 publications

References 19 publications

Preparation of eugenol nanoemulsions for antibacterial activities

Preparation of eugenol nanoemulsions for antibacterial activities

Ultrasonically treated liquid interfaces for progress in cleaning and separation processes

Surfactant-free synthesis of sub-100 nm poly(styrene-co-divinylbenzene) nanoparticles by one-step ultrasonic assisted emulsification/polymerization

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