Modeling of nanoparticles formation by mixing of two reactive microemulsions

Kumar, Amoop; Hota, Garudadhwaj; Mehra, Anurag; Khilar, Kartic C.

doi:10.1002/aic.10137

Cited by 36 publications

(7 citation statements)

References 36 publications

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“…The dynamics of nanoparticle formation in water-in-oil MEs is known to depend on various parameters and has been the subject of numerous experimental and simulation studies with the goal of improving the prediction of the final particle size and particle size distribution. − Chemical reactions through the intermicellar exchange of dissolved salts first assume the coalescence of micelles, followed by the reaction and exchange of reactants and product molecules in the resulting fused dimer. In most ionic reactions, the interdroplet exchange of reactants is considered to be slower than the chemical reaction rate so that product molecules are already formed within the dimer itself before it undergoes fission.…”

Section: Resultsmentioning

confidence: 99%

In Situ Crystallization and Growth Dynamics of Acentric Iron Iodate Nanocrystals in w/o Microemulsions Probed by Hyper-Rayleigh Scattering Measurements

et al. 2010

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A detailed experimental investigation of the formation mechanisms of acentric iron iodate [Fe(IO 3 ) 3 ] nanocrystals in AOT-based reverse micelles according to the water-in-oil (w/o) microemulsion (ME) composition and temperature was performed. A low chemical reaction rate was first demonstrated by means of UV-vis absorption spectroscopy. Attainment of iron iodate crystalline nanorods was then attributed to an oriented aggregation mechanism of 10-20-nm amorphous primary nanoparticles. As for the intermicellar exchange of reactants, the aggregation mechanism was also found to be determined by the ME composition because clear effects of the surfactant and reactant concentrations, the nature of the oil phase, and the water droplet size were observed. Moreover, a combination of dynamic light scattering, X-ray diffraction, and transmission electron microscopy experiments revealed that hyper-Rayleigh scattering is a fast, valuable, and nondestructive alternative to probe, in real time, the crystallization and formation dynamics of acentric nanoparticles in microemulsions. This experimental approach can be extended to studies dealing with the formation of metal nanoparticles for which scattering of second-harmonic light is readily observed.

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Section: Resultsmentioning

confidence: 99%

In Situ Crystallization and Growth Dynamics of Acentric Iron Iodate Nanocrystals in w/o Microemulsions Probed by Hyper-Rayleigh Scattering Measurements

et al. 2010

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“…This is determined by the encounter rate factor, γ, which depends on film flexibility. 21 , 87 A number of other factors govern the fusion–fission process of the microemulsion system such as the volume fraction ϕ, the MED size, W 0 (water-to-surfactant molar ratio), concentration of reactants, temperature, critical nucleus n *, etc. 21 , 22 , 30 , 88 , 89 Figure 1 B depicts a single RM system, where one of the reagents is added as an MED and the other is present in solution form.…”

Section: Reverse Micelles As Nanoreactorsmentioning

confidence: 99%

“…Therefore, once the dimer is formed, the exchange of reactants occurs through the nanochannels and nucleation starts instantly at the micellar edges following the known growth modelfrom the boundary to the core. , Every droplet collision does not result in dimer formation. This is determined by the encounter rate factor, γ, which depends on film flexibility. , A number of other factors govern the fusion–fission process of the microemulsion system such as the volume fraction ϕ, the MED size, W 0 (water-to-surfactant molar ratio), concentration of reactants, temperature, critical nucleus n *, etc. ,,,, Figure B depicts a single RM system, where one of the reagents is added as an MED and the other is present in solution form.…”

Section: Reverse Micelles As Nanoreactorsmentioning

confidence: 99%

Mechanistic Investigations of Growth of Anisotropic Nanostructures in Reverse Micelles

et al. 2021

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Tailoring the characteristics of anisotropic nanostructures like size, morphology, aspect ratio, and size dispersity is of extreme importance due to the unique and tunable properties including catalytic, optical, photocatalytic, magnetic, photochemical, electrochemical, photoelectrochemical, and several other physical properties. The reverse microemulsion (RM) method offers a useful soft-template and low-temperature procedure that, by variation of experimental conditions and nature of reagents, has proved to be extremely versatile in synthesis of nanostructures with tailored properties. Although many reports of synthesis of nanostructures by the RM method exist in the literature, most of the research studies carried out still follow the "hit and trial" method where the synthesis conditions, reagents, and other factors are varied and the resulting characteristics of the obtained nanostructures are justified on the basis of existing physical chemistry principles. Mechanistic investigations are scarce to generate a set of empirical rules that would aid in preplanning the RM-based synthesis of nanostructures with desired characteristics as well as make the process viable on an industrial scale. A consolidation of such research data available in the literature is essential for providing future directions in the field. In this perspective, we analyze the literature reports that have investigated the mechanistic aspects of growth of anisotropic nanostructures using the RM method and distil the essence of the present understanding at the nanoscale timescale using techniques like FCS and ultrafast spectroscopy in addition to routine techniques like DLS, fluorescence, TEM, etc.

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“…Several aspects of the process have been studied by stochastic simulations. Natarajan et al [39] Bandyopadhyaya et al [40] Kumar et al [41] as well as Jain and Mehra [42] assume complete mixing of coalescing droplets followed by redistribution of the reactants and products. In some cases, the size of the droplets is in the order of nanometers.…”

Section: Transfer To Engineeringmentioning

confidence: 99%

Population Balance Modeling and Opinion Dynamics—A Mutually Beneficial Liaison?

2018

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In this contribution, we aim to show that opinion dynamics and population balance modeling can benefit from an exchange of problems and methods. To support this claim, the Deffuant-Weisbuch model, a classical approach in opinion dynamics, is formulated as a population balance model. This new formulation is subsequently analyzed in terms of moment equations, and conservation of the first and second order moment is shown. Exemplary results obtained by our formulation are presented and agreement with the original model is found. In addition, the influence of the initial distribution is studied. Subsequently, the Deffuant-Weisbuch model is transferred to engineering and interpreted as mass transfer between liquid droplets which results in a more flexible formulation compared to alternatives from the literature. On the one hand, it is concluded that the transfer of opinion-dynamics problems to the domain of population balance modeling offers some interesting insights as well as stimulating challenges for the population-balance community. On the other hand, it is inferred that population-balance methods can contribute to the solution of problems in opinion dynamics. In a broad outlook, some further possibilities of how the two fields can possibly benefit from a close interaction are outlined.

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Modeling of nanoparticles formation by mixing of two reactive microemulsions

Cited by 36 publications

References 36 publications

In Situ Crystallization and Growth Dynamics of Acentric Iron Iodate Nanocrystals in w/o Microemulsions Probed by Hyper-Rayleigh Scattering Measurements

In Situ Crystallization and Growth Dynamics of Acentric Iron Iodate Nanocrystals in w/o Microemulsions Probed by Hyper-Rayleigh Scattering Measurements

Mechanistic Investigations of Growth of Anisotropic Nanostructures in Reverse Micelles

Population Balance Modeling and Opinion Dynamics—A Mutually Beneficial Liaison?

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