The impact of the polar core size and external organic media composition on micelle–micelle interactions: the effect on gold nanoparticle synthesis

Gutierrez, Jorge A.; Luna, María Eugenia; Correa, N. Mariano; Silber, Juana J.; Falcone, R. Darío

doi:10.1039/c5nj01126d

Cited by 26 publications

(20 citation statements)

References 48 publications

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“…Organic solvent is both the extractant of target analytes in 2p‐HF‐LPME or 3p‐HF‐LPME‐RM and the media forming reverse micelle in 3p‐HF‐LPME‐RM. Aliquat 336 in different organic solvents can form various structures and sizes of reverse micelles . In this study, Aliquat 336 reverse micelles respectively prepared by dissolving certain amount in n ‐hexanol, n‐ heptanol, n ‐octanol, n ‐nonanol, and n ‐decanol were applied to extract the target analytes, and the results were compared with those of 2p‐HF‐LPME.…”

Section: Resultsmentioning

confidence: 99%

Comparison of three‐phase hollow fiber liquid‐phase microextraction based on reverse micelle with conventional two‐phase hollow fiber liquid‐phase microextraction and their applications for analysis of cinnamic acids in traditional Chinese medicines

Liu

Zhang

Wang

et al. 2019

J of Separation Science

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A novel three‐phase hollow fiber liquid‐phase microextraction was developed based on reverse micelle as extraction solvent and acceptor phase, and compared with conventional two‐phase hollow fiber liquid‐phase microextraction. Both procedures were used in the extraction and concentration of four cinnamic acids (caffeic acid, p‐hydroxycinnamic acid, ferulic acid, and cinnamic acid) in traditional Chinese medicines prior to high‐performance liquid chromatography analysis. Parameters affecting the two procedures were investigated and optimized to obtain the optimum enrichment factors. The mechanism of the developed procedure was explored and elucidated by comparison with conventional two‐phase hollow fiber liquid‐phase microextraction. Under the optimized conditions, the analytes’ enrichment factors were between 50 and 118 for the proposed procedure, and 31–96 for conventional two‐phase mode. Satisfactory linear ranges (r2 ≥ 0.99), detection limits (0.1–0.6 ng/mL), precisions (<9.2%), and accuracies (recoveries: 80–123.1%) were observed for the two procedures. The results showed that the enrichment capacity of the proposed procedure for the cinnamic acids is better than that of conventional two‐phase procedure, and both are eco‐friendly, simple, and effective for the enrichment and detection of cinnamic acids in traditional Chinese medicines.

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Section: Resultsmentioning

confidence: 99%

Comparison of three‐phase hollow fiber liquid‐phase microextraction based on reverse micelle with conventional two‐phase hollow fiber liquid‐phase microextraction and their applications for analysis of cinnamic acids in traditional Chinese medicines

Liu

Zhang

Wang

et al. 2019

J of Separation Science

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“…60 Furthermore, the micelle−micelle interactions and the water structure inside reverse micelles can be altered by the type or composition of the nonpolar phase. 13,60 Thus, it was found that when aromatic solvents are used, intermicellar interactions are weaker than in aliphatic solvents. As a consequence of this fact, a notable impact on the practical applications of reverse micelles as nanoreactors can be produced.…”

Section: Grmentioning

confidence: 99%

“…As a consequence of this fact, a notable impact on the practical applications of reverse micelles as nanoreactors can be produced. 13,60 For example, in the synthesis of nanoparticles, one of the key steps that controls the synthetic pathway is the coalescence process. In this sense, the intermicelle interactions can be controlled by the nature of the nonpolar solvent.…”

Section: Grmentioning

confidence: 99%

Influence of the AOT Counterion Chemical Structure on the Generation of Organized Systems

et al. 2020

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The impact of the imidazolium counterion structure on the organized systems formed by the surfactant 1,4-bis-2ethylhexylsulfosuccinate, AOT, both in aqueous solutions and in nonpolar solvents is investigated. With this in mind, we investigated if the ionic liquid-like (IL-like) surfactant 1-ethyl-3methylimidazolium 1,4-bis-2-ethylhexylsulfosuccinate, emim-AOT, forms direct micelles or vesicles in water. Dynamic light scattering, zeta potential, conductivity, fluorescence spectroscopy, and UV− visible spectroscopy measurements were performed to characterize the organized systems in aqueous solutions. We also studied the self-aggregation of emim-AOT, 1-butyl-3-methylimidazolium 1,4bis-2-ethylhexylsulfosuccinate, bmim-AOT, and of 1-hexyl-3methylimidazolium 1,4-bis-2-ethylhexylsulfosuccinate, hmim-AOT, in nonpolar solvents. The results obtained showed that the IL-like surfactant emim-AOT forms direct micelles in water, as sodium 1,4-bis-2-ethylhexylsulfosuccinate (Na-AOT) does. However, emim-AOT aggregates are larger, have a lower surface charge, are more stable, and have a more polar and less fluid micellar interface than Na-AOT micelles. It was also observed that emim-AOT and hmim-AOT form reverse micelles in nonpolar solvents. The size of the imidazolium cations dramatically influences the size of the reverse micelles and their ability to solubilize water.

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“…The synthesis of monometallic 50 and bimetallic NPs in RMs is described in the Supporting Information. This methodology is based in Brownian motion of RMs and in micelle−micelle interactions.…”

Section: ■ Experimental Sectionmentioning

confidence: 99%

High Antifungal Activity against Candida Species of Monometallic and Bimetallic Nanoparticles Synthesized in Nanoreactors

Gutierrez

Caballero

Diaz

et al. 2018

ACS Biomater. Sci. Eng.

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Among all novel challenges nowadays worldwide, infectious disease is probably one of the most important. It is wellknown that common treatments used include high doses of antibiotics, which are very invasive therapies for patients. These treatments are more intensive when the infection is related to multidrug resistant microorganisms. In this sense, in this work we report the use of reverse micelles to form less than 5 nm gold, silver, and gold−silver nanoparticles (NPs) with biological activity against five opportunistic Candida strains responsible of several diseases in human beings. As a result, we evaluate the interface properties and droplet−droplet interactions of micelles founding high fluidity in the polar head of the surfactant, necessary to form a flexible interaction channel in the "dimmer" micelle−micelle. In this condition, we form monodispersed, highly reactive NPs with sizes less than 5 nm with high antifungal activity against C. parapsilosis, C. Krusei, C. glabrata, C. guillermondii, and C. albicans, with minimum inhibitory concentrations (MIC 50 ) less than 0.7 ppm in all cases, the lowest reported to the best of our knowledge. These are very promising results to develop alternative therapies to treat fungal diseases in humans, animals, and plants, or to coat conventional surfaces in surgery rooms.

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The impact of the polar core size and external organic media composition on micelle–micelle interactions: the effect on gold nanoparticle synthesis

Abstract: An easy way to modulate reverse micelles as nanoreactors to produce different kinds of gold nanoparticles.

Cited by 26 publications

References 48 publications

Comparison of three‐phase hollow fiber liquid‐phase microextraction based on reverse micelle with conventional two‐phase hollow fiber liquid‐phase microextraction and their applications for analysis of cinnamic acids in traditional Chinese medicines

Comparison of three‐phase hollow fiber liquid‐phase microextraction based on reverse micelle with conventional two‐phase hollow fiber liquid‐phase microextraction and their applications for analysis of cinnamic acids in traditional Chinese medicines

Influence of the AOT Counterion Chemical Structure on the Generation of Organized Systems

High Antifungal Activity against Candida Species of Monometallic and Bimetallic Nanoparticles Synthesized in Nanoreactors

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