Recent advances in nanoparticle synthesis with reversed micelles

Eastoe, Julian; Hollamby, Martin J.; Hudson, Laura

doi:10.1016/j.cis.2006.11.009

Cited by 588 publications

(426 citation statements)

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“…The visual appearance of microemulsions does not change with time, inferring thermodynamic stability, a further distinguishing feature to other emulsions. These properties and features lead to applications of microemulsions as nanoreactors in chemical [1] and nanoparticle synthesis [2], as nanoparticle recovery vehicles [4], in soil remediation processes, enhanced oil recovery [5], pharmaceutical delivery [6], and engine oil and fuel additives [7].…”

Section: Introductionmentioning

confidence: 99%

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Effects of small ionic amphiphilic additives on reverse microemulsion morphology

Hatzopoulos

James

Rogers

et al. 2014

Journal of Colloid and Interface Science

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms Effects of small ionic amphiphilic additives on reverse microemulsion morphology Research Highlights Cylindrical morphologies of reverse microemulsions induced by small molecule hydrotropes.  Ellipsoidal droplets of high aspect ratio in reverse AOT microemulsions are induced by short chain alkanoate additives.  A cylinder to sphere transition in reverse AOT microemulsions is seen with increasing water content. . Microemulsion domain structures were investigated by small-angle neutron scattering (SANS), and these data were fitted by structural models to yield information on the shapes (spheres, ellipsoids or cylinders) and sizes of the nanodroplets. Effects of small ionic amphiphilic additives on reverse microemulsion morphology FindingsUnder the conditions of study hydrotrope chemical structure has a significant effect on microemulsion structure: sodium cyclohexanoate does not induce the formation of cylindrical/ellipsoidal nanodroplets, whereas the aromatic analogue sodium benzoate does. Furthermore, the short chain sodium hexanoate does not cause anisotropic microemulsions, but the more hydrophobic longer chain heptanoate and octanoate analogues do induce sphere-to-ellipsoid transitions. This study shows that underlying microemulsion structures can be tuned by hydrotropes, and that the strength of the effect can be identified with hydrotrope hydrophobicity in terms of the bulk aqueous phase cac.

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Section: Introductionmentioning

confidence: 99%

“…Microemulsions are more than often reported as spherical [2][3][4]. Axial elongation of microemulsions or reverse hydrated micelles (in the cases of low water content reverse phases) in oil media and supercritical CO2 is of interest for control over viscosity.…”

Section: Introductionmentioning

confidence: 99%

Effects of small ionic amphiphilic additives on reverse microemulsion morphology

Hatzopoulos

James

Rogers

et al. 2014

Journal of Colloid and Interface Science

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“…Because both emulsions are thermodynamically unstable, overcoming this requires an emulsifying agent such as a surfactant. Recently, there has been interest in surfactant-stabilized emulsions with droplet diameters in the nanoscale range for unique applications in drug delivery (1,2) and oil recovery (3,4) and as nanoreactors to produce materials ranging from polymers to quantum dots (5). Regular or reverse emulsions with droplet diameters in the range of 10-1,000 nm are called nanoemulsions.…”

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confidence: 99%

Molecular characterization of water and surfactant AOT at nanoemulsion surfaces

Hensel

Carpenter

Ciszewski

et al. 2017

Proc. Natl. Acad. Sci. U.S.A.

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Nanoemulsions and microemulsions are environments where oil and water can be solubilized in one another to provide a unique platform for many different biological and industrial applications. Nanoemulsions, unlike microemulsions, have seen little work done to characterize molecular interactions at their surfaces. This study provides a detailed investigation of the near-surface molecular structure of regular (oil in water) and reverse (water in oil) nanoemulsions stabilized with the surfactant dioctyl sodium sulfosuccinate (AOT). Vibrational sum-frequency scattering spectroscopy (VSFSS) is used to measure the vibrational spectroscopy of these AOT stabilized regular and reverse nanoemulsions. Complementary studies of AOT adsorbed at the planar oil-water interface are conducted with vibrational sum-frequency spectroscopy (VSFS). Jointly, these give comparative insights into the orientation of interfacial water and the molecular characterization of the hydrophobic and hydrophilic regions of AOT at the different oil-water interfaces. Whereas the polar region of AOT and surrounding interfacial water molecules display nearly identical behavior at both the planar and droplet interface, there is a clear difference in hydrophobic chain ordering even when possible surface concentration differences are taken into account. This chain ordering is found to be invariant as the nanodroplets grow by Ostwald ripening and also with substitution of different counterions (Na:AOT, K:AOT, and Mg:AOT) that consequently also result in different sized nanoparticles. The results paint a compelling picture of surfactant assembly at these relatively large nanoemulsion surfaces and allow for an important comparison of AOT at smaller micellar (curved) and planar oil-water interfaces.nanoemulsions | oil-water interfaces | vibrational sum-frequency scattering spectroscopy | surface spectroscopy | surfactants W e are all familiar with the adage that "oil and water do not mix," but of course, it depends upon the definition of "mix." Emulsions are an important special case, where the oil is dispersed as tiny droplets in the aqueous phase, taxonomically called a regular emulsion, or where the water is dispersed as tiny droplets throughout the oil phase, called a reverse emulsion. Because both emulsions are thermodynamically unstable, overcoming this requires an emulsifying agent such as a surfactant. Recently, there has been interest in surfactant-stabilized emulsions with droplet diameters in the nanoscale range for unique applications in drug delivery (1, 2) and oil recovery (3, 4) and as nanoreactors to produce materials ranging from polymers to quantum dots (5). Regular or reverse emulsions with droplet diameters in the range of 10-1,000 nm are called nanoemulsions. Little is known about the processes or molecular structures that result in their stability via surfactants. Even less is known about the structure-function relationship, which is crucial to determine the best surfactant for a given nanoemulsion application. Their utility hinges on a ...

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“…Previous studies reveal that a strong reducing agent such as sodium borohydride resulted in small particle size that was somewhat mono-dispersed and the generation of larger particle was difficult to control in this method. On the other hand, weaker reducing agents resulted in decreased rate of reduction and particle size distribution over a broad range [3][4][5] .…”

Section: Introductionmentioning

confidence: 99%

Water Extract of Piper Nigrum Seed Assisted Synthesis of Silver Nanoparticles and Reduction of Various Nitro Compounds by NaBH4 in the Presence of AgNPs as a Catalyst

2018

Chem Sci Trans

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An attempt has been made for eco-friendly synthesis of silver nanoparticles by water extract of Piper nigrum seed. Formation of AgNPs and their morphology was confirmed by using different advanced characterization techniques such as UV-Visible spectroscopy, XRD and FE-SEM images of AgNPs. Further we wish to report for the first time reduction of various nitro compounds to corresponding amines by NaBH 4 in the presence of AgNPs as a catalyst. After reaction course, AgNPs can be recycled and reused without any apparent loss of activity which makes this process cost effective and hence eco-friendly. The structures of all the corresponding reduced products were confirmed by comparing their IR, 1 H NMR, spectra with the authentic samples.

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Recent advances in nanoparticle synthesis with reversed micelles

Cited by 588 publications

References 146 publications

Effects of small ionic amphiphilic additives on reverse microemulsion morphology

Effects of small ionic amphiphilic additives on reverse microemulsion morphology

Molecular characterization of water and surfactant AOT at nanoemulsion surfaces

Water Extract of Piper Nigrum Seed Assisted Synthesis of Silver Nanoparticles and Reduction of Various Nitro Compounds by NaBH4 in the Presence of AgNPs as a Catalyst

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