The preparation of gold nanoparticles in triton N-42 reverse micelles after preliminary concentration from acid sulfate-chloride solutions

Булавченко, А. И.; Арымбаева, А. Т.; Булавченко, О. А.; Татарчук, В. В.; Петрова, Н. И.

doi:10.1134/s0036024406120181

Cited by 6 publications

(4 citation statements)

References 6 publications

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“…The electrophoretic-concentration technique can be applied to determine metals in diluted aqueous solutions (in combination with liquid−liquid (micellar) extraction) . It can also be used to obtain an electrophoretic hydrophobic concentrate of metal nanoparticles (≥1 mol/L) as a source of production of nanomaterials.…”

Section: Resultsmentioning

confidence: 99%

Electrokinetic Potential of Nanoparticles in Reverse AOT Micelles: Photometric Determination and Role in the Processes of Heterocoagulation, Separation, and Concentration

Булавченко

Popovetsky

2009

Langmuir

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A simple photometric method for determining the electrophoretic mobility of nano- and microparticles in reverse micelles and in solvents with a low dielectric permittivity (2-5) has been developed. The method is based on the use of a thermostatically controlled diaphragm-based optical cell (length 2 cm) with three vertical plane-parallel electrodes (2 x 3 cm; interelectrode gap, 0.3 cm) placed into a standard photocolorimeter. When an electrostatic field (100-600 V) is applied, the particles begin to move away from the electrode of the same polarity. The path traveled by the particles for a given time (2-30 s) is calculated from the change in the optical density of the solution in the near-electrode zone. The electrophoretic potential of nanoparticles in the model systems, calculated from the values of electrophoretic mobility by Huckel-Onsager theory, varied from 70 (Ag nanoparticles in AOT micelles in decane) to -73 mV (aggregated SiO(2) nanoparticles in a decane-chloroform mixture). Calculations by the classical Deryaguin-Landau-Verwey-Overbeek (DLVO) theory determined the contribution of the electrostatic interaction to the stability of the studied systems. We have shown that the surface charge of nanoparticles permits: (1) an electrophoretic concentration of the charged nanoparticles (Ag) with an enrichment factor of up to 10(4), (2) the separation of nanoparticles with zero (C(60)) and a high (Ag) electrokinetic potentials, and (3) the formation of electrostatically bound aggregates (Ag-SiO(2)) through the heterocoagulation of oppositely charged particles.

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Section: Resultsmentioning

confidence: 99%

Electrokinetic Potential of Nanoparticles in Reverse AOT Micelles: Photometric Determination and Role in the Processes of Heterocoagulation, Separation, and Concentration

Булавченко

Popovetsky

2009

Langmuir

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“…The increased enrichment factors are of interest for the development of effective nanotechnologies to concentrate noble metals from depleted raw materials. Gold(III) can be extracted from diluted aqueous solutions into the micellar phase with the help of liquid extraction. , Our studies have shown that the extraction of gold(III) with AOT micelles from acidic sulfate-chloride media can be performed with a distribution coefficient of as high as ∼8. Such values do allow the transfer of gold(III) from the aqueous into the organic phase, but they are insufficient for the additional extractive concentration.…”

Section: Discussionmentioning

confidence: 99%

“…Such a complicated procedure was necessary because of the difficulties in taking small volumes of the liquid spread over the large surface of the horizontal electrode. Then, 5 µL of the cathode concentrate were taken with a Hamilton syringe, diluted 100 to 500 times with a dry micellar solution, and analyzed photomertrically (using the procedure developed in ref 21) or by flame atomic absorption on a PerkinElmer spectrophotometer, model 303. In all cases, the sample temperature was controlled by a thermostatted water bath to ( 0.5 °C.…”

Section: Methodsmentioning

confidence: 99%

Electrophoretic Concentration of Nanoparticles of Gold in Reversed Micellar Solutions of AOT

Булавченко

Pletnev

2008

J. Phys. Chem. C

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The electrophoretic mobility of nanoparticles of gold in reversed micelles of AOT was determined, and the nanoparticle electrokinetic potential was calculated. The electrokinetic potential of the particles decreased from 43 to 17 mV with the fall in the solubilization capacity from 1 to 0.2 vol. %. Correspondingly, the hydrodynamic radius decreased from 2.9 to 1.8 nm. On the basis of the electrokinetic studies, a new concentration method was developed, allowing concentration of metal particles with an enrichment factor of ∼10 3 . A simple model of the concentration has been proposed as a process of electrophoretic separation of micelles with gold nanoparticles from the empty ones. The limiting gold concentration in the liquid cathode concentrate (∼1 mol/L) and the concentrate volume have been calculated depending on the organic-phase volume, the solubilization capacity of the micellar solution, and the initial metal ion concentration.

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“…There are various methods for synthesizing gold nanoparticles, such as arc discharge [8], two phase synthesis [9], one phase synthesis in organic solvent [10], photochemistry [11,12], reverse micelles [13][14][15], radiolysis [16], electrochemical methods [17][18][19][20], and sonochemical methods [21,22]. A relatively recent development has been the use of the reducing agent which also acts as the 'nanoparticle capping species', and this technique has been demonstrated using amino acids [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Environmentally benign synthesis of positively charged, ultra-low sized colloidal gold in universal solvent

Kumar

Saxena

et al. 2014

Adv. Nat. Sci: Nanosci. Nanotechnol.

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A simple, single-step, one pot method was developed for the synthesis of monodispersed, ultralow sized, water-dispersible, stable, positively charged gold nanoparticles using the branched polyethlyneimine (PEI) in an aqueous media. Sizes of the gold nanoparticles have been tuned by adjusting the concentration of PEI and the gold salt. Formation of gold nanoparticles has been evidenced using various characterization techniques such as quasi-elastic light scattering (QELS), transmission electron microscopy (TEM), x-ray diffraction (XRD), energy dispersive x-ray (EDX) and spectroscopy and UV-visible spectrophotometer.

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The preparation of gold nanoparticles in triton N-42 reverse micelles after preliminary concentration from acid sulfate-chloride solutions

Cited by 6 publications

References 6 publications

Electrokinetic Potential of Nanoparticles in Reverse AOT Micelles: Photometric Determination and Role in the Processes of Heterocoagulation, Separation, and Concentration

Electrokinetic Potential of Nanoparticles in Reverse AOT Micelles: Photometric Determination and Role in the Processes of Heterocoagulation, Separation, and Concentration

Electrophoretic Concentration of Nanoparticles of Gold in Reversed Micellar Solutions of AOT

Environmentally benign synthesis of positively charged, ultra-low sized colloidal gold in universal solvent

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