Oleic acid adsorption-desorption isotherms on the surface of high-dispersity ferrites from a solution in carbon tetrachloride

Balmasova, O. V.; Korolev, V. V.; Yashkova, V. I.

doi:10.1134/s0036024410010152

Cited by 6 publications

(10 citation statements)

References 2 publications

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“…This work continues the investigation in [3] and deals with the processes of adsorption and desorption of linoleic and linolenic acids from solutions in carbon tetrachloride on the surface of highly dispersed man ganese and cooper ferrites.…”

Section: Introductionmentioning

confidence: 81%

“…Highly dispersed manganese (MnFe 2 O 4 ) and cop per (CuFe 2 O 4 ) ferrites were synthesized by chemical condensation, as described in [3].…”

Section: Methodsmentioning

confidence: 99%

“…Our quantitative analysis was based on the change in the integral intensity of the absorp tion band with a maximum at 2992 cm -1 for stretching vibrations of the -СН 2 group of the fatty acids. Prede termined linear calibration dependences of the inte gral intensity of the band on the acid concentration in [3]. Before sampling in the spectrophotometer cell, equilibrium solutions were separated from magnetic adsorbent particles with the adsorbed acid by decanta tion of the carbon tetrachloride-ferrite suspension using a magnetic field.…”

Section: Methodsmentioning

confidence: 99%

“…Once the adsorption process in the adsorption cell was completed, the acid was desorbed from the ferrite surface in the same cell using the procedure in [3]. Equilibrium concentrations of the acids in the course of desorption (after dilution of the system with pure carbon tetrachloride and establishing equilibrium in the system) were determined by the abovementioned spectrophotometric method.…”

Section: Methodsmentioning

confidence: 99%

“…Processes of the adsorption and desorption of oleic acid from solu tions in carbon tetrachloride on the surface of manga nese and copper ferrites were investigated in [3]. It was established that solute and solvent molecules compete for surface active sites of the adsorbent.…”

Section: Introductionmentioning

confidence: 99%

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Adsorption isotherms of linoleic and linolenic acids from solutions in carbon tetrachloride on surfaces of highly dispersed manganese and copper ferrites

Balmasova

Korolev

Ramazanova

2012

Russ. J. Phys. Chem.

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A comparative study of adsorption-desorption isotherms of linoleic and linolenic acids from solutions in carbon tetrachloride on surfaces of manganese and copper ferrites is performed by means of equi librium adsorption. Adsorption isotherms of fatty acids are described in terms of the theory of volume filling of micropores, and the values of the limiting adsorption, the characteristic adsorption energy, and the pore space volume are calculated. It is established that the limiting adsorption values of linoleic and linolenic acids from solutions in carbon tetrachloride on a copper ferrite surface are higher than on a manganese ferrite sur face. It is shown that the adsorption-desorption isotherms have a hysteresis loop.

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Section: Introductionmentioning

confidence: 81%

“…Highly dispersed manganese (MnFe 2 O 4 ) and cop per (CuFe 2 O 4 ) ferrites were synthesized by chemical condensation, as described in [3].…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Adsorption isotherms of linoleic and linolenic acids from solutions in carbon tetrachloride on surfaces of highly dispersed manganese and copper ferrites

Balmasova

Korolev

Ramazanova

2012

Russ. J. Phys. Chem.

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Oleate coating of iron oxide nanoparticles in aqueous systems: the role of temperature and surfactant concentration

et al. 2016

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Coating magnetic nanoparticles (MNPs) with sodium oleate (SO) is known to be an excellent method to create biocompatible, stable colloids with a narrow size distribution. However, the mechanism of oleate adsorption on the MNP surface in aqueous systems, as well as its influence on colloidal stability, is not yet fully understood. In this context, we present here a physico-chemical study to provide a deeper understanding of surfactant interaction mechanisms with nanoparticles. We examined the effect of temperature and the SO/MNP ratio (w/w) on the adsorption process in water and observed the existence of a maximum for the adsorbed oleate amount at lower temperatures, whereas at higher temperatures, the isotherm can be adapted to the Langmuir model with constant capacity after saturation. The oleate load on the MNP surface was quantified using reversed-phase high-performance liquid chromatography measurements of samples in solution. The thermogravimetric analyses of the solid residues together with infrared spectroscopy analyses indicate a bilayer-similar structure at the MNP/water interface even for low oleate loads. The oleate interacts with the iron oxide surface through a bidentate coordination of the carboxyl group. Zeta potential measurements demonstrate the high stability of the coated system. The maximal oleate load per unit mass of MNPs reaches approximately 0.35 g oleate g MNP -1 .

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Three-phase heterostructures f-NiFe 2 O 4 /PANI/PI EMI shielding fabric with high Microwave Absorption Performance

Wang

2017

Applied Surface Science

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Oleic acid adsorption-desorption isotherms on the surface of high-dispersity ferrites from a solution in carbon tetrachloride

Cited by 6 publications

References 2 publications

Adsorption isotherms of linoleic and linolenic acids from solutions in carbon tetrachloride on surfaces of highly dispersed manganese and copper ferrites

Adsorption isotherms of linoleic and linolenic acids from solutions in carbon tetrachloride on surfaces of highly dispersed manganese and copper ferrites

Oleate coating of iron oxide nanoparticles in aqueous systems: the role of temperature and surfactant concentration

Three-phase heterostructures f-NiFe 2 O 4 /PANI/PI EMI shielding fabric with high Microwave Absorption Performance

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