Sensitivity of potentiometric sensors based on Nafion®-type membranes and effect of the membranes mechanical, thermal, and hydrothermal treatments on the on their properties

Safronova, E. Yu.; Safronov, Dmitry; Lysova, A. A.; Паршина, А. В.; Бобрешова, О. В.; Pourcelly, G.; Yaroslavtsev, A. B.

doi:10.1016/j.snb.2016.09.010

Cited by 35 publications

(24 citation statements)

References 29 publications

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“…5. The strain rate used for testing the maximum allowable stress for Nafion® varies widely from 0.08 mm/min to 50 m/s [30, 31, 32]. Furthermore, the stress-strain of the Nafion®/7.5 ZrP were higher than Nafion® 117 membrane at a strain rate of 50 mm/min were 1737 kPa and 947 kPa, respectively as shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

The proton conductivity and mechanical properties of Nafion®/ ZrP nanocomposite membrane

Sigwadi

Dhlamini

Mokrani

et al. 2019

Heliyon

113

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Zirconium phosphates (ZrP) were incorporated into Nafion® 117 membrane by impregnating method to obtain a reduced methanol permeation and improved proton conductivity for fuel cell application. The mechanical properties and water uptake of Nafion® membrane incorporated with zirconium phosphates nanoparticles was more improvement when compared to the commercial Nafion® 117, due to the presence of phosphoric acid within the nanoparticles. The effect of ZrP nano filler on the membrane structural morphology and thermal properties were investigated by Fourier-transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), Thermal gravimetric analysis (TGA) and Scanning Electron Microscopy (SEM). The improved ion conductivity and decreased methanol permeability on the nanocomposite membranes showed a great potential for fuel cell applications. The nanocomposite membrane with high tensile strength was obtained due to the well dispersed zirconium phosphates within the Nafion® matrix.

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Section: Resultsmentioning

confidence: 99%

The proton conductivity and mechanical properties of Nafion®/ ZrP nanocomposite membrane

Sigwadi

Dhlamini

Mokrani

et al. 2019

Heliyon

113

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“…This is associated with the need for the development of individual approaches to the fixation of new materials in the sensor sheath and elimination of transmembrane fluxes from the reference solution. In [80,[96][97][98][99], for minimizing the ion fluxes through a membrane, it is proposed to substantially increase the distance between its boundaries with the reference and test solutions, due to which the response is determined by the Donnan potential (DP) at the boundary of the membrane with the test solution. This allows using perfluorinated sulfonic cation-exchange membranes (Nafion and MF-4SK) that are gradient-modified along the length in DP sensors for the determination of amino acids, vitamins, and drugs.…”

Section: Membranes For Electrochemical Sensorsmentioning

confidence: 99%

“…Hydrated inorganic oxides including those surface-modified by sulfur- [96] and nitrogen-containing [80,97] and hydrophobic hydrocarbon moieties [97], as well as acidic salts of heteropoly acids [98], are used as the dopants. The properties of membranes were also altered by thermal treatment at different humidities or using mechanical deformation [99]. The value of the response is determined by the processes of exchange and nonexchange sorption which occur upon the establishment of quasi-equilibrium at the membrane interface with the test solution.…”

Section: Membranes For Electrochemical Sensorsmentioning

confidence: 99%

“…The value of the response is determined by the processes of exchange and nonexchange sorption which occur upon the establishment of quasi-equilibrium at the membrane interface with the test solution. Increasing the number of sorption sites and selectivity of the membranes makes it possible to increase the accuracy and sensitivity of the determination of organic cations and zwitterions at pH < 7 and to decrease their detection limits [97][98][99]. At a low volume of the solution in the pores of hybrid membranes, the concentration of analyte ions in them turns out to be high, and their interaction with the functional groups of the membrane excludes some protons from the ion exchange, thus decreasing the influence of interfering ions on the response of the sensor.…”

Section: Membranes For Electrochemical Sensorsmentioning

confidence: 99%

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Prospects of Membrane Science Development

Apel

Бобрешова

Волков

et al. 2019

Membr. Membr. Technol.

127

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Membranes are widely used in modern technology. The demand for different types of membranes and membrane processes is increasing every year. This review summarizes the current state of the art and prospects of membrane science developments including membrane materials for gas separation, pervaporation, and pressure-driven membrane processes; ion-exchange, hybrid, and track-etched membranes; membranes for electrochemical sensors; and mathematical modeling of membrane separation processes and ion and water transport in membrane systems. Studies aimed at improving the selectivity and performance of membranes and their stability are surveyed. New approaches to the synthesis and modification of membranes as well as their advanced applications are discussed.

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“…This is due to the presence of two types of sorption centers (acidic and basic) in the membrane, as well as due to the influence of hydration and the volume of membrane pores on the concentration and conformation of analyte ions. It is known that a change in the hydration of Nafion-type membranes, as well as the conformational transformations of polymer chains influencing on the distribution of sulfo groups inside the material and on the pore size, can be achieved by thermal treatment at the various relative humidities and the mechanical deformation of them [23,24,25,26,27,28]. Such changes are difficult at room temperature, i.e., are irreversible (“memory effect” of membranes).…”

Section: Introductionmentioning

confidence: 99%

Perfluorosulfonic Acid Membranes Thermally Treated and Modified by Dopants with Proton-Acceptor Properties for Asparaginate and Potassium Ions Determination in Pharmaceuticals

et al. 2019

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The influence of incorporation of the dopants with proton-acceptor properties into perfluorosulfonic acid cation exchange membranes (MF-4SC and Nafion), and their treatment conditions on the characteristics of Donnan potential (DP)-sensors (analytical signal is the Donnan potential) in the aqueous solutions containing asparaginate and potassium ions in a wide pH range was investigated. A silica, surface modified by 3-aminopropyl and 3-(2-imidazolin-1-yl)-propyl groups, was used as the dopant. The membranes were subjected to mechanical deformation and thermal treatment at various relative humidities. The relationship between water uptake and diffusion permeability of membranes subjected to modification and treatment and the cross sensitivity of DP-sensors based on them to counter and co-ions was studied. The multisensory systems for the simultaneous determination of asparaginate and potassium ions in a concentration range from 1.0 × 10−4 to 1.0 × 10−2 M and pH range from 4 to 8 were developed. An array of cross-sensitive DP-sensors based on MF-4SC membranes containing 3 wt.% SiO2 modified by 10 mol.% 3-aminopropyl and 3-(2-imidazolin-1-yl)-propyl was used for the potassium asparaginate hemihydrate and magnesium asparaginate pentahydrate determination in Panangin® (with an error of 2 and 4%, respectively).

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Sensitivity of potentiometric sensors based on Nafion®-type membranes and effect of the membranes mechanical, thermal, and hydrothermal treatments on the on their properties

Cited by 35 publications

References 29 publications

The proton conductivity and mechanical properties of Nafion®/ ZrP nanocomposite membrane

The proton conductivity and mechanical properties of Nafion®/ ZrP nanocomposite membrane

Prospects of Membrane Science Development

Perfluorosulfonic Acid Membranes Thermally Treated and Modified by Dopants with Proton-Acceptor Properties for Asparaginate and Potassium Ions Determination in Pharmaceuticals

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