Specific Conductance Values Research Articles

Optimization of Continuous Solid-State Distillation Process for Cost-Effective Bioethanol Production

To improve the efficiency of bioethanol production, an advanced process was required to extract ethanol from solid-state fermented feedstock. With regard to the characteristics of no fluidity of solid biomass, a continuous solid-state distillation (CSSD) column was designed with a proprietary rotary baffle structure and discharging system. To optimize the operation condition, fermented sweet sorghum bagasse was prepared as feedstock for a batch distillation experiment. The whole distillation time was divided into heating and extracting period which was influenced by loading height and steam flow rate simultaneously. A total of 16 experiments at four loading height and four steam flow rate levels were conducted, respectively. Referring to packing, rectifying column, mass, and heat transfer models of the solid-state distillation heating process were established on the basis of analyzing the size distribution of sweet sorghum bagasse. The specific heat capacity and thermal conductivity value of fermented sweet sorghum bagasse were tested and served to calculate the ethanol yielding point and concentration distribution in the packing. The extracting process is described as the ethanol desorption from porous media absorbent and the pseudo-first-order desorption dynamic model was verified by an experiment. Benefit (profit/time) was applied as objective function and solved by successive quadratic programming. The optimal solution of 398 mm loading height and 8.47 m3/h steam flow rate were obtained to guide a 4 m in diameter column design. One heating and two extracting trays with 400 mm effective height were stacked up in an industrial CSSD column. The steam mass flow rate of 0.5 t/h was determined in each tray and further optimized to half the amount on the third tray based on desorption equation.

Взаимосвязь удельной электропроводности расплавов галогенидов s1-элементов с удельной электропроводностью щелочных металлов

The paper presents an analytical description of the relationship of the specific electrical conductivity æ of individual alkali metals haloganides melts (MHal) (M – Li, Na, K, Rb, Cs, Fr; Hal – F, Cl, Br, I) and the specific electrical conductivity æ(M) of alkali metal melts for temperatures (Тпл + n) (Tпл – melting temperature K; n = 5, 10, 50, 75, 100, 150, 200° higher melting temperatures of MHal and metals) and the specific electrical conductivity of alkali metals at standard temperature using M.Kh. Karapetyans comparative methods. The relationship of properties æ(MHal при Тпл+n) = f(æ(MHal при Тпл+5)), æ(FrHalТпл+n) = f(æ(FrHalТпл+5°)) is described in the "property-property" coordinates. A comparative analysis of the specific electrical conductivity values of francium haloganides melts obtained by the proposed methods was carried out. The possibility of calculating the electrical conductivity of molten salts from the electrical conductivity of molten metals is shown. It is shown that the equation æ(MHal)0.5 = a + bæ(M)1.5 can be used to calculate the specific electrical conductivity of francium haloganides melts. The calculation of the specific electrical conductivity using various equations shows the consistency of the numerical values obtained.

The impact of extraction time on the quality of herbal teas

The research was done at Aleksandras Stulginskis University (Vytautas Magnus University Agriculture Academy since 2019) in 2015–2016. Tea blends were made from naturally occurring herbs and berries. The berries for blends were lyophilized and the medicinal plants were dried. The tea blends were filled with water at 90°C and extracted for 15 and 30 min, the infusions were filtered and then analysed. The purpose of the research was to determine the biochemical parameters and organoleptic properties of tea infusions extracted at different times using conventional and holistic research methods. The amount of soluble solids, vitamin C, titratable acidity, pH, redox potential, specific electrical conductivity and energy value (P) of the products were determined in the tea infusions. The values of the tea infusions colour coordinates (L*, a*, b*) were determined and sensory analysis was performed. The research results showed that the amounts of soluble solids and vitamin C were greater in the tea infusions extracted for 15 min than those in the infusions extracted for 30 min. After extraction for 30 min, the titratable acidity of the tea infusions also decreased. The pH values were higher for the tea infusions extracted for 15 min, whereas the values of redox potential and electrical conductivity were higher for the tea infusions extracted for 30 min. All tea infusions extracted for 15 min were characterized by a lower energy value (P) and are therefore more suitable for human organism. During extraction over a longer period (30 min), the colour of the tea infusions became richer. The colour, smell and taste of the tea infusions extracted for 30 min were scored higher by sensory evaluation.

Highly conductive polyporphyrin films obtained by superoxide-assisted electropolymerization of para – aminophenyl porphyrin

The process of deposition of 5,10,15,20-tetrakis(4-aminophenyl)porphyrin (H2T(4-NH2Ph)P) electopolymer films induced by superoxide anion radical in dimethyl sulfoxide (DMSO) has been studied. By the methods of electrode impedance spectroscopy and atomic-force microscopy it has, for the first time, been proved that it is possible to form a poly-H2T(4-NH2Ph)P film in DMSO in potentiostatic conditions at oxygen electroreduction potentials. Charge transfer through the poly-H2T(4-NH2Ph)P film has been characterized by modeling electrochemical impedance spectroscopy (EIS) data. It has been shown that in potentiostatic conditions, the formation of a poly-H2T(4-NH2Ph)P film induced by superoxide anion radical consists of at least two stages. At the first stage, the resistance of the surface film changes insignificantly, and at the second one it increases approximately linearly over time. Using the vibrational spectroscopy we have determined the type of binding of monomer fragments in the polyporphyrin film. The morphology and thickness of the deposited polyporphyrin films have been studied by the methods of atomic force microscopy. Based on the resistance and thickness estimates, we have determined the value of specific conductivity of the obtained film (about 4.2•10−4 S cm−1). The metal-free aminophenyl porphyrin electopolymer was also successfully tested as an electrocatalyst for the oxygen reduction reaction.

Effect of random macroscopic defects on kinetic phenomena in a layered semiconductor n-InSe with strong electric fields

In single-crystal n-InSe layered semiconductors at 77÷300 K, the dependence of the electrical conductivity on the strength of a strong electric field by an ultrahigh frequency (UHF) was studied. It was established that at low temperatures, the magnitude and course of the change in conductivity under the action of a strong electric field in samples with different initial (existing at 77 K) specific conductivities differ. The dependence of the electrical conductivity on the electric field strength in the most low-resistance samples is satisfactorily described by the theory of heating of charge carriers by the electric field in spatially homogeneous crystalline semiconductors, and with a decrease in the value of specific conductivity, it disagrees with this theory. It is shown that these discrepancies are due to the presence of random macroscopic defects in the crystals under study, which are formed due to the weakness of the interlayer coupling.

A Change in the Specific Conductance of Solutions of High-Vanadium Heteropoly Acids in Redox Processes

Changes in the values of specific conductance χ of the solutions of high-vanadium Mо−V−Р heteropoly acids (HPA-х) in redox processes are determined for the first time for the HPA-7 solution of the overall composition Н10Р3Мо18V7O84, which is a highly efficient catalyst for oxidation processes. The dependences of χ on [HPA-7] at different temperatures and degrees of reduction m and the dependence of χ on m, are found. The relationship between χ and the equilibrium composition of the HPA-7 solution is shown. It was confirmed that the regenerated HPA-7 solutions completely restore their conductance and other physicochemical properties (redox potential E, density, viscosity, and pH), thereby proving the high stability as homogeneous catalysts of oxidative processes.

Effect of the Functionalization of Nitrogen-Doped Carbon Nanotubes on Electrical Conductivity

Values of specific electric conductivity are determined for nitrogen-doped carbon nanotubes (N‑CNTs) and N-CNTs oxidized with 68 wt % HNO3. It is established that the electrical conductivity of the material falls considerably along with nitrogen content in the tubular structure of the N-CNTs and an increase in the number of oxygen-containing groups on their surfaces due to a rise in the concentration of defects in their structure. The electrical conductivity of all types of samples rises along with pressure.

Sorption and dielectric properties of jute woven fabrics: Effect of chemical composition

The jute woven fabric was treated with sodium hydroxide and sodium chlorite under different conditions in order to study the influence of the chemical composition on their sorption and dielectric properties. After the alkali treatments, the hemicelluloses content decreased in the range of 14.4–46.7%, which leads to elementary fiber liberalization and increased moisture sorption of the jute fabrics up to 15.5% and 11.9% at 30% and 80% relative humidity, respectively. The X-ray diffraction analysis shows that the removal of hemicelluloses for 14.4% and 36.6% was followed by a decrease in the crystallinity index for 3.0% and 18.8%, respectively. The additional decrease in hemicelluloses content of 46.7% was accompanied by a slight increase in the crystallinity index for about 14%. These results are in a good agreement with the results obtained for the AC specific electrical conductivity (at 30% and 80% relative humidity). After the oxidative treatments, the lignin content decreased in the range of 37.8%–79.0%, which causes two parallel effects: a slightly increased moisture sorption (up to 7.4% and 4.6% at 30% and 80% relative humidity, respectively) and crystallinity index (from 4.8%–16.6%). The jute fabrics with 37.8% and 63.2% lower lignin content and similar moisture sorption values have the same AC specific electrical conductivities at both relative humidities (30% and 80%) revealing a dominant effect of moisture sorption. The AC specific electrical conductivity of the investigated jute fabrics increases with increasing the frequency as well as relative air humidity, where the highest difference between the values of AC specific electrical conductivity is obtained at the highest frequency (140 kHz).

Novel Methodological Approaches to the Study of Sorbents in Soils Polluted with Heavy Metals

A rapid method for indirect assessment of heavy metal mobility based on measurements of specific electric conductivity of soil in model experiments with predefined parameters and a homogeneous medium has been proposed. A strong correlation between the specific electric conductivity values obtained by direct measurements of the soil’s electric resistance and the values obtained with an instrumental method of quantitative element analysis was established. The sorbent showed the highest efficiency towards cadmium; the degree of cadmium sorption being as high as 61.6% at a component ratio of 1 : 3 (sapropel to lime). An efficient sorbent for lead contained the same components at a 1 : 1 ratio and absorbed 14.3% of the ions, and the best ratio for zinc sorption was 1 : 5 (6.4% of ions sorbed).

Аналитическое описание удельной электропроводности расплавов галогенидов KHal и расчет ее для расплава KAt

In this paper, the analytical description of the specific conductivity of the potassium halogenides melts KHal (Hal – F, Cl, Br, I) is presented. The analitical description is provided on dependence of the specific conductivity on the halogen order number ӕ = f(Z), the ionic radius of halogen-ion ӕ = f(r), the ionic potential ӕ = f(1/r), the electronegativity difference ӕ = f(∆χ) ((∆χ = χ (Hal) – χ(K)). The interrelation of a reduced property with an order number ӕ/Z = f(Z) is considered. According to the obtained analytical dependencies, the calculation of the value of the potassium astatide specific conductivity is given for temperatures above the melting point on 5, 10, 50, 75, 100, 150 и 200°, in literature Information for KAt absent. The calculation was carried out using comparative methods for calculating M.Kh. Karapetyan in the coordinates of "property-parameter" and "property-property." Least squares method was applied for processing the analytical description results with the choice of optimal dependencies on the maximum correlation coefficient and the minimum standard deviation. The analysis of the interrelation of the calculated numerical values with similar characteristics for NaAt и LiAt is presented. Comparison of the specific conductivity obtained numerical values of the astatide potassium melt showed good consistency with the values ӕ obtained from the straight line dependence ӕТпл+n = a∙ ӕТпл+5 (n = 10°…200°) and also with similar characteristics for lithium astatide and sodium astatide. The analytical calculation results allow to describe the temperature dependence of the potassium halogenides specific conductivity, including KAt. The calculation method can be used to describe the melts specific conductivity in the same type series of compounds of alkaline and alkaline-earth elements that make up electrolytes for chemical current sources.

Four Probe Impedance and Transference Number Analysis on Polymer Electrolytes in Liquid Phase

To meet the ever increasing demand for high energy density storage devices, not only the high energy density materials are eagerly required, but also is there an increasing attention in achieving a high safety standard for lithium-ion batteries (LIBs). Recently, there have been paper that claimed PVDF coating on the anode is proved to effectively suppress the growth of Li dendrite, leading to high Coulombic efficiency even under large current densities, enhanced full-cell capacity density and improved safety for LIBs. This special coating is named artificial solid-electrolyte interphase (ASEI), which supposed to have the characteristic of flexible and high ionic conductivity. In order to measure the specific ionic conductivity value of the polymer coating layer, we design a novel four-probe electrochemical impedance spectroscopy (EIS) measuring system, which is allowed to measure the impedance of various polymer membrane in a liquid electrolyte filled atmosphere. With the nature of four probe measurement, the impedance contributed by the electrodes can be ignored in this case, meaning the equivalent circuit is just a resistor, corresponding to the ionic resistance of the electrolyte between the two references. Moreover, the activation energies of each polymer film is also calculated under various temperatures statement applied. A large transference number can reduce concentration polarization of electrolytes during charge–discharge steps, and thus produce higher power density. It is highly desirable that the transference number of lithium ions approaches 1 in an electrolyte system. In this work, we also set up a complete system to fully analyze the property of various polymers and to further reach to a best polymer for LIBs as an ASEI. Figure 1

Mechanochemical synthesis and composite properties polyanіline/cellulosе

The mechanochemical (solid phase) method synthesized polyaniline/cellulose composites and investigated some of their physicochemical properties, namely, phase state, structure, interphase interaction and electrical conductivity. The ratio of reagents (g: g) to aniline sulphate: ammonium peroxodisulfate was 1.310 : 1.766, and the ratio of aniline sulfate: cellulose (g: g) was 1.310 : 1.000, or 1.310 : 0.500, or 1.310 : 0.250. According to the results of X-ray and FT-IR spectral analyzes, it was found that the synthesized samples correspond to the characteristics of composite materials. It is established that the structure of composites is amorphous. The presence of cellulose in composites has been confirmed by X-ray and FT-IR spectral analyzes. The analysis of the results of the infrared spectral analysis confirms the high electrical conductivity of samples of composites. It is shown that between components of composites there is a phase interaction through the formation of hydrogen bonds due to the interaction between -NH or -N = groups and surface functional groups of cellulose fibers. All synthesized samples have electrical conductivity. The highest value of the specific conductivity has a pure PAn, and with increasing content of the Goal in composites, a slight decrease in electrical conductivity is observed due to the non-conductivity of cellulose. The conductivity of the composites has increased significantly in relation to pure cellulose and is 0.91× 10 -2 , 1.86×10 -2 and 2.15×10 -2 S cm -1 , and the electrical conductivity of the polyaniline is 2.77×10 -2 cm -1 . Relatively high values of specific conductivity of samples of composites can be attributed to the additional crushing of cellulose microfiber with mechanochemical synthesis to nanosized values. From the results it is seen that the synthesized specimens are composites with certain structural and electrical conductive properties. Keywords: polyaniline, cellulose, solid phase synthesis, composites, structures, properties.

Structure and conductive properties of C60 films and fullerene-containing materials deposited using aromatic and non-aromatic solvents

Films of fullerenes and fullerene-containing materials have been synthesized from their solutions of various volumes in aromatic and non-aromatic solvents. The photographs and the sizes of the resulting microstructures have been presented. The comparison of IR spectra has been given. Specific conductivity values have been considered.

Experimental analysis of water-based nanofluids using boron nitride nanotubes with improved thermal properties

Nowadays, the use of nanofluids as alternative to commonly-used industrial heat transfer fluids is a topic of increasing interest. Analysing the improved efficiency of heat transfer processes according to advanced nanomaterials and obtaining stable nanofluids is one of the most interesting challenges. This paper presents a study of nanofluids based on boron nitride nanotubes and using an aqueous solution of Triton X-100 (which acts as a surfactant) as the base fluid. UV-vis spectroscopy, particle size measurements (size between 150 and 170 nm) and ζ potential (at about −25 mV) showed that stable nanofluids were obtained. Surface tension measurements were also performed. The surface tension of water was weakly affected by the presence of any amount of nanoparticles and was mainly governed by the presence of surfactant. The rheological properties of the fluids were also analysed, as were their isobaric specific heat and thermal conductivity values. A Newtonian behaviour was observed for the base fluid and the nanofluids, with no significant increase in viscosity. The isobaric specific heat increased by 8% and thermal conductivity by 10% compared with the base fluid. Thus, the results obtained are interesting because while thermal properties improved with nanoparticle content, rheological behaviour did not change. Consequently, the nanofluids studied in the current paper do not raise the pressure drop and pumping power significantly and may therefore be a good option for thermal system applications.

Effect of grain boundary and Ar–H2 atmosphere on electrical conductivity of bulk a-La2Mo2O9 studied by impedance and x-ray photoelectron spectroscopy

The effect of grain boundary on electrical conductivity of α-La2Mo2O9 (LAMOX) over the temperature range of 300 °C to 400 °C has been investigated in this paper. Grain boundary effect characterisation for the mentioned temperature range has been done by electrochemical impedance spectroscopy (EIS). The calculated values of grain boundary width and specific grain boundary conductivity for α- La2Mo2O9 are 14.6 nm and 0.0146 μS/cm respectively. Total ionic conductivity calculated by EIS for α-La2Mo2O9 at 300 °C is 1 μS/cm. Resulting electrical conductivity of grain boundary comes out to be two orders less than the total electrical conductivity suggesting high activation energy requirement for grain boundary conduction. The electrical conductivity of α-La2Mo2O9 treated in Ar-H2 atmosphere (2.5 mS cm−1 at 200 °C) is approximately three orders higher than the electrical conductivity of LAMOX treated in air atmosphere. This may be attributed to reduction of Mo6+ to lower valance states in LAMOX as confirmed by x-ray photoelectron spectroscopy (XPS). Therefore, the low ionic conductivity nature of monoclinic phase of La2Mo2O9 has been explained on the basis of grain boundary conduction mechanism in the present study.

A Solvothermal Synthesis of TiO₂ Nanoparticles in a Non-Polar Medium to Prepare Highly Stable Nanofluids with Improved Thermal Properties.

Nanofluids are systems with several interesting heat transfer applications, but it can be a challenge to obtain highly stable suspensions. One way to overcome this challenge is to create the appropriate conditions to disperse the nanomaterial in the fluid. However, when the heat transfer fluid used is a non-polar organic oil, there are complications due to the low polarity of this solvent. Therefore, this study introduces a method to synthesize TiO2 nanoparticles inside a non-polar fluid typically used in heat transfer applications. Nanoparticles produced were characterized for their structural and chemical properties using techniques such as X-ray Diffraction (XRD), Raman spectroscopy, Transmission Electron Microscopy (TEM), Fourier Transform Infrared (FTIR) spectroscopy, and X-ray photoelectron spectroscopy (XPS). The nanofluid showed a high stability, which was analyzed by means of UV-vis spectroscopy and by measuring its particle size and ζ potential. So, this nanofluid will have many possible applications. In this work, the use as heat transfer fluid was tested. In this sense, nanofluid also presented enhanced isobaric specific heat and thermal conductivity values with regard to the base fluid, which led to the heat transfer coefficient increasing by 14.4%. Thus, the nanofluid prepared could be a promising alternative to typical HTFs thanks to its improved thermal properties and high stability resulting from the synthesis procedure.

Электропроводность многослойных монополярных ионообменных мембран

Проведенные нами измерения электрического сопротивления пакетов монополярных ионообменных мембран дали возможность сделать вывод о малых величинах межмембранных электрических сопротивлениях. Это позволяет принципиально увеличить корректность контактно-разностного метода измерения электропроводности мембран. Работа содержит результаты измерения зависимостей величин удельной электропроводности от частоты переменного тока. Экстраполяция низкочастотных зависимостей удельных электропроводностей на нулевую частоту даёт возможность получить величины близкие к удельным электропроводностям на постоянном токе с целью использования их при математическом моделировании электродиализа с ионообменными мембранами

Karst hydrogeological observations in Tra Linh and Quang Uyen districts, Cao Bang province, Vietnam

The Tra Linh and Quang Uyen Districts are located in Cao Bang Province, Northeastern Vietnam, where abundant rainfall combined with considerable soluble limestones of Devonian, Carboniferous, and Permian ages support a spectacular tower karst landscape. This paper is a comprehensive study based on geologic, tectonic, and hydrogeological observations in the Tra Linh and Quang Uyen Districts, Cao Bang Province, Vietnam, enhanced with water-quality samples collected from 31 sites. Each location was sampled once, in March 2012 or February 2014, except Hang Ban Lang (HQ-31) and Hang Ban Nua (HQ-32) springs, which were sampled twice to determine variability in water quality. The water samples were analyzed for physical proprieties and chemical and isotopic composition. To better understand the impact of the lithologic factor to the development of the karst landscape in the study area, two rock samples were collected and analyzed during the 2014 trip. Four additional rock samples were collected for comparison from areas located in similar humid subtropical climate as the study area; three from Thailand and one from Alabama, USA. The data and analyses presented herein are performed for the first time in the study area. Results showed that groundwater quality met US drinking-water standards, with only manganese exceeded secondary maximum contaminant levels (MCLs) in seven samples. Specific conductance values for the water samples ranged from 153.2 to 421.6 µS/cm. The pH values ranged from 6.51 to 8.29, total hardness (as CaCO3) was between 85 and 326 mg/L, the total alkalinity as CaCO3 varied from 68 to 207 mg/L, and carbon dioxide varied between 32.4 and 123.4 mg/L. The water chemistry is dominated by calcium. The highest concentrations of calcite were recorded in the rock samples collected in Vietnam. The water samples collected in the Cao Bang Province are depleted in both 18O and deuterium with a d-excess value above ~ 10‰ and have a median value of 13.16‰. Some samples exhibited lesser (three samples with values under 10; a sinking stream, a karst window, and a lake) or higher deuterium excess values due to local variations in humidity, temperature, and wind speed. The data set reported here only represents a local and time-limited snapshot of the water isotopic compositions. Further studies are required to confirm our preliminary results from Cao Bang Province.

Responses of stem hydraulic traits in Salix psammophila and Caragana korshinskii to manipulated precipitation variation.

With a precipitation manipulation experiment (Control, +45% and -50%), the responses of stem hydraulic traits in two dominant shrubs (Salix psammophila and Caragana korshinskii) of water-wind erosion crisscross region of the Loess Plateau to projected precipitation variation were examined to elucidate their adaptability to future precipitation changes. Results showed that the specific hydraulic conductivity (Ks), leaf specific conductivity (Kl) and Huber value in S. psammophila increased significantly by irrigation but showed no responses to drought. The predawn and midday leaf water potential and water transport efficiency (Ks and Kl) in C. korshinskii decreased significantly by drought, and showed no responses to irrigation. The embolism resistance across different treatments did not differ in the two shrubs. The midday native embolisms across treatments in S. psammophila were almost the same. Drought increased midday native embolism in C. korshinskii. Irrigation increased conduit diameter and conduit area per stem sap area while drought increased the vessel density and decreased the hydraulic diameter in S. psammophila. Irrigation had no effect on xylem anatomy, whereas drought increased the vessel density and wood density in C. korshinskii. These results indicated that irrigation promoted stem hydraulic function in S. psammophila, and drought decreased stem hydraulic function in C. korshinskii. C. korshinskii may be less resistant to future dry climate than S. psammophila.

INFLUENCE OF FREQUENCY OF ELECTRIC CURRENT ON ELECTRIC CONDUCTIVITY OF THIN FILMS OF ELECTROLYTES

In the work the investigations of the effect of abnormally high electric conductivity of surface of the air-electrolyte interface during electrolytic decomposition of water were continued. Experiments were carried out both at alternating current via the bridge circuit and at direct current in the four-electrode cell. Previously, it was shown that in thin air-bordering electrolyte layers specific conductivity measured in the four-electrode cell during electrolysis of water exceeds the corresponding value measured with the bridge circuit for solutions of sodium hydroxide by 1.5 times, for solutions of sulfuric acid by 1.25 times and for solutions of sodium sulfate by 2.5 times. When replacing the gas-liquid interface by the liquid-solid phase one the effect disappears. It was shown that the abnormally high electric conductivity of thin air-bordering electrolyte layers depends on temperature (at 4 °С electric conductivity of 1 mm thick solution layer increases 8-12 times), ion composition, pH (maximum 5 times increase of electric conductivity corresponds to pH of isoelectric point). This allowed suggesting that such effect is caused by tunneling of charge (without mass transfer) through ordered structures on the surface of water - giant heterophase clusters. This mechanism has been called croquet. To check the influence of surface the experiments in 1 mm and 0.1 mm thick layers of electrolyte were conducted. Thin electrolyte films were stabilized by the DC-10 surfactant and the thickness was measured by interferometric methods. It has been shown that specific electric conductivity of thin films increases by 150-250 times in comparison with conductivity of the original electrolyte. This confirmed our assumptions on the nature of the effect of abnormally high electric conductivity of the gas-electrolyte interface during electrochemical generation of uncompensated H+ and/or OH- ions. Surprisingly, it appears that specific electric conductivity of the electrolyte film of thickness below 50 μm as measured at the 10 kHz alternating current is also higher than conductivity measured with the same method in the initial electrolyte volume. The values of electric conductivity of thin electrolyte films measured by different methods were almost identical. It has been suggested that this phenomenon is related to the changed conditions of charging of the double electric layer. To test the hypothesis, the values of specific electric conductivity of 1 mm thick electrolyte layer were measured at changing from 10 kHz to 0.1 Hz frequencies of alternating current. It was shown that the effect of increase in the electric conductivity begins to occur at frequencies up to 1 kHz. Calculations showed that at these frequencies the quantity of electricity transferred to the electrodes is sufficient for charging the double layer and initiation of the Faraday process. Thus, another confirmation that the croquet mechanism of electric conductivity occurs at the two conditions – the electrolytic generation of H+ or OH- ions and the transfer of charges through ordered structures on the surface of water – was found.Forcitation:Nefedov V.G., Matveev V.V., Korolyanchuk D.G. Influence of frequency of electric current on electric conductivity of thin films of electrolytes. Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol. 2018. V. 61. N 2. P. 58-64