Water Salt Solutions Research Articles

Molecular dynamics insights into the dynamical behavior of structurally modified water in aqueous deep eutectic solvents (ADES).

Recent studies have demonstrated that the presence of water in deep eutectic solvents (DESs) significantly affects their dynamics, structure, and physical properties. Although the structural changes due to the addition of water are well understood, the microscopic dynamics of these changes have been rarely studied. Here, we performed molecular dynamics simulation of 30% (v/v) (∼0.57 molar fraction) water mixture of DES containing CH3CONH2 and NaSCN/KSCN at various salt fractions to understand the microscopic structure and dynamics of water. The simulated results reveal a heterogeneous environment for water molecules in aqueous DES (ADES), which is influenced by the nature of the cation. The diffusion coefficients of water in ADESs are significantly lower than that in neat water and concentrated aqueous NaSCN/KSCN solution. When Na+ ions are replaced by K+ ions in the ADES system, the diffusion coefficient increases, which is consistent with the measured nuclear magnetic resonance data. Self-dynamic structure factor for water and other simulated dynamic quantities, such as reorientation, hydrogen-bond, and residence time correlation functions, show markedly slower dynamics inside ADES than in the neat water and aqueous salt solution. Moreover, these dynamics become faster when Na+ ions in ADES are replaced by K+ ions. The results suggest that the structural environment of water in Na+-rich ADES is rigid due to the presence of cation-bound water and geometrically constrained water. The medium becomes less rigid as the KSCN fraction increases due to the relatively weaker interaction of K+ ions with water than Na+ ions, which accelerates the dynamical processes.

Effect of shear rate, temperature, and salts on the viscosity and viscoelasticity of semi‐dilute and entangled xanthan gum

AbstractXanthan gum, a naturally‐occurring, high‐molecular‐weight, anionic polyelectrolyte, exhibits significant drag‐reducing properties at low concentrations in water, suggesting promising applications in geothermal networks. The flow behavior of xanthan solutions are explored, specifically at concentrations in the semi‐dilute (1000 ppm by mass) and entangled (4000 ppm) regimes as well as in both water and various salt solutions across a temperature range of 5–85°C. The viscosity and viscoelastic properties of xanthan solutions examine relationships between polyelectrolyte concentration, temperature, and salt concentration. Viscosity decreases by two orders of magnitude in 4000 ppm xanthan solutions in deionized water and with 50 mM NaCl (in the high salt limit) as the temperature increases from 5 to 85°C. Next, the addition of salts affects viscosity differently in the two concentration regimes. Specifically, at 25°C, the zero‐shear rate viscosity upon salt addition decreases by 63% for 1000 ppm solutions (from 0.54 to 0.2 Pa s) but increases by 280% for 4000 ppm solutions (from 28 to 107 Pa s). At 1000 ppm, salt ions cause chain collapse, reducing viscosity; At 4000 ppm, entanglements led to structural changes, resulting in higher viscosity. Furthermore, three salts commonly found in geothermal waters, namely NaCl, Na2CO3, and NaHCO3, exhibited similar changes in viscosity and shear thinning behavior in the entangled regime across temperatures from 5 to 85°C.

Bacterial cellulose-based Janus energy storage phase change composite aerogel for efficient interfacial solar vapor generation

Interfacial solar evaporation systems based on Janus structures exhibit potential application prospects in terms of salt tolerance. However, intermittent and unstable light conditions limited the evaporation rate and water production performance of the evaporators. The introduction of energy storage phase change (ESPC) composite materials into the interface solar evaporators can effectively solve this problem. In this work, bacterial cellulose (BC) is selected as the matrix material, sodium alginate (SA) and multi-walled carbon nanotubes (MWCNTs) are added as functional fillers, and porous composite aerogels are prepared using direct freeze-drying. On this basis, Janus porous composite aerogel (J-BCS/CNT) with ESPC function is further constructed by depositing paraffin onto the upper layer of the aerogel through a unilateral vacuum impregnation method. The aerogel exhibits strong photothermal conversion capabilities and excellent thermal management properties. The addition of appropriate amount of MWCNTs enables it to obtain high latent heat storage and release functions, providing energy for operation in dark conditions. Under the solar irradiation of 1.5 kW m−2, J-BCS/CNT40% aerogel exhibits a high evaporation rate of 1.95 kg m−2h−1 in pure water and 0.67 kg m−2h−1 under dark conditions. The salt evaporation resistance test shows that the aerogel has excellent purification capabilities in high-concentration salt water (20 wt%) solutions. More importantly, the long-term energy storage-release tests of J-BCS/CNT in 3.5 wt% saline water indicate that the aerogel reveals excellent sustainability and latent heat release functions.

Analysis of wettability and contact angle of sodium bicarbonate impregnated wooden surfaces

Scots pine and spruce wood samples were vacuum impregnated with 3, 5, and 9% sodium bicarbonate solution. Contact angle measurements were made by dropping 0.05 mL of pure water and 3% saltwater solution onto the material’s surface. The surface roughness of each sample was measured, and that of Scots pine control samples was higher than that of spruce samples, but the surface roughness values of spruce wood were higher in the samples impregnated with sodium bicarbonate. When pure water or saltwater solution was dropped onto the samples, it was observed that as the waiting times increased, the contact angle value decreased, the droplet height decreased, and the droplet width increased. It was found that the contact angles were higher in the control samples of both tree species than in the samples of 5% and 7%. The contact angles of 9% impregnation solution, pure water, and salt water were higher than the control samples. As the solution ratio increased on the surfaces impregnated with sodium bicarbonate, the contact angle also increased, and the wettability behavior decreased accordingly. Sodium bicarbonate solution is effectively used in the impregnation process for pine and fir woods, making the materials more resistant to water under outdoor conditions. This solution significantly reduces the risk of deformation of wood by increasing the contact angle and reducing its water absorption properties.

Hydrodynamic Properties and LCST Behavior of Six-Armed Star-Shaped Polymers with Arms of a Diblock Copolymer of Poly-2-Ethyl-2-Oxazine and Poly-2-Isopropyl-2-Oxazine

Star-shaped six-arm polymers with arms of the block copolymers of poly-2-ethyl-2-oxazine and poly-2-isopropyl-2-oxazine were synthesized. The branching center was hexaase[26]cyclophane. The prepared samples differed in the order of block attachment to the core. Molar masses of the two samples were 14200 and 21500 g⋅mol−1. The fractions of poly-2-ethyl-2-oxazine monomers in the arms were 61 and 65%, respectively. It was shown that the arms were strongly folded. Water-salt solutions of the star-shaped block copolymers exhibited thermoresponsiveness. The difference in the phase separation temperatures for the studied samples was caused by the differences in their molar masses and the different contents of poly-2-ethyl- and poly-2-isopropyl-2-oxazine blocks. The concentration dependences of the phase separation temperatures for the synthesized star-shaped copolymers coincided with those for the arms, despite the fact that the molecular masses of the stars and their arms differed by factor of near 6. The addition of NaCl to the aqueous of solutions of the star copolymers did not lead to significant changes in their characteristics. No influence of the order of the block attachment to the core on the molecule conformation and on the thermoresponsive behavior was found.

Effects of surface roughness parameters on the shear strength of AA 6061-T6 aluminium alloy in structural adhesive bonding applications

This study aims to investigate the effects of the surface roughness of an aluminium substrate on the adhesive joint strength of aluminium–aluminium specimens prepared using epoxy and methyl methacrylate adhesives for shear strength tests. Aluminium surfaces were mechanically abraded using silicon carbide (SiC) papers with different grit sizes in two different modes. The evaluated bonding performance characteristics included the maximum bonding strength and residual strength of the adhesive joints after their exposure to various environmental conditions. The results demonstrated that excellent adhesion characteristics were obtained at the optimum SiC grit size (grit-80) regardless of the adhesive type. In addition, the topographical and morphological properties of the aluminium surfaces were studied before and after mechanical abrasion via surface profilometry and scanning electron microscopy, respectively. A possible mechanism was proposed to explain the observed shear strength changes and respective modes of fracture after sample exposure to air, de-ionised water, and aqueous salt solutions.

Preparation of polyurethane shell microcapsules containing isocyanate core by Pickering emulsion method using modified silica nanoparticles and investigation of their self-healing performance

Encapsulating repair agents are increasingly popular for repairing coating damage, with capsules being a common method to address surface scratches by releasing healing liquid into the fissure. However, creating microcapsules that are durable against environmental factors remains a key concern. Current research focuses on advancements in encapsulating healing agents and their production methods, particularly emphasizing the integration of capsules into coatings for external self-healing purposes. Polyurethane capsules containing isophorone diisocyanate were synthesized using the Pickering emulsion method with modified silica as a Pickering emulsion stabilizer in three different percentages and then dispersed in urea formaldehyde at varying weight percentages. The self-healing properties of this coating were then studied. Fourier transform infrared spectroscopy (FTIR), Soxhlet extraction, and thermogravimetric analysis (TGA) were performed on the samples to ensure the success of the encapsulation process. The morphology of the capsules was investigated using field emission scanning electron microscopy (FE-SEM), revealing that the synthesized capsules possess a spherical shape and are adequately spaced apart. These capsules were spherical at micron scales, with differences observed based on the quantity of stabilizing nanoparticles employed. Furthermore, the capsules demonstrated robust thermal stability, as evidenced by the increase in IPDI evaporation temperature from approximately 140 °C to 240 °C.Immersion test results in saltwater solutions showed that coatings containing pickering capsules exhibited better corrosion resistance, further validating the success of the research. The shell strength of the capsules prepared using the Pickering method was increased, enhancing the stability of the microcapsules during the mixing process with the resin and demonstrating self-healing properties. These findings have significant practical implications, as they demonstrate the potential to improve the durability and lifespan of coatings in various applications.

The effect of various crystalline forms of HFC 134a hydrate on the growth rate and desalination efficiency

Experimental studies on the synthesis of HFC 134a hydrate in the liquid HFC 134a – water system were performed. Despite today's lack of research on the use of HFC 134a hydrate for desalination of seawater and separation of harmful impurities by HFC 134a hydrate synthesis, this method has prospects for development: HFC 134a hydrate is synthesized at relatively high temperature and low pressure; it is poorly soluble in water, which simplifies gas hydrate separation from water–salt solution; it has high volumetric storage density and relatively high thermal conductivity. In spite of its low solubility in water, HFC hydrate exhibits relatively high growth rates. The growth of various crystalline forms and the peculiarities of their occurrence in pure water, aqueous salt solution, as well as with the addition of surfactant are considered. The use of SDS increases the HFC hydrate growth rate. For the first time, it was shown that the intensive growth of HFC 134a hydrate in the form of needles throughout the entire volume of the liquid allows increasing the efficiency of desalination. It is important to consider the desalination process comprehensively, taking into account the crystal forms, crystal growth rate, crystal defects, as well as taking into account the degree of salt removal. Simultaneously with the bubble growth, a thin gas hydrate film is shown to grow on the bubble surface. A detailed consideration of the stages of such hydrate growth is provided to explain the high-speed synthesis of porous HFC hydrate due to boiling of liquid HFC and vaporization.

Study on Bonding Characteristics of Aluminum Alloy Treated by Plasma Electrolytic Oxidation Process and Polymer Resin Bonded by Direct Injection Molding

Aluminum alloy and polymer resin hybrid bonding technology is essential for lightweight mobile phone frames and automotive components. Recently, there has been extensive research on a method of bonding metals and polymer resins by treating the metal surface and then direct injection molding. However, this method requires separate surface treatment of the aluminum alloy after bonding to enhance its corrosion resistance. This paper studies the use of Plasma Electrolytic Oxidation, one of the surface treatment methods for aluminum, to achieve the bonding of aluminum and polymer resin in a single surface treatment step while ensuring high corrosion resistance. We conducted research to investigate optimal conditions by adjusting the process variables of Plasma Electrolytic Oxidation, in order to achieve integration with the polymer resin and measure the bonding strength and corrosion resistance. The surface characteristics of each Plasma Electrolytic Oxidation condition were analyzed using scanning electron microscopy and atomic force microscope equipment, while the bonding strength was measured using universal testing machine equipment. The corrosion characteristics were evaluated by measuring the corrosion resistance in a saltwater solution.

Assessment of Environmental Impact on Glass-Fiber-Reinforced Polymer Pipes Mechanical and Thermal Properties.

Glass-fiber-reinforced polymer (GFRP) composites are widely used due to their high strength-to-weight ratio and corrosion resistance. However, their properties can degrade under different environmental conditions, affecting long-term reliability. This study examines the effects of temperature and chemical environments on GFRP pipes. Specimens were exposed to salt water and alkaline solutions at 20 °C and 50 °C. Diffusion coefficients and tensile and flexural properties were measured. Advanced techniques (TGA, FT-IR, and XRD) showed a 54.73% crystallinity difference between samples at 20 °C/air and 50 °C/salt water. Elevated temperatures and alkaline conditions accelerated degradation, with diffusion coefficients 68.38% higher at 50 °C/salt water compared to at 20 °C/salt water. Flexural strength decreased by 47.65% and tensile strength by 13.89%, at 50 °C/alkaline compared to 20 °C/air. Temperature was identified as the primary factor affecting mechanical performance, while alkaline environments significantly influenced tensile and flexural modulus. These results underscore the importance of considering environmental factors for the durability of GFRP composites.

A Metal Accelerator Approach for Discharging Cylindrical Lithium-Ion Batteries in a Salt Solution

Recycling lithium-ion batteries provides sustainable raw materials. Crushing and separation are necessary for extracting metals, like lithium, from batteries. Crushing a battery carries a risk of fire or explosion. Fully discharging the battery is crucial for safe production. Discharging batteries in a salt solution is a simple and cost-effective large-scale process. However, it is important to note that there is a potential risk of corrosion and loss of battery elements when batteries are immersed in a salt solution. The purpose of this study is to investigate the effectiveness of two distinct methodologies at enhancing the voltage drop of a cylindrical battery when immersed in a salt solution while preventing corrosion. These techniques involve the application of iron and copper accelerators. A 20 wt.% salt water solution was chosen based on the research of several researchers. As the current flows through the metal parts, it encounters electrical resistance and forms an electric circuit with the electrolyte solution. This interaction converts electrical energy into various physical–electrical–electrochemical phenomena, leading to a decrease in battery voltage. Research revealed that the battery can be discharged up to 100% within 4 h without causing corrosion to its components. Another point to note is that if copper conductors are used, it is possible to decrease the battery voltage by around 90% within 8 h. The gap between the copper conductor and the battery had a direct impact on the battery’s discharge rate. Reducing the distance significantly increased the discharge rate, as confirmed by experimental evidence. This discharge mechanism was thoroughly described in a schematic, and, to further explain the electrochemical reaction, the Pourbaix diagram was utilized for both the Fe-Na-Cl and Cu-Na-Cl systems. Moreover, our theoretical predictions were validated through a chemical and mineralogical analysis of the precipitates that formed in the solution.

MXene-Enhanced Ionovoltaic Effect by Evaporation and Water Infiltration in Semiconductor Nanochannels.

In recent years, substantial attention has been directed toward energy-harvesting systems that exploit sunlight energy and water resources. Intensive research efforts are underway to develop energy generation methodologies through interactions with water using various materials. In the present investigation, we synthesized sodium vanadium oxide (SVO) nanorods with n-type semiconductor characteristics. These nanorods facilitate the initiation of capillary phenomena within nanochannels, thereby enhancing the interfacial area between nanomaterials and ions. The open-circuit voltage (VOC) was 0.8 V, and the short-circuit current (ISC) was 30 μA, which were continuously monitored at room temperature using a 0.1 M saltwater solution. Additionally, we achieved enhanced energy generation by efficiently converting light energy into thermal energy using MXene, a 2D material. This was accomplished through the photothermal effect, leveraging the inherent semiconductor characteristics. Under light exposure, the system exhibited improved performance attributed to heightened ion diffusion and increased conductivity. This phenomenon was a result of the concerted synergy between ions and electrons facilitated by a semiconductor nanofluidic channel. Ultimately, we demonstrated an application to showcase real-world viability. In this scenario, electricity was harvested through a smart buoy floating on the water, and, based on this, data from the surrounding environment was sensed and wirelessly transmitted.

The experience with subcutaneous allergen-specific immunotherapy with pollen allergens in patients with atopic dermatitis

BACKGROUND: Atopic dermatitis is a chronic inflammatory skin disease, the key pathogenetic mechanisms of which include activation of T2-immune inflammation, IgE-specific sensitization to various allergens, and disruptions of epidermal barrier functions. Allergen-specific immunotherapy is the only pathogenetic treatment method that can prevent the progression of the disease and the development of the atopic march. Currently, clinical experience has been accumulated in using allergen-specific immunotherapy for atopic dermatitis, yet the existing evidence base does not allow for definitive conclusions regarding the indications for conducting allergen-specific immunotherapy, especially in atopic dermatitis associated with pollen allergy.
 AIMS: Determination of the clinical significance of sensitization to pollen allergens in atopic dermatitis, determination of indications for allergen-specific immunotherapy with pollen allergens and assessment of the effectiveness and safety of this method in atopic dermatitis patients.
 MATERIALS AND METHODS: A comparative controlled study to evaluate the effectiveness of subcutaneous allergen-specific immunotherapy with pollen allergens of birch or cereal grasses in 78 adult atopic dermatitis patients was conducted. A single course of subcutaneous allergen-specific immunotherapy with water-salt solutions of tree pollen allergens was administered to 33 patients, and grass pollen allergens were administered to 21 patients with atopic dermatitis. The comparison group ― patients with atopic dermatitis who received standard therapy for the disease without allergen-specific immunotherapy ― 24 patients. The primary endpoints of the study were to evaluate the effectiveness of therapy based on the reduction in the severity of atopic dermatitis symptoms, based on the absolute and relative number of patients who achieved a reduction in SCORAD score by 75% and IGA 1/0.
 RESULTS: In patients receiving one course of subcutaneous allergen-specific immunotherapy with tree pollen allergens, SCORAD 50 achieved 26, 33, 47% and SCORAD 75 achieved 10, 20 and 33% after 16, 32 and 52 weeks, respectively. In patients who received one course of subcutaneous allergen-specific immunotherapy with grass pollen allergens, SCORAD 50 reached 31, 40, 58% and SCORAD 75 ― 14, 28 and 43% after 16, 32 and 52 weeks, respectively. In the comparison group, the number of such patients was significantly smaller: SCORAD 50 reached 24, 32, 37% and SCORAD 75 ― 13, 22 and 26% after 16, 32 and 52 weeks, respectively. Similar results were obtained when studying the IGA. In all study groups, an improvement in the quality of life of patients was noted, which was reflected in a decrease in the DLQI index by 4 or more points in 12, 25 and 37% of patients receiving one course of subcutaneous allergen-specific immunotherapy with tree pollen allergens, in 14, 28 and 43% in patients after 16, 32 and 52 weeks, respectively. However, the number of such patients in the comparison group was significantly lower: 13, 22 and 26%, respectively.
 CONCLUSION: Allergen-specific immunotherapy is an effective way to treat atopic dermatitis patients, provided there is proven sensitization to pollen allergens.

Molecular dynamics simulations of the effect of starch on transport of water and ions through graphene nanopores.

We use molecular dynamics simulations to unravel the molecular level mechanisms underlying the structure and dynamics of water and ions flowing through nanoporous starch-graphene membranes. Our findings indicate that there is a significant tendency for the formation of short-range order in close proximity to the graphene membrane surface. This leads to a greater concentration of water and ions, suggesting strong interactions between the membrane and the saltwater solution. Furthermore, we found that the starch-graphene membrane was most efficient in sieving out ions when the starch loading is 15 wt.%, and the pore diameter is 14Å. At these conditions, the starch-graphene membrane showed a high water transport rate and maintained a high level of ion rejection. We investigated the effect of loading of starch and the pore diameter on the pressure-induced transport, structure, and dynamics of Na+, Cl-, and water using the GROMACS 2021.4 package. We further analyze the density profiles of water and ions in the context of ion-polymer and water-polymer interactions and provide mechanistic insights into the piston-induced flow of saltwater through the starch-graphene membranes using Visual Molecular Dynamics (VMD) software.

High pressure salt water and low temperature effects on the material performance characteristics of additive manufacturing polymers

The effects of salt water exposure at deep ocean depth pressures when coupled with low temperatures on the material characteristics of three unique additively manufactured polymers has been investigated through a detailed experimental approach. The polymers in the study were manufactured utilizing both Vat Photopolymerization and Material Extrusion printing techniques. The Material Extrusion process was utilized to produce material specimens of Stratasys ULTEM 9085 and Markforged Onyx while the Vat Photopolymerization process was used to produce specimens of Accura ClearVue. The ULTEM 9085 and Markforged Onyx are filament based polymers and the ClearVue is a liquid based resin. The specimens were first submerged in a high pressure, salt water bath of 3.5% NaCl solution at 34.5 MPa (5000 lb/in2) for a total exposure time of 60 days to determine the water absorption characteristics. Subsequent to the salt water exposure at high pressure, the specimens were evaluated to determine changes in tension, compression, flexure, and in-plane fracture properties. To determine the effects of water saturation and low temperature coupling, the mechanical testing was performed at temperatures of 20 °C, 0 °C and −20 °C in both dry and saturated conditions. Additionally, non-destructive testing in the form of TeraHertz and FIRT imaging was conducted to analyze the physical material changes through the thickness of the material due to the saline water absorption. To quantify the change in material storage and loss moduli properties, Dynamic Mechanical Analysis (DMA) characterization was performed on each of the AM polymers in dry and saturated states. The DMA testing also quantified changes in the Glass Transition Temperature because of salt water exposure. In summary, The current study investigates the effects of coupled long term/high pressure salt water exposure with low temperatures on the mechanical and material characteristics of three unique AM polymers by: (1) immersing the materials in a salt water solution at 34.5 MPa for 60 days, (2) Conducting post exposure mechanical testing on the materials at 0 °C and −20 °C with comparisons to 20 °C testing on dry specimens, and quantifies changes in material properties through DMA experiments. The results from all testing in the study show that high pressure salt water exposure when coupled with low temperatures has unique effects on each of the materials considered in the study and careful consideration to each parameter must be given based on the material type when components will be employed in marine operations.

Design and analysis of a solar‐powered refrigeration system with thermal energy storage for efficient storage of scorpion antivenom

AbstractThis study investigates the use of a saltwater (sodium chloride and water) solution as a phase change material (PCM) in a small fridge for storing scorpion antivenom in Sudan's northern state. The experimental results demonstrate the effectiveness of the PCM in maintaining suitable storage temperature which 3 ± 2°C. By adding salt to the water, the freezing point decreased, enabling the solution to absorb more heat energy because the heat capacity of the saltwater solution is higher than the saltwater ice phase. The base case maintained (2310 g of water only) an average temperature of 9.5°C, while Case 1 (35 g of salt in 2310 g of water) reached 7°C and Case 2 (70 g of salt in 2310 g of water) achieved 5°C. Increasing the amount of saltwater solution led to improved heat absorption. Case 5 (70 g of salt in 4950 g of water) achieved an optimal storage temperature of 4°C. The relationship between outside and inside temperatures showed stable maintenance after initial melting, with a slight increase of approximately 1.5°C. These findings demonstrate the potential of solar‐powered fridge with PCM for reliable medication storage in remote areas. By optimizing salt concentration and quantity, temperature‐sensitive medications can be stored effectively, improving availability and quality.

Investigation of the influence for S-ions incorporated into the Ag2ZnSnSe4 photoelectrodes on their light-enhanced activities in aqueous salt-water solution

BackgroundLarge-scale application in solar salt-water splitting is an important way to reduce the influence of environmental problem without any decrease in the usage of energy. To develop the photoelectrochemical (PEC) salt-water splitting is thus a promising way for further industrial application. MethodsThe Ag2ZnSnSe4 (AZTSe) and their S-ions incorporating samples were produced by the post selenization/sulfurization of Ag/Sn/Zn sandwich metal precursors with the suitable amount of sulfur + selenium powder mixtures at 410 ℃ for 90 min under nitrogen atmosphere. The PEC tests using samples as photoelectrode were then carried out. Significant findingsThe maximum light-enhanced activity of pristine AZTSe and their S-ions incorporated samples was 3.65 and 2.37 mA/cm2 as the applied voltage of 1.23 V vs. RHE (relative hydrogen electrode) in a 0.5 M sodium chloride electrolyte, respectively. Electrochemical impedance and intensity-modulated photocurrent spectra of samples represented that the S-ions incorporated into AZTSe sample could reduce the photo-corrosion reaction on sample surface because of the decrease in the number of light-induced holes occupied on sample surface. Our report proposed the systemic evaluation on the influence of S-ions incorporated into AZTSe sample for light-enhanced salt-water splitting.

EVOLUCIÓN TECNOLÓGICA DE LOS ELECTROLIZADORES PARA LA PRODUCCIÓN DE HIDRÓGENO

Electrolysis is a chemical process that uses electric current to carry out chemical reactions. It was first discovered by the British scientist Michael Faraday in 1833, who conducted a series of experiments in which he passed an electric current through solutions of salts in water. He found that positively charged ions, known as cations, moved towards the negative electrode (anode), while negatively charged ions, known as anions, moved towards the positive electrode (cathode). Faraday also showed that the amount of substance deposited on the electrodes during electrolysis is proportional to the intensity of the electric current and the time of application.

Investigation into the adhesion properties of PFAS on model surfaces

PFAS adhesion measured on siloxane films increased in divalent cation solutions compared to deionized water and monovalent salt solutions.

The effect of biologically active substances on BSA and on the textures of films obtained by drying water-salt solutions of BSA

In the previously published results, we studied the effect of flavin mononucleotide (FMN), sodium halides NaF and NaBr, iron chloride FeCl3 and aluminum chloride AlCl3 on zigzag patterns of films obtained from saline solutions of bovine serum albumin (BSA). Changes in the properties of the biopolymer and its aqueous environment in solutions were monitored by UV absorption and fluorescence spectroscopy, microwave dielectrometry and dynamic light scattering. This work summarizes the obtained results on the influence of components of various nature on BSA and its film textures. Changes in the parameters of zigzag patterns are associated with polydispersity due to the presence of colloidal particles, aggregates and FMN associates, as well as a decrease in the surface potential and BSA hydration. The possibility of predicting the character of the influence of the studied biologically active substances on BSA is analyzed.