Microscopic Point Research Articles

Influence of Ferronickel Slag on Impermeability of Seawater‐Corroded Cement Soil Using an Electrochemical Test

Since the traditional penetration testing of cement soil is time‐consuming, this paper introduces a new electrochemical testing method to study the effect of ferronickel slag powder on improving the impermeability of cement soil in the corrosive seawater environment. To this end, the mercury intrusion test was employed to analyze the change in the pore characteristics of cement soil, and the variation in the impermeability of cement soil was further explained from a microscopic point of view. The test results show that using the electrochemical method to test the impermeability of cement soil dramatically improves the efficiency of testing. The impermeability of cement soil gradually rises with an increase in its ferronickel slag powder content. Moreover, the optimal mass replacement ratio of the ferronickel slag powder and mineral powder composite to cement is 40% in the testing range of 0–40%. The mercury intrusion test results also confirm that the addition of ferronickel slag powder can decrease the most probable pore size and total porosity of cement soil; further, from a microscopic perspective, the ferronickel slag powder can help reduce the corrosion of cement soil by seawater. The above test conclusions are consistent with the results of the traditional permeability test. Our findings not only imply that ferronickel slag powder can lessen the effect of seawater on the corrosion of cement soil but prove that the electrochemical test is a reliable and straightforward method for determining the impermeability of cement soil.

Research on Dynamic Constitutive Model and Fracture Characteristics of Two High Strength Steels

58SiMn and 50SiMnVB are commonly used shell materials in bombs, and their dynamic constitutive model and fracture properties directly determine the mass distribution of the bomb. Tensile tests were carried out on two high-strength steels, and the parameters of the yield point, tensile strength and plastic failure strain as well as the John-Cook model were determined. The fracture morphologies of the two steels in the quasi-static tension and in the dynamic tension were analyzed. The research results show that the yield strength of 58SiMn steel remains unchanged with increasing strain rate. The yield strength and tensile strength of 50SiMnVB increase as the rate of elongation increases, and the ability to plastically deform decreases, which shows the properties of embrittlement under high speed loading. With the same elongation rate, 50SiMnVB steel has higher strength and toughness. 58SiMn steel is a tensile brittle fracture from a macroscopic point of view and a quasi-split fracture from a microscopic point of view; 50SiMnVB steel is a mixed lap shear fracture under axial tensile load. With increasing loading rate, the tensile fracture tends to pure shear fracture.

The Creep Test Study and Macro‐Detail Analysis of Argillaceous Red Sandstone in Different Water‐Containing States

In order to study the creep characteristics and failure mechanism of argillous red sandstone in a water‐bearing state, uniaxial creep tests of argillous red sandstone under dry and saturated states are carried out under fractional loading. Burgers model is used to fit the test results and identify the parameters, and scanning electron microscopy is carried out on the cross section of the damaged sample. The mechanism of creep difference of argillaceous red sandstone with different water content is studied from the microscopic point of view. The results show that the uniaxial compressive strength of the saturated clay red sandstone is 46% of that of the dry clay red sandstone. The deformation level of the saturated clay red sandstone is lower than that of the dry clay red sandstone. The limit deformation of the creep failure of the water‐bearing clay red sandstone is much smaller than that of the dry clay red sandstone. The long‐term strength of the muddy red sandstone is 46.4 MPa in the dry state and only 14.1 MPa in the saturated state, as calculated at the steady‐state creep rate. It is found that the Burgers model can describe the attenuation and stable creep of muddy red sandstone well. Through macro‐ and microanalysis, it is found that the compression failure form of argillaceous red sandstone belongs to x‐shaped conjugate inclined plane shear failure. After saturation, the internal pores of argillaceous red sandstone become larger, and the cementation ability decreases, resulting in the decrease of rock sample strength.

Damage and Deterioration Model of Basalt Fiber/Magnesium Oxychloride Composites Based on GM(1, 1)-Markov in the Salt Spray Corrosion Environment

This study was designed to solve the problem of magnesium hazards due to potash extraction in the salt lake region. Using basalt fiber (BF) as the reinforcement material and magnesium oxychloride cement (MOC) as the gelling material, a BF/MOC composite material was prepared. Firstly, the effect of BF addition content on the basic mechanical properties of the composites was investigated. Then, through the salt spray corrosion test, the durability damage deterioration evaluation analysis was carried out from both macroscopic and microscopic aspects using mass change, relative dynamic modulus of elasticity (RDME) change, SEM analysis and FT-IR analysis. Finally, a GM(1, 1)-Markov model was established to predict the durability life of composite materials by using durability evaluation indicators. The results show that: when the BF content is 0.10% (by volumetric content), the composites have the best mechanical properties and resistance to salt spray corrosion. However, when the volume of BF content exceeds 0.10%, a large number of magnesium salt crystallization products are observed from the microscopic point of view, and the corrosion of the main strength phase of MOC is more serious. The prediction results of the GM(1, 1)-Markov model are highly identical with the raw data. In addition, using the change of RDME as a predictor, RDME is more sensitive to environmental factor compared to the change of mass. Predictions using the change of RDME as a threshold indicate that MOC-BF0.10 has the longest durability life, which is 836 days. The model is important to promote the application of MOC composites in the salt lake region and to promote the healthy development of green building materials.

Study of cytoskeleton from microscopic point of view: Our experience

The manuscript deals with our studies and experiences in the assessment of cytoskeleton in different cellular models and situations. The immunofluorescent study of several cytoskeletal proteins was relevant in the evaluation of a therapy for osteoarthritis, in case of alkaptonuria and in testing the efficacy of docetaxel in neuroblastoma cancer cells leading to apoptosis. A relevant part of our experience focus on the study of cytoskeleton in seminiferous epithelium and spermatozoa, identifying alterations affecting blood-testis barrier after a silver nanoparticle treatment, chromosomal segregation in case of varicocele, sperm motility and diagnosing systematic sperm defects as “Primary ciliary dyskinesia” and “Dysplasia of the fibrous sheath”. The evaluation of cytoskeleton represents a specific and sensitive analysis in establishing the health status of different cells.

Study on Properties of Blue-Brick Masonry Materials for Historical Buildings

There are a large number of historic buildings which were mainly made of blue-brick masonry in today’s world. However, for the natural and man-made reasons, these historic buildings have been damaged in different degrees. In order to protect historic buildings more scientifically and learn about the preservation state of existing historic buildings, it is necessary to ascertain the material properties of blue brick in historic buildings. The article takes the blue bricks of historical buildings in Kaifeng area of the Central Plains as an example to study. Through the analysis of physical properties, X-ray fluorescence spectroscopy, X-ray diffraction and scanning electron microscopy of blue brick specimens, the physical properties such as the apparent density, moisture content, porosity, and material structure composition are understood. The results show that the apparent density of blue brick is 1.64 g/cm3 , the moisture content is 10.23%, the 24 h atmospheric water absorption is 17.86%, and the porosity is 20.99%. The smaller the apparent density is, the larger the porosity is, and the water absorption performance is better. From the microscopic point of view, bonding ability between blue brick mineral particles is relatively weak. The pores between skeletons are large and the pore structure is obvious. From the perspective of material phase, the elements of blue brick are mainly O, Si, Al, Fe, and the composition of blue brick is mainly composed of quartz and feldspar. The softening coefficient of blue brick is 0.80, and the deformation and stability of the structure should be paid special attention in the rainy season or wet environment. Through the frost test, there are salt substances in the internal pores of the brick, and the surface of the blue brick is eroded and pulverized. In this paper, the experimental process and analysis methods for testing the material properties of blue brick can provide reference for the research on the material properties of the same kind of blue-brick masonry in historic buildings and masonry relics. The relevant material property parameters obtained in this paper can provide guidance for making protection schemes and scientific repairs for historic buildings in Central China, enrich the evaluation criteria for maintaining and reinforcing historic buildings, and provide theoretical support for studying the damage and health detection technology related to historic buildings.

Quantitatively study on imbibition of fracturing fluid in tight sandstone reservoir under high temperature and high pressure based on NMR technology

Reservoir fracturing is one of the main technical means to realize high-efficiency development of low-permeability tight reservoirs in oil fields. With the implementation of reservoir fracturing measures, the imbibition effect is produced after the interaction between fracturing fluid and rocks in oil reservoirs. It is of great guiding significance to study the imbibition mechanism of fracturing fluid and quantitatively evaluate the imbibition effect of fracturing fluid with different pore throats under different conditions for practical development. In this paper, to reveal the mechanism of fracturing fluid imbibition from a microscopic point of view, based on the simulation of high temperature and high-pressure reservoir environment, using nuclear magnetic resonance (NMR) technology and dynamic physical simulation experiments, we quantitatively evaluated the imbibition effect of fracturing fluid with different pore throats at different times and investigated the influence of permeability, wettability, and viscosity of fracturing fluid on imbibition effect of fracturing fluid. The results show that the scale of imbibition of fracturing fluid is between 0.10 ms–51.20 ms. Additionally, the imbibition rate is the fastest in the initial stage of imbibition. Furthermore, the imbibition takes place in micropores (0.10 ms–1.00 ms) first, and then enters mesopores (1.00 ms–10.00 ms), followed by macropores (>10.00 ms) as the reaction time goes on. Also, micropores (0.10 ms–1.00 ms) are the best contributors to the imbibition effect of fracturing fluid, and the imbibition effect tends to be stable at first, followed by mesopores (1.00 ms–10 ms), with the highest contribution, but its imbibition effect is relatively lagging. Last, the imbibition efficiency is positively correlated with permeability, negatively correlated with fracturing fluid viscosity. It is also related to wettability. The imbibition effect of hydrophilic type is better than that of oleophilic type. The more hydrophilic the rock is, the better the imbibition effect is, and the imbibition stability time of the hydrophilic type lags behind that of the oleophilic type.

Formation mechanism of a silicon-on-nothing structure using the level-set approach and molecular dynamics

The purpose of this article is to simulate the formation mechanism of the SON structure. Based on the silicon atom surface diffusion theory, we simulated the formation of a silicon-on-nothing (SON) structure using the “Level-Set” module in the COMSOL Multiphysics® software. From a macroscopic perspective, we analyzed the influence of the initial trench size and heating time on the formation of the SON structure. In addition, we used molecular dynamics simulation to study the migration process of silicon atoms during RTP (rapid temperature processing) for the formation of a SON structure from a microscopic point of view. Finally, we fabricated the SON structure under high vacuum at a temperature of 1150 °C. The SON formation process in the experiment is consistent with the simulation results, which verifies the correctness of the theoretical model used in the simulation and the rationality of the inference on the formation mechanism of the SON structure. This work will provide a reference for the fabrication of the SON structure.

Nano-Modified Meta-Aramid Insulation Paper with Advanced Thermal, Mechanical, and Electrical Properties

Molecular dynamics simulations were used to analyze the internal mechanism for the observed improvement in performance of nano-modified meta-aramid insulation paper from a microscopic point of view. The results showed that the k-polyphenylsilsesquioxane(PPSQ) modified meta-aramid insulation paper was superior to b-PPSQ modified meta-aramid insulation paper in terms of its thermal stability and mechanical and electrical properties. The analysis of microscopic parameters showed that the stiffness of k-PPSQ was less than that of b-PPSQ, and the hydroxyl groups on the open-loop system were more likely to enter the dispersed system, resulting in higher bonding strength, meta-aramid fiber chains between k-PPSQ molecules, and the formation of hydrogen bonds. Additionally, the nano-enhancement effects of k-PPSQ and b-PPSQ resulted in various improvements, including a reduction in pores between molecules in the blend model, an increase in the contact area, the formation of interfacial polarization, and a reduction in defects at the interface.

Experimental study on mechanical properties and microstructure of metakaolin based geopolymer stabilized silty clay

Geopolymer is an environmentally friendly green building material with fast hardening, high strength, low shrinkage, low cost, and low carbon dioxide emission. Based on the above characteristics of geopolymer, this study aims to explore the feasibility of taking geopolymer as a new choice for silty clay foundation treatment. In this study, unconfined compressive strength tests, scanning electron microscopy (SEM), and X-ray energy dispersive spectroscopy (EDS) experiments were carried out on silty clay stabilized by metakaolin based geopolymer (MKG). The influences of metakaolin content, modulus, and concentration of alkali activator on the mechanical properties of geopolymer stabilized soil were discussed. The mechanism of MKG improving the soil strength was also discussed from the microscopic point of view. The result showed that when the modulus of alkali activator is 1.3, the concentration is 40%, and the mixed mass of metakaolin is 1.2 times that of alkali activator, MKG stabilized soil showed higher unconfined compressive strength (UCS). Through comparative tests with untreated plain soil, lime stabilized soil and ordinary Portland cement stabilized soil, the strength performance and stabilizing effect of MKG stabilized soil were further studied. MKG has an obvious effect on improving the UCS of soil, and its mechanical indexes including UCS, Young's modulus, failure strain were also enhanced compared with samples stabilized with lime and ordinary Portland cement. SEM observation confirmed the formation of cementitious materials in the stabilized soil sample, the soil showed a more uniform and denser microstructure after treatment with MKG. Through EDS energy dispersion spectroscopy analysis, it is not easy to cause salt swelling damage with no large amount of calcium ions in the sample. This experimental study indicated that MKG can be an effective soil solidification agent for silty soil.

Nanoindentation-Based Three-Parameter Fracability Evaluation Method for Continental Shales

Shale fracturing evaluation is of great significance to the development of shale oil and gas resources, but the commonly used shale evaluation methods (e.g., the method using the brittleness index based on mineral composition or elastic parameters) have certain limitations. Fractures and beddings affecting fracturing are not considered in these methods. Therefore, it is necessary to develop a new method to evaluate fracturing more comprehensively. The samples used in this research were taken from four typical continental shale basins of China, namely the Bohai Bay Basin, the Ordos Basin, the Songliao Basin, and the Junggar Basin. From a microscopic point of view, a three-parameter evaluation method involving multi-dimensional factors has been developed based on the nanoindentation method. Then, the fracturing coefficient K2 is obtained by combining the ratio β of the fracture indentation to the total indentation and the uneven coefficient m. After that, the fracability coefficient K3 is the ratio of the elastic modulus parallel to bedding to that perpendicular to bedding. Finally, the correlation between fracability coefficients K1, K2, and K3 is used to evaluate the overall fracturing performance of shale. The results of this evaluation method are in good agreement with the actual fracturing performance. It can be concluded that this method is highly reliable and practical and well worthy of promoted applications.

Dynamic Simulation Based on a Simplified Model of 1/3 Coking Coal Molecule and Its Formation Characteristics of Hydration Films.

To comprehensively elaborate the formation characteristics of hydration films on 1/3 coking coal molecule, this paper reports the construction of a realistic simplified model for calculations of electrostatic potentials on the coal molecular surface to foresee the major immersion locations. On this basis, interactions at the interface of coal molecules with different numbers of water molecules and their effects on each functional group of coal molecules were investigated. Using the scanning electron microscopy experiment, changes in the coal matrix before and after water leaching were compared and analyzed by fractal dimension calculations. Hydration characteristics of coal were described from a combined macroscopic and microscopic perspective. The results showed that both positive and negative electrostatic potential of coal molecules occurred near the O-containing functional groups. The hydroxyl group’s electrostatic potential (−OH) rose, resulting in higher electrostatic potential in coal–water molecules and providing many immersion sites. Deficiency in water molecules led to the complete immersion of water molecules. The interface of coal molecules could not be covered entirely, which led to the low number of active sites and Z values. The interface of coal–water molecules did not affect the average bond lengths of water molecules but decreased the bond angle by 3–4°. The influence ofwater molecules on the −OH groups of coal molecules was the most prominent when water molecules were incorporated into the coal molecules. Water damage for the coal matrix is more pronounced than in the raw coal itself. In view of above research, the formation characteristics of the hydration film from a microscopic point of view explained that the initial hydration of coal molecules was owing to H-bonds. From a macroscopic perspective, it was mainly due to structure changes for the coal matrix. This provides valuable references for field experiments in hydraulic fracturing and perforation.

Removal of Trimethoprim from Water using Carbonized Wood Waste as Adsorbents

Daniellia—oliveri sawdust-based adsorbents were employed to remove trimethoprim (TMP) from water. The sawdust was thermally carbonized and activated in-stu with ZnCl2 and H3PO4 separately. The adsorbents surface features were profiled using scanning electron microscopic (SEM) and pH point of zero charge (pHpzc ) analyses. The prospects of the adsorbents for the removal of trimethoprim from water were verified. The adsorption processes were performed under different experimental conditions. The adsorption isotherm, the kinetics, and the thermodynamics were studied; and the data fitting output revealed that both chemisorptions and physisorption occurred. Surface and pore diffusion played active role in the adsorption of TMP by the adsorbents. The optimum conditions for adsorption of TMP by the adsorbents were pH at slightly acidic to neutral medium and temperature at room temperature. The fitting isotherm models were: Langmuir (R2 = 0.993) for the zinc-chloride-activated-carbon, Temkin (R2 = 0.962) for the phosphoric-acid-activated-carbon, and the kinetics: pseudo-second order (R2 = 0.997) for both. The maximum monolayer adsorption capacities of the adsorbents for TMP was 4.115 and 6.495 mg/g, respectively. The thermodynamic parameters determined suggested feasibility, spontaneity, and endothermicity of the adsorption processes. The results reveal that the adsorbents were goodprospects for the removal of TMP from water.

Magnetic domain reversal induced by thermal activation in SmCo alloy

The SmCo alloys are widely used in the field of precision instruments and high temperatures due to their excellent temperature stability. At present, the effect of high temperature on the domain structure of SmCo alloy lacks sufficient study. In this paper, the effect of temperature on the magnetic domain of type 2:17 SmCo alloy was investigated by domain structure observation and micromagnetic simulation. After heating at 240 ℃ and 300 ℃, the reverse domains could be observed on the surface of the magnet, and the domains nucleated at the center region of the grains and then expanded into maze domains. The in-situ heating test using Lorentz electron microscope confirms, from a microscopic point of view that thermal activation causes irreversible movement of the walls of the domains. It was found by the comparison between batch heating tests and continuous heating tests that part of the inverted domains are unstable during the cooling from high temperature down to room temperature, and the micromagnetic simulation results verified that without the temperature field and magnetic field, the unstable inverted domains would disappear under the influence of the interaction, and the domains pinned by the phase boundary will be stably retained. The micromagnetic simulation results reveal that the nucleation sites of the reverse domains in the SmCo alloy are at the intersection of the 2:17R phase and Zr-rich phase, which is due to the lower pinning field of the Zr-rich phase.

Molecular dynamics simulation to enhance the mechanical and tribological properties of polyimide composites by graphene reinforcement

Background: Polyimide is one of the organic polymer materials with the best comprehensive performance. It has outstanding mechanical properties, excellent thermal stability and excellent corrosion resistance, but pure polyimide has high coefficient of friction and wear rate. By combining graphene with polyimide, the mechanical properties of the composite are significantly reformatived, and the friction coefficient and wear rate can be reduced. Objective: The molecular models were developed to study the mechanical and tribological properties of graphene as a reinforced material. Methods: In this paper, the mechanical properties and friction and wear mechanism of materials are studied by molecular dynamics method from the microscopic point of view. The Young’s modulus and hardness of composites were calculated using the strain constant method. Results: Molecular dynamics simulation results expressed that the Young’s modulus and hardness of polymer composites benefited by approximately 115% and 42%, respectively, after the addition of the graphene-reinforced material. The average friction coefficient and wear rate of polymer composites fall by 35% and 48%, respectively. Through the calculation and statistics of the micro-information in the process of friction simulation, the internal mechanism of various situations is revealed in the atomic dimension. Conclusions: Graphene can adsorb on the surface of polymer chain segment, a strong polymer matrix, through van der Waals and electrostatic forces and can effectively resist external loading.

Effect of anionic/nonionic surfactants on the wettability of coal surface

To study the effect of different surfactants on the wettability of coal surface, the adsorption simulation of different coal-surfactant-water model systems was carried out by using materials Studio 8.0 molecular simulation software. Combined with the contact angle experiments between different surfactants and coal samples, the effect law of different surfactants on the wettability of three coal samples was obtained. The adsorption simulation results were analyzed from the aspects of adsorption spacing, adsorption sites and “reverse adsorption” phenomenon, and the mechanism of the influence of different surfactants on the wettability of coal surface was revealed from a microscopic point of view. The research results show that: the higher the degree of coal metamorphism, the lower the water absorption and the worse the wettability of coal. Anionic surfactant SDBS has better effect on improving the wettability of Hami (HM) coal with low metamorphic degree, while nonionic surfactant AEO9 has better effect on improving the wettability of Yuwu (YW) and Tunliu (TL) coal with high metamorphic degree. By comparing intermolecular distances, it is shown that nonionic surfactants are more likely to aggregate on the surface of coal molecules and have a greater effect on the wettability of the coal surface. The middle position of the benzene ring structure of coal is the best adsorption site for the hydrophobic tail of the surfactant. By calculating the adsorption energy of different simulation systems, it is confirmed that the phenomenon of “reverse adsorption” between nonionic surfactants and low metamorphic coal is caused by hydrogen bonding. The results of the study provide a theoretical basis for the effective application of different surfactants in coal dust control.

Tutorial on elastic interaction models for multistep spin-crossover transitions

Spin-crossover (SC) compounds are fascinating materials that exhibit colorful phase transitions induced by temperature, pressure, photoirradiation, etc. From the microscopic point of view, the electronic (spin) state of a molecule changes between the low-spin (LS) and high-spin (HS) states by such stimuli, and a variation of the molecular size follows through the vibronic coupling between the electronic state and structure in the molecule. This causes an elastic distortion and then an elastic interaction. The elastic interaction is essential in cooperative properties of SC phenomena. In this paper, we present a tutorial study on elastic interaction models for SC phenomena, which are the recent trend of modeling of SC compounds. We focus on multistep transitions, which are a topic of SC phenomena. We analyze the phase diagrams including the metastable phases for several SC systems, in which antiferromagnetic-like and ferrimagnetic-like phases are associated in addition to the LS and HS phases. Making use of the phase diagrams, we show various patterns of thermally induced SC transition with steps. We also investigate SC transitions with steps in a core-shell SC nanocomposite composed of two different SC compounds. We focus on two cases: the core has a lower transition temperature than the shell, and the core has a higher transition temperature. We show characteristic features of difference in the two systems.

Surface Morphology and Microstructure Evolution of Single Crystal Diamond during Different Homoepitaxial Growth Stages.

Homoepitaxial growth of step-flow single crystal diamond was performed by microwave plasma chemical vapor deposition system on high-pressure high-temperature diamond substrate. A coarse surface morphology with isolated particles was firstly deposited on diamond substrate as an interlayer under hillock growth model. Then, the growth model was changed to step-flow growth model for growing step-flow single crystal diamond layer on this hillock interlayer. Furthermore, the surface morphology evolution, cross-section and surface microstructure, and crystal quality of grown diamond were evaluated by scanning electron microscopy, high-resolution transmission electron microcopy, and Raman and photoluminescence spectroscopy. It was found that the surface morphology varied with deposition time under step-flow growth parameters. The cross-section topography exhibited obvious inhomogeneity in crystal structure. Additionally, the diamond growth mechanism from the microscopic point of view was revealed to illustrate the morphological and structural evolution.

비트코인과 『베니스의 상인』: 환원적 디지털 기술과 경제의 대안으로서의 문학 서사

Bitcoin, which appeared for the purpose of solving the problems concerning the traditional currency, rather brought about a new problem that we are experiencing for the first time. This paper attempts to rethink the problem of Bitcoin by summoning one of Shakespeare’s narratives, The Merchant of Venice. First, we will look at the problem of money and trust in the capitalist system, and examine the possibility of literary narratives as an alternative to reductive economics and digital technology. Then, it will reinterpret the Bitcoin technical white paper of Satoshi from a narrative perspective and reveal the utopian fiction within. Finally, while reading Bitcoin anew through the literary narrative of The Merchant of Venice, this paper probe a way in which a literary work constructs an irreducible perspective by combining the macroscopic technological/economic point of view and the microscopic human point of view.

Molecular dynamics simulation of thermodynamic properties and local structure of Na2CO3-K2CO3 eutectic salt during phase transition

In this paper, the thermodynamic properties and local structure of Na2CO3-K2CO3 eutectic salt were simulated by using Born Mayer potential function. The phase transition temperature, solid specific heat capacity (Cp), liquid Cp and density of Na2CO3-K2CO3 eutectic salt were obtained by molecular dynamics calculation. Compared with the experimental results, the error of phase transition temperature, solid Cp(550K-650 K) were 6.32% and 1.61% respectively, which verified the accuracy and reliability of MD simulation method. Moreover, the local microstructure of Na2CO3-K2CO3 eutectic salt was characterized by radial distribution functions (RDF) and angular distribution functions (ADF), combined with the simulated results of the thermodynamic properties, revealed the variation of Cp, density, coefficient of thermal expansion and viscosity with the increasing temperature. Furthermore, the change of ions during the solid-liquid phase transition of Na2CO3-K2CO3 eutectic salt was analyzed from the microscopic point of view, and the microstructure of Na2CO3-K2CO3 eutectic salt in the solid-liquid phase was obtained.