Capacitance method dielectric constant test system

Abstract

The utility model discloses a capacitance method dielectric constant test system, which comprises a reaction kettle, a constant temperature oil bath pan, a data acquisition unit, a computer, a capacitance tester, a temperature transmitter, a pressure sensor and a capacitance test clamp assembly, and is characterized in that the reaction kettle is arranged in the constant temperature oil bath pan and is provided with a sealing cover; the measuring ends of the temperature transmitter, the pressure sensor and the capacitance tester are all arranged in the reaction kettle, the signal output ends of the temperature transmitter and the pressure sensor penetrate through the sealing cover to the outside of the constant-temperature oil bath pan and are connected with the input end of a data collector, the output end of the data collector is connected with a computer, and the computer is connected with the constant-temperature oil bath pan. The input end of the capacitance tester is connected with the capacitance test clamp assembly, and the output end of the capacitance tester is connected with the computer. The test system provided by the utility model simplifies test equipment, is accurate and reliable in measurement result, and can be used for measurement under high-temperature and high-pressure conditions.

Description

Technical Field

[0001] The utility model belongs to the technical field of new energy and energy-saving, and specifically relates to a capacitance method dielectric constant testing system. Background Art

[0002] Contributions to the dielectric constant can come from ionic conduction, dipole relaxation, atomic polarization, and electronic polarization, each of which dominates at different frequencies of the electric field. Many physicochemical properties of solutions are directly affected by ion-solvent, cation-anion, and solvent-solvent interactions. Therefore, the dielectric constant has become a key parameter for synthesizing materials or designing reactions in solution. In addition, the dielectric constant can also affect the equilibrium state of chemical reactions, indicating that it also plays an important role in chemical reactions.

[0003] The dielectric constant of electrolytes is a key physical quantity that describes the properties of dielectrics in electrolyte solutions under the influence of electric fields. It not only affects the electrical properties of materials and the effectiveness of energy storage applications, but also directly influences the equilibrium and progress of chemical reactions. Therefore, studying and understanding the dielectric constant of electrolyte solutions has far-reaching implications for the design of new materials, the control of chemical reactions, and the development of energy storage technologies.

[0004] The dielectric constant of electrolytes has important applications in many fields. First, in electrochemical engineering, accurate measurement of the dielectric constant of electrolytes is crucial for the design and performance optimization of energy storage devices such as batteries and supercapacitors. Second, in chemical analysis, changes in the dielectric constant of electrolytes can be used to determine and analyze ion concentrations in solutions. Furthermore, in the biomedical field, the study of the dielectric constant of electrolytes is crucial for understanding the properties and functions of electrolyte solutions in living organisms.

[0005] The dielectric constant of electrolytes is affected by a variety of factors, including solvent polarity, solute concentration, temperature, and the strength of the applied electric field. Currently, dielectric constant measurements can be performed using methods such as the dielectric constant meter method, the capacity ratio method, and the refractometer method. However, the accuracy of the test systems used in these methods needs to be improved, and they are unable to perform measurements in high-temperature and high-pressure environments. Utility Model Content

[0006] In response to the above technical problems, the present invention provides a capacitance method dielectric constant testing system, which can effectively make up for the shortcomings of the existing testing system in the art, such as the lack of accuracy and the inability to perform testing in high temperature and high pressure environments.

[0007] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0008] A capacitance method dielectric constant testing system, characterized in that: the system mainly includes a reactor, a constant temperature oil bath, a data acquisition device, a computer, a capacitance tester, a temperature transmitter, a pressure sensor and a capacitance test fixture assembly; the data acquisition device, the capacitance tester and the computer are all located outside the constant temperature oil bath; the reactor is arranged in the constant temperature oil bath, and the reactor is provided with a sealing cover; the measuring ends of the temperature transmitter and the pressure sensor are both arranged in the reactor, and the signal output ends of the temperature transmitter and the pressure sensor pass through the sealing cover to the outside of the constant temperature oil bath and are connected to the input end of the data acquisition device, and the output end of the data acquisition device is connected to the computer; the measuring end of the capacitance tester is connected to the capacitance test fixture assembly, the capacitance test fixture assembly is located in the reactor, and the output end of the capacitance tester is connected to the computer.

[0009] Furthermore, a complex electrolyte solution is provided in the reactor, and the measuring ends of the temperature transmitter, the pressure sensor and the capacitance tester are all arranged below the liquid level of the complex electrolyte solution.

[0010] Furthermore, during the normal temperature experiment, a magnetic stirrer for the experiment is provided at the bottom of the reactor, and the main body of the magnetic stirrer is wrapped and sealed by a waterproof bag.

[0011] Furthermore, the capacitance test fixture assembly clamps and fixes a parallel plate capacitor.

[0012] The utility model utilizes the principle of parallel plate capacitors, measures the capacitance value of the parallel plate capacitor in an electrolyte solution and in a vacuum through the capacitance tester, compares the two capacitance values, and calculates the dielectric constant of the electrolyte solution. The specific steps are as follows: prepare a parallel plate capacitor with known plate size and spacing, clamp it in a complex electrolyte solution with the capacitance test fixture assembly, and measure its capacitance value C' with the capacitance measuring instrument; then measure the capacitance value of the parallel plate capacitor in the absence of an electrolyte solution, that is, its capacitance value C0 in a vacuum; finally, using the calculation formula C = εS / 4πkd of the parallel plate capacitor capacitance, where ε is the dielectric constant of the medium, S is the plate area, d is the spacing between the two plates, and k is the electrostatic force constant, compare the two measured capacitance values, and the dielectric constant ε' = C' / C0 of the electrolyte solution can be obtained.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] First, a sealing cover is provided on the reactor of the test system of the present invention, which can prevent air from entering the test solution during testing, thereby ensuring the purity and stability of the test solution, and thus ensuring the accuracy and precision of the test results; second, the test system can expand the test conditions of the dielectric constant of the electrolyte solution to high temperature and high pressure, with the temperature reaching 485.15K and the pressure reaching 5.0MP; in addition, this method of using the test system provided by the present invention to test the dielectric constant of the electrolyte solution is simple and easy, and is applicable to most solid and liquid media. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a schematic diagram of the structure of the capacitance method dielectric constant testing system provided by the utility model;

[0016] Explanation of the numbers in the figure: 1. Constant temperature oil bath, 2. Reactor, 3. Magnetic stirrer, 4. Data collector, 5. Computer, 6. Capacitance tester, 7. Capacitance test fixture assembly, 8. Temperature transmitter, 9. Pressure sensor, 10. Sealing cover. DETAILED DESCRIPTION

[0017] The present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0018] like Figure 1 As shown, the utility model provides a capacitance method dielectric constant testing system, which mainly includes a reactor 2, a constant temperature oil bath 1, a data collector 3, a computer 5, a capacitance tester 6, a temperature transmitter 8, a pressure sensor 9 and a capacitance test fixture assembly 7; the reactor 2 is arranged in the constant temperature oil bath 1, and the reactor 2 is provided with a sealing cover 10; the measuring ends of the temperature transmitter 8 and the pressure sensor 9 are both arranged in the reactor 2, and the signal output ends of the temperature transmitter 8 and the pressure sensor 9 are both connected to the input end of the data collector 4, the output end of the data collector 4 is connected to the computer 5, the measuring end of the capacitance tester 6 is connected to the capacitance test fixture 7, and the output end of the capacitance tester 6 is connected to the computer 5.

[0019] A complex electrolyte solution is provided in the reactor 2 , and the measuring ends of the temperature transmitter 8 , the pressure sensor 9 and the capacitance tester 6 are all arranged below the liquid level of the complex electrolyte solution.

[0020] The capacitor clamp assembly 7 clamps and fixes a parallel plate capacitor.

[0021] During the experiment at room temperature, a magnetic stirrer 3 is provided at the bottom of the reactor 2, and the main body of the magnetic stirrer 3 is wrapped and sealed with a waterproof bag.

[0022] The temperature of the system is adjusted and stabilized by the constant temperature oil bath 1, and the reactor 2 is made into a closed space by adding a sealing cover 10 to the reactor 2, so that the test solution reaches a thermodynamic equilibrium state, thereby ensuring accurate and reliable measurement.

[0023] Example 1

[0024] The CuCl2 aqueous solution was prepared by weighing method. The specific process was as follows: in a clean room environment at 25°C, deionized water and analytical grade CuCl2 were weighed using a high-precision electronic balance, and the CuCl2 aqueous solution was prepared in a clean glass container equipped with an electronic stirrer.

[0025] The above-mentioned capacitance method dielectric constant test system was used to measure the liquid phase electrostatic dielectric constant of CuCl2 aqueous solution at a pressure of 1 atm and a temperature of 298.15K. The test results are shown in Table 1:

[0026]

[0027] Table 1

[0028] The data under conventional testing were compared with the data results in existing literature (Vera, JH; Wilczek-Vera, G. Classical Thermodynamics of Fluid Systems: Principles and Applications. CRC Press: New York, 2016.), and the deviation was within 1.52%.

[0029] Example 2

[0030] The MnCl2 aqueous solution was prepared by a weighing method. The specific process was as follows: in a clean room environment at 25°C, deionized water and analytically pure MnCl2 were weighed using a high-precision electronic balance, and the MnCl2 aqueous solution was prepared in a clean glass container equipped with an electronic stirrer.

[0031] The dielectric constant of the above-mentioned MnCl2 aqueous solution under high temperature and high pressure was tested using the above-mentioned capacitance method dielectric constant test system. The test results are shown in Table 2:

[0032]

[0033] Table 2

[0034] The microscopic force information obtained through experimental data analysis is consistent with the conclusions of molecular simulation (Valisko, M.; Kristo f, T.; Gillespie, D.; Boda, D.A. systematic Monte Carlo simulation study of the primitive model planar electrical double layer over an extended range of concentrations, electrode charges, cation diameters and valences. AIP Adv. 2018, 8(2), 025320.).

[0035] The examples show that the test system is stable and reliable, and can measure the dielectric constant of electrolyte solutions accurately and with high precision.

[0036] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A capacitance method dielectric constant test system, characterized by: The system mainly includes a reactor, a constant temperature oil bath, a data collector, a computer, a capacitance tester, a temperature transmitter, a pressure sensor and a capacitance test fixture assembly; the data collector, capacitance tester and computer are all located outside the constant temperature oil bath; the reactor is arranged in the constant temperature oil bath, and a sealing cover is provided on the reactor; the measuring ends of the temperature transmitter and the pressure sensor are both arranged in the reactor, and the signal output ends of the temperature transmitter and the pressure sensor pass through the sealing cover to the outside of the constant temperature oil bath and are connected to the input end of the data collector, and the output end of the data collector is connected to the computer; the measuring end of the capacitance tester is connected to the capacitance test fixture assembly, the capacitance test fixture assembly is located in the reactor, and the output end of the capacitance tester is connected to the computer.

2. The capacitance method dielectric constant test system according to claim 1, characterized in that: During the experiment at room temperature, a magnetic stirrer for the experiment is provided at the bottom of the reactor, and the main body of the magnetic stirrer is wrapped and sealed by a waterproof bag.

3. The capacitance method dielectric constant test system according to claim 1, characterized in that: A complex electrolyte solution is provided in the reactor, and the measuring ends of the temperature transmitter, the pressure sensor and the capacitance tester are all arranged below the liquid level of the complex electrolyte solution.

4. The capacitance method dielectric constant test system according to claim 3, characterized in that: The capacitance test fixture assembly clamps and fixes a parallel plate capacitor.

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