Electrode device for detecting Zeta potential of high-concentration sample through electrophoresis light scattering

Abstract

The utility model provides an electrode device for detecting Zeta potential of a high-concentration sample by electrophoresis light scattering, which comprises a laser, a high-concentration sample electrode and a photoelectric detector, an incident laser beam emitted by the laser is incident in a manner of being vertical to the outer vertical surface of a micro-flow cell, and an optical fiber head of the photoelectric detector is positioned in a direction forming an angle of 12 degrees with the laser beam; the high-concentration sample electrode adopts a flow-through design, and the minimum optical path of a micro flow cell is 1.5 mm; a sample can be added into the micro-flow cell through the silicone tube. According to the utility model, the Zeta potential test requirement of a high-concentration sample can be met, the minimum sample quantity is 57 microliters, the electrode cost is low, the electrode can be replaced, and the Zeta potential titration test can be carried out by being connected with an automatic titrator.

Description

Technical Field

[0001] The utility model relates to the technical field of Zeta potential testing, in particular to an electrode device for detecting the Zeta potential of a high-concentration sample by electrophoresis light scattering. Background Art

[0002] Measuring the Zeta potential of a particle suspension system is of great significance in assessing the stability of the suspension, guiding formulation and process optimization, and studying the interaction between particles and media. The Zeta potential of a particle refers to the electric potential corresponding to the slip layer boundary of charged particles dispersed in a liquid medium. The absolute value of the Zeta potential is related to the stability of the system. The larger the absolute value, the greater the repulsive force between particles, the less likely the particles are to form agglomerates, and the better the stability of the system. Therefore, the Zeta potential is an important indicator of the surface charge properties of particles in a specific environment and has a wide range of applications in chemistry, chemical engineering, medicine, water treatment, new energy, and other fields.

[0003] Electrophoretic light scattering (ELS) is currently the most widely used optical technology for detecting the Zeta potential of samples. In the ELS technology, an electric field is applied to both ends of the particle suspension, and the charged particles undergo electrophoretic motion under the action of the electric field force. When the laser is irradiated on the particles undergoing electrophoretic motion, the frequency of the scattered light will shift due to the laser Doppler effect, and the magnitude of the frequency shift is related to the electrophoretic velocity of the particles. Frequency shift information can be obtained by processing the scattered light signal. The electrophoretic mobility of the particles is calculated by frequency shift calculation, and then the Zeta potential and Zeta potential distribution of the particles are calculated. Since the forward angle scattering signal of the system can obtain higher resolution results, electrophoretic light scattering usually collects scattered light within the forward angle range of 10°-15° for calculation.

[0004] Two types of electrodes are commonly used in ELS technology: an open, plug-in electrode and a capillary electrode. The commonly used plug-in electrode has an optical path of 10 mm and requires a sample volume of 1.0-1.5 mL. The commonly used capillary electrode has an optical path of 4 mm and requires a sample volume of 0.75-1.0 mL. Electrophoretic light scattering forward optical path detection systems are often unable to effectively detect high-concentration and high-turbidity samples because, at the longer optical path, the forward scattered light from high-concentration and high-turbidity samples cannot effectively pass through the sample cell. Furthermore, the commonly used plug-in electrodes and capillaries require a large sample volume, which cannot meet the needs of Zeta potential testing of trace samples. Utility Model Content

[0005] The purpose of this utility model is to provide an electrode device for detecting the Zeta potential of high-concentration samples by electrophoretic light scattering. The specific scheme is as follows:

[0006] An electrode device for detecting the zeta potential of a high-concentration sample by electrophoretic light scattering, comprising a laser, a high-concentration sample electrode, and a photodetector;

[0007] The incident laser beam emitted by the laser is incident perpendicular to the outer surface of the micro flow cell, and the optical fiber head of the photodetector is located at a direction of 12° to the laser beam;

[0008] The extended line of the observation direction of the photoelectric detector intersects with the laser in the center of the micro flow cell;

[0009] High concentration sample electrode includes locking knob, main body, electrode sheet, silicone tube, connecting armature, electrode, electrode sealing ring, stabilizing cell seat, flow cell sealing ring, micro flow cell, stabilizing shell, shield plate, spring pin needle, pin needle pressing block;

[0010] The mounting platform at the top of the main body is provided with a mounting hole and a jack, a main body groove is provided on the side, a mounting positioning reference surface for the pin needle pressure block is provided inside the main body groove, electrode sheet mounting grooves are provided on both sides of the main body, a main body guide lug is provided at the bottom of the main body, and a light-transmitting hole is provided at the bottom of the main body for laser incidence;

[0011] The electrode sheet is made of phosphor bronze with nickel plating on the surface, which has good conductivity;

[0012] The top of the stable shell has a screw hole and a raised plug-in block. During the assembly process, the raised plug-in block is inserted into the main body plug-in hole for positioning. A silicone tube window is provided on the top of the stable shell. A positioning groove is provided at the bottom of the stable shell for installing the stable pool seat and the guide lug of the main body. The locking hand twist is set in the installation hole of the main body and the screw hole of the stable shell. A light-transmitting hole is provided at the bottom of the stable shell for the emission of laser and scattered light.

[0013] The top of the stabilizing pool seat is provided with an electrode mounting hole, the inside of the mounting hole is provided with a sample flow channel, the inner side of the stabilizing pool seat is provided with a groove, the groove is used for positioning the micro flow cell and fixing the flow cell sealing ring; the bottom of the stabilizing pool seat is provided with a stabilizing pool seat guide lug for inserting into the positioning groove;

[0014] The electrode is made of phosphor bronze, with a gold-plated surface, corrosion-resistant, and has a channel inside for sample circulation;

[0015] The top of the electrode is provided with a pipeline protrusion for installing a silicone tube, with a sample tube channel inside, and a sealing ring installation groove at the bottom of the electrode for placing the electrode sealing ring;

[0016] The pin pressing block is used to position and install the spring pin;

[0017] The armature has a through hole inside, and the electrode pipeline protrusion passes through the through hole for assembly;

[0018] The spring pin is made of copper. The pin and the armature are conductive connection devices between the electrode sheet and the electrode, achieving a direct, stable and efficient conductive connection between the two.

[0019] The shielding plate is used to cover the components, effectively protecting and hiding the internal structure, and improving the overall aesthetics and safety;

[0020] The micro flow cell is made of quartz material and adopts the melting process, with good light transmittance and strong pressure resistance;

[0021] The inner and outer walls of the micro flow cell are both square in cross-section and are made of quartz. The side length of the inner wall is 2 mm or 1.5 mm, and the side length of the outer wall is 4 mm and the length is 4 mm.

[0022] This electrode device can meet the Zeta potential test requirements of high-concentration samples, and its micro-flow cell has a minimum optical path of 1.5mm;

[0023] The electrode device can add samples into the micro flow cell through a silicone tube;

[0024] This electrode device can meet low sample volume requirements, with a minimum sample volume of 57 μL;

[0025] The electrode device can meet the demand for low testing costs, and the electrodes are low-cost and replaceable;

[0026] The overall flow path of the high-concentration sample electrode is a flow-through design, and it can also be used in conjunction with an automatic titrator for Zeta potential titration testing.

[0027] Compared with the prior art, the beneficial effects of the present invention are:

[0028] The electrode of the utility model adopts a flow channel design, and the minimum optical path of the micro-flow cell is 1.5mm, which can effectively reduce the optical path and collect the forward angle scattered light information of high-concentration and high-turbidity samples, thereby improving the testing capability for high-concentration and high-turbidity samples; the device requires a small amount of sample, with a minimum of only 57μL sample volume required for testing, meeting the needs of Zeta potential testing of trace samples; the electrode adopts a phosphor bronze gold plating process, which is corrosion-resistant, low-cost and replaceable; the device can also be used in conjunction with an automatic titrator to perform Zeta potential titration tests. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is the front appearance of the electrode at the Zeta potential of a high concentration sample;

[0030] Figure 2 This is the appearance of the back of the electrode at the Zeta potential of a high concentration sample;

[0031] Figure 3 This is a schematic diagram of the optical path of the utility model;

[0032] Figure 4 This is a schematic diagram of the incident laser, the extended line of the observation direction of the photodetector and the optical path of the micro sample cell of the utility model;

[0033] Figure 5 This is the decomposition diagram of the high-concentration sample electrode of the utility model;

[0034] Figure 6 This is a schematic diagram of a 2mm optical path micro flow cell of the present invention;

[0035] Figure 7 This is a schematic diagram of the 1.5mm optical path micro flow cell of the utility model.

[0036] Among them, 1 is the locking thumbtack, 2 is the main body, 3 is the electrode sheet, 4 is the silicone tube, 5 is the armature, 6 is the electrode, 7 is the electrode sealing ring, 8 is the stabilizing pool seat, 9 is the circulation pool sealing ring, 10 is the micro circulation pool, 11 is the stabilizing shell, 12 is the shielding plate, 13 is the spring pin needle, 14 is the pin needle pressure block, 15 is the jack, 16 is the main body groove, 17 is the screw hole, 18 is the raised plug block, 19 is the silicone tube window, 20 is the groove, 21 is the positioning groove, 22 is the stabilizing pool seat guide lug, 23 is the main body guide lug, 24 is the pipeline convex tube, 25 is the mounting hole, 26 is the electrode sheet mounting groove, 27 is the light-transmitting hole, 28 is the electrode mounting hole, 30 is the optical fiber head, and 31 is the laser. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0038] like Figure 1-7 As shown, an electrode device for detecting the Zeta potential of a high-concentration sample by electrophoretic light scattering is characterized by comprising a laser, a high-concentration sample electrode, and a photodetector;

[0039] The incident laser beam 31 emitted by the laser is incident perpendicular to the outer facade of the micro flow cell, and the optical fiber head 30 of the photodetector is located at a direction of 12° to the laser beam;

[0040] The extended line of the observation direction of the photoelectric detector intersects with the laser in the center of the micro flow cell;

[0041] The high-concentration sample electrode comprises a locking knob 1, a main body 2, an electrode sheet 3, a silicone tube 4, a connecting armature 5, an electrode 6, an electrode sealing ring 7, a stabilizing cell seat 8, a flow cell sealing ring 9, a micro flow cell 10, a stabilizing shell 11, a shielding plate 12, a spring pin 13 and a pin pressing block 14;

[0042] The mounting platform at the top of the main body 2 is provided with a mounting hole 25 and a socket 15, a main body groove 16 is provided on the side, and a mounting positioning reference surface for the pin needle pressure block 14 is provided in the main body groove 16. The electrode sheet 3 mounting grooves 26 are provided on both sides of the main body, a main body guide lug 23 is provided at the bottom of the main body, and a light-transmitting hole 27 is provided at the bottom of the main body for laser incidence;

[0043] The electrode sheet 3 is made of phosphor bronze with nickel plating on the surface, which has good conductivity;

[0044] The top of the stabilizing shell 11 has a screw hole 17 and a raised plug block 18. During the assembly process, the raised plug block 18 is inserted into the main body plug hole 15 for positioning. A silicone tube window 19 is provided on the top of the stabilizing shell 11. A positioning groove 21 is provided at the bottom of the stabilizing shell for installing the stabilizing pool seat 8 and the main body guide lug 23. The locking handle 1 is set in the mounting hole 25 of the main body 2 and the screw hole 17 of the stabilizing shell. A light-transmitting hole 27 is provided at the bottom of the stabilizing shell 11 for emitting laser and scattered light.

[0045] The top of the stabilizing pool seat 8 is provided with an electrode mounting hole 28, and a sample flow channel is provided inside the mounting hole. A groove 20 is provided on the inner side of the stabilizing pool seat, and the groove 20 is used to position the micro flow cell 10 and fix the flow cell sealing ring 9; the bottom of the stabilizing pool seat 8 is provided with a stabilizing pool seat guide lug 22 for inserting into the positioning groove 21;

[0046] The electrode 6 is made of phosphor bronze with a gold-plated surface for corrosion resistance, and has a channel inside for sample circulation;

[0047] The top of the electrode 6 is provided with a pipeline protrusion 25 for installing the silicone tube 4, with a sample tube channel inside, and a sealing ring installation groove is provided at the bottom of the electrode for placing the electrode sealing ring 7;

[0048] The pin pressing block 14 is used to position and install the spring pin 13;

[0049] The armature 5 has a through hole inside, and the electrode pipeline convex tube 24 is assembled through the through hole;

[0050] The spring pin 13 is made of copper. The pin 13 and the armature 5 are conductive connection devices between the electrode sheet 3 and the electrode 6, achieving a direct, stable and efficient conductive connection between the two.

[0051] The shielding plate 12 is used to cover the components, effectively protecting and hiding the internal structure, and improving the overall aesthetics and safety;

[0052] The micro flow cell 10 is made of quartz material and adopts a melting process, with good light transmittance and a strong and pressure-resistant cell body;

[0053] The inner and outer walls of the micro flow cell 10 are both square in cross section and made of quartz. The side length of the inner wall is 2 mm or 1.5 mm, and the side length of the outer wall is 4 mm and the length is 4 mm.

[0054] This utility model can meet the Zeta potential test requirements of high-concentration samples, and the minimum optical path of the micro-flow cell is 1.5mm;

[0055] The utility model can add samples into the micro-circulation cell through a silicone tube;

[0056] This utility model can meet the needs of low sample volume, with the minimum sample volume being 57 μL;

[0057] The utility model can meet the demand for low test cost, and the electrode cost is low and can be replaced;

[0058] The overall flow path of the high-concentration sample electrode is a flow-through design, and it can also be used in conjunction with an automatic titrator for Zeta potential titration testing.

Claims

1. An electrode device for detecting the zeta potential of high-concentration samples by electrophoretic light scattering, characterized in that: including a laser, a high-concentration sample electrode, and a photodetector; The incident laser beam emitted by the laser is incident perpendicular to the outer surface of the micro flow cell, and the optical fiber head of the photodetector is located at a direction of 12° to the laser beam; The extended line of the observation direction of the photoelectric detector intersects with the laser in the center of the micro flow cell.

2. The electrode device for detecting the zeta potential of high-concentration samples by electrophoretic light scattering according to claim 1, characterized in that: The high concentration sample electrode includes a locking knob, a main body, an electrode sheet, a silicone tube, an armature, an electrode, an electrode sealing ring, a stabilizing cell seat, a flow cell sealing ring, a micro flow cell, a stabilizing shell, a shield plate, a spring pin needle and a pin needle pressing block; The mounting platform at the top of the main body is provided with a mounting hole and a jack, a main body groove is provided on the side, a mounting positioning reference surface for the pin needle pressure block is provided inside the main body groove, electrode sheet mounting grooves are provided on both sides of the main body, a main body guide lug is provided at the bottom of the main body, and a light-transmitting hole is provided at the bottom of the main body for laser incidence; The electrode sheet is made of phosphor bronze and has a nickel-plated surface; The top of the stable shell has a screw hole and a raised plug-in block. During the assembly process, the raised plug-in block is inserted into the main body plug-in hole for positioning. A silicone tube window is provided on the top of the stable shell. A positioning groove is provided at the bottom of the stable shell for installing the stable pool seat and the guide lug of the main body. The locking hand twist is set in the installation hole of the main body and the screw hole of the stable shell. A light-transmitting hole is provided at the bottom of the stable shell for the emission of laser and scattered light. The top of the stabilizing pool seat is provided with an electrode mounting hole, the inside of the mounting hole is provided with a sample flow channel, the inner side of the stabilizing pool seat is provided with a groove, the groove is used for positioning the micro flow cell and fixing the flow cell sealing ring; the bottom of the stabilizing pool seat is provided with a stabilizing pool seat guide lug for inserting into the positioning groove; The electrode is made of phosphor bronze with a gold-plated surface and has a channel inside for sample circulation; The top of the electrode is provided with a pipeline protrusion for installing a silicone tube, with a sample tube channel inside, and a sealing ring installation groove at the bottom of the electrode for placing the electrode sealing ring; The pin pressing block is used to position and install the spring pin; The armature has a through hole inside, and the electrode pipeline protrusion passes through the through hole for assembly; The spring pin is made of copper. The pin and the armature are conductive connection devices between the electrode sheet and the electrode, achieving a direct, stable and efficient conductive connection between the two. The shielding plate is used to cover the components, effectively protecting and hiding the internal structure, and improving the overall aesthetics and safety.

3. The electrode device for detecting the zeta potential of high-concentration samples by electrophoretic light scattering according to claim 2, characterized in that: The micro flow cell is made of quartz; The inner and outer walls of the micro-circulation cell are both square in cross-section and are made of quartz. The side length of the square of the inner wall section is 2 mm or 1.5 mm, and the side length of the square of the outer wall section is 4 mm and 4 mm long.

4. The electrode device for detecting the zeta potential of high-concentration samples by electrophoretic light scattering according to claim 2, characterized in that: This electrode device can meet the Zeta potential test requirements of high-concentration samples, and the minimum optical path of the micro-flow cell is 1.5mm.

5. The electrode device for detecting the zeta potential of high-concentration samples by electrophoretic light scattering according to claim 2, characterized in that: The electrode device can add samples into the micro flow cell through a silicone tube.

6. The electrode device for detecting the zeta potential of high-concentration samples by electrophoretic light scattering according to claim 2, characterized in that: The electrode device can meet low sample volume requirements, with a minimum sample volume of 57μL.

7. The electrode device for detecting the zeta potential of high-concentration samples by electrophoretic light scattering according to claim 2, characterized in that: The electrodes of the electrode device are replaceable.

8. The electrode device for detecting the zeta potential of high-concentration samples by electrophoretic light scattering according to claim 2, characterized in that: The overall flow path of the high-concentration sample electrode is a flow-through design, which can be used in conjunction with an automatic titrator for Zeta potential titration testing.

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