CN215574816U

CN215574816U - Capillary sample cell for measuring Zeta potential by electrophoretic light scattering method

Info

Publication number: CN215574816U
Application number: CN202121296067.6U
Authority: CN
Inventors: 秦福元; 秦和义; 刘伟; 申晋
Original assignee: Aopute Technology Shanghai Co ltd
Current assignee: Aopute Technology Shanghai Co ltd
Priority date: 2021-06-10
Filing date: 2021-06-10
Publication date: 2022-01-18
Anticipated expiration: 2031-06-10

Abstract

A capillary sample cell for measuring Zeta potential by an electrophoretic light scattering method belongs to the technical field of Zeta potential measurement. Comprises a sample channel for accommodating a tested sample, and is characterized in that: the sample channel is provided with a front shell (4) and a rear shell (1), the front shell (4) and the rear shell (1) are attached to form the sample channel, electrode plates (3) are arranged on two sides of the sample channel, and the bottom of the sample channel is a horizontal measuring area (5). In the capillary sample cell for measuring the Zeta potential by the electrophoresis light scattering method, the bottom of the sample channel is a horizontal measuring area, so that the electric field intensity in the measuring area is more uniform in the test process, and the accuracy of the Zeta potential measuring result is improved. The sealing bulge and the sealing groove are respectively arranged on the rear shell and the front shell, so that the sealing of the sample channel is ensured.

Description

Capillary sample cell for measuring Zeta potential by electrophoretic light scattering method

Technical Field

A capillary sample cell for measuring Zeta potential by an electrophoretic light scattering method belongs to the technical field of Zeta potential measurement.

Background

The Zeta potential is a parameter for representing the repulsive force between colloidal particles, and the larger the Zeta potential is, the larger the repulsive force between particles is, the more stable the colloidal system is, so that the Zeta potential has important significance in measuring the Zeta potential in the fields of medicine and industrial latex surface reforming control, surfactant function analysis, pulp additive performance research and the like. The electrophoretic light scattering method has become a main method for measuring the Zeta potential due to the advantages of high measuring speed, no pollution to a measured sample and the like.

In the process of measuring the Zeta potential by the electrophoretic light scattering method, the magnitude and uniformity of the electric field intensity of the detection area of the capillary sample cell have great influence on the measurement result of the Zeta potential. However, when the capillary sample cell in the prior art is used for measuring the Zeta potential of the nanoparticles, the electric field intensity is not uniform enough, so that the error of the Zeta potential measurement result is large.

Disclosure of Invention

The technical problem to be solved by the utility model is as follows: the capillary sample cell overcomes the defects of the prior art, provides a horizontal measuring area at the bottom of a sample channel, and therefore in the testing process, the electric field intensity in the measuring area is more uniform, and the accuracy of the Zeta potential measuring result is improved.

The technical scheme adopted by the utility model for solving the technical problems is as follows: the capillary sample cell for measuring Zeta potential by the electrophoretic light scattering method comprises a sample channel for accommodating a sample to be measured, and is characterized in that: the device is provided with a front shell and a rear shell, wherein the front shell and the rear shell are attached to form the sample channel, electrode plates are arranged on two sides of the sample channel, and the bottom of the sample channel is a horizontal measuring area.

Preferably, a groove is formed in the rear end face of the front shell, and the rear shell is attached to the rear end face of the groove to form the sample channel.

Preferably, the electrode plate penetrates through the shell wall of the front shell from outside to inside from two sides and then enters the sample channel.

Preferably, the sample channel is U-shaped, the measuring region is located at the bottom of the U-shaped structure, and the electrode plate extends upwards in the U-shaped sample channel.

Preferably, two injection ports are arranged at the top of the front shell, and the two injection ports are respectively communicated with two ends of the U-shaped sample channel.

Preferably, the outer ring of the groove profile is provided with a sealing groove.

Preferably, the sealing groove is internally provided with front and rear sealing bulges, and the sealing bulges are arranged on the front end surface of the rear shell.

Compared with the prior art, the utility model has the beneficial effects that:

in the capillary sample cell for measuring the Zeta potential by the electrophoresis light scattering method, the bottom of the sample channel is a horizontal measuring area, so that the electric field intensity in the measuring area is more uniform in the test process, and the accuracy of the Zeta potential measuring result is improved.

The sealing bulge and the sealing groove are respectively arranged on the rear shell and the front shell, so that the sealing of the sample channel is ensured.

Drawings

FIG. 1 is a schematic diagram of a capillary sample cell for measuring Zeta potential by electrophoretic light scattering method.

FIG. 2 is a front view of a capillary sample cell for measuring Zeta potential by electrophoretic light scattering method.

Fig. 3 is a sectional view taken along line a-a in fig. 2.

Fig. 4 is a schematic diagram of the structure of a front shell for measuring Zeta potential by an electrophoretic light scattering method.

Fig. 5 is a schematic diagram of the structure of the back shell for measuring Zeta potential by electrophoretic light scattering method.

Wherein: 1. rear shell 2, filling opening 3, electrode slice 4, front shell 5, measuring area 6, recess 7, seal groove 8, sealed arch.

Detailed Description

Fig. 1 to 5 are preferred embodiments of the present invention, and the present invention will be further described with reference to fig. 1 to 5.

As shown in fig. 1, a capillary sample cell (hereinafter referred to as sample cell) for measuring Zeta potential by an electrophoretic light scattering method includes a front case 4 and a rear case 1, wherein the front case 4 and the rear case 1 are attached to each other in a strip shape. After the front shell 4 and the rear shell 1 are attached front and back, a sample channel is formed at the joint between the front shell 4 and the rear shell 1.

And 2-3, in the sample cell, the sample channel is of a U-shaped structure, the bottom of the U-shaped sample channel is a horizontal measuring area 5, and two ends of the sample channel extend upwards to the top of the sample cell. Two injection ports 2 are arranged on the top of the front shell 4, and the two injection ports 2 are respectively communicated with two ends of the sample channel.

Two electrode plates 3 are respectively arranged on two sides of the front shell 4, and the electrode plates 3 penetrate through the shell wall of the front shell 4 from outside to inside from two sides of the front shell 4 and then enter the sample channel, and vertically extend upwards in the sample channel.

As shown in fig. 4, a U-shaped groove 6 is formed in the front housing 4, and after the rear housing 1 is attached to the front housing 4, the U-shaped groove 6 is engaged with the front housing to form the sample channel, and the two injection ports 2 are respectively communicated with two sides of the top of the groove 6. The electrode plates 3 enter the rear access grooves 6 from the two sides of the front shell 4 and respectively extend upwards to the upper parts of the grooves 6. And a sealing groove 7 is also formed in the outer ring of the profile of the groove 6.

As shown in fig. 5, a sealing protrusion 8 is disposed on a joint surface of the rear case 1 and the front case 4, a contour of the sealing protrusion 8 matches with the sealing groove 7, and when the rear case 1 and the front case 4 are joined in a front-back direction, the sealing protrusion 8 is embedded in the sealing groove 7 to plug a rear end surface of the groove 6, and a periphery and a rear end of the groove 6 are sealed to form a sample channel. By providing the sealing protrusion 8 and the sealing groove 7 on the rear case 1 and the front case 4, respectively, the sealing of the sample channel is ensured.

The specific working process and working principle are as follows:

the sample to be measured is injected into the sample channel of the sample cell from the injection port 2 by using a syringe, and the sample channel is filled with the sample. The electrode plates 3 on the two sides are soaked in the sample channel by the tested sample and fully contacted with the tested sample. Outside the sample cell, a constant voltage is applied to the electrode sheet 3, and a constant electric field is established in the measurement region 5. The charged particles make directional electrophoretic motion in the constant electric field of the measuring region 5, and the electrophoretic mobility of the charged particles is further measured by an electrophoretic light scattering method, so that the Zeta potential of the particles is calculated. Because the measuring area 5 is of a horizontal structure, the electric field intensity of the measuring area in the sample cell is more uniform, and the accuracy of a Zeta potential measuring result is improved.

The foregoing is directed to preferred embodiments of the present invention, other and further embodiments of the utility model may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow. However, any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present invention are within the protection scope of the technical solution of the present invention.

Claims

1. A capillary sample cell for measuring Zeta potential by electrophoretic light scattering method, comprising a sample channel for accommodating a sample to be measured, characterized in that: the sample channel is provided with a front shell (4) and a rear shell (1), the front shell (4) and the rear shell (1) are attached to form the sample channel, electrode plates (3) are arranged on two sides of the sample channel, and the bottom of the sample channel is a horizontal measuring area (5).

2. The capillary sample cell for measuring Zeta potential according to claim 1, characterized by the following: a groove (6) is formed in the rear end face of the front shell (4), and the rear shell (1) is attached to the rear end face of the groove (6) to form the sample channel.

3. The capillary sample cell for measuring Zeta potential according to claim 1, characterized by the following: the electrode slice (3) penetrates through the shell wall of the front shell (4) from outside to inside from two sides and then enters the sample channel.

4. The capillary sample cell for measuring Zeta potential by the electrophoretic light scattering method according to any one of claims 1 to 3, wherein: the sample channel is U-shaped, the measuring area (5) is positioned at the bottom of the U-shaped structure, and the electrode plate (3) extends upwards in the U-shaped sample channel.

5. The capillary sample cell for measuring Zeta potential according to claim 4, wherein: two injection ports (2) are arranged at the top of the front shell (4), and the two injection ports (2) are respectively communicated with two ends of the U-shaped sample channel.

6. The capillary sample cell for measuring Zeta potential according to claim 2, characterized by the following: and a sealing groove (7) is formed in the outer ring of the profile of the groove (6).

7. The capillary sample cell for measuring Zeta potential according to claim 6, wherein: the sealing groove (7) is internally provided with a front sealing bulge (8) and a rear sealing bulge (8), and the sealing bulges (8) are arranged on the front end surface of the rear shell (1).