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Device and method for measuring surface/interfacial tension of liquid based on droplet volume

A technology of interfacial tension and droplet volume, applied in surface tension analysis and other directions, can solve the problems of slow measurement speed, error, troublesome work, etc., and achieve the effect of strong anti-interference ability, high measurement accuracy and simple structure

Active Publication Date: 2017-10-24
NINGBO NB SCI INSTR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, there are many devices and methods for liquid surface / interface measurement methods, but all of them are still completed by manual operation in the laboratory. There are still many deficiencies in the realization of product quality control in the industrial production process.
For example, CN201210566160.3 proposes a liquid surface tension measurement method based on the axisymmetric droplet profile curve and volume. Although the method adopts the shooting droplet image, it still selects a measurement point artificially. Determining the relevant geometric parameters is not only cumbersome, but the measurement speed is slow. More importantly, due to the artificial selection of measurement points and the artificial determination of the geometric parameters of the measurement points, it will inevitably lead to human error, and the error of the measurement results is more than 5%. This method It is impossible to provide control parameters for product quality in the industrial production process, and it is impossible to implement dynamic monitoring of liquid surface / interfacial tension

Method used

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  • Device and method for measuring surface/interfacial tension of liquid based on droplet volume
  • Device and method for measuring surface/interfacial tension of liquid based on droplet volume
  • Device and method for measuring surface/interfacial tension of liquid based on droplet volume

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Embodiment 1

[0033] Embodiment one, the measurement of water / air surface tension

[0034] Such as figure 1 As shown, the device for measuring the surface / interfacial tension of a liquid based on the droplet volume provided by the embodiment of the present invention includes a first liquid addition unit 9 connected to the liquid outlet of the first liquid addition unit 9 via a first pipeline 10 Capillary 1, background light source 4 and camera unit 6, and computer unit 13 for controlling the work of camera unit 6 and first liquid addition unit 9, wherein the port of said capillary 1 is immersed in the gas phase or with the liquid incompatible In the liquid phase, the luminous point of the background light source 4 and the port of the capillary 1 are on the horizontal optical axis of the lens 5 of the imaging unit 6 . Among them, the first liquid adding unit 9 is driven by a motor and equipped with a precision metering syringe 3 (0.1-10.0ml), its operation and operation speed can be control...

Embodiment 2

[0047] Embodiment two, the measurement of water / oil interfacial tension

[0048] This embodiment adopts the same measuring device as that in Embodiment 1 (see figure 1 ). Start the computer unit 13, and adjust the upper, lower, left, and right positions of the capillary 1 in the real-time image state, so that part of the port (about 0.25-1 mm) is visible above the image and is in the middle of the image, see figure 2 . Adjust the focus of the image and related image parameters to make the image at the port 1 of the capillary clear, with appropriate brightness and contrast. Slowly extrude the liquid (water) in the first liquid adding unit 9 to form a small droplet 2 at the end of the capillary 1 . Below the capillary port is placed a first container 8 containing another (less dense) liquid phase, here vegetable oil (organic phase) as an example. Then, the first container 8 is raised by adjusting the sample platform so that the port of the capillary 1 with the droplet is sl...

Embodiment 3

[0051] Embodiment three, automatic CMC measurement

[0052] see Figure 7 , on the basis of Embodiments 1 and 2, the measurement device provided by this embodiment further includes a second liquid addition unit 16 controlled by a computer unit 13, and its liquid inlet end is connected to a third container 17 via a third pipeline 30 , the liquid outlet is connected to the second container 11 via the fourth pipeline 40; wherein the third container 17 is filled with a solvent of the liquid to be tested or a solution (mother solution) of known concentration, which is controlled by the computer unit 13 The solvent or mother liquor of the liquid to be tested is injected into the second container 11 through the distribution valve of the metering syringe 3 a of the second liquid adding unit 16 . Similarly, the second liquid addition unit 16 is an automatic syringe pump (syringe pump) liquid distribution system driven by a motor and equipped with a precision metering syringe 3a and a ...

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Abstract

The invention discloses a device for measuring liquid surface / interfacial tension based on liquid drop volumes and a method for measuring liquid surface / interfacial tension. A computer unit is used for controlling the work of a metering injector of a liquid adding unit, and the image detection region of the falling of liquid drops is set, so that the liquid drops are formed at a capillary tube joint until the liquid drops fall off; a camera unit is used for continuously shooting images of the liquid drops, the computer unit is used for determining the time points of the falling of the liquid drops from the continuously shot images, and meanwhile, the volume of the liquid drop which drops off at present and a correction factor are calculated according to the difference value of the volume recorded by the metering injector and the volume of the metering injector at the moment when the former liquid drop falls off; the surface / interfacial tension of liquid to be measured can be calculated according to the correction factor, the volumes of the falling liquid drops and input related parameters. The measuring device has a simple structure, the measuring method is simple and convenient, the anti-interference capability is strong, the measuring precision is high, the critical micelle concentration of a surface active agent of a solution and the surface activity of the sample solution can be dynamically monitored, and the degree of automation of the measurement process of the surface / interfacial tension can be realized.

Description

technical field [0001] The invention relates to the field of measurement of liquid surface tension or interfacial tension, in particular to a measuring device and method for determining liquid / gas-surface tension or liquid / liquid-interfacial tension by measuring the volume of a drop when it falls off. Background technique [0002] The surface tension of liquid in gas phase or vacuum and the interfacial tension between two immiscible solution phases are due to the static mutual attraction between liquid molecules. It is not only a basic physical parameter, but also in many industrial production processes and products. Quality inspection plays a key role, such as the production of surfactants, ink manufacturing for inkjet printers, and the control of surface tension is critical to product quality. [0003] At present, there are many devices and methods for liquid surface / interface measurement methods, but all of them are still completed by manual operation in the laboratory. T...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N13/02
Inventor 宋碧海宋少佩
Owner NINGBO NB SCI INSTR CO LTD