Method for measuring liquid phase diffusion coefficient, and apparatus thereof

A liquid phase diffusion coefficient and diffusion coefficient technology, applied in the field of optical measurement, can solve the problem of no new breakthrough in the liquid phase diffusion coefficient, and achieve the effects of strong anti-environmental interference ability, high measurement accuracy and simple equipment

CN102445406BInactive Publication Date: 2013-04-17YUNNAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2013-04-17
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to a method for measuring a liquid phase diffusion coefficient, and an apparatus thereof, and belongs to a method for measuring a diffusion coefficient of a liquid by adopting yellow light LED as a light source based on a capillary imaging method. According to the present invention, a transparent capillary is adopted to construct a liquid phase diffusion cell; the specific refractive index spatial resolution measurement capability of the capillary imaging method is adopted to directly observe and record the diffusion regularity of the thin layers of the diffusion medium in the capability, wherein the thin layers of the diffusion medium have the same refractive index; the liquid phase diffusion coefficient is calculated based on the Fick second law. With the present invention, the diffusion coefficient between glycerol and purified water is measured at a room temperature of 25 DEG C, with comparing the diffusion coefficient 0.720*10<-5> cm<2> / s reported by the literature of the traditional holographic interferometry method with the diffusion coefficient 0.715*10<-5> cm<2> / s measured by the method of the present invention, the relative error is 0.69%; the capillary is adopted to construct the liquid phase diffusion cell, such that the amount of the required sample is less, the measurement speed is rapid, the anti-interference capability is strong and the system stability is good.
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Description

technical field

[0001] The invention belongs to the technical field of optical measurement, and relates to a method for measuring liquid phase diffusion coefficient by using an LED as a light source through the principle of capillary optical imaging. Background technique

[0002] Liquid phase diffusion coefficient is an important basic data for studying mass transfer process, calculating mass transfer rate and chemical design and development. It has been widely used in emerging industries such as biology, chemical industry, medicine and environmental protection. Since the average spacing of liquid molecules is much smaller than that of gas molecules, and they are not as regularly arranged as solids, the theoretical description and experimental measurement of liquid phase diffusion coefficients are far more difficult than those of gases and solids, and the liquid phase diffusion data of different systems are quite scarce. At present, the liquid-phase diffusion coefficient is...

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Embodiment Construction

[0058] (1) Method and device of the present invention

[0059] For the method of the present invention, figure 1 The diffusion process of the first kind of diffusion solution housed in the cylindrical groove 5 in the capillary 6 to the second kind of diffusion solution will be as Figure 4(a) The principle shown is the same, the liquid concentration in the capillary changes gradually, and since the concentration has a linear relationship with the refractive index, the refractive index in the capillary 6 changes gradually. Therefore, after taking a fixed refractive index value between the refractive index of the first diffusion solution and the second diffusion solution, set figure 1 The position of the electronic displacement platform 11 in the center can observe the change of the clear image formed by a certain fixed refractive index thin layer on the computer display screen. As time goes by, the diffusion process continues, and the fixed refractive index thin layer in the...