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A method for measuring the specific surface area of ​​nano-micro charged particles

A specific surface area, micro-band technology, applied in permeability/surface area analysis, measurement device, suspension and porous material analysis, etc., can solve the problems of long operation time, large difference and large error

Active Publication Date: 2017-03-15
重庆为讯科学仪器有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The BET multi-molecular adsorption theory is by far the largest, most influential, and most widely used adsorption theory, but it is unsuccessful in quantification, and the operation time is too long and the error is large
Therefore, the same substance adopts these different determination methods, and the results are often very different.
Moreover, the determination of the specific surface area can only be carried out in the solid phase at present, but most of the processes occur in the liquid phase, and it is not appropriate to apply the results of the solid phase to the liquid phase.

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  • A method for measuring the specific surface area of ​​nano-micro charged particles
  • A method for measuring the specific surface area of ​​nano-micro charged particles
  • A method for measuring the specific surface area of ​​nano-micro charged particles

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Embodiment 1

[0063] A method for measuring the specific surface area of ​​nanometer-micrometer charged particles, specifically comprising the following steps:

[0064] (1) Select two indicator ions Na + , Ca 2+ , the corresponding anion Cl - , whose chemical formula is NaCl and CaCl 2 ;

[0065] (2) Determination of the total surface charge of nano-micro particles, denoted as N ∞ ,Specific steps are as follows:

[0066] 1) Weigh the nano-micron charged particle sample to be tested in the Erlenmeyer flask, mix the sample to be tested with 0.1mol / LMgCl 2 The mass ratio of the solution is 1:10, add 0.1mol / L MgCl to the sample to be tested 2 solution, sealed, placed in a shaking box to vibrate for 5 hours, centrifuged, and removed the supernatant;

[0067] 2) Add 0.1mol / L MgCl equal to the volume of step 2) to the centrifuge tube 2 Solution, disperse the precipitate with a glass rod, continue to shake for 5 hours, centrifuge, remove the supernatant, repeat this step 4 times;

[0068] ...

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Abstract

The invention provides a method for measuring the specific surface area of nano-micron charged particles. According to the invention, measurement of the specific surface area under a liquid-phase condition is realized for the first time; and, when ion exchange on the surfaces of the particles is balanced, the specific surface area of the particles can be directly calculated only in need of measuring the concentration of ion in a balanced solution. The method disclosed by the invention is simple to operate and accurate in measurement result; and the disadvantages of being long in operation time, large in error and the like in the existing specific surface area measurement technology are overcome.

Description

technical field [0001] The invention relates to the field of performance measurement of nanometer-micrometer particles, in particular to a method for measuring the specific surface area of ​​nanometer-micrometer charged particles. Background technique [0002] The specific surface area is a crucial surface property parameter of nano-micro particles, and its size is closely related to the particle size, shape, surface defects and pore structure. The size of the specific surface area will have a great impact on many other physical and chemical properties of the material, especially for nano-micron particles, the specific surface area becomes an important parameter to measure the properties of the material. In many industrial applications, such as graphite, battery, rare earth, ceramics, alumina, chemical industry and high-efficiency powder materials research and development, production, analysis, monitoring, etc., the specific surface area must be detected. Therefore, in orde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N15/08
Inventor 刘新敏李航李睿田锐
Owner 重庆为讯科学仪器有限责任公司