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Method for measuring size distribution of grains in Nano level through method of capillary electrophoresis

A capillary electrophoresis, nano-scale technology, applied in the direction of particle and sedimentation analysis, particle size analysis, measuring devices, etc., can solve the problems of difficult quantitative and statistical analysis, high laser source price, high instrument price, etc., to achieve simple structure and easy operation line, low cost effect

Inactive Publication Date: 2006-02-01
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The TEM method is an absolute method for the observation and determination of particle size, which is intuitive, but the particle size varies with different fields of view, so it is not easy to quantify and statistically analyze
The laser particle size analyzer produced by the PCS method can obtain the average particle size and particle size distribution, and is mainly used for the detection of the particle size of industrial products. Popular application in quality control of body manufacturers

Method used

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  • Method for measuring size distribution of grains in Nano level through method of capillary electrophoresis
  • Method for measuring size distribution of grains in Nano level through method of capillary electrophoresis
  • Method for measuring size distribution of grains in Nano level through method of capillary electrophoresis

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0032] The particle size distribution and average particle size of polystyrene (PS) latex particles are measured by the method of the present invention.

[0033] The PS standard sample used in the example is PS20, PS50, PS90 and PS125 (U.S., Duke Scientific Corporation), and average particle size is respectively (21 ± 1.5) nm; (50 ± 2.0) nm; (92 ± 3.7) nm; (125 ±4) nm.

[0034] 1. Establish particle size-adjusted migration time correlation equation

[0035] (1) Measure the particle size distribution of the standard sample with a laser particle size analyzer

[0036] Prepare Na with a concentration of 5mmol / L 2 CO 3 and 1.25mmol / L NaHCO 3 mixed solution as a buffer solution. The buffer solution was used to prepare a suspension of PS50 and PS125 with a concentration of 0.01% by volume. Use an ultrasonic cleaner to ultrasonically disperse for 5 minutes, and then use a laser particle size analyzer to measure the particle size distribution of the dispersed particles. The part...

example 2

[0052] Determination of particle size distribution and average particle size of ultrafine β molecular sieve.

[0053] 1. Establish particle size-adjusted migration time correlation equation

[0054] Prepare the β molecular sieve with buffer solution to a suspension with a concentration of 5 g / L, and ultrasonically disperse it for 5 minutes to prepare a standard sample suspension.

[0055] The standard sample suspension was measured by a laser particle size analyzer, and the particle size distribution results of the standard sample are shown in Table 3.

[0056] The β molecular sieve standard sample suspension was subjected to electrophoresis separation and detection by gravity sampling method. The inner diameter of the capillary used for the separation was 100 μm. Figure 4 .

[0057] The G(d) data corresponding to the different particle sizes in Table 3 and the peak height value of the cumulative distribution of the spectral peak area corresponding to this value in the elec...

example 3

[0069] Prepare the suspension of 7 different β molecular sieve samples by 3 step methods in example 2, then test with capillary electrophoresis (CZE), the average particle diameter (d) of each sample test pcs ) and the results of the laser particle size analyzer (PCS method) are listed in Table 7. Table 7 shows that the result of the method test of the present invention is basically consistent with the PCS method.

[0070] PS50

PS125

Particle diameter,

nm

G(d), %

C(d), %

Particle diameter,

nm

G(d), %

C(d), %

33.9

36.9

39.1

40.9

42.5

44.0

45.4

46.8

48.2

49.6

51.0

52.3

53.8

55.4

57.0

58.2

60.4

62.5

65

26

44

58

70

80

87

93

97

99

100

99

97

93

87

80

70

58

44

26

5

10

15

20

25

30

35

40

45

50

55

60

65

70

7...

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Abstract

A method for determining particle size distribution of nanoparticle by utilizing capillary tube electrophoresis includes preparing nanoparticle sample to be suspension , obtaining capillary tube electrophoretic spectrogram of suspension through separation and detection , substituting regulation moving time of particle with different particle size in spectrogram in correlation equation of particle ¿C regulation moving time for obtaining particle size value , calibrating absorbance obtained from spectrogram with calibration equation of particle content scattering for obtaining content percentage of particle with different particle size .

Description

technical field [0001] The invention is a method for measuring the size distribution of nanoscale particles, specifically, a method for separating particles with different particle sizes by capillary electrophoresis and then measuring the particle size distribution. Background technique [0002] Due to its small particle size, large specific surface area and quantum size effect, nano-powder materials have special properties that conventional coarse-grained materials do not have, and exhibit outstanding performance in light absorption, light filtering, catalysis and other functional properties. Eye-catching application prospects. The particle size and distribution have a great relationship with the overall performance of the material. Taking nanocatalyst as an example, the particle size and particle size distribution of nanocatalyst directly affect its catalytic performance. If the particle size distribution is very wide, or even only a small part of the particle size is at ...

Claims

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Application Information

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IPC IPC(8): G01N15/02G01N21/33
Inventor 薛艳杨海鹰杨永坛
Owner CHINA PETROLEUM & CHEM CORP
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