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Testing method of specific surface area of particulate matter in suspension system

A specific surface area and testing method technology, applied in the direction of nuclear magnetic resonance analysis, etc., can solve the problem of not being able to provide interface characteristic information effectively, and achieve the effect of stable measurement results, good repeatability, and simple testing process

Active Publication Date: 2016-08-17
SHANGHAI NIUMAI ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Measurement methods such as gas adsorption method are suitable for those dry powder samples, but cannot effectively provide information on the interface characteristics of these samples in the suspension state

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Detection of SiO 2 Specific surface area of ​​particles in water, SiO 2 The particle size of the particles is 162.7nm, the particle weight density, that is, the solid content of the suspension, is 0.255, the solvent density is 1g / ml, and the particle density is 1.176g / ml.

[0025] (1) Carry out nuclear magnetic resonance detection on the solvent water, use a metal bath to keep the water temperature at 20-80°C, conduct a CPMG pulse sequence test on the solvent water, and measure the T of the solvent water 2 The relaxation time is 2681ms,

[0026] (2) SiO 2 The particles were placed in solvent water to obtain SiO-containing 2 suspension of particles;

[0027] (3) For those containing SiO 2 The particle suspension is tested by nuclear magnetic resonance, and the temperature of the suspension is kept at 20-80°C with a metal bath, and the suspension is tested by CPMG pulse sequence, and the T of the particle sample is measured. 2 The relaxation time is 135.232ms,

[0...

Embodiment 2

[0037] detect WO 3 Specific surface area of ​​particles in ethyl ester, WO 3 The particle size of the particles is 59nm, the particle weight density, that is, the solid content of the suspension, is 0.3, the solvent density is 0.901 g / ml, and the particle density is 1.3 g / ml.

[0038] (1) Carry out nuclear magnetic resonance detection to the solvent ethyl ester, keep the temperature of the solvent at 20-80°C with a metal bath, carry out the CPMG pulse sequence test on the solvent, and measure the T of the solvent 2 The relaxation time is 2482.817ms

[0039] (2) will WO 3 Particles were placed in solvent ethyl ester to obtain WO containing 3 suspension of particles;

[0040] (3) for containing WO 3 The particle suspension is tested by nuclear magnetic resonance, and the temperature of the suspension is kept at 20-80°C with a metal bath, and the suspension is tested by CPMG pulse sequence, and the T of the particle sample is measured. 2 The relaxation time is 88.611ms

[...

Embodiment 3

[0050] Detection of Fe 2 o 3 Specific surface area of ​​particles in toluene, Fe 2 o 3 The particle size of the particles is 59nm, the particle weight density, that is, the solid content of the suspension, is 0.3, the solvent density is 0.87g / ml, and the particle density is 5.24g / ml.

[0051](1) Carry out nuclear magnetic resonance detection to the solvent toluene, keep the solvent temperature at 20-80°C with a metal bath, carry out CPMG pulse sequence test on the solvent, and measure the T of the solvent 2 The relaxation time is 2704ms;

[0052] (2) Fe 2 o 3 The particles were placed in the solvent toluene to obtain Fe-containing 2 o 3 suspension of particles;

[0053] (3) For those containing Fe 2 o 3 The particle suspension is tested by nuclear magnetic resonance, and the temperature of the suspension is kept at 20-80°C with a metal bath, and the suspension is tested by CPMG pulse sequence, and the T of the particle sample is measured. 2 The relaxation time is 4....

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Abstract

The invention discloses a testing method of the specific surface area of a particulate matter in a suspension system. The testing method comprises the following steps: (1) carrying out nuclear magnetic resonance detection on a solvent, controlling the temperature of the solvent by virtue of a metal bath, carrying out CPMG impulse sequence testing on the solvent to obtain T2 relaxation time of the solvent, and calculating relaxation rate R2f of the solvent; (2) adding a particulate matter sample into the solvent, so as to obtain suspension liquid containing the particulate matter sample; (3) carrying out the nuclear magnetic resonance detection on the suspension liquid containing the particulate matter sample, controlling the temperature of the suspension liquid by virtue of the metal bath, carrying out the CPMG impulse sequence testing on the suspension liquid to obtain T2 relaxation time of the particulate matter sample, and calculating the average relaxation rate according to a formula: R2=PbR2b+PfR2f; and (4) calculating the specific surface area of the particulate matter according to the following formula: Sa=(R2sp*R2f) / (Psi*Kp). According to the testing method, the specific surface area of the particulate matter in a suspension state can be tested.

Description

technical field [0001] The invention relates to a method for testing the specific surface area of ​​particles in a suspension system. Background technique [0002] As we all know, the surface chemistry, affinity, wettability and wet specific surface area between the particles of the suspended liquid and the solvent are of great technical importance in many industrial and scientific fields: pharmaceutical field (drug dissolution rate and toxicological properties It is directly related to the surface area of ​​the drug); electronic materials (the properties of the grinding liquid such as dispersibility and stability); coatings (the formulation design needs to consider the dispersant and flow characteristics); the energy field (the chemical and physical state of the particle surface, carbon nanotubes Dispersion with slurry); biological field (change in specific surface area after coupling of biomaterials), etc. [0003] Particle interface properties will affect many properties...

Claims

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Application Information

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IPC IPC(8): G01N24/08
CPCG01N24/08
Inventor 杨培强高杨文杨翼后慧云陈琳
Owner SHANGHAI NIUMAI ELECTRONICS TECH
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