Preparation method of transmission electron microscope samples of atmospheric particulates

A technology of atmospheric particulate matter and electron microscopy, which is applied in the field of preparation of atmospheric particulate matter samples, can solve problems such as deduction defects, and achieve the effect of solving the problem of particle shedding and high success rate

Inactive Publication Date: 2016-08-17
CHINA UNIV OF MINING & TECH
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Problems solved by technology

Direct microscopic observation can understand the final state of the particles, but there are great defects in the observation of the internal structure of the particles and the inference of the particle formation process

Method used

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  • Preparation method of transmission electron microscope samples of atmospheric particulates
  • Preparation method of transmission electron microscope samples of atmospheric particulates

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Embodiment 1

[0017] Embodiment 1: the present invention is in concrete implementation, and this preparation method is to carry out the observation of internal structure of particle by embedding and slicing the atmospheric particles collected under polluted weather conditions, while fixing the state of particle structure; first under vacuum state Particle infiltration, and then ultrathin sectioning after embedding polymerization, is achieved by the following steps:

[0018] S1. Sampling: Collect samples with an atmospheric / particulate matter sampler. In heavily polluted weather conditions, at a distance of about 25 meters from the ground, use an atmospheric / particulate matter sampler (with organic collection membrane), TSP / PM10 / PM5 / PM2.5 multi-stage particle sampling head (nominal flow rate is 100L / min, The inlet velocity is 0.3m / s) for sampling. The sampling time is 15 minutes.

[0019] S2. Enrichment: Take out the collection membrane in the sampler, immerse the collection membrane with ...

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Abstract

The invention discloses a preparation method of transmission electron microscope samples of atmospheric particulates, and belongs to the preparation method of atmospheric particulate samples. The atmospheric particulates are collected by a sampler, a collecting membrane with sample particles is immersed in an ethanol solution and enriched sample particles are obtained through ultrasound concussion; enriched sample particles are subjected to gradient penetration of a mixture of ethanol and an embedding medium under a certain vacuum degree, and then polymerized for 48 hours at the temperature of 60 DEG C after stood for 8 hours under vacuum, and embedding blocks of the polymerized particulates are subjected to block repairing and slicing, and finally ultrathin section samples of the atmospheric particulates are obtained. The preparation method of the transmission electron microscope samples of the atmospheric particulates disclosed by the invention effectively eliminates residual gases among the particulates in the embedding process, and better fixes structure states of the particulates. The observation of a transmission electron microscope on the section samples of the atmospheric particulates can provide a technical way for a formation mechanism of the internal structures of the atmospheric particulates, and inference research of a formation reaction mechanism of the atmospheric particulates. The method is applicable to atmospheric particulates, coal particulates and the like.

Description

technical field [0001] The invention relates to a method for preparing an atmospheric particulate matter sample, in particular to a preparation method for an atmospheric particulate matter transmission electron microscope sample. Background technique [0002] Atmospheric particulate matter is one of the most important pollutants affecting atmospheric air quality. Its sources are complex and play an important role in radiation attenuation and cloud formation. Its effect mainly depends on the chemical composition of aerosol particles and the particle size of related components. Distribution and internal structure morphology. Atmospheric submicron particles have a great impact on the environment and human health due to their small particle size and the ability to provide carriers for toxic substances. In recent years, with the development and popularization of large-scale high-resolution microscopic analysis instruments, TEM-based single particle analysis technology has played...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N23/22G01N1/28G01N1/36
CPCG01N1/28G01N1/286G01N1/36G01N23/2202G01N2001/2873
Inventor 周蕊何亚群徐剑坤王震威于冰
Owner CHINA UNIV OF MINING & TECH
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