Surface plasmon resonance imaging-based nano single particle water content measuring device and method

Abstract

The invention relates to a surface plasmon resonance imaging-based nano single particle water content measuring device and a method. The measuring device comprises a stable moisture generating module,a nano particle generation module and a nano aerosol imaging module. The stable moisture generating module comprises an airflow humidifying channel, an airflow drying channel, a three-way electromagnetic valve and a blending chamber. The nano-particle generation module comprises an atomizer, a diffusion drying pipe and an electromobility analyzer. The nano aerosol imaging module comprises a sample pool, a gold film substrate detachably installed below the sample pool and an imaging system arranged below the gold film substrate. The imaging system comprises a laser light source, a filter, a half-wave plate, a scanning galvanometer, a lens, a beam splitter, a telephoto objective lens, a tubular lens, a filter and a CCD camera. The defects in the prior art can be overcome, and the water content of the nano aerosol particles can be accurately tested under the standard atmospheric pressure condition.

Description

technical field [0001] The invention relates to the technical field of environmental monitoring of atmospheric aerosol particles, in particular to a device and method for measuring water content of nanometer single particles based on surface plasmon resonance imaging. Background technique [0002] The hygroscopicity of aerosol particles plays a crucial role in reduced visibility, cloud formation, radiative forcing, and regional and global climate. According to the hygroscopicity of aerosols, aerosols can be divided into hygroscopic aerosols and non-hygroscopic aerosols. The hygroscopic properties of aerosols determine which aerosol particles can act as cloud condensation nuclei (CCNs) to contribute to the indirect effects of aerosols. In addition, the mixing of atmospheric aerosol particles and the resulting heterogeneous reactions will further change the hygroscopic properties of aerosols, affecting the ability to absorb solar radiation and form clouds. The latest researc...

AI Technical Summary

Problems solved by technology

For this kind of deposition technology, the droplets on the substrate are usually non-spherical, so the growth of water droplets after water absorption can be asymmetric and anisotropic, which leads to the inability of two-dimensional imaging to accurately grasp the volume changes of particles, such as light Microscope and Electron Microscopy Imaging Technology

Both light microscopy and electron microscopy imaging will be affected by the light source. The diffraction limit of visible light makes the imaging size of light microscopy cannot be smaller than 200nm. Electron beam imaging is seriously affected by the conductivity of particles. Secondly, volatile soluble salts are difficult to keep stable

AFM three-dimensional imaging technology can only guarantee 180° size imaging, and there is still a significant deviation in the 180° imaging effect of particles with complex sizes or special static angles

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