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Method for detecting physical characteristics of nano-scale soot microparticles and application of method

A detection method and a technology of physical characteristics, which are applied in the field of detection of the physical characteristics of nano-scale soot particles, can solve the problems of complex formation process of soot particles and unclear formation and evolution mechanism, so as to ensure authenticity and consistency , the effect of small damage

Active Publication Date: 2017-03-22
TIANJIN UNIV
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  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although relevant research institutions at home and abroad have done a lot of work on the formation mechanism of soot particles and made great progress, the formation process of soot particles is very complicated, so the formation and evolution mechanism of soot particles has not yet been fully understood.

Method used

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  • Method for detecting physical characteristics of nano-scale soot microparticles and application of method
  • Method for detecting physical characteristics of nano-scale soot microparticles and application of method
  • Method for detecting physical characteristics of nano-scale soot microparticles and application of method

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Embodiment 1

[0048] A detection method for the physical properties of nano-scale soot particles, using an atomic force microscope and a Raman spectrometer to simultaneously detect the three-dimensional morphology, mechanical properties and graphitization degree of nano-scale soot particles at the same position, including the following step:

[0049] First, select a diesel engine with model number 6102BZLQ, speed of 1000rpm, fuel injection pressure of 100MPa, and fuel of National V diesel oil, and then set the crankshaft angle of the diesel engine to -0.5°, 2.5°, 7°, 18°, 24.5° respectively The soot particles in the cylinder are collected on the mica sheet, and the collected mica sheet is marked and placed in a petri dish, waiting for analysis;

[0050] Secondly, power on the laser, monitor, white light source, computer, display and controller of the combined system of atomic force microscope and Raman spectrometer;

[0051] Obtain the three-dimensional morphology and Raman spectrum of nano-...

Embodiment 2

[0076] The process of Example 1 is basically the same, except that the collection of soot particle samples is different: the fuel in the laboratory diffusion flame burner is selected as methane, and the flame height is respectively 30mm, 34mm, 38mm, 50mm, and 60mm. The particles were collected on the mica sheet, and the collected mica sheet was marked and placed in a petri dish; the mica sheets with soot particles obtained at the diffusion flame heights of 30mm, 34mm, 38mm, 50mm, and 60mm were fixed on the atomic force microscope and On the sample platform of the Raman spectrometer coupled system, follow the method of Example 1 to operate until the detection of all nano-scale soot particle samples is completed. The three-dimensional morphology, degree of graphitization and mechanical properties of the soot particles at different flame heights of the laboratory diffusion flame were obtained. The three-dimensional morphology, degree of graphitization and mechanical properties of...

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Abstract

The invention discloses a method for detecting physical characteristics of nano-scale soot microparticles. The method is used for simultaneously detecting the three-dimensional morphology, mechanical characteristics and degree of graphitization of the same position of each nano-scale soot microparticle by using an atomic force microscope and Raman spectrometer combination system and comprises the following steps: acquiring the three-dimensional morphology, force curve and Raman spectrogram of a nano-scale soot microparticle sample, and carrying out peak-differentiating-imitating on the Raman spectrogram by using software origin so as to evaluate the degree of graphitization of the nano-scale soot microparticle sample; finally obtaining the mechanical characteristics of the nano-scale soot microparticle sample, wherein the mechanical characteristics comprise an adsorption force, a van der Waals force and an adhesion force. According to the method and the application thereof, the rule of evolution of the three-dimensional morphology, mechanical characteristics and degree of graphitization of soot microparticles generated from different source combustion processes can be researched, and research results contribute to the deep understanding of generation and evolution mechanisms of the soot microparticles, so that a theoretical instruction is provided for the reduction of emission of the soot microparticles and the control on atmospheric environment pollution.

Description

technical field [0001] The invention relates to a method for detecting soot particles, in particular to a method for detecting the physical characteristics of nano-scale soot particles. Background technique [0002] The impact of soot particles emitted by combustion on the environment and human health has attracted more and more attention. Countries around the world have also formulated relevant policies on the emission of soot particles. It is of great significance to deeply understand the formation and evolution mechanism of soot particles in the combustion process. To control the emission of pollutants, the corresponding control strategy is put forward in principle, in order to achieve low carbon smoke particle emissions. Although relevant research institutions at home and abroad have done a lot of work on the formation mechanism of soot particles and made great progress, the formation process of soot particles is very complicated, so the formation and evolution mechanis...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N15/00
CPCG01N15/00G01N2015/0038
Inventor 宋崇林刘野李娜吕刚
Owner TIANJIN UNIV
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