Mr. ChenGuang Yan Profile

ChenGuang Yan

at Nanjing Univ of Science and Technology

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Proceedings Article | 31 January 2020 Paper

Study on the application of high porosity materials in infrared smoke composition based on freeze-drying

Siyan Chen, Chenguang Zhu, Yikai Wang, Chenguang Yan

Proceedings Volume 11427, 114271R (2020) https://doi.org/10.1117/12.2551858

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SiO₂ aerogel has the characteristics of high porosity and high specific surface area. In order to explore the feasibility of using it as a new infrared functional additive for smoke composition, SiO₂ aerogel was mixed with NaNO₃ and NH₄NO₃ saturated solution respectively, and freeze-drying was introduced to make NaNO₃ and NH₄NO₃ deposit in the pores or surface of SiO₂ aerogel. So the powder-form infrared functional additive was prepared completely. The new powder not only reduces the frequency of the phenomenon of harden synthesized compound and improves its preparation process, but also guarantees the recovery of prefabricated particle size of SiO₂ aerogel in the combustion process. The experimental results show that: when mixed with smoke composition, on the condition that the mixing ratio of additives is 20% and negative oxygen balance is 20, compared with the traditional smoke composition obscuring ratio, the smoke composition synthesized obscuring ratio can be increased by 72% and 47% in infrared band.

Proceedings Article | 10 May 2019 Paper

Study on multiphase diffusion reaction for interface of magnesium particle in microscale

Xiao Xie, ChenGuang Zhu, JingRan Xu, ChenGuang Yan

Proceedings Volume 11068, 1106802 (2019) https://doi.org/10.1117/12.2522160

KEYWORDS: Particles, Magnesium, Combustion, Oxygen, Scanning electron microscopy, Diffusion, Oxidation, Microscopes, Interfaces

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Combustion mechanism of magnesium has long been explored. It has been recently shown that spherical magnesium particles with highly active can be used to analyze combustion process in detail with the help of new methods and advanced instruments. This work is aimed at investigating the multiple diffusion reaction of single spherical magnesium particles in accordance with surface composition and combustion remains. Energy Dispersive Spectrometer (EDS), Scanning Electron Microscope (SEM) and X-ray Diffraction (XRD) were used to analyze the samples before and after reaction. In addition, combustion of magnesium particle was conducted in a microscope heating system. The results of the study show that an oxygen-rich layer formed on the particle surface before the particle was heated to burn. Dissolved oxygen was detected in this layer and its concentration is lower than that of stoichiometric MgO. The dissolution reaction of oxygen begins before the gas phase combustion and later on, after the gas phase combustion stops, becomes the dominated reaction. It is suggested that there are two sources of MgO formed during the oxidation process, Mg(s) → Mg(g) → MgO(s) and Mg(s) → oxygen-rich layer(s) → MgO(s). The latter is the dominated mechanism of surface heterogeneous reaction.

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