Vacuum FTIR observation on hygroscopic properties and phase transition of malonic acid aerosols

Xu Shao; Yun Zhang; Shu Feng Pang; Yun Hong Zhang

doi:10.1016/j.chemphys.2016.11.001

Vacuum FTIR observation on hygroscopic properties and phase transition of malonic acid aerosols

Xu Shao, Yun Zhang, Shu Feng Pang^*, Yun Hong Zhang

^*Corresponding author for this work

School of Chemistry and Chemical Engineering

Beijing Institute of Technology

Research output: Contribution to journal › Article › peer-review

16 Citations (Scopus)

Abstract

A novel approach based on a combination of a pulse relative humidity (RH) controlling system and a rapid scan vacuum FTIR spectrometer was utilized to investigate the hygroscopic property and phase transition of malonic acid (MA) aerosols. By using this approach, both water vapor amount around the aerosols and water content within aerosols with sub-second time resolution were obtained. Based on the features of FTIR absorbing bands, it can be known that the evolution of hydrogen-bonding structures of malonic acid aerosols took place from (H₂O)_n-MA to MA-MA accompanying with phase transition in the dehumidifying process. And in present paper, the stepwise efflorescence of MA aerosols and nucleation rates at different RHs are first reported. Our observation has shown that the efflorescence of MA started at ∼17% RH and the nucleation rates increased with decreasing RH.

Original language	English
Pages (from-to)	7
Number of pages	1
Journal	Chemical Physics
Volume	483-484
DOIs	https://doi.org/10.1016/j.chemphys.2016.11.001
Publication status	Published - 1 Feb 2017

Keywords

Efflorescence
Hydrogen-bonds
Malonic acid
Nucleation rates

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10.1016/j.chemphys.2016.11.001

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title = "Vacuum FTIR observation on hygroscopic properties and phase transition of malonic acid aerosols",

abstract = "A novel approach based on a combination of a pulse relative humidity (RH) controlling system and a rapid scan vacuum FTIR spectrometer was utilized to investigate the hygroscopic property and phase transition of malonic acid (MA) aerosols. By using this approach, both water vapor amount around the aerosols and water content within aerosols with sub-second time resolution were obtained. Based on the features of FTIR absorbing bands, it can be known that the evolution of hydrogen-bonding structures of malonic acid aerosols took place from (H2O)n-MA to MA-MA accompanying with phase transition in the dehumidifying process. And in present paper, the stepwise efflorescence of MA aerosols and nucleation rates at different RHs are first reported. Our observation has shown that the efflorescence of MA started at ∼17% RH and the nucleation rates increased with decreasing RH.",

keywords = "Efflorescence, Hydrogen-bonds, Malonic acid, Nucleation rates",

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AU - Shao, Xu

AU - Zhang, Yun

AU - Pang, Shu Feng

AU - Zhang, Yun Hong

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Y1 - 2017/2/1

N2 - A novel approach based on a combination of a pulse relative humidity (RH) controlling system and a rapid scan vacuum FTIR spectrometer was utilized to investigate the hygroscopic property and phase transition of malonic acid (MA) aerosols. By using this approach, both water vapor amount around the aerosols and water content within aerosols with sub-second time resolution were obtained. Based on the features of FTIR absorbing bands, it can be known that the evolution of hydrogen-bonding structures of malonic acid aerosols took place from (H2O)n-MA to MA-MA accompanying with phase transition in the dehumidifying process. And in present paper, the stepwise efflorescence of MA aerosols and nucleation rates at different RHs are first reported. Our observation has shown that the efflorescence of MA started at ∼17% RH and the nucleation rates increased with decreasing RH.

AB - A novel approach based on a combination of a pulse relative humidity (RH) controlling system and a rapid scan vacuum FTIR spectrometer was utilized to investigate the hygroscopic property and phase transition of malonic acid (MA) aerosols. By using this approach, both water vapor amount around the aerosols and water content within aerosols with sub-second time resolution were obtained. Based on the features of FTIR absorbing bands, it can be known that the evolution of hydrogen-bonding structures of malonic acid aerosols took place from (H2O)n-MA to MA-MA accompanying with phase transition in the dehumidifying process. And in present paper, the stepwise efflorescence of MA aerosols and nucleation rates at different RHs are first reported. Our observation has shown that the efflorescence of MA started at ∼17% RH and the nucleation rates increased with decreasing RH.

KW - Efflorescence

KW - Hydrogen-bonds

KW - Malonic acid

KW - Nucleation rates

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JO - Chemical Physics

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Vacuum FTIR observation on hygroscopic properties and phase transition of malonic acid aerosols

Abstract

Keywords

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