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Molecular events in deliquescence and efflorescence phase transitions of sodium nitrate particles studied by Fourier transform infrared attenuated total reflection spectroscopy
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10.1063/1.2973623
/content/aip/journal/jcp/129/10/10.1063/1.2973623
http://aip.metastore.ingenta.com/content/aip/journal/jcp/129/10/10.1063/1.2973623
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

Schematic diagram of the FTIR-ATR experimental setup.

Image of FIG. 2.
FIG. 2.

Top: FTIR-ATR spectra [(a) and (b)] for the bare ZnSe substrate and the particles on ZnSe substrate in the humidifying process, respectively. Bottom: the area of the O–H stretching band for particles on the ZnSe substrate, together with that for the bare ZnSe substrate as a -axis error (long), as a function of RH. The short -axis error bar derives from the variation between experimental replicates. The -axis error bar arises from the RH measurements.

Image of FIG. 3.
FIG. 3.

FTIR-ATR spectra of aerosol particles at various RHs in the (a) humidifying process and the (b) evaporation processes of cycle 1. By translating them along the -axis, the spectra are displayed at a constant interval to clearly show their evolution.

Image of FIG. 4.
FIG. 4.

FTIR-ATR spectra of aerosol particles at various RHs in the (a) humidifying process and the (b) evaporation processes of cycle 2. By translating them along the -axis, the spectra are displayed at a constant interval to clearly show their evolution.

Image of FIG. 5.
FIG. 5.

Images of particles deposited on a ZnSe substrate at various RH values in the humidifying process at room temperature. The RH is displayed at the bottom left of each image.

Image of FIG. 6.
FIG. 6.

(a) Area ratios of the O–H stretching band of water to the band as a function of RH for particles in the humidifying process of cycle 2, which is shown by the triangle with error bars. The long -axis error bar is determined by the area ratio of the O–H stretching band from the bare ZnSe substrate to the band. The short -axis error bar arises from the variation between experimental replicates. The -axis error bar derives from the RH measurements. The inner FTIR-ATR difference spectra result from the O–H stretching band at various RHs after subtraction of the spectra at 4.1% RH. (b) Several possible schematic models of water molecules adsorbed on different faces of the rhombohedral crystal. The schematic models 1–7, 8 and 9 display the water molecules adsorbed on faces (001), (110), and (111) of the crystal, respectively.

Image of FIG. 7.
FIG. 7.

Area ratios of the O–H stretching band of water to the band as a function of RH for particles in the humidifying and evaporation processes of the two cycles, with a -axis error bar derived from the variation between experimental replicates and an -axis error bar arising from the RH measurements.

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/content/aip/journal/jcp/129/10/10.1063/1.2973623
2008-09-10
2014-04-23
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Molecular events in deliquescence and efflorescence phase transitions of sodium nitrate particles studied by Fourier transform infrared attenuated total reflection spectroscopy
http://aip.metastore.ingenta.com/content/aip/journal/jcp/129/10/10.1063/1.2973623
10.1063/1.2973623
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