Vacuum FTIR Observation on the Dynamic Hygroscopicity of Aerosols under Pulsed Relative Humidity

Leng, Chunbo; Pang, Shu-Feng; Zhang, Yunhong; Cai, Chenyang; Liu, Yong

doi:10.1021/acs.est.5b01218

Cited by 33 publications

(21 citation statements)

References 73 publications

(138 reference statements)

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“…The experimental apparatus used here was a vacuum FTIR spectrometer coupled with a pulsed RH controlling system, as shown in Figure S1 in the Supporting Information, which has been described in detail in previous works. ,, Thus, a brief is presented here.…”

Section: Methodsmentioning

confidence: 99%

Hygroscopic Growth and Phase Transitions of Na₂CO₃ and Mixed Na₂CO₃/Li₂CO₃ Particles: Influence of Li₂CO₃ on Phase Transitions of Na₂CO₃ and Formation of LiNaCO₃

Yang

Pang

et al. 2020

J. Phys. Chem. A

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The hygroscopic behaviors and phase changes of inorganic aerosols have been widely explored, but little is known on the hygroscopicity of soluble carbonates. The hydrated states of solid Na 2 CO 3 particles in an air environment remain largely unclear. In this work, the hygroscopic growth, hydrated form transformations, and influence of internal Li 2 CO 3 on phase transitions of Na 2 CO 3 particles are investigated in linear and pulsed relative humidity (RH) changing modes by the vacuum Fourier transform infrared (FTIR) technique. For pure Na 2 CO 3 , aqueous droplets effloresced to a mixture of anhydrous Na 2 CO 3 and Na 2 CO 3 •H 2 O with the initial efflorescence relative humidity (ERH) of 50.8%, probably concerning the formation of Na 2 CO 3 •10H 2 O in the conversion from aqueous to anhydrous Na 2 CO 3 . A reverse process is presented during the three-stage deliquescence transition beginning at ∼60.1% RH; i.e., anhydrous Na 2 CO 3 transforms into aqueous Na 2 CO 3 and Na 2 CO 3 •10H 2 O in stage I, Na 2 CO 3 •10H 2 O dissolves to aqueous Na 2 CO 3 in stage II, and Na 2 CO 3 •H 2 O dissolves into aqueous Na 2 CO 3 in stage III. For internally mixed Na 2 CO 3 /Li 2 CO 3 particles, a double salt, LiNaCO 3 , is found in mixed crystalline phases for the first time, leading to the eutonic composition with Na 2 CO 3 . The experimental observations point to the excess of LiNaCO 3 and complete consumption of Na 2 CO 3 in eutonic composition formation, which results in the absence of Na 2 CO 3 hydrates during phase transitions. The results provide key data for model simulations of hygroscopic properties and phase transitions of Na 2 CO 3 as well as mixed soluble carbonates.

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Section: Methodsmentioning

confidence: 99%

Hygroscopic Growth and Phase Transitions of Na₂CO₃ and Mixed Na₂CO₃/Li₂CO₃ Particles: Influence of Li₂CO₃ on Phase Transitions of Na₂CO₃ and Formation of LiNaCO₃

Yang

Pang

et al. 2020

J. Phys. Chem. A

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“…Meanwhile, the water uptake occurred predominantly before the decrease in SO 2− 4 in the solid AS nanoparticles during the AS deliquescence transition. We speculate that the surface-limited process may control the transport of liquid water to the AS nanoparticles or, in other words, the surface-limited process determines the hygroscopic behavior of AS nanoparticles (Leng et al, 2015).…”

Section: Phase Transition Dynamics Of Pure As Nanoparticlesmentioning

confidence: 99%

Technical note: Real-time diagnosis of the hygroscopic growth micro-dynamics of nanoparticles with Fourier transform infrared spectroscopy

et al. 2022

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Abstract. Nanoparticles can absorb water to grow, and this process will affect the light-scattering behavior, cloud condensation nuclei properties, lifetime, and chemical reactivity of these particles. Current techniques for calculation of aerosol liquid water content (ALWC) usually restrict the size of particles to be within a certain range, which may result in a large uncertainty when the particle size is beyond the specified range. Furthermore, current techniques are difficult to use to identify the intermolecular interactions of phase transition micro-dynamics during particles' hygroscopic growth process because their limited temporal resolutions are unable to capture complex intermediate states. In this study, the hygroscopic growth properties of nanoparticles with electrical mobility diameters (Dem) of ∼ 100 nm and their phase transition micro-dynamics at the molecular level are characterized in real time by using the Fourier transform infrared (FTIR) spectroscopic technique. We develop a novel real-time method for ALWC calculation by reconstructing the absorption spectra of liquid water and realize real-time measurements of water content and dry nanoparticle mass to characterize hygroscopic growth factors (GFs). The calculated GFs are generally in good agreement with the Extended Aerosol Inorganics Model (E-AIM) predictions. We also explore the phenomenon that the deliquescence points of the ammonium sulfate / sodium nitrate (AS/SN) mixed nanoparticles and the AS / oxalic acid (AS/OA) mixed nanoparticles are lower than that of the pure AS. We further normalize the FTIR spectra of nanoparticles into 2D IR spectra and identify in real time the hydration interactions and the dynamic hygroscopic growth process of the functional groups for AS, AS/SN, and AS/OA nanoparticles. The results show that both SN and OA compounds can lower the deliquescence point of AS, but they affect AS differently. The SN can change but OA cannot change the hydrolysis reaction mechanism of AS during the hygroscopic growth process. Compared with previous studies, we captured more complex processes and the intermediate state of the hygroscopic growth of nanoparticles. This study not only can provide important information with respect to the difference in the phase transition point under different conditions but also can improve current understanding of the chemical interaction mechanism between nanoparticles (particularly for organic particles) and the surrounding medium, which is of great significance for investigation of haze formation in the atmosphere.

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“…Viskositas (43)(44)(45) Kosmetik (25)(26)(27) Ikatan ion (11; 46-48) Bau (4; 5) Titik Leleh (14; 56; 57) Tekanan Uap (58)(59)(60) Masa Molar (49)(50)(51)(52) Densitas (28)(29)(30)…”

Section: Kegunaan Karakteristik Sumbermentioning

confidence: 99%

Analisis Termodinamika Molekul Magnesium Sulphate (MgSO4)

Yuliani¹,

Zainul²

2018

Preprint

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Magnesium sulfat merupakan salah satu garam anorganik dengan rumus kimia MgSO4. Magnesium sulfat ini termasuk senyawa ionik karena terdapat ikatan antara logam magnesium dengan spesi non logam sulfat. Magnesium sulfat bersifat polar, bentuk anhidratnya sangat higroskopik dan mudah memiliki koordinasi dengan air. Umumnya magnesium sulfat terbentuk dalam formasi hidrat MgSO4.xH2O. Penelitian ini bertujuan untuk menganalisis pengaruh sifat termodinamika molekul MgSO4 terhadap interaksi molekuler di dalam senyawa tersebut. Metode yang digunakan ialah pemodelan dengan aplikasi ChemOffice 15.0. Sedangkan untuk data mobilitas ion, konduktivitas, viskositas, kecepatan hanyut dengan menggunakan perhitungan dan data dari hasil review beberapa jurnal penelitian yang berkaitan dengan magnesium sulfat sesuai tahapan yang tertera pada fishbond. Magnesium sulfat memiliki sifat termokimia dalam fasa solid dengan ∆𝐻𝑓,∆𝐺𝑓,𝑆°, 𝑑𝑎𝑛 𝐶𝑝 pada tekanan 1 atm dan suhu 25°C yang masing-masing mempunyai nilai -1284,9 kJ/mol, -1170,7 kJ/mol, 91,6 J/molK dan 96,48 J/molK. Mobilitas ion Mg2+dan SO42- adalah 5,50.10-8m2s-1V-1 dan 8,29.108m2s-1V-1. Panas reaksi standar (ΔHr°) MgSO4 bernilai negatif maka reaksi bersifat eksotermis

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Vacuum FTIR Observation on the Dynamic Hygroscopicity of Aerosols under Pulsed Relative Humidity

Cited by 33 publications

References 73 publications

Hygroscopic Growth and Phase Transitions of Na₂CO₃ and Mixed Na₂CO₃/Li₂CO₃ Particles: Influence of Li₂CO₃ on Phase Transitions of Na₂CO₃ and Formation of LiNaCO₃

Hygroscopic Growth and Phase Transitions of Na₂CO₃ and Mixed Na₂CO₃/Li₂CO₃ Particles: Influence of Li₂CO₃ on Phase Transitions of Na₂CO₃ and Formation of LiNaCO₃

Technical note: Real-time diagnosis of the hygroscopic growth micro-dynamics of nanoparticles with Fourier transform infrared spectroscopy

Analisis Termodinamika Molekul Magnesium Sulphate (MgSO4)

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Vacuum FTIR Observation on the Dynamic Hygroscopicity of Aerosols under Pulsed Relative Humidity

Cited by 33 publications

References 73 publications

Hygroscopic Growth and Phase Transitions of Na2CO3 and Mixed Na2CO3/Li2CO3 Particles: Influence of Li2CO3 on Phase Transitions of Na2CO3 and Formation of LiNaCO3

Hygroscopic Growth and Phase Transitions of Na2CO3 and Mixed Na2CO3/Li2CO3 Particles: Influence of Li2CO3 on Phase Transitions of Na2CO3 and Formation of LiNaCO3

Technical note: Real-time diagnosis of the hygroscopic growth micro-dynamics of nanoparticles with Fourier transform infrared spectroscopy

Analisis Termodinamika Molekul Magnesium Sulphate (MgSO4)

Contact Info

Product

Resources

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Hygroscopic Growth and Phase Transitions of Na₂CO₃ and Mixed Na₂CO₃/Li₂CO₃ Particles: Influence of Li₂CO₃ on Phase Transitions of Na₂CO₃ and Formation of LiNaCO₃

Hygroscopic Growth and Phase Transitions of Na₂CO₃ and Mixed Na₂CO₃/Li₂CO₃ Particles: Influence of Li₂CO₃ on Phase Transitions of Na₂CO₃ and Formation of LiNaCO₃