Measurement of electric properties of the single supersaturated aerosol droplet

He, KeJuan; Cheng, Hua; Zhu, Yi; Wang, LiangYu; Zhang, Yunhong

doi:10.1007/s11434-008-0243-3

Cited by 4 publications

(6 citation statements)

References 6 publications

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“…The measured DRH and ERH using this method were found to agree well with literature values for several compounds, e.g., NaCl, NaBr and KCl (Schindelholz et al, 2014c). In another study (He et al, 2008), the electrical conductivity and capacitance of a single droplet were measured as different RH to investigate hygroscopic properties of NaClO 4 particles. Overall, this method has not been widely applied to study atmospherically relevant particles and thus is not further discussed herein.…”

Section: Measurement Of Electrical Propertiessupporting

confidence: 78%

“…Deliquescence of ionic solids would lead to a significant increase in electrical conductivity and, vice versa, efflorescence of electrolyte solutions to ionic solids would cause a large decrease in electrical conductivity. Therefore, relative changes in electrical conductivity/impedance can be used to identify the occurrence of deliquescence and efflorescence (Yang et al, 2006;He et al, 2008;Schindelholz et al, 2014b, c). For example, in one study (Schindelholz et al, 2014c), micrometer-sized particles were deposited on an interdigitated microelectrode sensor housed in an environmental chamber, and the electrical impedance was detected online while RH in the chamber was varied.…”

Section: Measurement Of Electrical Propertiesmentioning

confidence: 99%

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A review of experimental techniques for aerosol hygroscopicity studies

Tang

Chan

et al. 2019

Atmos. Chem. Phys.

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Abstract. Hygroscopicity is one of the most important physicochemical properties of aerosol particles and also plays indispensable roles in many other scientific and technical fields. A myriad of experimental techniques, which differ in principles, configurations and cost, are available for investigating aerosol hygroscopicity under subsaturated conditions (i.e., relative humidity below 100 %). A comprehensive review of these techniques is provided in this paper, in which experimental techniques are broadly classified into four categories, according to the way samples under investigation are prepared. For each technique, we describe its operation principle and typical configuration, use representative examples reported in previous work to illustrate how this technique can help better understand aerosol hygroscopicity, and discuss its advantages and disadvantages. In addition, future directions are outlined and discussed for further technical improvement and instrumental development.

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Section: Measurement Of Electrical Propertiessupporting

confidence: 78%

Section: Measurement Of Electrical Propertiesmentioning

confidence: 99%

A review of experimental techniques for aerosol hygroscopicity studies

Tang

Chan

et al. 2019

Atmos. Chem. Phys.

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“…In another study, impedance was measured across 2 μL drops of salt solutions suspended between polished platinum electrodes while varying RH and monitoring with an optical microscope. 41 Using the impedance response coupled with visual appearance, the authors reported efflorescence relative humidity (ERH) and DRH values for several inorganic salts. In all cases the DRH values were at least 10% RH higher than the well-established values for these salts, which the authors attributed to surface roughness of the electrodes.…”

Section: ■ Introductionmentioning

confidence: 99%

“…In addition to study of surface sorption phenomena, relative changes in electrical impedance have been utilized for the determination of deliquescence and efflorescence. , Yang demonstrated the use of single frequency impedance measurements across electrodes bridged by salt-doped filter paper for determination of the deliquescence relative humidity (DRH) of single and mixed inorganic salts . Deliquescence was marked by a large drop in impedance caused by formation of bridging electrolyte.…”

Section: Introductionmentioning

confidence: 99%

Hygroscopic Particle Behavior Studied by Interdigitated Array Microelectrode Impedance Sensors

2013

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The hygroscopic behavior of soluble salts bears importance in many research fields including atmospheric sciences, corrosion, porous building materials, and pharmaceuticals. Several methods have been used to study deliquescence (solid to liquid) and efflorescence (liquid to solid) phase transitions of these salts. In this study, we measured the deliquescence and efflorescence RH values of single salt microparticles deposited on an interdigitated microelectrode sensor via electrical impedance. The salts examined were NaCl, LiCl, NaBr, KCl, and MgCl2. Measured values were in agreement with in situ optical microscopic observations and, with the exception of MgCl2, literature values. In the case of MgCl2, deliquescence occurred at 33% RH and 12-15% RH, with the latter range being previously unreported. The depressed deliquescence RH was hypothesized to be a result of the formation of a metastable MgCl2 hydrate. Incomplete efflorescence of MgCl2 was also observed after exposure to <1.5% RH for up to 22 h due to formation of solid shells which trapped fluid. The phenomena elucidated by these results provide an explanation for the anomalous water retention and uptake behavior of MgCl2 below 33% RH reported elsewhere in the literature. The results presented in this study validate the use of this method as an alternative or complementary method for study of bulk-phase transitions of substrate-deposited particles across a broad RH range. These findings also demonstrate the utility of this method for detection of fluid trapping which cannot be directly ascertained by gravimetric and line-of-sight techniques commonly used in the study of hygroscopic particles.

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“…Therefore, special electrodes and measuring system are designed as reported in our previous work [20] . Here, the electrodes and system are shown in Figure 1.…”

Section: The System For Measuring Conductance Of Chloride Microdropletsmentioning

confidence: 99%

Study on conductance of supersaturated chloride microdroplets

Cheng

Zhu

et al. 2009

Sci. China Ser. B-Chem.

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By using the measuring system previously designed by the authors, the conductance of KCl, NaCl and NH 4 Cl microdroplets is obtained in the whole measuring RH range, especially in the supersaturation region, which cannot be acquired from the bulk solutions and fills the gap of lack of experimental data of conductance under the supersaturated state. The ERH and DRH of these three kinds of microdroplets observed from a microscope are 80.5% and 95.4% (KCl), 75.7% and 93.3% (NaCl), and 69.9% and 96.6% (NH 4 Cl), respectively. In addition, it can be found from the dependence of conductance on RH that conductance is very sensitive to the existence of water molecules inside the microdroplet and the threshold of the deliquescence process can be predicted by the variation of conductance.

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Measurement of electric properties of the single supersaturated aerosol droplet

Cited by 4 publications

References 6 publications

A review of experimental techniques for aerosol hygroscopicity studies

A review of experimental techniques for aerosol hygroscopicity studies

Hygroscopic Particle Behavior Studied by Interdigitated Array Microelectrode Impedance Sensors

Study on conductance of supersaturated chloride microdroplets

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