A comprehensive study of hygroscopic properties of calcium- and 
magnesium-containing salts: implication for hygroscopicity of mineral dust and sea salt aerosols

Guo, Lingjun; Gu, Wei; Peng, Feng; Wang, Weigang; Li, Yong Jie; Zong, Taomou; Tang, Yujing; Wu, Zhijun; Lin, Qinhao; Ge, Maofa; Zhang, Guohua; Hu, Min; Bi, Xinhui; Wang, Xinming; Tang, Mingjin

doi:10.5194/acp-2018-412

Cited by 18 publications

(21 citation statements)

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“…In fact, SD exhibited significant and continuous growth even at lower RH: for example, its mass grow factors were found to be ~1.03 and ~1.08 at 30% and 60%, respectively. This is because SD contained similar amount of soluble magnesium and sodium ions, and magnesium salts (e.g., MgCl 2 ) would deliquesce at considerably lower RH (Cziczo & Abbatt, ; Guo et al, ; Gupta et al, ). As magnesium salts might exist in amorphous states, they were not detected via XRD.…”

Section: Resultsmentioning

confidence: 99%

“…Measurements were all carried out at room temperature (25 ± 0.1 °C). Since instrumental and operational details can be found in our previous work (Gu et al, ; Guo et al, ; Tang et al, ), here we only provide a brief description of key features. The mass measurement range and sensitivity were 0–100 mg and 0.01 μg, and the dry mass of samples examined in this work was in the range of 1–10 mg, depending on their hygroscopicity.…”

Section: Methodsmentioning

confidence: 99%

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Hygroscopic Properties of Saline Mineral Dust From Different Regions in China: Geographical Variations, Compositional Dependence, and Atmospheric Implications

Tang

Zhang

et al. 2019

JGR Atmospheres

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Saline mineral dust particles, emitted from saline topsoil in arid and semiarid regions, contribute significantly to tropospheric aerosol particles. However, hygroscopic properties of saline mineral dust particles, especially for those found in regions other than North America, are poorly understood. In this work we investigated hygroscopic properties of 13 saline mineral dust samples collected from different locations via measuring sample mass change at different relative humidity (RH; up to 90%), and measured their chemical and mineralogical compositions using ion chromatography and X‐ray diffraction. The mass growth factors at 90% RH, defined as the sample mass at 90% RH relative to that at <1% RH, were found to display large geographical variations, spanning from ~1.02 to 6.7, and the corresponding single hygroscopicity parameters (κ) were derived to be in the range of <0.01 to >1.0. The saline components (mainly Na+, Cl−, and SO42−) contained by saline mineral dust particles largely determined their hygroscopicity, and the predicted mass growth factors at 90% RH using an aerosol thermodynamic model (ISORROPIA‐II), agreed with measured values within 20% for most of samples examined, although larger discrepancies also occurred for three samples. Our results improve our understanding in hygroscopicity of saline mineral dust particles and thus their heterogeneous chemistry and ability to serve as cloud condensation nuclei to form cloud droplets.

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Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Hygroscopic Properties of Saline Mineral Dust From Different Regions in China: Geographical Variations, Compositional Dependence, and Atmospheric Implications

Tang

Zhang

et al. 2019

JGR Atmospheres

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“…5b, a relative mass change of <0.025% within 6 h could be accurately determined. This instrument was further employed to investigate hygroscopic properties of perchlorates (Gu et al, 2017a;Jia et al, 2018), Ca-and Mgcontaining salts (Guo et al, 2019), and primary biological particles (Tang et al, 2019), which play significant roles in the environments of the earth and the Mars. To our knowledge, the VSA technique has not yet been used to explore hygroscopic properties of ambient aerosol particles.…”

Section: Thermogravimetric Analysismentioning

confidence: 99%

A review of experimental techniques for aerosol hygroscopicity studies

Tang¹,

Chan²,

Li³

et al. 2019

Preprint

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<p><strong>Abstract.</strong> 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&#8201;%). 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.</p>

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“…Storage in a close system (desiccator) was investigated using CaCl 2 and MgCl 2 as they are the most commonly used desiccants [ 28 , 29 ]. Films stored under saturated MgCl 2 solution at 4 °C appeared gelatinous and therefore difficult to handle and sticky in comparison to a fresh film; this was probably due to rehydration and gelation-type effects on alginate.…”

Section: Resultsmentioning

confidence: 99%

Development and Characterization of Xanthan Gum and Alginate Based Bioadhesive Film for Pycnogenol Topical Use in Wound Treatment

et al. 2021

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Pycnogenol (PYC) is a concentrate of phenolic compounds derived from French maritime pine; its biological activity as antioxidant, anti-inflammatory and antibacterial suggests its use in the treatment of open wounds. A bioadhesive film, loaded with PYC, was prepared by casting, starting with a combination of two biopolymer acqueous solutions: xanthan gum (1% wt/wt) and sodium alginate (1.5% wt/wt), in a 2.5/7.5 (wt/wt) ratio. In both solutions, glycerol (10% wt/wt) was added as plasticizing agent. The film resulted in an adhesive capable to absorb a simulated wound fluid (~65% wt/wt within 1 h), therefore suitable for exuding wounds. The mechanical characterization showed that the film is deformable (elastic modulus E = 3.070 ± 0.044 MPa), suggesting adaptability to any type of surface and resistance to mechanical solicitations. PYC is released within 24 h by a sustained mechanism, achieving a maximum concentration of ~ 0.2 mg/mL, that is safe for keratinocytes, as shown by cytotoxicity studies. A concentration of 0.015 mg/mL is reached in the first 5 min after application, at which point PYC stimulates keratinocyte growth. These preliminary results suggest the use of PYC in formulations designed for topical use.

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A comprehensive study of hygroscopic properties of calcium- and magnesium-containing salts: implication for hygroscopicity of mineral dust and sea salt aerosols

Abstract: 23Calcium-and magnesium-containing salts are important components for mineral dust and 24 sea salt aerosols, but their physicochemical properties are not well understood yet.

Cited by 18 publications

References 1 publication

Hygroscopic Properties of Saline Mineral Dust From Different Regions in China: Geographical Variations, Compositional Dependence, and Atmospheric Implications

Hygroscopic Properties of Saline Mineral Dust From Different Regions in China: Geographical Variations, Compositional Dependence, and Atmospheric Implications

A review of experimental techniques for aerosol hygroscopicity studies

Development and Characterization of Xanthan Gum and Alginate Based Bioadhesive Film for Pycnogenol Topical Use in Wound Treatment

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