Technical note: Frenkel, Halsey and Hill analysis of water on clay minerals: toward closure between cloud condensation nuclei activity and water adsorption

Hatch, C. D.; Tumminello, Paul; Cassingham, Megan A.; Greenaway, Ann L.; Meredith, Rebecca; Christie, Matthew J.

doi:10.5194/acp-19-13581-2019

Cited by 12 publications

(23 citation statements)

References 36 publications

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“…The driving factors of this anisotropy involve heterogeneous distributions of capture zones for water on mineral surfaces and the high surface tension of water. These findings validate previous concerns for theoretical frameworks predicting layer-by-layer growth (8,37).…”

Section: Discussionsupporting

confidence: 88%

“…The high surface tension of water is responsible for smoothing the film surface over the particle surface. Because of the inability of theoretical adsorption models in predicting the forms of water films associated to mineral surfaces (8,37), our imaging and computational work provides the foundation for determining which types of refinements should be most physically justified and important to incorporate in future models.…”

Section: Discussionmentioning

confidence: 99%

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Direct observation of anisotropic growth of water films on minerals driven by defects and surface tension

et al. 2020

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Knowledge of the occurrences of water films on minerals is critical for global biogeochemical and atmospheric processes, including element cycling and ice nucleation. The underlying mechanisms controlling water film growth are, however, misunderstood. Using infrared nanospectroscopy, amplitude-modulated atomic force microscopy, and molecular simulations, we show how water films grow from water vapor on hydrophilic mineral nanoparticles. We imaged films with up to four water layers that grow anisotropically over a single face. Growth usually begins from the near edges of a face where defects preferentially capture water vapor. Thicker films produced by condensation cooling completely engulf nanoparticles and form thicker menisci over defects. The high surface tension of water smooths film surfaces and produces films of inhomogeneous thickness. Nanoscale topography and film surface energy thereby control anisotropic distributions and thicknesses of water films on hydrophilic mineral nanoparticles.

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Section: Discussionsupporting

confidence: 88%

Section: Discussionmentioning

confidence: 99%

Direct observation of anisotropic growth of water films on minerals driven by defects and surface tension

et al. 2020

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“…where N A is Avogadro's constant (6.02 × 10 23 mol −1 ), M w is the molar mass of water (18 g mol −1 ), A w is the surface area each adsorbed water molecule would occupy (assumed to be 1 × 10 −15 cm 2 ) (Schuttlefield et al, 2007a;Hatch et al, 2014;Tang et al, 2016) and A BET is the BET surface (in cm 2 g −1 ) of the mineral dust under consideration. Tables 2-5 summarize m w /m 0 and θ as a function of RH for all the mineral dust examined in our work.…”

Section: Water Uptake By Different Mineral Dustmentioning

confidence: 99%

“…It can alter the radiative forcing of the earth both directly (Balkanski et al, 2007;Huang et al, 2014;Di Biagio et al, 2017) and indirectly (Cziczo et al, 2013;Karydis et al, 2017). Mineral dust can also change the abundance of reactive trace gases as well as aerosol compositions via heterogeneous reactions (Usher et al, 2003;Dupart et al, 2012;He et al, 2014;Tang et al, 2017;Yu and Jang, 2019). Furthermore, the deposition of mineral dust will bring substantial amounts of nutrients (e.g., Fe and P) into some marine and terrestrial ecosystems, thereby largely affecting biogeochemistry in these regions (Jickells et al, 2005;Okin et al, 2011;Schulz et al, 2012;Li et al, 2017;Tagliabue et al, 2017;Meskhidze et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

On mineral dust aerosol hygroscopicity

Chen

Peng

et al. 2020

Atmos. Chem. Phys.

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Abstract. Despite its importance, hygroscopicity of mineral dust aerosol remains highly uncertain. In this work, we investigated water adsorption and hygroscopicity of different mineral dust samples at 25 ∘C, via measurement of sample mass at different relative humidity (RH, up to 90 %) using a vapor sorption analyzer. Mineral dust samples examined (21 in total) included seven authentic mineral dust samples from different regions in the world and 14 major minerals contained in mineral dust aerosol. At 90 % RH, the mass ratios of adsorbed water to the dry mineral ranged from 0.0011 to 0.3080, largely depending on the BET surface areas of mineral dust samples. The fractional surface coverages of adsorbed water were determined to vary between 1.26 and 8.63 at 90 % RH, and it was found that the Frenkel–Halsey–Hill (FHH) adsorption isotherm could describe surface coverages of adsorbed water as a function of RH well, with AFHH and BFHH parameters in the range of 0.15–4.39 and 1.10–1.91, respectively. The comprehensive and robust data obtained would largely improve our knowledge of hygroscopicity of mineral dust aerosol.

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“…28into Köhler model (Eq. 6) the parameters and 360 can be estimated (Romakkaniemi et al, 2001;Sorjamaa and Laaksonen, 2007;Hatch, et al, 2019).…”

Section: Surface Adsorption 350mentioning

confidence: 99%

High humidity tandem differential mobility analyzer for accurate determination of aerosol hygroscopic growth, microstructure and activity coefficients over a wide range of relative humidity

Mikhailov¹,

Vlasenko²

2019

Preprint

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Abstract. Interactions with water are crucial for the properties, transformation and climate effects of atmospheric aerosols. Here we present high humidity tandem differential hygroscopicity analyzer (HHTDMA) and a new method to measure the hygroscopic growth of aerosol particles with in-situ restructuring to minimize the influence of particle shape. With this approach, growth factors can be measured with an uncertainty 0.3–0.9 % over a relative humidity (RH) range of 2–99.6 % and with an RH measurement accuracy better than 0.4 %. The HHTDMA instrument can be used in hydration, dehydration and restructuring modes of operation. The restructuring mode allows to investigate the effects of drying conditions on the initial microstructure of aerosol particles and specified the optimal parameters that provide their rearrangements into compact structures with near-spherical shape. These optimal parameters were then used in hygroscopic growth experiments by combining restructuring mode with conventional hydration or dehydration mode. The tandem of two modes allowed us to measure the particle growth factors with high precision as well as to determine the thickness of the water adsorption layer on the surface of compact crystalline particles. To verify HHTDMA instrument we compared the measured ammonium sulfate growth factors with these obtained from E-AIM-based Köhler model. Averaged over the range of 38–96 % RH, the mean relative deviations between measurement and model results is less than 0.5 %. We demonstrate this precision by presenting data for glucose for which bulk thermodynamic coefficients are available. The HHTDMA-derived activity coefficients of water and glucose were obtained for both dilute and supersaturated solutions and are in a good agreement with these reported in literature. Averaged deviation between the measured activity coefficients and these obtained by bulk method is less than 4 %. For dilute solution in water activity range of 0.98–0.99 the hygroscopicity parameter of glucose and molal osmotic coefficient were obtained with uncertainty of 0.4 % and 2.5 %, respectively.

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Technical note: Frenkel, Halsey and Hill analysis of water on clay minerals: toward closure between cloud condensation nuclei activity and water adsorption

Cited by 12 publications

References 36 publications

Direct observation of anisotropic growth of water films on minerals driven by defects and surface tension

Direct observation of anisotropic growth of water films on minerals driven by defects and surface tension

On mineral dust aerosol hygroscopicity

High humidity tandem differential mobility analyzer for accurate determination of aerosol hygroscopic growth, microstructure and activity coefficients over a wide range of relative humidity

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