Phase transitions in calcium nitrate thin films

Al‐Abadleh, Hind A.; Krueger, Brenda J.; Ross, Jean L.; Grassian, Vicki H.

doi:10.1039/b308632a

Cited by 49 publications

(77 citation statements)

References 18 publications

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“…Given that most of the troposphere is characterized by moderate to high relative humidities, such experiments have an inherent limitation which can restrict their applicability for modeling. Other techniques have also been used to investigate water adsorption on mineral surfaces, including transmittance-FTIR (Al-Abadleh et al, 2003) and attenuated total reflectance spectroscopy (ATR-FTIR) (Al-Abadleh et al, 2005;Al-Hosney and Grassian, 2005). The underlying problem of the above-mentioned techniques is the lack of an absolute calibration making it highly desirable to verify reported results (Al-Abadleh et al, 2005 by independent techniques.…”

Section: Discussionmentioning

confidence: 99%

“…3) show that monolayer coverage occurs at about 50% relative humidity, in good agreement with ATR-FTIR data . TGA allowed the absolute and reliable isotherm to be defined over a large relative humidity range whereas that measured by Grassian et al (2003 allowed only the identification of monolayer coverage. Arizona test dust consists principally of silica (∼70%) and alumina (∼20%) with small amounts of other minerals (oxides of iron, titanium, calcium etc.).…”

Section: Discussionmentioning

confidence: 99%

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A comprehensive evaluation of water uptake on atmospherically relevant mineral surfaces: DRIFT spectroscopy, thermogravimetric analysis and aerosol growth measurements

et al. 2005

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Abstract. The hygroscopicity of mineral aerosol samples has been examined by three independent methods: diffuse reflectance infrared Fourier transform spectroscopy, thermogravimetric analysis and differential mobility analysis. All three methods allow an evaluation of the water coverage of two samples, CaCO 3 and Arizona Test dust, as a function of relative humidity. For the first time, a correlation between absolute gravimetric measurements and the other two (indirect) methods has been established. Water uptake isotherms were reliably determined for both solids which at 298 K and 80% relative humidity exhibited similar coverages of ∼4 monolayers. However, the behaviour at low relative humidity was markedly different in the two cases, with Arizona Test Dust showing a substantially higher affinity for water in the contact layer. This is understandable in terms of the chemical composition of these two materials. The mobility analysis results are in good accord with field observations and with our own spectroscopic and gravimetric measurements. These findings are of value for an understanding of atmospheric chemical processes.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

A comprehensive evaluation of water uptake on atmospherically relevant mineral surfaces: DRIFT spectroscopy, thermogravimetric analysis and aerosol growth measurements

et al. 2005

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“…These reactions not only change atmospheric trace gas distributions but also modify the composition and mixing state of particles, and consequently affect the thermodynamic and optical properties of particles. For example, Ca(NO 3 ) 2 /CaCO 3 mixture formed from heterogeneous reaction between nitric acid and calcite has been observed in both field measurement and laboratory studies (Al-Abadleh et al, 2003;Laskin et al, 2005;. Soluble calcium nitrate formed on calcite surface enormously enhanced the hygroscopicity of the mixtures and reactivity to other soluble gases (Al-Abadleh et al, 2003;Liu et al, 2008;Prince et al, 2008).…”

Section: Introductionmentioning

confidence: 99%

Synergistic effect in the humidifying process of atmospheric relevant calcium nitrate, calcite and oxalic acid mixtures

2012

Atmospheric Environment

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a b s t r a c tHygroscopicity is a critical property for evaluating aerosol's environmental and climate impacts. Traditional view always considered hygroscopic behavior of aerosol as a water adsorption/absorptionedesorption cycle in which the size, water content and morphology etc. are well characterized. However, the chemical reactions between coexisting components in mixed particles during humidifying-dehumidifying process are almost neglected. In this study, we found that there exists synergistic effect among Ca(NO 3 ) 2 , CaCO 3 and H 2 C 2 O 4 mixtures during humidifying process. Substitution of strong acid (HNO 3 ) by medium acid (H 2 C 2 O 4 ) take place during vapor absorption on Ca(NO 3 ) 2 /H 2 C 2 O 4 mixture. Moreover, the presence of nitrate exhibits a promotive effect to the reaction between H 2 C 2 O 4 and CaCO 3 under ambient condition. These results provoke us to rethink the hygroscopic behavior of mixed aerosol in which chemical reaction can greatly change the chemical composition, mixing state and consequently environmental and climate impacts.

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“…In different systems, water adsorption appears to positively correlate with the material rugosity. For instance, adsorbed films on rough calcite were significantly thicker (2-to 40-fold) than those on smooth calcite [96,97]. Similarly, the thickness of brine films on silica increased over 100 times with surface roughness [104].…”

Section: Wetting Film Thicknessmentioning

confidence: 89%

Colloidal crystals and water: Perspectives on liquid–solid nanoscale phenomena in wet particulate media

Gallego-Gómez

Morales‐Flórez

Morales

et al. 2016

Advances in Colloid and Interface Science

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Solid colloidal ensembles inherently contain water adsorbed from the ambient moisture. This water, confined in the porous network formed by the building submicron spheres, greatly affects the ensemble properties. Inversely, one can benefit from such influence on collective features to explore the water behavior in such nanoconfinements. Recently, novel approaches have been developed to investigate in-depth where and how water is placed in the nanometric pores of self-assembled colloidal crystals. Here we summarize these advances, along with new ones, that are linked to general interfacial water phenomena like adsorption, capillary forces and flow. Waterdependent structural properties of the colloidal crystal give clues to the interplay between nanoconfined water and solid fine particles that determines the behavior of ensembles. We elaborate on how the knowledge gained on water in colloidal crystals provides new opportunities for multidisciplinary study of interfacial and nanoconfined liquids and their essential role in the physics of utmost important systems such as particulate media.

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Phase transitions in calcium nitrate thin films

Cited by 49 publications

References 18 publications

A comprehensive evaluation of water uptake on atmospherically relevant mineral surfaces: DRIFT spectroscopy, thermogravimetric analysis and aerosol growth measurements

A comprehensive evaluation of water uptake on atmospherically relevant mineral surfaces: DRIFT spectroscopy, thermogravimetric analysis and aerosol growth measurements

Synergistic effect in the humidifying process of atmospheric relevant calcium nitrate, calcite and oxalic acid mixtures

Colloidal crystals and water: Perspectives on liquid–solid nanoscale phenomena in wet particulate media

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