Research Note: Values of Six Saturated Salt Solutions at 25°C. Re-examination for the Purpose of Maintaining a Constant Relative Humidity in Water Sorption Measurements

Pollio, M.L.; Kitic, D.; Resnik, Silvia L.

doi:10.1006/fstl.1996.0058

Cited by 15 publications

(8 citation statements)

References 10 publications

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“…Using the isopiestic method, we also measured the water activity of the saturated SrCl 2 solution and the solubility at 298.15 K and found their values were 0.7121 ± 0.0013 and (3.5125 ± 0.014) mol·kg –1 , respectively. Rard gave a solubility value of 3.5195 ± 0.0022 mol·kg –1 for SrCl 2 ·6H 2 O in the same experimental method, and Pollio predicted the water activity of saturated SrCl 2 solution at 298.15 K using the Pitzer model, the value of which is 0.712. We did not detect the crystal type in equilibrium with the saturated solution.…”

Section: Resultsmentioning

confidence: 95%

Isopiestic Measurement and Solubility Evaluation of the Ternary System LiCl–SrCl₂–H₂O at 298.15 K

et al. 2012

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Water activity in the ternary system LiCl–SrCl2–H2O and its sub-binary systems has been elaborately measured by the isopiestic method. The measured water activities were used to justify the reliability of solubility isotherms reported in literature by correlating them with two thermodynamic models, that is, the extended Pitzer model and the Pitzer–Simonson–Clegg model. It was found that the extended Pitzer model cannot correlate consistently the water activities measured and either set of the solubility isotherms reported in literature for this concerned system, no matter how its parameters were adjusted. However, the Pitzer–Simonson–Clegg model can correlate consistently our measured water activities and the solubility isotherms reported by the literature (Kydynov et al. Issled. Obl. Khim. Tekhnol. Miner. Solei Okislov 1965, 146–150), which should be more reliable than solubility data reported in other references.

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Section: Resultsmentioning

confidence: 95%

Isopiestic Measurement and Solubility Evaluation of the Ternary System LiCl–SrCl₂–H₂O at 298.15 K

et al. 2012

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“…The saturation was achieved by mixing a large excess of each salt with deionized water. 34 Before the experiments, membranes were dried 240 h over P 2 O 5 and a final measurement was made in presence of pure water.…”

Section: Water Vapor Uptake Measurementsmentioning

confidence: 99%

Crosslinked SPEEK membranes: Mechanical, thermal, and hydrothermal properties

et al. 2012

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The thermal and mechanical behavior, the water uptake (WU), and water diffusion coefficient of sulfonated poly(ether ether ketone) (SPEEK)membranes annealed at 180 degrees C for different times were explored by high-resolution thermogravimetric analysis, mechanical tensile tests, dynamic mechanical analysis, and WU measurements. The mechanical and thermal stability increased with the thermal treatment time, i.e., with the degree of crosslinking. The effect of residual casting solvent, dimethyl sulfoxide (DMSO), on the WU within SPEEK was probed. In presence of residual DMSO, crosslinked SPEEK exhibited higher water sorption at low and medium relative humidity (RH), and lower water sorption at high RH. These membranes have properties well adapted to fuel cell applications

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“…But, if the chamber is loosely closed, it is easy to create a vapor balance that allows producing specific humidity values. Earlier methods [19,20,22,24] to control humidity relied on some form of additional salt solution that introduced yet another chemical to the system (the salt) and required an additional setup and constant convection (via a pump). With the method described here, we overcome the need for convection, and allow for the first time to control humidity or suppress evaporation without applying wind.…”

Section: Discussionmentioning

confidence: 99%

“…A number of methods have been introduced for this end, and as a rule they utilize either solutions of different salts [19], or, more commonly, saturated salt solutions [20][21][22] (the saturation maintains constant salt concentration in the solution and therefore produces constant humidity). There are various disadvantages to these methods: and the main one is the introduction of another chemical (the salt solution) which can contaminate the system [23,24] or corrode it or both.…”

Section: Introductionmentioning

confidence: 99%

Controlling arbitrary humidity without convection

Wasnik

N’guessan

Tadmor

2015

Journal of Colloid and Interface Science

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In this paper we show a way that allows for the first time to induce arbitrary humidity of desired value for systems without convective flow. To enable this novelty we utilize a semi-closed environment in which evaporation is not completely suppressed. In this case, the evaporation rate is determined both by the outer (open) humidity and by the inner (semi-closed) geometry including the size/shape of the evaporating medium and the size/shape of the semi-closure. We show how such systems can be used to induce desired humidity conditions. We consider water droplet placed on a solid surface and study its evaporation when it is surrounded by other drops, hereon "satellite" drops and covered by a semi-closed hemisphere. The main drop's evaporation rate is proportional to its height, in agreement with theory. Surprisingly, however, the influence of the satellite drops on the main drop's evaporation suppression is not proportional to the sum of heights of the satellite drops. Instead, it shows proportionality close to the satellite drops' total surface area. The resultant humidity conditions in the semi-closed system can be effectively and accurately induced using different satellite drops combinations.

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Research Note: Values of Six Saturated Salt Solutions at 25°C. Re-examination for the Purpose of Maintaining a Constant Relative Humidity in Water Sorption Measurements

Cited by 15 publications

References 10 publications

Isopiestic Measurement and Solubility Evaluation of the Ternary System LiCl–SrCl₂–H₂O at 298.15 K

Isopiestic Measurement and Solubility Evaluation of the Ternary System LiCl–SrCl₂–H₂O at 298.15 K

Crosslinked SPEEK membranes: Mechanical, thermal, and hydrothermal properties

Controlling arbitrary humidity without convection

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Research Note: Values of Six Saturated Salt Solutions at 25°C. Re-examination for the Purpose of Maintaining a Constant Relative Humidity in Water Sorption Measurements

Cited by 15 publications

References 10 publications

Isopiestic Measurement and Solubility Evaluation of the Ternary System LiCl–SrCl2–H2O at 298.15 K

Isopiestic Measurement and Solubility Evaluation of the Ternary System LiCl–SrCl2–H2O at 298.15 K

Crosslinked SPEEK membranes: Mechanical, thermal, and hydrothermal properties

Controlling arbitrary humidity without convection

Contact Info

Product

Resources

About

Isopiestic Measurement and Solubility Evaluation of the Ternary System LiCl–SrCl₂–H₂O at 298.15 K

Isopiestic Measurement and Solubility Evaluation of the Ternary System LiCl–SrCl₂–H₂O at 298.15 K