Surface tension of aqueous solutions of water-soluble organic and inorganic compounds

Tuckermann, Rudolf

doi:10.1016/j.atmosenv.2007.03.051

Cited by 123 publications

(101 citation statements)

References 32 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the case of saline solutions, surface tension also depends on the local salt concentration and can be approximated to a linear function of temperature and solute concentration (Eq. 7) (Zhang et al 2007;Tuckermann 2007):…”

Section: Interpretation Of the Experimental Resultsmentioning

confidence: 99%

3D visualization of convection patterns in lab-on-chip with open microfluidic outlet

Gazzola

Scarselli

Guerrieri

2009

Microfluid Nanofluid

View full text Add to dashboard Cite

Open-outlet microfluidics is getting more and more attention, thanks to the generation of capillarity-driven flows which simplify the connection with the macroworld. It is known that convection flows are generated at the interface with air, i.e., the meniscus. Several works have investigated evaporation-induced convection, but its effect on particle position control in open-outlet biodevices is still not characterized. In this paper, we present the results of 3D measurement of particle traces near the meniscus in an open-outlet vertical 400 lm micro-channel filled with a water-based saline solution. Using a standard optical microscope and a system of mirrors, we observe the 3D position of individual micro-beads floating in the solution, in a way akin to particle image velocimetry technique. A single vortex is generated at the meniscus and occupies the whole region under observation at a distance of 1.5-2.7 mm from the meniscus. The generation of the convection pattern and the vortex rotational speed are described. The convection patterns disappear when evaporation is inhibited, while both the vortex generation and the rotational speed are faster for highly saline solutions. These results are relevant to the design of biochips which require control of the particle position in a fluid since they emphasize that in open-outlet microfluidic systems not only the gravitational fall but also the convection drag must be counteracted.

show abstract

Section: Interpretation Of the Experimental Resultsmentioning

confidence: 99%

3D visualization of convection patterns in lab-on-chip with open microfluidic outlet

Gazzola

Scarselli

Guerrieri

2009

Microfluid Nanofluid

View full text Add to dashboard Cite

show abstract

“…The effect of various organic acids on the surface tension of water has been studied earlier (Shulman et al, 1996;Tuckermann and Cammenga 2004;Hyvärinen et al, 2006). There are also few measurements on the surface tensions of solutions containing both inorganic salt and organic acid Topping et al, 2006;Tuckermann 2007), but the data is scarce and cover usually only limited temperature and/or concentration range. There are also some studies where surface tensions of multicomponent systems have been calculated by using entirely predictive models (Li and Lu 2001;Topping et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Ternary solution of sodium chloride, succinic acid and water; surface tension and its influence on cloud droplet activation

et al. 2008

View full text Add to dashboard Cite

Abstract. Surface tension of ternary solution of sodium chloride, succinic acid and water was measured as a function of both composition and temperature by using the capillary rise technique. Both sodium chloride and succinic acid are found in atmospheric aerosols, the former being main constituent of marine aerosol. Succinic acid was found to decrease the surface tension of water already at very low concentrations. Sodium chloride increased the surface tension linearly as a function of the concentration. Surface tensions of both binary solutions agreed well with the previous measurements. Succinic acid was found to lower the surface tension even if sodium chloride is present, indicating that succinic acid, as a surface active compound, tends to concentrate to the surface. An equation based on thermodynamical relations was fitted to the data and extrapolated to the whole concentration range by using estimated surface tensions for pure compounds. As a result, we obtained an estimate of surface tensions beyond solubility limits in addition to a fit to the experimental data. The parameterization can safely be used at temperatures from 10 to 30 • C. These kinds of parameterizations are important for example in atmospheric nucleation models. To investigate the influence of surface tension on cloud droplet activation, the surface tension parameterization was included in an adiabatic air parcel model. Usually in cloud models the surface tension of pure water is used. Simulations were done for characteristic marine aerosol size distributions consisting of the considered ternary mixture. We found that by using the surface tension of pure water, the amount of activated particles is underestimated up to 8% if particles contain succinic acid and overestimated it up to 8% if particles contain only sodium chloride. The surface tension effect was found to increase with increasing updraft velocity.

show abstract

“…In macroscopic solutions, a strong surfactant can yield a large reduction in surface tension, compared to pure water, at a given concentration by being strongly partitioned to the surface and/or displaying molecular interactions to enable efficient reduction in the solution surface tension. Inorganic salts can influence individual surfactant properties (Lin et al, 2005;Tuckermann, 2007;Vanhanen et al, 2008;Prisle et al, 2010) by enhancing surfactant activity in solution through both solute-solute non-ideal interactions and common ions decreasing the contribution from organic ions to the overall surfactant solubility product. Surfactant strength, as quantified in Eq.…”

Section: Surface Partitioningmentioning

confidence: 99%

A simple representation of surface active organic aerosol in cloud droplet formation

2011

View full text Add to dashboard Cite

Abstract. Atmospheric aerosols often contain surface active organics. Surface activity can affect cloud droplet formation through both surface partitioning and surface tension reduction in activating droplets. However, a comprehensive thermodynamic account for these effects in Köhler modeling is computationally demanding and requires knowledge of both droplet composition and component molecular properties, which is generally unavailable. Here, a simple representation of activation properties for surface active organics is introduced and compared against detailed model predictions and laboratory measurements of CCN activity for mixed surfactant-salt particles from the literature. This simple organic representation is seen to work well for aerosol organic-inorganic composition ranges typically found in the atmosphere, and agreement with both experiments and detailed model predictions increases with surfactant strength. The simple representation does not require resolution of the organic aerosol composition and relies solely on properties of the organic fraction that can be measured directly with available techniques. It can thus potentially be applied to complex and ambient surface active aerosols. It is not computationally demanding, and therefore has high potential for implementation to atmospheric models accounting for cloud microphysics.

show abstract

Surface tension of aqueous solutions of water-soluble organic and inorganic compounds

Cited by 123 publications

References 32 publications

3D visualization of convection patterns in lab-on-chip with open microfluidic outlet

3D visualization of convection patterns in lab-on-chip with open microfluidic outlet

Ternary solution of sodium chloride, succinic acid and water; surface tension and its influence on cloud droplet activation

A simple representation of surface active organic aerosol in cloud droplet formation

Contact Info

Product

Resources

About