The capillary constant in calculating the surface tension of liquids

Kashin, V. V.; Shakirov, K. M.; Poshevneva, A. I.

doi:10.3103/s0967091211100093

Cited by 3 publications

(6 citation statements)

References 1 publication

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“…As a result, the actual MMA is larger than predicted from the amount of lipid deposited, which directly reflects in an overall lower P. It would be desirable to apply a correction factor taking into account the real interface area of the meniscus in the miniaturized chambers. However, whereas the meniscus shape in capillaries (i.e., cavity radius much smaller than the height of the liquid) has been subject to theoretical studies (43,44), no analytical expression is known for a cylindrical well structure as used in this study. Additionally, the contact angle of aqueous buffer and plasma cleaned PTFE is unknown.…”

Section: Lipid Diffusion Coefficient Is An Effective Tool To Characterize the Monolayer Statementioning

confidence: 99%

FCS Analysis of Protein Mobility on Lipid Monolayers

Khmelinskaia

Mücksch

Conci

et al. 2018

Biophysical Journal

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In vitro membrane model systems are used to dissect complex biological phenomena under controlled unadulterated conditions. In this context, lipid monolayers are a powerful tool to particularly study the influence of lipid packing on the behavior of membrane proteins. Here, monolayers deposited in miniaturized fixed area-chambers, which require only minute amounts of protein, were used and shown to faithfully reproduce the characteristics of Langmuir monolayers. This assay is ideally suited to be combined with single-molecule sensitive fluorescence correlation spectroscopy (FCS) to characterize diffusion dynamics. Our results confirm the influence of lipid packing on lipid mobility and validate the use of FCS as an alternative to conventional surface pressure measurements for characterizing the monolayer. Furthermore, we demonstrate the effect of lipid density on the diffusional behavior of membrane-bound components. We exploit the sensitivity of FCS to characterize protein interactions with the lipid monolayer in a regime in which the monolayer physical properties are not altered. To demonstrate the potential of our approach, we analyzed the diffusion behavior of objects of different nature, ranging from a small peptide to a large DNA-based nanostructure. Moreover, in this work we quantify the surface viscosity of lipid monolayers. We present a detailed strategy for the conduction of point FCS experiments on lipid monolayers, which is the first step toward extensive studies of protein-monolayer interactions.

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Section: Lipid Diffusion Coefficient Is An Effective Tool To Characterize the Monolayer Statementioning

confidence: 99%

FCS Analysis of Protein Mobility on Lipid Monolayers

Khmelinskaia

Mücksch

Conci

et al. 2018

Biophysical Journal

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“…where ρl and ρg are the densities of the liquid and the gas within the capillary, respectively, and B is the liquid-specific capillary constant (m) (Labuntcov and Yagov, 2007;Mayer, 2008;Richards and Carver, 1921). The capillary constant can sometimes be expressed through the capillary radius, too (Kashin et al, 2011):…”

Section: Theoretical Foundations Of the Capillary Constantmentioning

confidence: 99%

“…where r is the radius of the capillary (m). Kashin et al (2011) noted that equation 7 is incorrect due to uncertainties related to the interpretation of the liquid height. The liquid height, h, can be defined as the height up to the bottom of the meniscus or up to the maximum height of the liquid at the pore walls.…”

Section: Theoretical Foundations Of the Capillary Constantmentioning

confidence: 99%

“…Different researchers, thus, can interpret the height differently, ending up with differing capillary constants. Kashin et al (2011) suggested calculating the capillary constant using a strictly defined volume of a liquid in the capillary:…”

Section: Theoretical Foundations Of the Capillary Constantmentioning

confidence: 99%

“…They were 998.21 kg/m 3 for water, 1795.1 kg/m 3 for Galwick, and 935.01 kg/m 3 for Silwick at 20 ºC. Liquids with distinctly different characteristics were selected to investigate the effect of the liquid on the capillary constant, as some theories claim the capillary constant to be dependent on the wetting liquid (Labuntcov and Yagov, 2007;Mayer, 2008;Richards and Carver, 1921;Kashin et al, 2011).In a typical experiment with the PMI equipment, air at a set flow rate is supplied to the sample chamber.…”

Section: Capillary Flow Porometrymentioning

confidence: 99%

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Assessment of the Pore Diameter Measured in Gas-Liquid Displacement Porometry: Effect of the Capillary Constant

Ängeslevä

Salmimies²,

Rideal³

et al. 2023

J Por Media

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Determining pore sizes of porous media accurately is essential for many reasons. The standard ASTM F316 describing calculations used in gas-liquid displacement (GLD) porometry includes a factor B or a capillary constant. The standard does not explain the nature of this factor and the reasons for using its value. This work aimed to investigate the capillary constant, to understand its meaning and applicability in calculating the pore diameter. Another goal was to assess the pore diameter measured in GLD porometry by comparing it with pore diameters measured with image analysis and cut point test methods. Seven filter media samples with as simple a structure as possible were analyzed. An investigation of the capillary constant revealed at least five different approaches, of which all are by no means applied for the calculations of pore size. Using the 2 approach described in standard ASTM F316 to adjust the values obtained by GLD porometry was found unsuitable for the simply structured samples studied in this work. This work showed that the pore diameters measured by GLD porometry were most comparable with the other studied techniques when using Silwick as the wetting liquid. The raw data of bubble point pore and mean flow pore diameters measured by GLD porometry were similar to the largest pore sizes and mean pore diameters measured by image analysis and cut point test methods. This, in turn, confirmed the absence of the need to use any constants for calculating the pore diameters for the samples studied in this work.

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Highly accurate liquid–liquid interfacial tension measurement by a convenient capillary apparatus

Ghatee

Ghazipour

2014

Fluid Phase Equilibria

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The capillary constant in calculating the surface tension of liquids

Cited by 3 publications

References 1 publication

FCS Analysis of Protein Mobility on Lipid Monolayers

FCS Analysis of Protein Mobility on Lipid Monolayers

Assessment of the Pore Diameter Measured in Gas-Liquid Displacement Porometry: Effect of the Capillary Constant

Highly accurate liquid–liquid interfacial tension measurement by a convenient capillary apparatus

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