Drop and Bubble Shape Analysis as a Tool For Dilational Rheological Studies of Interfacial Layers

Loglio, G.; Pandolfini, P.; Miller, R.; Makievski, A. V.; Ravera, Francesca; Ferrari, Michele; Liggieri, Libero

doi:10.1016/s1383-7303(01)80038-7

Cited by 144 publications

(114 citation statements)

References 49 publications

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“…The measurement was based on the axial symmetric drop shape analysis 102 . Briefly, a drop of the sample was generated at the capillary tip of the tensiometer.…”

Section: 11)mentioning

confidence: 99%

Surface tension prevails over solute effect in organic-influenced cloud droplet activation

Ovadnevaitė

Zuend

Laaksonen

et al. 2017

Nature

270

373

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“…The measurement was based on the axial symmetric drop shape analysis 102 . Briefly, a drop of the sample was generated at the capillary tip of the tensiometer.…”

Section: 11)mentioning

confidence: 99%

Surface tension prevails over solute effect in organic-influenced cloud droplet activation

Ovadnevaitė

Zuend

Laaksonen

et al. 2017

Nature

270

373

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“…The method of measurement is described in [31]. A schematic drawing of the tensiometer seen from above is presented in Fig.…”

Section: Surface Rheology Measurementsmentioning

confidence: 99%

“…Here, monolayer compression and expansion is more homogeneously distributed over the whole area than on a Langmuir trough. ADSA was used to study DPPC [4,21,30] and other phospholipid monolayers at the air-water interface [3,4,21,30,31], chloroform/water interface [21,22,30], n-dodecane/water interface [23,30] or dichloromethane/water interface [32]. Alternatively to a pendent drop, PAT can also be used to study a captive bubble under prescribed oscillations.…”

Section: Introductionmentioning

confidence: 99%

Surface rheology of monolayers of phospholipids and cholesterol measured with axisymmetric drop shape analysis

Vrânceanu

Winkler

Nirschl

et al. 2007

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Surface rheology of monolayers of a saturated phospholipid (dipalmitoylphosphatidylcholine, DPPC), an unsaturated phospholipid (dioleoylphosphatidylcholine, DOPC) and cholesterol is studied with axisymmetric drop shape analysis at the argon/water interface. Measurement techniques for lipids are described in detail. Profile analysis tensiometry (PAT) is used to determine the film pressure Π, surface elasticity and surface dilational viscosity of monolayers upon sinusoidal oscillations of the drop surface for various amplitudes a and frequencies f to assess their dependence on these dynamic parameters. It is shown that surface dilational viscosity strongly depends on the frequency and decreases by a factor 2-5 with increasing f in the considered range. Dilational viscosity is higher the more the monolayer approaches a relaxed state. Thus, the molecular interactions are stronger in the relaxed than in the stressed state. Surface elasticity is much less dependent on dynamic conditions. For DPPC a minimum of the dynamic surface elasticity is found for f = 12.5 mHz (at Π = 17.5 mN m −1 ) which coincides well with the relaxation frequencies measured in stress relaxation experiments. The dynamic surface elasticity of DPPC exhibits a plateau in the range 13.5 mN m −1 ≤ Π ≤ 27 mN m −1 in good coincidence with the phase boundaries of the coexistence region of micron-sized liquid crystalline domains surrounded by a fluid monolayer phase. In equilibrium measurements (Π/A-isotherms) a plateau of the film pressure is seen at the lower bound and a break at the upper bound of the coexistence region. Film pressure/area isotherms produced by PAT and a Langmuir film balance closely coincide as is shown in a comparison to literature values. However, the surface elasticities measured dynamically with oscillating surfaces widely deviate from those derived from isotherms in the case of DPPC and cholesterol, whereas for DOPC very good agreement can be found.

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“…The first of these methods is the drop profile analysis tensiometer, which is used to measure surface tension by analyzing the shape of a droplet (bubble) [70][71][72], which can be operated in the low-frequency range from 10 -3 to 0.2 Hz. The second device is the capillary pressure tensiometer, which is used to directly measure capillary pressure [73] at higher frequencies of 0.1-100 Hz (in some cases, up to 500 Hz).…”

Section: Methods Based On the Oscillationmentioning

confidence: 99%

Methods of measuring rheological properties of interfacial layers (Experimental methods of 2D rheology)

2009

Self Cite

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-Current methods of studying the rheological properties of interfacial layers at the interfaces of fluids are reviewed. This area of research includes two-dimensional 2D rheology. Regardless of the similarities between the parameters of rheological properties of two-dimensional and bulk (three-dimensional) systems, when measuring surface properties, it is necessary to reformulate the main experimental methods to allow for the different dimensions of surface and bulk characteristics of material. Parameters of shear and dilational (measured upon expansion-compression) properties of interfacial layers are distinguished, and the latter are considered to be independent parameters of a system. The most attention was given to the rotational methods of measuring shear viscosity and the components of the complex 2D elastic modulus, as well as to measuring surface tension upon harmonic changes of the bubble (droplet) surface area, which allows characteristics of the dilational behavior of thin liquid films to be determined. Both groups of methods are widely used in laboratory practice and realized in the form of a number of original and commercial instruments. Dilational measurements of interfacial layers can also be performed with oscillations of a movable barrier on a Langmuir trough. In addition, methods based on the propagation of capillary waves across the surface of a liquid, as well as rarer methods of capillary flow in thin channels forced by either a surface tension gradient or the motion of the interface, are considered.

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Drop and Bubble Shape Analysis as a Tool For Dilational Rheological Studies of Interfacial Layers

Cited by 144 publications

References 49 publications

Surface tension prevails over solute effect in organic-influenced cloud droplet activation

Surface tension prevails over solute effect in organic-influenced cloud droplet activation

Surface rheology of monolayers of phospholipids and cholesterol measured with axisymmetric drop shape analysis

Methods of measuring rheological properties of interfacial layers (Experimental methods of 2D rheology)

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