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Соболева, О. А.; Summ, B. D.

doi:10.1023/a:1013236323086

Cited by 4 publications

(7 citation statements)

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“…18 A few experimental and theoretical studies of spreading drops have shown, however, that an inertial regime exists ahead of the viscous regime. [19][20][21] This early stage of spreading lasts only a few milliseconds and, for completely wetting surfaces, it is as well described by a power law. The exponent of the power law is as high as 1/2.…”

Section: Introductionmentioning

confidence: 99%

Short time wetting dynamics on soft surfaces

2011

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The wetting of solid surfaces by fluids has been studied for more than two centuries. However, it was only in recent years that investigations of the first milliseconds of spontaneous drop spreading on solid surfaces started. For non-deformable surfaces, this fast dynamic wetting process is known to be dominated by inertia and controlled by surface wettability. In this work we studied spontaneous spreading of liquids on soft, viscoelastic rubber films with shear moduli |G| between 0.2 and 510 kPa and thickness d between 30 and 160 mm. We found that the early stage of fast wetting of soft surfaces is also dominated by inertia and that the wetting dynamics follows a power law which mainly depends on wettability, but not on softness. This finding allows us to apply fast dynamic wetting measurements for inferring the equilibrium contact angle q eq on soft surfaces. On such surfaces static contact angle measurements with sessile drops would not yield univocal results and Young's equation is not directly applicable. On the other hand, the duration of the fast inertial wetting is controlled by surface softness. This is an indication of a viscoelastic dissipation process occurring during wetting that starts after some characteristic time dependent on the surface tension of the liquid, on the viscosity of the surface, and on the speed of wetting.

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Section: Introductionmentioning

confidence: 99%

Short time wetting dynamics on soft surfaces

2011

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“…The incorporation of tritium label into surfactant molecules was performed by the thermal activation of tritium [23]. We used nonionic surfactant TritonX-100 ( 3 H-TX-100) and cationic surfactants cetyltrimethy-lammonium bromide ( 3 H-CTAB) and cetylpyridinium chloride ( 3 H-CPC) labeled by tritium.…”

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Autoradiography studies of the processes of wetting and spreading

Должикова¹,

Bogdanova²,

Summ³

et al. 2005

Colloid J

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“…The incorporation of tritium label into surfactant molecules was performed by the thermal activation of tritium [23]. We used nonionic surfactant TritonX-100 ( 3 H-TX-100) and cationic surfactants cetyltrimethylammonium bromide ( 3 H-CTAB) and cetylpyridinium chloride ( 3 H-CPC) labeled by tritium.…”

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confidence: 99%

“…To obtain autoradiograms, we used Retina-XBM X-ray films with a sensitivity of 1600 R -1 . At such a sensitivity, the degree of blackening convenient for the visual analysis of autoradiograms is achieved when no less than 10 6 β -particles hit 1 cm 2 of film surface [23].…”

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confidence: 99%

“…When studying the wetting and modification of Teflon and glass surfaces by aqueous 3 H-CTAB solutions, it was disclosed that surfactant is accumulated at the three-phase contact line [23]. It was demonstrated by autoradiography technique [21] that 3 H-CTAB is completely removed from the surfaces of polymers (Teflon, polyethylene, polypropylene) upon rinsing in water, but strongly adheres to the glass surface.…”

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Autoradiography studies of the processes of wetting and spreading

et al. 2005

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Wetting and spreading of liquids over solid surfaces are the important stages of many natural and technological processes. Systematic studies in this branch of research covering the diversity of systems with various types of interaction between the liquid and the solid are performed, using direct methods based either on measuring the contact angles or the observation of the movement of wetting perimeter [1][2][3][4]. In modern units, computer-aided processing of the images of droplet or liquid front is performed [5]. Indirect methods such as the rupture of liquid "bridges" [6,7] and capillary rise method [1,8] are used, along with direct methods. In the case of well-wetting liquids, small contact angles on solid surface are measured by studying the light interference in thin menisci near the three-phase contact line (TPCL) [9][10][11].In general, these methods are sufficient to study the regularities of wetting and spreading, if the processes of interaction between the liquid and the solid are of no significance. However, in many cases, the diffusion, the mutual dissolution of liquid and substrate, and chemical reactions greatly affect the statics and dynamics of wetting [1,2]. To analyze the propagation of liquid front limited by physicochemical processes, one needs information on the distribution of substance within the bounds of wetted area, for example, between the grain body and grain boundaries, as well as on the TPLC structure.When discussing the wetting of various solids by surfactant solutions, it is also important to know the surfactant distribution on the solid surface, in particular, near the TPLC.Considerable opportunities to solve such tasks are provided by the tracer technique in combination with autoradiography. The aim of this work is to report results of studying the wetting and spreading processes by autoradiography.The autoradiography is a photographic method of the detection of ionizing radiation of radionuclide preliminarily added to the studied substance [12].Convenient for analysis photographic image (autoradiogram) is formed when a certain radiation dose hits the unit surface area of a photodetector.Autoradiograms are taken upon the direct contact between the studied surface and the detector. Then, they are analyzed visually, photometric measurements are performed, and the electron scanning of negative image or photograph is made. Photometric curves presenting the dependences of the degree of autoradiogram blackening on the labelled substance concentration make it possible to quantitatively estimate the substance distribution over the spreading area of liquid phase. The amount of the substance is proportional to the intensity of autoradiogram blackening. At present, there is a software package that allows one to digitally analyze the autoradiograms [13], thus broadening the method's possibilities. One can determine not only the distribution of liquid phase over the solid surface but also the adsorption of surfactants or impurities on this surface, study the kinetics of formation and the s...

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Cited by 4 publications

References 10 publications

Short time wetting dynamics on soft surfaces

Short time wetting dynamics on soft surfaces

Autoradiography studies of the processes of wetting and spreading

Autoradiography studies of the processes of wetting and spreading

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