Topic
Marangoni effect
About: Marangoni effect is a research topic. Over the lifetime, 5336 publications have been published within this topic receiving 98562 citations. The topic is also known as: Gibbs–Marangoni effect.
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25 Sep 1996
TL;DR: In this article, a new oscillating bubble method is used to measure surfactant mass transfer kinetics at liquid-gas interfaces, where a spherical bubble is formed, equilibrated, and oscillated radially with a small amplitude.
Abstract: A new oscillating bubble method is used to measure surfactant mass transfer kinetics at liquid–gas interfaces. A spherical bubble is formed, equilibrated, and oscillated radially with a small amplitude. The radial oscillations cause the gas-phase pressure to cycle about its equilibrium because of the periodic changes in bubble curvature and surface tension. The phase angle θ between the radial and the pressure oscillations and the amplitude ratio of these two quantities are measured as a function of forcing frequency ω′ and concentrationC′(0). These data are analyzed according to a linear analysis presented in part I of this research (J. Colloid Interface Sci.168,21, 1994) to find surfactant diffusivities and adsorption/desorption coefficients. The required input data are the equilibrium adsorption isotherm and the corresponding surface equation of state. For 1-decanol at the air–aqueous interface, equilibrium surface tension data are obtained by video-enhanced pendant bubble tensiometry and fitted to the generalized Frumkin model. The oscillating bubble method is then used to determine the mass transfer kinetics of 1-decanol. For ω′ ≤ 1 rad/s, the mass transfer is diffusion-controlled. Diffusivities found from the oscillating bubble data are in agreement with those obtained from pendant bubble relaxation data. For elevatedC′(0)and ω′ ≥ 1.0 rad/s, the mass transfer is controlled by both diffusion and the kinetics of adsorption–desorption. A mixed diffusion–kinetic model applied to these data yields a value for the desorption kinetic constant of α = 2.7 s−1. These results are consistent with the shift in controlling mechanism from pure diffusion control at dilute concentrations to mixed diffusion–kinetic control at elevated concentrations.
72 citations
TL;DR: This work uses light to generate Marangoni surface stresses resulting in flow patterns that accumulate particles at predefined positions that allow particles regardless of their size or surface properties to be patterned in model suspensions as well as in complex, real-world formulations such as commercial coffee.
Abstract: Controlled particle deposition on surfaces is crucial for both exploiting collective properties of particles and their integration into devices. Most available methods depend on intrinsic properties of either the substrate or the particles to be deposited making them difficult to apply to complex, naturally occurring or industrial formulations. Here we describe a new strategy to pattern particles from an evaporating drop, regardless of inherent particle characteristics and suspension composition. We use light to generate Marangoni surface stresses resulting in flow patterns that accumulate particles at predefined positions. Using projected images, we generate a broad variety of complex patterns, including multiple spots, lines and letters. Strikingly, this method, which we call evaporative optical Marangoni assembly (eOMA), allows us to pattern particles regardless of their size or surface properties, in model suspensions as well as in complex, real-world formulations such as commercial coffee.
72 citations
TL;DR: In this article, the influence of the velocity profile and temperature distribution for the present nanofluids was investigated under effect of the involved parameters, and the exact solutions of the resulted equations were solved using a new approach via Laplace transform.
72 citations
TL;DR: In this paper, an example of spreading driven by surface tension gradients is studied, i.e., the climbing of a film on a plane wall against gravity. And the authors present a theoretical and experimental study of the crossover between the film and the macroscopic reservoir.
Abstract: We study an example of spreading driven by surface tension gradients, i.e. the climbing of a film on a plane wall against gravity. We show which parameters control the thickness of the film. Moreover, we present a theoretical and experimental study of the crossover between the film and the macroscopic reservoir.
72 citations
TL;DR: In this article, the authors investigated thermocapillary instabilities on floating half zone convection in microgravity environment by linear instability analysis method and the critical Marangoni numbers were obtained and compared with the experimental ones.
72 citations