Journal ArticleDOI
Scattering optics of foam
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TLDR
The multiple scattering of light by aqueous foams is systematically studied as a function of wavelength, bubble size, and liquid fraction and the transport mean free path is found to be proportional to the bubble diameter and the reciprocal of the square root of liquid fraction.Abstract:
The multiple scattering of light by aqueous foams is systematically studied as a function of wavelength, bubble size, and liquid fraction. Results are analyzed in terms of the transport mean free path of the photons and an extrapolation length ratio for the diffuse photon concentration field. The wavelength dependence is minimal and may be attributed entirely to the wavelength dependence of the refractive index of water rather than thin-film interference effects. The transport mean free path is found to be proportional to the bubble diameter and the reciprocal of the square root of liquid fraction. The extrapolation length ratio varies almost linearly with liquid fraction between the values for water-glass-air and air-glass-air interfaces.read more
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Physical chemistry in foam drainage and coarsening
TL;DR: This review covers recent advances in the study of foam drainage and coarsening, focusing especially on the effective role of the foam chemical components on those aging processes, and summarizes how the surfactant, the liquid bulk properties, and the gas modify or not the drainage andCoarsening features.
Patent
Oleaginous pharmaceutical and cosmetic foam
TL;DR: In this paper, stable oleaginous cosmetic or therapeutic foam compositions containing certain active agents, having unique therapeutic properties and methods of treatment using such compositions, were proposed, which includes at least one solvent selected from a hydrophobic solvent, a silicone oil, an emollient, a co-solvent, and mixtures thereof, wherein the solvent is present at a concentration of about 70% to about 96.5% by weight of the total composition.
Journal ArticleDOI
On different ways of measuring “the” yield stress
TL;DR: In this article, the authors compare different methods of measuring the yield stress with conventional rheometers that have been used in the literature on a variety of materials and conclude that the differences between the various methods are significant.
Journal ArticleDOI
On the origin of the remarkable stability of aqueous foams stabilised by nanoparticles: link with microscopic surface properties
A. Cervantes Martinez,Emmanuelle Rio,G. Delon,Arnaud Saint-Jalmes,Dominique Langevin,Bernard P. Binks +5 more
TL;DR: Using earlier studies of planar particle monolayers, this work has correlated the interfacial properties and the macroscopic temporal evolution of the foam to shed light on the origin of the absence of coarsening of particle-stabilised foams.
Patent
Foamable vehicle and pharmaceutical compositions thereof
TL;DR: A hygroscopic pharmaceutical composition includes at least one hy-scopic substance at a concentration sufficient to provide an Aw value of at least 0.9 and an anti-infective agent as mentioned in this paper.
References
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Journal ArticleDOI
Spectroscopy and Imaging with Diffusing Light
Arjun G. Yodh,Britton Chance +1 more
TL;DR: Visually opaque media are ubiquitous in nature as mentioned in this paper, and light is transported through these materials in a process similar to heat diffusion, where a vanishingly small number of photons travel straight through such substances.
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A Generalized View of Foam Drainage: Experiment and Theory
TL;DR: In this paper, a new experimental method is presented using fluorescein dye to determine the spatial and temporal variations of the liquid volume fraction in aqueous foams This method was used for quantitative studies of liquid redistribution (drainage) in three types of experiments: forced, free, and pulsed drainage Characteristic quantities, such as the drainage velocity, show power-law dependences on experimental parameters that are inconsistent with traditional foam drainage models based on Poiseuille-type flow in the liquid-carrying channels (Plateau borders) of the foam.
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Diffusing-wave spectroscopy
TL;DR: The diffusing-wave spectroscopy (DWS) has become a particularly important quantitative tool in colloid physics because of its applicability to systems containing very high concentrations of scatterers, and its extreme sensitivity to small motions as mentioned in this paper.
Journal ArticleDOI
Multiple Light-Scattering Probes of Foam Structure and Dynamics
TL;DR: The structure and dynamics of three-dimensional foams are probed quantitatively by exploiting the strong multiple scattering of light that gives foams their familiar white color and identifies previously unrecognized internal dynamics of the foam bubbles.
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Scaling behavior in shaving cream
TL;DR: In this article, the coarsening of a three-dimensional foam is studied with multiple light-scattering techniques and scaling behavior is observed with the average bubble diameter growing in time as ${\mathit{t}}^{\mathit {z}}$ where z=0.45\ifmmode\pm\else\textpm\fi{}0.05.