Results 311 to 320 of about 227,210 (363)
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Langmuir, 2010
Because of their layered structure, thermotropic smectic mesogens can form stable foams. In this study, two-dimensional foams of 8CB are prepared in the smectic A phase. We determine the structures of the foam cells and study the aging dynamics. Three stages of foam evolution are distinguished. The freshly prepared foam consists of multilayers of small
Torsten, Trittel +2 more
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Because of their layered structure, thermotropic smectic mesogens can form stable foams. In this study, two-dimensional foams of 8CB are prepared in the smectic A phase. We determine the structures of the foam cells and study the aging dynamics. Three stages of foam evolution are distinguished. The freshly prepared foam consists of multilayers of small
Torsten, Trittel +2 more
openaire +2 more sources
Foam-in-Foam Polyurethane Composite
Journal of Cellular Plastics, 2002Open-pore flexible polyurethane (PUR)foams with various pore sizes (1–8 mm)were used as 3-D filler to reinforce low-density, closed-cell PUR flexible foam. The final composite has a “foam-in-foam” structure. Compared to the unfilled PUR flexible foam, the composite exhibits considerable improvement on mechanical properties: with the same density, the ...
Y. Yuan, F. Shutov
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Journal of Non-Equilibrium Thermodynamics, 2001
zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Han, G. B. +4 more
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zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Han, G. B. +4 more
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Monodisperse liquid foams via membrane foaming
Journal of Colloid and Interface Science, 2020It is possible to generate fairly monodisperse liquid foams by a dispersion cell, which was originally designed for the generation of fairly monodisperse emulsions. If this is the case, scaling-up the production of monodisperse liquid and solid foams will be no longer a problem.We used the dispersion cell - a batch process - and examined the influence ...
Laura Carballido +4 more
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Flow in Foams and Flowing Foams
Annual Review of Fluid Mechanics, 2013Aqueous foams are complex fluids composed of gas bubbles tightly packed in a surfactant solution. Even though they generally consist only of Newtonian fluids, foam flow obeys nonlinear laws. This can result from nonaffine deformations of the disordered bubble packing as well as from a coupling between the surface flow in the surfactant monolayers and ...
Pitois, Olivier +2 more
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Phlebology: The Journal of Venous Disease, 2015
Foam sclerotherapy is a minimally invasive treatment for lower limb varicose veins. Current evidence indicates that its efficacy may not be as high as surgery or endovenous ablation. The minimally invasive nature of the treatment however means that it has a wide application, and it can be particularly useful in patients who are not suitable for other ...
Glen, Alder, Tim, Lees
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Foam sclerotherapy is a minimally invasive treatment for lower limb varicose veins. Current evidence indicates that its efficacy may not be as high as surgery or endovenous ablation. The minimally invasive nature of the treatment however means that it has a wide application, and it can be particularly useful in patients who are not suitable for other ...
Glen, Alder, Tim, Lees
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Study on Foaming Agent Foam Ability and Stability for Foam Concrete
Applied Mechanics and Materials, 2013Foam ability and stability of foaming agent are key factors for foam concrete properties. Through researching LAS, SDS and magnesite foaming agent commercially available, the results show that adding HPMC after can reduce LAS, SDS and magnesite foam bleeding quantity and subsidence distance and has little impact on foam expansion, magnesite foam ...
Su Fen Dong, Wei Zhang
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Materials Characterization, 1972
Abstract The shape, distribution, arrangement, and stability of cells in a typical foam and polycrystal are compared, and their observed dissimilarity is attributed to a fundamental difference in the structure of the two systems. In particular, it is shown that certain features of a polycrystal may be accounted for, if the surface of its grains is ...
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Abstract The shape, distribution, arrangement, and stability of cells in a typical foam and polycrystal are compared, and their observed dissimilarity is attributed to a fundamental difference in the structure of the two systems. In particular, it is shown that certain features of a polycrystal may be accounted for, if the surface of its grains is ...
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Rheology of foams: I. Theory for dry foams
Journal of Non-Newtonian Fluid Mechanics, 1986A two-dimensional model for foams having gas volume fraction approaching unity has been developed. A general expression for the stress tensor is obtained which gives the total stress in terms of the shape of the cells, interfacial tension, the initial cell orientation, and the rate of deformation in the liquid.
Khan, S. A., Armstrong, R. C.
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Endeavour, 1985
Abstract This article reviews the general properties of liquid and solid foams; the principles underlying their preparation and stability; and the ways in which they can be broken down. It then goes on to consider how foams can be used in pharmacy; for example, to extend the period of absorption of drugs. It also discusses the use of foam flotation —
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Abstract This article reviews the general properties of liquid and solid foams; the principles underlying their preparation and stability; and the ways in which they can be broken down. It then goes on to consider how foams can be used in pharmacy; for example, to extend the period of absorption of drugs. It also discusses the use of foam flotation —
openaire +2 more sources