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Surface tension
About: Surface tension is a research topic. Over the lifetime, 25410 publications have been published within this topic receiving 695471 citations.
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TL;DR: In this article, an improved analytic approach was proposed to estimate the surface tension forces acting along the contact line to the total adhesion force, which was deliberately omitted in the above cited work.
Abstract: Particle−surface interactions due to capillary effects between spherical, paraboloidal, and conical particles and a flat substrate are considered. A recent approach given in a previous issue of Langmuir (Marmur, A. Langmuir 1993, 9, 1922) to obtain analytical estimates of the resulting capillary forces is discussed. Because Marmur's analytic approximation includes unnecessary simplifications, an improved formula for the approximation is given. Furthermore, the contribution of the surface tension forces acting along the contact line to the total adhesion force, which was deliberately omitted in the above cited work, is shown to be, in some cases, of similar order of magnitude as the capillary forces or even to exceed the latter. The range of applicability of the improved approach is verified by comparison with numerical solutions of the capillary equation for the liquid thread joining particle and substrate. The improved analytic approach is shown to be within ±5% of the exact solution for spherical and pa...
132 citations
TL;DR: In this article, it is shown that the deformation of single hemp fibres can be monitored by following the peak shift of the 1095 cm−1 Raman band with respect to strain and stress.
132 citations
01 Apr 1995
TL;DR: In this paper, surface tension of 19 kinds of colloidal spheres of monodispersed polystyrene and silica (6-460 nm in diameter) in crystal-like, liquid-like and gas-like suspensions are studied systematically at the air-water interface by the Wilhelmy method.
Abstract: Surface tensions, γ, of 19 kinds of colloidal spheres of monodispersed polystyrene and silica (6-460 nm in diameter) in crystal-like, liquid-like, and gas-like suspensions are studied systematically at the air-water interface by the Wilhelmy method. γ-values of the aqueous suspensions of colloidal silica spheres are close to that of pure water, though very weak surface activity [maximum in Δγ (surface tension of suspension minus that of water) is ca. -2 mN/m only] is detected for silica spheres of diameters ranging from 100 to 200 nm. The surface activity of polystyrene spheres, on the other hand, is high especially for spheres of diameters between 100 and 200 nm. The maximum in - Δγ is ca. 20 mN/m. The large difference in the surface activity between the two kinds of spheres is due to the difference in surface characters, i.e., highly polar and strongly hydrophobic for silica and polystyrene spheres, respectively. Furthermore, surface tension lowering of the crystal-like suspensions is substantial when compared with that of the liquid-like or gas-like suspensions. It is highly plausible that the intersphere distance in the two-dimensional colloidal crystals at the interface is shorter compared with that in the bulk phase by the shortened electrical double layers at the interface.
132 citations
TL;DR: The physico-chemical aspects of the interaction between the membrane and mammalian cells in order to provide guidelines to the selection of cytocompatible membranes are investigated and it is observed that cell adhesion increased with increasing base parameter of membrane surface tension.
132 citations
TL;DR: The first application of surface SHG measurements to the study of an electrochemical liquid-liquid interface was reported in this article, where Resonant SHG measurement was used to monitor the adsorption of the surfactant molecule 2-(n-octadecylamino)naphthalene-6-sulfonate (ONS) at a water/ 1,2-dichloroethane interface.
Abstract: oo22-36~~/~~/209 ~-04a~~o~oo/o optical response time, and theability toeasilydiscriminatebetween surface species and species in the adjacent buIk media, SHG has been employed extensively at a wide variety of surfaces10J)-M In this paper we report the first application of surface SHG measurements to the study of an electrochemical liquid-liquid interface Resonant SHG measurements are used to monitor the adsorption of the surfactant molecule 2-(n-octadecylamino)naphthalene-6-sulfonate (ONS) at a water/ 1 ,2-dichloroethane interface The relative surface coverage of the anionic surfactant molecule as a function of applied potential is determined from the surface SHG signal The results of these SHG experiments are used to provide new information complementary to that obtained from measurements of the interfacial tension of the ITIES At a pH of 9, anionic ONS adsorption is found to mr at all potentials positive of the potential of zero charge (pzc) The adsorption of ONS can be described by a Frumkin isotherm with a free energy of adsorption that increases with the applied potential and with the surface coverage of ONS At a pH of 3, the combination of SHG and interfacial tension measurements is used todetermine that both the anionic and the zwitterionic forms of ONS are present at the water-dichloroethane interface At potentialsverypositiveofthepzc, theanionicONSat theinterface undergoes a field-dependent protonation of its amino group to form the zwitterion
132 citations