14 - the Research Group of Angelika Kühnle
... the system may not be able to reach the equilibrium state but might be trapped in a kinetically limited state. The term selforganisation has been established for such kinetically limited systems [15•]. The difference between molecular self-assembly and self-organisation is illustrated in Fig. 1: To ...
... the system may not be able to reach the equilibrium state but might be trapped in a kinetically limited state. The term selforganisation has been established for such kinetically limited systems [15•]. The difference between molecular self-assembly and self-organisation is illustrated in Fig. 1: To ...
Sructural and chemisorption properties of metallic surfaces and metallic overlayers
... results for the Pd/Al system show that the Pd film grows on Al(IlO) in a layer-bylayer mode. The binding energies of the Pd 4d electrons for a very thin Pd film are very similar to th at for an atomic-like state. The film behaves as a free and unsupported overlayer. The Pd 4d states begin to evolve ...
... results for the Pd/Al system show that the Pd film grows on Al(IlO) in a layer-bylayer mode. The binding energies of the Pd 4d electrons for a very thin Pd film are very similar to th at for an atomic-like state. The film behaves as a free and unsupported overlayer. The Pd 4d states begin to evolve ...
Heterogeneous catalysis (I)
... site per unit time for a fixed set of reaction conditions (temperature, pressure or concentration, reactant ratio, extent of reaction). It is sometimes difficult to determine the number of active sites. For such situations, S is often replaced by the total, readily measurable, area A of the exposed ...
... site per unit time for a fixed set of reaction conditions (temperature, pressure or concentration, reactant ratio, extent of reaction). It is sometimes difficult to determine the number of active sites. For such situations, S is often replaced by the total, readily measurable, area A of the exposed ...
Investigation of the application of aerobot technology at Venus
... to detect surface temperature variations and convert them to altitude variations that can be then compared to the Magellan topography data in order to determine position of an aerobot relative to the surface. However, the imager will probably not detect altitude variations in the daylight, because a ...
... to detect surface temperature variations and convert them to altitude variations that can be then compared to the Magellan topography data in order to determine position of an aerobot relative to the surface. However, the imager will probably not detect altitude variations in the daylight, because a ...
Surface tension
Surface tension is the elastic tendency of liquids which makes them acquire the least surface area possible. Surface tension is an important property that markedly influences many ecosystems. Surface tension is responsible, for example, when an object or insect (e.g. water striders) that is denser than water is able to float or run along the water surface.At liquid-air interfaces, surface tension results from the greater attraction of water molecules to each other (due to cohesion) than to the molecules in the air (due to adhesion). The net effect is an inward force at its surface that causes water to behave as if its surface were covered with a stretched elastic membrane. Because of the relatively high attraction of water molecules for each other, water has a high surface tension (72.8 millinewtons per meter at 20 °C) compared to that of most other liquids. Surface tension is an important factor in the phenomenon of capillarity.Surface tension has the dimension of force per unit length, or of energy per unit area. The two are equivalent—but when referring to energy per unit of area, people use the term surface energy—which is a more general term in the sense that it applies also to solids and not just liquids.In materials science, surface tension is used for either surface stress or surface free energy.