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Thermodynamics of Surfaces; Equilibrium Crystal Shape. Course will primarily focus on: atomic structure and electronic properties, chemical composition and adsorption properties of surfaces.
10 wrz 2020 · However, from the point of view of thermodynamics, it is easier to think of surface energy. How much work is needed to increase the surface area? And how is this related to what we have described as “surface tension”?
Gibbs considered the conditions in an isothermal and isobaric system of more than one component, such as a solution, where specific components might change the number of moles. To this aim, three main parameters should be defined: the Gibbs surface free energy G
It is tied to the force needed to stretch a surface. It is sometimes called (mostly for solids) surface energy and defined as the work that is required to build a unit area of a particular surface. The units of surface tension are free energy per unit area, [J/m2] or force per unit length, [N/m].
The surface (free) energy ɛ is the energy necessary to produce unit area of new surface from bulk material by increasing the number of surface atoms. This may, e.g., happen by deforming a spherical cluster (with minimum surface area) to some flat, spheroidal shape or wire (with larger surface area).
The surface free energy is energy resulting from the “dangling bonds” exposed at material's surface (Kaczmarek et al., 2018). The addition of tannic acid increases the surface free energy and polar component of the surface.
\( \gamma \) is the increment of Gibbs free energy with the increasing of surface area per unit square at CTCP, called specific surface free energy (SSFE), and it is also called surface free energy (SFE).
