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Chapter 9 Adsorption

1 Chapter 9 Adsorption Introduction Adsorption : (i) the principle ways in which high-energy interfaces lower the overall energy of a system. (ii) A complex process which is different to be described precisely by theoretical model. Definition of Adsorption : Preferential concentration of one component of a system at an interface, where the local concentration is different from those in the bulk phase. (i) positive Adsorption : interfacial concentration of the adsorbed species is greater than that in the bulk phase. - decrease the interfacial energy. (ii) negative Adsorption : increase the interfacial energy of a system. Two aspects that can be addressed in consideration of Adsorption process : (i) Thermodynamics concerns the final equilibrium interfacial energy.

adsorption onto solid surfaces must include knowledge of “historical” elements. Method for a material to reduce surface energy Liquid: reducing the interfacial area (from spherical drop) Solid: adsorbing materials - heterogeneous in the distribution of excess surface energy, so, the adsorption is not a uniform process.

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