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Politecnico di Torino
Academic Year 2007/08
01GXNGI
Surface Chemistry
Master of science-level of the Bologna process in Physical Engineering - Torino
Teacher Status SSD Les Ex Lab Tut Years teaching
Garrone Edoardo ORARIO RICEVIMENTO     4 0 0 0 6
SSD CFU Activities Area context
CHIM/02 4 C - Affini o integrative Cultura scientifica, umanistica, giuridica, economica, socio-politica
Syllabus
Introduction to the concept of surfaces. Relevance of surface chemistry in catalysis and sensing. Ideal and real surfaces. Phenomena of: adsorption, absorption, surface relaxation, surface reconstruction, compound formation.
Summary of Chemistry from the viewpoint of quantum mechanics. Periodic table, orbitals, codes for QM calculations, chemical concepts as descriptors of QM results.
Bonds: covalent homopolar, covalent heteropolar, dative; electronegativity, hybridisation. Crystalline systems: Miller indexes and compact crystal systems. Ionic crystals: Madelung model, Born-Haber cycle. Rare-gas crystals: interatomic potential of Buckingham and Lennard-Jones. Related surface re-laxation. Relaxation and reconstruction at extended metal surfaces: surface unit cells. Experimental methods for the study of metal surfaces: LEED, ATM, STM, Filed-emission microscope. Regular structures formed in the adsorption of molecules (CO).
Morphology of metal aggregates- nanoparticles.
Experimental methods for the study of real surfaces: elements of Infrared spectroscopy, Raman, NMR, EPR, UV-Vis. Seminar on Infrared spectroscopy. Study of a strongly ionic system (MgO): excitonic spectra and the existence of three species of surface oxygen. EPR spectra of surface superoxide species and surface Madelung constants.
The fractal approach to surfaces: self-similarity and fractal dimension.
Porous systems. Disordered: porous silicon. Ordered: zeolites. Controlled mesoporosity: silico-aluminas of the MCM-41 type.
Adsorption: physisorption and chemisorption. Activated complex. Localized and non-localized ad-sorption. Observables: isotherms, isobares, isochores. The two-dimenasional gas approach: Hil-de Boer equation. Localised sites: the Langmuir model. The silica isolated hydroxyl as ideal site. Structural heterogeneity: the local isotherm approach. Freundlich and Temkin equations. Calorimetry: heat of adsorption in the various cases. Induced heterogeneity: similarity with the Ising problem. Mean field approximation: the Fowler-Guggenheim equation. Comparison with the Onsager solution.
Vapour physisorption: BET model and the measurement of surface areas: link with the fractal model. Capillary condensation and hysterisis behaviour: Kelvin equation. Microporous systems: the Har-kins-Jura method.
Laboratory practice on: i) IR study of surfaces; ii) UV measurements; iii) BET measurements.

Programma definitivo per l'A.A.2008/09
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