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TLC Visualization Reagents
Always spray any of these reagents onto plates in a well ventilated hood while wearing safety glasses. Also apply moderate amounts to the plate so it always appears dull and flat (if it looks wet, you have sprayed too much). You can always overspray to enhance the detection.
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Ceramics: Sintering and Microstructure
www.epfl.chDuring this stage, the microstructure of the samples evolves (see Figure 1). Figure 1 Sintered Powder and microstructure. Source Krell et al.[8]. Pores, second phases and grain size have all an important influence on many of the final properties of ceramics. In general, the porosity has a more pronounced effect than a second phase or the grain ...
Perovskites: crystal structure, important compounds and ...
www.epfl.chThe Perovskite Bandgap can be tuned by Chemical Substitution The band gap can be tuned from 1.57 eV to 2.23 eV by substituting bromine for iodine in CH 3 NH 3 Pb(Br x I 1-x) 3 Noh et al., Nano Lett. 2013 For hybrid tandem with CIGS eV But the morphology is not stable!
§ 8 (suite) Equation de Nernst
www.epfl.chEquation de Nernst 191 192 Potentiel standard et équilibre Nous avons vu au chapitre 5 que l’enthalpie libre standard de réaction ΔG r 0 est reliée à la constante d’équilibre K de la réaction par : ΔG r 0 = – n F·ΔE0 ΔG r 0 = – RT· ln K Or, il a été établi dans ce chapitre que l’enthalpie libre standard de réaction est ...
Principe de superposition – Corrigé Exercice 1
www.epfl.chPrincipe de superposition – Corrigé Exercice 1 Le principe de superposition est une méthode qui permet, dans un circuit linéaire soumis à l’action de plusieurs sources indépendantes, de déterminer le courant résultant en un point quelconque du circuit ou encore la tension aux bornes de n’importe quel élément. En effet, il
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