21. Prof. Ulrike Diebold - Oxide Surfaces: Isolated Hydroxyls and Interaction with Water

Full title: Oxide surfaces: From isolated hydroxyls to the interaction with liquid water Speaker: Prof. Ulrike Diebold (TU Wien, Vienna, Austria) First Part: 00:00 - Introduction 02:00 - Beginning of the talk 10:49 - Hydroxyls and surface acidity 16:36 - Probing surface hydroxyls First Q&A: 30:28 - Q1: Role of proton tunneling 33:05 - Q2: Different oxygens on one surface 35:32 - Q3: Accuracy of DFT for surface science 39:10 - Q4: What determines adsorption strength 42:15 - Q5: Interaction between adsorbates (Frumkin isotherm) Second Part: 45:43 - Important remarks about real surfaces and DFT 54:15 - Evolution of oxide surfaces in liquid water Second Q&A: 1:09:16 - Q6: Experimental challenges 1:12:18 - Q7: Reasons for choosing rutile surfaces 1:15:09 - Q8: Differences in proton affinity between gas and water 1:21:51 - Q9: Driving force for surface changes in H2O 1:27:00 - Q10: STM of amorphous surfaces 1:28:42 - Q11: pH calculation of H2O under CO2 1:29:44 - Q12: Surface polarity 1:33:25 - Q13: pKa of the entire surface 1:35:23 - Q14: Future of the field https://www.electrochemicalcolloquium... #chemistry #education #physics Abstract:  Oxides play a major role in (photo-)electrochemistry and environmental applications, and have been investigated intensely with surface science techniques.  In the talk, I will first describe how we can probe the acidity if individual hydroxyls, and assess their proton affinity quantitatively with non-contact Atomic Force Microscopy in combination with DFT calculations.  I will then talk about our attempts to combine such UHV measurements with liquid water, and how we can possible contribute to probing fundamental properties of water itself.