Surface Charge of Aqueous Interfaces studied by Phase-Sensitive sum generations
Par Laetitia Dalstein, Institute of Physics, Academia Sinica, Taipei, Taiwan
Mercredi 29 Mai, 14h00, Salle des séminaires (215), 2ème étage, Bâtiment A4N
Abstract :
Water/air interface is one of the most significant platforms for many atmospheric and chemical processes in nature, and the reaction kinetics therein is unavoidably dictated by the surface pH.
During this talk, I will first present how phase-sensitive vibrational sum-frequency spectroscopy (PS-VSFS) technique1-2 can be used to quantitatively analyze the hydronium adsorption at the water/air surface3. Then, I will explain the newly developed phase-sensitive optical second harmonic generation (PS-SHG) method4 that allows direct determination of the absolute surface charge density and surface potential without need of any interfacial information.
1. Wen, Y.-C.; Zha, S.; Tian, C.; Shen, Y. R., Surface Ph and Ion Affinity at the Alcohol-Monolayer/Water Interface Studied by Sum-Frequency Spectroscopy. The Journal of Physical Chemistry C 2016, 120, 15224-15229.
2. Wen, Y.-C.; Zha, S.; Liu, X.; Yang, S.; Guo, P.; Shi, G.; Fang, H.; Shen, Y. R.; Tian, C., Unveiling Microscopic Structures of Charged Water Interfaces by Surface-Specific Vibrational Spectroscopy. Physical Review Letters 2016, 116, 016101.
3. Chiang, K.-Y.; Dalstein, L.; Wen, Y.-C., In preparation 2019.
4. Dalstein, L.; Chiang, K.-Y.; Shen, Y. R.; Wen, Y.-C., In preparation 2019.