Studies of molecular properties at the surface of a liquid jet by second harmonic generation

✍ Scribed by Alonso Castro; Shaowei Ong; Kenneth B. Eisenthal

• Publisher: Elsevier Science
• Year: 1989
• Tongue: English
• Weight: 459 KB
• Volume: 163
• Category: Article
• ISSN: 0009-2614
• DOI: 10.1016/0009-2614(89)85159-0

✦ Synopsis

We report the use of second harmonic generation (SHG) to study kinetics of adsorption of p-nitrophenol at the air/water interface of a flowing jet. Measurements of the SH signal strength and the polarization of the SH light at various distances (times)

along the jet axis yield information about the development of the population density and orientation of nitrophenol at the air/ water interface. The kinetics of adsorption are consistent with the Langmuir theory. The free energy of adsorption obtained from the jet experiments was the same as that obtained from static experiments. The orientation of nitrophenol at the jet air/solution interface was the same as for the static (equilibrium) interface; orientational equilibrium is rapidly achieved.