We present a hands-on activity designed for advanced physical chemistry courses for Master’s students on the application of photocatalysis to the modification of the surface properties of a semiconductor (titanium dioxide). The wetting properties of TiO2 films, deposited from commercial powders, are studied before and after UV irradiation. Irradiation-induced superhydrophilicity is exploited to provide antifogging properties. The TiO2 films are then functionalized with a perfluorinated alkylsilane to impart superhydrophobicity and subsequently lithographed by irradiation through a photomask: the photocatalytic degradation of the organic chains in the irradiated areas leads to a wetting contrast that can be revealed using dye solutions. This experience can be easily adapted to be suited for undergraduates or high-school students as well as to demonstrations for science festivals.
Wetting Modification by Photocatalysis: A Hands-on Activity To Demonstrate Photoactivated Reactions at Semiconductor Surfaces / L. Rimoldi, T.T.A. Taroni, D. Meroni. - In: JOURNAL OF CHEMICAL EDUCATION. - ISSN 0021-9584. - 95:12(2018 Dec 11), pp. 2216-2221.
|Titolo:||Wetting Modification by Photocatalysis: A Hands-on Activity To Demonstrate Photoactivated Reactions at Semiconductor Surfaces|
RIMOLDI, LUCA (Primo)
TARONI, TOMMASO TANCREDI ALESSANDRO (Secondo)
MERONI, DANIELA (Ultimo)
|Parole Chiave:||Physical Chemistry; Surface Science; Materials Science; Photochemistry; Hands-On Learning/Manipulatives; High School/Introductory Chemistry; First-Year Undergraduate/General; Upper-Division Undergraduate|
|Settore Scientifico Disciplinare:||Settore CHIM/02 - Chimica Fisica|
|Data di pubblicazione:||11-dic-2018|
|Data ahead of print / Data di stampa:||set-2018|
|Digital Object Identifier (DOI):||http://dx.doi.org/10.1021/acs.jchemed.8b00362|
|Appare nelle tipologie:||01 - Articolo su periodico|