title: Three-dimensional carbon nanotube scaffolds as particulate filters and catalyst support membranes.
abstract: Three-dimensional carbon nanotube scaffolds created using micromachined Si/SiO2 templates are used as nanoparticulate filters and support membranes for gas-phase heterogeneous catalysis. The filtering efficiency of better than 99% is shown for the scaffolds in filtering submicrometer particles from air. In the hydrogenation of propene to propane reaction low activation energy of E(a) approximately 27.8 +/- 0.6 kJ x mol(-1), a considerably high turnover rate of approximately 1.1 molecules x Pd site(-1) x s(-1) and durable activity for the reaction are observed with Pd decorated membranes. It is demonstrated that appropriate engineering of macroscopic-ordered nanotube architectures can lead to multifunctional applications.
authors.affiliation: Microelectronics and Materials Physics Laboratories, and EMPART Research Group of Infotech Oulu, Department of Electrical and Information Engineering, University of Oulu, P.O. Box 4500, FIN-90014 University of Oulu, Finland.
authors.forename: Niina
authors.initials: N
authors.lastname: Halonen
authors.forename: Aatto
authors.initials: A
authors.lastname: Rautio
authors.forename: Anne-Riikka
authors.initials: AR
authors.lastname: Leino
authors.forename: Teemu
authors.initials: T
authors.lastname: Kyllönen
authors.forename: Géza
authors.initials: G
authors.lastname: Tóth
authors.forename: Jyrki
authors.initials: J
authors.lastname: Lappalainen
authors.forename: Krisztián
authors.initials: K
authors.lastname: Kordás
authors.forename: Mika
authors.initials: M
authors.lastname: Huuhtanen
authors.forename: Riitta L
authors.initials: RL
authors.lastname: Keiski
authors.forename: András
authors.initials: A
authors.lastname: Sápi
authors.forename: Mária
authors.initials: M
authors.lastname: Szabó
authors.forename: Akos
authors.initials: A
authors.lastname: Kukovecz
authors.forename: Zoltán
authors.initials: Z
authors.lastname: Kónya
authors.forename: Imre
authors.initials: I
authors.lastname: Kiricsi
authors.forename: Pulickel M
authors.initials: PM
authors.lastname: Ajayan
authors.forename: Robert
authors.initials: R
authors.lastname: Vajtai