PE-CVD of acid/base coatings from Acrylic Acid and Allylamine vapors

Different plasma processes were investigated to obtain coatings characterized by N- and O-functional groups at their surface. From the literature, big efforts are evident devoted to designing new surfaces with chemical composition and chemical-physical properties tightly controlled. This paper demonstrates how it is possible to obtain coatings with acid and basic properties at different extent, by simply adjusting the acrylic acid/allylamine chemical composition of the gas feed in a plasma deposition process. The deposited films exhibit tuneable acid-base properties, very attractive to manufacture sensors, and biomaterials, and for applications in tissue engineering field

One step plasma deposition of platinum containing nanocomposite coatings

View at Publisher| Export | Download | Add to List | More... Plasma Processes and Polymers Volume 7, Issue 1, 14 January 2010, Pages 51-58 One-step plasma deposition of platinum containing nanocomposite coatings (Article) Dilonardo, E.a, Milella, A.ab, Palumbo, F.b , Capitani, G.c, D'Agostino, R.ab, Fracassi, F.ab a Department of Chemistry, University of Bari, Via E. Orabona 4, 70126 Bari, Italy b Institute for Inorganic Methodologies and Plasmas (IMIP)-CNR, Italy c Department of Geological and Geo-technological Sciences, Università degli Studi di Milano Bicocca, P.za della Scienza 4, 20126 Milano, Italy View additional affiliations View references (50) Abstract In this paper a single step process for the synthesis of composite thin films made of platinum nanoclusters embedded in a porous hydrocarbon matrix is proposed. The process consists of a simultaneous plasma enhanced-chemical vapour deposition of ethylene and sputtering of a platinum target. Films were characterized by means of Fourier transform-infrared spectroscopy, X-ray photoelectron spectroscopy, atomic force microscopy, scanning electron microscopy and transmission electron microscopy. Optical emission spectroscopy was used to investigate the plasma phase and to find correlations with the metal content of the film. The effect of radio frequency power, deposition time, and ethylene flow rate on the chemical composition and structure of the film is presented. Results show that the platinum content in the film can be controlled by tuning the power delivered to the plasma and the monomer flow rate, and that the metal aggregates in crystalline nanoclusters uniformly distributed in the material. Film morphology is characterized by columnar structures of variable diameter and orientation depending on the deposition conditions

CFD take-off analysis of a seaplane hull through a dynamic multiphase model

Nowadays, marine economy shows a renewed interest in seaplanes thanks to their multiplex usage. Hull geometries remains almost the same since the third decade of the last century, when models such S55-X appeared. The main progress has consisted in a step behind the forebody on the lower surface of the hull, to decrease roughly the hydrodynamic drag in order to make a rapid take-off. Thus, the analysis provides the fluid dynamic behaviour in the take-off flight configuration of one of the twin hulls of the seaplane SavoiaMarchetti S55-X model aircraft built by the student team "Team S55". The study aims showing the analytical method useful to evaluate the velocity field, the pressure field, the trust and the drag coefficient changes on a hull initially at rest reaching the take-off velocity. The analytical results are compared with experimental data collected by NASA through the S55-X tank registered in the Technical Note no.635