Download or read book Spray-assembly of Polyelectrolyte and Polyelectrolyte/nanoparticle Films written by Zhiqiang Zheng and published by . This book was released on 2009 with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation Layer-by-Layer (LbL) polyelectrolyte and polyelectrolyte/ nanoparticle films were prepared using a number of different methods and were closely characterized. Firstly spray-assembled polyelectrolyte films were studied using Neutron Reflectivity and the results confirmed that stratified layers are formed. Thus, spray assembly of LbL-films is rapid and leads to high quality films. In addition, we studied the assembly of polyelectrolyte films by simultaneous spraying in collaboration with BASF AG.A second topic is the preparation of functional polyelectrolyte films using the example of spray-assembled lbL-films containing gold nanoparticles(Au NP). Compared to dip LbL deposition, spray assembly yielded Au NP multilayers in a fraction of the time. Additionally, it was found that with spray assembly the Au NP could be confined to individual horizontal strata without the need for additional treatment of the films as recently reported for a similar case1. It was also found that varying the sandwiched polymer layers controls the film's superposing roughness and thus the surface plasmon coupling between two adjacent Au NP layers.Thirdly, we established that even weak LbL-films can be mechanically protected by robust epoxy multilayers if the robust coating exceeds ≈10 nm in thickness.