Nano impact

EDX Energy-dispersive X-ray spectroscopy TEM Transmission Electron Microsoopry XRD X-ray Diffraction Nl Nanoindentations NIT Nano-Impact Test IT Impact Test ITMFS Impact Test with Modulated Force Signal BC Ball Cratering Test WLS White light scanning 3D measurements NT Inclined Impact Test S Scratch test NS Nano-scratch test RC Rockwell C OIF DiFfusion test OX Oxidation test TRM TRiboMeter... 

The samples were mounted on a standard NanoTest sample stub using superglue. They were cleaned with an Air Duster and thermally equilibrated in the NanoTest environmental cabinet before the nano-impact testing. Two different types of impact tests were set up (Table 1). 

In the context of nano-impact data such as that in Fig. 8.7a it is best expressed as a plot of the cumulative number of impacts as a function of time. This can then be compared with an integrated foim of the Shoup-Szabo expression. Fitting the latter to the former so as to determine C, the unknown concentration of nanoparticles, requires a knowledge of re (which can be found by independent electrochemical calibration) and D, the nanoparticle diffusion coefficient. Given the large size of the nanoparticles the latter can be reliably calculated from the Stokes-Einstein equation... 

Fig. 4—Profile of a cylindrical liquid jet containing deionized water or a slurry with nano-particles impacting on a surface of a silicon wafer with an incident angle 6 at a speed v. (L=100 mm, <1>=2 mm, 0=45°.)...

Chiral dendrimers are a class of compounds which offer the possibility to investigate the impact of chirality in macromolecular systems. Their specific properties are based on their well defined highly ordered structures with nano-scopic dimension (in this report we refer to dendrimers if the molecule has a core with at least three branches attached and a defined structure otherwise we will use the term dendritic compound). 

Section I reviews the new concepts and applications of nanotechnology for catalysis. Chapter 1 provides an overview on how nanotechnology impacts catalyst preparation with more control of active sites, phases, and environment of actives sites. The values of catalysis in advancing development of nanotechnology where catalysts are used to facilitate the production of carbon nanotubes, and catalytic reactions to provide the driving force for motions in nano-machines are also reviewed. Chapter 2 investigates the role of oxide support materials in modifying the electronic stmcture at the surface of a metal, and discusses how metal surface structure and properties influence the reactivity at molecular level. Chapter 3 describes a nanomotor driven by catalysis of chemical reactions. 

Characterization techniques continue to develop and will impact their application to zeolitic systems. Aberration corrected electron microscopes are now being used to improve our understanding of catalysts and other nano-materials and will do the same for zeolites. For example, individual Pt atoms dispersed on a catalyst support are now able to be imaged in the STEM mode [252]. The application of this technique for imaging the location of rare-earth or other high atomic number cations in a zeolite would be expected to follow. Combining this with tomography... 

At present a great variety of nano-objects, which have no analognes in natnre, are produced in large quantities. Their potential impact on the environment and... 

The Chinese have recently reported preparation and characterization of nano-NTO and the data indicate that it decomposes at a lower temperature and is less sensitive to impact stimuli [165] compared with micro-NTO. 

D. Li, H. Xia, J. Peng, M. Zhai, G. Wei, J. Li, and J. Qiao, Radiation preparation of nano-powdered styrene-butadiene rubber (SBR) and its toughening effect for polystyrene and high-impact polystyrene, Radiat. Phys. Chem., 76(11-12) 1732-1735, November-December 2007. 

---