Positioning Pd catalyst particles for carbon nanotube growth using charge patterns created with a scanning electron microscope

Positioning of charged nanoparticles with the help of charge patterns in an insulator substrate is a known method. However, the creation of charge patterns with a scanning electron microscope for this is relatively new. Here a scanning electron microscope is used for the creation of localized charge patterns in an insulator, while a glowing wire generator is used as the nanoparticle source. The deposited palladium nanoparticles are used as catalysts for the localized growth of carbon nanotubes in a chemical vapor deposition oven. The authors show first the results on local carbon nanotube growth using this procedure.IST/Imaging Science and TechnologyApplied Science

Risky Decision Making in Substance Dependent Adolescents with a Disruptive Behavior Disorder

Contains fulltext : 119578.pdf (publisher's version ) (Open Access)Of all psychiatric disorders, the disruptive behavior disorders (DBDs) are the most likely to predispose to substance dependence (SD). One possible underlying mechanism for this increased vulnerability is risky decision making. The aim of this study was to examine decision making in DBD adolescents with and without SD. Twenty-five DBD adolescents (19 males) with SD (DBD+SD), 28 DBD adolescents (23 males) without SD (DBD-SD) and 99 healthy controls (72 males) were included in the study. DBD adolescents with co-morbid attention deficit/ hyperactivity disorder (ADHD) were excluded. Risky decision making was investigated by assessing the number of disadvantageous choices in the Iowa gambling task. DBD+SD made significantly more risky choices than healthy controls and DBD-SD. Healthy controls and DBD-SD did not differ on risky decision making. These results suggest that risky decision making is a vulnerability factor for the development of SD in a subgroup of adolescents with DBD without ADHD

Comments on the cluster approach to chemisorption

Cluster size and shape effects on the chem. bonding of adsorbed mols. and atoms are reviewed. Electronic structural features that control coordination preferences and Pauli-repulsion as well as orbital symmetry effects that play an important role along with orbital symmetry effects are discussed in terms of symmetry adapted group orbitals. Examples are given for CO, NH3, and H2 adsorbed in Group VIII and IB metal clusters. About 30 ref