Nanoparticles, the buildfing blocksNanoparticles are the building blocks or basis units in Nanotechnology. They usually are very small, on the order of nanometers. However, zillions of these connected in smal way form very useful materials Each week, the US Patents and over 300 journals are scanning for items on nanotechnology applications. The latest findings are listed by week and type, patent or journal artivcle.. To see the weekly list, click on:
Nanoparticles Current Awareness Nanoparticles Topics Large FullerenesDuring the arc discharge technique large fullerenes are formed from 650 to 3500 amu, 50 to 300 carbon atomes.. Large fullerenes are difficult to handle because of their size. Mukherjee et al found that by attaching dodecyl groups to the fullerenes, the clusters become soluble and can be manipulated. These dodecylated fullerenes are soluble in chloroform to 15.7 g/L. “The dodecylated large fullerenes have distinctly different behavior than regular organic molecules in dipolar dephasing, magic angle spinning nuclear magnetic resonance (13C MAS NMR) experiments.”” There is 1 dodecyl group for every 23 sp2 fullerene carbon atoms, that the quaternary aliphatic carbons generated upon dodecylation give signals considerably more shielded than those in alkylated C60 and C70 but similar to the quaternary aliphatic signals in dodecylated single-walled carbon nanotubes.””The dodecyl groups in the dodecylated large fullerenes exhibit widely varying degrees of motional freedom.” Arnab Mukherjee, Lawrence B. Alemany, Jayanta Chattopadhyay, Soma Chakraborty, Wenhua Guo, Sandy M. Yates, and W. E. Billups* Department of Chemistry and The Richard E. Smalley Institute for Nanoscale Science and Technology, Rice University
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