Dispersion of Single Walled Carbon Nanotubes Using a Novel Type of Sonication: Focused Sonication.

We demonstrate the use of novel type of sonication method, focused sonication, with added advantages over bath and probe type of sonication for the dispersion of single walled carbon nanotubes (SWNT). Di-chloro benzene was used as the solvent for dispersion of SWNT. Results from focused sonication and bath sonication were compared and found that focused sonication results in better dispersion.

Micro-indentation fracture behavior of human enamel.

Objective: The purpose of this study was to determine the crack resistance behavior (K(R)) of human enamel in relation to its microstructure.

Methods: Human molar teeth were precision cut, polished and tested using Vickers micro-indentation at different loads ranging from 0.98 to 9.