Vol. 12, Special Issue, October 2011, pp.66-70

Abstract: The temperature dependencies of ultrasonic velocity and attenuation were measured in pure polyurea elastomer and doped with inorganic MoS₂ nanotubes. Below room temperature the large ultrasonic relaxational attenuation maxima and velocity dispersion were observed. It was found that the attenuation peak in elastomer shifted to lower temperature after doping with nanotubes. The ultrasonic attenuation data were fitted to relaxation equation with temperature dependent relaxation time. The thermal activation energy of relaxation process, which was calculated from ultrasonic data, was found to increase in polyurea elastomer doped with MoS₂ nanotubes. The low temperature ultrasonic velocity increases in polymer with nanotubes and it is determined by the increase of elastic modulus.

Keywords: Ultrasonic attenuation, Ultrasonic velocity, Elastomer composite with inorganic nanotubes, Thermal activation energy

Click <here> or title of paper to download the full pages article (662 kb)

Read more about Nanosensors

1999 - 2011 Copyright ©, International Frequency Sensor Association (IFSA). All Rights Reserved.

Home - News - Links - Archives - Tools - Standardization - Patents - Marketplace - Projects - Wish List - Subscribe - Membership - IFSA Publishing - Submit Press Release - Twitter - Search

 Members Area -Sensors Portal - Voltage-to-Frequency Converters - Training Courses - S&T Digest - For advertisers - Bookstore - Forums - Polls - Sensor Jobs - e-Shop - Site Map - Video