Abstract
Between 0.1 and 2000 MHz, the ultrasonic attenuation spectrum has been measured for suspensions of polystyrene latex globules in water. Ionically stabilized and sterically stabilized samples have been studied at particle diameters between about 65 and 93 nm. The spectra exhibit uniform characteristics for both types of suspensions. In the upper part of the measuring range (υ > 30 MHz) the ultrasonic excess attenuation can be well represented by loss mechanisms associated with scattering, particularly those related to the monopole, dipole, and quadrupole oscillations of the latex globules. When compared to literature data at low frequencies, the values for the ultrasonic attenuation coefficient and for a Lame constant of the latex globules, as derived from the high-frequency part of the measuring range, indicate relaxation processes occurring in the material. These processes are reflected by the low-frequency part of the spectra and are attributed to rotational isomerization of small segments of polymer ch...
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
