An ultrasonic characterization of ferrofluid

• Published in: Ultrasonics 2009-12, Vol.49 (8), p.634-637
• Main Authors: Singh, D.K., Pandey, D.K., Yadav, R.R.
• Format: Article
• Language: English
• Subjects: Acoustical measurements and instrumentation; Acoustics; Chromium Compounds - analysis; Chromium Compounds - chemistry; Cross-disciplinary physics: materials science; rheology; Exact sciences and technology; Fundamental areas of phenomenology (including applications); Growth from solutions; Magnetics; Materials science; Methods of crystal growth; physics of crystal growth; Microfluidics - methods; Nanoparticles - chemistry; Nanoparticles - ultrastructure; Nanoscale materials and structures: fabrication and characterization; Nanostructures; Particle Size; Physics; SEM; Ultrasonic measurements; Ultrasonography - methods; Viscosity; XRD
• ISSN: 0041-624X; 1874-9968
• DOI: 10.1016/j.ultras.2009.03.005

Nanoparticles of Cr 2O 3 are prepared through hydrothermal synthesis process using CrO 3/PVA in aqueous solution using sucrose as a reducing agent. The calcination temperature is taken 300 and 350 °C. XRD and SEM of the powdered Cr 2O 3 particles are done for the characterization. The average particle size is found 30–80 nm. It is found that average particle size increases with calcination temperature. The UV–visible absorption spectra are taken for the study of photo-physical properties of ferrofluids. Ultrasonic velocity and absorption measurements are performed in Cr 2O 3 ferrofluid using variable path interferometer and pulse-echo techniques, respectively. The achieved results are discussed in correlation with the magnetic and other physical properties of Cr 2O 3.