Experimental investigations on ultrasound mediated particle breakage

Abstract

This paper investigates the effect of high-intensity ultrasound on the breakage characteristics of particles suspended in water. A continuous sonicated flow experimental apparatus is used involving a 24 kHz horn type transducer and continuous in-line particle chord length measurement. The effects of sonication power (150-350 W) and temperature (10-50 degrees C) on the breakage characteristics are investigated. Higher breakage is favored at higher sonication power. An optimum temperature in the range tested is observed to exist between 25 degrees C and 37 degrees C. The acoustic cavitation field is influenced by temperature through a complex interplay of vapor pressure, surface tension and viscosity leading to the optimum observed in particle breakage. The efficiency of ultrasound energy conversion to particle breakage is calculated using calorimetry and found along with the net breakage efficiency to initially increase with temperature followed by a decrease after the optimum. It is found to be independent of input ultrasonic power. The effects of contact time is also investigated.

The Effect of Ultrasound on the Crystallisation of Paracetamol in the Presence of Structurally Similar Impurities

“…This is consistent with both the impact of impurities inhibiting nucleation and growth combined with the low ultrasound intensity at the 50% power level (0.19 ± 0.06 mW/cm 2 ) compared with the high, 100% ultrasound power (1.45 ± 0.21 mW/cm 2 ). Ultrasound has been reported to cause crystal breakage [20,37,39,[76][77][78]. The breakage rate triggered by stable cavitation is reported to be independent of the applied power for paracetamol crystals with a median size (volume based distribution) of 75 µm and that a particle size threshold of ca.…”

‘Poly(ethylene glycol)-magnetic nanoparticles-curcumin’ trio: Directed morphogenesis and synergistic free-radical scavenging

“…The cavitation forces induced during transient collapse of cavitating bubbles are of immense significance, particularly in the domain of material science. Several chemical and physical effects of sonication have been reported in literature [27]. Sonication seems to be an attractive means for bioconjugation onto polymer supported nanomaterial, thereby shunning the use of toxic linkers such as carbodiimide, routinely employed for coupling antibodies, enyzmes.…”

Preparation of TiO2 epoxy nanocomposites by ultrasonic dispersion and resulting properties

“…3,4 In the last years, sonication proofed to be an adequate alternative technique for the dispersion of nanoparticles. 5,6 However, most studies were carried out in aqueous solutions, 7 and there is only very few experiences for the ultrasonic dispersion of particles in highviscosity liquids such as epoxy resin. 8,9 As a consequence, the reported processing conditions reported by different researchers differ very much.…”