Nuclear acoustic resonance in fluids using piezoelectric nanoparticles

Abstract The influence of acoustic radiation in the form of ultrasound (US) on the nuclear magnetic resonance (NMR) signal of liquids in the presence of piezo- and ferroelectric nanoparticles was investigated. The NMR resonances of 1 H and 23 Na were influenced by US with a frequency of ω US = 18.26 MHz . For hydrogen, US with a frequency ω US = ω 0 was used where ω 0 is the Larmor frequency of 18.26 MHz. For sodium, US with a frequency ω US = 2 ω 0 ,Na was used with ω 0 ,Na = 9.13 MHz . A detailed description of nanoparticle properties and sample preparation is given. The influence of US on the spin–lattice relaxation time T 1 was determined with an inversion recovery sequence for different concentrations of PZT. An elongation of T 1 of 1 H by 1.7% at a PZT concentration of 0.05% and an elongation of T 1 of 23 Na by 3% at a PZT concentration of 0.04% was observed. The elongation scales with the concentration of the PZT. An possible explanation of the effect of elongation is discussed.