Ferrofluid Transport Analysis for Micro- and Mesoscale Applications

Abstract

Magnetically induced accumulation and dispersion of ferrofluid in a forced flow of nonmagnetic fluid is studied experimentally and numerically to characterize the ferrofluid transport. The analysis would directly benefit several microscale and mesoscale applications like magnetic drug targeting and ferrofluid lithography. Experimental observation reveals existence of a ferrofluid core near the dipole, where the field gradient is high, and a washaway region. Numerical simulations show the ferrofluid mass flux in a similar configuration. Also, selective deposition of ferrofluid on a substrate wall exposed to a forced flow of nonmagnetic fluid is demonstrated numerically.

Microfluidic transport in magnetic MEMS and bioMEMS

“…Depending upon the size of a magnetic nanoparticle and the viscosity of the medium in which it is suspended, the magnetic relaxation can be Brownian, in which case the entire particle rotates physically to align with the imposed field, or Néelian when the magnetic moment inside the particle rotates without any bodily rotation of the particle (Figure 1(a)). The effective relaxation of the magnetic nanoparticle is dominated by the faster of the two mechanisms 24…”

Nanomaterials and nanocomposite applications in veterinary medicine

“…The magnetic properties of MNPs are used in many applications, e.g., microwave absorption [34], electrochemical sensing [35], ferrofluids [36], energy storage [37], magnetic resonance imaging, and data storage [38]. Since these magnetic properties are dependent on MNP size and shape, as shown in Fig.…”