Alignment of carbon nanotubes comprising magnetically sensitive metal oxides in heat transfer nanofluids

► High speed microscopy was utilized to allow real time visualization of the movement of nanoparticles including SWNT and Fe2O3. ► This electrostatic force induced alignment could maintain nanotube perfect conjugate structures which result in excellent thermal, electrical, and mechanical properties. ► The alignment of the carbon nanotubes in nanosuspensions may offer new opportunities for the development of nanofluids. ► These nanosuspensions also could be used in films, polymer composites, transparent electrodes, electromagnetic interference shielding, new sensors, etc.