A Method for Preparing Superparamagnetic Nanomaterial

Abstract Substances with superparamagnetism, a special magnetic effect, are magnetized under external field. When the applied field disappears, superparamagnetic substances have almost zero magnetization intensity, quite small coercivity. The performance of powder or suspension used in particle detection greatly affects sensitivity. This paper studies new method for preparing nano-superparamagnetic non-destructive testing materials by combing membrane technology and chemical co-precipitation method. Magnetic nano-ferroferric oxide particles were prepared reactor based on to find optimal synthesis conditions particles. Polymer nano-magnetic good dispersibility, high uniform size distribution obtained, which can well detect cracks, especially cracks. It is nondestructive material.