The invention discloses an ultrasonic assistant hydro-thermal synthesis process for magnetic Fe3O4 nanometer super
fine grain. The invention solves the problems of impure products and large grain
diameter. The invention has the technical proposal that the form of Fe3O4
crystal nucleus is promoted in the
cavitation effect of ultrasonic;
cavitation gas bubble is produced in mediums; the pH value of strong
ammonia is adjusted to 11 to 13; and the nanometer grain
diameter size and the magnetic characteristics are controlled by controlling the hydro-thermal synthesis temperature within range from 140 DEG C to 160 DEG C and within time of 3 to 5 hours, and by changing the
micro environment of the
air bubble chamber, so as to obtain the dry product which is black magnetic Fe3O4 nanometer
powder after being milled. The invention comprises no
organic solvent, belonging to full green
environmental protection which is a break in the field, and the invention is also the first to use the
ultrasonic technology for assistant hydro-thermal synthesis. The invention has the advantages of simple technology, low cost, small
powder granularity and even grain
diameter. The
powder not only can be used as duplicate ink powder, but also can be board used in aspects such as medical, biological technology, magnetic immunocyte separation,
DNA separation,
nucleic acid hybridization, and preparation for magnetic butt directional
medicine carrying micron ball.