Method for preparing metal oxide hollow particles or fibers

Method for preparing metal oxide hollow particles or fibers

  • CN 101,898,749 B
  • Filed: 08/02/2010
  • Issued: 07/02/2014
  • Est. Priority Date: 08/02/2010
  • Status: Active Grant
First Claim
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1. the preparation method of a metal oxide hollow particle, it is characterized in that it comprises the steps:

  • 1) polyvinylpyrrolidone is dissolved in the ironic citrate solution that concentration that 30mL prepares is in advance 0.1g/mL, the mass ratio of ironic citrate and polyvinylpyrrolidone is 5;

    4, heats magnetic agitation dehydration and make the concentration of ironic citrate and polyvinylpyrrolidone reach 40wt.% formation electrostatic spray precursor solution at 60 DEG C;

    Electrostatic spray precursor solution is placed in the electrostatic spray feeding device that diameter is 0.6mm syringe needle is housed, the feed speed of solution is 0.1mL/h, adopt the operating voltage of 25kV to carry out electrostatic spray under 25 DEG C of room temperatures, apart from syringe needle 15cm place, collect electrostatic spray product with aluminium flake, obtain PVP/ ironic citrate composite particles;

    2) above-mentioned PVP/ ironic citrate composite particles is placed in to the tube furnace of temperature programmed control together with aluminium flake, rise to 500 DEG C with the temperature rise rate of 10 DEG C/min, then at this temperature, continue calcining 2h, PVP and ironic citrate are decomposed, furnace cooling, prepares γ

    -Fe 2o 3individual layer hollow granule;

    Temperature rise rate is heightened to 20 DEG C/min, repeated above-mentioned thermal treatment process, obtain γ

    -Fe 2o 3nucleocapsid hollow granule;

    Temperature rise rate is heightened to 50 DEG C/min, repeated above-mentioned thermal treatment process, obtain γ

    -Fe 2o 3double-layer hollow particle;

    Temperature rise rate is heightened to 250 DEG C/min, repeated above-mentioned thermal treatment process, obtain γ

    -Fe 2o 3double-deck nucleocapsid hollow granule.

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