Bio Ceramics 61 69

Information about Bio Ceramics 61 69

Published on January 11, 2008

Author: Candelora

Source: authorstream.com

Content

Slide1:  Hyperthermia of cancer with ferrimagnetic microspheres. Ferrimagnetic microspheres (20-30 mmf) Heat Tumor Catheter Artery Microsphere Alternating magnetic field Alternating magnetic field Slide2:  FE-SEM photographs of magnetite microspheres prepared by melting powders in high-frequency induction thermal plasma. Slide3:  100 200 300 10 -10 20 -20 -100 -200 -300 0 Hysteresis loops under magnetic field up to 300 Oe of the microspheres prepared by melting powders in high-frequency induction thermal plasma, in comparison with that of magnetite-containing glass-ceramic. Magnetite microspheres prepared by melting powders in high-frequency induction thermal plasma Magnetite-containing glass-ceramic Slide4:  Fe3O4-saturated 1% HF solution (Fe-HF) Silica glass microspheres Soaking in Fe3O4-saturated 1% HF solution (Fe-HF) at 30ºC for various periods. Fe-HF (30ºC, 600 mL) Silica glass microspheres (12.4 µmf, 0.710 g) 1% HF Fe3O4 powder Soaking in Fe-HF at 30ºC for various periods (i) Fe3+ fluoro complex + mH2O (ii) SiO2 + 6HF [SiF6]2- + 2H2O + 2H+ ß-FeOOH + nHF Stirring Slide5:  10 20 30 40 50 Before soaking 6 d 12 d 18 d 24 d Powder XRD patterns of silica glass microspheres soaked in Fe-HF solution at 30C for various periods. 2 / degree Intensity / arb. u. : b-FeOOH : SiO2 (quartz) Slide6:  10 20 30 40 100 Before treatment 400C 500C 600C 2 / degree Intensity / arb. u. Powder XRD patterns of ß-FeOOH-coated microspheres before and after heat treatment at various temperatures for 1 h in 70CO2+30H2 (mol%). 70CO2+30H2 300C : Fe3O4 (Magnetite) : ß-FeOOH Slide7:  FE-SEM photograph of a silica glass microsphere coated with magnetite by a precipitation from solution. Slide8:  Hysteresis loops under magnetic field up to 300 Oe of the microspheres prepared by melting powders in high-frequency induction thermal plasma and a precipitation from solution after the subsequent heat treatment, in comparison with that of magnetite-containing glass-ceramic. Magnetite microspheres prepared by melting powders in high-frequency induction thermal plasma Magnetite microspheres prepared by a precipitation from solution Magnetite-containing glass-ceramic 100 200 300 10 -10 20 -20 -100 -200 -300 0 Slide9:  TEM photograph of magnetite precipitated from solution onto the surface of silica glass microspheres.

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