PREPARATION AND CHARACTERIZATION OF PVA COATED MAGNETIC NANOPARTICLES*

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PREPARATION AND CHARACTERIZATION OF PVA COATED MAGNETIC NANOPARTICLES*

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- PREPARATION AND CHARACTERIZATION OF PVA COATED MAGNETIC NANOPARTICLES*
- PREPARATION AND CHARACTERIZATION OF PVA COATED MAGNETIC NANOPARTICLES*
- 高分子科学（英文版） 2000年18卷第6期页码：535-539
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- 纸质出版：2000-12-20
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PREPARATION AND CHARACTERIZATION OF PVA COATED MAGNETIC NANOPARTICLES*[J]. 高分子科学（英文版）, 2000,18(6):535-539.

PREPARATION AND CHARACTERIZATION OF PVA COATED MAGNETIC NANOPARTICLES*[J]. 2000, 18(6): 535-539.
PREPARATION AND CHARACTERIZATION OF PVA COATED MAGNETIC NANOPARTICLES*[J]. 高分子科学（英文版）, 2000,18(6):535-539. DOI：

PREPARATION AND CHARACTERIZATION OF PVA COATED MAGNETIC NANOPARTICLES*[J]. 2000, 18(6): 535-539. DOI：

摘要

Polyvinyl alcohol coated magnetic particles (PVA ferrofluids) have been synthesized by chemical co-precipitationof Fe(Ⅱ)/Fe(Ⅲ) salts in 1.5 mol/L NH4OH solution at 70℃ in the presence of PVA. The resultant colloidal particles havecore-shell structures

in which the iron oxide crystallites form the cores and PVA chains form the shells. The hydrodynamicdiameter of the colloidal particles is in the range of 108 to 155 nm

which increases with increasing PVA concentration from5 wt% to 20 wt%. The size of the magnetic cores is ca.5～10 nm

which is relatively independent of PVA concentration.Under transmission electron microscopic (TEM) examination

the magnetic cores exhibit somewhat irregular shapes varying from spherical

oval

to cubic.Magnetometry measurement revealed that the PVA coated magnetic particles are superparamagnetic.The saturation magnetization of 5 wt% and 20wt% PVA ferrofluids at 300 K is 54 and 49 emu/g

respectively.All the PVA ferrofluids exhibited excellent colloidal stability in pure water and phosphate buffer saline (PBS

pH=7.4).The ferrofluids can remain stable in above solutions for more than three months at 4℃.

Abstract

in which the iron oxide crystallites form the cores and PVA chains form the shells. The hydrodynamicdiameter of the colloidal particles is in the range of 108 to 155 nm

which increases with increasing PVA concentration from5 wt% to 20 wt%. The size of the magnetic cores is ca.5～10 nm

which is relatively independent of PVA concentration.Under transmission electron microscopic (TEM) examination

the magnetic cores exhibit somewhat irregular shapes varying from spherical

oval

to cubic.Magnetometry measurement revealed that the PVA coated magnetic particles are superparamagnetic.The saturation magnetization of 5 wt% and 20wt% PVA ferrofluids at 300 K is 54 and 49 emu/g

respectively.All the PVA ferrofluids exhibited excellent colloidal stability in pure water and phosphate buffer saline (PBS

pH=7.4).The ferrofluids can remain stable in above solutions for more than three months at 4℃.

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