摘要
以微米级Fe3O4粉末和聚乙烯醇(PVA)为原料,采用反复冷冻-融化技术(冻融)制备了Fe3O4/PVA磁性水凝胶,研究了磁性水凝胶的力学性能、磁场阈值,磁性能等随Fe3O4的含量及冻融次数的变化行为,并使用扫描电子显微镜(SEM)以及X射线衍射(XRD)分别研究了Fe3O4/PVA磁性水凝胶的微观形貌和结晶性能。结果表明随冻融循环次数的增加,Fe3O4/PVA磁性水凝胶的力学性能、磁场阈值,及磁性能等均随Fe3O4的含量及冻融次数显著变化;Fe3O4在磁性水凝胶中分布均匀,PVA水凝胶经反复冷冻-融化后结晶性能有所提高。
Magnetic hydrogels based on PVA and magnetite Fe3O4 micron-particles are prepared by the repeated freezing- thawing （F-T） method. Elongation behaviors, magnetic field threshold and other magnetic properties of ferrogels with different Fe3O4 concentrations and freezing-thawing cycle times are systematically investigated, and scanning electron microscopy （SEM） and X-ray diffraction （XRD） technique are used to study the cross-sectional micro-morphology and crystal structures of the Fe3O4/PVA magnetic hydrogels, respectively. The results show that elongation behaviors and magneto-mechanical properties of the Fe3O4/PVA hydrogels are dependent on the Fe3O4 concentrations and freezing-thawing cycles. Magnetic particles are found to be dispersed in hydrngels homogeneously. The degree of crystallization of PVA hydrogels can be improved by increasing the number of freezing-thawing cycles.
出处
《现代化工》
EI
CAS
CSCD
北大核心
2008年第9期60-63,共4页
Modern Chemical Industry
基金
南昌大学博士启动基金(2005061)资助
