合金载液磁性液体内非晶粒子与载液界面稳定性研究

Magnetic fluids with alloy carrier liquids, fabricated by doping Fe-based amorphous particles into Ga-In-Ag alloy liquids, exhibit wide operating temperature range, high conductivity as well as high thermal conductivity compared with magnetic fluids used water, oil or other organic as carrier liquids. However, the poor stability resulted by the interaction between amorphous nanoparticles and alloy carrier liquid, limits the development of these magnetic fluids. Based on the research of liquid structure and properties in our laboratory, we will study the interface stability between metallic glass particles and Ga-In-Ag alloy carrier liquid. We will focus on the coating process of nanoparticles, and the effect of surface coating on the magneoviscous effect and flow properties. It is hoped to find the effect of surface coating on the aggregation and dispersity of nanoparticles. We will explore preparation methods of new amorphous nanoparticles, and establish the relation between the compositions of surface coating on the nanoparticles and saturation magnetization. The results will provide theoretical basis for research and development of new alloy carrier liquid based on magnetic liquid which has more wide industrial application values.

将纳米铁基非晶合金粒子，经包覆后加入Ga-In-Ag合金液体中，制成的新合金载液磁性液体，除具有普通使用的以水、油、有机物等作为载液的磁性液体的主要用途外，还具有使用温度范围宽,导热和导电系数高等优点。但由于纳米非晶粒子与合金载液的相互作用使这类磁性液体稳定性差，限制了该材料的发展。利用本研究室在液体结构和性质研究方面的基础条件，研究金属非晶纳米粒子与Ga-In-Ag 合金载液之间的界面稳定性，主要包括纳米颗粒的涂覆过程研究，涂覆层对磁粘滞性及流动特性的影响，以及非晶颗粒表面涂覆层对磁性粒子团聚性及分散性的影响。探索适合于金属载液的新的非晶纳米颗粒的制作方法，建立非晶颗粒涂覆层成分与饱和磁化强度的关系，为研制和开发具有更宽工业应用价值的新合金载液磁性液体打下理论基础。

磁性液体是一种新型的功能材料，具有独特的磁流变特性，在航空航天、汽车工业等领域具有广阔的应用前景。到目前为止，关于以液态金属为载液的磁性液体稳定性及流变性能的报道较少。本课题研制了一种液态金属基磁性液体，研究了磁性颗粒与液态金属间的界面及相互作用，研究了其流变性和稳定性；用雾化法和机械球磨法制备了Fe78Si9B13非晶颗粒，由这种颗粒制备的非晶软磁磁性液体的屈服强度是普通Fe3O4磁性液体的100倍以上；利用多元醇法制备了具有核壳结构的FeCo@CoFe2O4磁性纳米颗粒，体积分数为7%的FeCo@CoFe2O4颗粒制备的正辛烷基磁性液体表现出优异的稳定性。新研制的FeZrB非晶磁性液体具有高的磁致热效率，其交流磁场的比吸收速率是Fe3O4磁性液体的2.4倍。.在该课题的资助下，已按原计划在磁性液体研究方面取得了创新性成果，圆满完成原计划要求。培养博士生4人，其中2人已获得博士学位。获国家发明专利4项，发表学术论文14篇。