本文選題：全氟碳油 + 磁性液體�。� 參考：《沈陽工業(yè)大學(xué)》2017年碩士論文

【摘要】：本文采用VZD-400型直流電弧等離子體法,在總壓力為8×104Pa,的混合氣氛下,蒸發(fā)Fe-Ni合金和純Ni制備了Fe-Ni@SiO_2、Ni@SiO_2合金納米粒子。并以全氟碳油為基液,油酸和十二烷基苯磺酸鈉修飾的Ni@SiO_2、Fe-Ni@SiO_2合金納米粒子作為磁性粒子制備了全氟碳油基磁性液體。本文通過用透射電子顯微鏡(TEM)、X射線衍射(XRD)、X光電子譜(XPS)及BKT-4500型振動(dòng)樣品磁強(qiáng)計(jì)(VSM)等測(cè)試技術(shù),對(duì)已制備出的磁性納米粒子的形貌、粒度、相組成、表面特性以及磁性等進(jìn)行了表征。對(duì)制備的全氟碳油基磁性液體的磁性、粘度及流變特性用振動(dòng)樣品磁強(qiáng)計(jì)(VSM)和粘度計(jì)進(jìn)行研究。研究結(jié)果可以得到,Ni@SiO_2、Fe-Ni@SiO_2合金納米粒子均為類球形,其中Ni@SiO_2粒子外包覆層的厚度大約為2-5nm,粒度分布為10-35nm,Ni@SiO_2納米粒子隨磁場(chǎng)強(qiáng)度的增加其磁化強(qiáng)度程增大趨勢(shì),當(dāng)磁場(chǎng)增加到200KA/m時(shí),磁性納米粒子的磁化強(qiáng)度趨于飽和狀態(tài),其飽和磁化強(qiáng)度為25Am2/kg。Fe-Ni@SiO_2合金納米粒子顆粒度分布為20-60nm,其表面包覆層厚度為3-4nm。在室溫下,測(cè)量出不同濃度的FeNi@SiO_2合金納米粒子的飽和磁化強(qiáng)度為60-70Am2/kg,當(dāng)溫度高于200℃后,其飽和磁化強(qiáng)度開始減小。無論是Ni@SiO_2還是Fe-Ni@SiO_2的全氟碳油基磁性液體,其粘度都隨納米粒子濃度含量的增加而不斷增大,隨溫度的升高呈減小趨勢(shì),但并不遵循嚴(yán)格的線性關(guān)系。Ni@SiO_2和Fe-Ni@SiO_2的全氟碳油基磁性液體的飽和磁化強(qiáng)度都隨納米粒子濃度含量的增加而不斷增大,也不遵循嚴(yán)格的線性關(guān)系。在常溫下,Ni@SiO_2納米粒子濃度含量在5wt%-50wt%時(shí),粘度范圍為1.47×10~3mPa·S-1.96×10~3mPa·S,飽和磁化強(qiáng)度范圍為0.41Am2/kg-4.5Am2/kg。Fe-Ni@SiO_2合金納米粒子濃度為10wt%-45wt%,25℃時(shí),其粘度范圍為1.92×10~3mPa·S-2.53×10~3mPa·S,飽和磁化強(qiáng)度范圍為0.45Am2/kg-9.2Am2/kg,85℃時(shí),粘度范圍為1.33×10~3mPa·S-1.66×10~3mPa·S。全氟碳油基磁性液體的粘度隨剪應(yīng)力的增大而減小,當(dāng)將剪應(yīng)力增大到一定程度其粘度趨于穩(wěn)定,以Ni@SiO_2納米粒子濃度5wt%為例,當(dāng)剪應(yīng)力增加到272017mPa時(shí),其粘度穩(wěn)定在1307mPa·S。
[Abstract]:In this paper, Fe-NiSiO2-NiSiO-2 alloy nanoparticles were prepared by VZD-400 DC arc plasma method in a mixed atmosphere of 8 脳 10 ~ 4 Pa. by evaporating Fe-Ni alloy and pure Ni. Perfluorocarbon oil-based magnetic fluids were prepared by using perfluorocarbon oil as base liquid, oleic acid and sodium dodecylbenzene sulfonate modified Niearth SiO2Fe-NiSiO-2 alloy nanoparticles as magnetic particles. In this paper, the morphology, particle size and phase composition of the prepared magnetic nanoparticles have been studied by means of transmission electron microscopy (TEM) and X-ray diffraction (XPS) and BKT-4500 vibrating sample magnetometer (VSM). Surface properties and magnetic properties were characterized. The magnetic, viscosity and rheological properties of the prepared perfluorocarbon oil based magnetic fluids were studied by vibrating sample magnetometer (VSM) and viscometer. The results show that the nanocrystalline Ni@SiO_2 particles are spherical, and the thickness of the outer coating of the Ni@SiO_2 particles is about 2-5 nm, and the particle size distribution is 10-35 nm. The magnetization range of the NiSiO2 nanoparticles increases with the increase of the magnetic field intensity. When the magnetic field increases to 200KA/m, The magnetization of magnetic nanoparticles tends to be saturated. The saturation magnetization of 25Am2/kg.Fe-Ni@SiO_2 alloy nanoparticles is 20-60 nm and the coating thickness is 3-4 nm. At room temperature, the saturation magnetization of different concentrations of FeNi@SiO_2 nanoparticles was measured to be 60-70 Am2 / kg. When the temperature was above 200 鈩，

本文編號(hào)：1885067