氧化錳鐵奈米材料之合成與磁流變性質研究

Synthesis and Magnetorheology Characteristics of MnFe2O4 Materials

葉俊廷(Chun-Ting Yeh)

指導教授 ： 芮祥鵬

國立臺北科技大學/工程學院/有機高分子研究所/碩士(2010年)

摘要

本研究中MnFe2O4 nanoparticles(NPs)用熱烈解法去合成而得之，反應過程中改變反應溫度並保持反應恆溫的方式，藉此合成出三種不同粒徑的MnFe2O4 nanoparticles(NPs)，經由XRD與TEM鑑定其成分及構型。Iron(III) chloride(FeCl3．6H2O)與Manganese(II) chloride(MnCl2．6H2O)與去離子水均勻混合後置入鐵氟龍內杯中，並逐滴添加氫氧化納強鹼水溶液參與反應，將鐵氟龍內杯放入不銹鋼外殼中封裝好(即壓力釜)放入烘箱中反應經水熱法(hydrothermal process)合成即可得MnFe2O4 nanorods(NRs)，經由XRD與SEM鑑定其成分與構型。
將所合成之MnFe2O4 nanoparticles(NPs)與MnFe2O4 nanorods(NRs)，分散於矽油中，配置成磁性流體。藉由雙平板磁流變儀來測量磁性流體的磁流變性質，藉此瞭解磁性奈米粒子與奈米棒對於磁性流體的磁流變性質的影響，並研究如何掌握磁性流體的磁控性質的方法。我們藉由流動曲線測試、潛變恢復測試以及黏彈測試去進行磁流變效應探討，研究結果顯示磁性流體之磁流變效應值將隨著磁通量密度增加而提升，且較大濃度之磁性流體其磁流變效應較佳，此外，MnFe2O4 nanorods(NRs)所配製的磁性流體於各項磁流變測試中其磁流變效應皆較MnFe2O4 nanoparticles(NPs)所配製的為顯著。

關鍵字

氧化錳鐵 ； 奈米棒 ； 磁性流體 ； 磁流變

並列摘要

MnFe2O4 nanoparticles(NPs) with 3 different sizes were synthesized by varying the reaction temperature during the thermal decomposition reaction of metal complex and high boiling point solvent in this study. The product was characterized by XRD and TEM for it’s purity and morphology. MnFe2O4 nanorods(NRs) were synthesized by hydrothermal process. Iron(III) chloride(FeCl3．6H2O) and Manganese(II) chloride(MnCl2．6H2O) were mixed, dissolved in distilled water with assistance of magnetic stirring, and then transferred into a Teflon-lined autoclave. At last, NaOH solution slowly added dropwisely into the mixed solution and the autoclave was sealed, put into an oven. The product was characterized by XRD and SEM for it’s purity and morphology.
Mix the MnFe2O4 nanoparticles(NPs) and MnFe2O4 nanorods(NRs) with silicone oil to synthesize ferrofluids and find their magnetorheology characteristics. In this way, we understanded how magnetite nanoparticles and magnetite nanorods effect the magnetorheology characteristics of ferrofluids. The magnetorheological effect were investigated by flow curve test、creep and recovery test and viscoelasticity test. The results show that the magnetic flux density and the concentration of magnetorheologicl fluids increased the magnetorheological effect. Besides, MnFe2O4 nanorods dispersion had much higher magnetorheological effect than MnFe2O4 nanoparticles.

並列關鍵字

MnFe2O4 ； Nanorods ； Ferrofluids ； Magnetorheology

參考文獻

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