- 期刊
Formation of Crystalline Nickel Fibers by Chemical Reduction in the Presence of a Magnetic Field
磁場環境中以化學還原法產製鎳絲
摘要
本研究以化學還原法在磁場環境中產製鎳絲。鎳絲是由眾多成核點，沿著磁力線方向排列而成。這些極細微的鎳粒子是由化學還原法所生成的。動力學的量測結果顯示反應存在著誘導期，之後才發生沈澱反應。這些生成的粒子受到磁場的作用，會沿著磁力線方向成長為鎳絲。反應液的pH值對於生成的鎳絲直徑，具有顯著的影響。當pH值由11.5增為14.5時，所生成的鎳絲直徑將由50μm變為1μm。此外，當磁場強度大於50 Oe，將可得到長度大於5公分的鎳絲。本文對鎳絲的電磁特性也有所量測及報導。
關鍵字
無資料並列摘要
It was demonstrated that crystalline nickel fibers could be synthesized by a chemical method under the influence of magnetic field. The fibers would grow from a few nucleation points in the direction of magnetic field. We believed that ultra-fine nickel powders were first produced by chemical reduction. Kinetic measurements indicated that there was an induction period prior to the precipitation process. These ultra-fine powders were then magnetized and grew into fibers along the direction of magnetic field. The diameters of these fibers were strongly affected by the starting pH of the precursor solution, varying from 50 μm to around 1μm when pH was changed from 11.5 to 14.5. On the other hand, when the magnetic field was above 50 Oe (Oersted), we could always obtain fiber with lengths over 5 cm. Both electrical and magnetic properties were also reported for these Ni fibers.