Tierno Pietro, Goedel Werner A
Organic and Macromolecular Chemistry, University of Ulm.
J Phys Chem B. 2006 Feb 23;110(7):3043-50. doi: 10.1021/jp054213s.
Uniform and stable core-shell microspheres composed of a poly(methyl methacrylate) (PMMA) core and a thin metallic shell of nickel-phosphorus, cobalt-phosphorus, or mixed metal alloys (CoNiP, NiFeP, CoFeP) were prepared by dispersion polymerization of methyl methacrylate followed by electroless plating. The presence of the metallic shell around the particles was confirmed by scanning electron microscopy, energy-dispersive X-ray spectroscopy, and photoelectron spectroscopy. Transmission electron microscopy images of the cross-section of individual particles show that the thickness of the metal/alloy can be precisely tuned by adjusting the immersion time of the microspheres in the electroless bath. Depending on the deposited metallic material, various magnetic properties, from paramagnetic to ferromagnetic, are achieved. Finally, uniform hollow metallic spheres composed of nickel, cobalt, or nickel-cobalt alloy are obtained by dissolving the polymer core.
通过甲基丙烯酸甲酯的分散聚合然后进行化学镀，制备了由聚甲基丙烯酸甲酯（PMMA）核和镍磷、钴磷或混合金属合金（CoNiP、NiFeP、CoFeP）的薄金属壳组成的均匀且稳定的核壳微球。通过扫描电子显微镜、能量色散X射线光谱和光电子能谱确认了颗粒周围金属壳的存在。单个颗粒横截面的透射电子显微镜图像表明，通过调整微球在化学镀浴中的浸泡时间，可以精确调节金属/合金的厚度。根据沉积的金属材料，可实现从顺磁性到铁磁性的各种磁性能。最后，通过溶解聚合物核获得了由镍、钴或镍钴合金组成的均匀空心金属球。
