Abstract—

Nickel nanoparticles are obtained by electrical explosion of wire under the action of a high-voltage discharge followed by condensation in an inert gas medium. When butane is added to the gas medium, a carbon shell is deposited onto the condensing nickel particles. Immediately after the synthesis, liquid-phase modification of nanoparticles is carried out with aqueous solutions of polysaccharides agarose and gellan. As a result, a polymer shell is formed on particles of Ni and nickel particles coated with a carbon shell (Ni@C). The dispersity, crystalline structure, and magnetic properties of Ni and Ni@C nanoparticles are characterized by transmission microscopy, X-ray diffraction analysis, and vibration magnetometry. The total carbon content on the surface of the nanoparticles is determined by thermal analysis with simultaneous mass spectrometry. It is shown that, under the studied conditions, polysaccharides are deposited onto the nanoparticles in amounts up to 2 wt % to form a shell with a thickness of about 4 nm. When agarose is used as a modifier, the content of the polysaccharide increases with the concentration of the modifying solution. When gellan is used as a modifier, a more complex concentration dependence is observed: an initial increase is followed by a decrease in the amount of deposited polysaccharide. The results are discussed from the viewpoint of the influence of the molecular weight of a polymer on the adsorption process.

中文翻译：

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镍纳米粒子在多糖壳中的原位封装过程中通过电爆炸线制造

摘要——

镍纳米颗粒是通过金属丝在高压放电作用下发生电爆炸，然后在惰性气体介质中冷凝而获得的。当将丁烷添加到气体介质中时，碳壳沉积在冷凝的镍颗粒上。合成后，立即用多糖琼脂糖和结冷胶的水溶液对纳米颗粒进行液相修饰。结果，在Ni颗粒和涂覆有碳壳的镍颗粒(Ni@C)上形成聚合物壳。通过透射显微镜、X射线衍射分析和振动磁力测定法对Ni和Ni@C纳米颗粒的分散性、晶体结构和磁性能进行了表征。通过热分析和同步质谱法测定纳米颗粒表面的总碳含量。结果表明，在研究条件下，多糖以高达 2 wt% 的量沉积在纳米颗粒上，形成厚度约为 4 nm 的壳。当使用琼脂糖作为修饰剂时，多糖的含量随着修饰液浓度的增加而增加。当结冷胶用作改性剂时，观察到更复杂的浓度依赖性：沉积的多糖量最初增加，随后减少。从聚合物分子量对吸附过程的影响的角度讨论了结果。多糖的含量随着改性液浓度的增加而增加。当结冷胶用作改性剂时，观察到更复杂的浓度依赖性：沉积的多糖量最初增加，随后减少。从聚合物分子量对吸附过程的影响的角度讨论了结果。多糖的含量随着改性液浓度的增加而增加。当结冷胶用作改性剂时，观察到更复杂的浓度依赖性：沉积的多糖量最初增加，随后减少。从聚合物分子量对吸附过程的影响的角度讨论了结果。