In Situ Encapsulation of Nickel Nanoparticles in Polysaccharide Shells during Their Fabrication by Electrical Explosion of Wire

IF 1.4 4区化学 Q4 CHEMISTRY, PHYSICAL Colloid Journal Pub Date : 2023-10-04 DOI:10.1134/S1061933X23600410

A. P. Safronov, I. V. Beketov, A. V. Bagazeev, A. I. Medvedev, A. M. Murzakaev, T. V. Terziyan, A. Yu. Zubarev

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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.

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金属丝电爆炸法制备纳米镍在多糖壳中的原位包封

摘要——镍纳米颗粒是在高压放电的作用下，通过金属丝的电爆炸，然后在惰性气体介质中冷凝而获得的。当丁烷被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的水溶液对纳米颗粒进行液相改性。结果，在涂覆有碳壳的Ni颗粒和镍颗粒上形成聚合物壳(Ni@C)。Ni和Ni的分散性、晶体结构和磁性能Ni@C通过透射显微镜、X射线衍射分析和振动磁强计对纳米颗粒进行了表征。纳米颗粒表面的总碳含量通过同时质谱的热分析来确定。结果表明，在所研究的条件下，多糖以高达2wt%的量沉积在纳米颗粒上，形成厚度约4nm的壳。当使用琼脂糖作为改性剂时，多糖的含量随着改性溶液的浓度而增加。当使用结冷作为改性剂时，观察到更复杂的浓度依赖性：初始增加后沉积的多糖量减少。从聚合物分子量对吸附过程的影响的角度讨论了结果。

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来源期刊

Colloid Journal 化学-物理化学

CiteScore

2.20

自引率

18.20%

发文量

审稿时长

6-12 weeks

期刊介绍： Colloid Journal (Kolloidnyi Zhurnal) is the only journal in Russia that publishes the results of research in the area of chemical science dealing with the disperse state of matter and surface phenomena in disperse systems. The journal covers experimental and theoretical works on a great variety of colloid and surface phenomena: the structure and properties of interfaces; adsorption phenomena and structure of adsorption layers of surfactants; capillary phenomena; wetting films; wetting and spreading; and detergency. The formation of colloid systems, their molecular-kinetic and optical properties, surface forces, interaction of colloidal particles, stabilization, and criteria of stability loss of different disperse systems (lyosols and aerosols, suspensions, emulsions, foams, and micellar systems) are also topics of the journal. Colloid Journal also includes the phenomena of electro- and diffusiophoresis, electro- and thermoosmosis, and capillary and reverse osmosis, i.e., phenomena dealing with the existence of diffusion layers of molecules and ions in the vicinity of the interface.