镍茂的声化学分解效应,研究了在低温下容易升华的镍细颗粒的合成方法。在一水合肼和2-丙醇混合溶剂中,超声辐照促进了镍茂的还原,合成了镍细颗粒,同时排除了镍茂的升华。与常见的肼还原镍盐不同,这需要多步反应,镍茂直接还原而不形成中间体。研究了水浴温度(20-60°C)的影响,其中使用较高的水浴温度(60°C)合成较大的细颗粒。当在20°C下照射时,镍新世的还原率低,通过镍茂的还原和分解,导致镍细颗粒和有机纳米颗粒的形成。还调查了超声频率,其中使用低频超声辐照合成了细镍颗粒。高温热点的形成导致镍在镍细颗粒表面的扩散和生长;因此,合成了树莓状镍细颗粒。在这项研究中,镍新世的难以处理的性质,由于它的升华特性,很容易被超声波照射克服。热点处的瞬时和局部反应有助于抑制颗粒生长。此外,通过直接还原途径合成Ni细颗粒,这与以前的反应不同。此方法表示一个新的,无分散剂,合成Ni细颗粒的低温工艺。
Sonochemical decomposition effects of nickelocene, which sublimates easily were investigated to synthesize dispersant-free nickel fine particles at low temperature. In a hydrazine monohydrate and 2-propanol mixed solvent, the reduction of nickelocene was promoted by ultrasound irradiation, and nickel fine particles were synthesized while precluding the sublimation of nickelocene. Unlike the common hydrazine reduction of nickel salts, which requires multiple-step reactions, nickelocene was reduced directly without forming intermediates. The effect of the water-bath temperature (20-60 °C) was investigated, where larger fine particles were synthesized using a higher water-bath temperature (60 °C). When irradiated at 20 °C, the reduction rate of nickelocene was low, leading to the formation of nickel fine particles and organic nanoparticles via the reduction and decomposition of nickelocene. The ultrasound frequency was also investigated, where fine nickel particles were synthesized using low-frequency ultrasound irradiation. The formation of high-temperature hotspots led to the diffusion and growth of nickel on the surface of the nickel fine particles; therefore, raspberry-like nickel fine particles were synthesized. In this study, the difficult-to-handle nature of nickelocene, owing to its sublimation properties, was easily overcome by ultrasound irradiation. Instantaneous and localized reactions at hotspots contributed to inhibiting particle growth. Furthermore, Ni fine particles were synthesized via a direct reduction pathway, which differs from previous reactions. This method represents a new, dispersant-free, low-temperature process for synthesizing Ni fine particles.