Nickel Colloidal Superparticles: Microemulsion-Based Self-Assembly Preparation and Their Transition from Room-Temperature Superparamagnetism to Ferromagnetism,The Journal of Physical Chemistry C

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Nickel Colloidal Superparticles: Microemulsion-Based Self-Assembly Preparation and Their Transition from Room-Temperature Superparamagnetism to Ferromagnetism
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2021-03-03 , DOI: 10.1021/acs.jpcc.0c11405
Wanjie Xu ₁ , Mingwei Ji ₁ , Yuanzhi Chen ₁ , Hongfei Zheng ₁ , Laisen Wang ₁ , Dong-Liang Peng ₁

Affiliation

The construction of magnetic colloidal superparticles can utilize the properties from both individual assembly units and their collective interactions; thus, it can meet wider demands in multiple fields. Although many studies have focused on the magnetic oxide superparticles, very limited study has been conducted on magnetic metal superparticles. Herein, we report on the microemulsion-based preparation of Ni colloidal superparticles with tunable sizes and magnetic properties. The prepared Ni colloidal superparticles have a spherical morphology with an average size that can vary from 130 to 700 nm. The key influential factors in the formation of superparticles are being investigated. Magnetic measurements reveal room-temperature superparamagnetic characteristics for all superparticle samples. The calculated interaction energy values indicate that strong magnetic interactions are present in Ni superparticles. Although Ni superparticles with a size of about 700 nm are still room-temperature superparamagnetic, annealed Ni superparticles with a much smaller size of about 390 nm instead exhibit room-temperature ferromagnetic characteristics. This behavior is quite different from that of magnetic nanoparticles. Our results demonstrate that the construction of magnetic colloidal superparticles through adjustments to the parameters of the assembling units may provide them with rich magnetic properties, thus making them useful in a wider range of applications.

中文翻译：

镍胶体超颗粒：基于微乳液的自组装制备及其从室温超顺磁性到铁磁性的转变

磁性胶体超微粒的构造可以利用单个组装单元及其集体相互作用的特性。因此，它可以满足多个领域的广泛需求。尽管许多研究集中于磁性氧化物超微粒子，但对磁性金属超微粒子的研究却非常有限。在本文中，我们报道了具有可调大小和磁性的Ni胶体超微粒的微乳液基制备。制备的Ni胶态超颗粒具有球形形态，平均尺寸可在130至700 nm之间变化。正在研究形成超微粒的关键影响因素。磁测量结果显示了所有超微粒样品的室温超顺磁特性。计算出的相互作用能值表明在镍超颗粒中存在强磁性相互作用。尽管具有约700nm的尺寸的Ni超颗粒仍然是室温超顺磁性的，但是具有更小的约390nm的尺寸的退火的Ni超颗粒具有室温的铁磁特性。此行为与磁性纳米粒子的行为完全不同。我们的结果表明，通过调节组装单元的参数构造磁性胶体超微粒可为其提供丰富的磁性，从而使其在更广泛的应用中有用。尺寸更小的约390 nm的退火Ni超颗粒具有室温铁磁特性。此行为与磁性纳米粒子的行为完全不同。我们的结果表明，通过调节组装单元的参数构造磁性胶体超微粒可为其提供丰富的磁性，从而使其在更广泛的应用中有用。尺寸更小的约390 nm的退火Ni超颗粒具有室温铁磁特性。此行为与磁性纳米粒子的行为完全不同。我们的结果表明，通过调节组装单元的参数构造磁性胶体超微粒可为其提供丰富的磁性，从而使其在更广泛的应用中有用。

更新日期：2021-03-18

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