无稳定剂共沉淀法合成条件对纳米磁铁矿结构和粒径的影响

IF 2.7 4区 材料科学 Q3 CHEMISTRY, PHYSICAL
Maoxue Xia, Yu Liu, N. Huang, Hongyu Zhu, J. Hao
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引用次数: 0

摘要

磁铁矿(Fe3O4)纳米颗粒(MNPs)的独特性质促进了其在各个领域的广泛应用,但为了获得理想的单分散尺寸,明确和定义MNPs的制备条件仍然是一个挑战。系统地讨论了无稳定剂共沉淀法中合成条件对MNPs结构和尺寸的影响。考察了NH4OH/Fe3+比、Fe3+/Fe2+比、HCl初始浓度、铁离子总浓度、反应温度、老化时间和洗涤次数。在高NH4OH/Fe3+比下,磁铁矿晶体表面容易氧化,反应体系的高pH值可诱导出较大的晶体尺寸。通过DLVO力和非DLVO力的平衡,有效地控制了MNPs的水动力直径。适当的HCl初始浓度和较高的反应温度可使结晶成核速率减慢,从而减小晶粒尺寸。时效时间和总铁浓度对晶粒尺寸有积极影响。值得注意的是,每次离心洗涤后,分散在蒸馏水中的MNPs的pH值会因表面羟基的吸收而显著降低。本研究为共沉淀法制备MNPs的可重复性提供了基础支持。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Influence of synthesis conditions on the structure and size of magnetite nanoparticles in co-precipitation method without stabilizer in one system
Unique properties of magnetite (Fe3O4) nanoparticles (MNPs) have promoted wide applications in various fields, but specifying and defining preparation conditions of MNPs are still challenges for the desired monodispersed size. We discussed systematically the influence of synthesis conditions on the structure and size of MNPs in co-precipitation method without stabilizer in one system. NH4OH/Fe3+ ratio, Fe3+/Fe2+ ratio, initial concentration of HCl, total concentration of iron ions, reaction temperature, aging time and washing times were investigated. The surface of magnetite crystal was easily oxidized at high NH4OH/Fe3+ ratio, and the high pH value of the reaction system can induce the large crystalline size. The hydrodynamic diameter of MNPs was efficiently controlled by the equilibrium of DLVO forces and non-DLVO forces. An appropriate initial concentration of HCl and higher reaction temperature can reduce the crystalline size due to the decelerated nucleation rate. The aging time and the total concentration of iron affected the crystalline size positively. Noticeably, pH value of MNPs dispersion in distilled water would remarkably reduce after each washing by centrifugation due to surface absorption of hydroxy group. This research provided the fundamental support for the reproducible preparation of MNPs in co-precipitation method.
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来源期刊
Surface Innovations
Surface Innovations CHEMISTRY, PHYSICALMATERIALS SCIENCE, COAT-MATERIALS SCIENCE, COATINGS & FILMS
CiteScore
5.80
自引率
22.90%
发文量
66
期刊介绍: The material innovations on surfaces, combined with understanding and manipulation of physics and chemistry of functional surfaces and coatings, have exploded in the past decade at an incredibly rapid pace. Superhydrophobicity, superhydrophlicity, self-cleaning, self-healing, anti-fouling, anti-bacterial, etc., have become important fundamental topics of surface science research community driven by curiosity of physics, chemistry, and biology of interaction phenomenon at surfaces and their enormous potential in practical applications. Materials having controlled-functionality surfaces and coatings are important to the manufacturing of new products for environmental control, liquid manipulation, nanotechnological advances, biomedical engineering, pharmacy, biotechnology, and many others, and are part of the most promising technological innovations of the twenty-first century.
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