Monodisperse Fe3O4 spheres: Large-scale controlled synthesis in the absence of surfactants and chemical kinetic process  

无表面活性剂条件下大规模可控制备单分散Fe3O4及其化学动力学过程研究（英文）

作　　者：Yana Li Zhiyi Wang Zeeshan Ali Kesong Tian Junjie Xu Wei Li Yanglong Hou 李雅娜;汪志义;Zeeshan Ali;田克松;徐俊杰;李巍;侯仰龙(Beijing Key Laboratory for Magnetoelectric Materials and Device (BKLMMD), Beijing Innovation Center for Engineering Science and Advanced Technology (BIC-ESAT), Department of Materials Science and Engineering, College of Engineering, Peking University)

机构地区：[1]Beijing Key Laboratory for Magnetoelectric Materials and Device(BKLMMD),Beijing Innovation Center for Engineering Science and Advanced Technology(BIC-ESAT),Department of Materials Science and Engineering,College of Engineering,Peking University,Beijing 100871,China

出　　处：《Science China Materials》2019年第10期1488-1495,共8页中国科学（材料科学（英文版）

基　　金：financially supported by the National Natural Science Foundation of China(51631001,51672010 and81421004);the National Key R&D Program of China(2017YFA0206301 and 2016YFA0200102)

摘　　要：Fe3 O4 has attracted tremendous interest in vast areas of biomedicine and catalysis as well as environment engineering.However,it is highly desired to fully understand the chemical kinetic process and propose a general,surfactantfree,large-scale synthesis approach for Fe3 O4 spheres.Herein,we developed a facile scalable solvothermal method in the absence of surfactants to produce Fe3 O4 spheres with the yield of 5.1 g,which present tunable sizes from 107 to 450 nm by modulated molar ratio of Fe3+/COO-in the solution.Particularly,it is observed that the reactants undergo a redox process,composed of a precipitation-dissolution equilibrium combined with a coordination reaction(termed as RPC),to the final product based on the LaMer model.It is worth noting that the generation of di-carboxyl group and its coordination with iron cations determine the formation of Fe3 O4 spheres.This work not only offers a strategy to precisely tailor the particle size in scalable synthesis process,but also gives the insight on the role of dihydric alcohol in the formation mechanism of Fe3 O4 spheres in the absence of surfactants.Fe3O4微球被广泛应用于生物医药、催化和环境工程领域.理解Fe3O4微球的化学动力学过程并发展一种通用的、无表面活性剂的大规模合成Fe3O4微球的方法成为当前的迫切需求.本文提出了一种简单的无表面活性剂的方法用于大规模合成Fe3O4微球,通过调节溶液中Fe^3+/COO^-的比例,合成了直径为107到450 nm的Fe3O4微球.研究表明,反应物通过氧化还原反应、沉淀溶解平衡和配位过程形成最终反应产物.其中,二羧基基团和铁离子的配位促进了Fe3O4微球的形成.本文不仅提供了一种在大规模合成反应过程中调控产物尺寸的方法,而且详细研究了在无表面活性剂条件下合成Fe3O4微球过程中醇起到的特殊作用.

关 键 词：Fe3O4spheres SURFACTANT-FREE large-scale synthesis chemical kinetic process 

分 类 号：TB3[一般工业技术—材料科学与工程]