Citation: Jing-yun Jing, Xiao-hui Yao, Zhen-zhong Yang. Single Polymer Chain Grafted Fe₃O₄ Composite Janus Nanoparticle[J]. Acta Polymerica Sinica, ;2018, 0(8): 1066-1072. doi: 10.11777/j.issn1000-3304.2018.17233 shu

Single Polymer Chain Grafted Fe₃O₄ Composite Janus Nanoparticle

State Key Laboratory of Polymer Physics and Chemistry, Institute of Chemistry, Chinese Academy of Sciences, Beijing 100190
University of Chinese Academy of Sciences, Beijing 100049

Corresponding author: Zhen-zhong Yang, yangzz@iccas.ac.cn
Received Date: 22 August 2017
Revised Date: 3 November 2017
Available Online: 1 March 2018

An amine group capped Fe₃O₄ nanoparticle (NP) (~ 10 nm) is derived after ligand exchange with a silane against the oleic acid capped Fe₃O₄ NP. Via the termination between the cationic end of a living polymer chain with the amine group onto the NP surface, polymer chains are covalently grafted onto the NP surface, forming the polymer/Fe₃O₄ composite NP. The number of the grafted living polymer chains is determined by the molecular weight of the polymer chains. When a sufficiently long polymer chain with hydrodynamic size larger than the NP diameter is used, the arisen steric repulsion enables only one polymer chain to graft onto the NP surface. The obtained composite NP displays a parachute structure due to the distribution of the grafting polymer chain on one side of the modified Fe₃O₄ NP surface. When a short polymer chain is used, many chains can graft onto the NP surface to form a core/shell like structure. For example, the single poly(4-vinylbenzyl chloride) chain grafted an amine group capped Fe₃O₄ composite Janus NP is amphiphilic, which can serve as a functional solid emulsifier that can easily emulsify water/toluene to obtain a stabilized emulsion. In analogy of a molecular surfactant, a self-assembled monolayer from the composite NPs is achieved by crosslinking the composite NPs at a water/oil interface. The Fe₃O₄ composite Janus NPs can be manipulated with a magnet. Accordingly, the stabilized emulsion droplets emulsified by the composite Janus NPs can be driven with a magnet. This report provides a simple method to massively synthesize Janus NPs at a high solid content. In addition, a huge family of functional Janus NPs will be derived after selective growth of functional species from either poly(4-vinylbenzyl chloride) or (and) the amine group capped side of the parent composite NP.
- Nanoparticle,
- Fe₃O₄,
- Single polymer chain,
- Janus,
- Amphiphilic
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Single Polymer Chain Grafted Fe₃O₄ Composite Janus Nanoparticle