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Control of the interparticle spacing in superparamagnetic iron oxide nanoparticle clusters by surface ligand engineering |
| Dan Wang(王丹)1, Bingbing Lin(林兵兵)1, Taipeng Shen(申太鹏)1, Jun Wu(吴君)1, Fuhua Hao(豪富华)2, Chunchao Xia(夏春潮)3, Qiyong Gong(龚启勇)3, Huiru Tang(唐惠儒)2, Bin Song(宋彬)3, Hua Ai(艾华)1,3 |
1 National Engineering Research Center for Biomaterials, Sichuan University, Chengdu 610064, China;
2 Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071, China;
3 Department of Radiology, West China Hospital, Sichuan University, Chengdu 610041, China |
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Abstract Polymer-mediated self-assembly of superparamagnetic iron oxide (SPIO) nanoparticles allows modulation of the structure of SPIO nanocrystal cluster and their magnetic properties. In this study, dopamine-functionalized polyesters (DA-polyester) were used to directly control the magnetic nanoparticle spacing and its effect on magnetic resonance relaxation properties of these clusters was investigated. Monodisperse SPIO nanocrystals with different surface coating materials (poly(ε-caprolactone), poly(lactic acid)) of different molecular weights containing dopamine (DA) structure (DA-PCL2k, DA-PCL1k, DA-PLA1k)) were prepared via ligand exchange reaction, and these nanocrystals were encapsulated inside amphiphilic polymer micelles to modulate the SPIO nanocrystal interparticle spacing. Small-angle x-ray scattering (SAXS) was applied to quantify the interparticle spacing of SPIO clusters. The results demonstrated that the tailored magnetic nanoparticle clusters featured controllable interparticle spacing providing directly by the different surface coating of SPIO nanocrystals. Systematic modulation of SPIO nanocrystal interparticle spacing can regulate the saturation magnetization (Ms) and T2 relaxation of the aggregation, and lead to increased magnetic resonance (MR) relaxation properties with decreased interparticle spacing.
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Received: 22 May 2016
Accepted manuscript online:
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PACS:
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75.75.-c
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(Magnetic properties of nanostructures)
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81.16.Dn
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(Self-assembly)
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87.61.-c
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(Magnetic resonance imaging)
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87.85.J-
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(Biomaterials)
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| Fund: Project supported by the National Key Basic Research Program of China (Grant No. 2013CB933903), the National Key Technology R&D Program of China (Grant No. 2012BAI23B08), and the National Natural Science Foundation of China (Grant Nos. 20974065, 51173117, and 50830107). |
Corresponding Authors:
Hua Ai
E-mail: huaai@scu.edu.cn
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Cite this article:
Dan Wang(王丹), Bingbing Lin(林兵兵), Taipeng Shen(申太鹏), Jun Wu(吴君), Fuhua Hao(豪富华), Chunchao Xia(夏春潮), Qiyong Gong(龚启勇), Huiru Tang(唐惠儒), Bin Song(宋彬), Hua Ai(艾华) Control of the interparticle spacing in superparamagnetic iron oxide nanoparticle clusters by surface ligand engineering 2016 Chin. Phys. B 25 077504
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