Control of the interparticle spacing in superparamagnetic iron oxide nanoparticle clusters by surface ligand engineering

doi:10.1088/1674-1056/25/7/077504

中国物理B ›› 2016, Vol. 25 ›› Issue (7): 77504-077504.doi: 10.1088/1674-1056/25/7/077504

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Control of the interparticle spacing in superparamagnetic iron oxide nanoparticle clusters by surface ligand engineering

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)

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

收稿日期:2016-05-22 出版日期:2016-07-05 发布日期:2016-07-05
通讯作者: Hua Ai E-mail:huaai@scu.edu.cn
基金资助:
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).

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

Received:2016-05-22 Online:2016-07-05 Published:2016-07-05
Contact: Hua Ai E-mail:huaai@scu.edu.cn
Supported by:
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).

摘要/Abstract

摘要：

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 (M_s) and T₂ relaxation of the aggregation, and lead to increased magnetic resonance (MR) relaxation properties with decreased interparticle spacing.

关键词: nanoparticle clusters, interparticle spacing, ligand exchange, magnetization

Abstract:

Key words: nanoparticle clusters, interparticle spacing, ligand exchange, magnetization

中图分类号: (Magnetic properties of nanostructures)

75.75.-c

81.16.Dn (Self-assembly) 87.61.-c (Magnetic resonance imaging) 87.85.J- (Biomaterials)

王丹, 林兵兵, 申太鹏, 吴君, 豪富华, 夏春潮, 龚启勇, 唐惠儒, 宋彬, 艾华. Control of the interparticle spacing in superparamagnetic iron oxide nanoparticle clusters by surface ligand engineering[J]. 中国物理B, 2016, 25(7): 77504-077504.

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[J]. Chin. Phys. B, 2016, 25(7): 77504-077504.

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Control of the interparticle spacing in superparamagnetic iron oxide nanoparticle clusters by surface ligand engineering

Control of the interparticle spacing in superparamagnetic iron oxide nanoparticle clusters by surface ligand engineering

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