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文章编号:1672-6987(2026)02-0052-06;DOI:10. 16351/j. 1672-6987. 2026. 02. 008
王 镇,侯铭泽,万家齐* ,陈克正 (青岛科技大学 材料科学与工程学院,山东 青岛 266042)
摘 要:以多元醇法制备的分散性良好的Fe3O4纳米粒子为模板,通过层层自组装方法制备了聚乙 烯亚胺和岩藻多糖包覆的Fe3O4纳米粒子。通过透射电子显微镜、动态光散射和X射线光电子能谱 等手段证明所制备的复合 Fe3O4纳米粒子在水溶液中分散均匀并具有明确的核壳结构。磁共振性 能研究表明,聚电解质包覆层对 Fe3O4纳米粒子弛豫性能有显著影响。经过 5层聚电解质包覆, Fe3O4纳米粒子的纵向弛豫率 r1从 10. 12 L ·(mmol · s)−1 降至 0. 98 L ·(mmol · s)−1 ,横向弛豫率 r2从444. 9 L ·(mmol · s)−1 降至106. 8 L ·(mmol · s)−1 ,而r2/r1比值由43. 96增加到108. 98。
关键词:磁性纳米粒子;层层自组装;造影剂;弛豫性能
中图分类号:TQ 207+. 2 文献标志码:A
引用格式:王镇,侯铭泽,万家齐,等 . 层层自组装制备聚电解质包覆 Fe3O4纳米粒子及其弛豫性能[J]. 青岛科技大学学报(自然科学版),2026,47(2):52-57.
WANG Zhen, HOU Mingze, WAN Jiaqi, et al. Preparation of polyelectrolyte coated Fe3O4 nanoparticles by layer-by-layer self-assembly and their relaxometric properties[J]. Journal of Qing⁃ dao University of Science and Technology(Natural Science Edition),2026,47(2):52-57.
Preparation of Polyelectrolyte Coated Fe3O4 Nanoparticles by Layer-by-Layer Self-Assembly and Their Relaxometric Properties
WANG Zhen,HOU Mingze,WAN Jiaqi,CHEN Kezheng (College of Materials Science and Engineering, Qingdao University of Science and Technology, Qingdao 266042, China)
Abstract:In this paper, well-dispersed Fe3O4 nanoparticles prepared by polyol method were used as templates,and Fe3O4 nanoparticles coated by polyethyleneimine and fucoidan were pre⁃ pared by layer-by-layer self-assembly method. The prepared composite Fe3O4 nanoparticles were demonstrated by TEM, DLS and XPS to be uniformly dispersed in aqueous solution and to have a well-defined core-shell structure. Magnetic resonance performance studies showed that the polyelectrolyte coating layer had a significant effect on the relaxometric properties of Fe3O4 nanoparticles. After five layers of polyelectrolyte coating, the longitudinal relaxation rate (r1) of Fe3O4 nanoparticles decreased from 10. 12 L ·(mmol · s)−1 to 0. 98 L ·(mmol · s)−1 and the transverse relaxation rate (r2) decreased from 444. 9 L ·(mmol · s)−1 to 106. 8 L · (mmol · s)−1 , while the r2/r1 ratio increased from 43. 96 to 108. 98.
Key words:magnetic nanoparticles; layer-by-layer self-assembly; contrast agent; relaxometric properties
收稿日期:2025-06-28
基金项目:国家自然科学基金项目(51774089);中国石油科技创新基金研究项目(2017D-5007-0607).
作者简介:王 镇(1997—),男,硕士研究生 . * 通信联系人 .