分子内力
荧光
磁共振成像
生物物理学
绕固定轴旋转
荧光寿命成像显微镜
化学
聚电解质
核磁共振
飞秒
纳米技术
材料科学
聚合物
光学
立体化学
医学
物理
经典力学
生物
放射科
激光器
作者
Yongkang Yao,Peng Ding,Chenxu Yan,Yining Tao,Bo Peng,Weimin Liu,Junyou Wang,Martien A. Cohen Stuart,Zhiqian Guo
标识
DOI:10.1002/anie.202218983
摘要
Uniting photothermal therapy (PTT) with magnetic resonance imaging (MRI) holds great potential in nanotheranostics. However, the extensively utilized hydrophobicity-driven assembling strategy not only restricts the intramolecular motion-induced PTT, but also blocks the interactions between MR agents and water. Herein, we report an aggregation-induced emission luminogen (AIEgen)-mediated polyelectrolyte nanoassemblies (APN) strategy, which bestows a unique "soft" inner microenvironment with good water permeability. Femtosecond transient spectra verify that APN well activates intramolecular motion from the twisted intramolecular charge transfer process. This de novo APN strategy uniting synergistically three factors (rotational motion, local motion, and hydration number) brings out high MR relaxivity. For the first time, APN strategy has successfully modulated both intramolecular motion and magnetic relaxivity, achieving fluorescence lifetime imaging of tumor spheroids and spatio-temporal MRI-guided high-efficient PTT.
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