Mechanism of Magnetic Relaxation Switching Sensing
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- 作者：Changwook Min ; Huilin Shao ; Monty Liong ; Tae-Jong Yoon ; Ralph Weissleder ; Hakho Lee
- 刊名：ACS Nano
- 出版年：2012
- 出版时间：August 28, 2012
- 年：2012
- 卷：6
- 期：8
- 页码：6821-6828
- 全文大小：432K
- 年卷期：v.6,no.8(August 28, 2012)
- ISSN：1936-086X
文摘
Magnetic relaxation switching (MRSw) assays that employ target-induced aggregation (or disaggregation) of magnetic nanoparticles (MNPs) can be used to detect a wide range of biomolecules. The precise working mechanisms, however, remain poorly understood, often leading to confounding interpretation. We herein present a systematic and comprehensive characterization of MRSw sensing. By using different types of MNPs with varying physical properties, we analyzed the nature and transverse relaxation modes for MRSw detection. The study found that clustered MNPs are universally in a diffusion-limited fractal state (dimension of 2.4). Importantly, a new model for transverse relaxation was constructed that accurately recapitulates observed MRSw phenomena and predicts the MRSw detection sensitivities and dynamic ranges.