Magnetic Relaxation Switch Detecting Boric Acid or Borate Ester through One-Pot Synthesized Poly(vinyl alcohol) Functionalized Nanomagnetic Iron Oxide
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- 作者：Guilong Zhang ; Shiyao Lu ; Junchao Qian ; Kai Zhong ; Jianming Yao ; Dongqing Cai ; Zhiliang Cheng ; Zhengyan Wu
- 刊名：ACS Applied Materials & Interfaces
- 出版年：2015
- 出版时间：August 5, 2015
- 年：2015
- 卷：7
- 期：30
- 页码：16837-16841
- 全文大小：344K
- ISSN：1944-8252
文摘
We developed a highly efficient magnetic relaxation switch (MRS) system based on poly(vinyl alcohol) functionalized nanomagnetic iron oxide (PVA@NMIO) particles for the detection of boric acid or borate ester (BA/BE). It was found that the addition of BA/BE induced the aggregation of PVA@NMIO particles, resulting in a measurable change in the T2 relaxation time in magnetic resonance measurements. The main mechanism was proposed that the electron-deficient boron atoms of BA/BE caused the aggregation of PVA@NMIO particles through covalent binding to the hydroxyl groups of PVA. This novel detection system displayed excellent selectivity, high sensitivity, and rapid detection for BA/BE. Thus, this system may provide a great application prospect for detection of BA/BE.