可调节的磁加热在La0.51Sr0.49MnO3和La0.51Dy0.045Sr0.445MnO3纳米粒子:依赖频率和幅度的行为
Mourad Smari1, Monica Viorica Moisiuc2, Mohammad Y Al-Haik3
1Center for Advanced Materials Research, Research Institute of Sciences and Engineering, University of Sharjah, Sharjah P.O. Box 27272, United Arab Emirates.
Nanomaterials (Basel, Switzerland)
|May 13, 2025
概括
化的矿化纳米颗粒显示在磁性高热中由于增强的异构性而降低了特定吸收率 (SAR). 优化纳米粒子尺寸和流体粘度是高效加热的关键.
科学领域:
- 材料科学 材料科学 材料科学
- 纳米技术纳米技术
- 生物医学工程 生物医学工程
背景情况:
- 矿化物纳米颗粒为磁热过热提供可调节的磁性特性.
- 高特定吸收率 (SAR) 对于有效的高热治疗至关重要.
研究的目的:
- 研究La0.51Sr0.49MnO3 (LSMO) 和Dy-doped LSMO纳米粒子的频率和振幅依赖的磁加热.
- 结合实验和理论方法来理解SAR行为.
- 优化纳米粒子设计,以增强磁性高温.
主要方法:
- LSMO和Dy-doped LSMO纳米颗粒的Sol-gel合成.使用Dy-doped的LSMO纳米颗粒.
- 使用X射线衍射 (XRD) 和扫描电子显微镜 (SEM) 进行表征.
- 在不同磁场强度和频率下的实验SAR评估.
- 基于尼尔和布朗的放松机制的理论建模.
主要成果:
- 死亡兴奋剂增加了磁性异构性,改变了放松动态并减少了SAR.
- 在受控磁场条件下测量了实验SAR值 (60-120 Oe,150-300 kHz).
- 理论模型预测了最大加热的最佳纳米粒子大小 (~18-20 nm) 和铁流体粘度.
结论:
- 在矿矿中染色兴奋剂对磁性高温症的SAR产生负面影响.
- 一个结合的实验和理论框架有助于设计高效的磁纳米粒子.
- 最佳的纳米粒子大小和铁流体粘度是最大限度地提高高热效率的关键参数.
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