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通过可调节磁性材料的热相过渡来控制液晶变异FePt纳米颗粒的磁性

Takehiro Yachi¹, Rina Sato¹, Masaki Matsubara^1,2

¹Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Katahira 2-1-1, Aoba-ku, Sendai 980-8577, Japan.

ACS applied nano materials

|August 14, 2025

概括

铁 (FePt) 纳米颗粒的表面修饰用树枝创建了热响应磁阵列. 这种自组装和热过渡允许对智能设备应用程序的磁性特性进行动态控制.

科学领域:

材料科学材料科学材料科学
纳米技术纳米技术
超分子化学超分子化学

背景情况:

铁 (FePt) 纳米粒子对磁性应用具有前景.
控制纳米粒子的自我组装和热行为对于先进材料至关重要.
登德里默化学为功能化纳米粒子表面提供了一条路径.

研究的目的:

为了准备具有热响应阵列结构的FePt纳米粒子.
为了研究dendronized FePt NPs的自我组装和热过渡行为.
探索树突修饰对磁性特性的影响.

主要方法:

FePt纳米颗粒通过配体交换和与液晶树突的化进行表面修饰.
使用红外光谱学,热重量测量分析,传输电子显微镜,小角度X射线散射 (SAXS) 和差分扫描热量测量 (DSC) 的表征.
使用超导量子干扰装置 (SQUID) 进行磁性性能测量.

主要成果:

在FePt纳米颗粒表面上成功地将树枝移植到FePt纳米颗粒表面得到证实.
凝结体FePtNP自组装成一个面中心立方体 (FCC) 格子结构.
FCC格子表现出一个热响应的相位过渡在100°C以上.
在热相过渡期间观察到磁性质的变化.

结论:

登德龙修饰引入了对FePt纳米粒子阵列的热响应.
自组装和可逆的热过渡使得对超分子结构和磁性行为的动态控制成为可能.
这些发现为使用功能化纳米粒子开发可调节的智能磁器件铺平了道路.

关键词:

在FePt纳米粒子中.树枝状的树枝状物液晶水晶的液体晶体是什么有机-无机混合材料有机-无机混合材料.自动组装的自动组装机

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