Core-Multishell Magnetic Nanoparticles for Room-Temperature Ferromagnetism
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Solution Overview
Problem
Current magnetic nanoparticles face challenges in controlling size and shape, particularly shell thickness, and maintaining ferromagnetic properties at the nanoscale, which limits their applications in fields like magnetic hyperthermia, energy storage, and data storage due to issues with interphase contamination and fundamental magnetic property changes.
Innovation Solution
A core-multishell magnetic nanoparticle structure is developed, comprising a core and multiple shells made of different magnetic materials with varying coercivity, allowing for precise control of size, shape, and magnetic properties, and the method involves sequential deposition of shells using surfactants and precursors in a dispersing medium to achieve desired properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If magnetic nanoparticles are reduced to nanoscale size, then their surface area to volume ratio increases and quantum effects are enhanced, but they lose their ability to behave like ferromagnetic materials at room temperature and instead behave like superparamagnetic materials
Solution Approach 1:
The patent employs a core-shell structure where a ferromagnetic core material is nested within a protective shell. The core maintains ferromagnetic properties while the shell provides stability and prevents superparamagnetic transition, effectively nesting the functional core within a stabilizing envelope.
Solution Approach 2:
The patent uses composite material structures combining different magnetic phases with distinct coercivity values. By integrating hard magnetic materials (high coercivity) with soft magnetic materials (low coercivity) in a core-shell configuration, the composite structure achieves room temperature ferromagnetism while maintaining nanoscale dimensions.
2Adaptability or versatility
If trimagnetic nanoparticles are prepared with multiple magnetic phases, then magnetic property tuning is possible, but controlling the size and shape of each magnetic phase and avoiding interphase contamination becomes difficult
Solution Approach 1:
The patent segments the nanoparticle into distinct core and shell regions with clearly defined magnetic phases. Each segment is optimized for specific magnetic properties, with the core providing one set of magnetic characteristics and the shell providing another, allowing independent control of each phase's properties.
Solution Approach 2:
The patent applies local quality by assigning different magnetic material compositions to different spatial regions of the nanoparticle. The core region contains one magnetic material with specific coercivity while the shell region contains another magnetic material with different coercivity, enabling localized optimization of magnetic properties.
3Ease of manufacture
If single phase magnetic nanoparticles are used, then the structure is simple and easy to manufacture, but the magnetic properties cannot be tuned for specific applications
Solution Approach 1:
The patent creates a universal core-shell template that can accommodate multiple magnetic material combinations. By maintaining a consistent structural framework while varying the magnetic materials in the core and shell, the design achieves multi-functionality across different applications while preserving ease of manufacture through standardized synthesis procedures.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The core-multishell structure enables magnetic nanoparticles to exhibit ferromagnetism at room temperature without an external field and high thermal stability, improving their magnetic properties and applicability in various applications by allowing for tailored properties and reproducible production.
Implementation Method 1
the magnetic nanoparticle exhibits ferromagnetism at room temperature without application of an external magnetic field
Implementation Method 2
high thermal stability
Data Source
AI summary
The present disclosure relates to magnetic nanoparticles having a core-multishell structure comprising at least two shells, and methods for their preparation.