MXene Aligned Film for Electromagnetic Shielding
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Solution Overview
Problem
MXene films used for electromagnetic shielding reflect electromagnetic waves, potentially damaging electronic devices, and as electrodes, their capacity decreases with thickness due to layer alignment issues during film formation under normal gravity or with binders.
Innovation Solution
An aligned film with MXene layers non-parallel to the film faces, where magnetic nanoparticles are carried on the surface or between layers, allowing alignment via a weak magnetic field, enhancing electromagnetic shielding and electrode performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If MXene is molded into a film shape under normal gravity, then the film can be formed easily, but the layers align parallel to the film plane causing high electromagnetic wave reflection
Solution Approach 1:
The patent applies vertical alignment of MXene layers perpendicular to the film plane, changing the orientation from the conventional parallel arrangement. This dimensional reorientation allows electromagnetic waves incident on the film surface to interact with the layered structure in a way that reduces reflection and enhances absorption, while the layers remain within the film structure.
Solution Approach 2:
The patent changes the orientation parameter of MXene layers from parallel to perpendicular relative to the film plane. This parameter change fundamentally alters the interaction between electromagnetic waves and the material structure, reducing harmful reflection while maintaining the film's protective function.
2Object-affected harmful factors
If MXene film thickness is increased for electromagnetic shielding, then shielding effect is improved, but reflected electromagnetic waves damage electronic devices
Solution Approach 1:
The patent converts the harmful reflection of electromagnetic waves into beneficial absorption. By vertically aligning the MXene layers, the structure promotes multiple internal reflections and absorption pathways, transforming the previously harmful reflected energy into absorbed energy that protects electronic devices from electromagnetic interference.
3Quantity of substance
If MXene electrode thickness is increased for higher capacity, then more material is available for ion storage, but ion transport between layers is hindered
Solution Approach 1:
The patent reorients MXene layers vertically to create perpendicular pathways for ion transport. This dimensional change allows ions to access multiple layers simultaneously through the vertical arrangement, maintaining high ion transport speed even as electrode thickness and capacity increase.
4Strength
If binders are used to form MXene films, then film structural integrity is improved, but layer alignment control is lost
Solution Approach 1:
The patent replaces mechanical binder-based film formation with a magnetic field-guided self-assembly process. Magnetic nanoparticles embedded in the MXene structure respond to external magnetic fields, enabling precise control of layer alignment without requiring organic binders, thus achieving both structural integrity and alignment precision.
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 aligned film reduces electromagnetic wave reflection and maintains high capacity even with increased thickness, effectively addressing the issues of electromagnetic interference and electrode functionality.
Implementation Method 1
applying a magnetic field to align the plurality of layers parallel to a predetermined direction
Data Source
AI summary
An aligned film having first and second faces opposed to each other, the aligned film having (a) a plurality of layers aligned non-parallel to the first and second faces between the faces of the aligned film, each layer having a crystal lattice represented by: Mn+1Xn (wherein M is at least one metal of Group 3, 4, 5, 6, or 7; X is a carbon atom, a nitrogen atom, or a combination thereof; and n is 1, 2, or 3), each X is positioned within an octahedral array of M, and at least one of two opposing surfaces of each said layer have at least one modifier or terminal T selected from a hydroxy group, a fluorine atom, an oxygen atom, and a hydrogen atom; and (b) magnetic nanoparticles carried on a layer surface and/or between two adjacent layers of the plurality of layers.