CIP/PDMS Composite Surface Treatment for Stretchable EM Noise Suppression
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Solution Overview
Problem
Existing wearable electronic device materials face a trade-off between electromagnetic noise suppression and stretchability, with high filler content improving noise suppression but reducing stretchability, and current methods for enhancing stretchability are costly and complex.
Innovation Solution
A method for preparing a highly stretchable CIP/PDMS composite by removing the surface oxide film from Carbonyl Iron Powders (CIP) and mixing them with Polydimethylsiloxane (PDMS), achieving partial interface bonding to increase stretchability while maintaining effective electromagnetic noise suppression.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If the volume percentage of CIP filler is increased to improve EM noise suppression efficiency, then the EM noise suppression efficiency is improved, but the stretchability of the composite material deteriorates
Solution Approach 1:
The patent removes the surface oxide film from CIP particles through chemical etching processes, extracting the harmful oxide layer that prevents proper interface bonding. This extraction enables the CIP particles to form strong bonds with the PDMS matrix, allowing high filler content (40 vol%) to be incorporated while maintaining stretchability of 165% or more.
Solution Approach 2:
The patent changes the surface chemical parameters of CIP particles by removing the oxide film, which fundamentally alters the interface bonding characteristics. This parameter change enables the composite to achieve both high filler content (improving EM noise suppression) and high stretchability, resolving the traditional trade-off between these two properties.
2Object-affected harmful factors
If the volume percentage of CIP filler is increased to achieve high EM noise suppression efficiency, then the EM noise suppression efficiency is improved, but the failure strain decreases
Solution Approach 1:
The oxide film removal process extracts the surface barrier that prevents effective stress transfer between filler and matrix. This enables the composite to maintain high failure strain (165% or more) even with 40 vol% CIP content, as the improved interface bonding allows the PDMS matrix to stretch effectively without premature failure.
Solution Approach 2:
The patent creates an optimized composite material system where surface-modified CIP particles are uniformly distributed in the PDMS matrix. This composite structure with improved interface bonding enables simultaneous achievement of high filler content (for EM noise suppression) and high failure strain, overcoming the limitations of conventional composite materials.
3Adaptability or versatility
If existing methods are used to enhance stretchability through structural engineering or expensive nanomaterials, then stretchability is improved, but the production cost increases and manufacturing complexity increases
Solution Approach 1:
The patent uses conventional, inexpensive CIP filler with a simple surface treatment process instead of expensive nanomaterials like carbon nanotubes, graphene, or MXene. The chemical etching method using common reagents provides a cost-effective solution that achieves 165% or more stretchability without requiring complex nanomaterial synthesis or specialized equipment.
Solution Approach 2:
The patent achieves enhanced stretchability through a simple parameter change - removing the oxide film from CIP surfaces - rather than through complex structural engineering. This straightforward surface modification approach significantly reduces manufacturing complexity while achieving the desired stretchability performance.
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 CIP/PDMS composite exhibits ultra-high stretchability of about 168% with 40 vol % filler content, overcoming the trade-off between noise suppression and stretchability, and maintaining EM noise reduction performance, suitable for next-generation wearable electronics.
Implementation Method 1
the EM noise suppression performance of the composite materials greatly depends on the magnetic and electrical properties of the filler
Implementation Method 2
CIP becomes the most commercially available filler because it may be produced inexpensively in large quantities using thermal decomposition and exhibits high saturation magnetization and permeability in the GHx band
Data Source
AI summary
Disclosed are a method for preparing a highly stretchable CIP/PDMS composite, a highly stretchable CIP/PDMS composite prepared thereby, and a highly stretchable electromagnetic (EM) noise suppressor including the same. The method for preparing the highly stretchable CIP/PDMS composite includes a first step of adding and mixing CIPs (Carbonyl Iron Powders) to and with a PDMS (Polydimethylsiloxane) solution to produce a first mixed solution; a second step of adding and mixing a curing agent to and with the first mixed solution to produce a second mixed solution; and a third step of transferring the second mixed solution into a mold and then curing the second mixed solution in the mold.