Graphitic nanocomposites in solid state matrices and methods for making same
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Solution Overview
Problem
Existing methods face challenges in incorporating graphitic nanomaterials like carbon nanotubes and graphene into solid state matrices without aggregation, which limits their high concentration and effective electromagnetic (EM) properties for applications such as antennas and shielding devices.
Innovation Solution
Functionalizing graphitic nanomaterials with moieties similar to the solid state matrix building blocks and mixing them with sol-gel chemicals, allowing in situ formation of a homogeneous nanocomposite that entraps and covalently links the nanomaterials, preventing aggregation and enhancing EM properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If graphitic nanomaterials are incorporated into solid state matrices at high concentrations, then EM properties are enhanced, but aggregation occurs which limits effectiveness
Solution Approach 1:
The patent uses functional groups as intermediary components that bridge graphitic nanomaterials and the solid state matrix. These functional groups (such as carboxyl, hydroxyl, or amine groups) are introduced onto the nanomaterial surfaces through oxidation or chemical treatment, enabling them to form hydrogen bonds or covalent connections with the matrix polymer chains. This intermediary layer prevents direct aggregation of nanomaterials while maintaining high concentrations, thereby enhancing EM properties without compromising compositional stability.
Solution Approach 2:
The patent alters the surface chemical parameters of graphitic nanomaterials through oxidation treatments (e.g., acid treatment with HNO3/H2SO4) to introduce polar functional groups. This parameter change in surface chemistry transforms the nanomaterials from hydrophobic, aggregation-prone surfaces to hydrophilic, matrix-compatible surfaces. The modified surface parameters enable better dispersion and stable integration into the solid state matrix at high concentrations, resolving the contradiction between quantity and stability.
2Adaptability or versatility
If graphitic nanomaterials are dispersed in liquid dispersions, then EM properties can be studied, but practical application requires solid state matrices
Solution Approach 1:
The patent performs preliminary functionalization of graphitic nanomaterials before incorporating them into the solid state matrix. By pre-introducing functional groups onto the nanomaterial surfaces through oxidation or grafting reactions, the materials are prepared in advance to ensure compatibility with the matrix. This preliminary action prevents aggregation during matrix formation and ensures reliable maintenance of EM properties in the final solid state composite, enabling practical applications.
Solution Approach 2:
The patent creates a composite material system combining graphitic nanomaterials with a solid state matrix (such as polymer or ceramic). The functionalized nanomaterials serve as conductive fillers within the matrix, forming a hybrid composite that leverages the EM properties of nanomaterials and the structural stability of the matrix. This composite approach enables practical applications while maintaining reliability of EM properties in the solid state configuration.
3Strength
If nanomaterials are aggregated in solid matrix, then mechanical strength may increase, but EM properties are compromised
Solution Approach 1:
The patent applies local quality modification by introducing functional groups specifically at the surface regions of graphitic nanomaterials, while maintaining the bulk sp2-bonded structure intact. This localized functionalization ensures that the nanomaterials maintain their intrinsic EM properties (determined by the bulk structure) while gaining improved interfacial compatibility with the matrix (at the surface). The functionalized surfaces enable strong local bonding with the matrix, providing mechanical strength without compromising the bulk EM properties.
Solution Approach 2:
The patent effectively segments the nanomaterial-matrix interface by introducing functional groups that create distinct interfacial regions. These functional groups form a transition layer between the nanomaterial core and the matrix, segmenting the interface into zones with different properties: the core maintains EM functionality, the interface provides mechanical bonding. This segmentation allows simultaneous optimization of both mechanical strength and EM properties.
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
Enables the production of graphitic nanocomposites with higher concentrations of nanomaterials, maintaining their unique EM properties and increasing mechanical stability, durability, and versatility for various applications including EM shielding and amplification.
Implementation Method 1
The graphitic nanomaterials may be functionalized, such as by covalent bonding, with a moiety similar to the building blocks of the solid state matrices
Implementation Method 2
The in situ formation of the sol-gel solid state matrices during curing entraps and/or covalently links with the graphitic nanomaterials through the network growing process
Implementation Method 3
Graphene possesses unique electronic properties, such as the quantum hall effect in condensed-matter materials and excellent mobility of charge carriers due to its unique π-conjugated carbon monolayer 2D system
Data Source
AI summary
A composition and method for fabricating graphitic nanocomposites in solid state matrices is presented. The process for fabricating graphitic nanocomposites in solid state matrices may include selecting one or a mixture of specific graphitic nanomaterials. The graphitic nanomaterial(s) may be functionalizing with a moiety similar to the building blocks of the solid state matrices. The functionalized graphitic nanomaterials are mixed with the building blocks of the solid state matrices. The mixture may be cured, which causes in situ formation of the sol-gel solid state matrices that entraps and/or covalently links with the graphitic nanomaterials during the network growing process. This process allows the nanomaterials to be introduced into the matrices homogeneously without forming large aggregations.