rGO Coated Non-Conductive Substrates for Leak and Strain Detection
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Solution Overview
Problem
Existing methods for detecting leaks and strain deformation in non-conductive substrates, such as geomembranes and geosynthetic clay liners, face challenges with poor adherence and dispersion of graphene, leading to unreliable leak detection and strain sensing, especially in dry conditions and multi-layered systems.
Innovation Solution
A non-conductive substrate is partially coated with a paint comprising reduced graphene oxide with a surface area below 300 m²/g and a thermosetting polymer, which improves adherence and detection quality by forming a conductive network that is sensitive to strain deformations and leaks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If graphene is incorporated into the substrate to enable leak detection, then detection capability is improved, but adherence and dispersion quality deteriorate
Solution Approach 1:
The patent introduces reduced graphene oxide (rGO) as an intermediary material between the substrate and the detection system. The rGO is incorporated into a polymer matrix to form a composite coating that provides both adherence to the substrate and conductive pathways for leak detection, resolving the contradiction between detection capability and manufacturing quality
Solution Approach 2:
The patent changes the physical and chemical parameters of graphene by reducing graphene oxide to rGO, which improves its dispersion characteristics and adherence properties while maintaining electrical conductivity. This parameter transformation enables better integration into the substrate without compromising detection capability
2Reliability
If the substrate is coated with conductive material for leak detection, then detection reliability is improved, but the substrate's original properties are compromised
Solution Approach 1:
The patent creates a composite material system combining the original substrate with rGO-polymer composite coating. This composite structure maintains the substrate's mechanical integrity and original properties while adding conductive functionality through the rGO network, resolving the contradiction between detection reliability and composition stability
Solution Approach 2:
The conductive rGO material is applied as a coating layer on the substrate surface rather than mixing it throughout the bulk material. This localized application preserves the substrate's original composition and properties in the bulk while providing detection functionality at the surface where it is needed
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 coated substrate enhances the detection of leaks and strain deformations, increasing the lifetime of the substrates and providing reliable monitoring of their integrity, even in challenging conditions like earthquakes or wear.
Implementation Method 1
a paint comprising reduced graphene oxide... forming a conductive network that is sensitive to strain deformations and leaks
Implementation Method 2
For a circuit to be formed, an electrical conduction mechanism on the opposite side of the barrier to which the voltage is applied is required. Where an electrolyte, even a very weak one, is present under the barrier, sufficient current can be carried to form a circuit through the defect
Implementation Method 3
forming a conductive network that is sensitive to strain deformations and leaks
Data Source
Figure 1~2
Figure 3a~3b
AI summary
The present invention relates to a non-conductive substrate being at least partially coated with a paint comprising reduced graphene oxide and a thermosetting polymer, the non-conductive substrate being directly coated by the paint, a method for the manufacture of this coated non-conductive substrate, methods for detecting leaks or strain deformation and the uses of said coated non-conductive substrate.