Conductive Fibrous Sheets Nanoparticle Coating Surfactant Removal
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Solution Overview
Problem
Existing conductive materials face challenges in achieving high conductivity while maintaining mechanical stability and simplicity in processing, due to issues like surfactant removal and additive incorporation, which increase complexity and cost in thin-film applications.
Innovation Solution
Conductive fibrous sheets are developed by coating conductive nanoparticles onto fibers, using a conformal coating approach that eliminates the need for surfactant removal and additive adjustment, allowing for high conductivity and mechanical flexibility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If surfactants are used to disperse nanomaterials in solution, then the nanomaterials can be deposited as separated particles, but the surfactants are insulating and limit charge transfer between nanomaterials
Solution Approach 1:
The patent removes surfactants from the ink formulation entirely, using alternative dispersants that do not interfere with charge transfer. This extraction of the harmful insulating component resolves the contradiction by maintaining dispersion capability through non-insulating alternatives.
Solution Approach 2:
The patent changes the chemical parameters of the dispersant system by using specific polymers or small molecules with controlled hydrophilic-lipophilic balance, replacing traditional insulating surfactants with compounds that maintain dispersion while allowing charge transfer.
2Reliability
If extensive washing and chemical displacement are used to remove surfactants, then charge transfer is improved, but mechanical detachment of the film from substrate occurs
Solution Approach 1:
By eliminating surfactants from the formulation before deposition, the patent removes the need for subsequent removal steps that would compromise adhesion. The harmful removal process is extracted from the workflow entirely.
Solution Approach 2:
The patent performs dispersion optimization in advance using alternative dispersants that do not require removal, preventing the need for washing steps that would detach the film from the substrate.
3Strength
If polymer binders or adhesives are used to improve binding of nanomaterials to substrates, then mechanical stability is improved, but film conductivity decreases further
Solution Approach 1:
The patent uses minimal or no polymer binders, relying instead on direct nanomaterial-substrate interactions and optimized dispersant systems. This eliminates the conductivity-reducing effect of extensive polymer usage while maintaining sufficient mechanical binding.
Solution Approach 2:
The patent creates a composite system where nanomaterials, dispersants, and minimal binder work together synergistically, replacing the need for extensive polymer usage with a balanced composite formulation that maintains both adhesion and conductivity.
4Manufacturing precision
If various additives are incorporated in ink to tune rheology properties, then coating quality is improved, but the insulating additives decrease the final film conductivity
Solution Approach 1:
The patent changes the rheological parameters through careful selection of dispersant concentration and type, and controlled solvent composition, rather than adding multiple insulating additives. This maintains coating quality while preserving conductivity.
Solution Approach 2:
The patent removes insulating additives from the ink formulation, using only conductive or neutral components for rheology control, thereby eliminating the conductivity-decreasing effect of additive incorporation.
5Manufacturing precision
If the ink surface tension is matched with substrates and viscosity is adjusted, then coating defects are avoided, but the complexity of solution processing increases
Solution Approach 1:
The patent optimizes surface tension and viscosity through selective use of solvents and dispersants with inherent appropriate properties, rather than adding multiple rheology modifiers. This achieves defect-free coating while minimizing processing complexity.
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 approach results in conductive sheets with low sheet resistance, high specific capacitance, and stable cycling life, suitable for applications like supercapacitors and batteries, with improved mechanical properties and reduced processing complexity.
Implementation Method 1
Conductive materials are dispersed in solution and the solution is applied to a surface of a fibrous sheet to couple the conductive materials to fibers on the surface and form a conductive layer thereon
Data Source
AI summary
As consistent with various embodiments, an electronic device includes a fibrous material having a conductive coating thereon. The conductive coating includes conductive nanoparticles coupled to fibers in the fibrous material. The structure is implemented in connection with a variety of devices, such as a capacitive device or a battery. Other embodiments are directed to forming conductive fibrous sheets, in dispersing a nanomaterial in a solution and applying the solution to a fibrous sheet, such as commercial paper, to form a conductive sheet.