Composite Cellulose Nanosheet Transparency Strength
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Solution Overview
Problem
Current optical materials, such as reinforced plastic composites with glass fibers, suffer from poor transparency and surface flatness due to refractive index differences and thermal instability, limiting their use as glass replacements.
Innovation Solution
A composite cellulose nanosheet is manufactured by preparing a dispersion of cellulose nanofibers and nanocrystals, crosslinking them with a crosslinking agent like epichlorohydrin, and sandwiching the nanosheet support between glass plates for pressing and drying, resulting in a material with enhanced transparency and strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If reinforced plastic composite material with glass fiber is used, then strength is improved, but transparency deteriorates
Solution Approach 1:
The patent uses cellulose nanofibers and cellulose nanocrystals as reinforcement materials that have the same refractive index as the cellulose matrix, creating a homogeneous composite material. This homogeneity eliminates light scattering at interfaces, maintaining high transparency while providing strength reinforcement, directly resolving the contradiction between strength improvement and transparency deterioration.
2Strength
If glass fiber reinforcement is used, then strength is improved, but surface flatness deteriorates
Solution Approach 1:
The patent employs ultrathin cellulose nanofibers and nanocrystals that can conform to the matrix structure without creating surface irregularities. These nanoscale reinforcements form a flexible, uniform network within the matrix that maintains surface flatness while providing strength, avoiding the surface roughness problems associated with conventional glass fiber reinforcements.
3Ease of operation
If plastic materials are used to replace glass, then ease of operation is improved, but thermal stability deteriorates
Solution Approach 1:
The patent creates a composite material system where cellulose nanofibers and nanocrystals are embedded in a cellulose matrix. This composite structure combines the flexibility and ease of operation of plastic materials with the thermal stability of crystalline cellulose structures, achieving both improved operability and maintained thermal resistance through the synergistic composite architecture.
4Strength
If glass fiber reinforcement is used, then strength is improved, but turbidity characteristics deteriorate
Solution Approach 1:
The patent achieves excellent turbidity characteristics by using cellulose nanofibers and nanocrystals as reinforcements that match the refractive index of the cellulose matrix. This refractive index matching creates optical homogeneity throughout the material, preventing light scattering and maintaining high transparency even with reinforcement added, thus improving strength without compromising turbidity characteristics.
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 composite cellulose nanosheet achieves transmittance of 60% or greater in the visible light region and tensile strength of 180 MPa or greater, addressing the limitations of existing optical materials.
Implementation Method 1
contacting the nanosheet support with a crosslinking agent, for example to thereby crosslink the cellulose nanofiber and the cellulose nanocrystal
Implementation Method 2
The composite cellulose nanosheet may have a transmittance of 60% or more in a wavelength region of 360 nm to 740 nm
Data Source
AI summary
Disclosed are a composite cellulose nanosheet with excellent transparency and strength and manufacturing method thereof. The manufacturing method of a composite cellulose nanosheet includes: preparing a dispersion including a cellulose nanofiber and a cellulose nanocrystal; preparing a nanosheet support with the dispersion; contacting the nanosheet support with a crosslinking agent; and placing the nanosheet support that has contacted the crosslinking agent between two sheets of barrier materials such as two sheets of glass plate.