3D Printing Resin with Light-Scattering Nanoparticles
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Solution Overview
Problem
3D printing with resins often requires long cure times under UV light, which can lead to over-curing, brittleness, and degradation of polymers, and existing methods lack efficient solutions for mitigating these issues.
Innovation Solution
Incorporating light-scattering and wavelength-shifting metal nanoparticles into 3D printing compositions to scatter and down-convert UV radiation, accelerating the polymerization process and reducing the risk of over-curing, while also providing antimicrobial properties and improved tensile strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If UV radiation is used to cure resin in 3D printing, then the resin solidifies and forms a solid part, but the curing process becomes slow and may lead to over-curing
Solution Approach 1:
Metal nanoparticles act as intermediaries between UV light and the resin polymerization process. They absorb UV radiation and convert it to visible light through photoluminescence, which then triggers polymerization. This two-step light conversion process enables more efficient and controlled curing compared to direct UV exposure.
Solution Approach 2:
The invention changes the wavelength parameter of the curing light from UV to visible light range. By using metal nanoparticles with specific photoluminescence properties, the curing process operates at different energy levels, enabling faster polymerization while preventing over-curing effects associated with prolonged UV exposure.
2Reliability
If prolonged UV exposure is used to ensure complete curing, then the resin cures thoroughly, but the product becomes brittle and degraded
Solution Approach 1:
Metal nanoparticles serve as a protective intermediary that mediates the energy transfer from light to the resin. Their photoluminescence conversion allows controlled polymerization at visible light wavelengths, preventing the excessive energy input from direct UV exposure that causes chain scission and brittleness.
Solution Approach 2:
The invention converts potentially harmful UV radiation into beneficial visible light through the photoluminescence of metal nanoparticles. This wavelength transformation protects the polymer chains from UV-induced degradation while still providing sufficient energy for complete curing.
3Reliability
If UV light is used for curing, then the resin hardens, but the UV light degrades certain polymers by breaking chemical bonds
Solution Approach 1:
Metal nanoparticles act as a protective intermediary layer that absorbs harmful UV photons and re-emits them as lower-energy visible photons. This prevents direct UV-photon interactions with polymer chains, eliminating the primary mechanism of UV-induced polymer degradation while maintaining curing effectiveness.
Solution Approach 2:
The invention transforms harmful UV radiation into beneficial visible light through photoluminescence conversion in metal nanoparticles. This wavelength shifting process converts a degrading factor into a curing-enabling factor, protecting polymer integrity while ensuring complete polymerization.
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 use of metal nanoparticles results in faster curing, stronger prints with higher tensile strength, improved accuracy, and antimicrobial properties, reducing waste and support requirements, and protecting prints from UV degradation.
Implementation Method 1
the 3D printing compositions containing nanoparticles scatter incoming UV light throughout printed layers of the 3D printing compositions
Implementation Method 2
light-scattering and wavelength-shifting nanoparticles... scatter and down-convert UV radiation into longer wavelength and less energetic (and less destructive) radiation
Implementation Method 3
the 3D printing compositions containing nanoparticles accelerate the polymerization process
Data Source
AI summary
Disclosed are embodiments of 3D printing compositions that incorporate light scattering and wavelength-shifting metal nanoparticles, and systems and methods of using the 3D printing compositions. In some embodiments, the 3D printing compositions containing metal nanoparticles cure faster upon exposure to UV radiation. In some embodiments, the 3D printing compositions containing metal nanoparticles scatter incoming UV light throughout printed layers of the 3D printing compositions. It is proposed that metal nanoparticles produced by high energy methods possessing smooth spherical morphology and narrow size distributions can be integrated into 3D printing compositions to mitigate the risk of over-curing due to the light-scattering and/or down-shifting effect of the nanoparticles. A method for adding the nanomaterials to the 3D printing compositions in a non-interruptive process is also disclosed.