Dual-Epoxy POSS Resin Composition for Low-Autofluorescence Curing
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Solution Overview
Problem
Nanoimprint lithography resins exhibit undesirable autofluorescence under violet and blue excitation wavelengths, leading to increased background noise and decreased signal-to-noise ratios in fluorescent-based bioanalytical applications.
Innovation Solution
A resin composition comprising a mixture of two different epoxy substituted polyhedral oligomeric silsesquioxane monomers, bis-(4-methylphenyl)iodonium hexafluorophosphate as a first initiator, and a second initiator selected from a free radical or cationic initiator, which reduces autofluorescence and enhances curing rate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional nanoimprint lithography resins are used, then the resin can be cured effectively, but the cured resin exhibits high autofluorescence under violet and blue excitation wavelengths, leading to increased background noise
Solution Approach 1:
The patent changes the chemical composition parameters of the resin by incorporating specific epoxy substituted polyhedral oligomeric silsesquioxane monomers with particular structural characteristics that inherently exhibit lower autofluorescence while maintaining curability. This parameter change in molecular structure resolves the contradiction between effective curing and low autofluorescence.
Solution Approach 2:
The patent uses a composite resin system combining epoxy substituted polyhedral oligomeric silsesquioxane monomers with specific initiators and additives. This composite material approach allows optimization of multiple properties simultaneously - the epoxy POSS monomers provide low autofluorescence while the initiator system ensures effective curing, thus resolving the technical contradiction.
2Object-generated harmful factors
If resins with low autofluorescence are used, then background noise is reduced, but the curing rate may be compromised
Solution Approach 1:
The patent introduces specific initiator systems as intermediaries that bridge the gap between low-autofluorescence monomers and effective curing. The initiators act as mediators that enable rapid polymerization of the epoxy POSS monomers without contributing to autofluorescence, thus maintaining both low background noise and high curing rate.
Solution Approach 2:
The patent optimizes the concentration and type of initiators in the resin composition to achieve fast curing kinetics. By adjusting initiator parameters (type, concentration, activation energy), the patent maintains high productivity while using low-autofluorescence monomer components.
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 resin composition achieves low or no autofluorescence under violet and blue excitation wavelengths, improving signal-to-noise ratios and enabling clearer signal resolution in fluorescent-based bioanalytical applications.
Implementation Method 1
The material is cured while the stamp is in place to lock the shape of the nanostructures in the material
Implementation Method 2
The cured resins generated with examples of the resin composition may exhibit no or low autofluorescence at fluorescent detection wavelengths of interest when exposed to violet or blue excitation wavelengths ranging from about 375 nm to about 500 nm
Data Source
AI summary
An example of an ultraviolet light curable resin composition includes a predetermined mass ratio of a first epoxy substituted polyhedral oligomeric silsesquioxane monomer and a second substituted polyhedral oligomeric silsesquioxane monomer, wherein the first and second epoxy substituted polyhedral oligomeric silsesquioxane monomers are different, and wherein the predetermined mass ratio ranges from about 3:7 to about 7:3; bis-(4-methylphenyl)iodonium hexafluorophosphate as a first initiator; a second initiator selected from the group consisting of a free radical initiator and a cationic initiator other than bis-(4-methylphenyl)iodonium hexafluorophosphate; a surface additive; and a solvent.