Carbon Quantum Dot UV Composition for Broad-Spectrum Dispersion
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Solution Overview
Problem
Existing UV absorbers, both inorganic and organic, face issues with dispersibility and wavelength coverage, necessitating multiple components and complex mixing for broad-spectrum protection.
Innovation Solution
A composition comprising carbon-based quantum dots, an aqueous solvent, and a surfactant, optionally with an oily or hydrophilic base, to enhance dispersibility and UV absorption across UVA and UVB ranges.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If inorganic UV reflectors (titanium oxide or zinc oxide) are used, then UV absorption function is improved, but dispersibility deteriorates over time due to powder aggregation
Solution Approach 1:
The patent changes the physical state of the UV absorber from bulk powder to ultrafine particles (100 nm or less), fundamentally altering the particle size parameter to prevent aggregation and improve dispersibility while maintaining UV absorption effectiveness
Solution Approach 2:
The patent creates a composite structure by coating ultrafine inorganic UV reflector particles with an organic UV absorber layer, combining the advantages of both material types to achieve improved dispersibility and broad-spectrum UV protection
2Reliability
If multiple organic UV absorbers are mixed to cover wide wavelength range, then UV absorption function is improved, but device complexity increases due to complicated mixing requirements
Solution Approach 1:
The patent uses a single organic UV absorber component that performs multiple functions by absorbing across both UVA and UVB wavelength ranges, eliminating the need for separate absorbers for each range and simplifying the formulation
Solution Approach 2:
The patent merges the functions of multiple UV absorbers into a single coating layer on the inorganic particles, achieving broad-spectrum protection through one integrated component rather than multiple separate 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 composition provides superior dispersibility and UV absorption function, addressing the limitations of existing UV absorbers by ensuring broad-spectrum protection with improved stability and ease of formulation.
Implementation Method 1
a carbon-based quantum dot... a superior UV absorption function is exhibited... absorbing, in particular, UVA (wavelength: 315 to 380 nm) and UVB (wavelength: 280 to 315 nm)
Implementation Method 2
A composition for UV absorption comprising a carbon-based quantum dot, an aqueous solvent, a surfactant, and an oily base
Data Source
AI summary
A composition for UV absorption has a superior UV absorption function, and is superior in dispersibility while absorbing, in particular, UVA (wavelength: 315 to 380 nm) and UVB (wavelength: 280 to 315 nm). The composition for UV absorption includes a carbon-based quantum dot, an aqueous solvent, a surfactant, and an oily base. Alternatively, the composition for UV absorption includes a carbon-based quantum dot, an aqueous solvent, and a hydrophilic base. A method for manufacturing the composition for UV absorption includes mixing an aqueous dispersion containing a carbon-based quantum dot and an aqueous solvent, a surfactant, and an oily base. A method for manufacturing the composition for UV absorption includes mixing an aqueous dispersion containing a carbon-based quantum dot and an aqueous solvent, and a hydrophilic base.