Doped Zinc Oxide Particles for Enhanced UVA Absorption
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Solution Overview
Problem
Current zinc oxide sunscreens have limitations in enhanced UVA absorption, which is crucial for effective protection against UV radiation-induced skin damage and skin aging.
Innovation Solution
A particulate zinc oxide with a cationic portion comprising 99% zinc, a first iron dopant portion, and a second dopant portion consisting of manganese and copper, where the weight percent of the second dopant portion is greater than twice that of the first iron dopant portion, enhancing absorption in the UVA spectrum.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional zinc oxide is used in sunscreens, then basic UV protection is provided, but UVA absorption is insufficient
Solution Approach 1:
The patent applies parameter changes by modifying the chemical composition of zinc oxide through doping with specific transition metal ions (Fe, Mn, Cu) in controlled ratios. The Fe:Mn:Cu weight ratio is specifically controlled to be between 1:1.5:1 and 1:3:1, which changes the optical parameters of the material to enhance UVA absorption while maintaining UVB protection, directly resolving the contradiction between basic protection and enhanced UVA capability
Solution Approach 2:
The patent creates a composite material system by incorporating multiple dopant elements (iron, manganese, and copper ions) into the zinc oxide lattice structure. This composite approach combines the UV-blocking properties of zinc oxide with the enhanced optical absorption characteristics of transition metal ions, achieving superior UVA protection that neither component could provide alone
2Reliability
If zinc oxide with enhanced UVA absorption is developed, then protection against UV-induced skin damage is improved, but formulation complexity increases
Solution Approach 1:
The patent merges multiple protective functions into a single doped zinc oxide particle. By incorporating Fe, Mn, and Cu ions simultaneously in specific ratios, the material provides both UVB and UVA protection in one component, eliminating the need for separate filters and simplifying the overall sunscreen formulation while enhancing comprehensive skin protection
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 described zinc oxide formulation achieves improved UVA absorption intensity and a higher Long-Short Absorbance Ratio, providing enhanced protection against UV-induced skin damage and aging.
Implementation Method 1
Zinc oxide is a particulate material that is useful as sunscreen, since it absorbs and scatters ultraviolet radiation
Implementation Method 2
The host lattice may be preferably selected from oxides, especially, for example, TiO2 and ZnO... Preferably the second component is selected from iron, chromium, manganese and gallium ions in the 3+state
Implementation Method 3
Zinc oxide is a particulate material that is useful as sunscreen, since it absorbs and scatters ultraviolet radiation
Data Source
AI summary
A particulate metal oxide includes a cationic portion that includes a zinc portion, a first iron dopant portion and a second dopant portion consisting of manganese and copper, where the zinc portion is about 99% by weight or more of the cationic portion, and the weight percent of the second dopant portion is greater than twice the weight percent of the first iron dopant portion.