Inorganic Nanoparticle UV-Protective Compositions
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Solution Overview
Problem
Current sunscreen compositions either contain organic compounds that generate free radicals and cause skin damage or use large inorganic particles that are opaque and leave a white cast on the skin, failing to effectively protect against the full range of UV radiation, particularly UVA radiation.
Innovation Solution
A UV-protective composition comprising nanoparticles of inorganic UV-absorbing agents such as barium titanate, bismuth oxide, bismuth vanadate, and doped zinc oxide, with a median particle diameter of up to 100 nm, providing broad-spectrum protection by absorbing UV radiation from 280 to 400 nm and maintaining transparency on the skin.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If large inorganic particles are used to block UV radiation, then UV protection is improved, but transparency and cosmetic appearance deteriorate due to white cast
Solution Approach 1:
The patent applies parameter changes by reducing the particle size of inorganic UV-absorbing agents from large particles to nanoparticles (median diameter up to 100 nm). This size parameter change enables the particles to absorb UV radiation effectively while being transparent to visible light, thus resolving the contradiction between UV protection and cosmetic appearance.
2Illumination intensity
If organic UV-absorbing compounds are used, then transparency is improved, but skin damage occurs due to free radical generation
Solution Approach 1:
The patent extracts the harmful property of organic compounds (free radical generation) by replacing them entirely with inorganic nanoparticles. The solution removes organic UV-absorbing compounds from the composition and uses only inorganic particles, thereby eliminating the source of free radicals while maintaining UV absorption capability.
3Reliability
If multiple UV-absorbing agents are combined to cover full UV spectrum, then broad-spectrum protection is improved, but composition complexity increases
Solution Approach 1:
The patent applies universality by using inorganic nanoparticles that can provide broad-spectrum UV protection (both UVA and UVB) through their inherent optical properties. The nanoparticles' size and material composition enable them to absorb multiple wavelengths of UV radiation, reducing the need for multiple different UV-absorbing agents and simplifying the overall composition.
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 effectively protects against both UVA and UVB radiation, offering broad-spectrum protection while being transparent on the skin, reducing the risk of skin damage and skin cancer, and avoiding the drawbacks of organic and large particle inorganic sunscreens.
Implementation Method 1
particles of inorganic UV-absorbing agents... absorbing UV radiation from 280 to 400 nm
Data Source
AI summary
Disclosed are compositions comprising inorganic UV-absorbing agents and the use of such compositions, in particular for protecting a subject or the surface of an inanimate object against a harmful effect of ultraviolet radiation.