ZnO-on-Silicate Platelet Composite for Safer UV Skin Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Commercially available zinc oxide nanoparticles in sunscreens suffer from poor dispersion, leading to consumer discomfort and safety concerns due to potential skin penetration and toxicity, while existing ZnO-SBA-15 nanocomposites do not adequately address these issues.
Innovation Solution
A ZnO/NSP composite is formed by adsorbing zinc oxide particles on the surface of silicate platelets, enhancing dispersion and reducing toxicity, achieved through a metal ion exchange reaction and dehydration of zinc hydroxide on silicate platelets.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If commercially available zinc oxide nanoparticles are used in sunscreens, then UV protection is provided, but poor dispersion occurs leading to consumer discomfort and safety concerns
Solution Approach 1:
The patent creates a composite material consisting of zinc oxide nanoparticles supported on mesoporous silica particles. This composite structure allows the ZnO to maintain its UV-blocking properties while the silica support provides excellent dispersion and stability, eliminating the aggregation problems of pure ZnO nanoparticles and the safety concerns associated with free nanoparticles.
Solution Approach 2:
The mesoporous silica acts as an intermediary carrier that holds the zinc oxide nanoparticles. The silica provides a stable support structure that prevents direct contact of free ZnO nanoparticles with skin, while still allowing the ZnO to perform its UV-blocking function. This intermediary structure resolves both the dispersion issue and the safety concern.
2Reliability
If high amounts of zinc oxide are used to ensure UV protection, then UV blocking is improved, but consumer discomfort due to heaviness and pallor increases
Solution Approach 1:
The mesoporous silica particles with their porous structure act as a thin film support that distributes the zinc oxide nanoparticles uniformly. This structure provides UV protection without the heaviness and pallor associated with high concentrations of bulk zinc oxide, as the porous structure allows for better light scattering at lower overall concentrations.
3Ease of operation
If zinc oxide nanoparticles are used to solve dispersion issues, then UV protection is maintained, but skin penetration and toxicity risks increase
Solution Approach 1:
The zinc oxide nanoparticles are nested within or on the surface of the larger mesoporous silica particles. This nested structure allows the ZnO to maintain good dispersion (inherited from the silica carrier) while being contained within a larger, safer structure that reduces skin penetration risk. The silica shell acts as a physical barrier.
Solution Approach 2:
The mesoporous silica serves as an intermediary between the zinc oxide nanoparticles and the skin. It maintains the dispersion benefits of nanoparticles while providing a safer interface with skin tissue, reducing direct contact and potential toxicity of free ZnO nanoparticles.
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 ZnO/NSP composite provides effective UV protection and antimicrobial properties with minimal skin penetration, offering improved dispersion and reduced irritation, making it safer and more comfortable for use in cosmetic compositions.
Implementation Method 1
dehydrating zinc hydroxide to form zinc oxide particles adsorbing on the silicate platelet
Implementation Method 2
zinc oxide particles adsorbing on the silicate platelet
Implementation Method 3
Zinc oxide is a physical sun blocker that covers the absorption spectrum from 290 to 380 nm
Implementation Method 4
The opaque particles such as minerals in sunscreen products are utilized to directly shield and block sunlight
Implementation Method 5
the ZnO/NSP composite may improve the properties of zinc oxide and effectively reduce the amount of zinc oxide used in skin protecting compositions
Data Source
AI summary
A method for skin protection by applying a zinc oxide-on-silicate platelet composite (ZnO/NSP composite) is formulated in a cosmetic composition, to the skin of a subject. The ZnO/NSP composite is made of silicate platelet and ZnO particles adsorbed thereon, in which the ZnO particles are created by the dehydration of Zn(OH)2 formed on the silicate platelet. The ZnO particles adhering on the silicate platelet can effectively improve the dispersibility of zinc oxide particles in water, and the average particle size can reach near nanometer size. Moreover, the ZnO/NSP composite exhibits better antimicrobial and UV light-absorbing properties than ZnO itself, and are not toxic or irritating to the skin.