Plasma-Activated TiO2 Coatings for Visible-Light Sterilization
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Solution Overview
Problem
Current methods face challenges in achieving sustained photocatalytic titanium oxide(IV) coatings on polymer surfaces, particularly in the visible light range, which are essential for effective photosterilization of medical and food packaging materials, due to difficulties in permanent immobilization and sensitivity issues.
Innovation Solution
The development of photocatalytic titanium oxide(IV) coatings on polymer surfaces, activated with visible light, involves a three-stage process: surface activation with low-temperature plasma, synthesis of nanocrystalline titanium oxide(IV) using a suspension, and surface modification with specific organic compounds, ensuring durable and effective photocatalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If titanium oxide(IV) is applied in the form of powders, solutions or colloidal layers at mineral surfaces, then photocatalytic activity is achieved, but the possibility of application on polymer surfaces is significantly reduced
Solution Approach 1:
The polymer surface undergoes preliminary plasma activation treatment before TiO2 coating application. This activation creates oxygen-containing functional groups and increases surface energy, preparing the surface to better accept and retain the TiO2 coating, thereby enabling sustained coating stability on polymer surfaces
Solution Approach 2:
Organic compounds act as intermediaries between the polymer surface and TiO2 coating. These compounds are first applied to the plasma-activated surface, then TiO2 is deposited on top, creating a stable layered structure that ensures sustained coating adhesion and prevents coating detachment
2Reliability
If conventional antimicrobial agents are used, then antimicrobial effect is achieved, but resistance of pathogens increases
Solution Approach 1:
The patent replaces conventional chemical antimicrobial agents with a photocatalytic system. Instead of using chemicals that pathogens can develop resistance against, the system uses light-activated TiO2 to generate Reactive Oxygen Species that physically damage microbial cells, eliminating the mechanism for resistance development
3Use of energy by moving object
If titanium oxide(IV) coatings are applied on polymer surfaces, then photocatalytic activity is achieved, but sensitization to visible light range is insufficient
Solution Approach 1:
The patent modifies the optical properties of TiO2 by incorporating organic compounds that extend light absorption into the visible range. This parameter change allows the coating to be activated by visible light while maintaining photocatalytic activity through the generation of Reactive Oxygen Species
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 resulting coatings exhibit high photocatalytic and photosterilizing activity, capable of generating Reactive Oxygen Species upon light exposure, effectively degrading microorganisms and extending activity into the visible light range, making them suitable for sterilization of medical and food packaging materials.
Implementation Method 1
The activation process of the polymer surfaces by low-temperature plasma technique is well known and described in the literature
Implementation Method 2
As a result of the activation process, many oxygen-containing functional groups are generated at the surface of polymeric material in the presence of oxygen, such as hydroxyl group (-OH), carboxyl group (-COOH), carbonyl group (-C=O)
Implementation Method 3
The present invention provides photocatalytic titanium oxide(IV) coatings on polymer surfaces, activated with visible light
Implementation Method 4
The resulting coatings exhibit high photocatalytic and photosterilizing activity, capable of generating Reactive Oxygen Species upon light exposure, effectively degrading microorganisms
Data Source
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AI summary
The invention relates to visible-light active photocatalytic coatings of titanium oxide (IV) on polymer surfaces, characterized in that are applied to a substrate which is the organic polymer material used in medicine, food and pharmaceutical packaging, and the coating is nanocrystalline titanium oxide (IV) or nanocrystalline titanium oxide (IV) surface-modified with organic compound. The invention also includes a method for the preparation of photocatalytic coatings of titanium oxide (IV) according to the invention, comprising the step of activating the surface of a polymeric material with low-temperature plasma technology, and then the synthesis of nanocrystalline titanium oxide (IV) coating and the modification of the surface layer with organic compounds. The invention also relates to the application of photocatalytic coating of titanium oxide (IV) according to the invention for sterilization of plastic elements used in medicine, food and pharmaceuticals packaging and application to production of selected products from the group consisting of: photosterilizing materials, photobactericidal, photofungicidal, photocatalytic materials.