Tungsten Oxide and Copper Gluconate Coating for Indoor Light Antibacterial Action
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Solution Overview
Problem
Photocatalysts, particularly titanium oxide, exhibit limited photocatalytic activity under indoor LED lighting, and their effectiveness in removing VOCs and suppressing bacteria and viruses is hindered by the need for light exposure and inadequate material selection, leading to inhibited performance.
Innovation Solution
A photocatalyst coating liquid containing tungsten oxide particles, copper gluconate, and a dispersant in a specific weight ratio, which forms a coating layer providing antibacterial performance in dark environments and deodorization and antibacterial performance in bright environments, leveraging the synergistic effects of copper ions and photocatalytic activity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If titanium oxide particles are used as photocatalyst, then photocatalytic activity under ultraviolet light is achieved, but photocatalytic activity under indoor LED lighting is insufficient
Solution Approach 1:
The patent combines tungsten oxide particles with copper gluconate to create a composite photocatalyst system. Tungsten oxide provides broader light absorption including visible light range, while copper gluconate enhances antibacterial activity. This composite approach allows the photocatalyst to function effectively under both ultraviolet and indoor LED lighting conditions, resolving the contradiction between maintaining photocatalytic activity and adapting to different light sources.
Solution Approach 2:
The patent changes the chemical composition parameters of the photocatalyst from pure titanium oxide to a mixture containing tungsten oxide particles and copper gluconate. Specifically, it controls the weight ratio of copper gluconate to photocatalyst particles between 2/100 and 20/100, optimizing the balance between light absorption capability and antibacterial performance across different lighting conditions.
2Reliability
If photocatalyst is mixed with another material to improve function, then function enhancement is achieved, but photocatalyst performance may be inhibited if material selection is inappropriate
Solution Approach 1:
The patent uses copper gluconate as an intermediary substance that bridges the gap between tungsten oxide particles and the target bacteria. Copper gluconate releases copper ions that act as a mediator to enhance antibacterial activity, while the tungsten oxide provides the photocatalytic framework. This careful selection of intermediary material prevents performance inhibition while achieving function enhancement.
Solution Approach 2:
The patent precisely controls the concentration parameter of copper gluconate, maintaining its weight ratio to photocatalyst particles between 2/100 and 20/100. This parameter optimization ensures sufficient copper ion release for enhanced antibacterial function while preventing excessive copper content that could inhibit photocatalyst activity or cause unwanted side effects.
3Reliability
If photocatalyst coating amount is increased to improve effectiveness, then photocatalytic performance is enhanced, but time required to exert effects increases due to light intensity balance
Solution Approach 1:
The patent changes the compositional parameters of the photocatalyst coating by incorporating copper gluconate at optimized concentrations (weight ratio 2/100 to 20/100 relative to photocatalyst particles). This composition optimization enhances the antibacterial activity per unit of coating material, allowing effective performance at lower coating amounts and reducing the time required to achieve photocatalytic effects.
Solution Approach 2:
The composite structure of tungsten oxide particles combined with copper gluconate creates synergistic effects where copper ions provide immediate antibacterial activity while tungsten oxide provides sustained photocatalytic function. This dual-mechanism approach accelerates the overall effectiveness, reducing the time lag associated with photocatalyst activation and VOC removal.
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 photocatalyst coating layer demonstrates excellent antibacterial and deodorization performance in both dark and bright conditions, with the copper gluconate enhancing antibacterial action and maintaining photocatalytic activity without light exposure, while maintaining effective deodorization performance.
Implementation Method 1
Since tungsten oxide has a wider light absorption band than titanium oxide and exerts photocatalytic activity even under visible light including no ultraviolet light
Implementation Method 2
The photocatalyst coating layer has excellent antibacterial performance in a dark place... the copper gluconate enhancing antibacterial action and maintaining photocatalytic activity without light exposure
Data Source
AI summary
A photocatalyst coating liquid contains photocatalyst particles containing tungsten oxide particles, copper gluconate, a dispersant, and an aqueous medium. The weight ratio (Y/X) of the copper gluconate (Y) to the photocatalyst particles (X) in the photocatalyst coating liquid is 2/100 or more and 20/100 or less.