Rear-Side UV Activation of Photocatalytic Composite Layers
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Solution Overview
Problem
Existing photocatalytically active surfaces require external UV radiation for activation, which is limited by sunlight availability and poses safety concerns, and existing solutions are not energy-efficient or practical for continuous contamination monitoring and mitigation.
Innovation Solution
A method where a photocatalytically active outer layer on a composite is activated from the rear side using a radiation-generating element within the composite, with integrated light-generating and sensing elements to determine contamination levels and activate the layer only when necessary, eliminating the need for external UV sources and ensuring energy efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If external UV radiation sources are used to activate the photocatalytically active outer layer, then the photocatalytic effect can be activated, but safety concerns arise due to harmful UV exposure and sunlight availability is limited
Solution Approach 1:
The patent inverts the conventional approach by placing the radiation-generating element inside the composite structure rather than externally. The radiation source is embedded within the composite, allowing UV radiation to be generated from the rear side of the photocatalytically active outer layer, thus activating the photocatalytic effect while preventing direct external UV exposure to users
Solution Approach 2:
The radiation-generating element is nested within the composite structure, specifically positioned behind the photocatalytically active outer layer. This nested arrangement allows the radiation source to be contained within the composite while still effectively activating the photocatalytic layer from the rear side
2Reliability
If continuous photocatalytic activation is maintained to ensure contamination mitigation, then contamination levels are continuously controlled, but energy consumption increases
Solution Approach 1:
The patent implements a feedback mechanism where sensors detect contamination levels on the photocatalytically active outer layer and transmit this information to a control unit. The control unit activates the radiation-generating element only when contamination exceeds a predetermined threshold, thereby maintaining effective contamination control while minimizing unnecessary energy consumption during clean periods
Solution Approach 2:
Instead of continuous activation, the system employs periodic activation based on contamination detection. The radiation-generating element is activated only during periods when contamination is detected, creating an on-demand operation pattern that reduces overall energy consumption while maintaining effective photocatalytic treatment when needed
3Ease of manufacture
If sunlight is used for UV radiation to activate the photocatalytically active outer layer, then no additional energy sources are needed, but activation is limited by time of day and weather conditions
Solution Approach 1:
The patent introduces an intermediary radiation-generating element that bridges the gap between sunlight dependency and continuous availability. This embedded radiation source can simulate UV radiation whenever needed, acting as an intermediary that provides photocatalytic activation independent of external sunlight conditions while maintaining the simplicity of the photocatalytic mechanism
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 method allows for continuous and energy-efficient activation of the photocatalytically active surface independently of sunlight, reducing contamination while minimizing exposure to harmful UV radiation and ensuring the surface is only activated when contamination exceeds a threshold, thereby enhancing practicality and safety.
Implementation Method 1
the element emits a radiation to activate the photocatalytically active outer layer. The at least one radiation-generating element can for example emit UV radiation that penetrates the photocatalytically active outer layer from the rear side and that also activates the photocatalytically active outer layer on the outer layer surface
Implementation Method 2
When irradiated with light in the near-UV wavelength, the chemical structure of the material triggers photocatalysis. This neutralizes and oxidatively breaks down organic contaminants into carbon dioxide and water
Data Source
AI summary
The invention relates to a method for activating a photocatalytically active, for example titanium-dioxide-containing, outer layer (13; 23) deposited on a composite, by means of at least one element (14; 24) generating a radiation, for example for generating ultraviolet radiation. The following method steps are comprised here: •a) forming the at least one radiation-generating first element (14; 24) within the composite; •b) forming at least one sensor (16; 26) within the composite; •c) recording an actual value of a physical variable characterizing luminous radiation by means of the at least one sensor (16; 26), wherein the luminous radiation is emitted by a light-generating second element (15; 25); •d) comparing the recorded actual value with a first threshold value within an evaluation device and switching on the at least one radiation-generating first element (14; 24) if the actual value is below or above the first threshold value.