UV Dosimeter with Oxygen-Permeable Barrier for Reusable Water Disinfection
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Solution Overview
Problem
Conventional solar disinfection (SODIS) systems face challenges in determining sufficient UV exposure for water disinfection, as existing methods lack a reliable and reusable indicator to ensure water safety for consumption.
Innovation Solution
A UV dosimeter with a UV-sensitive layer, protected by an oxygen-permeable and water-impermeable barrier, comprising a semiconductor material, UV-oxidizable dye, sacrificial electron donor, and matrix, which changes visual appearance upon sufficient UV exposure and reverts back with oxygen exposure, allowing for repeated use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a UV-sensitive layer is exposed to water for disinfection monitoring, then it can detect UV exposure in water treatment, but the UV-sensitive layer deteriorates due to water contact
Solution Approach 1:
The system is divided into separate functional components: a water-impermeable barrier layer that protects the UV-sensitive layer from water contact, while allowing UV radiation to pass through. This segmentation enables the UV-sensitive layer to maintain stability while still performing its detection function in water treatment applications.
Solution Approach 2:
A water-impermeable barrier acts as an intermediary between the UV-sensitive layer and the water environment. This barrier selectively transmits UV radiation while blocking water molecules, enabling indirect detection of UV exposure in water without direct contact between the sensitive layer and water.
2Measurement precision
If a UV dosimeter is designed for single-use to ensure accuracy, then measurement precision is maintained, but device complexity and cost increase due to disposal requirements
Solution Approach 1:
The dosimeter incorporates a reversible chemical system where the UV-oxidizable dye can be regenerated. After UV exposure causes color change, exposure to reducing agents restores the original state, allowing the dosimeter to be reused multiple times while maintaining measurement precision through controlled regeneration cycles.
Solution Approach 2:
The system utilizes reversible changes in the oxidation state of the UV-oxidizable dye as the active parameter. By controlling the oxidation-reduction cycles, the dosimeter can repeatedly transition between its detecting and regenerated states, enabling multiple measurement cycles without sacrificing precision.
3Ease of operation
If the UV-sensitive layer is made visible to indicate UV exposure, then ease of operation is improved through visual indication, but the layer becomes sensitive to visible light which may interfere with UV detection
Solution Approach 1:
The UV-oxidizable dye undergoes a color change in response to UV-induced oxidation, providing a clear visual indication of UV exposure. The color transition serves as the operational signal, allowing users to easily determine when sufficient UV dosing has been achieved without requiring complex instrumentation.
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 UV dosimeter provides a visual indication of sufficient UV exposure, ensuring water safety and enabling the reuse of the device, thus enhancing the effectiveness and reliability of SODIS systems.
Implementation Method 1
The UV-sensitive layer is accessible to both UV radiation and visible light... The UV-sensitive layer comprises a mixture of a semiconductor material, a UV-oxidizable dye... The oxidation state of the dye is visibly distinguishable from the reduction state of the dye. The sacrificial electron donor oxidizes when exposed to UV radiation.
Implementation Method 2
The semiconductor material has a band gap that corresponds to photon energy of the UV radiation.
Implementation Method 3
The barrier is permeable to oxygen but impermeable to water... allowing exposure of the UV-sensitive layer to oxygen.
Data Source
AI summary
The present disclosure teaches a UV dosimeter comprising a UV-sensitive layer and a barrier that protects the UV-sensitive layer. The barrier is permeable to oxygen but impermeable to water and, thus, protects the UV-sensitive layer from water while allowing exposure of the UV-sensitive layer to oxygen. The UV-sensitive layer is accessible to both UV radiation and visible light. The UV-sensitive layer comprises a mixture of a semiconductor material, a UV-oxidizable dye, a sacrificial electron donor, and a matrix material. The semiconductor material has a band gap that corresponds to photon energy of the UV radiation. The dye has both an oxidation state and a reduction state. The oxidation state of the dye is visibly distinguishable from the reduction state of the dye. The sacrificial electron donor oxidizes when exposed to UV radiation. The matrix provides structural integrity to the mixture.