Hydrophobic Membrane Coating for Low-Energy Fluid Release
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Solution Overview
Problem
Conventional micro-scale delivery devices face challenges in minimizing energy requirements for reservoir release due to high thermal conduction, especially with liquid reservoirs, which leads to energy loss and potential degradation of temperature-sensitive agents.
Innovation Solution
Incorporating a hydrophobic layer on the release membrane to repel liquids away from the membrane, forming an air pocket for thermal insulation and reducing thermal conduction, and using a hydrophilic surface to draw liquids away from the membrane.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a membrane is used to seal the reservoir, then controlled delivery of liquid is achieved, but thermal conduction through the liquid increases energy loss
Solution Approach 1:
A hydrophobic layer is introduced as an intermediary between the liquid and the membrane. This layer repels the liquid away from the membrane surface, creating a thermal barrier that reduces heat conduction from the membrane to the liquid, thereby minimizing energy loss while preserving the membrane's sealing function
Solution Approach 2:
The membrane surface is modified with a hydrophobic coating that creates locally different properties. The hydrophobic regions repel liquid and reduce thermal contact, while the membrane retains its overall sealing and controlled delivery capabilities. This localized modification addresses thermal conduction without compromising the membrane's primary function
2Volume of moving object
If the device size is reduced for patient comfort, then implantable and wearable applications are improved, but energy storage and power delivery are constrained
Solution Approach 1:
The invention converts the harmful effect of thermal conduction into a beneficial thermal insulation mechanism. By using the hydrophobic layer to repel liquid and create air pockets, the design transforms potential heat loss pathways into thermal barriers, reducing the energy required for reservoir release in miniaturized devices
3Temperature
If thermal conduction is high in liquid reservoirs, then heat transfer is efficient, but energy loss increases and temperature-sensitive agents degrade
Solution Approach 1:
The hydrophobic layer serves as a thermal intermediary that blocks direct heat transfer from the membrane to the liquid. This layer creates thermal insulation by repelling liquid and trapping air, thereby reducing energy loss while maintaining the ability to control heat transfer when needed
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
This approach minimizes energy consumption for reservoir release, reduces thermal conduction, and preserves the integrity of liquids by minimizing contact with the membrane, thereby reducing the risk of degradation.
Implementation Method 1
a hydrophobic layer disposed on an inside surface of the membrane
Implementation Method 2
forming an air pocket for thermal insulation and reducing thermal conduction
Implementation Method 3
using a hydrophilic surface to draw liquids away from the membrane
Data Source
AI summary
Embodiments of the present invention are directed to a liquid delivery apparatus. A non-limiting example of the apparatus includes a substrate including a cavity formed in a surface of the substrate. The apparatus can also include a membrane disposed on the surface of the substrate covering an opening of the cavity. The apparatus can also include a hydrophobic layer disposed on the membrane. The apparatus can also include a seal disposed between the membrane and the substrate, wherein the seal surrounds the opening of the cavity. The apparatus can also include an electrode layer coupled to the membrane.