3D Liquid Diode for Wearable Sweat Management
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Solution Overview
Problem
Existing wearable electronics face challenges in achieving permeability and multifunctionality, making it difficult to maintain a comfortable skin-device interface and ensure stable signal acquisition under sweating conditions.
Innovation Solution
A three-dimensional liquid diode system is developed, comprising a vertical and horizontal liquid diode layer with a liquid collector, which enables self-pumping of sweat and prevents backflow, integrated with a flexible electronic circuit board and permeable electrodes for bio-signal monitoring.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If wearable devices are made thin and conformal to achieve comfort, then device permeability and sweat management capability deteriorate
Solution Approach 1:
The invention transitions from traditional 2D flat wearable structures to a 3D vertically-stacked liquid diode architecture. Multiple liquid diode layers are stacked vertically with liquid collectors positioned between them, creating a three-dimensional fluid transport network that enables effective sweat management while maintaining thin overall device profile and skin conformality.
Solution Approach 2:
The invention implements a nested structure where liquid collectors are positioned between stacked liquid diode layers, creating a hierarchical arrangement. The liquid collectors are embedded within the vertical stack, allowing compact integration of multiple functional elements in a space-efficient manner that maintains both permeability and device thinness.
2Reliability
If liquid diodes are integrated for directional fluid transport, then device complexity increases
Solution Approach 1:
The invention divides the fluid transport system into discrete functional modules: individual liquid diode layers with specific channel structures, liquid collectors positioned between layers, and outlet structures. This segmentation allows each component to be optimized independently and simplifies the overall design and manufacturing process while maintaining reliable directional fluid transport.
Solution Approach 2:
The liquid diode structure serves multiple functions simultaneously: it provides directional fluid transport through asymmetric channel design, enables passive sweat management without external power, and maintains structural integrity for wearable applications. The same asymmetric structure that enables diode functionality also provides the mechanical framework for the device.
3Reliability
If permeable structures are used for sweat discharge, then signal acquisition stability deteriorates
Solution Approach 1:
The invention applies different properties to different regions: the liquid diode channels and collectors provide high permeability for sweat transport, while the electrode contact regions maintain stable electrical contact with the skin. This local differentiation allows simultaneous achievement of sweat management and reliable bio-signal acquisition without compromising either function.
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 3D liquid diode system provides superior permeability, maintaining a comfortable skin-device interface, ensuring stable signal acquisition, and reducing cutaneous discomfort during long-term wear, even under sweating conditions.
Implementation Method 1
a plurality of channels, each extending from the top surface to the bottom surface with a vertical hydrophilicity gradient
Implementation Method 2
a vertical hydrophilicity gradient
Implementation Method 3
a plurality of microstructures distributed on the lower surface with a horizontal structural gradient
Implementation Method 4
one or more first magnetic coupling elements integrated in the horizontal liquid diode layer; and one or more second magnetic coupling elements configured to couple to the one or more first magnetic coupling elements
Data Source
AI summary
The present invention provides a three-dimensional liquid diode comprising: a vertical liquid diode layer, a horizontal liquid diode layer disposed above the vertical liquid diode layer, and a liquid collector disposed between the horizontal liquid diode layer and the vertical liquid diode layer. The vertical liquid diode layer comprises: a top surface; a bottom surface; and a plurality of channels, each extending from the top surface to the bottom surface with a vertical hydrophilicity gradient. The horizontal liquid diode layer comprises: an upper surface; a lower surface; a plurality of microstructures distributed on the lower surface with a horizontal structural gradient and configured to couple with the plurality of channels of the vertical liquid diode layer; and a plurality of outlets evenly distributed around the plurality of microstructures, and extending from the upper surface to the lower surface. The liquid collector is coupled to the plurality of outlets.