Capacitive LC Biosensor for Rapid Biological Detection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing liquid crystal biosensors are cumbersome, expensive, and time-consuming for detecting biological agents, requiring specialized equipment and being inefficient in identifying target biological agents.
Innovation Solution
A capacitive liquid crystal (LC) biosensor is developed, comprising a support board with a flow channel, electrodes, and an LC sensor array with organic LC phases and aqueous analyte phases, allowing for rapid, portable, and cost-effective detection of biological agents through capacitance changes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical measurement methods are used for liquid crystal biosensing, then detection capability is achieved, but the system becomes complex, expensive, and time-consuming requiring specialized equipment
Solution Approach 1:
The patent replaces optical measurement systems with an electrical field-based capacitive sensing system. Instead of using optical microscopes, light sources, and complex optical paths to detect liquid crystal orientation changes, the invention uses electrodes to apply an electric field and measure capacitance changes directly. This substitution of mechanical/optical systems with electrical field-based measurement simplifies the device architecture, reduces cost, and eliminates the need for specialized optical equipment while maintaining detection capability.
Solution Approach 2:
The patent changes the measurement parameter from optical properties (refractive index, birefringence) to electrical properties (capacitance). By measuring capacitance changes in the liquid crystal layer under an applied electric field, the system achieves the same biosensing function with simpler equipment. The capacitance measurement directly reflects liquid crystal orientation changes caused by analyte binding, providing a straightforward electrical readout that eliminates complex optical measurement requirements.
2Measurement precision
If traditional liquid crystal biosensors are used, then biological agent detection is possible, but the process becomes time-consuming and requires lab infrastructure
Solution Approach 1:
The patent replaces time-consuming optical measurement procedures with rapid electrical capacitance measurements. Capacitance can be measured electronically in seconds without requiring sample preparation for optical microscopy, alignment of optical components, or complex data processing. This electrical measurement approach maintains detection accuracy while reducing the detection time from minutes to seconds, enabling rapid point-of-care testing without lab infrastructure.
3Reliability
If existing biosensor systems are deployed, then biological detection function is provided, but the devices are cumbersome and not portable
Solution Approach 1:
The patent replaces bulky optical measurement systems with compact electrical field-based capacitive sensors. The sensing element consists of simple transparent electrodes (such as ITO) deposited on glass or flexible substrates, connected to basic capacitance measurement circuitry. This electrical approach eliminates heavy optical components like microscopes, light sources, and filters, reducing device weight and enabling portable, even handheld, configurations while maintaining reliable biological detection function.
Solution Approach 2:
The patent creates a universal sensing platform that can detect various biological agents (proteins, nucleic acids, small molecules) using the same capacitive liquid crystal sensor design. By functionalizing the electrode surface with different recognition elements, the same physical sensor structure can be adapted to detect different targets, eliminating the need for multiple specialized devices and reducing overall system complexity and portability requirements.
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 capacitive LC biosensor enables rapid, sensitive, and selective identification of biological agents, including nucleic acids, proteins, and small molecules, without the need for lab infrastructure, making it suitable for portable and disposable diagnostic devices.
Implementation Method 1
an organic LC phase positioned within each of the plurality of wells; and an aqueous phase comprising an analyte positioned above the organic LC phase within the plurality of wells
Implementation Method 2
capacitive liquid crystal (LC) biosensor for sensing a target biological agent
Data Source
AI summary
A capacitive liquid crystal (LC) biosensor for sensing a target biological agent includes a support board; a flow channel on the support board, the flow channel having an inlet port at a first end and an exit port at a second end; at least two electrodes, the at least two electrodes including a first electrode on a flow channel first surface and a second electrode on a flow channel second surface opposite the flow channel first surface; an electricity source connected to the first electrode and the second electrode; and an LC sensor array positioned within the flow channel. An LC sensor array includes a sensor support surface; wells positioned on the sensor support surface; an organic LC phase within each of the plurality of wells; and an aqueous phase having an analyte positioned above the organic LC phase within the wells.