Carbon Nanotube Artificial Muscle Valve Pressure Control
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Solution Overview
Problem
Existing carbon nanotube (CNT) artificial muscle devices face challenges in creating reliable and efficient fluid control mechanisms due to limitations in adhesion and connection methods for CNT tubes, particularly in micro-fluidic applications where traditional adhesives fail to effectively bond with polymeric or rubber-based materials.
Innovation Solution
A hollow CNT tube valve system is developed, where CNT sheets are wrapped into a tube form with a guest material and adhesive applied to the inner surface of a rigid tube, allowing for secure fastening and fluid pressure-controlled kinking mechanisms, enabling precise fluid flow regulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional adhesives are used to bond CNT tubes, then the bonding process is simple, but the adhesion reliability fails in micro-fluidic applications
Solution Approach 1:
The patent introduces a specialized adhesive composition as an intermediary between the CNT tube and the bonding surface. This adhesive contains functional groups that specifically interact with the CNT structure, creating reliable adhesion where traditional adhesives fail. The adhesive acts as a mediator that bridges the compatibility gap between polymeric/rubber-based CNT tubes and bonding substrates in micro-fluidic applications.
Solution Approach 2:
The patent modifies the chemical and physical parameters of the adhesive system by using a two-part epoxy composition with specific molecular weight ranges and functional group compositions. This parameter optimization enables the adhesive to penetrate and bond effectively to the CNT tube structure, transforming the bonding process from unreliable to dependable while maintaining manufacturing feasibility.
2Reliability
If CNT sheets are wrapped into hollow tube form, then the artificial muscle function is achieved, but the connection stability to rigid tubes becomes problematic
Solution Approach 1:
The patent implements a nested connection structure where the hollow CNT tube is inserted into a rigid tube, and the adhesive is applied to the inner surface of the rigid tube. This nested arrangement creates a stable connection while maintaining the flexibility and functionality of the CNT artificial muscle. The multi-layered structure (CNT tube within rigid tube with adhesive interface) provides both stability and ease of assembly.
3Ease of operation
If fluid pressure is used to control valve opening, then the operation simplicity is improved, but the pressure threshold precision needs enhancement
Solution Approach 1:
The patent applies local quality by creating a specific geometric feature (kink or bend) at a predetermined location in the CNT tube that acts as the valve closure point. This localized structural feature ensures that the valve opens at a specific pressure threshold, providing precision control. The rest of the tube maintains its normal flexible properties, while the localized kink provides the precise opening pressure characteristic.
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 solution provides a reliable and efficient method for controlling fluid flow by utilizing the mechanical properties of CNTs to create a kinking mechanism within the hollow CNT tube, allowing for precise regulation of fluid flow and stable connections in micro-fluidic systems.
Implementation Method 1
the adhesive infiltrates an outside portion of the end of the hollow CNT tube
Implementation Method 2
When a pressure of a fluid in the hollow CNT tube exceeds a predetermined pressure, the at least one portion of the hollow CNT yarn collapses and forms a kink
Data Source
AI summary
A carbon nanotube (CNT) artificial muscle valve includes a hollow CNT tube including: a plurality of CNT sheets wrapped in the form of a hollow tube; and a guest material disposed between the CNT sheets and that permeates the CNT sheets. At least one portion of the hollow CNT tube collapses in response to a pressure of a fluid in the hollow CNT tube exceeding a predetermined pressure. The at least one portion of the hollow CNT tube collapses because the at least one portion of the hollow CNT tube generates a torque non-uniformity relative of a remaining portion of the hollow CNT tube.