Electronically Reversible Adhesive Using Charged Nanoparticles
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Solution Overview
Problem
Conventional carbon-nanotube forest adhesives require external actuators for separation, adding complexity, weight, and power requirements due to their resistance to shear forces but not normal forces, making them inefficient for movable systems.
Innovation Solution
An adhesive system comprising carbon nanotubes, charged nanoparticles, and an electrical source, where the electrical source selectively charges the backing to create an electrical repulsion force, reducing the adhesive strength and allowing for electronic disengagement without external actuators.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional carbon-nanotube forest adhesives are used, then strong adhesive strength is achieved, but external actuators are required for separation, adding complexity, weight, and power requirements
Solution Approach 1:
The patent replaces the mechanical actuator system with an electrical field-based separation mechanism. By applying an electrical field to the backing, charged nanoparticles are attracted to it, creating a normal force that separates the adhesive from the contact surface without requiring external mechanical actuators, thereby reducing device complexity while maintaining strong adhesive strength
Solution Approach 2:
The patent changes the physical state of the adhesive system by introducing charged nanoparticles that can be electrically activated. By controlling the electrical charge parameter, the adhesive transitions between strongly bonded and easily separable states, eliminating the need for mechanical actuators and reducing overall system complexity
2Strength
If conventional carbon-nanotube forest adhesives are used, then strong adhesive strength is achieved, but the separation force required is at least as great as the adhesive strength, making it inefficient for movable systems
Solution Approach 1:
The patent applies preliminary anti-action by using an electrical field to create a normal force that actively pushes the adhesive away from the contact surface during separation. This pre-applied force opposes the adhesive bonding force, reducing the additional separation force needed compared to conventional adhesives where separation force must equal or exceed adhesive strength
Solution Approach 2:
The patent substitutes mechanical separation force with an electrical field-induced normal force. The electrical field attracts charged nanoparticles to the backing, creating a repulsive normal force that facilitates separation without requiring external mechanical actuators to apply forces equal to or greater than adhesive strength
3Strength
If conventional carbon-nanotube forest adhesives are used, then strong adhesive strength is achieved, but external actuators are required, adding weight and power requirements
Solution Approach 1:
The patent replaces heavy mechanical actuators with a lightweight electrical field generation system. The backing with embedded charged nanoparticles can be electrically activated to create separation forces, eliminating the need for heavy external actuators and significantly reducing the weight of movable systems
Solution Approach 2:
The adhesive system serves itself by using its own charged nanoparticles and electrical field to facilitate separation. The backing with charged nanoparticles acts as both the adhesive substrate and the separation mechanism, eliminating the need for external actuators and reducing overall system weight
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 system enables electronic control of adhesive strength, reducing the force needed for separation and eliminating the need for external actuators, thus simplifying the disengagement process and reducing complexity and power requirements.
Implementation Method 1
The electrical source is configured to selectively electrically charge the backing to cause an electrical repulsion force between the backing and the charged nanoparticles
Implementation Method 2
Dry adhesive may exploit an aggregate van der Waals force between the dry adhesive and the contact surface when the adhesive is in intimate contact with the contact surface
Data Source
AI summary
A method of decoupling an adhesive system from a contact surface of an object is disclosed. The adhesive system has a full adhesive strength in a de-energized state. The adhesive system comprises a backing, carbon nanotubes, each having a first end region, coupled to the backing, and a second end region, opposite the first end region, and charged nanoparticles, each coupled to the second end region of at least one of the carbon nanotubes. The method comprises steps of electrically charging the backing and disengaging the adhesive system from the contact surface. Electrically charging the backing creates an electrical repulsion force between the backing and the charged nanoparticles, so that the full adhesive strength of the adhesive system is decreased to a reduced adhesive strength. Disengaging the adhesive system from the contact surface comprises applying a disengagement force to the adhesive system sufficient to overcome the reduced adhesive strength.