Biomimetic Insect Actuator with VO2-CNT Composite Wings

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Solution Overview

Problem

Conventional electro-thermal actuators based on composite materials with carbon nanotubes suffer from limited deformation and slow response rates due to their material properties.

Innovation Solution

A carbon nanotube-based actuator is developed using a vanadium dioxide layer that shrinks upon phase transformation, combined with a carbon nanotube layer for enhanced light-heat conversion efficiency, allowing for faster and more significant bending movements.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Speed

If conventional electro-thermal composite materials containing carbon nanotubes are used, then the actuator can generate heat and expand, but the deformation is not large enough and the response rate is slow

Engineering Contradiction:

Improveresponse rateVSAvoiddeformation capability

Core Design Contradiction:

SpeedVSProductivity

Solution Approach 1:

The patent uses a composite structure consisting of a vanadium dioxide layer and a carbon nanotube layer. The vanadium dioxide provides phase transformation-driven deformation with high speed, while the carbon nanotube layer enhances light-heat conversion efficiency. This composite approach combines the advantages of both materials to achieve large deformation and fast response simultaneously.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The vanadium dioxide layer undergoes phase transformation from insulating to metallic phase when heated, causing spontaneous strain and rapid bending. This phase transition mechanism enables the actuator to achieve large deformation quickly, resolving the contradiction between response rate and deformation capability.

Inventive Principle:

Principle #36Phase transitions

2Ease of operation

If conventional electro-thermal composite materials are used, then the structure can be flexible and conductive, but the deformation and response rate are insufficient

Engineering Contradiction:

ImproveflexibilityVSAvoidresponse rate

Core Design Contradiction:

Ease of operationVSSpeed

Solution Approach 1:

The combination of vanadium dioxide and carbon nanotubes creates a composite material that maintains flexibility while dramatically improving response rate. The carbon nanotubes provide excellent electrical conductivity and flexibility, while the vanadium dioxide adds fast phase transformation capability, achieving both ease of operation and high speed.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent changes the material parameters by introducing vanadium dioxide with its unique phase transformation properties. This parameter change enables the actuator to respond much faster to thermal stimulation while maintaining the flexible and conductive characteristics needed for ease of operation.

Inventive Principle:

Principle #35Parameter changes

3Shape

If conventional electro-thermal actuators with polymer membranes are used, then the actuator can bend when heated, but the deformation is limited and response is slow

Engineering Contradiction:

Improvebending capabilityVSAvoidresponse time

Core Design Contradiction:

ShapeVSLoss of time

Solution Approach 1:

The vanadium dioxide layer undergoes rapid phase transition when heated, producing spontaneous strain that drives bending. This phase transition mechanism is much faster than the thermal expansion of conventional polymers, reducing response time while significantly enhancing bending capability.

Inventive Principle:

Principle #36Phase transitions

Solution Approach 2:

The composite structure of vanadium dioxide and carbon nanotubes overcomes the limitations of pure polymer membranes. The vanadium dioxide provides fast phase transformation for rapid bending, while the carbon nanotube layer enhances light absorption and heat generation efficiency, achieving superior bending capability and reduced response time simultaneously.

Inventive Principle:

Principle #40Composite materials

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 actuator exhibits improved response rates and deformation capabilities, overcoming the limitations of conventional systems by leveraging the high efficiency and spontaneous strain of the vanadium dioxide phase transformation.

Implementation Method 1

the carbon nanotube layer (110) generates heat to heat the vanadium dioxide layer (111) or absorbs heat and transfer the heat to the vanadium dioxide layer (111)

Methodology Applied

Scientific EffectLight-heat conversion: Absorption (EM radiation)

Implementation Method 2

A carbon nanotube-based actuator is developed using a vanadium dioxide layer that shrinks upon phase transformation

Methodology Applied

Scientific EffectPhase transformation: Phase Change

Implementation Method 3

When a current is applied, the electro-thermal composite materials containing carbon nanotubes can generate heat

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS10807713B2Biomimetic insect

Publication Date: 2020.10.20 HON HAI PRECISION INDUSTRY CO LTD

AI summary

The disclosure relates to a biomimetic insect. The biomimetic insect includes a trunk and at least two wings connected to the trunk. The wing includes a carbon nanotube layer and a vanadium dioxide layer (VO2) layer stacked with each other. Because the drastic, reversible phase transition of vanadium dioxide, the wing has giant deformation amplitude and fast response.