Elastic Bubble Complex for Micro-Manipulation Propulsion

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Solution Overview

Problem

Conventional size-varying bubbles, such as air bubbles and perfluorocarbon bubbles, face challenges in providing a large propulsive force due to small change rates to external stimuli and have low persistence and repeatability, limiting their application in micro-manipulation technologies.

Innovation Solution

A size-varying bubble complex is developed, featuring a core made of perfluorocarbon encapsulated within a shell that expands and contracts together, allowing for repeated size variation by external stimuli, with a coating layer of alginate positioned between the core and shell to maintain core centrality and prevent adhesion, and using elastic materials like PDMS and centrifugal force for preparation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Force

If perfluorocarbon bubbles are used for size variation, then large propulsive force can be achieved, but persistence and repeatability are low

Engineering Contradiction:

Improvepropulsive forceVSAvoidpersistence and repeatability

Core Design Contradiction:

ForceVSReliability

Solution Approach 1:

The bubble system is segmented into three distinct layers: an inner perfluorocarbon core (providing propulsive force through phase change), an intermediate alginate coating layer (providing structural support and repeatability), and an outer elastic shell layer (maintaining stability and shape). This segmentation allows each layer to fulfill its specific function while working together to achieve both large propulsive force and high persistence.

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The invention uses a composite structure combining perfluorocarbon (for phase change and propulsion), alginate (for structural integrity), and elastic materials like PDMS (for stability and shape maintenance). This composite approach enables the bubble to achieve large size variation and propulsive force while maintaining high persistence and repeatability through the supportive outer layers.

Inventive Principle:

Principle #40Composite materials

2Device complexity

If perfluorocarbon is used as consumable in actuator, then phase change capability is achieved, but it cannot be used repeatedly

Engineering Contradiction:

Improvephase change capabilityVSAvoidrepeated use duration

Core Design Contradiction:

Device complexityVSDuration of action of stationary object

Solution Approach 1:

The perfluorocarbon core is surrounded by protective alginate and elastic shell layers that are prepared in advance. These outer layers cushion and contain the perfluorocarbon during repeated phase change cycles, preventing leakage and degradation. This allows the perfluorocarbon to undergo multiple phase changes (repeated use) while the outer layers maintain structural integrity and containment.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

3Ease of operation

If air bubble is used for micro-manipulation, then ease of operation is achieved, but propulsive force is insufficient

Engineering Contradiction:

Improvemicro-manipulation controlVSAvoidpropulsive force

Core Design Contradiction:

Ease of operationVSForce

Solution Approach 1:

The invention changes the material parameter of the bubble core from air to perfluorocarbon, which has superior phase change properties and higher propulsive force capability. The perfluorocarbon undergoes dramatic volume expansion during phase change, generating large propulsive force while the outer elastic shell maintains ease of operation and control for micro-manipulation applications.

Inventive Principle:

Principle #35Parameter changes

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 bubble complex achieves stable and repeated size variation, maintaining core centrality and preventing adhesion, enabling various shapes and sizes, and enhancing propulsive force through controlled phase changes with external stimuli.

Implementation Method 1

the bubble complex is capable of being repeatedly varied in size by changing phases of the perfluorocarbon by external stimuli

Methodology Applied

Scientific EffectPhase change: Phase Change

Implementation Method 2

a shell that encapsulates a core made of perfluorocarbon and protects the core by expanding and contracting together when the core expands and contracts

Methodology Applied

Scientific EffectElasticity: Elasticity

Implementation Method 3

by applying centrifugal force to the supporting liquid solution and then curing the supporting liquid solution, after injecting the perfluorocarbon

Methodology Applied

Scientific EffectCentrifugal force: Centrifugal Force

Data Source

PatentUS20220378953A1Elastic bubble complex and method of preparing the same

Publication Date: 2022.12.01 SOGANG UNIV RES FOUND

AI summary

Proposed is to provide a size-varying bubble complex and a method of preparing the same. More specifically, the size-varying bubble complex and the method of preparing the same are proposed, wherein the bubble complex is capable of being repeatedly varied in size by changing phases of perfluorocarbon by external stimuli, by including a shell that encapsulates a core made of the perfluorocarbon and protects the core by expanding and contracting together when the core expands and contracts.