Polymer Encapsulated Solids via Microfluidic Diffusion

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Solution Overview

Problem

Current systems for producing microcapsules struggle to effectively encapsulate solid materials that require special handling due to reactivity issues, preventing their transport to application sites without causing unwanted interactions.

Innovation Solution

A system for producing polymer-coated capsules that encapsulates precursor materials, which can be solids, liquids, or gases, by forming microcapsules using an inner fluid, a middle fluid encapsulation material, and an outer fluid, allowing controlled transformation into solids through environmental changes such as gas or fluid transport within the polymer shell.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If solid materials are transported without encapsulation, then handling and application are straightforward, but reactivity issues prevent transport to application sites

Engineering Contradiction:

Improvetransport stabilityVSAvoidreactivity

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A polymer shell acts as an intermediary barrier between the reactive solid material and the external environment. The shell encapsulates the solid, preventing unwanted interactions during transport while allowing controlled release at the application site through triggering events such as shell bursting or permeability increase.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent employs a polymer shell that forms a flexible yet protective enclosure around the solid material. This shell structure provides mechanical protection and chemical isolation, enabling safe transport of reactive solids while maintaining the ability to release the material when needed.

Inventive Principle:

Principle #30Flexible shells and thin films

2Manufacturing precision

If microcapsules are produced using conventional systems, then production is simple, but precise control over size distribution and surface area is difficult

Engineering Contradiction:

Improvesize distribution controlVSAvoidsystem complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent replaces conventional mechanical mixing and emulsification systems with a microfluidic device that uses controlled fluid flow through specific geometries to generate monodisperse droplets. This substitution enables precise control over capsule size and surface area through fluid dynamic parameters rather than mechanical forces.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The invention transitions from bulk-phase processing to micro-scale fluid flow control by using microfluidic channels. This dimensional change from macro to micro scale allows for precise control of droplet formation, leading to uniform capsule sizes and improved manufacturing precision.

Inventive Principle:

Principle #17Another dimension (Dimensionality change)

3Reliability

If reactive solids are encapsulated in polymer shells, then transport safety is improved, but controlled release requires specific triggering mechanisms

Engineering Contradiction:

Improvetransport safetyVSAvoidrelease control

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent utilizes phase transitions of the solid material (such as melting, sublimation, or decomposition) as the triggering mechanism for release. The polymer shell is designed to contain the material during transport, and release occurs when the solid undergoes a phase change that increases its volume or pressure, eventually bursting the shell or increasing permeability.

Inventive Principle:

Principle #36Phase transitions

Solution Approach 2:

The polymer shell is designed with predetermined weak points or structural features that will fail in a controlled manner when exposed to specific conditions (temperature, pressure, chemical environment). This preliminary design of the failure mode ensures safe and controlled release without requiring complex active triggering mechanisms.

Inventive Principle:

Principle #9Preliminary anti-action

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

Enables the controlled encapsulation and transport of reactive solids, allowing for precise control over size distribution and surface area, and enables release via triggering events, such as shell bursting, facilitating their use in applications like high explosives for geothermal energy.

Implementation Method 1

gas or fluid transport into or out of the polymer shell causes transformation into solids

Methodology Applied

Scientific EffectDiffusion: Diffusion

Data Source

PatentUS9821287B2Systems for production of polymer encapsuated solids

Publication Date: 2017.11.21 LAWRENCE LIVERMORE NAT SECURITY LLC

AI summary

Encapsulated solids are made by first encapsulating precursor materials in a polymer shell. The precursors are some combination of solids, liquids, gases, and/or gels. The precursors are then transformed into solids by emplacement of the capsule in an environment where gas or fluid transport into or out of the polymer shell causes transformation into solids.