Electrospray Langmuir-Blodgett Film Assembly

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Solution Overview

Problem

The Langmuir-Blodgett (LB) assembly technique faces challenges with colloidal stability and material loss due to the need for water-immiscible spreading solvents, which are toxic and difficult to handle in scaled-up operations.

Innovation Solution

The use of electrospray to aerosolize water-miscible solvents, such as short-chain alcohols, reduces the droplet size and volume, minimizing intermixing with water and allowing for high-yield spreading of colloidal materials on a water surface without visible material loss.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If water-immiscible spreading solvents are used for LB assembly, then colloidal stability is improved, but toxicity and handling difficulty increase

Engineering Contradiction:

Improvecolloidal stabilityVSAvoidtoxicity

Core Design Contradiction:

Stability of the object's compositionVSObject-affected harmful factors

Solution Approach 1:

The patent changes the key parameter of solvent miscibility from water-immiscible to water-miscible. By using water-miscible solvents like ethanol or isopropanol instead of traditional water-immiscible solvents, the patent eliminates toxicity while maintaining colloidal stability through optimized solvent composition and electrospray parameters

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent introduces electrospray as an intermediary mechanism to enable the use of water-miscible solvents. The electrospray system acts as a mediator that delivers colloidal particles through water-miscible solvents to the air-water interface, bridging the gap between solvent miscibility requirements and colloidal stability

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If water-miscible solvents are used for spreading, then toxicity is reduced, but material loss to water subphase increases

Engineering Contradiction:

ImprovetoxicityVSAvoidmaterial loss

Core Design Contradiction:

Object-affected harmful factorsVSLoss of substance

Solution Approach 1:

The patent replaces conventional mechanical spreading methods with electrospray technology. The electrospray system uses electrical fields to generate and deposit aerosolized particles directly onto the air-water interface, substituting mechanical solvent spreading with an electrical field-driven particle deposition process that prevents solvent-subphase mixing

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent segments the delivery process into distinct stages: aerosol generation in the gas phase, transport through air, and deposition at the air-water interface. This segmentation allows water-miscible solvents to evaporate or be excluded from the subphase before material deposition, preventing material loss while maintaining low toxicity

Inventive Principle:

Principle #1Segmentation

3Ease of operation

If conventional spreading methods are used, then ease of operation is maintained, but scalability and reproducibility are limited

Engineering Contradiction:

Improveease of operationVSAvoidscalability

Core Design Contradiction:

Ease of operationVSProductivity

Solution Approach 1:

The patent introduces dynamic control through electrospray parameters (voltage, flow rate, nozzle-to-surface distance) that can be adjusted to optimize deposition. This dynamic control system enables precise regulation of the assembly process, improving both reproducibility and scalability while maintaining operational simplicity through automated parameter control

Inventive Principle:

Principle #15Dynamics

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

This approach enables efficient, scalable, and environmentally friendly LB assembly by maintaining colloidal stability and avoiding material loss, thus broadening the scope of materials that can be processed and improving the reproducibility and safety of the technique.

Implementation Method 1

The use of electrospray to aerosolize water-miscible solvents, such as short-chain alcohols, reduces the droplet size and volume

Methodology Applied

Scientific EffectAerosol: Aerosol

Implementation Method 2

electrospray to aerosolize water-miscible solvents

Methodology Applied

Scientific EffectElectrospray: Electrohydrodynamics

Implementation Method 3

Langmuir-Blodgett (LB) assembly is a century-old material processing technique that was initially developed to create molecular monolayers

Methodology Applied

Scientific EffectLangmuir-Blodgett assembly: Self-Assembly

Implementation Method 4

A water-supported molecular monolayer is formed after the spreading solvent evaporates

Methodology Applied

Scientific EffectEvaporation: Evaporation

Data Source

PatentUS12202000B2Method and system for Langmuir-Blodgett assembly

Publication Date: 2025.01.21 NORTHWESTERN UNIV

AI summary

This invention relates to method and system for forming a film. The method including providing a trough containing water defining an air-water interface between air and the water; providing a solution containing a material of interest; and electrospraying the solution onto the air-water interface of water to form a film of the material of interest at the air-water interface. The system includes a trough containing water defining an air-water interface between air and the water; and means for spreading a solution containing a material of interest onto the air-water interface of water by electrospray, to form a film of the material of interest at the air-water interface. The spreading means comprises an electrospraying device.