Rotational Nanosheet Coating for Enhanced Barrier Properties

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Solution Overview

Problem

There is a need for improved techniques to prepare nanosheet coatings with enhanced uniformity and barrier properties, as existing methods do not effectively align nanosheets to achieve these properties.

Innovation Solution

A rotational coating system that includes a motor, a source for discharging a dispersion, and a radiation source is used to rotate a container lined with a substrate, applying centrifugal and centripetal forces to align nanosheets parallel to the substrate, resulting in a coating with higher periodicity in one direction than the other.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If traditional coating methods (dip coating, doctor blade coating, spin coating) are used to apply nanosheet coatings, then the coating process is simple and easy to operate, but the nanosheets are not effectively aligned to achieve enhanced uniformity and barrier properties

Engineering Contradiction:

Improvenanosheet alignment and uniformityVSAvoidcoating process complexity

Core Design Contradiction:

Manufacturing precisionVSEase of operation

Solution Approach 1:

The patent applies dynamic centrifugal force through rotational motion to align nanosheets during the coating process. The container rotates at controlled speeds to generate centrifugal force that orientates nanosheets parallel to the substrate surface, transforming a static coating process into a dynamic one that achieves superior alignment and uniformity

Inventive Principle:

Principle #15Dynamics

Solution Approach 2:

The patent changes the physical parameters of the coating process by introducing rotational speed as a controllable variable. By adjusting rotation speed, the centrifugal force is optimized to achieve nanosheet alignment without compromising coating uniformity, thereby improving manufacturing precision while maintaining operational simplicity

Inventive Principle:

Principle #35Parameter changes

2Reliability

If shear stress is applied to align nanosheets within a coating, then barrier properties are improved, but the coating uniformity and nanosheet orientation control are reduced

Engineering Contradiction:

Improvebarrier propertiesVSAvoidnanosheet orientation control

Core Design Contradiction:

ReliabilityVSManufacturing precision

Solution Approach 1:

The patent replaces mechanical shear stress with centrifugal force generated by rotation. This substitution allows for better control over nanosheet orientation, as centrifugal force acts radially outward to align nanosheets parallel to the substrate, providing more predictable and controllable orientation compared to shear stress mechanisms

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 rotational coating method produces nanosheet coatings with enhanced surface coverage, barrier properties against oxygen and water, and high transmittance, surpassing traditional coating methods such as dip coating, doctor blade coating, and spin coating.

Implementation Method 1

The motor is operative to rotate the container... The container is rotated to cause spreading of the dispersion on the inner surface

Methodology Applied

Scientific EffectCentrifugal force: Centrifugal Force

Implementation Method 2

The radiation source is operative to irradiate the dispersion to promote the formation of a nanosheet coating on the inner surface

Methodology Applied

Scientific EffectRadiation: Radiation

Implementation Method 3

The solvent is removed during rotation to provide a nanosheet coating on the inner surface

Methodology Applied

Scientific EffectEvaporation: Evaporation

Data Source

PatentUS20250100009A1System and method for rotational coating of nanocomposites and nanosheet coatings produced therefrom

Publication Date: 2025.03.27 UNIV OF CONNECTICUT

AI summary

A coated article includes a container that is optionally lined with a substrate and is characterized by an inner surface. A nanosheet coating that includes a binder and nanosheets is disposed on the inner surface. The nanosheet coating displays a higher periodicity between the nanosheets in a direction parallel to the substrate than in a direction perpendicular to the substrate. A rotational coating system for disposing a nanosheet coating on a container includesa motor, a source for discharging a dispersion and a radiation source. The motor is operative to rotate the container. The container is optionally lined with a substrate and is characterized by an inner surface. The source discharges a dispersion on to the inner surface. The dispersion includes a solvent, a binder and nanosheets. The radiation source is operative to irradiate the dispersion to promote the formation of a nanosheet coating on the inner surface.