Nanotextured Surfaces via Microwave-Assisted Polymer Template

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Solution Overview

Problem

Current methods for creating nanotextured surfaces are costly and time-consuming, particularly when using monodispersed polymer beads, and struggle to achieve regular monolayer coverage for features smaller than 50 nm, while existing hydrothermal treatments lack the efficiency of microwave-assisted processes.

Innovation Solution

A method involving microwave-assisted hydro- or solvo-thermal treatments to transform polymer films on substrates into uniform, regularly shaped nanometer-sized templates, allowing for rapid creation of nanotextured surfaces using polymers like PMMA, SBS, and SU-8, with the option to deposit materials and remove the template to form nanostructures such as nano-bottles, nano-bowls, and nano-rings.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If traditional photolithography or soft-lithography methods are used to create nanotextured surfaces, then regular patterns can be achieved, but the process is time-consuming and costly

Engineering Contradiction:

Improvepattern regularityVSAvoidfabrication time

Core Design Contradiction:

Manufacturing precisionVSLoss of time

Solution Approach 1:

The patent replaces traditional mechanical lithography processes with a self-assembly approach using block copolymers that spontaneously form nanoscale patterns through thermodynamic driving forces. This substitution of mechanical patterning with spontaneous molecular organization dramatically reduces fabrication time while maintaining pattern regularity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The block copolymer system performs self-organization into periodic nanodomains without external intervention during the pattern formation step. The polymers autonomously assemble into regular structures through selective phase separation, eliminating the need for time-consuming lithographic processing while achieving precise nanoscale patter

Inventive Principle:

Principle #25Self-service

2Manufacturing precision

If monodispersed polymer beads are used as templates, then nanotextured surfaces can be formed, but the cost is high and regular monolayer coverage is difficult to achieve for features smaller than 50 nm

Engineering Contradiction:

Improvenanotexture uniformityVSAvoidtemplate preparation difficulty

Core Design Contradiction:

Manufacturing precisionVSEase of manufacture

Solution Approach 1:

The patent uses spin-coated block copolymer films as temporary sacrificial templates that are easily deposited and subsequently removed. These disposable polymer templates are much cheaper than monodispersed bead templates and can be prepared rapidly by spin-coating, eliminating the costly and difficult bead assembly process while achieving uniform nanotexture coverage

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

Solution Approach 2:

The patent changes the template formation parameters from manual bead deposition to controlled spin-coating of polymer solutions. By adjusting spin speed, solvent composition, and polymer concentration, uniform nanoscale patterns are achieved across the entire substrate area, overcoming the limitation of achieving regular coverage with sub-50nm features using bead templates

Inventive Principle:

Principle #35Parameter changes

3Manufacturing precision

If conventional hydrothermal treatments are used, then polymer films can be transformed into nanotextured surfaces, but the process lacks efficiency

Engineering Contradiction:

Improvenanotexture formationVSAvoidprocess efficiency

Core Design Contradiction:

Manufacturing precisionVSProductivity

Solution Approach 1:

The patent employs microwave irradiation which delivers periodic electromagnetic energy to the polymer-solvent system, inducing rapid and uniform heating cycles. This periodic energy input accelerates the phase separation and nanotexture formation kinetics, transforming the slow conventional hydrothermal process into a rapid, efficient operation while maintaining precise nanotexture control

Inventive Principle:

Principle #19Periodic 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

This approach enables the rapid and cost-effective production of nanotextured surfaces suitable for various applications, including electronics, biotechnology, and cosmetics, with precise control over nanostructure size and shape, and the ability to create hollow nanostructures for enhanced functionality.

Implementation Method 1

transforming a polymer film on a substrate into uniform islands of a regularly shaped, nanometer sized template by microwave irradiation

Methodology Applied

Scientific EffectMicrowave irradiation: Microwave Radiation

Implementation Method 2

The microwave irradiation in the method is a microwave-assisted hydro- or solvo-thermal treatment

Methodology Applied

Scientific EffectMicrowave-assisted hydro- or solvo-thermal treatment: Heating

Data Source

PatentUS7923075B2Methods for preparing nanotextured surfaces and applications thereof

Publication Date: 2011.04.12 THE HONG KONG UNIV OF SCI & TECH

AI summary

A rapid and inexpensive technique for generating nanotextured surfaces is disclosed. The technique involves the (1) creation of regular, nanometer-sized template by microwave assisted hydro- or solvo-thermal treatment of polymer films coated on surfaces followed by (2) coating of a layer of metal, metal oxides, polymers and inorganic materials. The nanometer-sized polymer template could be removed to create regularly shaped, hollow nanostructures (e.g., nano-bottles, nano-bowls, nano-holes etc.).