Microwave-Synthesized High Entropy Oxides for Cortisol Sensing

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Solution Overview

Problem

Conventional methods for synthesizing high entropy oxides (HEOs) are costly, energy-intensive, and result in micron-scale agglomerated particles with low surface areas, limiting their efficient catalytic activity, especially for applications like biomolecular detection.

Innovation Solution

A microwave-assisted solvothermal method is used to synthesize nanostructured HEOs, which are dispersed on graphene oxide, enhancing their catalytic performance by maximizing surface area and active sites, and enabling their use in electrochemical and colorimetric sensors for cortisol detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Area of stationary object

If conventional synthesis methods (solid-state reactions, flame spray pyrolysis, co-precipitation) are used to synthesize HEOs, then the synthesis process can be completed, but the resulting particles are micron-scale agglomerates with low surface areas, limiting catalytic activity

Engineering Contradiction:

Improvesurface area of HEO particlesVSAvoidcatalytic activity efficiency

Core Design Contradiction:

Area of stationary objectVSProductivity

Solution Approach 1:

The patent employs microwave irradiation to fundamentally change the heating parameter from conventional conductive heating to direct dielectric heating. This parameter change enables rapid, uniform heating throughout the reaction mixture, producing nanostructured HEOs with high surface area instead of micron-scale agglomerates, thereby resolving the contradiction between particle size and catalytic efficiency

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces conventional thermal field methods (heating, stirring) with microwave field irradiation. The microwave field directly couples with the reaction mixture to induce rapid heating and nucleation, substituting mechanical mixing and gradual thermal diffusion with electromagnetic field-driven synthesis, which produces finer nanostructured particles with higher surface area and improved catalytic activity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

2Temperature

If conventional synthesis methods are used, then the synthesis can proceed, but extremely high temperatures are required, leading to high energy consumption

Engineering Contradiction:

Improvesynthesis temperatureVSAvoidenergy consumption

Core Design Contradiction:

TemperatureVSUse of energy by stationary object

Solution Approach 1:

The patent substitutes conventional thermal heating with microwave field irradiation. The microwave field directly energizes the reaction mixture through dielectric heating, eliminating the need for external high-temperature heating apparatus. This substitution achieves synthesis at lower effective temperatures with significantly reduced energy consumption, as microwaves transfer energy directly to the material rather than heating the surrounding environment

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Ease of manufacture

If conventional synthesis methods are used, then HEOs can be synthesized, but the process requires expensive and complicated equipment and prolonged processing time

Engineering Contradiction:

Improvesynthesis process simplicityVSAvoidprocessing time

Core Design Contradiction:

Ease of manufactureVSLoss of time

Solution Approach 1:

The patent replaces complex conventional synthesis equipment (high-temperature furnaces, specialized reactors, extended stirring apparatus) with a simple microwave irradiation setup. The microwave field enables rapid synthesis in a straightforward process, eliminating prolonged processing times and reducing equipment complexity while maintaining synthesis effectiveness

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent utilizes periodic microwave irradiation cycles to drive the synthesis reaction. The periodic nature of microwave heating enables rapid, controlled reaction progression, significantly reducing processing time compared to continuous conventional heating methods while simplifying the overall manufacturing process

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

The method produces HEOs with high surface area and abundant active sites, allowing for efficient detection and quantification of cortisol in bodily fluids, demonstrating improved stability and reproducibility in electrochemical sensors.

Implementation Method 1

exposing the reaction medium to microwave irradiation

Methodology Applied

Scientific EffectMicrowave heating: Dielectric Heating

Data Source

PatentUS20250289727A1High entropy oxides and methods of synthesis and use thereof

Publication Date: 2025.09.18 UNIV OF HAWAII

AI summary

The present invention provides compositions and nanomaterials comprising a metal based high entropy oxide comprising at least five metals and their oxides distributed in a crystal structure, with high configurational entropy, a high number of oxygen vacancies and active catalytic sites. The present invention also relates to methods of synthesis of said compositions and nanomaterials using microwave irradiation and methods of use of said compositions and nanomaterials in analyte sensing as nanozymes, electrochemical sensors, and colorimetric sensors.