Metahalloysite Powder Production via Carbon Coating

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Solution Overview

Problem

There is a need for new materials with expanded applications, and existing methods for producing halloysite-based materials do not effectively create a novel, adsorptively capable powder.

Innovation Solution

The production of metahalloysite powder involves spray-drying a slurry containing halloysite nanotubes and organic carbon, followed by firing in an inert atmosphere at a predetermined temperature, resulting in a powder with metahalloysite nanotubes covered by elemental carbon.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If halloysite nanotubes are used directly for applications, then the tube shape is preserved, but the adsorptive capacity for organic substances is insufficient

Engineering Contradiction:

Improveadsorptive capacityVSAvoidmaterial modification complexity

Core Design Contradiction:

Quantity of substanceVSEase of manufacture

Solution Approach 1:

The patent creates a composite material by coating halloysite nanotubes with carbon, forming a core-shell structure where the halloysite core provides structural integrity and the carbon shell provides adsorptive capacity for organic substances. This composite approach resolves the contradiction by combining two materials with complementary properties.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The carbon coating is applied specifically to the outer surface of the halloysite nanotubes, creating a localized modification that enhances adsorptive capacity without altering the internal structure or requiring complete material replacement. This local quality change allows functional enhancement while maintaining the original material's structural advantages.

Inventive Principle:

Principle #3Local quality

2Stability of the object's composition

If halloysite is fired at high temperature to convert to metahalloysite, then the crystal structure transforms, but the organic carbon coating is lost

Engineering Contradiction:

Improvecrystal structure stabilityVSAvoidelemental carbon content

Core Design Contradiction:

Stability of the object's compositionVSQuantity of substance

Solution Approach 1:

The patent employs an inert atmosphere (such as nitrogen or argon) during the firing process to prevent oxidation and combustion of the carbon coating. This inert environment allows the halloysite to transform into metahalloysite at elevated temperatures while preserving the carbon layer, thus resolving the contradiction between crystal structure transformation and carbon retention.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

Solution Approach 2:

The carbon coating is applied to the halloysite nanotubes before the firing process. This preliminary action ensures that the carbon layer is already in place to provide adsorptive functionality, and the subsequent firing in inert atmosphere only transforms the crystal structure without removing the carbon.

Inventive Principle:

Principle #10Preliminary action

3Quantity of substance

If the surface of halloysite nanotubes is modified to improve adsorption, then adsorptive capacity increases, but hydrophobicity decreases

Engineering Contradiction:

Improveadsorptive capacityVSAvoidhydrophobicity

Core Design Contradiction:

Quantity of substanceVSObject-affected harmful factors

Solution Approach 1:

The patent changes the surface chemical composition by coating with carbon, which fundamentally alters the surface properties. The carbon coating provides both high adsorptive capacity for organic substances and inherent hydrophobicity, simultaneously improving adsorption while maintaining water repellency through the carbon's non-polar surface characteristics.

Inventive Principle:

Principle #35Parameter changes

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 method produces a metahalloysite powder with enhanced adsorptive capacity for organic substances, improved hydrophobicity, and specific structural characteristics that facilitate easier handling and application.

Implementation Method 1

spray-drying a slurry containing a halloysite nanotube and an organic carbon

Methodology Applied

Scientific EffectEvaporation: Evaporation

Implementation Method 2

firing the resultant in an inert atmosphere at a predetermined temperature would become metahalloysite powder including a granule that is an aggregate of metahalloysite including a metahalloysite nanotube covered by elemental carbon

Methodology Applied

Scientific EffectPyrolysis: Pyrolysis

Implementation Method 3

metahalloysite powder with enhanced adsorptive capacity for organic substances

Methodology Applied

Scientific EffectAdsorption: Adsorption

Data Source

PatentUS12330952B2Metahalloysite powder and production method therefor

Publication Date: 2025.06.17 JFE MINERAL CO LTD

AI summary

The present invention provides a novel material using a meta-halloysite that does not exist in prior art, and a production method therefor. The meta-halloysite powder of the present invention is characterized in that: the meta-halloysite is covered by elemental carbon; the meta-halloysite contains elemental carbon; the meta-halloysite powder is a powder containing granules formed by the aggregation of meta-halloysite comprising meta-halloysite nanotubes covered by elemental carbon; or the meta-halloysite powder is powder containing granules formed by the aggregation of meta-halloysite comprising meta-halloysite nanotubes, which are tubular meta-halloysite, wherein the meta-halloysite contains elemental carbon.