MXene Tablet Morphology via Spark Plasma Sintering
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing MXene compounds exhibit wide dispersion in size and shape, limiting their electrical conductivity and intercalation rates, and resulting in poor interconnectivity between crystals, making it difficult to obtain homogeneous thin sheets for various applications.
Innovation Solution
A process involving spark plasma sintering and two chemical attack steps using an aqueous acid solution to produce MXene compounds with a specific tablet morphology, achieving a more uniform size distribution and improved interconnectivity, resulting in a MAX phase precursor with porosity greater than 30% and a stoichiometric element ratio.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional synthesis methods are used to produce MAX phase precursors, then production is achieved, but the resulting MXene particles exhibit wide dispersion in size and shape, limiting electrical conductivity and intercalation rates
Solution Approach 1:
The patent applies preliminary action by carefully controlling the synthesis conditions of the MAX phase precursor before the actual MXene formation. The synthesis parameters (temperature, time, stoichiometry) are pre-optimized to ensure uniform particle morphology is established early in the process, which then propagates through the subsequent etching steps to produce MXene with consistent size and shape, directly improving both manufacturing precision and the resulting electrical conductivity
Solution Approach 2:
The patent employs parameter changes by systematically varying synthesis parameters such as sintering temperature, holding time, and precursor stoichiometry ratios. These parameter adjustments are made to transform the particle morphology from irregular and dispersed to uniform and controlled, thereby resolving the contradiction between manufacturing precision and the reliability of electrical properties
2Manufacturing precision
If conventional synthesis methods are used, then MXene particles are produced, but poor interconnectivity between crystals is achieved, limiting functionality in thin layer applications
Solution Approach 1:
The patent applies local quality by ensuring that the MAX phase precursor has uniform local composition and structure throughout the material. This local uniformity in the precursor translates to consistent local properties in the final MXene product, improving crystal-to-crystal interconnectivity and enabling easier fabrication of homogeneous thin sheets with reliable functional properties
3Shape
If delamination is performed to obtain single sheets, then 2D MXene is achieved, but additional size selection operations are required due to strong dispersion in particle size
Solution Approach 1:
The patent applies preliminary action by establishing uniform particle size distribution during the MAX phase synthesis stage, before delamination occurs. This pre-established uniformity carries through the delamination process, allowing single sheets to be obtained without requiring additional size selection operations, thereby reducing device complexity while maintaining the desired 2D sheet structure
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 approach enables the fabrication of MXene compounds with a homogeneous particle size distribution and enhanced interconnectivity, facilitating faster intercalation of species and improved electrical conductivity, allowing for the production of more uniform and functional thin sheets.
Implementation Method 1
The mixture is then subjected to a spark plasma sintering process in a spark plasma sintering device
Implementation Method 2
The aluminium is thereby removed from the space between the Mn+1Xn repeat units leaving the terminal groups Tx, with T most often being —F, —OH or ═O
Data Source
AI summary
MXene compound having a novel crystalline morphology, and process for fabricating a compound of MAX phase type for synthesis of said MXene compound. The invention firstly relates to a MXene compound advantageously having a crystalline morphology that is mostly in tablet form which may be obtained from a MAX phase precursor obtained by spark plasma sintering process whereby the powders of the mixture are insulated, and to a process for fabricating the MXene compound. The invention also relates to compound of MAX phase type obtained by spark plasma sintering process whereby the powders of the mixture are insulated. The invention also relates to a synthesis process of an MXene compound from said precursor, and to the MXene compound thus obtained advantageously having a crystalline morphology that is mostly in tablet form.