Titanate Titania Nanostructure Assembly Synthesis
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Solution Overview
Problem
Current methods for synthesizing titania nanostructures lack control over size and shape, and the preparation of higher-order assemblies of titanate and titania nanostructures often requires templates, resulting in amorphous or semicrystalline products.
Innovation Solution
A method for synthesizing micrometer-scale spherical aggregates of titanate and titania nanostructures using a one-pot assembly process without templates, involving the mixing of alkali metal hydroxide and peroxide solutions with a titanium source, followed by heating and annealing to produce crystalline, defect-free anatase titania nanostructures with controlled size and shape.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Shape
If template-based methods are used to prepare higher-order assemblies of titanate and titania nanostructures, then assembly structure is achieved, but the products become amorphous or semicrystalline and require additional purification steps
Solution Approach 1:
The patent applies preliminary action by pre-forming titanate nanosheets with specific crystalline structures before final assembly. The nanosheets are synthesized with controlled crystallographic orientations that direct subsequent self-assembly into higher-order structures without requiring templates, thereby maintaining crystallinity throughout the process.
Solution Approach 2:
The patent uses titanate nanosheets as intermediaries between atomic precursors and final titania assemblies. These nanosheets serve as structural templates that self-assemble into higher-order configurations, eliminating the need for external templates while preserving crystalline structure through controlled transformation from titanate to titania phases.
2Productivity
If conventional bottom-up methodologies are used starting from atomic or molecular precursors, then nanomaterials can be synthesized, but simultaneous control over nanoparticle structure, surface chemistry, monodispersity, crystal structure, and assembly is difficult to achieve
Solution Approach 1:
The patent segments the synthesis process into distinct stages: first forming titanate nanosheets with controlled crystal structures, then assembling them into higher-order structures, and finally transforming to titania phases. This segmentation allows independent optimization of each parameter (structure, surface chemistry, monodispersity) at different stages rather than attempting simultaneous control from atomic precursors.
Solution Approach 2:
The patent employs parameter changes by controlling pH, temperature, and composition during nanosheet formation to achieve precise control over crystal structure and surface properties. By adjusting these parameters during intermediate stages rather than from atomic precursors, the method achieves superior control over multiple nanoparticle characteristics simultaneously.
3Productivity
If top-down strategies such as milling, imprinting, or etching are used, then nanomaterials can be generated, but control over available geometries, shapes, and sizes is limited
Solution Approach 1:
The patent inverts the conventional top-down approach by using bottom-up self-assembly of pre-formed nanosheets. Instead of starting with bulk materials and breaking them down into desired shapes, the method builds structures from nanoscale sheets that naturally form with specific geometries through controlled chemical reactions, thereby achieving superior shape and size control.
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 allows for the predictive formation of titanate and titania products with improved photocatalytic ability, achieving high purity and crystallinity without the need for mineralizers or anionic additives, and can be scaled up for gram quantities while maintaining morphological structure.
Implementation Method 1
mixing of alkali metal hydroxide and peroxide solutions with a titanium source, followed by heating and annealing
Implementation Method 2
mixing of alkali metal hydroxide and peroxide solutions with a titanium source, followed by heating and annealing
Implementation Method 3
heating and annealing to produce crystalline, defect-free anatase titania nanostructures
Implementation Method 4
heating and annealing to produce crystalline, defect-free anatase titania nanostructures
Data Source
AI summary
The invention relates to nanomaterials and assemblies including, a micrometer-scale spherical aggregate comprising: a plurality of one-dimensional nanostructures comprising titanium and oxygen, wherein the one-dimensional nanostructures radiate from a hollow central core thereby forming a spherical aggregate.