Titanium Nanostructure with Tetragonal-Pyramidal Nanocrystals
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Solution Overview
Problem
Existing titanium-based implant nanostructures are fragile and prone to breaking during implantation, leading to inflammation and bone loss due to the detachment of titanium oxide nanoparticles, and they fail to effectively prevent bacterial colonization.
Innovation Solution
A hydrothermal oxidation method is used to create a bactericidal and hydrophilic nanostructure on titanium surfaces with tetragonal-pyramidal nanocrystals, which are compact and stable, reducing bacterial colonization by damaging bacterial cell membranes and promoting cell attachment and healing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If hydrothermal oxidation is performed on mechanically roughened titanium surface, then antibacterial nanostructure is formed, but the nanostructure becomes fragile and brittle causing nanoparticles to break out during implantation
Solution Approach 1:
The patent changes the chemical composition parameters of the hydrothermal solution by adding fluoride ions (e.g., NH4F, HF) to the aqueous solution. This parameter modification transforms the oxidation process to form more stable titanium oxide nanostructures with controlled morphology (tetragonal-pyramidal shapes) that resist fragmentation during implantation while maintaining antibacterial properties.
Solution Approach 2:
The patent creates a composite surface structure consisting of titanium substrate with hydrothermally grown titanium oxide nanostructures. The composite nature of the surface layer (titanium metal base + titanium oxide nanostructure) provides both mechanical stability from the metal substrate and antibacterial functionality from the oxide nanostructure, preventing nanoparticle detachment while maintaining effectiveness.
2Object-affected harmful factors
If nanocrystal size and density are increased to improve antibacterial effect, then bacterial membrane damage increases, but surface area for cell attachment decreases
Solution Approach 1:
The patent creates local quality variations in the nanostructure by controlling nanocrystal distribution density and size across different surface regions. The hydrothermal process with fluoride ions produces tetragonal-pyramidal nanocrystals with specific aspect ratios and spacing, creating localized sharp features for bacterial damage while maintaining overall surface area for eukaryotic cell attachment through controlled area density gradients.
Solution Approach 2:
The patent transitions from considering only two-dimensional nanocrystal density to incorporating the third dimension of nanocrystal height and aspect ratio. The tetragonal-pyramidal shape with controlled height-to-base ratios provides vertical sharpness for bacterial membrane penetration while the base area maintains sufficient attachment surface, effectively utilizing dimensional parameters to resolve the area-density trade-off.
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 nanostructure effectively prevents bacterial colonization, particularly of gram-negative bacteria, while maintaining stability during implantation, enhancing osseointegration and reducing inflammation.
Implementation Method 1
a method for generating a nanostructure on at least one surface or surface region of a titanium body by hydrothermal oxidation
Implementation Method 2
the initial surface for nanostructure generation is exposed to a 160 to 374.12° C. hot vapor pressure atmosphere
Data Source
AI summary
A nanostructure is made of a plurality of nanocrystals on at least one surface or surface region of a titanium body. A method for generating such nanostructure is by means of hydrothermal oxidation. Thereby, the nanocrystals have a basic tetragonal-pyramidal shape, at least in some regions. The area density of the nanocrystals is between 40 and 400 per μm2, wherein the area density decreases with increasing crystal height. The average spacing of 50 to 160 nm of adjacent nanocrystals is obtained at a nanocrystal height of 23 to 100 nm. This provides a titanium-based, bactericidal and hydrophilic nanostructure for implant surfaces and, at the same time, a corresponding manufacturing method with which the size and distribution of the nanocrystals forming a nanostructure that facilitates healing can be determined.