Boron-Nitrogen Doped Titanium Dioxide Particles for Non-Toxic Color Range
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Solution Overview
Problem
Existing methods for doping titanium dioxide with transition metal ions to achieve colors other than red and yellow result in biotoxicity, limiting its applications in medical and cosmetic uses, and there is a need for a process that can develop various colors without compromising non-toxicity.
Innovation Solution
Co-doping titanium dioxide with nitrogen and boron ions using a hydrothermal reaction and nitriding treatment, followed by a temporary calcination process, to achieve a brookite or rutile crystal structure, allowing for the development of a wide range of colors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If transition metal ions are doped into titanium dioxide to develop colors, then color development is achieved, but biotoxicity increases and biocompatibility deteriorates
Solution Approach 1:
The patent removes transition metal ions from the doping system and replaces them with non-metallic dopants (nitrogen, boron, sulfur, phosphorus, carbon) to eliminate biotoxicity while maintaining color development capability
Solution Approach 2:
The patent changes the chemical composition parameters by substituting metallic dopants with non-metallic elements, fundamentally altering the doping approach to achieve both color development and biocompatibility
2Ease of manufacture
If nitrogen and boron ions are co-doped into anatase type titanium dioxide, then yellow or red colors are developed, but the color range is limited to only yellow and red
Solution Approach 1:
The patent makes the titanium dioxide system multi-functional by enabling it to develop multiple color types (yellow, red, green, blue, purple, black) through different combinations of non-metallic dopants, not limited to only yellow and red
Solution Approach 2:
The patent uses composite doping strategies combining multiple non-metallic elements (nitrogen, boron, sulfur, phosphorus, carbon) in various ratios and crystal structures to achieve a broad spectrum of colors beyond the limitations of single-dopant or anatase-only approaches
3Adaptability or versatility
If complex doping processes are used to develop various colors, then color diversity is achieved, but production complexity increases and environmental load increases
Solution Approach 1:
The patent segments the color development function into discrete dopant types (nitrogen for yellow, boron for red, sulfur/phosphorus/carbon for green/blue/purple/black) that can be independently controlled and combined, simplifying the production process while maintaining color diversity
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 process enables the production of titanium dioxide particles that exhibit various colors beyond red and yellow while maintaining non-toxicity, suitable for applications in paints, cosmetics, and photocatalysts with reduced environmental impact.
Implementation Method 1
performing a hydrothermal reaction using water as a solvent at a high temperature and a high-pressure in presence of an acid or urea
Implementation Method 2
performing a nitriding treatment, and then performing a nitriding treatment in an ammonia gas atmosphere or by mixing with urea or carbon nitride (C3N4)
Data Source
AI summary
An object of the invention is to provide titanium dioxide coloring particles capable of developing colors other than red and yellow while maintaining non-toxicity of titanium dioxide and a titanium dioxide particle mixture containing the titanium dioxide coloring particles, and to provide a method capable of producing the titanium dioxide coloring particles exhibiting the excellent properties by a simple process with a small environmental load. The invention relates to titanium dioxide coloring particles having a brookite type or rutile type crystal structure and co-doped with at least nitrogen and boron, a titanium dioxide particle mixture containing the titanium dioxide coloring particles, and a method for producing the titanium dioxide coloring particles in which a hydrothermal reaction of titanium diboride is caused in presence of an acid or urea, and then a nitriding treatment is performed in an ammonia gas atmosphere or by mixing with urea or carbon nitride.