Surface Functionalized Titanium Dioxide Nanoparticles for Optical Coatings
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Solution Overview
Problem
Titanium dioxide nanoparticles prepared by the sol-gel method tend to agglomerate and precipitate, requiring appropriate treatment for storage and applications in printing lacquers, and their refractive index is diluted when coated with organic materials, making it challenging to maintain high refractive index and stability.
Innovation Solution
A sol-gel process is developed to produce transparent, redissolvable titanium dioxide nanoparticles with a refractive index greater than 1.70, involving the use of concentrated hydrogen chloride and ethanol to achieve nanoparticles with sizes between 1 nm to 40 nm, which are surface functionalized with phosphonates and alkoxides for enhanced stability and refractive index.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If titanium dioxide nanoparticles are prepared by sol-gel method, then they can be produced with controlled size, but they tend to agglomerate and precipitate requiring appropriate treatment
Solution Approach 1:
The patent introduces phosphonate compounds as intermediary substances that adsorb onto the surface of titanium dioxide nanoparticles. These phosphonates act as stabilizing agents that prevent agglomeration and precipitation by creating a protective layer around the particles, while still allowing the nanoparticles to maintain their controlled size distribution achieved through sol-gel processing.
Solution Approach 2:
The patent creates composite structures by combining titanium dioxide nanoparticles with phosphonate coatings. This composite approach integrates the size-control advantages of sol-gel method with the stability benefits of phosphonate-functionalized surfaces, resulting in nanoparticles that are both uniformly sized and resistant to agglomeration.
2Stability of the object's composition
If titanium dioxide nanoparticles are coated with organic materials, then they gain stability and solubility, but their refractive index is diluted
Solution Approach 1:
The patent changes the chemical parameters of the surface coating by using phosphonate compounds instead of conventional organic materials. Phosphonates provide stability and solubility while having minimal impact on the refractive index, thus maintaining the optical properties of the titanium dioxide nanoparticles.
Solution Approach 2:
The patent applies phosphonate functionalization locally at the surface of the nanoparticles rather than using bulk organic coatings. This localized approach provides the necessary stability and solubility at the particle surface while leaving the core titanium dioxide material and its refractive index properties intact.
3Reliability
If conventional organic coatings are used on titanium dioxide nanoparticles, then stability is improved, but refractive index is diluted
Solution Approach 1:
The patent uses phosphonate compounds as intermediary substances that provide stability through strong bonding to the titanium dioxide surface. These phosphonate intermediaries offer a alternative to conventional organic coatings that maintain both stability and refractive index properties.
Solution Approach 2:
The patent changes the chemical composition parameter of the coating from conventional organics to phosphonates, which fundamentally alters the interaction with the titanium dioxide surface. This parameter change enables simultaneous achievement of stability and preservation of refractive index.
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 resulting surface functionalized titanium dioxide nanoparticles are stable, soluble in organic solvents, and maintain a high refractive index, making them suitable for use in coatings for holograms, wave guides, and solar panels without significant refractive index dilution.
Implementation Method 1
adding a solution of concentrated hydrogen chloride (33% in water) diluting this solution with half volume of distilled water (60-29.8/volume-volume) diluting this solution with additional ethanol (90-1910/volume-volume) resulting in solution I to a solution of titanium-tetra-iso-propoxide first stirred in (absolute) ethanol (10-90/weight-volume) resulting in a solution II
Implementation Method 2
surface functionalized with phosphonates and alkoxides for enhanced stability and refractive index
Implementation Method 3
evaporating the mixture until the weight remains constant
Data Source
AI summary
The present invention relates to surface functionalized titanium dioxide nanoparticles, a method for its production, a coating composition, comprising the surface functionalized titanium dioxide nanoparticles and the use of the coating composition for coating holo-grams, wave guides and solar panels. Holograms are bright and visible from any angle, when printed with the coating composition, comprising the surface functionalized tita-nium dioxide nanoparticles.