Silver Nanoparticle Inkjet Ink for Metallic Luster and Conductivity
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Solution Overview
Problem
Metallic inks, particularly those containing costly metals like gold and palladium, tend to lose their luster over time and are not economically viable for commercial printing, while alternatives made from non-metallic solutions often exhibit dull colors and high viscosities, and some metals like copper are reactive, leading to loss of conductivity.
Innovation Solution
The development of inkjet inks using silver colorants, such as metallic silver pigments or nanoparticles, combined with other pigments or dyes to create metallic-colored inks like gold, copper, and bronze, which are more cost-effective and less toxic, and suitable for inkjet printing, with the silver nanoparticles being produced through chemical reduction methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If costly metals like gold, palladium, or platinum are used in metallic inks, then the ink exhibits high metallic luster and electrical conductivity, but the manufacturing cost increases significantly making it economically impractical
Solution Approach 1:
The patent replaces expensive precious metals (gold, palladium, platinum) with cheaper alternative metals such as aluminum, zinc, or their alloys. These cheaper metals can be oxidized to form protective oxide layers that maintain metallic luster and electrical conductivity while significantly reducing material cost, making the ink economically viable for commercial applications.
Solution Approach 2:
The patent employs composite structures where metal particles are combined with oxide layers or coating materials. This composite approach allows the base metal to provide electrical conductivity and cost-effectiveness, while the oxide or coating layer preserves metallic luster and protects against further oxidation, achieving both performance and economic goals.
2Reliability
If reactive metals like copper are used in metallic inks, then the ink provides good electrical conductivity and metallic appearance, but the metal reacts with environmental elements causing loss of conductivity over time
Solution Approach 1:
The patent applies preliminary protective measures by forming stable oxide layers on the metal particles before they are exposed to the environment. These pre-formed oxide layers act as barriers that prevent further reaction between the reactive metal and environmental elements like oxygen and moisture, thereby preserving electrical conductivity over time.
Solution Approach 2:
The patent converts the harmful effect of metal oxidation into a beneficial protective mechanism. By controlling the oxidation process to form stable, adherent oxide layers, the normally detrimental reaction becomes a protective shield that prevents further degradation of the metal particles while maintaining the desired metallic properties.
3Ease of manufacture
If non-metallic solutions or metallized organic pigments are used instead of true metals, then the manufacturing cost decreases, but the ink exhibits dull color and reduced metallic luster
Solution Approach 1:
The patent changes the physical and chemical parameters of the ink formulation by using very fine metal particle dispersions (nanoscale particles) combined with specific dispersants and vehicle compositions. This allows true metal particles to be used at low concentrations, providing authentic metallic luster while keeping costs lower than traditional precious metal inks.
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 inks provide high metallic luster, are more affordable, and maintain conductivity, making them suitable for various printing applications while being less toxic and more stable than traditional copper-based inks.
Implementation Method 1
the silver nanoparticles being produced through chemical reduction methods
Data Source
AI summary
A metallic inkjet ink includes a silver metallic colorant, another colorant and at least one ink vehicle. The other colorant is selected from a pigment, a dye, and combinations thereof. Also disclosed herein is a method of forming the metallic inkjet ink including providing an ink vehicle, adding the silver colorant to the ink vehicle, and adding the other colorant to the ink vehicle.