Plasmonic inks with vivid colors
AssigneesSociete BIC, Universite De Haute Alsace, Centre National De La Recherche Scientifique
InventorsGuillaume CAFFIER, Karine MOUGIN, Feriel GHELLAL, Arnaud SPANGENBERG
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Abstract
The present application relates to a writing instrument comprising a writing tip and an ink reservoir connected to the writing tip, wherein the ink reservoir is sized to contain at least 100 μl of ink and contains an aqueous gel ink, comprising metal nanoparticles as coloring agent, wherein said metal nanoparticles essentially consist of metal and said metal is chosen from silver, gold, aluminum and/or copper, and a dispersing agent; wherein metal nanoparticles are contained within the aqueous gel ink in an amount of 0.5-2.5 wt.-%, relative to the total weight of the ink; and wherein the writing instrument is configured to dispense 150-800 mg/100 m.
Claims21
A writing instrument comprising a writing tip and an ink reservoir connected to the writing tip, wherein the ink reservoir is sized to contain at least 100 μl of ink and contains an aqueous gel ink, comprising:
- metal nanoparticles as coloring agent, wherein said metal nanoparticles essentially consist of metal and said metal is chosen from silver, gold, aluminum and/or copper, and
- a dispersing agent
- wherein metal nanoparticles are contained within the aqueous gel ink in an amount of 0.5-2.5 wt.-%, relative to the total weight of the ink;
- and wherein
- the writing instrument is configured to dispense 150-800 mg/100 m.
2-17. (canceled)
A process for preparing an aqueous gel ink comprising metal nanoparticles which essentially consist of metal and wherein said metal is selected from silver, gold, aluminum and/or copper, comprising the following steps:
- (i) preparing a gel-based matrix for an aqueous gel ink;
- (ii) preparing an aqueous suspension of metal nanoparticles, wherein said metal nanoparticles essentially consist of metal and said metal is selected from silver, gold, aluminum and/or copper, by mixing a metal salt, wherein the metal salt comprises silver ions, gold ions, aluminum ions and/or copper ions, with:
- water,
- one or more reducing agents,
- and a dispersing agent.
- (iii) concentrating the aqueous suspension obtained in step (ii) by centrifugation and/or filtration;
- and
- (iv) adding the concentrated aqueous suspension of nanoparticles obtained in step (iii) to the gel-based matrix obtained in step (i).
Dependencies are inferred from the claim text.