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Fabrication of ballpoint-ink via encapsulating inorganic pigments in microemulsion gels
The fabrication of ballpoint-ink might open up a new perspective on physico-chemical solubility thermodynamics. In this report, we present a method to encapsulate inorganic pigments, such as Fe(CNS)(3) (red), Fe(2)Fe(CN)(6) (blue), CdS (yellow), and CuS (black) into w/o microemulsion gels. The area...
Autores principales: | , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2022
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9426292/ https://www.ncbi.nlm.nih.gov/pubmed/36128370 http://dx.doi.org/10.1039/d2ra04463c |
Sumario: | The fabrication of ballpoint-ink might open up a new perspective on physico-chemical solubility thermodynamics. In this report, we present a method to encapsulate inorganic pigments, such as Fe(CNS)(3) (red), Fe(2)Fe(CN)(6) (blue), CdS (yellow), and CuS (black) into w/o microemulsion gels. The area of w/o microemulsions was first determined by titrating surfactants Tween-60 into the given composition of water and cyclohexane in the pseudo-three phase diagram. Three prosperous phase areas were successfully mapped using this method, namely: microemulsion (w/o, and o/w) or (μE), lamellar liquid crystal (L(α)), and hexagonal liquid crystal (H(α)), respectively. The results show that inorganic pigments were well soluble in the w/o microemulsion gel of the Tween-60/cyclohexane/water system. The highest solubility of inorganic pigments in the microemulsion gel is 3.63 ± 0.05 mg g(−1) for the red pigment of Fe(CNS)(3), and the lowest is 2.92 ± 0.05 mg g(−1) for the yellow pigment of CdS. Hence, the solubility limit distribution for all pigments is 2.9 ± 0.05 < [Image: see text] >3.63 ± 0.05 mg g(−1). The cation and anion size strongly affected the inorganic pigments' solubility in the w/o-microemulsion system. Some quantity of the ink-made of inorganic pigments encapsulated in the microemulsion gel has been inserted into empty ballpoint sleeves as prototypes. The resulting self-made inks demonstrated that the physical appearances of the ink could mimic the factory-made inks. Nevertheless, the self-made ink should be investigated further for long lifespan use, especially for long-term stability and corrosion resistance. |
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