| Dec 15, 2022 |
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(Nanowerk Information) Counterfeiting threatens the worldwide financial system and safety. Based on the report issued by the US Patent and Trademark Workplace (USPTO) in 2020, the worth of worldwide counterfeit and pirated merchandise is estimated between US$ 1.7 and 4.5 trillion a yr. Regardless of monumental efforts, standard anticounterfeiting approaches corresponding to QR codes will be simply fabricated as a result of restricted information encryption capability on a planar house. How can we improve the encryption density in a restricted house?
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The crew led by Dr Ji Tae Kim from the Division of Mechanical Engineering on the College of Hong Kong (HKU) has developed a high-precision 3D printing technique that may produce new polarisation-encoded 3D anticounterfeiting labels. This new 3D label can encrypt extra digital data than a standard 2D label.
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The work has been printed in Nano Letters (“Three-Dimensional Printing of Dipeptides with Spatioselective Programming of Crystallinity for Multilevel Anticounterfeiting”).
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| Scheme: 3D printing strategy of polarization-encoded 3D micro-pixels. (Picture: The College of Hong Kong)
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Diphenylalanine (FF), a species of dipeptides, was chosen as a fabric for information encryption as a result of its distinctive optical properties. Dr Jihyuk Yang from the Division of Mechanical Engineering, HKU, defined: “FF has lengthy attracted nice consideration to neuroscientists as a result of its affiliation with Alzheimer’s illness. Lately, FF is rising as a brand new digital and photonic gadget materials as a result of its distinctive properties – e.g. piezoelectricity and optical birefringence – arising from crystalline nature.” Dr Yang is the primary writer of the paper.
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“Our new 3D printing technique mixed with nature-driven molecular self-assembly can print multi-segmented 3D FF micro-pixels with programmed crystallinity for high-density information encryption. By utilising totally different responses of the amorphous and crystalline segments to polarised mild, a tiny single 3D pixel can encrypt a multi-digit binary code consisting of “0” and “1″.
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The data capability will be elevated to 211 with a single eleventh-segmented freestanding pixel on a tiny 4 µm2 space which is 1000 instances smaller than a hair strand,” mentioned Dr Ji Tae Kim. He believes that 3D printing expertise will be successfully used to customize safety labels on-demand wherever and anytime, contributing to strengthening the knowledge safety of people and corporations.
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