Inkjet-printed pH-sensitive QR code labels for real-time food freshness monitoring

In this work, dynamic pH-sensitive quick response code (QR code) labels have been successfully fabricated by inkjet-printing technology. Inks with roselle anthocyanins and curcumin natural dye are prepared, respectively. The rheological property, contact angle, and surface tension of the prepared in...

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Veröffentlicht in:Journal of materials science 2021-11, Vol.56 (33), p.18453-18462
Hauptverfasser: Xu, Yuan, Liu, Zhangming, Liu, Rui, Luo, Mengxue, Wang, Qi, Cao, Liqin, Ye, Shuangli
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container_end_page 18462
container_issue 33
container_start_page 18453
container_title Journal of materials science
container_volume 56
creator Xu, Yuan
Liu, Zhangming
Liu, Rui
Luo, Mengxue
Wang, Qi
Cao, Liqin
Ye, Shuangli
description In this work, dynamic pH-sensitive quick response code (QR code) labels have been successfully fabricated by inkjet-printing technology. Inks with roselle anthocyanins and curcumin natural dye are prepared, respectively. The rheological property, contact angle, and surface tension of the prepared inks are tested. Both inks show good printability with Newtonian fluid property. The QR code labels with different ratios of inks are fabricated, in which the ink ratio is controlled by automatic computer program. It can be seen that the color of all printed QR code labels is sensitive to the concentrations of ammonia solutions, demonstrating that the pH-sensitive QR code labels are achieved. The ammonia-dependent color difference is analyzed by L*a*b* digital images. It can be found that the color difference strongly depends on the ink ratio, which suggests that the QR code labels with different ink ratios can be applied for diverse food freshness monitoring in real time. Therefore, in future, combined with the QR code application program (QR code APP) of intelligent devices, the developed QR code labels can be used as data carrier and freshness sensor as well, which provides a convenient method to get comprehensive food information, including freshness, expected storage time, date and identification of product, etc. Graphical abstract
doi_str_mv 10.1007/s10853-021-06477-x
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subjects Ammonia
Anthocyanin
Anthocyanins
Automatic identification
Bar codes
Characterization and Evaluation of Materials
Chemical Routes to Materials
Chemistry and Materials Science
Classical Mechanics
Color
Contact angle
Crystallography and Scattering Methods
Digital imaging
Food
Freshness
Hydrogen-ion concentration
Inkjet printing
Inks
Labels
Materials Science
Monitoring
Newtonian fluids
Polymer Sciences
Printing-ink
Real time
Rheological properties
Solid Mechanics
Surface tension
title Inkjet-printed pH-sensitive QR code labels for real-time food freshness monitoring
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