Sessile microdroplet-based writing board for patterning of structural coloured hydrogels

Zhang, Jing, Qin, Yipeng, Shen, Yu, Jiang, Chao, Tao, You-Tian, Chen, Su, Xu, Bin and Yu, Ziyi (2020) Sessile microdroplet-based writing board for patterning of structural coloured hydrogels. Advanced Materials Interfaces. ISSN 2196-7350 (In Press)

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Abstract

The patterning of structural coloured materials has a significant impact on various applications such as flexible displays, anti-counterfeiting patches, colourimetric sensors, etc. Herein, a sessile microdroplet-based writing board is presented to pattern magnetochromatic hydrogels with abundant structural colours and improved optical performance. It is demonstrated that predesigned hydrophilic patterns on a hydrophobic writing board can capture a mixture of polymer and Fe3O4@SiO2 magnetic nanoparticles inks with a spatial resolution of ca. 100 pin per 1 cm2 while retaining magnetic field responsibility to the lower limit of 84 Gs. The inks are self-partitioned into microdroplet arrays, which would in situ transform into structural coloured hydrogels within a short time via thiol-Michael addition. In contrast to conventional evaporation induced assembly of colloidal photonic crystals in sessile droplets, the resulting structural coloured hydrogel microarrays show not only good stability and optical adjustability but tunable morphologies. In addition, the introduction of the microfluidic mixing and ink dispensing system greatly shortens the time interval from the polymer mixing to sessile droplet generation, circumvents the challenge of short operation time for the self-crosslinking ink components, and enables the direct handwriting of high quality structural coloured patterns.

Item Type: Article
Uncontrolled Keywords: sessile microdroplets, photonic crystals, patterning, structural colours
Subjects: F200 Materials Science
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: John Coen
Date Deposited: 25 Aug 2020 10:27
Last Modified: 25 Aug 2020 10:30
URI: http://nrl.northumbria.ac.uk/id/eprint/44178

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