Dynamic borate ester bonds mediated patterned anisotropic hydrogels for information encryption

IF 4.1 2区 化学 Q2 POLYMER SCIENCE
Zengbin Song, Zhaodi Yi, Mingrui Wu, Ming He
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引用次数: 0

Abstract

Hydrogels with oriented structures exhibit birefringence and display different interference colors between crossed polarizers, which has attracted increasing attention in the fields of information encryption. However, it remains a challenge to introduce complex anisotropic microstructures into hydrogels and enabling them to display high-resolution interference patterns with erasable and rewritable properties. In this study, we report a uniaxially oriented anisotropic polyvinyl alcohol (PVA) hydrogel mediated by dynamic borate ester bonds. Different high-resolution interference patterns can be written or transfer-printed quickly by disrupting the localized PVA-B(OH)4complex structures with HCl solution. The reversible formation and dissociation of the PVA-B(OH)4 complex structures allow the interference pattern to be repeatedly erased and rewritten. The excellent stability of the crystalline domains of PVA confers the ability for reversible transformation between hydrogel and dry film states without compromising the accuracy and reliability of the pattern information. The created dry film with a fingerprint pattern can be used to assemble an unforgeable card, which can instantly display a fingerprint pattern in front of a cell phone screen. Double encryption of the patterned information was achieved by drying the patterned hydrogel into a curly shape and utilizing its three-dimensional structure to increase the security of the information.

Abstract Image

Abstract Image

动态硼酸酯键介导的图案各向异性水凝胶用于信息加密
具有定向结构的水凝胶具有双折射特性,在交叉偏振光之间显示出不同的干涉颜色,在信息加密领域受到越来越多的关注。然而,将复杂的各向异性微结构引入水凝胶并使其具有可擦除和可重写特性的高分辨率干涉图案仍然是一个挑战。在这项研究中,我们报道了一种由动态硼酸酯键介导的单轴取向各向异性聚乙烯醇(PVA)水凝胶。用HCl溶液破坏局部PVA-B(OH)4−络合物结构,可以快速写入或转移打印不同的高分辨率干涉图案。PVA-B(OH)4−络合物结构的可逆形成和解离使得干涉图案可以被反复擦除和重写。PVA晶体结构优异的稳定性赋予了在水凝胶和干膜状态之间可逆转化的能力,而不会影响图案信息的准确性和可靠性。这种带有指纹图案的干膜可以用来组装一张不可伪造的卡片,这种卡片可以立即在手机屏幕前显示指纹图案。通过将图案水凝胶干燥成卷曲形状并利用其三维结构来增加信息的安全性,实现了图案信息的双重加密。
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来源期刊
Polymer
Polymer 化学-高分子科学
CiteScore
7.90
自引率
8.70%
发文量
959
审稿时长
32 days
期刊介绍: Polymer is an interdisciplinary journal dedicated to publishing innovative and significant advances in Polymer Physics, Chemistry and Technology. We welcome submissions on polymer hybrids, nanocomposites, characterisation and self-assembly. Polymer also publishes work on the technological application of polymers in energy and optoelectronics. The main scope is covered but not limited to the following core areas: Polymer Materials Nanocomposites and hybrid nanomaterials Polymer blends, films, fibres, networks and porous materials Physical Characterization Characterisation, modelling and simulation* of molecular and materials properties in bulk, solution, and thin films Polymer Engineering Advanced multiscale processing methods Polymer Synthesis, Modification and Self-assembly Including designer polymer architectures, mechanisms and kinetics, and supramolecular polymerization Technological Applications Polymers for energy generation and storage Polymer membranes for separation technology Polymers for opto- and microelectronics.
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阿拉丁
Polyvinyl alcohol (PVA 1799)
阿拉丁
Polyvinyl alcohol
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