Anisotropic mechano-adaptive cavitation in elastomers for unclonable covert–overt anti-counterfeiting

Zhao, Huaixia; Li, Boya; Wang, Yangxin; Zhou, Xiaozhuang; Cui, Jiaxi

doi:10.1039/d1tc06136d

Cited by 10 publications

(24 citation statements)

References 43 publications

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“…Interestingly, the porous structures made by this strategy may show mechano‐stimuli responsiveness, that is, the cavities can be closed by compression but open by stretching force 23 . This appealing function is also found in the anisotropic systems made from anisotropic droplet‐embedded structures 31 …”

Section: Fabrication Methods Of Droplet‐embedded Soft Materialsmentioning

confidence: 79%

“…Information encryption can also be achieved through switchable porous elastomers made from water droplet‐embedded polymers. As discussed in the section on water droplet‐embedded polymers, water volatilization would lead to switchable creases in PDMS 23,31 . These creases can even be orientated by deforming the droplets in the matrices.…”

Section: Optical Modulationsmentioning

confidence: 99%

Section: Optical Modulationsmentioning

confidence: 99%

“…The materials are made from viscous PDMS‐water emulsions, allowing easy fabrication as a typical PDMS precursor. By taking this advantage, mechano‐sensitive optical patterns with programmable anisotropy can be designed by integrating several 2D pattern films into a sample encrypted with 3D information 31 . Since every 2D information will be deciphered in its own direction, the right information hidden in the sample can only be read out under the correct mechano‐stimuli order.…”

Section: Optical Modulationsmentioning

confidence: 99%

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Droplets in soft materials

Wang

Xiong

Yang

et al. 2022

Droplet

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Droplets display many unique properties in soft solid matrices, leading to various fascinating phenomena. These phenomena have inspired multidisciplinary scientific designs involving both fundamental studies and application exploration in the fields of physics, mechanics, chemistry, materials, biology, and so on. These emerging researches are diverse, ranging from artificial trees to antifouling coatings, and have not been concluded from the viewpoint of their composite structures, that is, droplet-embedded soft materials. A comprehensive understanding of these structures will favor the designs of new systems with various predictable properties. We thus review the recent progress of this topic here. This contribution starts from the basic structural characteristics of the droplet-embedded soft materials in the introduction section, followed by the section describing the main fabrication methods to create droplets in soft materials. In the third part, we divide the reported examples into five categories based on the hydrophobicity of the droplets and the miscibility between droplets and matrices and discuss their properties.Afterward, the applications of these systems with droplets are discussed, including self-healing, antifouling surfaces, anticounterfeiting, radiative cooling, and so on. Finally, the promising developments and facing challenges of this topic are proposed. We envision that this review can deliver a comprehensive understanding of droplets in soft matrices and promote the development of this topic.

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Section: Fabrication Methods Of Droplet‐embedded Soft Materialsmentioning

confidence: 79%

Section: Optical Modulationsmentioning

confidence: 99%

Section: Optical Modulationsmentioning

confidence: 99%

Section: Optical Modulationsmentioning

confidence: 99%

See 2 more Smart Citations

Droplets in soft materials

Wang

Xiong

Yang

et al. 2022

Droplet

Self Cite

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show abstract

“…[ 64 ] Generally, the anticounterfeiting modes for mechanochromic PCs are the exposure of hidden information, disappearance of visible information, and color shifting in patterns. [ 65 ] Methods for the selective stimulation of elastic materials by an external force and differentiated design of mechanochromic performance in different regions have been developed to visualize encrypted information. Mechanical force can be applied under any circumstance, which makes mechanochromic RPCs the most convenient materials for information encryption and decryption.…”

Section: Strategies For Advanced Security Via Rpcsmentioning

confidence: 99%

Stimulus‐Responsive Photonic Crystals for Advanced Security

Wang

Zhou

Liu

et al. 2022

Adv Funct Materials

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Counterfeiting is a growing global issue causing severe negative impacts on the social economy and posing serious security threats to individuals and communities. However, the current anticounterfeiting technologies are relatively well known to fakers and lack sufficient security owing to the development and commercialization of high‐resolution equipment. Thus, designing new anticounterfeiting materials and systems is urgently needed. Photonic crystals (PCs) with vivid structural colors are promising materials for advanced security applications because of their unique optical characteristics. In particular, responsive PCs (RPCs), whose optical signals can be readily adjusted by external stimuli, are expected to provide improved security and may be used to determine the authenticity of banknotes, documents, and drugs. In this review, the strategies are summarized for designing RPCs, including filling responsive materials into the interstitial space of periodic photonic structures and using responsive materials as construction blocks of PCs. Subsequently, the latest progress in developing RPCs constructed for optical encryption and information security is discussed in detail. Finally, the challenges and outlook of using RPCs for optical encryption technologies are presented.

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Stimuli–Responsive Mechanoadaptive Elastomeric Composite Materials: Challenges, Opportunities, and New Approaches

Dolui,

Natarajan,

et al. 2023

Adv Eng Mater

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Stimuli‐responsive mechano‐adaptive materials, capable of reversibly changing their mechanical properties when exposed to an external stimulus, are the next generation of smart materials with immense transformative potential for various technological applications. Although the concept of adaptive mechanical properties has been proven for some materials, it remains very challenging for soft elastomeric materials. The aim of this review is to provide new ideas and strategies for the development of mechano‐adaptive elastomeric composites using commercial rubber as the matrix polymer. The fundamental question addressed here is: How do the phase‐responsive functional fillers alter the mechanical properties? For a given physical network environment, what is the mechanism that gives rise to the stimuli‐responsive properties of the resulting composites?? This paper summarizes the preparation, structure and properties of recently developed mechano‐adaptive elastomeric materials. Furthermore, based on their structure‐property relationships, plausible applications of these smart materials in various technology‐specific applications such as soft robotics, actuators, sensors, smart tires, automotive design, aerospace etc. are demonstrated with representative examples. Finally, the paper critically discusses the existing challenges in the field of mechano‐adaptive elastomers in order to provide valuable insights in this area.This article is protected by copyright. All rights reserved.

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Anisotropic mechano-adaptive cavitation in elastomers for unclonable covert–overt anti-counterfeiting

Abstract: Mechano-responsive structural coloration is especially valuable for information encryption due to the convenience of visualization and the simple authentication procedure. Here, a class of anisotropic photonic polydimethylsiloxane (PDMS) elastomers are...

Cited by 10 publications

References 43 publications

Droplets in soft materials

Droplets in soft materials

Stimulus‐Responsive Photonic Crystals for Advanced Security

Stimuli–Responsive Mechanoadaptive Elastomeric Composite Materials: Challenges, Opportunities, and New Approaches

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