Smart Materials and Structures
·
2020
·Vol. 29
·期 4
·04LT02
·
IF 3.613
Liangliang Cao,Liang Fang,Xue Li,Shunping Chen,Chunhua Lu,Zhongzi Xu
Chameleons are attractive animals, which can change their colors because of unique layered skin structures. Inspired by this natural design, we explored a layer-by-layer assembly technique to create thermochromic films that can attain reversible and multiple-colors change. Briefly, inorganic pigments and two kinds of thermochromic microcapsules having different responsive temperatures were assembled sequentially onto a piece of filter paper using extraction filtration before epoxy resin was used to seal the whole structure. Different functions including colorful patterns and luminescent letters can be integrated into the system using this versatile approach. More importantly, arrays of thermochromic films were used with a detector and a heating-control circuit to trigger complicated color change by varying detected colors. We believe that this cost-efficient and convenient approach can be used in multiple applications such as camouflage, anti-counterfeiting, smart constructions and buildings, etc.
研究领域:
材料科学
·
仿生学
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Ya-Feng Liu,Qun Liu,Jun-Fei Long,Feng-Lian Yi,Yuan-Qing Li,Xiao-Hua Lei,Pei Huang,Bing Du,Ning Hu,Shao-Yun Fu
Inspired by chameleons’ structural color regulation capability, a simple, but effective, swelling method is proposed for the first time to prepare an ionic polyacrylamide (PAAm) organogel for simultaneous tactile sensing and interactive color changing. The PAAm organogel obtained by swelling the PAAm scaffold in the dimethyl sulfoxide solution of organic electrochromic material (OECM) shows an extremely large stretchability with an elongation of 1600%, a supersoftness with a compressive modulus of 7.2 kPa, an excellent transmittance up to 90%, and a very fast response time of 0.5 s combined with the characteristic of interactive color changing. The PAAm organogel also suggests a universal design ability to tailor coloration spectra for tactile sensors via simply changing the type and content of OECM. The tactile sensor based on a PAAm organogel is capable of serving as a wearable device for precisely tracing human body motion performance and directly visualizing the stress distribution via interactive color changing capability. It is demonstrated that the swelling method proposed here is a simple and practical strategy to prepare ionic organogels with both piezo-resistive and electrochromic effects.
研究领域:
材料科学
·
生物仿生学
·
传感器技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2020
·
IF 8.758
Yadong Yu,Kangren Kong,Zhao Mu,Zhaoming Liu,Ruikang Tang
Chameleons have a distinguished talent to rapidly shift their colors by active tuning of a lattice of guanine nanocrystals within a superficial thick layer of dermal iridophores. This reversible structural color variation is derived from the birefringence, which is triggered by the special anisotropic structure interacting with natural light. Inspired by the inorganic oligomers and their superiorities for constructing ultratough materials with a special structure, we demonstrated here a chameleon’s skin-like film constructed by ultrasmall calcium phosphate oligomers (∼1.75 nm in diameter) as the precursor of crystalline hydroxyapatite nanoline (HNL) arrays and polyvinyl alcohol as the elastic matrix. The resulting films exhibit excellent toughness (48.3 ± 5.2 MJ m–3). Under the applied cyclic stress, the HNLs embedded in the polymer network can reversibly arrange into a highly ordered crystal arrays owing to the driving action of polymer chains. The intense birefringence of the stretched films is easily observed with the naked eye under crossed polarizers, allowing for rapid and simple measurement of the applied stress. This work provides a pathway for the development of functional composites with super toughness by ultrasmall inorganic oligomers for their potential applications in smart devices for stress detection.
研究领域:
材料科学
·
仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Qingwen Shi,Jinxing Liang,Xuyi Wang,Kaixiang Yao,Yidan Tang,Chen Pan,Jiuxiao Sun,Rui Liu,Haiying Tan,Tao Tang
Fire detection plays a crucial role in maintaining the safety of people’s lives and property. However, most early fire detectors are designed to monitor the current or voltage changes of the sensing materials, which require external power supplies. It is still a challenge to make rapid and accurate noncontact early fire detection in precombustion due to the lack of reliable alarm signals. Herein, inspired by the discoloration of chameleon skin, we developed an early fire warning sensor (EFWS) by coating photonic crystals (PCs) on a plastic sheet with thermal expansion properties. Monodispersed zinc sulfide (ZnS) was coated on the plastic sheet as abnormal detection component for EFWS. Combined with the intelligent image recognition algorithm, the EFWS was designed and gave warnings for 0.9 s at 260 °C. For the first time, a photonic crystal-based non-contact real-time monitoring EFWS in precombustion is developed. The sensing material can be directly pasted on the surface of the detected equipment, and combined with existing surveillance cameras in the detection area, early warning of fires can be achieved. The EFWS system can be used in non-open fire alarms for aircraft, buildings, electrical appliances, substations, and other places in the future.
研究领域:
材料科学
·
光学
·
传感器技术
·
智能算法
✓ 已验证
产品关联
DOI
高影响因子
Polymers
·
2023
·Vol. 15
·期 12
·2635
·
IF 5
Yanbo Zhao,Kai Zhao,Zhumin Yu,Changqing Ye
Flexible and stretchable electronic devices are indispensable parts of wearable devices. However, these electronics employ electrical transducing modes and lack the ability to visually respond to external stimuli, restricting their versatile application in the visualized human–machine interaction. Inspired by the color variation of chameleons’ skin, we developed a series of novel mechanochromic photonic elastomers (PEs) with brilliant structural colors and a stable optical response. Typically, these PEs with a sandwich structure were prepared by embedding PS@SiO2photonic crystals (PCs)within the polydimethylsiloxane (PDMS) elastomer. Benefiting from this structure, these PEs exhibit not only bright structural colors, but also superior structural integrity. Notably, they possess excellent mechanochromism through lattice spacing regulation, and their optical responses are stably maintained even when suffering from 100 stretching–releasing cycles, showing superior stability and reliability and excellent durability. Moreover, a variety of patterned PEs were successfully obtained through a facile mask method, which provides great inspiration to create intelligent patterns and displays. Based on these merits, such PEs can be utilized as visualized wearable devices for detecting various human joint movements in real time. This work offers a new strategy for realizing visualized interactions based on PEs, showing huge application prospects in photonic skins, soft robotics, and human–machine interactions.
研究领域:
材料科学
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光学
·
生物仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
·
2025
·
IF 9.7
Shuai Li,Yuanshu Xiao,Jihan Wang,Pengyan Dai,Ying Wang,Hongyan Zhang,Guohua Shan,Lixia Jia
Structural color materials inspired by nature have garnered significant attention in textile dyeing and printing. However, most studies focus on eco-friendly fabric coloring, overlooking the functionality of structural colors. Designing intelligent structural color fabrics that integrate visual sensing and textile finishing technologies presents an ideal yet challenging research opportunity. Herein, a structural color fabric with photoelectric dual-signal outputs that mimics the skin of a chameleon is reported for smart wearable devices, and it is fabricated by integrating knitted fabric with conductive MXene materials and flexible photonic crystal films featuring a non-close-packed structure through thermal bonding, achieving visualized color variation and electrical signal outputs under mechanical strain. The prepared structural color fabric exhibits cyclic and sensitive changes in structural color ( GF f = 2.07) and relative resistance ( GF e = −1.45). It is worth mentioning that the MXene is introduced with two important functions: The primary function of the MXene pertains to the establishment of a conductive network, while the secondary function relates to the absorption of the scattered light produced by the photonic crystals. In addition, the black appearance of the conductive fabric is replaced by an adjustable structural color that serves the user’s aesthetic needs for the product. This work provides novel insights into the development of functional structural color fabrics and demonstrates the great promise of non-close-packed photonic crystals structural color materials for smart wearable applications.
研究领域:
纺织科学
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智能材料
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生物仿生学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Xiaohui Wang,Xiaohui Liang,Yichen Li,Xinyang Li,Guojin Liu,Mingan Hu,Yijia Liu,Yi Huang,Lan Zhou,Wenlong Zhou,Jianzhong Shao
Photonic crystals (PCs) as eco-friendly structural coloring materials have great application potential in the textile coloration. However, the difficulties in scale production of structurally colored fabrics with PCs, as well as in achieving the balance between the structural stability and optical properties of PCs, limit the widespread use of such textiles. Herein, inspired by chameleon skin, the structural coloration of textiles with non-close-packed PCs was designed and prepared. The soft-shell and hard-core PS@P(MMA-BA) nanospheres were designed and prepared via stepwise emulsion polymerization for constructing soft non-close-packed PCs. The liquid photonic crystals (LPCs) were controllably prepared using a rotary evaporation/surfactant method. Therewith, the designed step by step self-assembly method enabled one to realize the controllable assembly of the nanospheres on the fabric surface, whereby the non-close-packed PCs with the cross-linked hard core as the skeleton and the fused soft shell as the filling medium were obtained. On the basis of step by step self-assembly, large-scale structurally colored fabric with non-close-packed PCs was prepared by continuous pilot equipment. The prepared structurally colored textiles possess high structural stability and color saturation, as well as the mechanochromic properties, and has the potential as a smart textile.
研究领域:
材料科学
·
纺织工程
·
光学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·Vol. 35
·期 25
·2300615
·
IF 29.4
Shuxin Wei,Wei Lu,Huihui Shi,Shuangshuang Wu,Xiaoxia Le,Guangqiang Yin,Qingquan Liu,Tao Chen
Intelligent rewritable display systems have been long expected to reduce the heavy consumption of single-use or transient devices in the age of Internet-of-Things. However, it remains challenging to construct such systems with integrated functionality of remote control, rapid activation, multicolor and multimode display. Herein, by learning from the unique multilayer arrangement of chromatophores in chameleon skins, a promising kind of rewritable hydrogel multicolor systems is presented that can combine the merits of near-infrared (NIR) light-writing and projecting modes for on-demand information display. Specifically, the systems have typical multilayer layout consisting of poly(dimethylsiloxane) (PDMS)-sealed carbon nanotubes (CNTs) film as photothermal control unit and embedded fluorescent hydrogels as multicolor display unit, in which thermoresponsive hydrogel is constrained within non-responsive hydrogel. Such rational structure design results in the establishment of one promising display mechanism via the cascading “light trigger–heat generation–fluorescence output” process. On this basis, rapid and reversible hand-written display of arbitrary information is achieved within 5 s. Also, sustainable light-projecting display of predesigned multicolor patterns is demonstrated due to the multilayer design that ensures easy patterning of photothermal control or hydrogel display layer. This study brings functional-integrated merits for novel rewritable display systems and open new possibility to construct high-end products for information display/transmission.
研究领域:
材料科学
·
光电技术
·
显示技术
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Yang Hu,Boru Wei,Dongpeng Yang,Dekun Ma,Shaoming Huang
The skins of chameleons have attracted growing interest because they have sensitive mechano-chromic properties and bright colors due to the large surface-to-surface distances (Ds–s) between neighboring particles and contrast of the refractive index (Δn), respectively. Inspired by these, artificial mechano-chromic photonic skins (MPSs) mimicking those of chameleons were fabricated by the large Δn and Ds–s. The fabrication is considerably simple and efficient based on the self-assembly strategy using commercial chemicals and materials. The reflectance of MPSs depends on the value of Δn, which can be greatly increased to 70% with a Δn of 0.035, leading to their brilliant colors. Because of the large Ds–s, the MPSs possess outstanding mechano-chromic performances, including a large maximal (Δλ = 205 nm) and effective (Δλe = 184 nm) tuning range of the reflection wavelength, high sensitivity (368), fast responsiveness (2.2 nm/ms), good stabilities (>1 year), and reversibility (>100 times). Based on these advantages, MPSs have been used for self-reporting the strain of earthworms by outputting diverse colors during the peristaltic process, indicating the great potential of the MPSs as visual sensors and optical coatings.
研究领域:
材料科学
·
生物仿生学
·
光学传感器
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Lijun Cai,Yu Wang,Dongyu Xu,Hanxu Chen,Yuanjin Zhao
Colorful pigments have demonstrated values in constructing dynamic patterns for different applications. Attempts in this field tend to develop pigments with multiple modes for color variation. Herein, inspired by the color variation mechanism of chameleons, we propose a novel kind of pigments with dual color variations (PDCVs) by integrating hydrophobic carbon dots (HCDs) within photonic crystal (PhC) particles. The HCDs with blue dispersion emission and red aggregation-induced emission are generated via one-pot solvothermal treatment. The PDCVs are generated by using HCDs-tagged responsive hydrogel to replicate the nanostructure of silica nanoparticles assembled spherical PhC particles. As the dispersion/aggregation of HCDs and hydrogel lattice of the PhC are depending on their surrounding solvent, the resultant PDCVs can perform dual color variations, including fluorescence and structure color, by changing their solvent. Based on this feature, we have demonstrated that the PDCVs can be employed as elements to construct various dynamic colorful patterns with wide viewing angle and allow for eminent information encryption. There results indicate that the proposed PDCVs are promising to have practical applications in the fields of information encryption, displaying, anti-counterfeiting, and so on.
研究领域:
材料科学
·
光学
·
纳米技术
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Wei Cai,Liangyuan Qi,Tianyang Cui,Bicheng Lin,Mohammad Ziaur Rahman,Xin Hu,Yang Ming,Ah Pun Chan,Weiyi Xing,De-Yi Wang,Bin Fei,Jintu Fan
Toward addressing the aesthetic demand, IR emissivity, and fire hazards of radiative cooling materials in the practical application, chameleon-inspired is tactfully employed, dipole moment-increasing, and fire-retardant strategies to manufacture an advanced polyurea-based composite coating through incorporating thermochromic microcapsules, boron nitride nanosheets, and montmorillonite nanosheets. The chameleon-inspired thermochromic microcapsules and admirable IR emissivity (supported by the original IR emittance spectra) realized by the increasing dipole moment allow the composite coatings to spontaneously adjust the solar absorption and reflection during hot daytime, while enabling high-efficiency radiative cooling throughout the day. The IR emissivity higher than most literature is attributed to the strong interfacial interactions within polyurea composite coatings which improve the dipole moment of C─O─C, Si─O, and B─N bonds by increasing the distance between the centers of positive and negative charges, thus producing more IR emissions. Furthermore, the thermally melted montmorillonite nanosheets can form a ceramic protective layer enhanced by boron nitride nanosheets, further suppressing combustion behavior to improve the fire safety performance of polyurea coatings. The integration of thermochromic functionality, high fire safety, and admirable IR emissivity not only contribute to promoting the practical application of radiative cooling materials, but also provide a precious reference route to design high IR emissivity.
研究领域:
材料科学
·
热能工程
·
涂层技术
·
防火安全工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Yudong Sun,Xuefen Li,Tong Hu,Shufen Zhang,Wenbin Niu
Advanced skin systems realize perception and interaction with the environment through synergistic electrical and color signals generated by transmitting ions and manipulating photonic structures. Here, inspired by chameleon skins, a novel self-healing and resilient photonic-ionic skin (PI-skin) with electro-optical dual response is ingeniously constructed integrating the ordered micro-nano array and the dynamically covalently cross-linked ionogel. The elaborately designed polycation network with weak inter-chain interactions can promote the uniform distribution of high-content low-viscosity ionic liquid (IL), effectively eliminating energy dissipation and resulting in high resilience. Dynamic acylhydrazone bonds are served as reversible chemical crosslinking to realize high-efficiency self-healing and further enhance resilience. Notably, the artificially manipulated transition of the photonic array from dense packing to non-dense packing endows sensitive chromotropic properties synchronized with electrical response under stretched (Δλ > 130 nm) and compressed (Δλ > 160 nm). Furthermore, by harnessing the correspondence between electrical and optical signals, the control of optical signals over electrical signals is achieved for inputting complex coded information and constructing interactive human–machine interfaces. This work not only inspires the design and construction of high-level artificial skins but also stimulates the development of visual interactive devices and smart electronic/ionic products.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
光电技术
·
人机交互
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）