ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Dong-Xue Xia,Chen-Yan Xu,Ming-Fu Ye,Rui-Lian Lin,Jing-Xin Liu
Multi-stimuli-responsive chromic materials have immense potential for utilization. Herein, two supramolecular inclusion complexes were prepared by self-assembly of β-cyclodextrin (β-CD) with dialkylcarboxyl-substituted viologens, N,N′-di(3-carboxy-propyl)-4,4′-bipyridinium dichloride (CPV·Cl2) and N,N′-di(6-carboxy-hexyl)-4,4′-bipyridinium dibromide (CHV·Br2). The self-assembled inclusion complexes CPV2+@β-CD and CHV2+@β-CD2 in the solid-state exhibited naked-eye photochromism, thermochromism, and electrochromism in response to multiple external stimuli including light, temperature, and electric field, respectively. Solid-state UV–vis diffuse reflectance and electron spin resonance (ESR) spectroscopy revealed that the observed photochromism, thermochromism and electrochromism are attributed to the formation of viologen free radicals induced by electron transfer under external stimuli. The excellent stimuli-response chromic properties of the title inclusion complexes support their practical utility in visual display, multiple anticounterfeiting, and multilevel information encryption.
研究领域:
材料科学
·
超分子化学
✓ 已验证
DOI
PubMed
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2020
·Vol. 44
·期 36
·15350-15353
·
IF 3.288
Mei Gao,Chaofan Lian,Rang Xing,Jie Wang,Xuefei Wang,Zhiyuan Tian
The optimal storage temperature for vaccines ranges from 2 °C to 8 °C. Electronic thermometers can provide real-time and remote temperature monitoring but are not applicable for individual packages. However, it is known that few alkanes have melting points in this range. The photo-induced conversion of colorless spiropyran to blue merocyanine can be thermally reversed, resulting in decoloration. By dispersing spiropyran in a mixture of n-tetradecane and n-pentadecane with the melting point of 8 °C, an accurate and low-cost thermochromism indicator to record temperature abuse has been designed. The results showed that the thin label based on this system has taken a permanent decoloration within 10 min of the temperature exceeding 8 °C.
研究领域:
生物化学
·
制药工程
✓ 已验证
产品关联
DOI
高影响因子
OPTICAL MATERIALS
·
2023
·
IF 3.9
Jiao Qu,Binquan Zhao,Qi Zhu
In the field of information encryption, multi-mode luminescent materials that can emit light in response to different forms of excitation are very important. Here, ZnAl 2 O 4 : x Ti 4+ ( x = 0, 0.25%, 0.5%, 0.75%, 1%, 1.25%) and ZnAl 2 O 4 :1%Ti 4+ , y Cr 3+ ( y = 0.1%, 0.2%, 0.3%) optical materials were synthesized by solid-state reaction method. The crystal structure does not significantly change after doping Ti 4+ and Cr 3+ . The single-doped Ti 4+ samples output blue light at 440 nm. Further doping Cr 3+ with y = 0.1%, 0.2% and 0.3%, the emission color shifts from blue to red under 254 nm excitation. There is energy transfer of Ti 4+ →Cr 3+ , and the largest efficiency is 54.0% at y = 0.3%. Because the thermal stabilities of emissions for Ti 4+ and Cr 3+ are quite different, the emissions at 440 nm (Ti 4+ ) and 700 nm (Cr 3+ ) exhibit significantly different responses to temperature. Furthermore, varying the excitation lights from 254 nm to 365 nm also yields different light outputs. Finally, three typical samples were designed for letters “CHN”. The “CHN” logo outputted lights of different colors at different temperatures, and the optical signals varied under different excitations. The colorful emission with different modes can be coded to achieve the application of multi-mode anti-counterfeiting, indicating that they have broad application prospects in this area.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
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
Journal of Bionic Engineering
·
2022
·Vol. 19
·期 6
·1589-1600
·
IF 2.995
Wang Peng,Zhang Xuesong,Wang Zhihao,Chen Tao,Zhang Honglian,Duan Wei,Han Huilong
Both thermochromic and photochromic coating have attracted many attentions due to their widely applications, but the low stability is a big obstacle. Inspired by the lotus leaf, to endow the chromic coating with superhydrophobicity is a possible solution. In this research, a dual response coating was prepared by adding photochromic and thermochromic particles simultaneously. The prepared sample demonstrated at least four-state color switching, which can be successfully used in tactile imaging, multi-color fabric, erasable record, and security labels. The superhydrophobicity was achieved by introducing vinyl-terminated polydimethylsiloxane, which not only offers low surface energy but also can cross-link with the particles to increase the adhesion. Thus, the prepared sample maintained superhydrophobicity after various kinds of destruction (such as sandpaper abrasion, corrosive liquid attack, ultrasonic treatment, UV irradiation, and high-speed drops/turbulent jets impact). Even though the superhydrophobicity can be destroyed by plasma etching, it can be recovered after 12 h at room temperature.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2024
·Vol. 13
·期 3
·1755-1765
·
IF 10.7
Wanxiong Yong,Weining Liu,Xiaoying Xin,Guodong Fu
In recent years, smart windows have increasingly focused on adjusting optical transmissive properties and providing efficient solutions for energy-saving buildings and vehicles. Electrochromic smart windows are considered a viable option for green buildings. However, conventional electrochromic devices require external voltage for operation, resulting in additional energy consumption. Furthermore, they cannot achieve zero transmission across the entire visible spectrum in the colored state, failing to provide high privacy protection. In this study, we present a self-powered electrochromic and thermochromic dual-responsive smart window that functions as a self-rechargeable battery and can achieve a highly private state across the entire visible range. We utilized the thermally stimulated phase transition behavior of hydroxypropyl methylcellulose to develop a thermochromic hydrogel for use in the electrolyte of electrochromic devices without compromising their electrochromic performance. This approach can be universally applied to electrochromic devices, and the phase transition temperature can be easily adjusted by varying the cationic species. In addition to its ion-conductive function, the electrolyte also exhibits thermochromic properties, enabling electrochromic devices to achieve four distinct states: a highly transparent (bleached) state, a milky white state (thermochromic), a blue state (electrochromic), and a fully nontransparent state (the dual-color private state). Notably, the electrochromic state can self-recover, regaining its transparent appearance simply by disconnecting the Zn and ITO electrodes. This recovery occurs due to the spontaneous oxidation of W5+ to W6+ facilitated by dissolved oxygen in the electrolyte. Consequently, the device we present is bifunctional, serving both as a self-powered electrochromic window and a thermochromic window. This innovative chromatic engineering significantly expands the industrial market for electrochromic smart window applications, catering to both public and private contexts, and offers enhanced flexibility in the design of building façades, paving the way for further industrial applications.
研究领域:
材料科学
·
能源工程
·
光学工程
✓ 已验证
DOI
高影响因子
Soft Matter
·
2016
·Vol. 12
·期 25
·5572-5580
·
IF 3.798
Jingfang Li,Jing Xu,Xiaodong Li,Wenmei Gao,Liyan Wang,Lixin Wu,Myongsoo Lee,Wen Li
A series of cationic peptides with alternating lysines and hydrophobic residues were designed and synthesized. These kinds of short peptides with protonated lysines can complex with anionic heteropoly acids (HPAs) to form a stable gel in water/ethanol mixed solution. Circular dichroism spectroscopy showed that the short peptides adopted a mixed conformation (β-sheet and random-coil) within the gel matrix. Scanning and transmission electron microscopy revealed that the heteropoly acids, acting as nanosized cross-linkers, first initiated the self-assembly of the cationic peptides into spherical nanostructures. Then these nanospheres accumulated with each other through hydrogen bonds and hydrophobic interactions to form large sheet-like assemblies, which further interconnected with each other forming continuous 3D network structures. Fourier-transform infrared spectroscopy showed that the structural integrity of the HPAs was maintained during the gelation process. The resultant hybrid gels showed reversible photo- and elecrtro-chromic properties. X-ray photoelectron spectroscopy revealed that the hybrid gels, capable of persistent and reversible changes of their colour, are attributed to the intervalence charge-transfer transition of the HPAs. Reversible information writing and erasing were demonstrated through a repeated photo-lithograph or electric stimuli without significant loss of the gel performance.
研究领域:
生物化学
·
材料科学
·
纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2016
·Vol. 6
·期 38
·32176-32182
·
IF 3.289
Fan Yang,Xingfeng Shi,Zhang Chen,Dongyun Ma,Yupeng Wu,Hongjie Luo,Yanfeng Gao
Thermochromic (TC) and electrochromic (EC) smart windows are the mostly studied categories of smart window, but they usually work in different wavebands, and each have their own advantages. This work offers a method to combine the advantages of TC and EC smart windows by synthesizing TC–EC dual-response TiO2–VO2 nanocomposite films. These films were prepared by dispersing VO2 nanoparticles (NPs) in TiO2 sols and then underwent annealing. The optimized film showed a luminous transmittance (Tlum) of 66.1% at 20 °C, 59.3% at 90 °C and a ΔTsol of 11.2%. By applying a voltage of −5 V, the film showed an EC transmittance modulation (ΔT) of 19.1% at 630 nm, a combined performance of Tlum = 44.7% and ΔTsol = 17.1% (increased by 52%). The color of the films could also be modified from a yellowish brown to a light blue, which is meaningful for practical usage. The current TiO2–VO2 nanocomposite film combines TC and EC performance, which may be an important breakthrough in energy saving smart windows.
研究领域:
材料科学
·
能源技术
✓ 已验证
DOI
高影响因子
Materials
·
2024
·Vol. 17
·期 22
·5628
·
IF 3.1
Xiaomin Zhang,Xiangrui Gao,Yue Yuan,Guangqin Yang,Yanchen Li
Fly ash (FA) is the main solid waste emitted from coal-fired power plants. Due to its high yield, low utilization rate, and occupation of a large amount of land, it exerts enormous pressure on the Earth’s environment. With the deepening of the concept of sustainable development, exploring the reuse of industrial waste such as FA has become a key strategy. If FA can be combined with commonly used jewelry in people’s lives, it will be of great significance to promote the high-net-worth utilization of FA. Therefore, this study synthesized a fly-ash-based composite material with color-changing function and combined it with necklaces as the main material. In the first stage, after blending fly ash and slag, an alkaline activator with a total mass of 10% was added. When the proportion of fly ash was 60%, the compressive strength of the prepared fly-ash-based composite material reached 10.1 MPa. This was attributed to the reaction between sodium silicate in the alkaline activator and free CaO, MgO, and other substances in the fly ash to form hydrated silicate colloids, which solidify the fly ash and transform it into a complex three-dimensional network skeleton. In the second stage, a UV resistant coating with thermochromic function was obtained by blending acrylic resin, TiO2, and a thermosensitive color-changing agent. It was applied to the surface of fly-ash-based composite materials, and the results showed that as the content of the color-changing agent increased, the number of pores on the surface of the coating gradually decreased. When the content of color-changing agent was 10%, the prepared 10%FAB not only had good surface color but also had good thermal stability, UV absorption ability, superhydrophobicity, and mechanical properties. Therefore, 10%FAB was selected as the basic material for jewelry design. In the third stage, the traditional Chinese technique of “gold inlaid with jade” was utilized to develop jewelry applications for the FA composites. As such, 10%FAB was processed into necklaces, which not only had modern design aesthetics but also had good color-changing effects above 30 °C. And after a long period of UV aging experiments, the necklace did not show any wrinkles, bubbles, or other phenomena. Due to the excitation of TiO2hole–electron pairs, the necklace’s UV absorption ability was further improved. This study demonstrates the potential application of industrial waste in decorative products, expands the high-end utilization of fly ash as a low-cost material, and provides new ideas for building a low-carbon lifestyle.
研究领域:
材料科学
·
环境科学
·
艺术设计
✓ 已验证
产品关联
DOI
PubMed
高影响因子
POLYMER
·
2017
·
IF 3.684
Ying Yan,Ningwei Sun,Xiaoteng Jia,Xincai Liu,Ce Wang,Danming Chao
Electroactive materials have gained increasing attention for their intelligent applications. In this work, we report the design and synthesis of a novel electrochromic and electrofluorochromic dual-switching polyurea bearing oligoaniline and fluorescent triphenylamine units (PUOT). Cyclic voltammogram of PUOT exhibits two reversible redox couples at 0.96 V/0.73 V and 1.36 V/1.11 V (vs. Ag/AgCl reference electrode), ascribed to the redox transformation of oligoaniline and triphenylamine groups, respectively. In this wide potential window (0–1.6 V), the PUOT film reveals a unique multistage regulated electrochromic behavior with maximal transmittance contrast value of 38% switching from 0.0 V to 1.0 V, and partial transmittance contrast value of 14% (0–1.6 V) and 24% (1.0–1.6 V). Furthermore, its electrofluorochromic behavior has also been disclosed at the potential range of 0–1.0 V, which demonstrates that the oligoaniline groups should be served as electroactive units in this electrofluorochromic system. Our research not only presents a deep understanding of the optical-electrical modulation mechanism but also paves the way for their future applications.
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of the American Chemical Society
·
2015
·
IF 12.113
Zhennan Wu,Jiale Liu,Yang Gao,Huiwen Liu,Tingting Li,Haoyang Zou,Zhigang Wang,Kai Zhang,Yue Wang,Hao Zhang,Bai Yang
Metal nanoclusters (NCs) as a new class of phosphors have attracted a great deal of interest owing to their unique electronic structure and subsequently molecule-like optical properties. However, limited successes have been achieved in producing the NCs with excellent luminescent performance. In this paper, we demonstrate the significant luminescence intensity enhancement of 1-dodecanethiol (DT)-capped Cu NCs via self-assembly strategy. By forming compact and ordered assemblies, the original nonluminescent Cu NCs exhibit strong emission. The flexibility of self-assembly allows to further control the polymorphism of Cu NCs assemblies, and hence the emission properties. Comparative structural and optical analysis of the polymorphic NCs assemblies permits to establish a relationship between the compactness of assemblies and the emission. First, high compactness reinforces the cuprophilic Cu(I)···Cu(I) interaction of inter- and intra-NCs, and meanwhile, suppresses intramolecular vibration and rotation of the capping ligand of DT, thus enhancing the emission intensity of Cu NCs. Second, as to the emission energy that depends on the distance of Cu(I)···Cu(I), the improved compactness increases average Cu(I)···Cu(I) distance by inducing additional inter-NCs cuprophilic interaction, and therewith leads to the blue shift of NCs emission. Attributing to the assembly mediated structural polymorphism, the NCs assemblies exhibit distinct mechanochromic and thermochromic luminescent properties. Metal NCs-based white light-emitting diodes are further fabricated by employing the NCs assemblies with blue-green, yellow, and red emissions as phosphors.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MACROMOLECULAR MATERIALS AND ENGINEERING
·
2022
·Vol. 307
·期 3
·2100778
·
IF 4.402
Xiaofei Wang,Yang He,Jinsong Leng
The combination of shape memory effects and multi-functionalities in smart materials is becoming one of the hottest research directions in the field of actuators and robotics. In this study, N -hydroxyethyl-3,3-dimethyl-6-nitroindoline spiropyran (SP) is chemically grafted into a polyurethane matrix to prepare ultraviolet light-actuated shape memory thermoplastic polyurethane, which first integrates three unique properties including shape memory, photochromism, and mechanochromism. The FTIR, WAXD, SAXS, DSC, TGA, and shape memory tests reveal that the shape memory transformation temperature of 4.6 wt% SP-based shape memory polyurethane is 41.2 °C, and it has the highest shape memory performance, as indicated by shape fixation and shape recovery ratios of 97.4% and 93.7%, respectively. Furthermore, “bionic fingers” with diversely selective actuation properties are fabricated, which exhibit a series of programmable multi-segment motions to meet potential applications in the field of soft actuators.
研究领域:
材料科学
·
智能材料
·
机器人学
✓ 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）