COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2024
·
IF 4.9
Weimian Zhou,Qun Yang,Sixuan Tao,Siyu Zhou,Jie Zhu,Ruimiao Li,Lihui Xu,Hong Pan,Hongjuan Zhang,Hong Zhao,Jiping Wang
In this study, the polyurethane/thermochromic dye microcapsules composite films with thermosensitive response have been prepared by solution casting technique. The structure and morphology of the thermochromic dye microcapsules and resulting composite films were characterized. Additionally, the mechanical properties and thermal stability were analyzed. Notably, the reversible thermotropic behavior and the phase change energy storage of the composite films for thermal management were investigated. The results revealed that, the thermochromic dye microcapsules exhibited a discoloration between 35 and 38 ℃. The composite film displayed a uniform color with a modulus of elasticity of 10.7±0.2 MPa when it contained 10 % thermochromic dye microcapsules. Moreover, the composite film exhibited excellent color changes upon heating and cooling, even after undergoing 100 cycles. Infrared thermal imaging confirmed the excellent heat retention properties of the composite film. Increasing the microcapsule content within the films can enhance energy storage capacity and thermal insulation. These composite films hold great potential applications in color conversion systems, daily body temperature monitoring, sensors and indoor thermal insulation.
研究领域:
材料科学
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
·
2022
·
IF 6.206
Jiayin Liu,Yunjie Yin,Juanjuan Sun,Weidong Yu,Jialing Tan,Chaoxia Wang
The fatty alcohol phase change material is used as the solvent for three-component thermochromic pigment (the leuco dye-color developer-solvent), which has the dual functions of both thermochromism and thermal energy storage. However, bisphenol A is usually used as the color developer of the three-component thermochromic pigments currently, which has potential safety hazards and is not conducive to market promotion. For most three-component thermochromic pigments, their colors change from colored to colorless. Here, we prepare the biomass-derived thermochromic pigment (TC-LAP) by using l -ascorbate palmitate (LAP) as a color developer, crystalline violet lactone (CVL) as a leuco dye, and tetradecanol (TD) as a solvent. Interestingly, a special reverse thermochromic phenomenon of endothermic color deepening is found. Heating causes the discoloration of TC-LAP from colorless to colored. Thermal energy storage and reverse thermochromic are realized and devoid of safety hazards. The color of TC-LAP thermochromic pigment changes from white to blue with heating, and the CIE 1931 chroma coordinates change from X = 0.21, Y = 0.26 to X = 0.36, Y = 0.36. For the TC-LAP thermochromic pigment, the chromaticity coordinates of blue (X = 0.36, Y = 0.36) correspond to the energy storage of 179.91 J/g and the discoloration temperature of 40 °C. Reverse thermochromism is an exciting discovery for the color diversity of low temperature and controlled three-component thermochromic pigment. Meanwhile, the use of biomass-derived LAP also alleviates the safety hazard of BPA color developer in three-component thermochromic pigment.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
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
DALTON TRANSACTIONS
·
2025
·
IF 3.3
Xuan Yang,Zesen Yu,Hedong Jiang,Huanhuan Guo,Jian Sun,Jiake Li,Hua Zhu,Yanxiang Wang,Pingchun Guo
Metal–organic frameworks (MOFs) are promising candidates for thermochromic materials. In this study, a hydrogen-bonded 3D porous metal–organic framework, Co-BTC (Co3(BTC)2·12H2O, BTC = 1,3,5-benzenetricarboxylate), exhibited a pink color at room temperature, attributed to the d–d transition of Co2+ ions within the framework, and displayed reversible thermochromic behavior due to alterations in the coordination environment of Co2+ ions. Additionally, Co-BTC/PVB thermochromic film was successfully designed and fabricated as a smart window with a monolayer structure. The window exhibited reversible thermochromic behavior comparable to Co-BTC, with visible transmittance modulation of 10.73%, near-infrared transmittance modulation of 25.87%, and solar transmittance modulation of 12.63%. Compared to a pure PVB window, the smart window reduced indoor temperatures by 5.7 °C in field tests, indicating a significant energy-saving effect. This research presents a potential application for the rational design of MOFs in the development of advanced smart windows.
研究领域:
材料科学
·
能源工程
·
建筑技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CRYSTAL GROWTH & DESIGN
·
2025
·
IF 3.4
Jiayi Tian,Peng Liu,Yahao Zhao,Wei Zheng,Gen Li,Changchun Han,Wen Liu,Qing Li,Zhijie Den,Xinguo Ma,Furong Ye,Yizhong Huang
Vanadium dioxide (VO2) is a promising material for smart windows due to its metal–insulator transition that enables dynamic solar transmittance modulation. In this study, VO2 (M) nanoparticles were synthesized using a novel approach involving the self-supported structure of V4C3 MXene derived from V4AlC3. Through selective etching, solvothermal oxidation and annealing, VO2 (M) nanoparticles with enhanced thermochromic properties were produced. The self-supported structure of V4C3 MXene significantly reduced particle agglomeration and improved crystallinity, resulting in VO2 (M) films with a luminous transmittance (Tlum) of up to 58.3% and a solar modulation ability (ΔTsol) of 6.3%. The study also demonstrated that film thickness and hydrogen peroxide concentration critically influence optical and thermochromic performance. This study provides a new approach for the preparation of MXene-based VO2 thermochromic smart window materials and is expected to promote their application in the field of building energy conservation.
研究领域:
材料科学
·
能源与建筑节能
✓ 已验证
产品关联
DOI
高影响因子
INORGANIC CHEMISTRY
·
2022
·
IF 5.436
Huocheng Lv,Laihui Luo,Weiping Li,Peng Du
To ameliorate the inherent thermal quenching behaviors of upconverting materials, a series of Ho3+/Yb3+-codoped Al2Mo3O12 (i.e., Al2Mo3O12:Ho3+/2xYb3+) microparticles were developed. Upon excitation at 980 nm, intense upconversion (i.e., UC) emissions arising from Ho3+ are observed, and their optimal states occur at x = 0.09. Besides, the UC mechanisms of these generated emissions from 5F4/5S2 and 5F5 levels all pertain to a two-photon absorption process. Furthermore, modified thermal quenching performances are realized in the resultant microparticles, in which the intensities of the UC emissions arising from 5F4/5S2 levels decrease as the temperature increases, while that of the UC emission from the 5F5 level increases and then decreases with the increase of temperature. The coexistence of nonradiative transition promoted crossrelaxation, and energy transfer routes can be responsible for the above phenomenon. By studying the diverse UC emission characteristics at high temperatures, we revealed the thermometric properties of Al2Mo3O12:Ho3+/2xYb3+ microparticles, where their sensitivities can be regulated by selecting the spectral mode and dopant contents. According to the intensity ratio of the UC emissions originating from 5F5 → 5I8 to (5F4,5S2) → 5I7 transitions at different temperatures, one obtains that the relative and absolute sensitivities of the developed compounds reach up to 0.464% and 0.1739 K–1, respectively. Additionally, by the analysis of the thermochromic performances of final products, their thermometric characteristics were also investigated. Note that the environmental temperature is able to be facilely read out by distinguishing the emitting color. These results verify that the Al2Mo3O12:Ho3+/2xYb3+ microparticles are promising luminescent materials for multimode visual optical thermometry.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Chuan-Yan Huang,Jun-Feng Feng,Guo-Chen Li,Li-Guo Liao,Shu-Ting Fan,Jia-Xin Wang,Sheng Zhang,Bang-Jing Li
Active heat absorption strategy and passive heat insulation strategy often go their separate way, and each has its own advantages and disadvantages. This study explores a new thermal insulation material design strategy that introduces thermo-sensitive host–guest inclusion complexes as active heat-absorbing components in passive thermal insulation aerogel. According to this strategy, a novel azobenzene-modified chitosan/oligomeric β-cyclodextrin (CSAZO/CD) composite aerogels were prepared by the freeze-drying method. It was found that CSAZO/CD composite aerogels showed tunable porous structure, good mechanical properties and more importantly wonderful thermal insulation properties. Since CSAZO/CD aerogels contained not only porous structure (porosity 91.03%-95.85%), but also Azo-βCD complexes in the matrix as active heat-absorbing components, these materials showed better thermal insulation capability than other aerogels with similar thermal conductivity. And unlike classic porous material-supported phase change materials which suffer the leakage of PCM after multiple thermal cycles, CSAZO/CD composite aerogels show good long-term stability since the Azo-βCD complexes absorb heat by the solid-to-solid transition. Furthermore, CSAZO/CD composite aerogels showed even better thermal insulation behavior under UV irradiation. The unique insulation properties of CSAZO/CD aerogels make them good candidates for thermal insulation materials in many fields, such as ultra-thin thermal insulation in high temperature or UV environment.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Yuxuan Luo,Danyu Zhang,Shujun Xu,Lianjie Li,Liping Chen,Hai Guo
Herein, YNbO 4 (YNO):Bi 3+ ,Ln 3+ (Ln = Dy, Eu) phosphors were manufactured though high-temperature solid-phase reaction. Their structural properties, optical characteristics and energy transfer mechanisms (Bi 3+ →Ln 3+ ) were analyzed in detail, and their potential application in optical thermometry was explored. Under 312 nm excitation, YNO:Bi 3+ ,Ln 3+ phosphors show broad emission from Bi 3+ ions ( 3 P 1 → 1 S 0 ) and sharp peaks from 4f-4f transitions of Ln 3+ ions. YNO:Bi 3+ ,Ln 3+ samples exhibit high sensitivity and superior thermochromic properties in temperature sensing. For YNO:Bi 3+ ,Dy 3+ phosphor, the maximum absolute sensitivity ( S a ) and relative sensitivity ( S r ) reach 14.25 %K −1 (573 K) and 1.48 %K −1 (444 K), respectively. For YNO:Bi 3+ ,Eu 3+ phosphor, the maximum S a and S r reach 38.21 %K −1 (573 K) and 1.58 %K −1 (445 K), respectively. And the chromaticity shift of emission from YNO:Bi 3+ ,Eu 3+ phosphor is 0.38 for temperature from 303 to 573 K. Such results suggest that YNO:Bi 3+ ,Ln 3+ phosphors can be candidate for visual and highly sensitive optical thermometry.
研究领域:
材料科学
·
光学工程
✓ 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
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Yunpeng Huang,Xi Lin,Yidong Peng,Jiancheng Dong,Shili Xiao,Tianxi Liu
The rapid development of wearable electronics has driven demand for flexible, multifunctional fiber-based materials that can enable real-time physiological monitoring and adaptive responses. We report the design and fabrication of a core-sheath structured, dual-responsive fiber sensor featuring a conductive core and a thermochromic sheath via coaxial wet-spinning. The core comprises a conductive styrene-ethylene-butylene-styrene/carbon nanotubes-Ti 3 C 2 T x (SEBS/CNTs-Ti 3 C 2 T x ) composite optimized for strain sensing, while the sheath incorporates thermochromic microcapsules (TMs) within a SEBS matrix for temperature sensitivity. This integrated architecture enables simultaneous and independent detection of mechanical deformation and thermal variation, which demonstrates sharp and reversible color transitions within a 25–40 °C range, offering visual feedback to physiological temperatures. Furthermore, the conductive CNTs-Ti 3 C 2 T x hybrid network within the core facilitates sensitive strain-resistance behavior, with a maximum gauge factor of 214 at 100 % strain and reliable electromechanical performance over 3000 cycles. When applied to joints and vital regions (e.g., wrist, throat, knees), the fibers provide stable and high-fidelity signals during motion, pulse detection, and vocalization. Collectively, the integrated mechanical compliance, thermal responsiveness, and strain-sensing capacity position these fibers as promising candidates for next-generation wearable electronic systems, enabling smart diagnostics, physiological monitoring, and adaptive interfacing.
研究领域:
材料科学
·
纳米技术
·
生物医学工程
·
传感器
·
柔性电子学
·
智能纺织品
✓ 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
PROGRESS IN ORGANIC COATINGS
·
2020
·
IF 4.469
Xiaoqian Ji,Jingyan Liu,Wan Zhang,Wenwen Liu,Chaoxia Wang
Various molecular thermochromic blocked waterborne polyurethanes have been synthesized via incorporating rhodamine B derivative (RhEA). The effect of molecular weight on the thermal properties, rheological behaviors, and thermochromic properties of the thermochromic polyurethanes were tested. The molecular weight of the thermochromic polyurethanes were tailored in the range of 3317–20,377 by choosing polyethylene glycol (PEG200/600/1000) with various molecular weight as soft segments. The results showed that the thermal decomposition temperature of thermochromic polyurethane with the higher molecular weight was higher. The absorbance of thermochromic polyurethanes gradually increased with the increase of induction time. Additionally, the absorbance of PU-PEG200 was lowest because it had least repetition unit. The thermochromic behaviors of polyurethanes were not affected by the molecular weights. The application performances of synthesized thermochromic polyurethanes in textile printing as a functional colorant were also measured. It was found that the actual lines width of PU-PEG200 were less than the theoretical value and the rate of change was negative. This phenomenon was due to the poor water solubility. The K/S of the printed fabrics with polyurethanes gradually raised with the increase of UV induction time. The thermochromic behaviors of fabrics were also not affected by the molecular weights.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）