The Experts below are selected from a list of 13092 Experts worldwide ranked by ideXlab platform
Tianyu Yuan - One of the best experts on this subject based on the ideXlab platform.
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tunable thermochromism of multifunctional charge transfer based supramolecular materials assembled in water
Chemistry of Materials, 2017Co-Authors: Tianyu Yuan, Congzhi Zhu, Zhiyuan Jiang, Hungjue Sue, Lei Fang, Mark A OlsonAbstract:Stimuli-responsive materials, such as Thermochromics, have found mass usage and profitability in manufacturing and process control. Imparting charge-transfer-based functional supramolecular materials with tunable thermochromism emerges as an ideal strategy to construct optically responsive multifunctional assemblies. Herein, the authors report a new series of thermochromic charge-transfer-based supramolecular materials assembled in water. These assemblies are composed of a bis-bipyridinium-derived acceptor and a series of commercially available donors—namely, the neurotransmitter melatonin and its analogue bioisosteres. When the chemical structure of the donors are tailored, the strength of the charge-transfer interactions can be tuned. Thermochromic aerogels and inks of these materials are prepared, with a large selection of colors, in environment-friendly solvents and demonstrate tunable thermochromic transition temperatures ranging from 45 to 105 °C. Favorable compatibility of these materials with comm...
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Tunable Thermochromism of Multifunctional Charge-Transfer-Based Supramolecular Materials Assembled in Water
2017Co-Authors: Tianyu Yuan, Congzhi Zhu, Zhiyuan Jiang, Hungjue Sue, Lei Fang, Mark A OlsonAbstract:Stimuli-responsive materials, such as Thermochromics, have found mass usage and profitability in manufacturing and process control. Imparting charge-transfer-based functional supramolecular materials with tunable thermochromism emerges as an ideal strategy to construct optically responsive multifunctional assemblies. Herein, the authors report a new series of thermochromic charge-transfer-based supramolecular materials assembled in water. These assemblies are composed of a bis-bipyridinium-derived acceptor and a series of commercially available donorsnamely, the neurotransmitter melatonin and its analogue bioisosteres. When the chemical structure of the donors are tailored, the strength of the charge-transfer interactions can be tuned. Thermochromic aerogels and inks of these materials are prepared, with a large selection of colors, in environment-friendly solvents and demonstrate tunable thermochromic transition temperatures ranging from 45 to 105 °C. Favorable compatibility of these materials with commercial inks and inkjet printers afford excellent pattern quality with extended color options. Mechanistic studies reveal that the two types of water molecules were bound to the supramolecular complexes with differing strengths, and that the more weakly bound water is responsible for the thermochromic transitions
Mark A Olson - One of the best experts on this subject based on the ideXlab platform.
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tunable thermochromism of multifunctional charge transfer based supramolecular materials assembled in water
Chemistry of Materials, 2017Co-Authors: Tianyu Yuan, Congzhi Zhu, Zhiyuan Jiang, Hungjue Sue, Lei Fang, Mark A OlsonAbstract:Stimuli-responsive materials, such as Thermochromics, have found mass usage and profitability in manufacturing and process control. Imparting charge-transfer-based functional supramolecular materials with tunable thermochromism emerges as an ideal strategy to construct optically responsive multifunctional assemblies. Herein, the authors report a new series of thermochromic charge-transfer-based supramolecular materials assembled in water. These assemblies are composed of a bis-bipyridinium-derived acceptor and a series of commercially available donors—namely, the neurotransmitter melatonin and its analogue bioisosteres. When the chemical structure of the donors are tailored, the strength of the charge-transfer interactions can be tuned. Thermochromic aerogels and inks of these materials are prepared, with a large selection of colors, in environment-friendly solvents and demonstrate tunable thermochromic transition temperatures ranging from 45 to 105 °C. Favorable compatibility of these materials with comm...
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Tunable Thermochromism of Multifunctional Charge-Transfer-Based Supramolecular Materials Assembled in Water
2017Co-Authors: Tianyu Yuan, Congzhi Zhu, Zhiyuan Jiang, Hungjue Sue, Lei Fang, Mark A OlsonAbstract:Stimuli-responsive materials, such as Thermochromics, have found mass usage and profitability in manufacturing and process control. Imparting charge-transfer-based functional supramolecular materials with tunable thermochromism emerges as an ideal strategy to construct optically responsive multifunctional assemblies. Herein, the authors report a new series of thermochromic charge-transfer-based supramolecular materials assembled in water. These assemblies are composed of a bis-bipyridinium-derived acceptor and a series of commercially available donorsnamely, the neurotransmitter melatonin and its analogue bioisosteres. When the chemical structure of the donors are tailored, the strength of the charge-transfer interactions can be tuned. Thermochromic aerogels and inks of these materials are prepared, with a large selection of colors, in environment-friendly solvents and demonstrate tunable thermochromic transition temperatures ranging from 45 to 105 °C. Favorable compatibility of these materials with commercial inks and inkjet printers afford excellent pattern quality with extended color options. Mechanistic studies reveal that the two types of water molecules were bound to the supramolecular complexes with differing strengths, and that the more weakly bound water is responsible for the thermochromic transitions
Henglong Zhang - One of the best experts on this subject based on the ideXlab platform.
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improvement of thermal and optical responses of short term aged thermochromic asphalt binder by warm mix asphalt technology
Journal of Cleaner Production, 2021Co-Authors: Zihao Chen, Henglong Zhang, Haihui Duan, Caijun ShiAbstract:Abstract Thermochromic asphalt materials, due to their dynamically reversible thermal and optical responses in accordance with ambient temperature, have the significant potential in prolonging the lifespan of pavement and improving the urban climatic environment. However, the traditional hot-mix asphalt mixture preparation method with high-temperature conditions can cause damage to durability of thermochromic microcapsules contained in asphalt matrix and hence compromise the temperature regulation functionality of thermochromic asphalt materials. Therefore, the effects of reduced aging temperature by warm-mix asphalt (WMA) technology on properties of short-term aged thermochromic asphalt binder were investigated in this research in terms of rheological property, fluorescent morphology, chemical structure, optical reflectance and temperature regulation effectiveness. In addition, environmental impacts of thermochromic asphalt mixture with warm-mix technology were also discussed. The results indicate that the mixing and compaction temperatures of thermochromic asphalt mixture can be reduced by 16 °C due to WMA technology. The reduced aging temperature by Sasobit can more efficiently maintain the morphology integrity of thermochromic microcapsules, mitigate the outflow of functional core materials and thus improve the optical reflectance of short-term aged thermochromic asphalt binder. When exposed to outdoor solar radiation in hot summer, the asphalt mixture prepared by thermochromic asphalt can achieve a 3 °C decrease in pavement temperature compared with pure asphalt mixture. In addition, the thermochromic asphalt mixture prepared by WMA technology can further reduce the pavement temperature by 2 °C when compared with traditional hot-mix thermochromic asphalt mixture. The reduced pavement surface temperature in hot summer can significantly reduce the amount of convection and irradiation heat from pavement to urban atmosphere, which is of great significance to the improvement of urban microclimate and the sustainable development of city.
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Performance of thermochromic asphalt
Eco-efficient Materials for Reducing Cooling Needs in Buildings and Construction, 2021Co-Authors: Henglong Zhang, Zihao Chen, Shuai Zhang, Chongzheng ZhuAbstract:Abstract Asphalt pavements are commonly applied to highways due to their low construction cost and rheological and mechanical properties (i.e., ductility, self-healing, and load capacity). However, the black color causes absorption of solar radiation, which creates high pavement temperatures, contributing to thermal oxidation and photooxidation. Asphalt binder is susceptible to temperature, becoming soft when heated and stiff when cooled, leading to rutting in summer and cracking in winter. Thermochromic materials can reversibly change their solar reflectance in accordance with temperature. They can be designed to have high solar reflectance at high temperature and low solar reflectance at low temperature, enabling them to be applied to adjust the temperature of asphalt pavement. Additionally, studies have proven that thermochromic powders can reduce the rutting and low-temperature cracking in asphalt pavements and provide an antiaging property in asphalt binders. This chapter first introduces three-component organic reversible thermochromic microcapsules, including their classification, merits, components, microstructure, thermochromic mechanism, and thermal and optical properties. Then, the performance of thermochromic asphalt binders is illustrated as related to optical, thermal, rheological, and antiaging properties, including the adjustment of thermochromic asphalt temperature. Finally, some proposals on future research on thermochromic asphalt are discussed.
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Effect of Aging on the Rheological Behaviors of SBS-Modified Asphalt with Thermochromic Materials
Journal of Testing and Evaluation, 2020Co-Authors: Henglong Zhang, Zihao ChenAbstract:The influences of different types (red, black, and blue) and dosages (2 % and 4 %) of thermochromic materials on rheological and aging resistance of styrene-butadiene-styrene copolymer (SBS)–modified asphalt (SBSMA) were studied. Rheological properties at high and low temperatures for thermochromic asphalt binder (TAB) were characterized by a dynamic shear rheometer and bending beam rheometer. The complex modulus of SBSMA decreased after the thermochromic powder was added, which indicated that thermochromic materials deteriorated the high-temperature rutting resistance of SBSMA, and the dosage of 2 % blue thermochromic powder had the least influence on the high-temperature performance of SBSMA. Instead, adding powders into SBSMA greatly improved the low-temperature deformation and relaxation capacity of SBSMA. Among all of the samples, the binder added with 2 % blue thermochromic powder showed the widest performance grade range. Rheological aging indexes were utilized to evaluate the antiaging performances of SBSMA. Compared with those of SBSMA, the rheological aging indexes of TAB were much smaller, which presented that thermochromic materials are able to strength the antiaging performances of SBSMA. In general, the binder added with 2 % red thermochromic powder showed the best aging resistances against thermal and photooxidation aging simultaneously, followed by the binder added with 4 % red thermochromic powder.
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an innovative and smart road construction material thermochromic asphalt binder
2020Co-Authors: Henglong Zhang, Zihao ChenAbstract:Abstract Asphalt concrete is a mixture mainly composed of mineral aggregates, asphalt binder, and additive, and has been widely applied in pavement construction. As an adhesive material, asphalt binder is considered to have predominant effects and contributions on whole asphalt pavement performance. However, being susceptible to temperature, asphalt binder is prone to be soft at high temperature while being stiff at low temperature, which may result in rutting and cracking distresses of pavement, respectively. Unfortunately, the inherent nature of the black exterior of asphalt makes pavement control absorb a great deal of heat from solar radiation in summer, which not only induces the high-temperature pavement distress mentioned above but also aggressively accelerates the thermal and photo oxidation aging severity of asphalt. In addition, the high surface temperature of pavement will further exacerbate urban heat island effects, which results in a series of adverse environmental issues. Thermochromic materials are substances that can reversibly change their colors in accordance with temperature so that they can dynamically adjust their reflectivity to solar radiation. Every thermochromic material has its own fixed transition temperature below which thermochromic materials are colored substances with lower reflectivity to solar radiation, while above this temperature they become colorless and exhibit higher solar energy reflection. Thermochromic materials have been widely used in building materials, such as building coatings and cement, because of the advantage of transformation of optical and thermal properties in such a dynamic way. These features possessed by thermochromic materials can make up for the disadvantages shown by conventional asphalt binder. Therefore, thermochromic asphalt binders have also been investigated by many researchers as an innovative and smart road construction material. This chapter first introduces thermochromic materials used in road construction concerning their components, structures, thermochromic mechanism, and thermal and optical properties. Then, the effects of thermochromic asphalt binders on keeping the surface temperature of pavement within a relatively reasonable range are evaluated. Furthermore, the physical, rheological, and antiaging properties of thermochromic asphalt binders are illustrated in detail. Finally, recommendations for future work in the research and application of thermochromic asphalt binders are envisaged and proposed.
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physical rheological and chemical characterization of aging behaviors of thermochromic asphalt binder
Fuel, 2018Co-Authors: Henglong Zhang, Zihao Chen, Guoqing XuAbstract:Abstract As an innovative road material, thermochromic asphalt binder has great effect on keeping the surface temperature of pavement within relatively reasonable range. The objective of this paper was to investigate the anti-aging properties of asphalts containing 0, 2, 4, 6, 8% content of black thermochromic powders (named as blank sample, 2, 4, 6, 8% BTP binder for convenience). Three aging methods, including thin film oven test, pressure aging vessel test and ultraviolet radiation, were applied to simulate thermal and photo oxidation aging of asphalt, respectively. Physical and rheological properties of binders with and without thermochromic powders were measured before and after three aging methods. The results show that the introduction of black thermochromic powders could improve thermal stability and low-temperature cracking performance of asphalt binder. After three aging methods, all of thermochromic asphalt binders exhibit better aging resistance than blank sample by physical, rheological aging indices, and 4% is the optimal content in which thermochromic asphalt binder synthetically exhibits the best aging resistance. In addition, based on grey relational analysis (GRA), the aging indices of complex modulus aging index (CAI) and viscosity aging index (VAI) are more reliable in aging evaluation.
Zihao Chen - One of the best experts on this subject based on the ideXlab platform.
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improvement of thermal and optical responses of short term aged thermochromic asphalt binder by warm mix asphalt technology
Journal of Cleaner Production, 2021Co-Authors: Zihao Chen, Henglong Zhang, Haihui Duan, Caijun ShiAbstract:Abstract Thermochromic asphalt materials, due to their dynamically reversible thermal and optical responses in accordance with ambient temperature, have the significant potential in prolonging the lifespan of pavement and improving the urban climatic environment. However, the traditional hot-mix asphalt mixture preparation method with high-temperature conditions can cause damage to durability of thermochromic microcapsules contained in asphalt matrix and hence compromise the temperature regulation functionality of thermochromic asphalt materials. Therefore, the effects of reduced aging temperature by warm-mix asphalt (WMA) technology on properties of short-term aged thermochromic asphalt binder were investigated in this research in terms of rheological property, fluorescent morphology, chemical structure, optical reflectance and temperature regulation effectiveness. In addition, environmental impacts of thermochromic asphalt mixture with warm-mix technology were also discussed. The results indicate that the mixing and compaction temperatures of thermochromic asphalt mixture can be reduced by 16 °C due to WMA technology. The reduced aging temperature by Sasobit can more efficiently maintain the morphology integrity of thermochromic microcapsules, mitigate the outflow of functional core materials and thus improve the optical reflectance of short-term aged thermochromic asphalt binder. When exposed to outdoor solar radiation in hot summer, the asphalt mixture prepared by thermochromic asphalt can achieve a 3 °C decrease in pavement temperature compared with pure asphalt mixture. In addition, the thermochromic asphalt mixture prepared by WMA technology can further reduce the pavement temperature by 2 °C when compared with traditional hot-mix thermochromic asphalt mixture. The reduced pavement surface temperature in hot summer can significantly reduce the amount of convection and irradiation heat from pavement to urban atmosphere, which is of great significance to the improvement of urban microclimate and the sustainable development of city.
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Performance of thermochromic asphalt
Eco-efficient Materials for Reducing Cooling Needs in Buildings and Construction, 2021Co-Authors: Henglong Zhang, Zihao Chen, Shuai Zhang, Chongzheng ZhuAbstract:Abstract Asphalt pavements are commonly applied to highways due to their low construction cost and rheological and mechanical properties (i.e., ductility, self-healing, and load capacity). However, the black color causes absorption of solar radiation, which creates high pavement temperatures, contributing to thermal oxidation and photooxidation. Asphalt binder is susceptible to temperature, becoming soft when heated and stiff when cooled, leading to rutting in summer and cracking in winter. Thermochromic materials can reversibly change their solar reflectance in accordance with temperature. They can be designed to have high solar reflectance at high temperature and low solar reflectance at low temperature, enabling them to be applied to adjust the temperature of asphalt pavement. Additionally, studies have proven that thermochromic powders can reduce the rutting and low-temperature cracking in asphalt pavements and provide an antiaging property in asphalt binders. This chapter first introduces three-component organic reversible thermochromic microcapsules, including their classification, merits, components, microstructure, thermochromic mechanism, and thermal and optical properties. Then, the performance of thermochromic asphalt binders is illustrated as related to optical, thermal, rheological, and antiaging properties, including the adjustment of thermochromic asphalt temperature. Finally, some proposals on future research on thermochromic asphalt are discussed.
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Effect of Aging on the Rheological Behaviors of SBS-Modified Asphalt with Thermochromic Materials
Journal of Testing and Evaluation, 2020Co-Authors: Henglong Zhang, Zihao ChenAbstract:The influences of different types (red, black, and blue) and dosages (2 % and 4 %) of thermochromic materials on rheological and aging resistance of styrene-butadiene-styrene copolymer (SBS)–modified asphalt (SBSMA) were studied. Rheological properties at high and low temperatures for thermochromic asphalt binder (TAB) were characterized by a dynamic shear rheometer and bending beam rheometer. The complex modulus of SBSMA decreased after the thermochromic powder was added, which indicated that thermochromic materials deteriorated the high-temperature rutting resistance of SBSMA, and the dosage of 2 % blue thermochromic powder had the least influence on the high-temperature performance of SBSMA. Instead, adding powders into SBSMA greatly improved the low-temperature deformation and relaxation capacity of SBSMA. Among all of the samples, the binder added with 2 % blue thermochromic powder showed the widest performance grade range. Rheological aging indexes were utilized to evaluate the antiaging performances of SBSMA. Compared with those of SBSMA, the rheological aging indexes of TAB were much smaller, which presented that thermochromic materials are able to strength the antiaging performances of SBSMA. In general, the binder added with 2 % red thermochromic powder showed the best aging resistances against thermal and photooxidation aging simultaneously, followed by the binder added with 4 % red thermochromic powder.
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an innovative and smart road construction material thermochromic asphalt binder
2020Co-Authors: Henglong Zhang, Zihao ChenAbstract:Abstract Asphalt concrete is a mixture mainly composed of mineral aggregates, asphalt binder, and additive, and has been widely applied in pavement construction. As an adhesive material, asphalt binder is considered to have predominant effects and contributions on whole asphalt pavement performance. However, being susceptible to temperature, asphalt binder is prone to be soft at high temperature while being stiff at low temperature, which may result in rutting and cracking distresses of pavement, respectively. Unfortunately, the inherent nature of the black exterior of asphalt makes pavement control absorb a great deal of heat from solar radiation in summer, which not only induces the high-temperature pavement distress mentioned above but also aggressively accelerates the thermal and photo oxidation aging severity of asphalt. In addition, the high surface temperature of pavement will further exacerbate urban heat island effects, which results in a series of adverse environmental issues. Thermochromic materials are substances that can reversibly change their colors in accordance with temperature so that they can dynamically adjust their reflectivity to solar radiation. Every thermochromic material has its own fixed transition temperature below which thermochromic materials are colored substances with lower reflectivity to solar radiation, while above this temperature they become colorless and exhibit higher solar energy reflection. Thermochromic materials have been widely used in building materials, such as building coatings and cement, because of the advantage of transformation of optical and thermal properties in such a dynamic way. These features possessed by thermochromic materials can make up for the disadvantages shown by conventional asphalt binder. Therefore, thermochromic asphalt binders have also been investigated by many researchers as an innovative and smart road construction material. This chapter first introduces thermochromic materials used in road construction concerning their components, structures, thermochromic mechanism, and thermal and optical properties. Then, the effects of thermochromic asphalt binders on keeping the surface temperature of pavement within a relatively reasonable range are evaluated. Furthermore, the physical, rheological, and antiaging properties of thermochromic asphalt binders are illustrated in detail. Finally, recommendations for future work in the research and application of thermochromic asphalt binders are envisaged and proposed.
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physical rheological and chemical characterization of aging behaviors of thermochromic asphalt binder
Fuel, 2018Co-Authors: Henglong Zhang, Zihao Chen, Guoqing XuAbstract:Abstract As an innovative road material, thermochromic asphalt binder has great effect on keeping the surface temperature of pavement within relatively reasonable range. The objective of this paper was to investigate the anti-aging properties of asphalts containing 0, 2, 4, 6, 8% content of black thermochromic powders (named as blank sample, 2, 4, 6, 8% BTP binder for convenience). Three aging methods, including thin film oven test, pressure aging vessel test and ultraviolet radiation, were applied to simulate thermal and photo oxidation aging of asphalt, respectively. Physical and rheological properties of binders with and without thermochromic powders were measured before and after three aging methods. The results show that the introduction of black thermochromic powders could improve thermal stability and low-temperature cracking performance of asphalt binder. After three aging methods, all of thermochromic asphalt binders exhibit better aging resistance than blank sample by physical, rheological aging indices, and 4% is the optimal content in which thermochromic asphalt binder synthetically exhibits the best aging resistance. In addition, based on grey relational analysis (GRA), the aging indices of complex modulus aging index (CAI) and viscosity aging index (VAI) are more reliable in aging evaluation.
Jianying Hu - One of the best experts on this subject based on the ideXlab platform.
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Adaptive thermochromic roof system: Assessment of performance under different climates
Energy and Buildings, 2019Co-Authors: Jianying Hu, Xiong Bill YuAbstract:Abstract Thermochromic materials possess the ability to reversibly change the optical properties in response to the environmental temperature. They have the potential to reduce the energy demand in building operations by modulating the heat transport through the building envelope, i.e., limiting undesired solar heat gain during the hot seasons and increasing solar heat gain during the cold seasons. This is an advantage over conventional cool roof technology. This study aims to evaluating the performance of adaptive thermochromic roof designed by covering regular building roof with thermochromic (TC) coating. TC coating is prepared by incorporating thermochromic pigment and TiO 2 nanoparticle is added to enhance its effectiveness. Optical characterization shows the temperature-dependent solar reflectance of 18–26% for TC coating and 35–59% for TC/TiO 2 coating. EnergyPlus analyses is performed to evaluate impact of thermochromic roof on energy performance of the buildings in seven U.S. geographic locations. The simulation results show that compared to common roof (asphalt shingle), thermochromic roof is effective in reducing the building HVAC load demand, which saves up to 40.9% of total energy consumption, 47.7% of energy cost, and 46.7% of energy associated CO 2 emissions for the buildings in San Fran., CA. In comparison with conventional cool roof, thermochromic roof demonstrates benefits in reducing the overall energy use of the buildings, which reduces up to 7.7% of total energy consumption, 3.6% of energy cost, and 28.5% of energy associated CO 2 emissions. The effectiveness of thermochromic roof depends upon the geographic regions. This work demonstrates that performance of thermochromic roof systems to improve energy efficiency of buildings across different climatic zones.
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Measurement of Wavelength and Temperature-Dependent Optical Properties of Thermochromic Pigments.
Applied Spectroscopy, 2017Co-Authors: Jianying Hu, Xiong Bill YuAbstract:Thermochromic material is a substance that is capable of changing reversibly the color as the temperature rises. Therefore, the optical spectrum of thermochromic material is responsive to the envir...
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Reflectance Spectra of Thermochromic Asphalt Binder: Characterization and Optical Mixing Model
Journal of Materials in Civil Engineering, 2016Co-Authors: Jianying Hu, Xiong YuAbstract:AbstractAsphalt pavement constructed with traditional asphalt binder, which features high solar absorbance, is characterized by high surface temperatures during summer. This causes undesirable performance degradation (i.e., due to accelerated rutting, bleeding, etc.) and environmental consequences (i.e., urban heat island effects and volatile gas emission). Thermochromic asphalt binder, which is asphalt binder mixed with thermochromic materials, has been developed by the authors to dynamically control the solar reflectance and modulate the surface temperature of asphalt pavement. The goal is to improve its long-term durability and environmental friendliness. Thermochromic materials are substances that can reversibly change their colors in response to temperature. The binary thermochromic asphalt binder mixture is produced by incorporating thermochromic powders into a conventional asphalt binder. Measurements of spectral reflectance of thermochromic powders indicate that thermochromic materials feature hig...
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Innovative thermochromic asphalt coating: characterisation and thermal performance
Road Materials and Pavement Design, 2015Co-Authors: Jianying Hu, Xiong YuAbstract:Conventional asphalt strongly absorbs the energy from sunlight due to its black colour. The induced high surface temperature on asphalt pavement during summer and fast temperature drop during winter accelerate the rutting and cracking, impairing its long-term durability. Thermochromic materials, substances that can reversibly change their colours in response to temperature, are characterised as high solar reflectance above certain threshold temperature and high absorbance below the threshold temperature. In this paper, innovative thermochromic coatings are designed to modulate the surface temperature of asphalt pavement and potentially improve its durability and safety. The thermal, optical, and chemical properties of the coatings with thermochromic materials were characterised using modulated differential scanning calorimetry, thermogravimetric analysis, UV–Vis–IR spectrophotometry, and Fourier transform infrared spectroscopy, respectively. Besides, production conditions of thermochromic asphalt coatings...
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Experimental Study of Sustainable Asphalt Binder
Transportation Research Record, 2013Co-Authors: Jianying Hu, Xiong YuAbstract:Asphalt pavements are widely used in highways because of their good performance and relatively low construction and maintenance costs. However, the black color of asphalt binder implies that sunlight is not reflected but absorbed; the absorption raises the temperature of the asphalt pavement and impairs its long-term durability. Thermochromic materials can change their colors in response to temperature. These materials reflect solar energy at high temperatures and absorb it at low temperatures. This study investigated the use of thermochromic materials in asphalt binder to develop a thermochromic asphalt binder that would reduce the surface temperature of asphalt pavement during the summer and lead to improved durability. The thermal and phase transition properties of thermochromic materials were characterized by differential scanning calorimetry and modulated differential scanning calorimetry. Comparison measurements showed that the surface temperature of thermochromic asphalt binder was lower than that ...