Solar anti-icing/de-icing is an environmentally friendly way to convert light energy into heat with the purpose of melting/removing ice. However, the inherent intermittency of solar irradiation limits the application ...Solar anti-icing/de-icing is an environmentally friendly way to convert light energy into heat with the purpose of melting/removing ice. However, the inherent intermittency of solar irradiation limits the application of solar-thermal energy-conversion technologies, when continuous de-icing is required. Herein, we investigate a solar phase-change material(SPCM) that consists of expanded graphite(EG)/paraffin/polydimethylsiloxane(PDMS), which can not only perform the solar-thermal conversion but also release/store thermal energy. Under sunlight, the SPCM effectively collects and converts the light energy into thermal energy for later antiicing/de-icing. To prepare for a no-light period, e.g., in the evening, the converted thermal energy can be stored in the SPCM using a phase transition. In this way, the energy can be released when needed to keep the temperature of a surface from freezing. The SPCM surface shows excellent anti-icing/de-icing properties such as a long droplet freeze-delay time(td> 2 h), even at an ultra-low temperature(-40℃), using only the light of one sun. This freeze-delay time is much longer than that for a surface without PCM. The tested SPCM surfaces show a high de-icing rate(2.21 kg m^(-2)h^(-1)) under real-life conditions. In addition, the SPCM shows a high de-icing rate and excellent durability. This study provides a promising route for the utilization of solar energy in anti-icing/de-icing applications.展开更多
Development of high-performance solid state luminescent carbon-based nanomaterials remains challenging.Here,strong blue-green fluorescent carbonized polymer dots(CPDs)from o-aminobenzenethiol and thiosalicylic acid(o ...Development of high-performance solid state luminescent carbon-based nanomaterials remains challenging.Here,strong blue-green fluorescent carbonized polymer dots(CPDs)from o-aminobenzenethiol and thiosalicylic acid(o ABT-TSA-CPDs)with an absolute photoluminescence quantum yield(PLQY)of 76%in solid state without matrix were synthesized.Through adjusting the reaction temperature and time,the PL centers were proved to be carbon core state and surface state associated to carbonyl group which was the source of strong fluorescence emission in solid state.The mechanism of the unique phenomenon of enhanced emission from ethanol solution(PLQY=7%)to powder(PLQY=76%)was investigated by analyzing the chemical properties and structures of o ABT-TSA-CPDs at different temperatures and o ABT-TSACPDs/PVC composites,and was confirmed as fixation of PL centers.展开更多
Perovskite nanocrystals(PNCs)/polymer nanocomposites can combine the advantages of each other,but extremely few works can achieve the fabrication of PNCs/polymer nanocomposites by bulk polymerization.We originally ado...Perovskite nanocrystals(PNCs)/polymer nanocomposites can combine the advantages of each other,but extremely few works can achieve the fabrication of PNCs/polymer nanocomposites by bulk polymerization.We originally adopt a two-type ligand strategy to fabricate bulk PNCs/polystyrene(PS)nanocomposites,including a new type of synthetic polymerizable ligand.The CsPbCl_(3)PNCs/PS nanocomposites show extremely high transparency even the doping content up to 5 wt%.The high transparency can be ascribed to the Rayleigh scattering as the PNCs distribute uniformly without obvious aggregation.Based on this behavior,we first exploit the potential of PNCs to serve as scatters inside light guided plate(LGP),whose surface illuminance and uniformity can be improved,and this new kind of LGP is compatible with the advanced liquid crystal display technology.Thanks to the facile composition adjustment of CsPbCl_(x)Br_(3-x)(1≤x≤3)PNCs,the Rayleigh scattering behavior can also be adjusted so as to the performance of LGP.The best-performing 5.0-inch LGP based on CsPbCl_(2.5)Br_(0.5)PNCs/PS nanocomposites shows 20.5 times higher illuminance and 1.8 times higher uniformity in display than the control.The LGP based on PNCs/PS nanocomposite exhibits an enormous potential in commercialization no matter based on itself or combined with the LGP-related technology.展开更多
基金the scientific research project of Baishanzu National Park(2021KFLY08)the Starting Fund for Doctoral Research of Lishui University(6004LMM01Z)the Special Fund for Scientific Research of Postdoctoral Work Station Assessment in Zhejiang,China(2023).
基金partly supported by the scientific research project of Baishanzu National Park(2021KFLY08)the National Natural Science Foundation of China(31970447)+1 种基金the Starting Fund for Doctoral Research of Lishui University(6004LMM01Z)the Special Fund for Scientific Research of Postdoctoral Work Station Assessment in Zhejiang Province,China(2021,2023)。
基金financially supported by the National Natural Science Foundation of China (21875261, 51925307 and 21733010)the National Key Research and Development Program of China (2020YFE0100300 and 2018YFA0208502)+1 种基金the Key Research Program of Frontier Sciences, Chinese Academy of Sciences (ZDBS-LYSLH031)the Youth Innovation Promotion Association of the Chinese Academy of Sciences (2018044)。
文摘Solar anti-icing/de-icing is an environmentally friendly way to convert light energy into heat with the purpose of melting/removing ice. However, the inherent intermittency of solar irradiation limits the application of solar-thermal energy-conversion technologies, when continuous de-icing is required. Herein, we investigate a solar phase-change material(SPCM) that consists of expanded graphite(EG)/paraffin/polydimethylsiloxane(PDMS), which can not only perform the solar-thermal conversion but also release/store thermal energy. Under sunlight, the SPCM effectively collects and converts the light energy into thermal energy for later antiicing/de-icing. To prepare for a no-light period, e.g., in the evening, the converted thermal energy can be stored in the SPCM using a phase transition. In this way, the energy can be released when needed to keep the temperature of a surface from freezing. The SPCM surface shows excellent anti-icing/de-icing properties such as a long droplet freeze-delay time(td> 2 h), even at an ultra-low temperature(-40℃), using only the light of one sun. This freeze-delay time is much longer than that for a surface without PCM. The tested SPCM surfaces show a high de-icing rate(2.21 kg m^(-2)h^(-1)) under real-life conditions. In addition, the SPCM shows a high de-icing rate and excellent durability. This study provides a promising route for the utilization of solar energy in anti-icing/de-icing applications.
基金supported financially by the National Science Foundation of China(Nos.22035001,21774041)Jilin University Science and Technology Innovative Research Team(No.2017TD-06)。
文摘Development of high-performance solid state luminescent carbon-based nanomaterials remains challenging.Here,strong blue-green fluorescent carbonized polymer dots(CPDs)from o-aminobenzenethiol and thiosalicylic acid(o ABT-TSA-CPDs)with an absolute photoluminescence quantum yield(PLQY)of 76%in solid state without matrix were synthesized.Through adjusting the reaction temperature and time,the PL centers were proved to be carbon core state and surface state associated to carbonyl group which was the source of strong fluorescence emission in solid state.The mechanism of the unique phenomenon of enhanced emission from ethanol solution(PLQY=7%)to powder(PLQY=76%)was investigated by analyzing the chemical properties and structures of o ABT-TSA-CPDs at different temperatures and o ABT-TSACPDs/PVC composites,and was confirmed as fixation of PL centers.
基金This work was financially supported by the National Science Foundation of China(NSFC)under Grant No.52233005.
文摘Perovskite nanocrystals(PNCs)/polymer nanocomposites can combine the advantages of each other,but extremely few works can achieve the fabrication of PNCs/polymer nanocomposites by bulk polymerization.We originally adopt a two-type ligand strategy to fabricate bulk PNCs/polystyrene(PS)nanocomposites,including a new type of synthetic polymerizable ligand.The CsPbCl_(3)PNCs/PS nanocomposites show extremely high transparency even the doping content up to 5 wt%.The high transparency can be ascribed to the Rayleigh scattering as the PNCs distribute uniformly without obvious aggregation.Based on this behavior,we first exploit the potential of PNCs to serve as scatters inside light guided plate(LGP),whose surface illuminance and uniformity can be improved,and this new kind of LGP is compatible with the advanced liquid crystal display technology.Thanks to the facile composition adjustment of CsPbCl_(x)Br_(3-x)(1≤x≤3)PNCs,the Rayleigh scattering behavior can also be adjusted so as to the performance of LGP.The best-performing 5.0-inch LGP based on CsPbCl_(2.5)Br_(0.5)PNCs/PS nanocomposites shows 20.5 times higher illuminance and 1.8 times higher uniformity in display than the control.The LGP based on PNCs/PS nanocomposite exhibits an enormous potential in commercialization no matter based on itself or combined with the LGP-related technology.
