Anti-reflective (AR) single layer of silica-titania (SiO2-TiO2) coatings were obtained from sols containing pyromellitic dianhydride (PMDA) derivatives and Ti and Si precursors on glass substrate by dip-coating method...Anti-reflective (AR) single layer of silica-titania (SiO2-TiO2) coatings were obtained from sols containing pyromellitic dianhydride (PMDA) derivatives and Ti and Si precursors on glass substrate by dip-coating method. The coatings showed very high optical quality and the transmission was improved to up to 98.5%. Furthermore, the coatings also presented good mechanical stability.展开更多
Perovskite solar cells have shown great potential in the field of underwater solar cells due to their excellent optoelectronic properties;however,their underwater performance and stability still hinder their practical...Perovskite solar cells have shown great potential in the field of underwater solar cells due to their excellent optoelectronic properties;however,their underwater performance and stability still hinder their practical use.In this research,a 1H,1H,2H,2H-heptadecafluorodecyl acrylate(HFDA)anti-reflection coating(ARC)was introduced as a high-transparent material for encapsulating perovskite solar modules(PSMs).Optical characterization results revealed that HFDA can effectively reduce reflection of light below 800 nm,aiding in the absorption of light within this wavelength range by underwater solar cells.Thus,a remarkable efficiency of 14.65%was achieved even at a water depth of 50 cm.And,the concentration of Pb^(2+)for HFDA-encapsulated film is significantly reduced from 186 to 16.5 ppb after being immersed in water for 347 h.Interestingly,the encapsulated PSMs still remained above 80%of their initial efficiency after continuous underwater illumination for 400 h.Furthermore,being exposed to air,the encapsulated PSMs maintained 94%of their original efficiency after 1000 h light illumination.This highly transparent ARC shows great potentials in enhancing the stability of perovskite devices,applicable not only to underwater cells but also extendable to land-based photovoltaic devices.展开更多
High temperature corrsoion and protection of trtanium alloys and TiAl intermetallics are reviewed, andsome suggestions on the development of protective coatings are put forward.
对乘人汽车车身铝合金薄板(ABS,Auto Body Sheet)生产工艺作了全面的阐述,特别是对热处理工艺中的双级时效(预时效与喷漆后的烘烤时效)作了重点介绍,这是6×××系合金ABS特有的时效处理;化学转化膜处理也是宜在铝加工厂进...对乘人汽车车身铝合金薄板(ABS,Auto Body Sheet)生产工艺作了全面的阐述,特别是对热处理工艺中的双级时效(预时效与喷漆后的烘烤时效)作了重点介绍,这是6×××系合金ABS特有的时效处理;化学转化膜处理也是宜在铝加工厂进行的ABS带材生产中特有的工艺之一。ABS的预时效(pre-aging)温度为80℃,时间为15 min左右;第二阶段时效即烘烤温度为170℃,保温30 min左右,具体时间决定于漆膜固化所需的时间。无铬的锆/钛盐类转化膜处理也是ABS生产的关键工艺之一。中国在2013年前还不具备批量生产ABS的条件,必须建设这类产品生产项目,为汽车的轻量化与国家节能减排政策的推广提供充分的物质基础。展开更多
基金The authors gratefully acknowledge the financial support of the Brazilian research funding agency CNPq and the Coordination for the Improvement of Higher Education Personnel(CAPES)
文摘Anti-reflective (AR) single layer of silica-titania (SiO2-TiO2) coatings were obtained from sols containing pyromellitic dianhydride (PMDA) derivatives and Ti and Si precursors on glass substrate by dip-coating method. The coatings showed very high optical quality and the transmission was improved to up to 98.5%. Furthermore, the coatings also presented good mechanical stability.
基金supported by the National Natural Science Foundation of China(Nos.62104028 and 62174021)the Creative Research Groups of the National Natural Science Foundation of Sichuan Province(No.2023NSFSC1973)+2 种基金the Natural Science Foundation of Sichuan Province(No.2022NSFSC0899)the Guang Dong Basic and Applied Basic Research Foundation(No.2023A1515110067)the China Postdoctoral Science Foundation(No.2021M700689).
文摘Perovskite solar cells have shown great potential in the field of underwater solar cells due to their excellent optoelectronic properties;however,their underwater performance and stability still hinder their practical use.In this research,a 1H,1H,2H,2H-heptadecafluorodecyl acrylate(HFDA)anti-reflection coating(ARC)was introduced as a high-transparent material for encapsulating perovskite solar modules(PSMs).Optical characterization results revealed that HFDA can effectively reduce reflection of light below 800 nm,aiding in the absorption of light within this wavelength range by underwater solar cells.Thus,a remarkable efficiency of 14.65%was achieved even at a water depth of 50 cm.And,the concentration of Pb^(2+)for HFDA-encapsulated film is significantly reduced from 186 to 16.5 ppb after being immersed in water for 347 h.Interestingly,the encapsulated PSMs still remained above 80%of their initial efficiency after continuous underwater illumination for 400 h.Furthermore,being exposed to air,the encapsulated PSMs maintained 94%of their original efficiency after 1000 h light illumination.This highly transparent ARC shows great potentials in enhancing the stability of perovskite devices,applicable not only to underwater cells but also extendable to land-based photovoltaic devices.
文摘High temperature corrsoion and protection of trtanium alloys and TiAl intermetallics are reviewed, andsome suggestions on the development of protective coatings are put forward.
文摘对乘人汽车车身铝合金薄板(ABS,Auto Body Sheet)生产工艺作了全面的阐述,特别是对热处理工艺中的双级时效(预时效与喷漆后的烘烤时效)作了重点介绍,这是6×××系合金ABS特有的时效处理;化学转化膜处理也是宜在铝加工厂进行的ABS带材生产中特有的工艺之一。ABS的预时效(pre-aging)温度为80℃,时间为15 min左右;第二阶段时效即烘烤温度为170℃,保温30 min左右,具体时间决定于漆膜固化所需的时间。无铬的锆/钛盐类转化膜处理也是ABS生产的关键工艺之一。中国在2013年前还不具备批量生产ABS的条件,必须建设这类产品生产项目,为汽车的轻量化与国家节能减排政策的推广提供充分的物质基础。
