A new pyrene derivative BF bearing a furan group was synthesized via a one-step reaction as a colorimetric and ratiometric chemosensor for Al3＋ in ethanol-H20 （9：1, v/v, pH 7.2, HEPES buffer） solution. This chemos...A new pyrene derivative BF bearing a furan group was synthesized via a one-step reaction as a colorimetric and ratiometric chemosensor for Al3＋ in ethanol-H20 （9：1, v/v, pH 7.2, HEPES buffer） solution. This chemosensor could selectively recognize Al3＋ in the presence of other competing ions. Low limit of detection （LOD） and high association constant revealed its superior sensitivity and binding affinity toward Al3＋, Besides, the probe BF performed perfectly in a reversibility test using EDTA. The mechanism of the interaction has been confirmed by 1H NMR titration. Importantly, chemosensor BF has also been utilized to detect Al3＋ on test paper strips, which showed its ootential for practical applications.展开更多
The Co-based alloy/AISI 410 stainless steel dissimilar welded joint was fabricated by the electron beam welding(EBW)technique.The anomalous microstructure containing the element transition zone(ETZ)and/or core of tail...The Co-based alloy/AISI 410 stainless steel dissimilar welded joint was fabricated by the electron beam welding(EBW)technique.The anomalous microstructure containing the element transition zone(ETZ)and/or core of tail-like zone(CTLZ)is in the weld metal(WM)adjacent to the fusion line.The melting temperature difference between the WM and AISI 410 steel,melt stirring effect and element diffusion can trigger the formation of such anomalous microstructure.In particular,the larger distance of the region in WM away from the fusion line,the smaller CTLZ and larger ETZ occurred.Compared with the fine and ellipsoidal precipitates in the as-welded CTLZ,a large number of chain-type clustered precipitates were detected in the CTLZ and ETZ interface after the aging treatment at 566°C for 1000 h.The element diffusion under elevated temperature in WM is regarded as the crucial factor for such anomalous microstructure evolution during the aging treatment.展开更多
基金the financial support from the open fund of the State Key Laboratory of Materials-Oriented Chemical Engineering(No.KL13-07)the Specialized Research Fund for the Doctoral Program of Higher Education(No.20123221110012)+1 种基金the China Postdoctoral Science Foundation(No.2014M550287)the Postgraduate Education and Innovation Project of Jiangsu Province(No.KYLX-0772)
文摘A new pyrene derivative BF bearing a furan group was synthesized via a one-step reaction as a colorimetric and ratiometric chemosensor for Al3＋ in ethanol-H20 （9：1, v/v, pH 7.2, HEPES buffer） solution. This chemosensor could selectively recognize Al3＋ in the presence of other competing ions. Low limit of detection （LOD） and high association constant revealed its superior sensitivity and binding affinity toward Al3＋, Besides, the probe BF performed perfectly in a reversibility test using EDTA. The mechanism of the interaction has been confirmed by 1H NMR titration. Importantly, chemosensor BF has also been utilized to detect Al3＋ on test paper strips, which showed its ootential for practical applications.
基金The authors gratefully acknowledge the National Natural Science Foundation of China(Grant Nos.U1760102 and 52101042).
文摘The Co-based alloy/AISI 410 stainless steel dissimilar welded joint was fabricated by the electron beam welding(EBW)technique.The anomalous microstructure containing the element transition zone(ETZ)and/or core of tail-like zone(CTLZ)is in the weld metal(WM)adjacent to the fusion line.The melting temperature difference between the WM and AISI 410 steel,melt stirring effect and element diffusion can trigger the formation of such anomalous microstructure.In particular,the larger distance of the region in WM away from the fusion line,the smaller CTLZ and larger ETZ occurred.Compared with the fine and ellipsoidal precipitates in the as-welded CTLZ,a large number of chain-type clustered precipitates were detected in the CTLZ and ETZ interface after the aging treatment at 566°C for 1000 h.The element diffusion under elevated temperature in WM is regarded as the crucial factor for such anomalous microstructure evolution during the aging treatment.
