The unveiling of MOF growth mechanism is hampered by the lack of fundamental knowledge about the very early stage of nucleation,especially the form and ratio of molecular species in the solution for crystal growth.Her...The unveiling of MOF growth mechanism is hampered by the lack of fundamental knowledge about the very early stage of nucleation,especially the form and ratio of molecular species in the solution for crystal growth.Herein,we report the detection of growth species for a series of MOFs with mono-linker,CuMOF-2-BDC and Cu-MOF-2-NDC,and two linkers,MTV-MOF-2-(C_(4)H_(4))x,by high resolution ESI-MS,where a large variety of Cu-containing species are identified unambiguously.The solvent molecules such as H_(2)O,methanol and DMF participate in the formation of these species,other than ethanol.Furthermore,in the growth solution of MTV-MOF-2-(C_(4)H_(4))x,growth species containing two different organic linkers are observed.The feeding ratio is not the only factor controlling the distribution of growth species for MTVMOFs,but also the solvent involves in coordination,an aspect usually overlooked previously.展开更多
Fiber Bragg grating has been successfully fabricated in the silica microfiber by the use of femtosecond laser point-by-point inscription.Temporal thermal response of the fabricated silica microfiber Bragg grating has ...Fiber Bragg grating has been successfully fabricated in the silica microfiber by the use of femtosecond laser point-by-point inscription.Temporal thermal response of the fabricated silica microfiber Bragg grating has been measured by the use of the CO_(2) laser thermal excitation method,and the result shows that the time constant of the microfiber Bragg grating is reduced by an order of magnitude compared with the traditional single-mode fiber Bragg grating and the measured time constant is〜21 ms.展开更多
基金the National Natural Science Foundation of China(Nos.91545205,91622103,21971199 and 22025106)National Key Research and Development Project(Nos.2020YFB1505700,2016YFA0200700 and 2018YFA-0704000)+1 种基金Innovation Team of Wuhan University(No.2042017kf0232)the Fundamental Research Funds for the Central Universities(No.2042020kf0214)。
文摘The unveiling of MOF growth mechanism is hampered by the lack of fundamental knowledge about the very early stage of nucleation,especially the form and ratio of molecular species in the solution for crystal growth.Herein,we report the detection of growth species for a series of MOFs with mono-linker,CuMOF-2-BDC and Cu-MOF-2-NDC,and two linkers,MTV-MOF-2-(C_(4)H_(4))x,by high resolution ESI-MS,where a large variety of Cu-containing species are identified unambiguously.The solvent molecules such as H_(2)O,methanol and DMF participate in the formation of these species,other than ethanol.Furthermore,in the growth solution of MTV-MOF-2-(C_(4)H_(4))x,growth species containing two different organic linkers are observed.The feeding ratio is not the only factor controlling the distribution of growth species for MTVMOFs,but also the solvent involves in coordination,an aspect usually overlooked previously.
文摘Fiber Bragg grating has been successfully fabricated in the silica microfiber by the use of femtosecond laser point-by-point inscription.Temporal thermal response of the fabricated silica microfiber Bragg grating has been measured by the use of the CO_(2) laser thermal excitation method,and the result shows that the time constant of the microfiber Bragg grating is reduced by an order of magnitude compared with the traditional single-mode fiber Bragg grating and the measured time constant is〜21 ms.
