Crystal Growth in space is a crystalline process with long Period microgravity conditions.So far,on earth there are some facilities,such as DroP Tube,Drop Tower,Ballon,Sounding Rochets and Aircraft etc.They provide th...Crystal Growth in space is a crystalline process with long Period microgravity conditions.So far,on earth there are some facilities,such as DroP Tube,Drop Tower,Ballon,Sounding Rochets and Aircraft etc.They provide the microgravity conditions with the range of period from seconds to minutes.展开更多
In this study, acrylic acid （AA） and 4-azidoaniline were used to modify poly （N-isopropylacrylamide） （NIPAAm） in order to fabricate temperature-responsive surface for corneal epithelia cell adhesion and detachme...In this study, acrylic acid （AA） and 4-azidoaniline were used to modify poly （N-isopropylacrylamide） （NIPAAm） in order to fabricate temperature-responsive surface for corneal epithelia cell adhesion and detachment. First, NIPAAm was copolymerized with acrylic acid. Then, the copolymer was coupled with azidoaniline to synthesize AzPhPIA, derivative of p（NIPAAm-co-AA）, which possesses both thermo- and photo-sensitivities. Second, the synthesized copolymer was characterized by high performance liquid chromatography （HPLC）, Fourier transform infrared （FTIR） and a CHN analyzer. The thermo-sensitivity was characterized by temperature reducing experiment, contact angle measurement and low critical solution temperature （LCST） testing. Third, the derivatized copolymer was immobilized by photolithography on a polystyrene plate, and then the surface characterization of AzPhPIA-coated polystyrene plate （PSt） was measured by electron spectroscopy for chemical analysis （ESCA）. The thermo-sensitivity and cytocompatibility of the AzPhPIA-coated PSt were investigated by corneal epithelial cells culture. The results revealed that the AzPhPIA-coated PSt exhibited good cytocompatibility and cell detachability when temperature decreased.展开更多
Non-conjugated cluster luminescent materials have attracted much attention because of their good biocompatibility and low environmental toxicity. However,it has been difficult to achieve tunable cluster luminescent na...Non-conjugated cluster luminescent materials have attracted much attention because of their good biocompatibility and low environmental toxicity. However,it has been difficult to achieve tunable cluster luminescent nanomaterials. Herein,a series of non-conjugated polysiloxane nanomaterials are synthesized from organosiloxane by a low temperature solution method. Polysiloxanes with terminal groups of amino (PAS) and urea (PUS) exhibit high luminescence quantum yield and long-lived room temperature phosphorescence (RTP) due to the formation of suitable spatial clusters. Interestingly,doping different types and contents of nonaromatic vip small molecules can effectively regulate the structure and composition of the clusters in polysiloxanes,thus resulting in full-color unconventional cluster luminescence with high quantum yield (up to 44%),long lifetime (up to 560 ms),and emission wavelengths from 380 nm to 753 nm. Additionally,the fluorescence and RTP of PAS are very sensitive to silver ions,which can be used to probe Ag^(+) in aqueous solutions with a detection limit as low as 0.027 nM. This double response detection can not only avoid the interference of background fluorescence,but also verify the accuracy of experimental results.展开更多
文摘Crystal Growth in space is a crystalline process with long Period microgravity conditions.So far,on earth there are some facilities,such as DroP Tube,Drop Tower,Ballon,Sounding Rochets and Aircraft etc.They provide the microgravity conditions with the range of period from seconds to minutes.
基金supported by the National Natural Science Foundation of China (Nos.30970731 and 50832002)the Natural Science Foundation of Guangdong Province(No.9151063101000015)
文摘In this study, acrylic acid （AA） and 4-azidoaniline were used to modify poly （N-isopropylacrylamide） （NIPAAm） in order to fabricate temperature-responsive surface for corneal epithelia cell adhesion and detachment. First, NIPAAm was copolymerized with acrylic acid. Then, the copolymer was coupled with azidoaniline to synthesize AzPhPIA, derivative of p（NIPAAm-co-AA）, which possesses both thermo- and photo-sensitivities. Second, the synthesized copolymer was characterized by high performance liquid chromatography （HPLC）, Fourier transform infrared （FTIR） and a CHN analyzer. The thermo-sensitivity was characterized by temperature reducing experiment, contact angle measurement and low critical solution temperature （LCST） testing. Third, the derivatized copolymer was immobilized by photolithography on a polystyrene plate, and then the surface characterization of AzPhPIA-coated polystyrene plate （PSt） was measured by electron spectroscopy for chemical analysis （ESCA）. The thermo-sensitivity and cytocompatibility of the AzPhPIA-coated PSt were investigated by corneal epithelial cells culture. The results revealed that the AzPhPIA-coated PSt exhibited good cytocompatibility and cell detachability when temperature decreased.
基金supported by the National Natural Science Foundation of China(22075044)the Natural Science Foundation of Fujian Province(2017J01684).
文摘Non-conjugated cluster luminescent materials have attracted much attention because of their good biocompatibility and low environmental toxicity. However,it has been difficult to achieve tunable cluster luminescent nanomaterials. Herein,a series of non-conjugated polysiloxane nanomaterials are synthesized from organosiloxane by a low temperature solution method. Polysiloxanes with terminal groups of amino (PAS) and urea (PUS) exhibit high luminescence quantum yield and long-lived room temperature phosphorescence (RTP) due to the formation of suitable spatial clusters. Interestingly,doping different types and contents of nonaromatic vip small molecules can effectively regulate the structure and composition of the clusters in polysiloxanes,thus resulting in full-color unconventional cluster luminescence with high quantum yield (up to 44%),long lifetime (up to 560 ms),and emission wavelengths from 380 nm to 753 nm. Additionally,the fluorescence and RTP of PAS are very sensitive to silver ions,which can be used to probe Ag^(+) in aqueous solutions with a detection limit as low as 0.027 nM. This double response detection can not only avoid the interference of background fluorescence,but also verify the accuracy of experimental results.
