Three new 1,3-bis（phenylethynyl）disilazanes were synthesized from the reaction of 1,3-dichlorodisilazanes with （phenylethynyl）lithium, and characterized by infrared （IR） spectra, nuclear magnetic resonance （NMR...Three new 1,3-bis（phenylethynyl）disilazanes were synthesized from the reaction of 1,3-dichlorodisilazanes with （phenylethynyl）lithium, and characterized by infrared （IR） spectra, nuclear magnetic resonance （NMR） and mass spectrometry （MS）.展开更多
A new silazane oligomer containing cyclotrisilazane was synthesized by KH-catalyzed dehydro-coupling reactions between diphenylsilane and 1,1,3,3,5,5-hexamethylcyclotrisilazane (D-3(N)).
Adding additives into peroskite precursor solution has been proven as a simple and efficient strategy to improve the quality of peroskite films.In this work,we demonstrate an effective additive strategy to improve the...Adding additives into peroskite precursor solution has been proven as a simple and efficient strategy to improve the quality of peroskite films.In this work,we demonstrate an effective additive strategy to improve the quality of all-inorganic perovskite films by adding a novel silazane additive heptamethyldisilazane(HDMS).The power conversion efficiency(PCE)of the optimized devices is enhanced from 14.55%to 15.31%with an open-circuit voltage over 1.26 V due to the higher quality perovskite films with lower trap density after the incorporation of HDMS.More interestingly,the HDMS devices exhibit superior humidity and thermal stability compared with the control ones.This work provides a simple and efficient strategy to enhance the device performance and stability of all-inorganic perovskite solar cells,which could facilitate its commercialization.展开更多
A new 1,3-dichlorodisilazane, 1,3-dichloro-1,3-dimethyl-1,3-divinyldisilazane (DMDV), was prepared from the reaction of hexamethyldisilazane (MMN) and methylvinyldichlorosilane. And use the same method, 1,3-dichloro-1...A new 1,3-dichlorodisilazane, 1,3-dichloro-1,3-dimethyl-1,3-divinyldisilazane (DMDV), was prepared from the reaction of hexamethyldisilazane (MMN) and methylvinyldichlorosilane. And use the same method, 1,3-dichloro-1,1,3,3-tetraphenyldisilazane (DCTPS) was also obtained in a high yield.展开更多
Novel acetylene terminated silazane compounds,with three types of substituent,were synthesized by the aminolysis of dichlorosilane with 3-aminophenylacetylene（3-APA）.Thermal property of the compounds is studied by t...Novel acetylene terminated silazane compounds,with three types of substituent,were synthesized by the aminolysis of dichlorosilane with 3-aminophenylacetylene（3-APA）.Thermal property of the compounds is studied by thermogravimetry analysis （TGA）.It shows that the acetylene terminated silazane has high temperature resistance.The char yield at 1000℃is 77.6,81.9 and 68.7 wt%for methyl,vinyl,and phenyl substituted silazane,respectively.The pyrolysis kinetics of the silazane is investigated by non-isothermal thermogravimetric measurement.The pyrolysis undergoes three stages,which is resolved by PEAKFTT.The kinetic parameters are calculated by the Kissinger method.The role of functionalities on the thermal resistance is discussed.The vinyl-silazane exhibits higher thermal stability because of higher cross-linking density.展开更多
Nowadays,nanotechnology is growing very fast,appearing every day in many fields related to this nanotechnology.In the present study silica nanoparticles(Si NPs)were synthesized,their surface was modified using a silaz...Nowadays,nanotechnology is growing very fast,appearing every day in many fields related to this nanotechnology.In the present study silica nanoparticles(Si NPs)were synthesized,their surface was modified using a silazane and mesoporous Si NPs were further used for the loading tocopherol acetate.Si NPs were synthesized from tetraethyl orthosilicate(TEOS)in the presence of NaOH,with an easily handled,well known Stober method.In this,procedure TEOS was used as a source of silica and treated with NaOH and H_(2)O,undergoing condensation and hydrolysis reactions to produce Si NPs.These Si NPs were then modified by the hexamethyl silazane to avoid agglomeration and can be used easily for targeted delivery,as smart carriers.In the end,tocopherol acetate was successfully loaded in the modified Si NPs and different parameters were recorded for optimum loading.All the samples were characterized through SEM XRD,FTIR,BET and UV-VIS spectroscopy.XRD peaks reveled the typical peak of mesoporous Si NPs appeared at 2θ=22°.The pore size was found to be 2.45 nm.BET surface area was found to be 694.29 m^(2)/g.FTIR presented the main peaks of functional groups at 1600 cm^(-1),1000 cm^(-1)and 2900 cm^(-1)respectively.Modified Si NPs were synthesized and characterized,and the tocopherol was loaded inside the mesoporous Si NPs successfully.These experiments showed that mesoporous Si NPs can be used as smart carriers to deliver broad types of drugs efficiently.展开更多
Four bis（disiloxanyl）-m-carboranes （（RSiMe2OSiMe2）2-m-C2BloHlo, R = H, vinyl, ethynyl, aUyl） were synthesized from the reaction of bis（hydroxydimethylsilyl）-m-carborane and disilazanes, and characterized by in...Four bis（disiloxanyl）-m-carboranes （（RSiMe2OSiMe2）2-m-C2BloHlo, R = H, vinyl, ethynyl, aUyl） were synthesized from the reaction of bis（hydroxydimethylsilyl）-m-carborane and disilazanes, and characterized by infrared spectra （IR）, nuclear magnetic resonance （NMR） and mass soectrometrv （MS）.展开更多
基金the financial support of the National Natural Science Foundation of China(No 50403027).
文摘Three new 1,3-bis（phenylethynyl）disilazanes were synthesized from the reaction of 1,3-dichlorodisilazanes with （phenylethynyl）lithium, and characterized by infrared （IR） spectra, nuclear magnetic resonance （NMR） and mass spectrometry （MS）.
文摘A new silazane oligomer containing cyclotrisilazane was synthesized by KH-catalyzed dehydro-coupling reactions between diphenylsilane and 1,1,3,3,5,5-hexamethylcyclotrisilazane (D-3(N)).
基金financially supported by the National Key Research and Development Program of China(Grant No.2017YFA0206600)the National Natural Science Foundation of China(Grant No.21922505)the Strategic Priority Research Program of Chinese Academy of Sciences(Grant No.XDB36000000)。
文摘Adding additives into peroskite precursor solution has been proven as a simple and efficient strategy to improve the quality of peroskite films.In this work,we demonstrate an effective additive strategy to improve the quality of all-inorganic perovskite films by adding a novel silazane additive heptamethyldisilazane(HDMS).The power conversion efficiency(PCE)of the optimized devices is enhanced from 14.55%to 15.31%with an open-circuit voltage over 1.26 V due to the higher quality perovskite films with lower trap density after the incorporation of HDMS.More interestingly,the HDMS devices exhibit superior humidity and thermal stability compared with the control ones.This work provides a simple and efficient strategy to enhance the device performance and stability of all-inorganic perovskite solar cells,which could facilitate its commercialization.
文摘A new 1,3-dichlorodisilazane, 1,3-dichloro-1,3-dimethyl-1,3-divinyldisilazane (DMDV), was prepared from the reaction of hexamethyldisilazane (MMN) and methylvinyldichlorosilane. And use the same method, 1,3-dichloro-1,1,3,3-tetraphenyldisilazane (DCTPS) was also obtained in a high yield.
文摘Novel acetylene terminated silazane compounds,with three types of substituent,were synthesized by the aminolysis of dichlorosilane with 3-aminophenylacetylene（3-APA）.Thermal property of the compounds is studied by thermogravimetry analysis （TGA）.It shows that the acetylene terminated silazane has high temperature resistance.The char yield at 1000℃is 77.6,81.9 and 68.7 wt%for methyl,vinyl,and phenyl substituted silazane,respectively.The pyrolysis kinetics of the silazane is investigated by non-isothermal thermogravimetric measurement.The pyrolysis undergoes three stages,which is resolved by PEAKFTT.The kinetic parameters are calculated by the Kissinger method.The role of functionalities on the thermal resistance is discussed.The vinyl-silazane exhibits higher thermal stability because of higher cross-linking density.
文摘Nowadays,nanotechnology is growing very fast,appearing every day in many fields related to this nanotechnology.In the present study silica nanoparticles(Si NPs)were synthesized,their surface was modified using a silazane and mesoporous Si NPs were further used for the loading tocopherol acetate.Si NPs were synthesized from tetraethyl orthosilicate(TEOS)in the presence of NaOH,with an easily handled,well known Stober method.In this,procedure TEOS was used as a source of silica and treated with NaOH and H_(2)O,undergoing condensation and hydrolysis reactions to produce Si NPs.These Si NPs were then modified by the hexamethyl silazane to avoid agglomeration and can be used easily for targeted delivery,as smart carriers.In the end,tocopherol acetate was successfully loaded in the modified Si NPs and different parameters were recorded for optimum loading.All the samples were characterized through SEM XRD,FTIR,BET and UV-VIS spectroscopy.XRD peaks reveled the typical peak of mesoporous Si NPs appeared at 2θ=22°.The pore size was found to be 2.45 nm.BET surface area was found to be 694.29 m^(2)/g.FTIR presented the main peaks of functional groups at 1600 cm^(-1),1000 cm^(-1)and 2900 cm^(-1)respectively.Modified Si NPs were synthesized and characterized,and the tocopherol was loaded inside the mesoporous Si NPs successfully.These experiments showed that mesoporous Si NPs can be used as smart carriers to deliver broad types of drugs efficiently.
基金the National Natural Science Foundation of China(No.50803070) for financial support
文摘Four bis（disiloxanyl）-m-carboranes （（RSiMe2OSiMe2）2-m-C2BloHlo, R = H, vinyl, ethynyl, aUyl） were synthesized from the reaction of bis（hydroxydimethylsilyl）-m-carborane and disilazanes, and characterized by infrared spectra （IR）, nuclear magnetic resonance （NMR） and mass soectrometrv （MS）.
