This paper studied the deactivation of propionyl shikonin(PS) to tobacco mosaic virus(TMV).After preparation and isolation of TMV coat protein(CP),concentration and purity test were made by SDS-PAGE and MALDI-TOF MS.B...This paper studied the deactivation of propionyl shikonin(PS) to tobacco mosaic virus(TMV).After preparation and isolation of TMV coat protein(CP),concentration and purity test were made by SDS-PAGE and MALDI-TOF MS.Bonding of PS and TMV-CP was determined also by MALDI-TOF MS.Peptide mass spectra of trypsin enzymolysis treated by propionyl shikonin were studied.Based on the rate of changes of peptide relative abundance of TMV-CP bonding with PS,the bonding site was computed with SGI workstation,the pKa value was 4.95.展开更多
It is well established that paper-based separators display short-circuit risk in lithium-ion batteries due to their intrinsic micron-sized pores.In this research,we have adjusted pore structure of paper by fiber swell...It is well established that paper-based separators display short-circuit risk in lithium-ion batteries due to their intrinsic micron-sized pores.In this research,we have adjusted pore structure of paper by fiber swelling in liquid electrolyte.Specifically,the paper-based separator is prepared by propionylated sisal fibers through a wet papermaking process.Scanning electron microscope(SEM)and multi-range X-ray nano-computed tomography(CT)images display strong swelling of modified fibers after electrolyte absorption,which can effectively decrease the pore size of separator.Due to the high electrolyte uptake(817 wt%),paper-based separator exhibits ionic conductivity of 2.93 mS cm^(-1).^(7)Li solid-state NMR spectroscopy and Gaussian simulation reveal that the formation of local high Li^(+)ion concentration in the separator and its low absorption energy with Li^(+) ion(62.2 kcal mol^(-1))is conducive to the ionic transportation.In particular,the assembled Li/separator/LiFePO_(4) cell displays wide electrochemical stability window(5.2 V)and excellent cycle performance(capacity retention of 96.6%after 100 cycles at 0.5C)due to the reduced side reactions as well as enhanced electrolyte absorption and retention capacity by propionylation.Our proposed strategy will provide a novel perspective to design high-performance biobased separators to boost the development of clean and sustainable energy economy.展开更多
(R)-N-(β-Trichlorogermyl propionyl)thiazolidine-2-thione-4-carboxylic methyl ether(1) and its sesquioxide(2) were synthesized. The crystal structure of 1 was determined by means of X-ray diffraction analysis, which s...(R)-N-(β-Trichlorogermyl propionyl)thiazolidine-2-thione-4-carboxylic methyl ether(1) and its sesquioxide(2) were synthesized. The crystal structure of 1 was determined by means of X-ray diffraction analysis, which shown that the >CO and >CS groups are located in the opposite sides of C(4)—N—C(3) bond with transconfiguration. The electronic structures and optimized configurations of compounds 1 and 2 were studied with MNDO method.展开更多
A new fluorinated polystyrene bearing a p substituted perfluoro[1 (2 fluorosulfonylethoxy)]ethyl group was synthesized via one electron oxidation of polystyrene by perfluoro[2 (2 fluorosulfonyl ethoxy)]prop...A new fluorinated polystyrene bearing a p substituted perfluoro[1 (2 fluorosulfonylethoxy)]ethyl group was synthesized via one electron oxidation of polystyrene by perfluoro[2 (2 fluorosulfonyl ethoxy)]propionyl peroxide at different peroxide to polystyrene molar ratios. The yield of perfluoroalkylation decreases with the increase of the reactant molar ratio. The modified polymer has been characterized by various techniques: the ring pefluoro[1 (2 fluorosulfonylethoxy)]ethylation has been proved by FT IR and 19 F NMR; the X ray photoelectron spectra (XPS) show the maximum binding energy of F 1s , O 1s , C 1s (two kinds of carbon atoms, namely C H and C F) and S 2p , respectively; desulfonylation of the fluorinated polystyrene appearing at 217 ℃ has been found by its thermogravimetric analysis (TGA). The determinations of contact angle, refractive index and glass transition temperature of the modified polymer have disclosed that when the contact angle increases with the increase of the molar ratio, the refractive index and glass transition temperature decrease. The polydispersity values indicate that the degradation of the polymer chains did not occur during the reaction.展开更多
文摘This paper studied the deactivation of propionyl shikonin(PS) to tobacco mosaic virus(TMV).After preparation and isolation of TMV coat protein(CP),concentration and purity test were made by SDS-PAGE and MALDI-TOF MS.Bonding of PS and TMV-CP was determined also by MALDI-TOF MS.Peptide mass spectra of trypsin enzymolysis treated by propionyl shikonin were studied.Based on the rate of changes of peptide relative abundance of TMV-CP bonding with PS,the bonding site was computed with SGI workstation,the pKa value was 4.95.
基金supported by the Natural Science Foundation of Guangxi Province(2018GXNSFBA138027)the Scientific Research Foundation of Guangxi University(XGZ170232)the National Enterprise Technology Center of Guangxi Bossco Environmental Protection Technology Co.,Ltd(202100033)。
文摘It is well established that paper-based separators display short-circuit risk in lithium-ion batteries due to their intrinsic micron-sized pores.In this research,we have adjusted pore structure of paper by fiber swelling in liquid electrolyte.Specifically,the paper-based separator is prepared by propionylated sisal fibers through a wet papermaking process.Scanning electron microscope(SEM)and multi-range X-ray nano-computed tomography(CT)images display strong swelling of modified fibers after electrolyte absorption,which can effectively decrease the pore size of separator.Due to the high electrolyte uptake(817 wt%),paper-based separator exhibits ionic conductivity of 2.93 mS cm^(-1).^(7)Li solid-state NMR spectroscopy and Gaussian simulation reveal that the formation of local high Li^(+)ion concentration in the separator and its low absorption energy with Li^(+) ion(62.2 kcal mol^(-1))is conducive to the ionic transportation.In particular,the assembled Li/separator/LiFePO_(4) cell displays wide electrochemical stability window(5.2 V)and excellent cycle performance(capacity retention of 96.6%after 100 cycles at 0.5C)due to the reduced side reactions as well as enhanced electrolyte absorption and retention capacity by propionylation.Our proposed strategy will provide a novel perspective to design high-performance biobased separators to boost the development of clean and sustainable energy economy.
文摘(R)-N-(β-Trichlorogermyl propionyl)thiazolidine-2-thione-4-carboxylic methyl ether(1) and its sesquioxide(2) were synthesized. The crystal structure of 1 was determined by means of X-ray diffraction analysis, which shown that the >CO and >CS groups are located in the opposite sides of C(4)—N—C(3) bond with transconfiguration. The electronic structures and optimized configurations of compounds 1 and 2 were studied with MNDO method.
文摘A new fluorinated polystyrene bearing a p substituted perfluoro[1 (2 fluorosulfonylethoxy)]ethyl group was synthesized via one electron oxidation of polystyrene by perfluoro[2 (2 fluorosulfonyl ethoxy)]propionyl peroxide at different peroxide to polystyrene molar ratios. The yield of perfluoroalkylation decreases with the increase of the reactant molar ratio. The modified polymer has been characterized by various techniques: the ring pefluoro[1 (2 fluorosulfonylethoxy)]ethylation has been proved by FT IR and 19 F NMR; the X ray photoelectron spectra (XPS) show the maximum binding energy of F 1s , O 1s , C 1s (two kinds of carbon atoms, namely C H and C F) and S 2p , respectively; desulfonylation of the fluorinated polystyrene appearing at 217 ℃ has been found by its thermogravimetric analysis (TGA). The determinations of contact angle, refractive index and glass transition temperature of the modified polymer have disclosed that when the contact angle increases with the increase of the molar ratio, the refractive index and glass transition temperature decrease. The polydispersity values indicate that the degradation of the polymer chains did not occur during the reaction.
