Fabrication of polyurethane molecular stamps (PU stamps) based on polypropylene glycol (PPG) and toluene diisocyanate (TDI), using 3, 3-dichloro-4, 4-methylenedianiline (MOCA) as the crosslinker, is reported. It wa...Fabrication of polyurethane molecular stamps (PU stamps) based on polypropylene glycol (PPG) and toluene diisocyanate (TDI), using 3, 3-dichloro-4, 4-methylenedianiline (MOCA) as the crosslinker, is reported. It was shown from the contact angle measurement that PU stamps surface has good affinity with acetonitrile, guaranteeing the well distribution of DNA monomers on patterned stamps. Laser confocal fluorescence microscopy images of oligonucleotide arrays after hybridization confirmed polyurethane is an excellent material for molecular stamps when transferring polar chemicals and conducting reactions on interfaces by stamping.展开更多
The Zn-Cu(I)/HMCM-41 catalysts were successfully prepared in laboratory scale by solid-state ion exchange with CuCl salt, together with introduction of Zn to improve the dispersion degree of the active component Cu(I)...The Zn-Cu(I)/HMCM-41 catalysts were successfully prepared in laboratory scale by solid-state ion exchange with CuCl salt, together with introduction of Zn to improve the dispersion degree of the active component Cu(I) on the surface. With increase of the amounts of Zn and CuCl from 0% to 9.0% and 25.0% respectively, CO adsorption the amounts of increased from 10.6 mmol/g to 183.0 mmol/g correspondingly. The in situ FT-IR spectra for CO adsorption demonstrated that there existed two dynamic equilibriums between surface carbonyl complexes: Cu(CO)3+ Cu(CO)2++ CO and Cu(CO)2+ Cu(CO)+ + CO. The equilibriums can be shifted reversibly by changing the temperature and pressure. Due to the modified MCM-41 mesoporous materials possess both of the acidic and metallic carbonyl centers, this kind of material can be developed into mesoporous bifunctional catalysts for carbonylation reactions, in which larger molecules are involved.展开更多
Mercaptopropyltrimethoxysilane (MPTS) bearing mercapto groups was used to form self-assembly monolayers (SAMs) on glass substrates by solution extraction. SEM, XRD and rubbing test analysis illustrated that the Ag fi...Mercaptopropyltrimethoxysilane (MPTS) bearing mercapto groups was used to form self-assembly monolayers (SAMs) on glass substrates by solution extraction. SEM, XRD and rubbing test analysis illustrated that the Ag film on the SAMs-modified glass was more durable than that on the commonly-modified glass and that the crystallinity of Ag film on the SAMs-modified glass was identical with those of the Ag film on the commonly-modified glass and pure Ag.展开更多
基金supported by the Chinese 863 High-Tech Proiect973 National Key Fundamental Rescareh Project+3 种基金the National Natural Science Foundation of ChinaVisiting Scholar Foundation of Key lab.University of ChinaThe Jiangsu High-Tcch Projectthe Hangke Fund of Southeast University
文摘Fabrication of polyurethane molecular stamps (PU stamps) based on polypropylene glycol (PPG) and toluene diisocyanate (TDI), using 3, 3-dichloro-4, 4-methylenedianiline (MOCA) as the crosslinker, is reported. It was shown from the contact angle measurement that PU stamps surface has good affinity with acetonitrile, guaranteeing the well distribution of DNA monomers on patterned stamps. Laser confocal fluorescence microscopy images of oligonucleotide arrays after hybridization confirmed polyurethane is an excellent material for molecular stamps when transferring polar chemicals and conducting reactions on interfaces by stamping.
文摘The Zn-Cu(I)/HMCM-41 catalysts were successfully prepared in laboratory scale by solid-state ion exchange with CuCl salt, together with introduction of Zn to improve the dispersion degree of the active component Cu(I) on the surface. With increase of the amounts of Zn and CuCl from 0% to 9.0% and 25.0% respectively, CO adsorption the amounts of increased from 10.6 mmol/g to 183.0 mmol/g correspondingly. The in situ FT-IR spectra for CO adsorption demonstrated that there existed two dynamic equilibriums between surface carbonyl complexes: Cu(CO)3+ Cu(CO)2++ CO and Cu(CO)2+ Cu(CO)+ + CO. The equilibriums can be shifted reversibly by changing the temperature and pressure. Due to the modified MCM-41 mesoporous materials possess both of the acidic and metallic carbonyl centers, this kind of material can be developed into mesoporous bifunctional catalysts for carbonylation reactions, in which larger molecules are involved.
基金This research is supported by the Chinese 863 High-Tech Project Natural Science Foundation of China+5 种基金 the Excellent Teacher抯 Foundation of Ministry of Education China High-Tech Project of Jiangsu Natural Science Foundation of Hunan China Edu
文摘Mercaptopropyltrimethoxysilane (MPTS) bearing mercapto groups was used to form self-assembly monolayers (SAMs) on glass substrates by solution extraction. SEM, XRD and rubbing test analysis illustrated that the Ag film on the SAMs-modified glass was more durable than that on the commonly-modified glass and that the crystallinity of Ag film on the SAMs-modified glass was identical with those of the Ag film on the commonly-modified glass and pure Ag.
