Asymmetric epoxidation of N-enoylsultams （1, 3-15） incorporating a variety of chiral sultams as the chiral induction elements with UHP/TFAA has been studied. Both diastereomeric isomers of epoxides （2, 16-28） were...Asymmetric epoxidation of N-enoylsultams （1, 3-15） incorporating a variety of chiral sultams as the chiral induction elements with UHP/TFAA has been studied. Both diastereomeric isomers of epoxides （2, 16-28） were obtained in high yield and moderate to high optical purity.展开更多
The interplay between experiments and theory has been playing an important role from the very beginning of fullerene and carbon nanotube science. In this talk, we will present our most recent studies on computational ...The interplay between experiments and theory has been playing an important role from the very beginning of fullerene and carbon nanotube science. In this talk, we will present our most recent studies on computational fullerene and single-walled carbon nanotube (SWCNT) chemistry.展开更多
Three-dimensional(3D)laser micro-and nanoprinting based upon multi-photon absorption has made its way from early scientific discovery to industrial manufacturing processes,e.g.,for advanced microoptical components.How...Three-dimensional(3D)laser micro-and nanoprinting based upon multi-photon absorption has made its way from early scientific discovery to industrial manufacturing processes,e.g.,for advanced microoptical components.However,so far,most realized 3D architectures are composed of only a single polymeric material.Here,we review 3D printing of multi-materials on the nano-and microscale.We start with material properties that have been realized,using multi-photon photoresists.Printed materials include bulk polymers,conductive polymers,metals,nanoporous polymers,silica glass,chalcogenide glasses,inorganic single crystals,natural polymers,stimuliresponsive materials,and polymer composites.Next,we review manual and automated processes achieving dissimilar material properties in a single 3D structure by sequentially photo-exposing multiple photoresists as 3D analogs of 2D multicolor printing.Instructive examples from biology,optics,mechanics,and electronics are discussed.An emerging approach–without counterpart in 2D graphical printing–prints 3D structures combining dissimilar material properties in one 3D structure by using only a single photoresist.A controlled stimulus applied during the 3D printing process defines and determines material properties on the voxel level.Change of laser power and/or wavelength,or application of quasi-static electric fields allow for the seamless manipulation of desired materials properties.展开更多
文摘Asymmetric epoxidation of N-enoylsultams （1, 3-15） incorporating a variety of chiral sultams as the chiral induction elements with UHP/TFAA has been studied. Both diastereomeric isomers of epoxides （2, 16-28） were obtained in high yield and moderate to high optical purity.
文摘The interplay between experiments and theory has been playing an important role from the very beginning of fullerene and carbon nanotube science. In this talk, we will present our most recent studies on computational fullerene and single-walled carbon nanotube (SWCNT) chemistry.
基金funding by the Deutsche Forschungsgemeinschaft(DFG,German Research Foundation)under Germany’s Excellence Strategy for the Excellence Cluster“3D Matter Made to Order”(EXC 2082/1–390761711)by the Carl Zeiss Foundation,by the Helmholtz program“Materials Systems Engineering(MSE)”by the Karlsruhe School of Optics and Photonics(KSOP).
文摘Three-dimensional(3D)laser micro-and nanoprinting based upon multi-photon absorption has made its way from early scientific discovery to industrial manufacturing processes,e.g.,for advanced microoptical components.However,so far,most realized 3D architectures are composed of only a single polymeric material.Here,we review 3D printing of multi-materials on the nano-and microscale.We start with material properties that have been realized,using multi-photon photoresists.Printed materials include bulk polymers,conductive polymers,metals,nanoporous polymers,silica glass,chalcogenide glasses,inorganic single crystals,natural polymers,stimuliresponsive materials,and polymer composites.Next,we review manual and automated processes achieving dissimilar material properties in a single 3D structure by sequentially photo-exposing multiple photoresists as 3D analogs of 2D multicolor printing.Instructive examples from biology,optics,mechanics,and electronics are discussed.An emerging approach–without counterpart in 2D graphical printing–prints 3D structures combining dissimilar material properties in one 3D structure by using only a single photoresist.A controlled stimulus applied during the 3D printing process defines and determines material properties on the voxel level.Change of laser power and/or wavelength,or application of quasi-static electric fields allow for the seamless manipulation of desired materials properties.
