Fluorinated polymers are important materials that are widely used in many areas. Herein, we report the development of a metal‐free photocontrolled radical polymerization of semifluorinated (meth)acrylates with a new ...
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Fluorinated polymers are important materials that are widely used in many areas. Herein, we report the development of a metal‐free photocontrolled radical polymerization of semifluorinated (meth)acrylates with a new visible‐light‐absorbing organocatalyst. This method enabled the production of a variety of semifluorinated polymers with narrow molar‐weight distributions from semifluorinated trithiocarbonates or perfluoroalkyl iodides. The high performance of “ON/OFF” control and chain‐extension experiments further demonstrate the utility and reliability of this method. Furthermore, to streamline the preparation of semifluorinated polymers, a scalable continuous‐flow approach has been developed. Given the broad interest in fluorinated materials and photopolymerization, we expect that this method will facilitate the development of advanced materials with unique properties.
Silica hollow sphere as mesoporous molecular sieve which had high various usability had been synthesized by the simple and inexpensive method from using a water/oil/water（W/O/W） emulsion *** silica hollow sphere as ...
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Silica hollow sphere as mesoporous molecular sieve which had high various usability had been synthesized by the simple and inexpensive method from using a water/oil/water（W/O/W） emulsion *** silica hollow sphere as the support of nickel catalyst was compared with a commercial porous silica for methane reforming reaction with carbon *** samples were characterized by N-adsorption and desorption,X-ray diffraction,H-temperature programmed reduction,Energy dispersive X-ray spectrometry,Transmission electron microscope,X-ray photoelectron spectroscopy and Thermal gravimetric *** catalytic performance of all catalysts was inquired at 750℃,atmospheric pressure and GHSV of 12500 ml·g·*** results showed that the metallic nickel supported on silica hollow sphere had smaller particle size and higher dispersion than the commercial porous ***,superior performance catalytic in methane reforming of the nickel catalyst was proposed based on the mesoporous structure in the hollow sphere,its easily passing of the reactants to spheres,particularly the amount of decreased carbon deposition.
Although various nanomaterials have been designed for biocatalysis, few of them can accelerate chemical reactions with high selectivity and stereocontrol, which remains them from being perfect alternatives to nature e...
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Although various nanomaterials have been designed for biocatalysis, few of them can accelerate chemical reactions with high selectivity and stereocontrol, which remains them from being perfect alternatives to nature enzymes. Herein, inspired by the natural enzymes, an enantioselective nanomaterial has been constructed, with gold nanoparticles (AuNPs) as active centers, chiral cysteine (Cys) as selectors for chiral recognition, and expanded mesoporous silica (EMSN) as a skeleton of the artificial enzyme. In the oxidation of chiral 3,4‐dihydroxy‐phenylalanine (DOPA), the nanozyme with d ‐Cys shows preference to l ‐DOPA while the artificial enzyme with l ‐Cys shows preference to d ‐DOPA. Subsequent calculation of apparent steady‐state kinetic parameters and activation energies together with molecular dynamics (MD) simulations showed that the different affinity precipitated by hydrogen bonding formation between chiral Cys and DOPA is the origin of chiral selectivity.
Correction for 'Molecular stacking dependent phosphorescence-fluorescence dual emission in a single luminophore for self-recoverable mechanoconversion of multicolor luminescence', Chem. Commun., 2016, DOI: .
Correction for 'Molecular stacking dependent phosphorescence-fluorescence dual emission in a single luminophore for self-recoverable mechanoconversion of multicolor luminescence', Chem. Commun., 2016, DOI: .
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