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Patent
CAS Institute of Chemistry and II VI Incorporated | Date: 2016-09-12

Disclosed is method of preparing a selenium carbon composite material and a use of the selenium carbon composite material in a cathode of a lithium selenium secondary battery. A battery formed with a cathode of the disclosed selenium carbon composite material has high energy density and stable electrochemical performance. The disclosed selenium carbon composite material can effectively shorten the migration distance of lithium ions during charging and discharging of the battery and improve conductivity and utilization of selenium after compounding carbon and selenium. Multiple batteries formed with cathodes of the disclosed selenium carbon composite material can be assembled into a lithium selenium pouch-cell battery having stable electrochemical performance and high energy density.


Chen Y.,CAS Institute of Chemistry
Macromolecules | Year: 2012

Shaped hairy polymer nanoobjects are defined as a kind of polymeric particles with persistent geometric shape and densely tethered polymer hairs. Their size, at least in one dimension, should not exceed 100 nm. Components of the nanoobjects are mainly organic polymers, and therefore, they exhibit viscoelasticity and stimuli responsibility in general. Namely, they are soft nanomatter, greatly differing from those stiff and rigid inorganic nanoparticles. While spherical polymeric nanoparticles have been studied intensively, much less attention has been paid to those nonspherical hairy polymer nanoparticles like cylindrical and lamellar ones. The reasons are because fabrication of the shaped soft nanoparticles is still difficult and also less information has been known about the shape-induced properties, especially in biomedical application. In recent years, scientists are realizing that the shape of nanoparticles does matter to their properties of plasma circulation in mice and cell uptake, revealing a nearly unexplored area. In this Perspective, the author would like to focus on these soft nanoobjects with shapes and tethered polymeric hairs by introducing how to shape them, to densely tether polymer hairs, and why the hair and the shape are important. © 2012 American Chemical Society.


Lang X.,Nanyang Technological University | Chen X.,Nanyang Technological University | Zhao J.,CAS Institute of Chemistry
Chemical Society Reviews | Year: 2014

The future development of chemistry entails environmentally friendly and energy sustainable alternatives for organic transformations. Visible light photocatalysis can address these challenges, as reflected by recent intensive scientific endeavours to this end. This review covers state-of-the-art accomplishments in visible-light-induced selective organic transformations by heterogeneous photocatalysis. The discussion comprises three sections based on the photocatalyst type: metal oxides such as TiO2, Nb 2O5 and ZnO; plasmonic photocatalysts like nanostructured Au, Ag or Cu supported on metal oxides; and polymeric graphitic carbon nitride. Finally, recent strides in bridging the gap between photocatalysis and other areas of catalysis will be highlighted with the aim of overcoming the existing limitations of photocatalysis by developing more creative synthetic methodologies. © 2014 The Royal Society of Chemistry.


Patent
Procter, Gamble and CAS Institute of Chemistry | Date: 2016-02-25

A photonic crystal microsphere, comprising: a plurality of mono-dispersed polymer particles in a closely-packed and regularly-ordered structure, with interstition therebetween, forming the photonic crystal microsphere; and a co-assembly material contained in the interstition. The photonic crystal microsphere provides a structure of enhanced strength and a good color effect.


Li J.,CAS Institute of Chemistry | Grimsdale A.C.,Nanyang Technological University
Chemical Society Reviews | Year: 2010

Polymers based upon 2,7-disubstituted carbazole have recently become of great interest as electron-donating materials in organic photovoltaic devices. In this tutorial review the synthesis of such polymers and their relative performances in such devices are surveyed. In particular structure-property relationships are investigated and the potential for the rational design of materials for high efficiency solar cells is discussed. In the case of the 2,7-carbazole homopolymer it has been found that electron acceptors other than fullerenes produce higher energy conversion efficiencies. To get around possible problems with the build-up of charge density at the 3- and 6-positions and to improve the solar light harvesting ability of the polymers by reducing the bandgap, ladder- and step-ladder type 2,7-carbazole polymers have been synthesised. The fully ladderised polymers gave very poor results in devices, but efficiencies of over 1% have been obtained from a step-ladder polymer with a diindenocarbazole monomer unit. Donor-acceptor copolymers containing 2,7-carbazole donors and various electron-accepting comonomer units have been prepared. An efficiency of 6% has been reported from a device using such a copolymer and by suitable choice of the acceptor comonomer, polymers can be designed with potential theoretical power conversion efficiencies of 10%. While such efficiencies remain to be obtained, the results to date certainly suggest that carbazole-based polymers and copolymers are among the most promising materials yet proposed for obtaining high efficiency organic solar cells. © 2010 The Royal Society of Chemistry.


Patent
CAS Institute of Chemistry | Date: 2016-01-05

A planographic printing system and method. The planographic printing system comprises an ink supply device, a planographic printing plate and a printing stock, the planographic printing plate gains ink from the ink supply device, so as to transfer graphic-text information from the planographic printing plate to surface of the printing stock, the planographic printing plate comprises a substrate, an ink repulsive layer attaching to the surface of the substrate and a graphic-text layer attaching to partial surface of the ink repulsive layer, the ink repulsive layer comprises fluoropolymer and silicon-containing nano-particle dispersed in the fluoropolymer, the fluoropolymer comprises fluorine-containing structural unit and optional acrylate-based structural unit. The present invention may achieve a graphic-text area which is affinity to water-based printing ink and a blank area which is repulsion to water-based printing ink on the surface of the printing plate by using water-based printing ink only without water or fountain solution.


Patent
CAS Institute of Chemistry | Date: 2016-01-05

A printing plate, its preparation method, and a printing method. The printing plate comprises a substrate, an ink repulsive layer attaching to the surface of the substrate and a graphic-text layer attaching to partial surface of the ink repulsive layer, the ink repulsive layer comprises fluoropolymer and silicon-containing nano-particle dispersed in the fluoropolymer, the fluoropolymer comprises fluorine-containing structural unit and optional acrylate-based structural unit. The present invention constitutes a graphic-text area which is affinity to water-based printing ink and an area without graphic-text which is repulsion to water-based printing ink on the surface of the planographic printing plate.


The present invention discloses a nano-silver powder dispersible in environment friendly weak solvents, method for preparing the same and an electrically conductive ink comprising the nano-silver powder. The present invention employs a disperser dissoluble in water and weak solvents and an alcohol amine as reducing agent to prepare mono-dispersed nano-silver, and employs ultrafiltration for purification and spray drying process to obtain a nano-silver powder dispersible in weak solvents, and thereby obtain an eco-solvent nano-silver electrically conductive ink. The electrically conductive ink in accordance with the present application has advantages of high safety, low volatility, low toxicity, high flash point, resistant to ultraviolet radiation and moisture etc., and can be used with uncoated bearing substrates, and is suitable for use in outdoor environments.


The present invention discloses a method for preparing nano-copper powder and nano-copper powder prepared by the same. The method disclosed in the present invention comprises: (1) providing a dispersion solution, the dispersion solution contains at least one copper salt precursor and at least one disperser, the disperser is dissoluble in both water and weak solvents; (2) providing a reducer dispersion solution, the reducer dispersion solution contains at least one reducer; (3) contacting the reducer dispersion solution with the dispersion solution provided by step (1) in a condition enough to reduce the copper salt precursor by the reducer into elementary copper; (4) separating copper nano-particles from reaction solution obtained by step (3), and drying separated copper nano-particles by spray drying, so as to obtain the nano-copper powder. The nano-copper powder prepared by the method in accordance with the present invention is dispersible in both water and environment-friendly weak solvents. Therefore, the obtained nano-copper powder can be used to prepare weak solvent-type electrically conductive ink and overcome the drawbacks of poor weather resisting property of water-based electrically conductive ink and severe environmental pollution of solvent-type electrically conductive ink.


Patent
CAS Institute of Chemistry | Date: 2016-08-10

The present invention discloses a planographic printing system and a planographic printing method. The planographic printing system comprises an ink supply device, a planographic printing plate and a printing stock, the planographic printing plate gains ink from the ink supply device, so as to transfer graphic-text information from the planographic printing plate to surface of the printing stock, the planographic printing plate comprises a substrate, an ink repulsive layer attaching to the surface of the substrate and a graphic-text layer attaching to partial surface of the ink repulsive layer, the ink repulsive layer comprises fluoropolymer and silicon-containing nano-particle dispersed in the fluoropolymer, the fluoropolymer comprises fluorine-containing structural unit and optional acrylate-based structural unit. The present invention breaks through the concept that conventional planographic printing applies the principle of oil-water repulsion, the present invention may achieve a graphic-text area which is affinity to water-based printing ink and a blank area which is repulsion to water-based printing ink on the surface of the printing plate by using water-based printing ink only without using water or fountain solution. The planographic printing system according to the present invention has desirable pressrun and the presswork obtained by using the printing plate has high resolution.

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