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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. Source

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. Source

CAS Institute of Chemistry | Date: 2012-02-10

A new family of tetracene tetracarboxylic diimides is provided. These ones can made by reacting a 9-stannafluorene with a tetrabromo compound including a tetracene tetracarboxylic diimide core. They can be used as n-type electron-transporting materials in electronic devices such as n-channel field-effect transistors. They exhibit excellent air-stability and do not cause parasite injections of holes.

Disclosed are a pyrrolo-pyrroledione-thiophenequinone compound as shown by formula I, a preparation process thereof and the use thereof as an organic semiconductor material. The preparation process for the compound of formula I comprises reacting NaH, an -bromine substituted pyrrolo-pyrroledione-thiophene oligomer as shown by formula II and malononitrile sodium salt, in the presence of catalytic Pd(PPh

The present invention discloses a phosphorus-silicon synergistic flame retardant and the preparation method and use thereof. The phosphorus-silicon synergistic flame retardant provided by the present invention has a structural general formula shown as formula I. A new type of compound containing phosphorus and silicon is prepared by the present invention using the cheap organic boron catalyst, and employing the addition reaction of diphenyl phosphine oxide and derivatives thereof with silicone containing carbon-carbon double bond. Such compounds have the properties of hydrolytic resistance, easy purification, and low synthesis cost, etc. Phosphorus and silicon elements in the molecular structures of such compounds both can act as the flame retardants solely, and meantime can work synergistically, thereby enduing the common polymeric materials with the excellent flame retardant property.

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