Archive for the ‘Materials’ Category

Highly efficient blue electrophosphorescence using simple CBP isomers with high triplet energies

Phosphorescent organic light-emitting diodes (PhOLEDs) offer high quantum efficiency compared to conventional fluorescent OLEDs because they can harness both singlet and triplet exitons for emission. Green and red PhOLEDs with 100% internal quantum efficiency have been reported, but highly efficient and stable blue PhOLEDs have yet to be developed because of the lack of suitable host materials possessing higher triplet energy levels than blue phosphors. In this hot paper Chuluo Yang, Dongge Ma and colleagues report two simple CBP isomers with high triplet energies as efficient hosts for blue phosphorescent OLEDs, and the efficiencies of the o-CBP-based device are over 2 times higher than those of CBP. Interested to know more? Read the article for free until 2nd March. (Free registration required)

Efficient blue electrophosphorescence using CBP isomers

Simple CBP isomers with high triplet energies for highly efficient blue electrophosphorescence: Shaolong Gong, Xun He, Yonghua Chen, Zuoquan Jiang, Cheng Zhong, Dongge Ma, Jingui Qin and Chuluo Yang, J. Mater. Chem., 2012, 22, 2894-2899

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- Russell Johnson, Development Editor, Journal of Materials Chemistry

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Biofunctionalised graphene as an anticoagulant

Wang et al, 2012Scientists in China have come up with a green way to reduce graphene oxide so that it can be used in the biomedical field.

The team has used the anticoagulant heparin, a straight-chain anionic glycosaminoglycan and a natural polymer, to reduce and stabilise the graphene oxide. The heparin–reduced graphene oxide sheets show excellent biocompatibility and activity as a blood anticoagulant, according to the researchers. They also say that the heparin–reduced graphene oxide could bind strongly to anticancer drugs for highly efficient loading.

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Green and easy synthesis of biocompatible graphene for use as an anticoagulant
Yi Wang, Pu Zhang, Chun Fang Liu, Lei Zhan, Yuan Fang Li and Cheng Zhi Huang
RSC Adv., 2012, Advance Article, DOI: 10.1039/C2RA00841F

- Kathleen Too

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Two Hot Papers on materials for white LEDs

Graphical abstract: Highly efficient single-layer white polymer light-emitting devices employing triphenylamine-based iridium dendritic complexes as orange emissive componentDendritic complexes for white polymer light-emitting diodes. Chinese scientists have fabricated single-layer white polymer light-emitting devices (WPLED) by double-doping sky-blue emitter iridium(III) bis(2-(4,6-difluorophenyl)-pyridinato-N,C2)picolinate (FIrpic) into orange iridium dendrimers. These WPLEDs achieve the maximum current/power/external quantum efficiencies of 37.0 cd A−1/19.4 lm W−1/18.5%, which are among the highest efficiencies for dual-color WPLEDs ever reported.

Highly efficient single-layer white polymer light-emitting devices employing triphenylamine-based iridium dendritic complexes as orange emissive component: Minrong Zhu, Jianhua Zou, Sujun Hu, Chen’ge Li, Chuluo Yang, Hongbin Wu, Jingui Qin and Yong Cao, J. Mater. Chem., 2012, 22, 361-366

Graphical abstract: Stacking-induced white-light and blue-light phosphorescence from purely organic radical materialsStacking-induced phosphorescence from organic radical materials. A new class of organic phosphorescent materials have been developed by scientists at University of Science and Technology of China. Based on salts of an organic radical material, the phosphorescent complexes show stacking-induced white-light and blue-light phosphorescence. The team say that these materials could lead to new LEDs.

Stacking-induced white-light and blue-light phosphorescence from purely organic radical materials: Guo-Ping Yong, Yi-Man Zhang, Wen-Long She and Ying-Zhou Li, J. Mater. Chem., 2011, 21, 18520-18522

Read both of the papers for free until 12th January (free registration required).

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- Russell Johnson, Development Editor, Journal of Materials Chemistry

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Sulfonated copolymers with SO3H and COOH groups for the hydrolysis of polysaccharides

Sulfonated copolymers for the hydrolysis of polysaccharidesHydrolysis of polysaccharides in unused biomass offers a sustainable method to produce glucose and other chemicals derived from it.

In an effort to make the process more commercially viable, scientists at Qingdao Institute of Bioenergy and Bioprocess Technology, China, have designed and synthesized efficient catalysts for the hydrolysis of starch and cellulose based on copolymers of poly(acrylic acid) and poly(styrene sulfonic acid). The random copolymer PAA-r-PSSH gave the highest glucose yield among the prepared catalysts which the team attribute to the synergic effect of the SO3H and COOH groups in the polymer chain.

Read the article for free until 30th December (free registration required):

Sulfonated copolymers with SO3H and COOH groups for the hydrolysis of polysaccharides
Xiutao Li, Yijun Jiang, Li Shuai, Lili Wang, Lingqian Meng and Xindong Mu
J. Mater. Chem., 2012, Advance Article
DOI: 10.1039/C1JM12954F

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- Russell Johnson, Development Editor, Journal of Materials Chemistry

Sulfonated copolymers with SO3H and COOH groups for the hydrolysis of polysaccharides
Xiutao Li, Yijun Jiang, Li Shuai, Lili Wang, Lingqian Meng and Xindong Mu
J. Mater. Chem., 2012, Advance Article
DOI: 10.1039/C1JM12954F
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Hot Paper: Graphene supported Au-Pd bimetallic nanoparticles with core-shell structures and superior peroxidase-like activities

Chen et al., 2011Au@Pd bimetallic nanoparticles were successfully dispersed on graphene by a simple one step reducing method.

The bimetallic nanoparticles show superior catalytic activity over the monometallic counterparts. Including the Au core minimizes the use of more expensive Pd precursors and plays an important role in enhancing the catalytic activity arising from the strong catalytic bimetallic electronic ligand interactions. The composition and shell thickness of the nanoparticles is controlled by loading different amounts of the metallic precursors. Interested to know more? Read the article for free until 16th December…

Graphene supported Au-Pd bimetallic nanoparticles with core-shell structures and superior peroxidase-like activities
Hongyu Chen, Yang Li, Fengbao Zhang, Guoliang Zhang and Xiaobin Fan
J. Mater. Chem., 2011, 21, 17658-17661
DOI: 10.1039/C1JM13356J

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- Russell Johnson, Development Editor, Journal of Materials Chemistry

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Hot Article: Nanoparticles that capture, kill and remove pathogens

Nanoparticles for pathogen removalResearchers combined silver nanoparticles and iron oxide to make nanoparticles with Ag@Fe2O3 yolk–shell structure.

After functionalization of the surface with glucose, these magnetic nanoparticles show high capture efficiency of bacteria and potent antibacterial activity because of Ag cores.

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Communication: Multifunctional Ag@Fe2O3 yolk–shell nanoparticles for simultaneous capture, kill, and removal of pathogen
Zhanhua Wei, Zijian Zhou, Meng Yang, Chenghong Lin, Zhenghuan Zhao, Dengtong Huang, Zhong Chen and Jinhao Gao
J. Mater. Chem., 2011, 21, 16344-16348
DOI: 10.1039/C1JM13691G

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- Russell Johnson, Development Editor, Journal of Materials Chemistry

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Hot Communication: Chameleon clothes for quantitative oxygen imaging

A chameleon cloth that changes colour in response a drop in oxygen concentration could be used to warn of oxygen deficient areas say Chinese scientists.

The colour of the cloth gradually changes from red to purple to blue as the oxygen concentration increases. The light, soft and flexible cotton cloth could be easily included in clothes to make wearable sensors the team say.

Chameleon clothes

Read the full paper for free until 8th December:

Communication: Chameleon clothes for quantitative oxygen imaging
Xu-dong Wang, Ting-yao Zhou, Xin-hong Song, Yaqi Jiang, Chaoyong James Yang and Xi Chen
J. Mater. Chem., 2011, 21, 17651-17653
DOI: 10.1039/C1JM14162G

This paper was also featured in Chemistry World.

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- Russell Johnson, Development Editor, Journal of Materials Chemistry

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Hot Paper: Yellow to Red: A soft porous crystal with mechanofluorochromism

Construction of soft porous crystal with silole derivativeA soft porous crystal which changes its fluorescence in response to mechanical grinding and heat has been developed by scientists in China.

Applying mechanical force changes the organic crystal’s fluorescence from yellow through to cherry red. Heating the crystal reverses this. The team say this mechanofluorochromism is caused by the crystal going through multiple structural transformations.

Read the full paper for free until 5th December:

Construction of soft porous crystal with silole derivative: strategy of framework design, multiple structural transformability and mechanofluorochromism
J. Mei, J. Wang, A. Qin, H. Zhao, W. Yuan, Z. Zhao, H. H. Y. Sung, C. Deng, S. Zhang, I. D. Williams, J. Z. Sun and B. Z. Tang
J. Mater. Chem., 2012, Advance Article
DOI: 10.1039/C1JM12673C

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- Russell Johnson, Development Editor, Journal of Materials Chemistry

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