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Fang W.Q.,Key Laboratory for Ultrafine Materials | Gong X.-Q.,East China University of Science and Technology | Yang H.G.,Key Laboratory for Ultrafine Materials
Journal of Physical Chemistry Letters | Year: 2011

As an important metal oxide, anatase titanium dioxide has been widely investigated because of its many promising properties. The properties of anatase TiO 2 crystals are largely determined by exposed external surfaces. Since the breakthrough in synthesizing anatase TiO 2 single crystals with a large percentage of highly reactive {001} facets in 2008, many unusual properties and applications of these {001} facets dominant in anatase TiO 2 have been explored theoretically and experimentally, showing the industrial importance of this semiconductor material. This Perspective focuses on the theoretical simulations and application explorations of the unusual properties of anatase TiO 2 bound by highly reactive facets. Research opportunities as well as the challenges for future research in this emerging frontier are also highlighted. © 2011 American Chemical Society.

Wei L.,Key Laboratory for Ultrafine Materials | Chen Q.,Key Laboratory for Ultrafine Materials | Chen Q.,East China University of Science and Technology | Gu Y.,East China University of Science and Technology
Synthetic Metals | Year: 2010

Transparent PANI-SiO2 conducting films were prepared by hybrid of dodecylbenzene sulfonic acid-doped polyaniline (DBSA-PANI) and 3-glycidoxypropyltrimethoxysilane (GPTMS) through sol-gel route. The influence of content of DBSA-PANI on the structural, electrical and optical properties of the films was investigated. Sheet resistance of the hybrid films was 5.1 kΩ/□ and visible light transmittance was 75%, when the content of DBSA-PANI was 30 wt.%. Thermogravimetric analysis (TG) showed that the obtained films were thermally stable under 120 °C and optical bandgap of the hybrid films was determined from Tauc plots. © 2009 Elsevier B.V. All rights reserved.

Zhou K.,Key Laboratory for Ultrafine Materials | Zhu Y.,Key Laboratory for Ultrafine Materials | Yang X.,Key Laboratory for Ultrafine Materials | Luo J.,Key Laboratory for Ultrafine Materials | And 2 more authors.
Electrochimica Acta | Year: 2010

Graphene was prepared successfully by introducing -SO 3 - to separate the individual sheets. TEM, EDS and Raman spectroscopy were utilized to characterize the morphology and composition of graphene oxide and graphene. To construct the H 2O 2 biosensor, graphene and horseradish peroxidase (HRP) were co-immobilized into biocompatible polymer chitosan (CS), then a glassy carbon electrode (GCE) was modified by the biocomposite, followed by electrodeposition of Au nanoparticles on the surface to fabricate Au/graphene/HRP/CS/GCE. Cyclic voltammetry demonstrated that the direct electron transfer of HRP was realized, and the biosensor had an excellent performance in terms of electrocatalytic reduction towards H 2O 2. The biosensor showed high sensitivity and fast response upon the addition of H 2O 2, under the conditions of pH 6.5, potential -0.3 V. The time to reach the stable-state current was less than 3 s, and the linear range to H 2O 2 was from 5 × 10 -6 M to 5.13 × 10 -3 M with a detection limit of 1.7 × 10 -6 M (S/N = 3). Moreover, the biosensor exhibited good reproducibility and long-term stability. © 2010 Elsevier Ltd. All rights reserved.

Gong F.,Key Laboratory for Ultrafine Materials | Cheng X.,Key Laboratory for Ultrafine Materials | Wang S.,University of Tennessee at Knoxville | Zhao Y.,Key Laboratory for Ultrafine Materials | And 2 more authors.
Acta Biomaterialia | Year: 2010

We have synthesized heparin-immobilized copolymers of l-lactide (LA) and 5-methyl-5-benzyloxycarbonate-1,3-dioxan-2-one (MBC) as non-inflammatory and non-thrombogenic biodegradable coating materials. These copolymers were used in fabricating arsenic trioxide (As2O3)-eluting stents to reduce the late-stage adverse events, such as thrombosis, localized hypersensitivity and inflammation, that occur when applying stents to treat coronary artery diseases. Heparinized copolymers effectively reduced platelet adhesion and protein adsorption while increasing the plasma recalcification time and thromboplastin time in vitro. Histological analysis of the polymer-coated stents in a porcine coronary artery injury model indicated that one heparinized copolymer (Hep-Co90, LA:MBC = 90:10), with the highest LA content of 90% and the lowest degradation rate, induced the least foreign body reactions and inflammation, which were as small as those induced by bare metal stents. Consequently, Hep-Co90 was used as the stent coating material for local As2O3 delivery. Histomorphometric evaluations suggested no significant difference between bare metal stents and As2O3-eluting stents at 1 and 3 months post-implantation. At 6 months, the lumen area in the porcine coronary arteries treated with As2O3-eluting stents is 32.4% higher than those treated with bare metal stents while the neointimal area, neointimal thickness and stenosis rate decreased by 25.8%, 32.5% and 31.2%, respectively. The As2O3-eluting stent using Hep-Co90 as the drug carrier and stent coating material presented in this study represents a novel promising device in preventing in-stent restenosis. © 2009 Acta Materialia Inc.

Kang H.,Key Laboratory for Ultrafine Materials | Zhu Y.,Key Laboratory for Ultrafine Materials | Yang X.,Key Laboratory for Ultrafine Materials | Jing Y.,Key Laboratory for Ultrafine Materials | And 2 more authors.
Journal of Colloid and Interface Science | Year: 2010

Mesoporous silica nanofibers and Ag-doped composite nanoribbons were synthesized by a facile combination of an electrospinning technique and the sol-gel method. Tetraethyl orthosilicate, polyvinylpyrrolidone (PVP), triblock poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene oxide), copolymer Pluronic P123, and silver nitrate (AgNO3) were the components of sol for the production of Ag-doped hybrid silica ribbons. Heat removal of structure-directing agent P123 in the hybrid fibers at high temperatures resulted in a mesoporous morphology, and the degradation of PVP caused AgNO3 to convert into silver in the form of nanoparticles. The size and content of the particles in the hybrid ribbons could be controlled by the concentration of AgNO3 and thermal treatment conditions. Scanning electron microscopy, N2 adsorption-desorption isotherm, transmission electron microscopy, X-ray diffraction, and UV-Vis spectroscopy were used to characterize the composite ribbons. The catalytic activity of the ribbons was evaluated by reduction of methylene blue dye and found to be better than in previous studies. © 2009 Elsevier Inc. All rights reserved.

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