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Chen S.,Central South University | Hou P.,Central South University | Zhou B.,CAS Technical Institute of Physics and Chemistry | Song X.,Central South University | And 5 more authors.
RSC Advances | Year: 2013

A novel red (λmaxem = 632 nm) fluorescent probe based on 3-hydroxyflavone was designed and synthesized for thiol recognition with high sensitivity and excellent selectivity. Application of the probe for selective detection of intracellular thiols has been successfully demonstrated. © The Royal Society of Chemistry 2013.


Chen S.,Central South University | Chen S.,Key Laboratory of Resource Chemistry of Nonferrous Metals | Hou P.,Central South University | Hou P.,Key Laboratory of Resource Chemistry of Nonferrous Metals | And 5 more authors.
RSC Advances | Year: 2012

The levulinate ester of 2-(benzothiazol-2-yl)phenol, 1, has been developed as a ratiometric fluorescent probe for identifying and quantitating sulfite anions. The mechanism of action is based on the sulfite-triggered intramolecular cleavage of the levulinate moiety to give 1 which, when excited with 310 nm light, decays to its ground state via an excited state intramolecular proton transfer (ESIPT) mediated pathway. We show that the intensity of the ESIPT fluorescent signal relative to that of 1 is proportional to sulfite concentration. This new probe shows good selectivity and high sensitivity for sulfite over other typically encountered anions (F-, Cl-, Br-, I-, HPO4 2-, SO4 2-, NO3 -, AcO-, ClO4 -, N3 -, HCO3 -) when measured in CH3CN/H2O (50:50, v/v) solution. © 2012 The Royal Society of Chemistry.


Hou P.,Central South University | Chen S.,Central South University | Voitchovsky K.,Central South University | Song X.,Central South University | And 2 more authors.
Luminescence | Year: 2014

A colorimetric and ratiometric fluorescent sulfite probe, the levulinate of 4-hydroxynaphthalimide, was successfully synthesized from 4-hydroxy-naphthalimide and levulinic acid. Through sul fite-mediated intramolecular cleavage, the probe was converted into 4-hydroxynaphthalimide, which when excited at 450 nm, displayed a large Stokes shift due to the intramolecular charge transfer process. The probe exhibited high selectivity and sensitivity towards sulfite over other typical anionic species (F-, Cl-, Br-, I-,HPO4 2-,SO4 2-, NO3 -, AcO-,ClO4 -,HCO3 -) in HEPES-buffered solution (25 mM, pH 7.4, 50% acetonitrile, v/v). Copyright © 2013 John Wiley & Sons, Ltd.


Hou P.,Central South University | Chen S.,Central South University | Song X.,Central South University | Song X.,Key Laboratory of Resource Chemistry of Nonferrous Metals | Song X.,State Key Laboratory for Powder Metallurgy
Luminescence | Year: 2014

A colorimetric and turn-on fluorescent probe for fluoride ions, tert-butyldimethylsilane 6-acetyl-2-naphtholate, was readily synthesized from 6-acetyl-2-naphthol and tert-butyldimethylchlorosilane (TBSCl). The probe exhibits high sensitivity and good selectivity for fluoride ions in acetonitrile. The inherent mechanism involves the cleavage of the Si-O bond in the probe, which induced yellow color formation and prominent fluorescence enhancement. Copyright © 2013 John Wiley & Sons, Ltd.


Hou P.,Central South University | Chen S.,Central South University | Wang H.,Central South University | Wang J.,Central South University | And 4 more authors.
Chemical Communications | Year: 2014

A novel red emitting fluorescent probe exhibiting a 143 nm Stokes shift for the detection of fluoride ions in an aqueous solution was developed. The probe displays a rapid response, high selectivity and good sensitivity towards F -. Application of the probe for the selective detection of intracellular F- has been successfully demonstrated in living cells. © 2013 The Royal Society of Chemistry.


Zhou H.,Central South University | Zhou H.,State Key Laboratory for Powder Metallurgy | Yi D.,Central South University | Li D.,Beijing Institute of Technology | And 2 more authors.
Fenmo Yejin Jishu/Powder Metallurgy Technology | Year: 2010

MoSi2 composites with different Si3N4(p) and SiC(w) volume contents were prepared by hot pressing process. The structure, morphology, hardness, fracture toughness, bending strength, strengthening and toughening mechanism of the MoSi2-Si3N4(p)/SiC(w) composites were investigated by means of X-ray diffraction (XRD), Scanning electron microscope (SEM), Vichers hardness tester, and electronic universal material tester. It is shown that mechanical properties of the prepared composites are much higher than that of MoSi2, there is no new phase generated between strengthening phase and MoSi2. SiC whiskers and Si3N4 particles have good strengthening and toughening effect on MoSi2, MoSi2-20vol% Si3N4(p)-20vol%SiC(w) composite has the highest bending strength and room fracture toughness, which is 427 MPa and 10.4 MPa·m1/2, respectively. The strengthening mechanism of MoSi2-Si3N4(p)/SiC(w) composites are the fine grains and dispersion strengthening, and the toughening mechanism are the fine grain toughening and the crack deflection toughening.


Zhang X.D.,Central South University | Liu L.B.,Central South University | Liu L.B.,State Key Laboratory for Powder Metallurgy | Zhao J.-C.,State Key Laboratory for Powder Metallurgy | And 4 more authors.
Materials Science and Engineering C | Year: 2014

A high-efficiency combinatorial approach has been applied to rapidly build the database of composition-dependent elastic modulus and hardness of the Ti-Ta and Ti-Zr-Ta systems. A diffusion multiple of the Ti-Zr-Ta system was manufactured, then annealed at 1173 K for 1800 h, and water quenched to room temperature. Extensive interdiffusion among Ti, Zr and Ta has taken place. Combining nanoindentation and electron probe micro-analysis (EPMA), the elastic modulus, hardness as well as composition across the diffusion multiple were determined. The composition/elastic modulus/hardness relationship of the Ti-Ta and Ti-Zr-Ta alloys has been obtained. It was found that the elastic modulus and hardness depend strongly on the Ta and Zr content. The result can be used to accelerate the discovery/development of bio-titanium alloys for different components in implant prosthesis. © 2014 Elsevier B.V.

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