JOURNAL OF CHEMICAL AND ENGINEERING DATA
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2015
·
IF 2.037
Fang Zhang,Yaocun Tang,Long Wang,Li Xu,Guoji Liu
The solubility of 2-methylnaphthalene in different organic solvents was experimentally studied by the equilibrium method at temperatures from (278.15 to 303.15) K under atmospheric pressure. The solubility of 2-methylnaphthalene in all solvents increased with the increasing temperature. The solubility data were correlated with four thermodynamic models including the van’t Hoff equation, modified Apelblat equation, λh equation, and Wilson model. It was found that the calculated solubility with modified Apelblat equation provided a good agreement with the experimental values for the solubility behavior of 2-methylnaphthalene. The thermodynamic properties of the standard dissolution enthalpy, standard entropy, and the standard mole Gibbs free energy were evaluated based on the van’t Hoff analysis. The values of enthalpy of dissolution are positive, which indicate that the dissolution process of 2-methylnaphthalene in different organic solvents is endothermic.
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Chemistry-An Asian Journal
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2015
·Vol. 10
·期 5
·1177-1183
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IF 4.587
Shuai Zhao,Haining Wang,Lanxia Xin,Jian Cui,Yehai Yan
Graphical Easy as 2, 3, 4 : 2-(3,4-Dihydroxyphenyl) pyrrolidine grafted graphene was developed as a competent platform for covalent functionalization of graphene, from which four typical but not exclusive graphene-derived materials of magnetic graphene-FeCl 3 complex, phenolic-, epoxide-, and methacryloyl-functionalized graphenes were successfully prepared. Covalent functionalization has proven an effective solution for graphene to realize its revolutionary potential in real applications, whereas the platform strategy (a reactive graphene-based material acting as the platform to undergo post-reactions for generation of various graphene-derived materials) is an attractive option to execute efficiently such a task. This contribution demonstrates that 2-(3,4-dihydroxyphenyl) pyrrolidine (DHPP) grafted graphene, G-OH, is a competent platform. Four typical but not exclusive graphene-derived materials have been prepared from G-OH by using the chemical virtue of each DHPP unit having three categories totaling six reactive sites. The controlled feature of 1,3-dipolar cycloaddition for the synthesis of G-OH ensures that the electronic structure and properties of pristine graphene are succeeded largely by G-OH and thus its derivatives. A promising alternative to graphene oxide, which has been widely used as a platform to prepare the graphene-derived materials but suffers from some intrinsic disadvantages, is thus developed.
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
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2014
·Vol. 19
·期 1
·229-239
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IF 2.234
Zhang J. L.,Liu H. D.,Huang L. H.,Tan S. Z.,Mai W. J.,Cai X.
An advanced electrochemical pseudocapacitor material based on reduced graphene oxide and nickel hydroxide (rGO&Ni(OH) 2 ) was prepared by an easy process where ammonia acted as a pre-stabilizer that could be easily removed. The results showed that the agglomeration and re-stacking of rGO could be effectively prevented, resulting in few-layer rGO nanosheet with high specific surface area of 891.22 m 2 /g which could supply large available area for loading nanoparticle. After the incorporation of Ni(OH) 2 nanoparticle, the rGO&Ni(OH) 2 composite owned excellent electrochemical performance thanks to effective prevention of agglomeration and re-stacking of rGO with large size of the sp 2 domain, no residual of pre-stabilizer of ammonia, and tight contact between rGO and Ni(OH) 2 . Specifically, the rGO&Ni(OH) 2 electrode exhibited excellent stability at scan rates from 100 to 300 mV/s. A high specific capacitance of 1,008 F/g was obtained at high current density of 42 A/g in 6 mol/L KOH aqueous electrolyte, and the specific capacitance demonstrated good rate capability. Moreover, rGO&Ni(OH) 2 electrode showed a long cycle life, retaining 74 % specific capacitance after 2,000 cycles at current density of 6 A/g. The advantages of easy process and excellent electrochemical property suggested great potential application of rGO&Ni(OH) 2 in supercapacitors.
An advanced electrochemical pseudocapacitor material based on reduced graphene oxide and nickel hydroxide was prepared by an easy process where ammonia acted as a pre-stabilizer that could be easily removed. The obtained material owned excellent electrochemical property, including high capacitance, good rate capability, excellent stability, long cycle life, etc.
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BIOSENSORS & BIOELECTRONICS
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2014
·
IF 6.451
Jia-Cheng Wang,Yong-Sheng Wang,Jin-Hua Xue,Bin Zhou,Qiu-Mei Qian,Yong-Song Wang,Ji-Cheng Yin,Hui Zhao,Hui Liu,Shan-Du Liu
We developed a highly sensitive label-free assay of 8-hydroxy-2′-deoxyguanosine (8-OHdG) using 8-OHdG-aptamer (Apt) as the recognition element. The Apt was adsorbed onto the surface of gold nanoparticles (AuNPs), which prevents them from aggregating under high-salt conditions. Upon addition of 8-OHdG, the conformation of the Apt changes to form a G-quadruplex structure, which leads to the aggregation of the AuNPs along with the increase of the resonance light scattering intensity. The mechanism of 8-OHdG that induces Apt to form G-quadruplexes structure was studied by circular dichroism . The response signals linearly correlated with the concentration of 8-OHdG ranging from 90.8 pM to 14.1 nM with a detection limit of 27.3 pM, which is much lower than that obtained by other methods. This method does not need any label steps and sophisticated equipment. The application for detection of 8-OHdG in real samples further demonstrated its reliability. This strategy would be helpful for developing a universal analytical method by simply replacing corresponding aptamers for various target molecules.
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POLYHEDRON
·
2015
·
IF 2.011
Kui Ren,Xuefang Shang,Jiajia Fu,Peipei Zhao,Jinlian Zhang
A Copper(II) complex of condensation production was synthesized and its crystal was also obtained by the reaction of 2-(phenylimino-methyl)-phenol with Cu(CH 3 COO) 2 ·H 2 O. The crystal and molecular structure of the complex was determined by single-crystal X-ray diffraction, IR, and HRMS. The Cu(II) ion was four coordinated with two phenolate oxygen and two imine nitrogen atoms in a square-planar geometry. It should be emphasized that the complex demonstrated high selectivity and sensitivity for hydrogen sulfide over other anions (AcO − , H 2 PO 4 − , F − , Cl − , Br − and I − ) followed by the release of copper ion to give a remarkable increase of fluorescence intensity in various organic-aqueous solutions. The synthesized copper complex could be used as a fluoresencent probe for the detection of HS − in the sample of environment, pharmacy, and etc.
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FLUID PHASE EQUILIBRIA
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2015
·
IF 2.2
Fang Zhang,Long Wang,Yaocun Tang,Xiaoqiang Gao,Li Xu,Guoji Liu
The solid–liquid equilibrium or the ternary system of 2-methyl-1,4-naphthoquinone + phthalic anhydride + acetone were determined at three temperatures of (283.15, 293.15 and 303.15) K, respectively. Three isothermal phase diagrams of the system were constructed on the basis of the measured solubility. Two pure solid phases were formed at (283.15, 293.15 and 303.15) K, including pure PA and pure 2-MNQ, which were confirmed and determined by the method of Schreine makers' wet residue. The densities of equilibrium liquid phase were determined experimentally at the corresponding temperatures versus mass fraction of component. The phase diagram at 283.15 K is similar to those at (293.15 and 303.15) K and the crystalline fields of 2-MNQ and PA decrease with an increase in temperature. The ternary diagram can provide the fundamental basis for separation of 2-MNQ and PA.
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JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2015
·
IF 2.947
Xiaoyan Shu,Long Fan,Xirui Lu,Yi Xie,Yi Ding
A series of pyrochlore structure oxides (Gd 1− x Nd x ) 2 (Zr 1− y Ce y ) 2 O 7 (0 ≤ x , y ≤ 1.0) were fabricated and investigated. The end member of A-site substitution (Nd 2 Zr 2 O 7 ) maintains the original pyrochlore phase, while the ultimate compositions of B-site and simultaneous substitution have transformed to a single defect fluorite structure from the XRD results. The Raman spectra reveal the local coordination changes resulting from exotic-atom substitutions, especially from the B-site substitution. The microtopography and element distribution of the ultimate composition Nd 2 Ce 2 O 7 in the discussed system are characterized through SEM and TEM. The density and Vickers hardness of the compounds are provided for the basic mechanical performance evaluation.
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JOURNAL OF APPLIED POLYMER SCIENCE
·
2014
·Vol. 131
·期 17
·
IF 1.64
Hongming Yuan,Zaochuan Ge,Shaojun Chen,Shiguo Chen,Haipeng Yang,Haitao Zhuo
This article demonstrates a comparative investigation about the effect of diisocyanate on pyridine containing shape memory polyurethanes (Py-SMPUs), which are synthesized with N , N -bis(2-hydroxylethyl)isonicotinamide (BINA) and four different diisocyanates: 1,6-hexanediisocyante (HDI), isophorone diisocyanate (IPDI), methylene diphenyl diisocyanate (MDI), and tolylene diisocyanate (TDI). Results show that all BINA–SMPU systems have amorphous reversible phase. Comparatively, the MDI–BINA and TDI–BINA systems show higher T g ; and the HDI–BINA and IPDI–BINA systems show better thermal stability. In addition, the HDI–BINA and the IPDI–BINA systems exhibit good thermal-induced shape memory effect and good moisture-sensitive shape memory effect due to their better moisture absorption properties. Particularly, the HDI–BINA system has better response speed and better shape recovery. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2014 , 131 , 40721.
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JOURNAL OF HAZARDOUS MATERIALS
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2014
·
IF 4.331
Zhixing He,Chengzhen Niu,Zhenmei Lu
The bacterial strain DP-2, identified as Rhodococcus ruber , is able to effectively degrade di-n-butyl phthalate (DBP) and phenol. Degradation kinetics of DBP and phenol at different initial concentrations revealed DBP and phenol degradation to fit modified first-order models. The half-life of DBP degradation ranged from 15.81 to 27.75 h and phenol degradation from 14.52 to 45.52 h under the initial concentrations of 600–1200 mg/L. When strain DP-2 was cultured with a mixture of DBP (800 mg/L) and phenol (700 mg/L), DBP degradation rate was found to be only slightly influenced; however, phthalic acid (PA) accumulated, and phenol degradation was clearly inhibited during synchronous degradation. Transcriptional levels of degradation genes, phenol hydroxylase ( pheu ) and phthalate 3,4-dioxygenase ( pht ), decreased significantly more during synchronous degradation than during individual degradation. Quantitative estimation of individual or synchronous degradation kinetics is essential to manage mixed hazardous compounds through biodegradation in industrial waste disposal.
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JOURNAL OF MEMBRANE SCIENCE
·
2013
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IF 4.093
Li-Jing Zhu,Li-Ping Zhu,Jin-Hong Jiang,Zhuan Yi,Yi-Fan Zhao,Bao-Ku Zhu,You-Yi Xu
Here we report the preparation and properties of polyethersulfone (PES) ultrafiltration (UF) membranes with poly( 2 -hydroxyethyl methacrylate) (PHEMA) grafted silica (SiO 2 ) nanoparticles (PHEMA@SiO 2 NPs) as the blending additive. The PHEMA@SiO 2 NPs were first prepared by grafting PHEMA brushes onto SiO 2 NPs via a surface-initiated reversible addition fragmentation chain transfer (RAFT) polymerization. The organic–inorganic hybrid membranes of PES with PHEMA@SiO 2 NPs were fabricated via the traditional non-solvent induced phase separation (NIPS) process. During membrane formation, the hydrophilic PHEMA@SiO 2 NPs tended to migrate toward the membrane top surfaces. The membrane surface porosities were increased and the surface hydrophilicity was enhanced after introducing PHEMA@SiO 2 NPs. More importantly, the water permeability, solute rejection and anti-fouling ability of PES membranes were improved significantly. This phenomenon indicated that the trade-off between permeability and selectivity of PES UF membranes was broken by the incorporation of PHEMA@SiO 2 NPs. Different from traditional neat inorganic NPs additive, the PHEMA@SiO 2 organic–inorganic NPs could be held in/on PES membrane for a long period of time due to the intertwisting of polymer chains. The present work provides a simple approach for stable and nearly permanent hydrophilization of PES UF membranes, which can also be extended to more membrane materials prepared by NIPS process.
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Chemistry-An Asian Journal
·
2013
·Vol. 8
·期 7
·1504-1513
·
IF 4.572
Si-Hai Wu,Yu-Wu Zhong,Jiannian Yao
Graphical NN-CNN breaking news : 2,3-Di(2-pyridyl)-5-phenylpyrazine, which is able to bind two metals through a NN-CNN-type coordination mode, has been designed and synthesized. A RuPt heterobimetallic complex with this bridging ligand shows near-infrared emission at 750 nm, with a quantum yield of 0.41 % and an excited-state lifetime of 170 ns. en This link goes to a English section zh This link goes to a English section A new bridging ligand, 2,3-di(2-pyridyl)-5-phenylpyrazine (dpppzH), has been synthesized. This ligand was designed so that it could bind two metals through a NN-CNN-type coordination mode. The reaction of dpppzH with cis -[(bpy) 2 RuCl 2 ] (bpy=2,2′-bipyridine) affords monoruthenium complex [(bpy) 2 Ru(dpppzH)] 2+ ( 12+ ) in 64 % yield, in which dpppzH behaves as a NN bidentate ligand. The asymmetric biruthenium complex [(bpy) 2 Ru(dpppz)Ru(Mebip)] 3+ ( 23+ ) was prepared from complex 12+ and [(Mebip)RuCl 3 ] (Mebip=bis( N -methylbenzimidazolyl)pyridine), in which one hydrogen atom on the phenyl ring of dpppzH is lost and the bridging ligand binds to the second ruthenium atom in a CNN tridentate fashion. In addition, the RuPt heterobimetallic complex [(bpy) 2 Ru(dpppz)Pt(CCPh)] 2+ ( 42+ ) has been prepared from complex 12+ , in which the bridging ligand binds to the platinum atom through a CNN binding mode. The electronic properties of these complexes have been probed by using electrochemical and spectroscopic techniques and studied by theoretical calculations. Complex 12+ is emissive at room temperature, with an emission λ max =695 nm. No emission was detected for complex 23+ at room temperature in MeCN, whereas complex 42+ displayed an emission at about 750 nm. The emission properties of these complexes are compared to those of previously reported Ru and RuPt bimetallic complexes with a related ligand, 2,3-di(2-pyridyl)-5,6-diphenylpyrazine. en This link goes to a English section zh This link goes to a English section 1
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EUROPEAN JOURNAL OF INORGANIC CHEMISTRY
·
2015
·Vol. 2015
·期 28
·4708-4714
·
IF 2.942
Xiao-Qing Huang,Hao Yang,Shun-Ping Zhao,Jian-Lan Liu,Xiao-Ming Ren
Graphical An anhydrous proton conductor is achieved by inserting 2-picolinic acid into the layer space of kaolinite, and the proton transport in this intercalated hybrid material is mainly through the vehicle mechanism owing to the absence of a dense H-bond network. Kaolinite intercalated with 2-picolinic acid was prepared and characterized by scanning electron microscopy, powder X-ray diffraction, infrared spectroscopy, and thermogravimetric analysis. The proton conductivity ( σ ) of the material is 1.85 × 10 –10 S cm –1 at 353 K and gradually increases to 1.7 × 10 –7 S cm –1 at 393 K under N 2 (anhydrous environment) with an activation energy of E a = 1.93 eV, whereas σ = 1.56 × 10 –7 S cm –1 under 80 % relative humidity at 353 K with E a = 0.91 eV. The crystal structure optimized with the Cambridge Sequential Total Energy Package discloses the absence of a dense H-bond network in the layer space of kaolinite, which explains the low proton conductivity and high proton transfer activation energy of the intercalated proton conductor.
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