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ABSTRACT: In this work, nanostructured copper oxide of varied morphologies and high surface area were prepared by calcination of copper oxalate precursors, and were characterized by X-ray diffraction, scanning electron microscopy, transmission electron microscopy, thermogravimetric analysis and differential thermal analysis, and nitrogen adsorption-desorption measurements. The sphere-like CuO (specific surface area: 73 m(2) g(-1)) functionalized QCM resonators were fabricated and explored for HCN sensing. The sensitivity (10 s HCN exposure) of sphere-like CuO functionalized QCM resonators reached as high as 6.53 Hz μg(-1). The reproducibility and stability of sphere-like CuO functionalized QCM resonators was excellent, and the selectivity was very high with a converse response to examined common chemicals. The high surface area CuO functionalized QCM sensors may be applicable for HCN gas sensing.
The Analyst 01/2013; · 4.23 Impact Factor
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ABSTRACT: A new coordination compound [Zn(CHZ)3][C(NO2)3]2·(H2O)2 was synthesized and characterized by elemental analysis, FTIR and UV spectra, and its crystal structure was determined by
X-ray single crystal diffraction. The crystal belongs to the triclinic system, space group
P[`1] P\overline{1} . In the asymmetric unit, zinc (II) ion is six-coordinated with three carbonyl oxygen atoms and three terminal nitrogen atoms
to form distorted octahedral structure, three CHZ molecules and central metal cation constitute three planar chelate rings
which are vertical one to another, and two trinitromethanides are similar to the conformation of C
2v
-like. Zinc (II) ions, carbohydrazide ligand molecules, trinitromethanide anions, and lattice water molecules are jointed
to a complicated three-dimensional network structure through coordination bonds, electrostatic forces, and extensive hydrogen
bonds. The thermal decomposition character and mechanism were tested through DSC, TG–DTG, and FTIR spectra. The results show
that the title complex has high energy and good thermal stability.
Structural Chemistry 05/2012; 19(2):321-328. · 1.85 Impact Factor
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ABSTRACT: In this work, quartz crystal microbalance (QCM) sensors for detection of trace hydrogen cyanide (HCN) gas were developed based on nanostructural (flower-like, boat-like, ellipsoid-like, plate-like) CuO. Responses of all the sensors to HCN were found to be in an opposite direction as compared with other common volatile substances, offering excellent selectivity for HCN detection. The sensitivity of these sensors is dependent on the morphology of CuO nanostructures, among which the plate-like CuO has the highest sensitivity (2.26 Hz/μg). Comparison of the specific surface areas of CuO nanostructures shows that CuO of higher surface area (9.3 m(2)/g) is more sensitive than that of lower surface area (1.5 m(2)/g), indicating that the specific surface area of these CuO nanostructures plays an important role in the sensitivity of related sensors. On the basis of experimental results, a sensing mechanism was proposed in which a surface redox reaction occurs between CuO and Cu(2)O on the CuO nanostructures reversibly upon contact with HCN and air, respectively. The CuO-functionalized QCM sensors are considered to be a promising candidate for trace HCN gas detection in practical applications.
Environmental Science & Technology 06/2011; 45(14):6088-94. · 4.80 Impact Factor
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ABSTRACT: To observe the effect of minimally invasive removal of intracranial hematoma in basal ganglia on cortical spinal tract (CST).
Twenty-seven patients with intracerebral hemorrhage (ICH) in basal ganglia were selected and divided into a minimally invasive treatment group (13 patients) and a medical treatment group (14 patients) randomly: the volume of hematoma was 30-50 ml, with an average of 39.20 ± 4.85 ml in minimally invasive group and 38.70 ± 6.33 ml in medical treatment group. All patients underwent the whole brain diffusion tensor imaging (DTI) in 1 week after onset; fractional anistropy (FA) values of CST in internal capsule and cerebral peduncle ipsilateral and contralateral to the hematoma side in minimally invasive group were determined and then compared with those in medical treatment group.
The minimally invasive treatment group showed that FA values of CST in internal capsule and cerebral peduncle on the affected side were 0.524 ± 0.045 and 0.534 ± 0.020, respectively, and in medical treatment group, FA values were 0.425 ± 0.050 and 0.468 ± 0.040, respectively. FA values of internal capsule and cerebral peduncle CST in minimally invasive treatment group were significantly increased as compared with the medical treatment group, and a significant difference was noted. In minimally invasive group, we obtained pre-operative DTI in five patients; FA values of CST in internal capsule and cerebral peduncle ipsilateral to the hemorrhage side were 0.428 ± 0.032 and 0.515 ± 0.048, respectively, 1 week after the hematoma was evacuated FA values of CST in internal capsule and cerebral peduncle increased significantly. Therefore, minimally invasive surgery for evacuation of intracranial hematomas could reduce the damages to CST. At the same time, the CST which was oppressed and displaced by hematoma restored to normal position largely or completely after the minimally invasive removal of intracranial hematoma.
The changes of CST could be visualized by DTI in patients with ICH. Minimally invasive removal of intracranial hematoma could effectively reduce the injury to the CST and could restore the CST which was oppressed and displaced by the hematoma to the normal position.
Neurological Research 12/2010; 32(10):1103-9. · 1.52 Impact Factor
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ABSTRACT: A new coordination compound, [Mn(CHZ)3][C(NO2)3]2, was synthesized and characterized by elemental analysis, IR and UV spectra, and its crystal structure was determined by X-ray single crystal diffraction. The crystal belongs to the triclinic system and space group with a=0.88737(18) nm, b=1.1804(2) nm, c=1.1936(2) nm, β=83.73(3)°, V=1.1121(4) nm3, Z=2, Dc=1.867 g cm−3. Every Mn(II) ion is six-coordinated to three CHZ molecules through three carbonyl oxygen atoms and three terminal nitrogen atoms to form a distorted octahedral structure. Mn(II) ions, carbohydrazide ligand molecules, and trinitromethanide anions are jointed to a complicated three-dimensional netted structure through coordination bonds, electrostatic forces, and extensive hydrogen bonds. The thermal decomposition character and mechanism was studied by DSC, TG-DTG, and FTIR techniques. The non-isothermal kinetics has also been studied on the exothermic decomposition by using Kissinger's method and Ozawa–Doyle's method. In addition, the impact, friction, and flame sensitivity data were determined. All properties data observed show that the title complex has high energy, good thermal stability, and moderately friction sensitivity.
Propellants Explosives Pyrotechnics 01/2009; 34(1):24 - 31. · 1.10 Impact Factor
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ABSTRACT: A novel coordination compound [Zn(DAT)2(H2O)4](PA)2⋅2H2O has been synthesized using 1,5-diaminotetrazole (DAT) as ligands. It crystallizes in the monoclinic space group C2/c, with a=1.51973(19) nm, b=0.67904(9) nm, c=3.0712(4) nm, β=90.507(2)°, V=3.1692(7) nm3, Z=4, and μ=0.888 mm−1. With the intermolecular hydrogen bonds, molecules are linked together to form a three-dimensional net structure. Thermal decomposition mechanism of the title compound was predicted based on DSC, TG-DTG, and FT-IR analyses. The kinetic parameters of the first exothermic process of the title compound were studied applying the Kissinger's and Ozawa–Doyle's methods.
Propellants Explosives Pyrotechnics 11/2008; 33(6):437 - 442. · 1.10 Impact Factor
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ABSTRACT: An energetic coordination compound [Cd(DAT)(6)](ClO(4))(2) has been synthesized by using 1,5-diaminotetrazole (DAT) as ligand and its structure has been characterized by applying X-ray single crystal diffraction, elemental analysis and FT-IR spectroscopy. The central cadmium(II) cation is coordinated by six N atoms from six DAT molecules to form a six-coordinated and distorted octahedral structure. Di-dimension layer structure was formed and the layers were linked together by the extensive intermolecular hydrogen bonds between DAT ligands and ClO(4)(-) anions. Thermal decomposition mechanism of the title compound was predicted based on DSC, TG-DTG and FT-IR analyses results. The kinetic parameters of the first exothermic process of the title compound were studied by applying the Kissinger's and Ozawa-Doyle's methods. Sensitivity tests reveal that the title compound has sensitive nature.
Journal of Hazardous Materials 03/2008; 160(1):45-50. · 4.17 Impact Factor
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ABSTRACT: Two crystalline metal-organic frameworks, [Cd2(o-BTC)(H2O)2]n (1) and [Pb2(o-BTC)]n (2) (o-BTC = benzene-1,2,3,4-tetracarboxylic), were synthesized under hydrothermal conditions and characterized by analytical, spectroscopic and single crystal X-ray diffraction studies, which reveal three-dimensional reticular structures via M2+ and carboxylate ligands. All carboxyl groups of o-BTC are deprotonated, in agreement with the IR data. The Cd2+ centers of 1 have one coordination environment, while Pb2+ centers of 2 have two coordination environments. Both 1 and 2 form 3D interpenetrated grid structures along the b and c axes, respectively.
Journal of Coordination Chemistry 12/2007; 61(9):1437-1442. · 1.55 Impact Factor
