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Li D.,Nanjing University of Technology | Li D.,Nanjing Polytechnic Institute | Hu J.,Nanjing University of Technology | Low Z.-X.,University of Bath | And 2 more authors.
Industrial and Engineering Chemistry Research | Year: 2016

Expanded polytetrafluoroethylene (ePTFE) is one of the most common membrane materials, but the intrinsic hydrophobic nature is a major reason for deteriorating performances in water purification. In this work, the influences of atomic layer deposition (ALD) seeding and subsequent ZnO nanorod (NR) growth on the surface morphologies and water permeability of ePTFE membranes was investigated. ZnO-ALD ePTFE membrane showed an order of magnitude increase in water permeation, owing to the substantial increase in surface hydrophilicity and surface area. The best-performing ZnO NRs membrane had a pure water flux (PWF) of 1764.3 L·m-2·h-1 (compared to 153.8 L·m-2·h-1 of the pristine ePTFE membrane). Suspension filtration experiments indicate that the ZnO NRs filter showed an increase of steady-state flux of more than 5 times and an increase of 29.7% in retention compared to that of the ePTFE membrane. Significantly, the novel ZnO NR filter exhibited good photocatalytic performance as demonstrated in the degradation of methyl orange (MO) solution. Therefore, the functionalized membrane can potentially overcome the inherent limitation in the trade-off effect and imply their superiority for controlling water quality. © 2016 American Chemical Society.

Wei L.,Nanjing Polytechnic Institute | Zhang P.,Nanjing Polytechnic Institute | Liu Q.,Nanjing Polytechnic Institute | Jin L.,Nanjing Polytechnic Institute | Fang G.,Nanjing Polytechnic Institute
Mocaxue Xuebao/Tribology | Year: 2016

The effects of the working parameters and the surface topography fractal parameters on friction coefficient between the end faces were studied and analyzed by theoretical calculation and experiments for contact mechanical seals. According to friction coefficient fractal model and the mutual coupling relationship between the friction coefficient and the average temperature of the end face, the influencing factors of friction coefficient were analyzed by simulation calculation for B104a-70 mechanical seal. The results indicate that the friction coefficient increased with the increase of spring pressure, and decreased with the increase of sealed medium pressure. When the rotating speed was low, the friction coefficient increased with the increase of the rotating speed, however, the friction coefficient decreased slightly with the increase of the rotating speed after it reached a certain value. The friction coefficient increased with the increase of fractal dimension and with the decrease of characteristic length scale of the soft ring. The smoother the surface was, the bigger the increasing amplitude of friction coefficient was. A series of tests were conducted on the B104a-70 mechanical seal testing device using water (15℃) as sealed medium for validating the theoretical results under different spring pressures and sealed medium pressures as well as at various rotating speeds. The results show that the theoretical values of friction coefficient were basically consistent with those by experiments. The maximum relative error was 21.74% when both the rotating speed and sealed medium pressure were low, while the maximum relative error was as low as 5.08% when the rotating speed reached the routine operating speed of 2 900 r/min. © 2016, Science Press. All right reserved.

A new compound [C19H19N3O3F2Cl·C4H3O4·H2O] (I), (7-((7S)-7-aminospiro[2.4]heptan- 5-yl)-8-chloro-6-fluoro-1-((1R,2S)-2-fluorocyclopropyl)-4-oxo-1,4-dihydroquinoline-3-carboxylic acid fumaric acid monohydrate), was synthesized and structurally characterized by single-crystal X-ray diffraction, 1H NMR, 14C spectra and mass spectra. I crystallizes in monoclinic, space group P21/c with a = 8.495(2), b = 12.545(3), c = 11.832(3) Å, β = 103.37(1)°, V = 1226.8(5) Å3, Z = 2, Mr = 543.90, Dc = 1.472 g/cm3, F(000) = 564, μ = 0.225 mm-1, the final R = 0.0307 and wR = 0.0892 for 6886 observed reflections with I > 2σ(I). X-ray diffraction analysis reveals that the quinolinone ring is almost coplanar, and the pyrrole ring adopts an envelope form. Packing of crystal I is constructed and stabilized by the N-H⋯O, O-H⋯O and N-H⋯Cl hydrogen bonds together with C-H⋯π interations. © 2016, Fujian Institute of Research of the Structure of Matter. All rights reserved.

Cai H.,Nanjing Polytechnic Institute | Zeng M.,Nanjing Polytechnic Institute
Functional Materials | Year: 2016

This study analyzed the major injection molding process parameters that affect the impact performance of low-density polyethylene(LDPE) by orthogonal experiment method. Response surface methodology was proposed to analyze the significant influence factors, and then determined optimal parameters setting of injection molding process. The results show that melting temperature and packing time are the two significant factors influence the impact performance of plastic product. Logical process parameters combinations of melting temperature, packing time and filling time are achieved by further analysis using response surface methodology. By using the optimal parameters, the arrangement of the fillers is improved, as a result, the impact performance of the filler composite is enhanced. © 2016 - STC "Institute for Single Crystals".

Yin J.,Nanjing University | Yin J.,Nanjing Polytechnic Institute | Tao C.,Nanjing University | Cai P.,Nanjing University | Liu X.,Nanjing University
Applied Physics Letters | Year: 2015

Acoustically inhomogeneous mediums with multiple scattering are often the nightmare of photoacoustic tomography. In order to break this limitation, a photoacoustic tomography scheme combining ultrasound interferometry and time reversal is proposed to achieve images in acoustically scattering medium. An ultrasound interferometry is developed to determine the unknown Green's function of strong scattering tissue. Using the determined Greens' function, a time-reversal process is carried out to restore images behind an acoustically inhomogeneous layer from the scattering photoacoustic signals. This method effectively decreases the false contrast, noise, and position deviation of images induced by the multiple scattering. Phantom experiment is carried out to validate the method. Therefore, the proposed method could have potential value in extending the biomedical applications of photoacoustic tomography in acoustically inhomogeneous tissue. © 2015 AIP Publishing LLC.

Xu W.,Nanjing Polytechnic Institute | Xu W.,Oakland University | Feng X.,Nanjing Polytechnic Institute | Li J.,Oakland University | And 2 more authors.
Proceedings of SPIE - The International Society for Optical Engineering | Year: 2016

This investigation applied the digital image correlation technique (DIC) on a pressure vessel that contained several surface pit defects under high pressure. Data on the deformation of the defects and peripheral area is obtained by this method. The results show that the stress and strain increase with the depth among different pits and are the largest at the bottom of any given pit. This method has proven to be a good choice for this type of experiment, where elastic and plastic surface strains need to be measured. The DIC can satisfy the requirements of being in situ, in real time, full-field and make non-contact measurements with more accurate and obvious experimental results compared with traditional measurement methods and pressure vessel test regulations. Also, it is a new, effective way for monitoring defects in online pressure vessels as well as a reliable basis for pressure vessels' safety evaluation. © 2016 SPIE.

PubMed | Nanjing Polytechnic Institute
Type: Journal Article | Journal: Acta crystallographica. Section C, Structural chemistry | Year: 2016

The self-assembly of coordination polymers and the crystal engineering of metal-organic coordination frameworks have attracted great interest, but it is still a challenge to predict and control the compositions and structures of the complexes. Employing multidentate organic ligands and suitable metal ions to construct inorganic-organic hybrid materials through metal-ligand coordination and hydrogen-bonding interactions has become a major strategy. Recently, imidazole-containing multidentate ligands that contain an aromatic core have received much attention. A new three-dimensional Mn

PubMed | Changchun University of Technology, Nanjing Polytechnic Institute and Jilin University
Type: | Journal: Journal of pharmaceutical and biomedical analysis | Year: 2016

The microwave-assisted ionic liquid homogeneous liquid-liquid microextraction (MA-IL-HLLME) coupled with high performance liquid chromatography with diode array detection (HPLC-DAD) was developed for the determination of anthraquinones, including aloe-emodin, emodin, chrysophanol and physcion in root of Rheum palmatum L. Several experimental parameters influencing the extraction efficiency, including amount of sample, type and volume of ionic liquid, volume and pH value of extraction medium, microwave power and extraction time, concentration of NH4PF6 as well as centrifugal condition were optimized. When 140L of ionic liquid ([C8MIM][BF4]) was used as an extraction solvent, target analytes can be extracted from sample matrix in one minute with the help of microwave irradiation. The MA-IL-HLLME is simple and quick. The calibration curves exhibited good linear relationship (r>0.9984). The limits of detection and quantification were in the range of 0.015-0.026 and 0.051-0.088gmL(-1), respectively. The spiked recovery for each analyte was in the range of 81.13-93.07% with relative standard deviations lower than 6.89%. The present method is free of volatile organic solvents, and represents lower expenditures of sample, extraction time and solvent, compared with ultrasonic and heat reflux extraction. The results indicated that the present method can be successfully applied to the determination of anthraquinones in medicinal plant.

PubMed | Nanjing Polytechnic Institute
Type: Journal Article | Journal: Acta crystallographica. Section E, Crystallographic communications | Year: 2015

In the title compound, C27H21FN2O4, the mean planes of the indole ring systems (r.m.s. deviations = 0.0263 and 0.0160) are approximately perpendic-ular to one another, making a dihedral angle of 84.0(5); the fluoro-benzene ring is twisted with respect to the mean planes of the two indole ring systems at 89.5(5) and 84.6(3). In the crystal, pairs of N-HO hydrogen bonds link the mol-ecules into inversion dimers, which are further linked by N-HO hydrogen bonds into supra-molecular chains propagated along the b-axis direction. Weak C-H inter-actions are observed between neighbouring chains.

PubMed | Nanjing Polytechnic Institute, Nanyang Technological University, Nanjing University of Technology and Nanjing University
Type: Journal Article | Journal: Chemistry, an Asian journal | Year: 2016

Pi-extended polyaromatics tend to exhibit improved electronic properties with respect to the intrinsic structures. Herein, the rational design of a -extended diindole-fused diazapentacenone (IP), with a nine-ring-fused core, obtained by applying an intramolecular Friedel-Crafts diacylation synthetic routine, is reported. The chemical structure, physical properties, and morphology of IP were fully characterized. Serving as an organic cathode material for a lithium-ion battery, the as-prepared nanorods of -extended IP display higher conductivity and superior electrochemical performance than those of the naked diazapentacenone without diindole fusion.

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