CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology

Shanghai, China

CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology

Shanghai, China
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Fang D.Q.,CAS Shanghai Institute of Applied Physics | Fang D.Q.,CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology | Fang D.Q.,CAS Institute of Theoretical Physics | Ma Y.G.,CAS Shanghai Institute of Applied Physics | And 4 more authors.
Physical Review C - Nuclear Physics | Year: 2014

The shear viscosity of hot nuclear matter is investigated by using the mean free path method within the framework of the isospin-dependent quantum molecular dynamics model. Finite size nuclear sources at different density and temperature are initialized based on the Fermi-Dirac distribution. The results show that shear viscosity to entropy density ratio decreases with the increase of temperature and tends toward a constant value for ρ∼ρ0, which is consistent with the previous studies on nuclear matter formed during heavy-ion collisions. At ρ∼12ρ0, a minimum of η/s is seen at around T=10 MeV and a maximum of the multiplicity of intermediate mass fragment (MIMF) is also observed at the same temperature which is an indication of the liquid-gas phase transition. © 2014 American Physical Society.


Xu C.,Tsinghua University | Su J.,CAS Shanghai Institute of Applied Physics | Su J.,CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology | Xu X.,Tsinghua University | And 2 more authors.
Science China Chemistry | Year: 2013

Understanding of the bonding nature of uranyl and various ligands is the key for designing robust sequestering agents for uranium extraction from seawater. In this paper thermodynamic properties related to the complexation reaction of uranyl(VI) in aqueous solution (i.e. existing in the form of UO 2(H2O)5 2+) by several typical ligands (L) including acetate (CH3CO2 -), bicarbonate (HOCO2 -), carbonate (CO3 2-), CH3(NH2)CNO- (acetamidoximate, AO-) and glutarimidedioximate (denoted as GDO2-) have been investigated by using relativistic density functional theory (DFT). The geometries, vibrational frequencies, natural net charges, and bond orders of the formed uranyl-L complexes in aqueous solution are studied. Based on the DFT analysis we show that the binding interaction between uranyl and amidoximate ligand is the strongest among the selected complexes. The thermodynamics of the complexation reaction are examined, and the calculated results show that complexation of uranyl with amidoximate ligands is most preferred thermodynamically. Besides, reaction paths of the substitution complexation of solvated uranyl by acetate and AO- have been studied, respectively. We have obtained two minima along the reaction path of solvated uranyl with acetate, the monodentate-acetate complex and the bidentate-acetate one, while only one minimum involving monodentate-AO complex has been located for AO - ligand. Comparing the energy barriers of the two reaction paths, we find that complexation of uranyl with AO- is more difficult in kinetics, though it is more preferable in thermodynamics. These results show that theoretical studies can help to select efficient ligands with fine-tuned thermodynamic and kinetic properties for binding uranyl in seawater. © 2013 Science China Press and Springer-Verlag Berlin Heidelberg.


He X.,CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology | He X.,Shandong University | Song J.,CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology | Xia H.,CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology | And 11 more authors.
Carbon | Year: 2014

Isotropic pyrolytic carbon (IPyC) prepared at 1300 C by chemical vapor deposition was implanted with 129Xe26+ ions to obtain a wide range of information and understanding about the coating materials in nuclear energy field. Microstructure of the pristine and ion-implanted IPyC on nuclear graphite substrate was firstly investigated using polarized light microscopy, scanning and transmission electron microscopy, X-ray diffraction, Raman spectroscopy, nanoindentation, and X-ray photoemission spectroscopy. It was demonstrated that the Xe ion irradiation resulted in concurrent changes in both physical and chemical structures of our standard polycrystalline sample. Influences of the thermal annealing temperature on the properties of the implanted IPyC at 500 and 1000 C were also studied. Ion-irradiation gave rise to the formation of structural deterioration along a and c axis, accompanying with the appearance of widespread clastic morphology among the irradiated zone of IPyC. There was a dose window that could be used to tune the mechanical properties of IPyC: the nanohardness and Young's modulus increased after an irradiation, but decreased as the amorphization was reached. © 2013 Elsevier Ltd. All rights reserved.


Wang C.,Chinese Academy of Sciences | Zhang W.,Chinese Academy of Sciences | Ren C.,Chinese Academy of Sciences | Huai P.,CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology | Zhu Z.,Chinese Academy of Sciences
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms | Year: 2014

Molecular dynamics (MD) simulations have been used to study the influence of temperature on defect generation and evolution in nickel and Ni-Fe alloy (with 15% and 50% Fe content) with a 10-keV primary knock-on atom (PKA) at six different temperatures from 0 to 1500 K. The recently available Ni-Fe potential is used with its repulsive part modified by Vörtler. The temporal evolution and temperature dependence of stable defect formation and in-cascade clustering processes are analysed. The number of stable defect and the interstitial clustering fraction are found to increase with temperature whereas the vacancy clustering fraction decreases with temperature. The alloy composition dependence of the stable defect number is also found for the PKA energy considered here. Additionally, a study of the temperature influence on the cluster size distribution is performed, revealing a systematic change in the cluster size distributions, with higher temperature cascades producing larger interstitial clusters. © 2014 Elsevier B.V. All rights reserved.


Yang J.,CAS Shanghai Institute of Applied Physics | Yan L.,CAS Shanghai Institute of Applied Physics | Yan L.,CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology | Huai P.,CAS Shanghai Institute of Applied Physics | Huai P.,CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology
He Jishu/Nuclear Techniques | Year: 2014

Background: C/C composites are an attractive choice for components in nuclear reactors because of their excellent performance in high temperature resistance, corrosion resistance and radiation resistance. However, to the best of our knowledge, the radiation research on their morphology and microstructure are scant. Purpose: The aim is to investigate the morphology and microstructure of C/C composites induced by irradiation. Methods: The C/C composites were irradiated with 0.5 MeV and 1 MeV Ar ions at room temperature. The samples prepared before and after irradiation have been characterized by Raman spectroscopy and scanning electron microscope (SEM). Results: With the increment of irradiation dose, the surface defects in the irradiated samples greatly increase. Moreover, some cracks and holes are found in the matrix surfaces, and the largest ones are even up to the size of one micrometer. Conclusion: The surface defects in the matrix caused by 0.5 MeV Ar ion with dose of 2.4×1016 ions·cm-2 are much more than those by 1 MeV Ar ion with dose of 3×1016 ions·cm-2.


Liu H.,CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology | Lv M.,CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology | Deng B.,University of British Columbia | Li J.,CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology | And 3 more authors.
Scientific Reports | Year: 2014

To improve the laundering durability of the silver functionalized antibacterial cotton fabrics, a radiation-induced coincident reduction and graft polymerization is reported herein where a pomegranate-shaped silver nanoparticle aggregations up to 500 nm can be formed due to the coordination forces between amino group and silver and the wrapping procedure originated from the coincident growth of the silver nanoparticles and polymer graft chains. This pomegranate-shaped silver NPAs functionalized cotton fabric exhibits outstanding antibacterial activities and also excellent laundering durability, where it can inactivate higher than 90% of both E. coli and S. aureus even after 50 accelerated laundering cycles, which is equivalent to 250 commercial or domestic laundering cycles.


Zhang B.,CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology | Liu L.,CAS Institute of Process Engineering | Liu L.,University of Chinese Academy of Sciences | Xie S.,CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology | And 10 more authors.
RSC Advances | Year: 2014

Superhydrophobic porous composite membranes are successfully prepared by using poly(vinyl acetate) functionalized multi-walled carbon nanotubes and tested for water desalination under a direct contact membrane distillation (DCMD) method. The permeate flux of the composite membranes remains greater than 20 kg m-2 h-1 and the salt rejection greater than 99.5% when tested with 3.5% NaCl solution at 70 °C. The water contact angle of the composite membranes remains greater than 150° after DCMD testing for 2 hours. © 2014 the Partner Organisations.


Tang Z.,CAS Shanghai Institute of Applied Physics | Tang Z.,CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology | Cheng G.,Anhui University of Science and Technology | Chen Y.,Guangxi University of Science and Technology | And 2 more authors.
Advanced Powder Technology | Year: 2014

Calcium carbonate (CaCO3) particles were modified by a direct blending method using different coupling agents. The changes in the CaCO3 particles were determined using different techniques. Compared with pristine particles, the modified CaCO3 particles show good dispersion, particularly those modified by γ-methacryloxypropyl trimethoxy silane. Results of the thermogravimetric analysis indicated that the coupling agents were adsorbed or anchored on the surface of the CaCO3 particles, thereby hindering aggregation. The formation of covalent bonds [CaOSi] or [CaOTi] was verified using Fourier transform infrared spectroscopy and X-ray diffraction. The modified CaCO3 particles showed more stable colloidal dispersion in ethyl acetate than that of pristine CaCO3 particles. Some silane or titanate coupling agents can be combined with CaCO3 by covalent bonds, thereby changing the surface properties of CaCO3 and enhancing dispersion in many organic media. The hydroxyl groups on the surface of CaCO3 particles can interact with silanol groups or titanate coupling agents forming an organic coating layer. © 2014 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.


Huang L.,Shanghai University of Engineering Science | Cao Y.,Shanghai University of Engineering Science | Zhao M.,Shanghai University of Engineering Science | Tang Z.,CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology | Sun Z.,Shanghai University of Engineering Science
Organic and Biomolecular Chemistry | Year: 2014

A series of chiral 6-membered ring N-heterocyclic carbene (NHC) precursors based on 3,4-dihydro-quinazoline were synthesized with overall yields of 54-62%. NHCs generated from these precursors show excellent asymmetric catalytic properties for borylation of α,β-unsaturated esters with enantioselectivity of up to 93% with a catalyst content of only 1 mol%. This journal is © the Partner Organisations 2014.


He Z.,CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology | Gao L.,CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology | Wang X.,CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology | Zhang B.,CAS Shanghai Key Laboratory of Nuclear Radiation and Nuclear Energy Technology | And 10 more authors.
Carbon | Year: 2014

The structure of molten fluoride salt infiltrated graphite has been studied by X-ray diffraction and Raman spectroscopy. The full width at half maximum and asymmetry degree of the (0 0 2) diffraction peak decrease with the increase of salt weight gain in the infiltration indicates the improvement of the stacking order of the graphite by the molten salt infiltration. The shape of G′ resonance of Raman spectra further indicated the enhancement of the stacking order of graphite by molten salt infiltration. The shift of the (0 0 2) diffraction peak position to the higher 2θ angle and the increase of the coefficient of thermal expansion reveal that the improvement of the stacking order is resulted from the compression of the graphite matrix by the infiltrated salt network. The compressive stress induced by the salt network in the graphite matrix could reduce the d-spacing fluctuation between graphite basal planes and close the Mrozowski crack generated by the anisotropy of graphite crystal, thus increase the crystallite size along c-axis. © 2014 Elsevier Ltd. All rights reserved.

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