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1. chinaXiv:201705.00584 [pdf]

Synthesis and characterization of transparent polyimides derived from ester-containing dianhydrides with different electron affinities

Zhou, Y [Zhou, Yu][ 1,2 ]; Chen, GF [Chen, Guofei][ 1 ]; Wang, W [Wang, Wei][ 1 ]; Wei, LH [Wei, Lihong][ 1 ]; Zhang, QJ [Zhang, Qiuju][ 1 ]; Song, LP [Song, Liping][ 2 ]; Fang, XZ [Fang, Xingzhong][ 1 ]
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

Two series of poly(ester imide)s derived from bis(trimellitic acid anhydride) phenyl ester (TAHQ) and bis[(3,4- dicarboxylic anhydride) phenyl] terephthalate (PAHP), as well as poly(ether imide)s based on hydroquinone diphthalic anhydride (HQDPA), were synthesized with aromatic diamines via solution polycondensation. These polyimide films were transparent with an ultraviolet-visible absorption cut-off wavelength below 375 nm, and with tensile strengths of 42.0–83.8 MPa, tensile moduli of 2.5–4.7 GPa and elongations at break of 2.1–5.4%. Compared with the poly(ether imide)s, the poly(ester imide)s showed higher glass transition temperatures (Tg), lower water absorption (WA) and lower temperature of 5% weight loss (Td5%). Moreover, the poly(ester imide)s derived from PAHP with a low electron affinity of 2.04 eV by theoretical calculation achieved better transparency, lower WA and slightly lower Tg than the corresponding TAHQ- based poly(ester imide)s.

submitted time 2017-05-02 Hits1150Downloads606 Comment 0

2. chinaXiv:201705.00548 [pdf]

Fabrication of tunable 3D graphene mesh network with enhanced electrical and thermal properties for high-rate aluminum-ion battery application

Yang, GY [Yang, G. Y.][ 1,2 ]; Chen, L [Chen, L.][ 1 ]; Jiang, P [Jiang, P.][ 1 ]; Guo, ZY [Guo, Z. Y.][ 2 ]; Wang, W [Wang, W.][ 1 ]; Liu, ZP [Liu, Z. P.][ 1 ]
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

Three-dimensional (3D) graphene networks are attracting ever-increasing attention in the field of energy storage because their unique architecture at macroscopic scales is beneficial for effective electron and ion transport. Herein, a novel interconnected 3D graphene mesh network (3D GMN) was successfully designed and fabricated by folded Ni meshes assisted chemical vapor deposition method. The structure parameters of 3D GMN can be controlled well by tuning the period of Ni mesh and the electroplating time. With the increase of the density of 3D GMN, the electrical conductivity of 3D GMN and the thermal conductivity of 3D GMN/epoxy composite are greatly improved compared to that of the 3D graphene foam. This 3D GMN enables the high capacity of 57 mA h g 1 in an aluminum ion battery at the ultra- high rate of 40C with capacity retention of 96.5% after 200 cycles.

submitted time 2017-05-02 Hits836Downloads456 Comment 0

3. chinaXiv:201705.00520 [pdf]

Green synthesis of nanoporous Si/C anode using NaCl template with improved cycle life

Fan, X [Fan, Xu][ 1,2 ]; Jiang, XP [Jiang, Xiangping][ 1 ]; Wang, W [Wang, Wei][ 2 ]; Liu, ZP [Liu, Zhaoping][ 2 ]
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

Porous silicon/carbon (Si/C) structure has been proved of great help to enhance the electrochemical cycling performance of Si-based anode materials. Current fabrication of porous Si based anodes usually relies on the complicated chemical etching process with unavoidable pollution problem. Herein, a na- noporous Si/C composite was successfully fabricated by a facile spray drying and carbonization process. The environmentally benign NaCl is used as the sacrificing template for the generation of embedded nanopores, which can be easily removed by routine washing process. The as-prepared nanoporous Si/C anode exhibits a high reversible specific capacity of around 900 mAh g 1 with 78.2% capacity retention after 100 cycles. This synthetic method paves a simple and environment-friendly way to build porous Si based anode with improved electrochemical performance which is significantly important for the in- dustrial production.

submitted time 2017-05-02 Hits893Downloads491 Comment 0

4. chinaXiv:201705.00321 [pdf]

A facile assembly of polyimide/graphene core-shell structured nanocomposites with both high electrical and thermal conductivities

Xu, LB [Xu, Lubo][ 1 ]; Chen, GF [Chen, Guofei][ 1 ]; Wang, W [Wang, Wei][ 1 ]; Li, L [Li, Lan][ 1 ]; Fang, XZ [Fang, Xingzhong][ 1 ]

Polyimide/reduced graphene oxide [PI/r-GO] core-shell structured microspheres were fabricated by in situ reduction of graphene oxide [GO], which was coated on the surface of PI microspheres via hydrogen bonding and pi-pi stacking interaction. The highly o

submitted time 2017-05-02 Hits546Downloads350 Comment 0

5. chinaXiv:201704.00064 [pdf]

Enhanced Rate Capability of Polymer-Derived SiCN Anode Material for Electrochemical Storage of Lithium with 3-D Carbon Nanotube Network Dispersed in Nanoscale

Zhang, JW; Xu, CH; Liu, ZP; Wang, W; Xin, X; Shen, L; Zhou, XB; Zhou, J; Huang, Q

Electrochemical performances of multi-walled carbon nanotubes (CNT)-SiCN composite have been investigated. The sample was synthesized by a simple ultrasonication assisted method combined with high-temperature pyrolysis and characterized by Fourier transfo

submitted time 2017-04-06 Hits826Downloads459 Comment 0

6. chinaXiv:201703.00990 [pdf]

Enhanced Rate Capability of Polymer-Derived SiCN Anode Material for Electrochemical Storage of Lithium with 3-D Carbon Nanotube Network Dispersed in Nanoscale

Zhang, JW; Xu, CH; Liu, ZP; Wang, W; Xin, X; Shen, L; Zhou, XB; Zhou, J; Huang, Q (Huang, Q
Subjects: Materials Science >> Nanoscience and Nanotechnology

Electrochemical performances of multi-walled carbon nanotubes (CNT)-SiCN composite have been investigated. The sample was synthesized by a simple ultrasonication assisted method combined with high-temperature pyrolysis and characterized by Fourier transfo

submitted time 2017-03-30 Hits1372Downloads797 Comment 0

7. chinaXiv:201703.00955 [pdf]

Enhanced Rate Capability of Polymer-Derived SiCN Anode Material for Electrochemical Storage of Lithium with 3-D Carbon Nanotube Network Dispersed in Nanoscale

Zhang, JW; Xu, CH; Liu, ZP; Wang, W; Xin, X; Shen, L; Zhou, XB; Zhou, J; Huang, Q (Huang, Q
Subjects: Materials Science >> Nanoscience and Nanotechnology

Electrochemical performances of multi-walled carbon nanotubes (CNT)-SiCN composite have been investigated. The sample was synthesized by a simple ultrasonication assisted method combined with high-temperature pyrolysis and characterized by Fourier transfo

submitted time 2017-03-30 Hits1319Downloads786 Comment 0

8. chinaXiv:201612.00474 [pdf]

Residual effects of heavy sparticles in bottom quark Yukawa coupling: A Comparative study for MSSM and NMSSM

Wang,W; Xiong,Z; Yang,JM
Subjects:

If the sparticles are relatively heavy (a few TeV) while the Higgs sector is not so heavy ( mA is not so large), the Higgs boson Yukawa couplings can harbor sizable quantum effects of sparticles and these large residual effects may play a special role in

submitted time 2016-12-28 Hits1980Downloads1128 Comment 0

9. chinaXiv:201612.00470 [pdf]

Dark Matter in the Singlet Extension of MSSM: Explanation of Pamela and Implication on Higgs Phenomenology

Wang,W; Xiong,Z; Yang,JM; Yu,L
Subjects:

As discussed recently by Hooper and Tait, the singlino-like dark matter in the Minimal Supersymmetric Standard Model (MSSM) extended by a singlet Higgs superfield can give a perfect explanation for both the relic density and the Pamela result through the

submitted time 2016-12-28 Hits2095Downloads1262 Comment 0

10. chinaXiv:201612.00462 [pdf]

SUSY dark matter in light of CDMS II results: a comparative study for different models

Cao,J; Hikasa,K; Wang,W; Yang,JM; Yu,L
Subjects:

We perform a comparative study of the neutralino dark matter scattering on nucleon in three popular supersymmetric models: the minimal (MSSM), the next-to-minimal (NMSSM) and the nearly minimal (nMSSM). First, we give the predictions of the elastic cross

submitted time 2016-12-28 Hits1757Downloads982 Comment 0

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