Current Location:home > Browse

1. chinaXiv:201705.00514 [pdf]

A co-confined carbonization approach to aligned nitrogen-doped mesoporous carbon nanofibers and its application as an adsorbent

Chen, AB [Chen, Aibing][ 1 ]; Liu, C [Liu, Chao][ 2 ]; Yu, YF [Yu, Yifeng][ 1 ]; Hu, YQ [Hu, Yongqi][ 1 ]; Lv, HJ [Lv, Haijun][ 1 ]; Zhang, Y [Zhang, Yue][ 1 ]; Shen, SF [Shen, Shufeng][ 1 ]; Zhang, J [Zhang, Jian][ 3 ]
Subjects: Physics >> General Physics: Statistical and Quantum Mechanics, Quantum Information, etc.

Nitrogen-doped carbon nanofibers (MCNFs) with an aligned mesoporous structure were synthesized by a co-confined carbonization method using anodic aluminum oxide (AAO) membrane and tetraethy- lorthosilicate (TEOS) as co-confined templates and ionic liquids as the precursor. The as-synthesized MCNFs with the diameter of 80–120 nm possessed a bulk nitrogen content of 5.3 wt% and bimodal meso- porous structure. The nitrogen atoms were mostly bound to the graphitic network in two forms, i.e. pyridinic and pyrrolic nitrogen, providing adsorption sites for acidic gases like SO2 and CO2 . Cyclic exper- iments revealed a considerable stability of MCNFs over 20 runs of SO2 adsorption and 15 runs for CO2 adsorption. The MCNFs also have a preferable adsorption performance for Cd2+.

submitted time 2017-05-02 Hits1077Downloads531 Comment 0

2. chinaXiv:201705.00293 [pdf]

Aqueous-phase synthesis of nitrogen-doped ordered mesoporous carbon nanospheres as an efficient adsorbent for acidic gases

Chen, AB [Chen, Aibing][ 1 ]; Yu, YF [Yu, Yifeng][ 1 ]; Zhang, Y [Zhang, Yue][ 1 ]; Zang, WW [Zang, Wenwei][ 1 ]; Yu, YH [Yu, Yunhong][ 1 ]; Zhang, YX [Zhang, Yexin][ 2 ]; Shen, SF [Shen, Shufeng][ 1 ]; Zhang, J [Zhang, Jian][ 2 ]

Nitrogen-doped ordered mesoporous carbon spheres [N-OMCs] were conveniently produced by using a soluble urea-phenol-formaldehyde resin as the precursor and triblock copolymer F127 as a soft template. The obtained carbon spheres with a mean diameter of aro

submitted time 2017-05-02 Hits700Downloads430 Comment 0

3. chinaXiv:201606.00338 [pdf]

On the Higgs fit and electroweak phase transition

Huang, Weicong; Shu, Jing; Zhang, Yue
Subjects: Physics >> The Physics of Elementary Particles and Fields

We consider the Higgs portal through which light scalars contribute both to the Higgs production and decay and Higgs effective potential at finite temperature via quantum loops. The positive Higgs portal coupling required by a strongly first order electroweak phase transition is disfavored by the current Higgs data if we consider one such scalar. We observe that by introducing a second scalar with negative Higgs portal coupling, one can not only improve the Higgs fits, but also enhance the strength of first order EWPT. We apply this mechanism to the light stop scenario for electroweak baryogenesis in the MSSM and find a light sbottom could play the role as the second scalar, which allows the stop to be relatively heavier. Non-decoupled effects on the Higgs or sbottom self-interactions from physics beyond MSSM are found to be indispensable for this scenario to work. A clear prediction from the picture is the existence of a light sbottom (below 200 GeV) and a light stop (can be as heavy as 140 GeV), which can be directly tested in the near future.

submitted time 2016-06-28 Hits1545Downloads580 Comment 0

4. chinaXiv:201606.00336 [pdf]

Impact of a CP-Violating Higgs Sector: From LHC to Baryogenesis

Shu, Jing; Zhang, Yue
Subjects: Physics >> The Physics of Elementary Particles and Fields

We observe a generic connection between LHC Higgs data and electroweak baryogenesis: the particle that contributes to the CP-odd hgg or h gamma gamma vertex would provide the CP-violating source during a first-order phase transition. It is illustrated in the two Higgs doublet model that a common complex phase controls the lightest Higgs properties at the LHC, electric dipole moments, and the CP-violating source for electroweak baryogenesis. We perform a general parametrization of Higgs effective couplings and a global fit to the LHC Higgs data. Current LHC measurements prefer a nonzero phase for tan beta less than or similar to 1 and electric dipole moment constraints still allow an order-one phase for tan beta similar to 1, which gives sufficient room to generate the correct cosmic baryon asymmetry. We also give some prospects in the direct measurements of CP violation in the Higgs sector at the LHC.

submitted time 2016-06-28 Hits1401Downloads739 Comment 0

  [1 Pages/ 4 Totals]