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Multifunctional Polyacrylonitrile-based Pearl Nanofibrous Membrane Prepared by Electrospinning
Miao Yu,Zhuoming Chen,Binjie Xin,Xunlin Liu,Wenjun Xu 한국섬유공학회 2022 Fibers and polymers Vol.23 No.11
Pearl is a pure natural material, which has multifunctional properties such as anti-ultraviolet, anti-static and farinfraredphysiotherapy. In this study, a series of polyacrylonitrile/pearl nanofibrous membranes (PPFM) with different pearlpowders were prepared by the electrospinning method. The membranes were then investigated by scanning electronmicroscopy (SEM) and fourier-transform infrared spectroscopy (FTIR), and their functional properties such as far-infraredemission, ultraviolet (UV) protection, and electrical resistivity were also studied. The experimental results reveal that pearlpowders can significantly enhance the far-infrared emission of polyacrylonitrile (PAN), and the average emissivity wasincreased up to 0.795 in the wavelength range of 8-14 μm when the pearl powder mass fraction increased to 9 %. In addition,the UV protection factor (UPF) of the membrane with 9 % pearl powder could reach 968, while the UPF of the pristine PANmembrane was only 11, and the electrical resistivity of PPFM was also improved after blending with pearl powders. Thestudy proves that pearl powder can efficiently endow the PAN with multifunctional properties for more promisingapplications.
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Investigation of the interstitial oxygen behaviors in vanadium alloy: A first-principles study
Xingming Zhang,Yifan Li,Qiaoling He,Ruilian Li,Lei Deng,Liang Wang,Xunlin Liu,Jianfeng Tang,Huiqiu Deng,Wang-Yu Hu 한국물리학회 2018 Current Applied Physics Vol.18 No.2
This study aims at characterizing the interstitial Oxygen (O) behaviors in the Vanadium (V) Alloy by means of the first-principles calculations. For this, the interations between vacancy (Vac) and O interstitil atom are studied in detail to obtain the binding energies and stable structures of the complexes. It can be seen that monovacancy binding with two O atoms occupied the opposing octahedral stie are particularly stable, and is liable to form VacO2 cluster in the V alloys. According to the mass action analysis, the predicted temperature dependence of the concentration for VacOn complexes are presented. Apart from monovacancy, we also consider the trapping behavior of vacancy cluster on the O atoms. The results also prove that one vacancy can trap two O atoms in the V alloys. Based the diffusion theory, we obtain the diffusion coefficients as a function of temperature with or without the vacancy effect in the V alloys. The predicted O diffusion coefficients in defect-free V alloys from our first-principles calculations are in excellent ageement with the experimental data, meanings that the vacancy-limited mechanism does not play the key role for O diffusion in V alloys. Regarding the interactions between vacancy, solutes and O atom, combining with the diffusion barriers of O affected by vacancy and solute, we infer the formation mechanism of the precipitates in the V alloys.
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