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Air Recirculation and Its Effect on Microfiber Spinning in Blunt-Die Melt Blowing
Sheng Xie,Guojun Jiang,Xianyan Wu,Yaping Wang,Haisu Fang,Baoqing Shentu 한국섬유공학회 2021 Fibers and polymers Vol.22 No.3
In the present work, approaches of the Computational Fluid Dynamics (CFD) simulation, the Particle ImageVelocimetry (PIV) measurement, and the spinning experiment were applied to investigate the phenomenon of air recirculation inblunt-die melt-blown airflow. Firstly, the characteristics of air recirculation were explored by CFD simulation. The simulationresults predicted that the air recirculation generated a lateral air velocity along the nose-piece direction. Then, the aircirculation was experimental verified by using PIV technique. The PIV results confirmed the predicted conclusions of CFDsimulation. Finally, the effect of air recirculation on the microfiber spinning during the melt-blown process was experimentallyinvestigated by a spinning experiment using a blunt die with nose-piece width of 2.56 mm. The spinning results indicated thatthe air circulation had a tendency of splitting the normal polymeric stream, which played negative effect on the continuity ofmicrofiber spinning. This work is expected to provide some clues to melt-blown die design and the quality control ofnonwoven products.
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Deng Shuping,Jiang Xianyan,Zhang Ziye,Liu Junjie,Chen Lili,Qi Ning,Tang Xinfeng,Wu Yichu,Chen Zhiquan 한국물리학회 2021 Current Applied Physics Vol.26 No.-
In this paper, a series of CuIn1-xGaxTe2 samples were prepared by vacuum melting combined with the spark plasma sintering process based on the initial stoichiometric ratios of 1: 1-x: x: 2 (x = 0, 0.1, 0.2, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9 and 1.0). Crystal results indicate that all Cu(In, Ga)Te2 system samples are the chalcopyrite structure with space group I42d. Thermal analysis results show that all the samples have excellent reproducibility and thermal stability. EPMA data indicates that Ga tended to replace In site instead of Cu or Te. Meanwhile, the roomtemperature carrier concentration of all p-type samples varies from 0.30 × 1019 to 1.25 × 1019cm 3, since carrier mobility changes from 15.16 to 69.27 cm2 V 1 s 1. Ultimately, the significantly reduced total thermal conductivity is observed in the Ga-doped samples, and the maximum ZT value of 0.80 is obtained at 773 K for the CuIn0.8Ga0.2Te2 sample due to the lower thermal conductivity
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Tao Liu,Jingjing Dong,Chaonan Ye,Xianyan Wu,Wei Fan,Linlin Lu,Jingyu Kang,Xingzhong Gao,Baozhong Sun,Honglei Yi 한국섬유공학회 2022 Fibers and polymers Vol.23 No.12
In this work, the bending modal properties of three-dimensional (3D) braided composites were investigated withthe experimental and numerical methods. Three braided angles were selected to study the braided angle effect on the modalbehavior of 3D braided composites. According to the experimental parameters, a homogeneous model containing the interior,surface and corner representative unit cells of the braided composites were proposed to compute the elastic constants of eachcomposite. Besides, the fiber breakage defects were introduced to the homogeneous model to improve the accuracy ofpredicting the modal behavior of the braided composite. The results indicate that the increase of the braided angle and thefiber breakage defects could apparently reduce the natural frequency of the braided composite. The modal propertiessimulated by the homogeneous models containing some fiber breakage defects could fit well with the correspondingexperimental results. The proposed method to create the homogenous model can be used to predict the modal behavior of the3D braided composites.
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Yingming Wei,Zhongxiu Wang,Jiayin Han,Xiaojian Jiang,Lihong Lei,Xianyan Yang,Weilian Sun,Zhongru Gou,Lili Chen 한국생체재료학회 2022 생체재료학회지 Vol.26 No.4
Background: Destruction of alveolar bone and periodontal ligament due to periodontal disease often requires surgical treatment to reconstruct the biological construction and functions of periodontium. Despite significant advances in dental implants in the past two decades, it remains a major challenge to adapt bone grafts and barrier membrane in surgery due to the complicated anatomy of tooth and defect contours. Herein, we developed a novel biphasic hierarchical architecture with modularized functions and shape based on alveolar bone anatomy to achieve the ideal outcomes. Methods: The integrated hierarchical architecture comprising of nonstoichiometric wollastonite (nCSi) scaffolds and gelatin methacrylate/silanized hydroxypropyl methylcellulose (GelMA/Si-HPMC) hydrogel membrane was fabricated by digital light processing (DLP) and photo-crosslinked hydrogel injection technique respectively. The rheological parameters, mechanical properties and degradation rates of composite hydrogels were investigated. L-929 cells were cultured on the hydrogel samples to evaluate biocompatibility and cell barrier effect. Cell scratch assay, alkaline phosphatase (ALP) staining, and alizarin red (AR) staining were used to reveal the migration and osteogenic ability of hydrogel membrane based on mouse mandible-derived osteoblasts (MOBs). Subsequently, a critical-size one-wall periodontal defect model in dogs was prepared to evaluate the periodontal tissue reconstruction potential of the biphasic hierarchical architecture. Results: The personalized hydrogel membrane integrating tightly with the nCSi scaffolds exhibited favorable cell viability and osteogenic ability in vitro, while the scratch assay showed that osteoblast migration was drastically correlated with Si-HPMC content in the composite hydrogel. The equivalent composite hydrogel has proven good physiochemical properties, and its membrane exhibited potent occlusive effect in vivo; meanwhile, the hierarchical architectures exerted a strong periodontal regeneration capability in the periodontal intrabony defect models of dogs. Histological examination showed effective bone and periodontal ligament regeneration in the biomimetic architecture system; however, soft tissue invasion was observed in the control group. Conclusions: Our results suggested that such modularized hierarchical architectures have excellent potential as a next-generation oral implants, and this precisely tuned guided tissue regeneration route offer an opportunity for improving periodontal damage reconstruction and reducing operation sensitivity.
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