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Effect of Nanoparticle Size on the Interface Bond Energy in KTa0.5Nb0.5O3 / Polyimide Composites
Chuntian Chen,Juan Wang,Wenlong Yang,Xiaokang Li,Jingyun Zhang 보안공학연구지원센터 2014 International Journal of Hybrid Information Techno Vol.7 No.6
The effects of particle size on the interface bond energy in KTa0.5Nb0.5O3/ polyimide composites were investigated using the molecular dynamics method. The composites of polyimide and the KTa0.5Nb0.5O3 nanoparticles with different size (0.4 nm, 0.5 nm, 0.6 nm, 0.8 nm, 1.2 nm, and 1.4 nm) have been established and simulated using the Forcite program package of Materials Studio software. The calculated results show that the interface bond energy is 38~150 Kcal/mol, which indicate the Van der Waals force exist between the nanoparticle and polyimide matrix. The interface bond energy of the smaller nanoparticle is greater than the lager nanaparticle due to the size effect. The introduction of the smaller nanoparticle could generate the stronger intermolecular bonding interaction between the nanoparticle and polyimide matrix.
Wenlong Xu,Xue Yang,Binjie Xin 한국섬유공학회 2020 Fibers and polymers Vol.21 No.1
Polyacrylonitrile (PAN)/cellulose nanofibril (CNF) nanofiber membranes were successfully prepared by anelectrospinning method, in which the amount of CNF kept 1 wt%. The effects of CNF sizes on the morphology and propertyof spinning solutions and PAN electrospun nanofiber membrane were systematically investigated by rheological propertytest, conductivity test, SEM, TG, DSC, contact angle test and mechanical test. The results showed that the viscosity andconductivity of the spinning solution was improved with the increasing of CNF sizes, as the formation of the strong polarinteractions of nitrile groups and the hydroxyl groups between PAN and CNF. All the morphology of the PAN/CNF nanofibermembrane exhibited a uniform diameter with no visible beads or beads to the string structure, and the average diameter of thePAN/CNF nanofiber was decreased with the increasing of the CNF size. Moreover, the addition of CNF could improve thethermal stability, mechanical property, and hydrophilicity of the PAN membrane. And the PAN/CNF-10 nanofiber membraneexhibited the optimal properties.
Yang Liu,Wenlong Luo 한국분자세포생물학회 2012 Molecules and cells Vol.33 No.5
Betulinic acid (BetA) is an effective and potential anti-cancer chemical derived from plants. BetA can kill a broad range of tumor cell lines, but has no effect on untransformed cells. The chemical also kills melanoma, leukemia, lung, colon, breast, prostate and ovarian cancer cells via induction of apoptosis, which depends on caspase activation. However, no reports are yet available about the effects of BetA on nasopharyngeal carcinoma (NPC), a widely spread malignancy in the world, especially in East Asia. In this study, we first showed that BetA can effectively kill CNE2 cells, a cell line derived from NPC. BetA-induced CNE2 apoptosis was characterized by typical apoptosis hallmarks: caspase activation, DNA fragmentation, and cytochrome c release. Overexpression of Bcl-2 and Bcl-xL could partially prevent apoptosis caused by BetA. Moreover, Bax was not activated during the induction of apoptosis. Bax/Bak knockdown and wild-type CNE2 cells showed the same kinetics of cytochrome c release. We then showed that BetA may impair mitochondrial permeability transition pores (mPTPs), which may partially contribute to cytochrome c release. These observations suggest that BetA may serve as a potent and effective anti-cancer agent in NPC treatment. Further exploration of the mechanism of action of BetA could yield novel break-throughs in anti-cancer drug discovery.
Effects of electronic energy deposition on pre-existing defects in 6H-SiC
Liao, Wenlong,He, Huan,Li, Yang,Liu, Wenbo,Zang, Hang,Wei, Jianan,He, Chaohui Korean Nuclear Society 2021 Nuclear Engineering and Technology Vol.53 No.7
Silicon carbide is widely used in radiation environments due to its excellent properties. However, when exposed to the strong radiation environment constantly, plenty of defects are generated, thus causing the material performance downgrades or failures. In this paper, the two-temperature model (2T-MD) is used to explore the defect recovery process by applying the electronic energy loss (Se) on the pre-damaged system. The effects of defect concentration and the applied electronic energy loss on the defect recovery process are investigated, respectively. The results demonstrate that almost no defect recovery takes place until the defect density in the damage region or the local defect density is large enough, and the probability of defect recovery increases with the defect concentration. Additionally, the results indicate that the defect recovery induced by swift heavy ions is mainly connected with the homogeneous recombination of the carbon defects, while the probability of heterogeneous recombination is mainly dependent on the silicon defects.
Li Wenlong,Wang Lianshan,Chai Ruohao,Wen Ling,Lu Haixia,Wang Huanhua,Yang Shaoyan,Sun Wenhong 한국물리학회 2022 Current Applied Physics Vol.39 No.-
Semipolar (1122) GaN epitaxial films were grown on m-plane sapphire substrates by metal-organic chemical vapor deposition and additional high-temperature nitridation was introduced during the growth. The growth mechanism, surface microtopography, and the full width at half maximum (FWHM) of X-ray rocking curves (XRCs) of on-axis and off-axis (1122) GaN planes were investigated. The results demonstrate that additional high-temperature nitridation process could reduce surface roughness and anisotropy, and suppress the other orientations, and partially improve the crystalline quality of (1122) GaN epitaxial films. The XRCs FWHM of the off-axis (1122) GaN planes decrease and show a different varying tendency after additional high-temperature nitridation process associated with the partial dislocations and basal plane stacking faults (BSFs). The results of the modified Williamson-Hall (W–H) analysis and photoluminescence spectrum show the BSFs increased while the partial dislocations decreased after an additional high-temperature nitridation process. The improvement of crystalline quality was mainly correlated to the reduction of partial dislocations.
Huan Li,Wenlong Yang,Zhongxiang Zhou,Hao Tian 대한금속·재료학회 2013 ELECTRONIC MATERIALS LETTERS Vol.9 No.5
The structure, microstructure, and piezoelectric properties of conventionally sintered Yb-doped K0.5Na0.5NbO3(KNN) lead-free ceramics were investigated. Doping the KNN ceramics with Yb2O3 was effective in inhibiting the grain growth in the KNN ceramics and in densifying the ceramics. The 1.0 wt. % Yb-doped KNN ceramics showed the maximum density, about 96.8% of the theoretical density. X-ray diffraction analysis showed that a small number of Yb3+ ions could be incorporated into the matrix of the ceramicsto occupythe α- or β-sites in the crystal lattice, thereby significantly affecting the piezoelectric properties of the ceramics. Enhanced piezoelectric properties (i.e., d33= 135 pC/N, kp = 34.5%, and Qm = 80.2) were obtained for the 0.50 wt. %Yb-doped KNN ceramics.
Design and Kinematic Modeling of a Notch Continuum Manipulator for Laryngeal Surgery
Haodong Wang,Xiaolong Wang,Wenlong Yang,Zhijiang Du 제어·로봇·시스템학회 2020 International Journal of Control, Automation, and Vol.18 No.11
A notch continuum manipulator with a large cavity is presented. The continuum manipulator which is designed for laryngeal surgery is composed of guidewire discs and a Nitinol skeleton. The deformation of the continuum manipulator is superimposed by the flexible units, therefore its posture and driving force are coupled. Based on the small deformation cantilever beam theory, the mechanical model from the microscopic to the macroscopic is used to establish the mapping from the driving space to the joint space. The manipulator is assumed to be a multi-joint series robot. Based on the mechanical model, the mapping from the joint space to the Cartesian space is established by the Denavit-Hartenberg (D-H) method. The kinematics is established from the driving space to the Cartesian space. The proposed kinematic model is verified by a prototype. The experimental results show the validity of the model.