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Runcang Sun - One of the best experts on this subject based on the ideXlab platform.
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mechanical and viscoelastic properties of cellulose nanocrystals reinforced poly ethylene glycol nanocomposite hydrogels
ACS Applied Materials & Interfaces, 2013Co-Authors: Jun Yang, Chunrui Han, Jiufang Duan, Runcang SunAbstract:The preparation and mechanical properties of elastomeric nanocomposite hydrogels consisting of cellulose nanocrystals (CNCs) and poly(ethylene glycol) (PEG) are reported. The aqueous nanocomposite CNC/PEG precursor solutions covalently cross-linked through a one-stage photocross-linking process. The mechanical properties of nanocomposite hydrogels, including Young’s modulus (E), Fracture stress (σ), and Fracture Strain (e), were measured as a function of CNC volume fraction (ϕCNC, 0.2–1.8%, v/v) within polymeric matrix. It was found that the homogeneously dispersed nanocomposite hydrogels can be prepared with ϕCNC being less than 1.5%, whereas the heterogeneous nanocomposite hydrogels were obtained with ϕCNC being higher than 1.5%. The nanocomposite hydrogels exhibited higher strengths and flexibilities when compared with neat PEG hydrogels, where the modulus, Fracture stress, and Fracture Strain enhanced by a factor of 3.48, 5, and 3.28, respectively, over the matrix material alone at 1.2% v/v CNC loadin...
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mechanical and viscoelastic properties of cellulose nanocrystals reinforced poly ethylene glycol nanocomposite hydrogels
ACS Applied Materials & Interfaces, 2013Co-Authors: Jun Yang, Chunrui Han, Jiufang Duan, Runcang SunAbstract:The preparation and mechanical properties of elastomeric nanocomposite hydrogels consisting of cellulose nanocrystals (CNCs) and poly(ethylene glycol) (PEG) are reported. The aqueous nanocomposite CNC/PEG precursor solutions covalently cross-linked through a one-stage photocross-linking process. The mechanical properties of nanocomposite hydrogels, including Young's modulus (E), Fracture stress (σ), and Fracture Strain (e), were measured as a function of CNC volume fraction (φCNC, 0.2-1.8%, v/v) within polymeric matrix. It was found that the homogeneously dispersed nanocomposite hydrogels can be prepared with φCNC being less than 1.5%, whereas the heterogeneous nanocomposite hydrogels were obtained with φCNC being higher than 1.5%. The nanocomposite hydrogels exhibited higher strengths and flexibilities when compared with neat PEG hydrogels, where the modulus, Fracture stress, and Fracture Strain enhanced by a factor of 3.48, 5, and 3.28, respectively, over the matrix material alone at 1.2% v/v CNC loading. Oscillatory shear data indicated the CNC-PEG nanocomposite hydrogels were more viscous than the neat PEG hydrogels and were efficient at energy dissipation due to the reversible interactions between CNC and PEG polymer chains. It was proposed that the strong gel viscoelastic behavior and the mechanical reinforcement were related to "filler network", where the temporary interactions between CNC and PEG interfered with the covalent cross-links of PEG.
Jun Yang - One of the best experts on this subject based on the ideXlab platform.
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mechanical and viscoelastic properties of cellulose nanocrystals reinforced poly ethylene glycol nanocomposite hydrogels
ACS Applied Materials & Interfaces, 2013Co-Authors: Jun Yang, Chunrui Han, Jiufang Duan, Runcang SunAbstract:The preparation and mechanical properties of elastomeric nanocomposite hydrogels consisting of cellulose nanocrystals (CNCs) and poly(ethylene glycol) (PEG) are reported. The aqueous nanocomposite CNC/PEG precursor solutions covalently cross-linked through a one-stage photocross-linking process. The mechanical properties of nanocomposite hydrogels, including Young’s modulus (E), Fracture stress (σ), and Fracture Strain (e), were measured as a function of CNC volume fraction (ϕCNC, 0.2–1.8%, v/v) within polymeric matrix. It was found that the homogeneously dispersed nanocomposite hydrogels can be prepared with ϕCNC being less than 1.5%, whereas the heterogeneous nanocomposite hydrogels were obtained with ϕCNC being higher than 1.5%. The nanocomposite hydrogels exhibited higher strengths and flexibilities when compared with neat PEG hydrogels, where the modulus, Fracture stress, and Fracture Strain enhanced by a factor of 3.48, 5, and 3.28, respectively, over the matrix material alone at 1.2% v/v CNC loadin...
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mechanical and viscoelastic properties of cellulose nanocrystals reinforced poly ethylene glycol nanocomposite hydrogels
ACS Applied Materials & Interfaces, 2013Co-Authors: Jun Yang, Chunrui Han, Jiufang Duan, Runcang SunAbstract:The preparation and mechanical properties of elastomeric nanocomposite hydrogels consisting of cellulose nanocrystals (CNCs) and poly(ethylene glycol) (PEG) are reported. The aqueous nanocomposite CNC/PEG precursor solutions covalently cross-linked through a one-stage photocross-linking process. The mechanical properties of nanocomposite hydrogels, including Young's modulus (E), Fracture stress (σ), and Fracture Strain (e), were measured as a function of CNC volume fraction (φCNC, 0.2-1.8%, v/v) within polymeric matrix. It was found that the homogeneously dispersed nanocomposite hydrogels can be prepared with φCNC being less than 1.5%, whereas the heterogeneous nanocomposite hydrogels were obtained with φCNC being higher than 1.5%. The nanocomposite hydrogels exhibited higher strengths and flexibilities when compared with neat PEG hydrogels, where the modulus, Fracture stress, and Fracture Strain enhanced by a factor of 3.48, 5, and 3.28, respectively, over the matrix material alone at 1.2% v/v CNC loading. Oscillatory shear data indicated the CNC-PEG nanocomposite hydrogels were more viscous than the neat PEG hydrogels and were efficient at energy dissipation due to the reversible interactions between CNC and PEG polymer chains. It was proposed that the strong gel viscoelastic behavior and the mechanical reinforcement were related to "filler network", where the temporary interactions between CNC and PEG interfered with the covalent cross-links of PEG.
H.f. Zhang - One of the best experts on this subject based on the ideXlab platform.
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design of single phase high entropy alloys composed of low thermal neutron absorption cross section elements for nuclear power plant application
Intermetallics, 2019Co-Authors: Enhou Han, C Xiang, Z M Zhang, J Q Wang, H.f. ZhangAbstract:Abstract Two quinary high-entropy alloys MoNbCrVTi and MoNbCrZrTi were designed and prepared for the two following goals. The first goal is to search for single-phase high-entropy alloys composed of low thermal neutron absorption cross-section elements, and the second goal is to verify the validity of the empirical parameters calculation and CALPHAD (acronym of CALculation of PHAse Diagrams) calculation in the initiatory selection process of desired alloys from numerous candidates. The density, hardness, microstructure, and compressive mechanical properties of the two alloys were preliminarily investigated, and the phase formation of these two alloys was also discussed. The MoNbCrVTi alloy consists of a single BCC phase with typical dendritic microstructure, while the MoNbCrZrTi alloy mainly consists of a BCC phase plus a C15 Laves phase. The densities of the as-cast MoNbCrVTi and MoNbCrZrTi alloys were determined to be 7.30 ± 0.01 and 7.33 ± 0.01 g/cm3, respectively. The MoNbCrVTi alloy exhibits a hardness of 494.4 ± 7.7 Hv, a high yield strength of 1281 MPa and a Fracture Strain of 9.4% at room temperature. By comparison, the MoNbCrZrTi alloy exhibits a hardness of 552.9 ± 8.6 Hv, a higher yield strength of 1454 MPa but a lower Fracture Strain of 2.7%. The proposed two goals are basically achieved based on the preliminary results.
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shear band formation and mechanical properties of zr38ti17cu10 5co12be22 5 bulk metallic glass porous tungsten phase composite by hydrostatic extrusion
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2010Co-Authors: Yunfei Xue, Fuchi Wang, L Wang, H W Cheng, H.f. ZhangAbstract:Zr38Ti17Cu10.5Co12Be22.5 bulk metallic glass/porous tungsten phase composites were prepared via a method by combining infiltrating the molten alloy into the reinforcement with hydrostatic extrusion. The deformation and failure behavior of the as-extruded composite were investigated at room temperature under quasistatic compression. Compared to the as-cast composite, the as-extruded composite presented greater flow stress and lower Fracture Strain. Different from the Fracture mode of multiple macro shear bands for the as-cast composite, fractrographic analysis revealed that the specimen for the as-extruded composite Fractured by a mixture of shearing and axial splitting. It is suggested that the increase in flow stress for the as-extruded composite is attributed to the extrusion process which introduced hardened condition in the tungsten phase. The Fracture Strain of the as-extruded composite decreased by comparison with the as-cast composite is proposed to result from the joint effects of the employed extrusion process sacrificed part of the plasticity, relatively high flow stress exceeded the Fracture stress of the pure metallic glass, and the elongated grain structure resulted in splitting mode for the as-extruded composite.
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Dynamic compressive deformation and failure behavior of Zr-based metallic glass reinforced porous tungsten composite
Materials Science and Engineering A-structural Materials Properties Microstructure and Processing, 2006Co-Authors: Yunfei Xue, H.n. Cai, L. Wang, Fuchi Wang, H.f. ZhangAbstract:The dynamic compressive deformation and Fracture behavior of the Zr-based metallic glass reinforced porous tungsten composite were investigated at room temperature by means of the Split Hopkinson Pressure Bar (SHPB). Both Fracture stress and Fracture Strain increased significantly compared to the pure metallic glass phase. The deformation behavior of the composite was found to be dominated by the ductile W phase and the 3D net structure of the W phase. It was found that the composite appeared to exhibit some work hardening during the dynamic compressive deformation. The failure mode of the specimen is a mixture of one major shear band and axial splitting, and the shear plane inclined similar to 56 degrees with respect to the loading axis. Scanning election microscope (SEM) was used to evaluate damage initiation and propagation. It was found that the increase of Fracture stress and Fracture Strain is due to the interaction between localized shear banding and axial splitting, promoting additional Fracture surface area, and large volume fraction of ductile W phase. The dynamic compressive deformation and Fracture behavior of the composite are discussed by taking the effect of the complex stress state within the composite into account. (c) 2006 Elsevier B.V. All rights reserved.
Jiufang Duan - One of the best experts on this subject based on the ideXlab platform.
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mechanical and viscoelastic properties of cellulose nanocrystals reinforced poly ethylene glycol nanocomposite hydrogels
ACS Applied Materials & Interfaces, 2013Co-Authors: Jun Yang, Chunrui Han, Jiufang Duan, Runcang SunAbstract:The preparation and mechanical properties of elastomeric nanocomposite hydrogels consisting of cellulose nanocrystals (CNCs) and poly(ethylene glycol) (PEG) are reported. The aqueous nanocomposite CNC/PEG precursor solutions covalently cross-linked through a one-stage photocross-linking process. The mechanical properties of nanocomposite hydrogels, including Young’s modulus (E), Fracture stress (σ), and Fracture Strain (e), were measured as a function of CNC volume fraction (ϕCNC, 0.2–1.8%, v/v) within polymeric matrix. It was found that the homogeneously dispersed nanocomposite hydrogels can be prepared with ϕCNC being less than 1.5%, whereas the heterogeneous nanocomposite hydrogels were obtained with ϕCNC being higher than 1.5%. The nanocomposite hydrogels exhibited higher strengths and flexibilities when compared with neat PEG hydrogels, where the modulus, Fracture stress, and Fracture Strain enhanced by a factor of 3.48, 5, and 3.28, respectively, over the matrix material alone at 1.2% v/v CNC loadin...
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mechanical and viscoelastic properties of cellulose nanocrystals reinforced poly ethylene glycol nanocomposite hydrogels
ACS Applied Materials & Interfaces, 2013Co-Authors: Jun Yang, Chunrui Han, Jiufang Duan, Runcang SunAbstract:The preparation and mechanical properties of elastomeric nanocomposite hydrogels consisting of cellulose nanocrystals (CNCs) and poly(ethylene glycol) (PEG) are reported. The aqueous nanocomposite CNC/PEG precursor solutions covalently cross-linked through a one-stage photocross-linking process. The mechanical properties of nanocomposite hydrogels, including Young's modulus (E), Fracture stress (σ), and Fracture Strain (e), were measured as a function of CNC volume fraction (φCNC, 0.2-1.8%, v/v) within polymeric matrix. It was found that the homogeneously dispersed nanocomposite hydrogels can be prepared with φCNC being less than 1.5%, whereas the heterogeneous nanocomposite hydrogels were obtained with φCNC being higher than 1.5%. The nanocomposite hydrogels exhibited higher strengths and flexibilities when compared with neat PEG hydrogels, where the modulus, Fracture stress, and Fracture Strain enhanced by a factor of 3.48, 5, and 3.28, respectively, over the matrix material alone at 1.2% v/v CNC loading. Oscillatory shear data indicated the CNC-PEG nanocomposite hydrogels were more viscous than the neat PEG hydrogels and were efficient at energy dissipation due to the reversible interactions between CNC and PEG polymer chains. It was proposed that the strong gel viscoelastic behavior and the mechanical reinforcement were related to "filler network", where the temporary interactions between CNC and PEG interfered with the covalent cross-links of PEG.
Chunrui Han - One of the best experts on this subject based on the ideXlab platform.
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mechanical and viscoelastic properties of cellulose nanocrystals reinforced poly ethylene glycol nanocomposite hydrogels
ACS Applied Materials & Interfaces, 2013Co-Authors: Jun Yang, Chunrui Han, Jiufang Duan, Runcang SunAbstract:The preparation and mechanical properties of elastomeric nanocomposite hydrogels consisting of cellulose nanocrystals (CNCs) and poly(ethylene glycol) (PEG) are reported. The aqueous nanocomposite CNC/PEG precursor solutions covalently cross-linked through a one-stage photocross-linking process. The mechanical properties of nanocomposite hydrogels, including Young’s modulus (E), Fracture stress (σ), and Fracture Strain (e), were measured as a function of CNC volume fraction (ϕCNC, 0.2–1.8%, v/v) within polymeric matrix. It was found that the homogeneously dispersed nanocomposite hydrogels can be prepared with ϕCNC being less than 1.5%, whereas the heterogeneous nanocomposite hydrogels were obtained with ϕCNC being higher than 1.5%. The nanocomposite hydrogels exhibited higher strengths and flexibilities when compared with neat PEG hydrogels, where the modulus, Fracture stress, and Fracture Strain enhanced by a factor of 3.48, 5, and 3.28, respectively, over the matrix material alone at 1.2% v/v CNC loadin...
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mechanical and viscoelastic properties of cellulose nanocrystals reinforced poly ethylene glycol nanocomposite hydrogels
ACS Applied Materials & Interfaces, 2013Co-Authors: Jun Yang, Chunrui Han, Jiufang Duan, Runcang SunAbstract:The preparation and mechanical properties of elastomeric nanocomposite hydrogels consisting of cellulose nanocrystals (CNCs) and poly(ethylene glycol) (PEG) are reported. The aqueous nanocomposite CNC/PEG precursor solutions covalently cross-linked through a one-stage photocross-linking process. The mechanical properties of nanocomposite hydrogels, including Young's modulus (E), Fracture stress (σ), and Fracture Strain (e), were measured as a function of CNC volume fraction (φCNC, 0.2-1.8%, v/v) within polymeric matrix. It was found that the homogeneously dispersed nanocomposite hydrogels can be prepared with φCNC being less than 1.5%, whereas the heterogeneous nanocomposite hydrogels were obtained with φCNC being higher than 1.5%. The nanocomposite hydrogels exhibited higher strengths and flexibilities when compared with neat PEG hydrogels, where the modulus, Fracture stress, and Fracture Strain enhanced by a factor of 3.48, 5, and 3.28, respectively, over the matrix material alone at 1.2% v/v CNC loading. Oscillatory shear data indicated the CNC-PEG nanocomposite hydrogels were more viscous than the neat PEG hydrogels and were efficient at energy dissipation due to the reversible interactions between CNC and PEG polymer chains. It was proposed that the strong gel viscoelastic behavior and the mechanical reinforcement were related to "filler network", where the temporary interactions between CNC and PEG interfered with the covalent cross-links of PEG.
