Wei Mai
Tianjin Polytechnic University
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Publication
Featured researches published by Wei Mai.
Journal of Materials Chemistry | 2013
Jiguo Zhang; Zhiwei Xu; Wei Mai; Chunying Min; Baoming Zhou; Mingjing Shan; Yinglin Li; Caiyun Yang; Zhen Wang; Xiaoming Qian
Polyvinylidene fluoride (PVDF)–oxidized carbon nanotubes (OMWCNTs), PVDF–graphene oxide (GO) and PVDF–OMWCNTs–GO composite ultrafiltration membranes were prepared by solution-blending the ternary mixture of PVDF–oxidized low-dimensional carbon nanomaterials–dimethylacetamide in combination with the phase inversion method. The microscope images of the PVDF matrix microstructure showed that the composite membranes exhibited a bigger mean pore size and higher roughness parameters than pristine membranes. The contact angle of the membranes decreased from 78.5° (PVDF) to 66.8° (PVDF–OMWCNTs), 66.4° (PVDF–GO) and 48.5° (PVDF–OMWCNTs–GO). For the PVDF–OMWCNTs, PVDF–GO and PVDF–OMWCNTs–GO composite membranes, there was a 99.33%, 173.03% and 240.03% increase in permeation flux and a 21.71%, 17.23% and 14.29% increase in bovine serum albumin (BSA) rejection, respectively, compared with those of the pristine membranes. The newly developed composite ultrafiltration membranes demonstrate an impressive prospect for the anti-irreversible fouling performance in multi-cycle operations from BSA treatment. Additionally, the addition of OMWCNTs and GO increased the tensile strength of composite membranes from 1.866 MPa to 2.106 MPa and 2.686 MPa, respectively. Conspicuously, the PVDF composite ultrafiltration membranes endowed with oxidized low-dimensional carbon nanomaterials demonstrated fascinating hydrophilicity, permeability, antifouling and mechanical performance and promising application prospects owing to the rich oxygen-containing functional groups, high specific surface and synergistic effect of inorganic additive.
Journal of Materials Science | 2015
Lei Chen; Hao Jin; Zhiwei Xu; Jialu Li; Qiwei Guo; Mingjing Shan; Caiyun Yang; Zhen Wang; Wei Mai; Bowen Cheng
To improve the interfacial properties of carbon fibers/epoxy composites, we introduced a gradient interphase reinforced by graphene sheets between carbon fibers and matrix with a liquid phase deposition strategy. Interlaminar shear strength and flexural strength of the composites are both improved. The interfacial reinforcing mechanisms are explored by analyzing the structure of interfacial phase with linear scanning system of scanning electron microscope and atomic force microscope. Results indicate that carbon element shows a graded dispersion in the interface region and a gradient interface layer with the modulus decreasing from fibers and matrix is found to be built. To verify the effect of gradient interphase on the interfacial properties of composites, the mixture of carbon fiber/graphene/epoxy is sonicated before curing to disperse graphene sheets in matrix homogeneously. As a result, gradient interphase structures are disappeared and interfacial performance of composites is found to be weakened. The role of gradient interface layers in enhancing interfacial performances is further proved from a different angle.
RSC Advances | 2018
Tingting Feng; Yufen Zhao; Jie Shi; Liangsen Liu; Nan Li; Zhiwei Xu; Lihuan Zhao; Xu Tian; Wei Mai; Yinglin Li
To explore the mechanism of microvoid evolution and the pertinence of microvoid and mechanical behavior of carbon fibers (CFs) in γ-irradiation, T700 CFs were exposed to γ-rays under epoxy chloropropane (ECP) and argon (Ar) at room temperature. The results from small angle X-ray scattering (SAXS) showed that the average microvoid radius of the CFs decreased gradually from 4.8406 nm for pristine fibers to 3.6868 nm (ECP) and 3.4223 nm (Ar), indicating that γ-irradiation could obviously decrease the microvoid in CFs owing to annealing and rearrangement effects. More significantly, active media would enlarge the surface microvoid of fibers, thus the microvoid of CFs irradiated in ECP was overall larger than that in Ar. The tensile strength of CFs was increased from 5.74 GPa for the pristine fibers to 6.78 GPa (Ar) and 6.18 GPa (ECP) for the irradiated CFs along with a decrease in the microvoid. Therefore, this would provide a key to investigate the evolution of the CF microvoid during γ-irradiation, which was conducive to improving the mechanical properties of γ-irradiated CFs.
Journal of Applied Polymer Science | 2013
Wenxiao Li; Chengbo Shi; Mingjing Shan; Qiwei Guo; Zhiwei Xu; Zhen Wang; Caiyun Yang; Wei Mai; Jiarong Niu
Journal of Alloys and Compounds | 2017
Xianhua Li; Baoming Zhou; Wei Wang; Zhiwei Xu; Nan Li; Liyun Kuang; Cuiyu Li; Wei Mai; Hongjun Fu; Hanming Lv
Journal of Applied Polymer Science | 2014
Hui Deng; Fan Wu; Lei Chen; Zhiwei Xu; Liangsen Liu; Caiyun Yang; Wei Mai; Bowen Cheng
Composites Science and Technology | 2018
Haibo Wang; Nan Li; Zhiwei Xu; Xu Tian; Wei Mai; Jing Li; Cheng Chen; Lei Chen; Hongjun Fu; Xingxiang Zhang
Ceramics International | 2018
Yaohui Liang; Baoming Zhou; Nan Li; Liangsen Liu; Zhiwei Xu; Fengyan Li; Jing Li; Wei Mai; Xiaoming Qian; Ning Wu
Polymer Composites | 2018
Ce Zhang; Liangsen Liu; Zhiwei Xu; Hanming Lv; Ning Wu; Baoming Zhou; Wei Mai; Lihuan Zhao; Xu Tian; Xingfeng Guo
Journal of Materials Science | 2018
Liyan Liu; Hui Kang; Wei Wang; Zhiwei Xu; Wei Mai; Jing Li; Hanming Lv; Lihuan Zhao; Xiaoming Qian