MATERIALS CHEMISTRY AND PHYSICS
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2023
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IF 4.6
Yang Cao,Houde Cheng,Ning Gu,Kangtai Ou,Zhi Wang,Qianxiao Liu,Ruihua Guan,Qiang Fu,Youyi Sun
In a long-term working environment, the mechanical durability is still the highest challenge for their practical applications of superhydrophobic coatings. Here, a novel superhydrophobic coating is prepared and developed by the electrostatic spraying to improve mechanical durability. The superhydrophobic coating is composed of polyvinylidene fluoride (PVDF) and SiO 2 nanoparticles modified with n-octyltriethoxysilane (OTS) and γ-methacryloxypropyltrimethoxysilane (KH570). Interestingly, the water contact angle of the superhydrophobic coating increases from 155° to 161.7 o after 600 abrasion cycles, which is rarely reported in previous works. In addition, the superhydrophobic coating exhibits excellent adhesion strength (ca.6.0 MPa) and good anti-icing performance in extremely low temperature environments. The mechanism of above excellent performance is also investigated and proposed by molecular dynamics simulation . This work thus reports a new approach to design and fabricate high-performance superhydrophobic coating for various practical applications.
研究领域:
材料科学
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表面工程
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涂层技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2022
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IF 16.744
Ying Ma,Hao Wang,Qiqi Wang,Xiaodong Cao,Huichang Gao
Due to the complex structural hierarchy and regenerative microenvironment of peripheral nerves, developing a nerve guidance conduit (NGC) that can replace autografts for repairing long-distance nerve defects remains a challenge. To overcome this limitation, a multi-channel NGC with dual electrical activity of piezoelectricity and conductivity was constructed to enhance peripheral nerve regeneration. Silk fibroin (SF) was adopted to prepare a multi-channel cryogel scaffold by gradient freezing method, and then poly(3,4-ethylenedioxythiophene) (PEDOT) in situ polymerization based on the porous structure of the cryogel was carried out to achieve good conductivity. Meanwhile, a polyvinylidene fluoride (PVDF)/poly ( l -lactic acid- co -caprolactone) (PLCL) film with spontaneous electrical properties and high mechanical strength was constructed and wrapped in the outer layer of SF/PEDOT cryogel to construct an NGC with spontaneous electrical stimulation properties and surgical suture resistance, providing a biomimetic electrophysiological microenvironment for peripheral nerve regeneration. In vitro cell experiments indicated that the multi-channel electroactive NGC not only promoted the proliferation, maturation and myelination of Schwann cells (SCs), but also effectively promoted neuronal differentiation and axonal regeneration of Pheochromocytoma 12 (PC12) cells. Furthermore, a rat sciatic nerve defect model was constructed to evaluate the effect of multi-channel electroactive NGC on peripheral nerve repair and the results showed that electroactive NGC could significantly promote peripheral nerve regeneration and functional recovery after 12 weeks, achieving the repair effect of autografts through the positive synergistic effect of piezoelectric and conductive properties of NGC. These results demonstrated the great potential of multi-channel electroactive NGCs in repairing peripheral nerve injury (PNI).
研究领域:
生物医学工程
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组织工程
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神经科学
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材料科学
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
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2018
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IF 3.927
Hailong Liu,Xiangjun Liao
The effects of additive, fluorocarbon special surfactant (FS-30), on the mechanism of phase inversion, morphology and separation performance of the PVDF membranes formed by non-solvent induced phase inversion (NIPS) method from the PVDF/LiCl/FS-30/DMAc system were investigated. The addition of FS-30 significantly improved membrane performance and achieved a simultaneous increase in the pure water flux and BSA rejection of the membrane, which was of great value for membrane application. With the addition of FS-30, the pure water flux increased from 114.68 LMH of the original membrane M0 to 393.76 LMH of the blend membrane M7. At the same time, the BSA rejection rate of the membrane was also increased continuously when the FS-30 content was less than 5 wt% and reached 99.48% at M5. The change in membrane properties can be attributed to the phase inversion process as well as the morphological structural features of the membrane. The addition of FS-30 increased the porosity and improved the hydrophilicity of the membrane by 28.06%. However, the average pore diameter of the membrane was reduced from 0.339 μm to 0.241 μm and a special “stage pore” structure was produced due to the unique properties of FS-30. Fourier transform infrared (FTIR) spectroscopy and X-ray diffraction (XRD) imaging showed that FS-30 was lost during the coagulation bath and did not remain on the membrane, but affected the crystal composition of the α-phase and β-phase in PVDF membrane as well as promoted the phase inversion process to instantaneous phase separation. Meanwhile, the effect of FS-30 on the morphology of the membrane was characterized by scanning electron microscopy (SEM), and the morphological changes of the membrane was analyzed from the aspects of thermodynamics and kinetics of the casting solution in combination with the phase inversion process of the membrane. It was found that the influence of FS-30 on the kinetics of the casting solution did not balance the effect on the thermodynamic instability, and the thermodynamic effect still dominated, making the FS-30 blend membrane have a more obvious asymmetric structure. Moreover, the effect of the blend membrane on the rejection of algae in surface water and bacteria in sewage was also characterized with the help of chlorophyll fluorescence technique and bacterial inoculation culture experiments respectively, and the result confirmed that the FS-30/PVDF membranes had excellent properties.
研究领域:
材料科学
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化学工程
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环境科学
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膜技术
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
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2023
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IF 15.1
Minhui Liao,Yang Zhou,Xunchang Jiang,Renjie Wan
High safety, high ion conductivity, and stable interface contacts are of significant importance for the application of solid-state electrolytes (SSEs) in solid-state lithium metal batteries (SSLMBs). In this study, SSEs with high ion conductivity and safety were constructed by in-situ polymerization of poly butyl acrylate (PBA) based electrolytes in the three-dimensional (3D) pores of a polyvinylidene fluoride (PVDF) nanofiber membrane, and embedded with ion conductor succinonitrile (SN), fluorinated ethylene carbonate (FEC), and imidazolium-based ionic liquid (IL). The test results and microscopic structural analysis indicate that SN is uniformly dispersed in PVDF, effectively reducing the crystallinity of solid polymer electrolytes (SPEs) and constructing a 3D interconnected lithium-ion conduction network. Consequently, an ion conductivity of 4.89 mS cm −1 was achieved at 25°C. Meanwhile, density functional theory (DFT) calculations demonstrated that imidazolium-based ionic liquid can adjust the dissolution characteristics of Li + through weak interactions with the polymer framework and strong coordination with TFSI - . X-ray photoelectron spectroscopy (XPS) characterization revealed that the imidazolium-based ionic liquid can form a stable solid electrolyte interface enriched with Li 3 N on the lithium-metal surface. The resulting SPEs demonstrated excellent ion conductivity, a high Li + transfer number (t Li + = 0.739), and a nanofiber-reinforced interpenetrating framework with a tensile strength of 17.15 MPa. Furthermore, the LiFePO 4 (LFP)||Li battery equipped with PBA-PVDF-SN (modified with IL) exhibited excellent electrochemical performance at room temperature with a capacity retention of 87.4 % after 800 cycles at 0.5C.
研究领域:
材料科学
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电化学
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电池技术
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聚合物化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）