RSC Advances
·
2016
·Vol. 6
·期 20
·16452-16460
·
IF 3.289
Jie Chen,Ye Sheng,Xiuqing Zhou,Murad M. A. Abualrejal,Meiqi Chang,Zhan Shi,Haifeng Zou
Luminescent one-dimensional Eu3+ doped SiO2 fibers have been readily prepared by electrospinning method combined with a sol–gel process. In this work, polyvinylpyrrolidone (PVP) as a simple commercial dendrimer not only increased the viscosity of solution but also provided weak hydrogen bonds with silica, which was significant in improving the electrospinability. The scanning electron microscopy (SEM) and transmission electron microscopy (TEM) showed that the as-obtained samples present fiber-like morphology with uniform size and the diameters of fibers became wider with the increase of Eu3+ concentration, from nanoscale to microscale. The X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and X-ray photoelectron spectroscopy (XPS) indicated that Eu3+ activator ions have been doped into the interstitial sites of SiO2 fibers through the electrostatic interaction, which would reduce the symmetry of SiO2 framework. The photoluminescence (PL) properties include the diffuse reflectance, excitation and emission spectra indicated that the obtained SiO2:Eu3+ fibers exhibited typical Eu3+ (5D0–7FJ) red emission under ultraviolet excitation and the band energy was changed due to the doping of stable Eu3+ activator ions. Meanwhile, the concentration quenching effects and decay kinetics behaviors of SiO2:Eu3+ fibers were investigated and the optimal doping concentration and the longest lifetime were both in the composition of 16 mol% Eu3+. In addition, the energy-dispersive X-ray spectrum (EDS), thermogravimetry differential thermal analysis (TG-DTA) and the formation mechanism were also displayed in order to better understand the work.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2017
·
IF 2.986
Jianjun Li,Yanfeng Wu,Jungang Cao,Zhonglin Wei,Ying Guo,Qun Wang,Qingyu Peng,Yibin Li,Xiaodong He
In this paper, SiO 2 -TiO 2 hybrid fibres are fabricated using the electrospinning technique and Eu 3+ is successfully doped into the fibres through a simple sol-gel approach. The obtained SiO 2 -TiO 2 hybrid fibres are subjected to heat treatments at 600 °C, 800 °C and 1200 °C. The silica fibres subjected to a high temperature of 1200 °C become brittle and easily broken. Furthermore, the X-ray diffraction patterns demonstrate that crystalline titania forms in the SiO 2 -TiO 2 samples treated at 1200 °C, and excellent flexibility is demonstrated in the corresponding SiO 2 -TiO 2 non-woven mat. Moreover, the stress-strain curve demonstrates that the SiO 2 -TiO 2 mat heat-treated at 1200 °C exhibits typical elastic-plastic behaviour. Finally, the emission intensity of Eu 3+ of the SiO 2 -TiO 2 fibres is higher than that of the analogous SiO 2 fibres. This method can be adapted to fabricate inorganic-based hybrid fibres and will pave the way for the implementation of SiO 2 -TiO 2 non-woven mats in related research fields.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2023
·
IF 8.6
Junyu Li,Lin zhu,Chenhui Yan,Zhiwei Mou,Zhenghan Wang,Shiyi Wei,Yangfan Su,Yuxuan Chen,Zhengguo Chen,Xiaoan Li,Tao Duan,Jiehong Lei
Because of their non-toxicity and low cost, bismuth-based materials have received considerable attention for the capture of gaseous iodine, especially for the removal of radioactive iodine in nuclear post-processing plants. In the actual operation conditions of reprocessing plant, the presence of water vapor must be considered as an important factor because it will significantly affect the iodine capturing efficiency for most iodine-capturing materials. To address this problem, we successfully synthesized a hydrophobic bismuth-based chrysotile membrane, which was modified by the silane coupling agent KH570. The chrysotile fiber was chosen to provide rich reactive sites for bismuth loading, and the bismuth was chosen due to its high affinity to iodine. The hydrophobic surface endowed by KH570 acts as a ‘protecting layer’ when water vapor exists during iodine adsorption. The maximum of iodine capture efficiency of the prepared membrane reached 483.37 mg/g in air, and 443.04 mg/g under 75 % relative humidity. Comparing hydrophobic membrane with one that non-modified by KH570, the hydrophobic membrane increases about 54 % iodine adsorption capacity in humid condition. This study provides a certain reference value for the application of bismuth-based materials in iodine removal under humid conditions.
研究领域:
化学工程
·
核能科学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER COMPOSITES
·
2022
·Vol. 43
·期 5
·2896-2908
·
IF 3.531
Shuai Shen,Hongbin Guo,Xiaoyan Ma,Xutao Ma,Zhaoqi Niu,Yi Xin,Xiao Hou
To further improve the ablation and thermal properties of silicon rubber composite materials, the 3, 13-divinyloctaphenyl double-decker polyhedral oligomeric silsesquioxane (DV-DDSQ) modified additional vinyl-terminated polydimethylsiloxane (VPDMS) was prepared, and the effect of high silica fiber reinforcement on the ablation properties of VPDMS was investigated. The results show that when 0.8phr DV-DDSQ was added, the mass residual rate at 800°C of the composites increased from 40.6% to 51.0%. The linear ablation rate (LAR) as well as mass ablation rate (MAR) of the composites of the DV-DDSQ modified VPDMS, the high silica fiber reinforced VPDMS composite (HSF/VPDMS composite) and the high silica fiber reinforced DV-DDSQ modified VPDMS composite (HSF/DV-DDSQ-VPDMS composite) decreased dramatically compared with raw VPDMS, and it was 16.36%, 35.69%, and 37.17% bring down for LAR and 5.34%, 14.60% and 25.59% for MAR, respectively. The tensile strength and hardness of the DV-DDSQ modified composites increased by 9.52% and 14.13%, respectively, while the elongation at break decreased by 5.99%, compared with the raw VPDMS.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
APPLIED ENERGY
·
2024
·
IF 10.1
Fen Liu,Na Yang,Weihua Li,Fuqiang Wang,Lizhong Yang,Hui Liu,Qian Du,Alessandro Romagnoli,Jianfeng Wang
The safety of Li-ion batteries in extreme environments (low or high temperature) is the first issue to be solved in the development, and passive thermal protection is the most cost-effective approach. Conventional aerogel insulation needs to solve the application's problem of falling powder and bending problem. We prepared a hollow SiO 2 protection film inspired by polar bear hollow hairs using the electrostatic spinning microemulsion method without complex coaxial spinning needles. We tested the thermal stability, insulation performance, mechanical properties, and bending fatigue of the insulation film and discovered that this lightweight hollow SiO 2 fiber film had low thermal conductivity and remained flexible. The temperature reduction of front and back the fiber membrane reached 82.9 % for the battery module 3C overcharge thermal runaway, which successfully prevented explosion spread. Also the bionic insulation could protect battery performance at low temperature, which had a positive effect on solving the battery safety problem in extreme environments.
研究领域:
材料科学
·
能源技术
·
仿生学
✓ 已验证
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2025
·
IF 13.2
Shuangqing Li,Xueke Jiao,Lili Chai,Zihan Su,Yushun Yang,Yafei Zhao,Yinze Yang,Dan Wang,Huishan Shang,Bing Zhang
Developing highly effective phase change composites (PCMs) featuring remarkable encapsulation, energy storage, conversion and management performance is of important significance for the practical utilization of organic solid-liquid PCMs. Herein, a secondary hierarchical structure (NSH) was constructed in nickel foam (NF) with silica fiber as scaffold for supporting halloysite (HNT) with polypyrrole (PPy) modification (HNT/PPy). The introduced HNT/PPy can narrow the pore size, intensify the optical absorption, and enhance the thermal and electrical conductivity of NF, while the inserted silica fiber network can prevent HNT/PPy with small particles to drop in the pores of the NF. When polyethylene glycol (PEG) is encapsulated in the NSH, the as-prepared PEG@NSH reveals an ultrahigh encapsulation rate (up to 87 % package), good shape stability (without any leakage at 100 °C with 82 % encapsulation) and excellent solar-thermal conversion capability (93 % of absorption rate, and 95.39 % of photothermal conversion efficiency). Meanwhile, the PEG@NSH also displays a significantly improved thermal conductivity (455 % of pure PEG). Combined the PEG@NSH composite with solar-thermal-electricity (STE) conversion device, efficient and stable voltage output of 907 mV and current output of 139.8 mA can be achieved at 3kW m −2 of light intensity. This work offers a straightforward construction approach for effective package of PCMs and efficient solar-thermal-electric energy conversion and management.
研究领域:
材料科学
·
能源工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
Advanced Healthcare Materials
·
2025
·
IF 9.6
Xinyi Wang,Zhengchao Yuan,Guangfang Cai,Yifan Lu,Shasha Zhou,Panpan Shang,Cheng Li,Zewen Wang,Zhenchao Liu,Muhammad Shafiq,Mohamed EL-Newehy,Meera Moydeen Abdulhameed,Xiao Lu,Yuan Xu,Xiumei Mo
Bone tissue engineering is a critical area of research focused on enhancing the regeneration of bone tissue, particularly in cases of complex defects. Despite inherent self-healing capabilities of bone, irregularly-shaped defects pose significant challenges for complete regeneration, thereby necessitating innovative therapeutic strategies. This study addresses these challenges by exploring the development of advanced tissue regeneration scaffolds. Here, tricalcium phosphate (TCP) is integrated with short silica (SiO 2 ) fibers to develop 3D cryogel scaffolds, designated as SSFx@TCP. These cryogel scaffolds exhibit low density (<2 mg cm − 3 ), high water absorption (>3500%), and favorable sustained release properties, enabling effective cellular interactions. Notably, the SSFx@TCP cryogels support cell attachment, proliferation, and differentiation, while also regulate gene expression associated with angiogenesis and osteogenesis. Furthermore, in vivo assays demonstrated that these scaffolds can effectively promote de novo bone production in a rat calvarial defect model 8 weeks post-operatively, thereby indicating their potential to mimic the natural extracellular matrix. The successful integration of bioactive components in these cryogels may be beneficial for improved clinical outcomes in bone regeneration therapies and ultimately enhancing patient care in reconstructive surgery.
研究领域:
生物材料学
·
再生医学
·
骨科
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CERAMICS INTERNATIONAL
·
2019
·
IF 3.45
Ben Huang,Zhengqin Wang,Hailong Hu,Xiu-ZhiTang,Xiaozhong Huang,Jianling Yue,Yi Wang
The employment of coating technique on the silicon carbide fibers plays a pivotal role in preparing SiC fiber-reinforced SiC composites (SiC f /SiC) toward electromagnetic wave absorption applications. In this work, SiC nanowires (SiCNWs) are successfully deposited onto the pyrolytic carbon (PyC) coated SiC fibers by an electrophoretic deposition method, and subsequently densified by chemical vapor infiltration to obtain SiCNWs/PyC-SiC f /SiC composites. The results reveal that the introduction of SiCNWs could markedly enhance the microwave absorption properties of PyC-SiC f /SiC composites. Owing to the increasing of SiCNWs loading, the minimum reflection loss of composites raises up to −58.5 dB in the SiCNWs/PyC-SiC f /SiC composites with an effective absorption bandwidth (reflection loss ≤ −10 dB) of 6.13 GHz. The remarkable enhancement of electromagnetic wave absorption performances is mainly attributed to the improved dielectric loss ability, impedance matching and multiple reflections. This work provides a novel strategy in preparing SiC f /SiC composites with excellent electromagnetic wave absorption properties.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
POLYMER
·
2019
·
IF 3.771
Guoqin Leng,Xiaoguang Zhang,Tengteng Shi,Guo Chen,Xiaowen Wu,Yangai Liu,Minghao Fang,Xin Min,Zhaohui Huang
Centrifugal spinning has recently attracted attention as a safer and more efficient method for preparing polymer micro- and nano-fibres. Our research demonstrates the successful preparation of polystyrene (PS) flexible thermal insulation materials by innovatively spinning PS into fibres. The morphology and size of the fibres were characterised by scanning electron microscopy (SEM). The average diameter of PS fibres decreased from 3.76 μm to 1.31 μm after the addition of nano-SiO 2 . The hydrophobicity and contact angle of PS/SiO 2 composite fibres with water was measured by video water contact angle measuring instrument to be 141°. The results demonstrated that the PS/SiO 2 composite fibres were completely stable at or below 300 °C and had a moisture content less than 0.26%. Based on the properties of the fibres, PS/SiO 2 composite fibres have the potential to become a new type of building insulation materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Ying Mu,Liwen Yan,Peisen Liu,Qichao Gao,Anran Guo,Xiaojing Xu,Haiyan Du,Shun Dong,Jiachen Liu
As a critical structure of thermal protection systems, flexible fibre insulation felts are widely used on the leeward surface of spacecrafts. To enhance the thermal resistance of flexible fibre felts, SiC w -ZrO 2 coatings with different SiC whisker (SiC w ) contents were fabricated on the surface of a high-silica-fibre fabric (HSFF) by employing a sol-gel method combined with a spraying route. The introduction of SiC w having a length of 10–50 μm effectively improved the coating integrity. After calcination at 1000 °C for 1 h, the SiC w -ZrO 2 coating containing 8 wt% SiC w did not damage the tensile strength and flexibility of the fibre fabric, and the interfacial bonding strength between the coating and HSFF reached 0.40 MPa, benefitting from the whisker toughening mechanism. The SiC w -ZrO 2 coating with a high emissivity of 0.96 in the 2–14 μm wavelength range reduced the surface temperature of the flexible insulation felt by approximately 300 °C when a butane torch was applied at above 1300 °C.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2011
·Vol. 1
·期 8
·1482-1488
·
IF 0
Fan Zhao,Xianfeng Wang,Bin Ding,Jinyou Lin,Juanping Hu,Yang Si,Jianyong Yu,Gang Sun
Inspired by the self-cleaning lotus leaf, here we report the fabrication of flexible fluorinated silica nanofibrous membranes with biomimetic non-wettable surfaces by electrospinning blend solutions of poly(vinyl alcohol) (PVA) and silica gel in the presence of silica nanoparticles, followed by calcination and fluoroalkylsilane (FAS) modification. The resultant silica nanofibers exhibited a lotus-leaf-like structure with numerous nanoparticles decorated on the fiber surfaces due to the rapid phase separation in electrospinning and calcination processing. The content of silica nanoparticles incorporated into the fibers proved to be the key factor affecting the fiber surface morphology and wettability. The fluorinated silica fibrous membranes containing 38.8 wt% silica nanoparticle showed the highest water contact angle (WCA) of 155°, oil contact angle (OCA) of 143°, orange juice contact angle (OJCA) of 142°, and milk contact angle (MCA) of 137°. Additionally, the fluorinated silica membranes exhibited good flexibility and the flexibility was also characterized by KES-FB2S. We believe that this new class of inorganic membranes is particularly promising for the development of high-temperature filtration, novel easy-clean coatings, and even flexible electronics.
研究领域:
材料科学
·
仿生学
·
表面科学
✓ 已验证
DOI
MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2017
·
IF 3.094
Shuang Yi,Shubin Wang,Huiyu Yang
To improve the strong interface between fibers and ceramic matrix in silicon carbide (SiC) fibers reinforced in ceramic matrix composites (CMCs), tremendous efforts have been devoted to the fabrication of fiber coating. However, the design and preparation of these fiber coatings still remain a considerable challenge. In this study, we report a novel strategy to synthesize foldcore sandwich structure formed by boron nitride (BN)-coated graphene nanosheets (GNS) grafted to SiC fibers and analyze how the presence of GNS/BN composite coatings influences the mechanical performance of the fibers. In the fracture process, GNS-grafted SiC fibers coated with BN provide a specific wrinkled and malleable surface, which can be flattened and then broken in the early fracture stage. As a result, the fracture process is changed, resulting in enhanced mechanical performance. Our strategy could be further extended to the fabrication of other composite coatings on fibers with enhanced mechanical properties .
研究领域:
材料科学
·
力学工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）