CERAMICS INTERNATIONAL
·
2024
·
IF 5.1
Dapeng Gu,Guanqun Wang,Suwen Chen,Hongtao Luo,Xiaofan Chen,Ziyu Liu
The traditional high-temperature sintering method cannot achieve the combination of ceramics and polymers for the huge sintering temperature difference. The insufficient interfacial bonding strength of the ceramic matrix is the difficulty in the low-temperature preparation of ceramic-polymer composites. To improve the interfacial bonding strength of Si 3 N 4 (Silicon nitride) ceramic matrix composite, an easy-bonding SiO 2 (Silica) shell was introduced onto the surface of the hard-bonding Si 3 N 4 core by Stober method, to obtain Si 3 N 4 @SiO 2 composite. Si 3 N 4 @SiO 2 /PEEK (Polyetheretherketone) composites were prepared by the cold sintering process (500 MPa, 240 °C, and transient liquid phase is NaOH solution). The dry tribological properties of Si 3 N 4 @SiO 2 /PEEK composites with different PEEK percentages were studied by a ball-disc contact form. It is shown that an amorphous SiO 2 shell with a thickness of 25 nm is chemically bonded onto the surface of the Si 3 N 4 core. The presence of the SiO 2 shell improves the interface bonding strength between Si 3 N 4 ceramic particles. The friction coefficients of Si 3 N 4 @SiO 2 /PEEK composites decrease with the increase of PEEK percentage. Compared with Si 3 N 4 @SiO 2 composite, the friction coefficient and wear rate of Si 3 N 4 @SiO 2 /50 vol% PEEK composite decrease by about 40% and 26%, respectively. The main wear forms of Si 3 N 4 @SiO 2 /PEEK composites are abrasive wear and adhesive wear. A mixed lubrication layer, mainly including PEEK, Si 3 N 4 , and SiO 2 , exists simultaneously on the surfaces of Si 3 N 4 @SiO 2 /PEEK composite and the counterpart ball, respectively, playing the role of reducing friction and wear.
研究领域:
材料科学
·
机械工程
✓ 已验证
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Qiang Zhang,Zhongtian Yang,Yage Xia,Junxu Chen,Yanzheng Ji,Juan Li,Huimin Liu,Xinquan Yu,Youfa Zhang
Slippery liquid-infused porous surfaces (SLIPS) have excellent hydrophobicity, low adhesion, and self-healing, showing potential applications prospects in the fields of self-cleaning, anti-corrosion, anti-biofouling, and drag reduction. However, the current SLIPS surface has problems such as complicated preparation process and easy loss of lubricant, which seriously restricts its practical application. In this paper, hydrophobic modified superhydrophobic diatomaceous earth@SiO 2 cell loaded with silicone oil were firstly prepared, and then mixed with polyurea resin and curing agent to prepare a novel slippery lubricated oil-infused anti-corrosion and anti-fouling polyurea coating (SLIC).The impedance modulus (|Z| 0.01 Hz ) of the SLIC-coated Q235B steel plate in simulated seawater (3.5 wt% NaCl aqueous solution) reaches 10 10 Ω·cm 2 order of magnitude; Additionally, the glass samples coated with SLIC coatings showed only 0.18 % bacteria coverage rate after 72 hours of incubation in E. coli culture solution, and only 0.10 %, 0.29 % and 0.53 % coverage of Chlorella after 5, 10 and 15 days of incubation in Chlorella culture solution. The SLIC coatings are also simple to prepare, low-cost, and versatile, with excellent robustness, durability and self-cleaning, thereby presenting potential application prospects in the fields of ships and marine engineering.
研究领域:
材料科学
·
海洋工程
·
生物学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF APPLIED POLYMER SCIENCE
·
2019
·Vol. 137
·期 24
·48804
·
IF 2.188
Yan Feng,Runjun Sun,Chengkun Liu,Meiyu Chen,Qiushi Wang
The electrospun polyamide 6 (PA6) membranes are treated with different methods. The rough surfaces with different protuberances size and the fiber diameter are prepared by wet, dry heat, wet heat, and ethanol treatments under relaxation, and the formation mechanisms are analyzed. A relative stable structure of PA6 membrane is also prepared by ethanol treatment under tension, and its structure is as same as the untreated membrane. The dynamic water contact angles (WCAs) of the treated membranes are measured. The starting WCA of the membrane with wet heat treatment under relaxation is 90.95°, which is larger than those of wet, dry heat, and ethanol treatments under relaxation. The effects of surface morphologies with different treatments on wettability are analyzed. For obtaining hydrophobicity, the membrane with wet heat treatment under relaxation was coated by polyvinylidene fluoride (PVDF). The WCA of the membrane increases to 127.1° after coating. From another point of view, the WCA of the PVDF/treated PA6 membrane is much larger than that of the pure casting PVDF membrane, which means the rough surface of the treated PA6 membrane can improve the hydrophobicity of the PVDF membrane. Furthermore, the membrane is endowed with superhydrophobicity (WCA of 153.5°) after being coated by SiO 2 /PVDF due to the multilevel structured surface roughness. It is a relative low cost and convenient operation method to prepare the superhydrophobic material. The results provide a novel preparation method of the superhydrophobic material and a treatment method of the electrospun PA6 membrane to obtain a stable structure. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020 , 137 , 48804.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 7
·1-11
·
IF 2.8
Feng Jingmin,Zhang Yajuan,Lu Yang,Shan Yiting,Guo Xiang,Zhou Hongqing
In this study, CaO–B 2 O 3 –SiO 2 (CBS) glass–ceramics were prepared and compounded with different contents of ZrSiO 4 . The sintering behavior, phase composition, microstructure, dielectric properties, thermal properties, and mechanical properties of this CBS glass–ceramic composite ZrSiO 4 ceramic system were investigated. The results show that CBS glass–ceramic can be sintered densely at 750 °C. However, the crystallinity is unexpectedly low and the dielectric properties are greatly damaged. Surprisingly, the addition of ZrSiO 4 improved the dielectric constant of the composites and achieved a dielectric adjustable in the range of 6.0–7.8. When the composite was sintered at 830 °C for 15 min with 35% ZrSiO 4 addition, the bulk density of the composite increased to 2.93 g/cm 3 . The dielectric constant measured at a high frequency of 13 GHz was 6.93 and the dielectric loss of 1.66 × 10 –3 . Accordingly, the addition of ZrSiO 4 reduced the thermal expansion coefficient of the composite to 6.1 ppm/°C and increased the flexural strength of the composite to 248 MPa.
研究领域:
材料科学
·
电子工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2023
·
IF 5.7
Le Fu,Bohan Wang,Yabin Zhu,Tielong Shen,Ying Deng,Guofu Xu,Jiwu Huang,Yucheng Feng,Liangting Sun,Wei Xia
Developing new radiation-resistant materials and understanding the structural damages caused by radiation are persistent goals of material scientists. Here, we report on the structural integrity and damage to ZrO 2 -SiO 2 nanocrystalline glass-ceramics after radiation with 1.4 MeV He ions at three different fluences: 1.0 × 10 16 ions/cm 2 (low), 5.0 × 10 16 ions/cm 2 (moderate), and 1.0 × 10 17 ions/cm 2 (high) at 500 °C. Grazing incident X-ray diffraction shows the tetragonal-ZrO 2 to monoclinic-ZrO 2 phase transformation induced by microstrain from the irradiation. The addition of yttrium indicated tetragonal-ZrO 2 stabilization effect during irradiation. The irradiated glass-ceramics show a Raman signal-enhancement effect probably related to the electronic structure changes of the amorphous SiO 2 component in the glass-ceramics. The formation of microcracks and lattice defects within ZrO 2 nanocrystallites is the main structural damage caused by irradiation. There was no observable amorphization of ZrO 2 nanocrystallites due to irradiation. No obvious He bubbles were detected, either. The formation of microcracks results in a decrease of in the nanohardness of the glass-ceramics. The results provide fundamental experimental data to understand the structural integrity and damage caused by radiation, which could be useful to design radiation‐resistant nanocrystalline glass-ceramics for extremely radioactive environments.
研究领域:
材料科学
·
核能工程
✓ 已验证
DOI
高影响因子
SEPARATION AND PURIFICATION TECHNOLOGY
·
2020
·
IF 5.774
Jinxin Xie,Weirui Chen,Yanfeng Lv,Haoyao Chen,Xukai Li,Laisheng Li
In this work, a hollow mesoporous CeO x @SiO 2 was synthesized and used to promote sulfanilamide (SA) mineralization in ozonation . SA mineralization was promoted to 68.2% by O 3 /CeO x @SiO 2 in 120 min, but only 30.0% in O 3 process. O 3 /CeO x @SiO 2 behaved the better at acidic and alkaline condition than that at neutral condition. CeO x @SiO 2 had the great ability in enhancing O 3 utility rate. Silanol (Si OH) in pore channel of SiO 2 shell was non-reactive with O 3 but could provide transmission way for O 3 to reach the inner CeO x core. Lewis sites, oxygen vacancies and surface hydroxyl groups induced by CeO x favored for the activation of O 3 . The excess electron at oxygen vacancies would be transferred to the absorbed O 3 molecular, which then generated reactive oxygen species (ROS) to mineralize SA. Hydroxyl radicals ( OH) and superoxide radicals ( O 2 − ) were the main ROS, which were recorded by EPR. The interfacial electron transfer process was revealed by LSV and ESI characterizations. SA degradation intermediates were also identified by HPLC-MS and IC, a possible degradation pathway was proposed. Moreover, CeO x @SiO 2 showed a good reusability, no obvious decline of TOC removal was found in four times’ uses. Water matrix would complete ROS with SA, which inhibited the SA removal of both O 3 and O 3 /CeO x @SiO 2 processes, but the better TOC removal efficiency was still obtained by O 3 /CeO x @SiO 2 in actual water.
研究领域:
环境科学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2020
·
IF 6.155
Wenzhi Li,Lihong Gao,Zhuang Ma,Yanbo Liu,Fuchi Wang,Jiawei Wang,Lijun Wang,Hezhang Li
Faced with the challenge of high energy ablation problems, especially for laser ablation , effective energy dissipation protective materials fabricate by efficient preparation method is a feasible solution. The Ni-graphite/SiO 2 coatings with different Ni content were prepared by plasma spraying method with optimized plasma spraying parameters. All coatings are pure without oxidation and dense. Their ablation behaviors were investigated by high power continuous wave laser. The results indicate that the Ni-graphite/SiO 2 coating with appropriate Ni content could realize the purpose of energy consumption by endothermal reaction of graphite/SiO 2 and reflection improvement. High Ni content will block the occurrence of endothermal reaction of graphite/SiO 2 and increase the heat diffusion to interior part of coating, which can make the ablation situation of coating more serious.
研究领域:
材料科学
·
激光技术
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 15
·1-18
·
IF 2.8
Ji Xiaoli,Qiao Ruochen,Xu Zhihao,Liu Jian,Ma Qianqian,Yuan Haoze,Xing Honglong
Fe 3 O 4 /SiO 2 nanocomposites (NCs) were prepared by the interaction of alkyne-functionalized ferric oxide (Fe 3 O 4 -Alk) nanoparticles (NPs) and azide-functionalized silicon dioxide (SiO 2 -N 3 ) NPs via the click reaction. The morphology and structure of the Fe 3 O 4 /SiO 2 NCs were investigated using scanning electron microscopy, X-ray photoelectron spectroscopy, X-ray diffraction, and infrared analyses, and the electromagnetic parameters were measured using a vector network analyzer. For the Fe 3 O 4 /SiO 2 nanocomposites obtained via the click reaction, the minimum reflection loss reached − 37.15 dB at 16.68 GHz and a matching thickness of 5.0 mm, and the bandwidth below − 10 dB ranged from 3.2 to 6.7 GHz and 15.7 to 17.6 GHz. The Fe 3 O 4 /SiO 2 composites synthesized via the click reaction exhibited better microwave absorption performance than the physically blended sample. This is mainly because Fe 3 O 4 and SiO 2 are covalently bonded through the click reaction in the composites, creating multiple heterogeneous interfaces, which enhance dielectric loss and impedance matching.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
RSC Advances
·
2015
·Vol. 5
·期 34
·27097-27106
·
IF 3.84
Guiying Wu,Xin He,Li Xu,Houjin Zhang,Yunjun Yan
Novel Sapium sebiferum oil-based polyurethane (PU) nanocomposites with different contents of nano-SiO2 were successfully synthesized via an in situ polymerization method. Firstly, Sapium sebiferum polyol (SSP) was prepared in a continuous two-step process of epoxidation and hydroxylation, and nano-SiO2 particles were modified with 3-aminopropyltriethoxysilane (AMEO). Furthermore, SSP and isophorone diisocyanate (IPDI) reacted with a certain amount of the modified nano-SiO2 to enhance the physical properties of PU nanocomposites. The characterization of the structure and the properties of the surface modified nano-SiO2 and the PU/SiO2 nanocomposites were analyzed by Fourier transform infrared (FTIR), thermogravimetric analysis (TGA), solid-state 29Si nuclear magnetic resonance (NMR), scanning electron microscopy (SEM) and differential scanning calorimetry (DSC). The results demonstrate that nano-SiO2 particles can be homogeneously dispersed in the PU matrix with a loading amount less than 5 wt%. Compared with the pure PU, the glass transition temperatures and initial decomposition temperatures of the PU/SiO2 nanocomposites were respectively enhanced by 20.5 °C and 43.5 °C with 3 wt% nano-SiO2 content. Moreover, the tensile strength of the PU/SiO2 nanocomposites was improved at 170%, and the water and toluene resistance properties of PU/SiO2 were also significantly enhanced.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2016
·
IF 3.897
Shiwen Yang,Jiacheng Liu,Fei Pan,Xianze Yin,Luoxin Wang,Dongzhi Chen,Yingshan Zhou,Chuanxi Xiong,Hua Wang
Functionalized liquid-like graphene@SiO 2 hybrids are fabricated by using the graphene@SiO 2 as core and nonionic copolymer as shell in aqueous solution at room temperature. The hybrid materials can flow above 45 °C and have a particular thermal invertibility . The morphology, chemical composition, dispersibility and stability, as well as rheological behavior are systematically characterized by various methods. It is shown that well-dispersed SiO 2 nanoparticles are tightly anchored on the surface of graphene sheet via hydrogen bonding interaction under the synergetic effect of 3-(trimethoxysilyl)-1-propanethiol and copolymer to prevent the aggregation of graphene sheet . What is more, the hybrid materials keep remarkably stability and dispersibility in organic solvents and aqueous solution. More importantly, rheological tests indicate that viscoelastic behavior of graphene@SiO 2 hybrids is effectively regulated through varying the amount of surface nonionic copolymer and silane coupling agent, respectively. In addition, the liquid-like graphene@SiO 2 hybrids as a novel of hybrid coating make the substrates transfer from hydrophobicity to hydrophilicity . More interestingly, the damaged coating can be self-healed under immersing water or heating conditions, respectively. This simple and environment friendly approach will benefit for fabricating large scale graphene based hybrid materials in application of functional coating and rheological additives.
研究领域:
材料科学
·
表面化学
✓ 已验证
DOI
高影响因子
WATER ENVIRONMENT RESEARCH
·
2021
·Vol. 93
·期 12
·2903-2913
·
IF 1.946
Pan Xiong,Siqi Fan,Jinshan Song,Qizhou Dai
In this study, a magnetic nanocatalyst (Fe 3 O 4 @SiO 2 @CeO 2 ) was prepared and applied in the catalytic ozonation of methyldopa (MD). The effects of operational parameters on catalytic ozonation performance were investigated, including ozone dosage, catalyst dosage, initial MD concentration, and pH. The removal of MD was 45.2% in ozonation, whereas the efficiency was achieved to 83.0% with the addition of Fe 3 O 4 @SiO 2 @CeO 2 . The results showed that Fe 3 O 4 @SiO 2 @CeO 2 could significantly improve the catalytic ozonation performance. And the enhanced mechanism study showed that it was attributed to promotion of ozone decomposition to generate hydroxyl radical. The reaction model was explored, and the reaction rates were calculated for the MD degradation in catalytic ozonation. A higher degradation efficiency of MD in catalytic ozonation was attributed to the enhanced surface effect of the catalysts, which was confirmed by using TBA, PO 4 3− , and p -BQ as scavengers of hydroxyl radical, surface reaction, and superoxide radical. The hydroxyl radical and superoxide radical played an important role in the degradation of MD. The mechanism of catalytic ozonation by Fe 3 O 4 @SiO 2 @CeO 2 was discussed via X-ray photoelectron spectroscopy (XPS) spectra and experimental data. Practitioner Points Fe 3 O 4 @SiO 2 @CeO 2 could promote the decomposition of ozone to produce hydroxyl radicals. High degradation efficiency of methyldopa with Fe 3 O 4 @SiO 2 @CeO 2 was achieved. A mechanism of catalytic ozonation with Fe 3 O 4 @SiO 2 @CeO 2 was proposed.
研究领域:
环境科学
·
化学工程
·
药学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PROCESS BIOCHEMISTRY
·
2019
·
IF 2.883
Bin Zou,Pengyun Wang,Zhenjiang Liu,Jiaojiao Xia,baihan Chen,Zhiyuan Tan
2,5-Furandicarboxylic acid (FDCA) has the potential to replace terephthalic acid (TPA) as a building block in the preparation of bio-based and degradable polyester materials. However, the lack of efficient and stable catalysts limits the commercial viability of FDCA production. In this work, metalloporphyrins were immobilized on mesoporous SiO 2 and used as a novel oxidase to convert 5-hydroxymethylfurfural (HMF) to FDCA. As the catalytic active center of P450 monooxygenases and horseradish peroxidase, supported palladium, manganese, ferri, and cobalt porphyrins via ionic-liquid-functionalized SiO 2 (PdPOP-SiO 2 , MgPOP-SiO 2 , FePOP-SiO 2 and CoPOP-SiO 2 ) were able to simulate oxidase alone under mild conditions. 100% HMF (0.02 M) conversion and 94.94% FDCA yield were achieved using PdPOP-SiO 2 as a biomimetic oxidase after a 12 h reaction at 373 K in water at atmospheric pressure. This type of mimetic oxidase is stable, inexpensive, and readily available, and the method developed in this work can potentially be used to oxidize HMF to FDCA in an industrial setting.
研究领域:
化学工程
·
生物催化
·
材料科学
✓ 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）