JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2025
·
IF 6.2
Hao Zhang,Zhen Teng,Yiwang Bao,Man Jiang,Qingguo Feng,Chunfeng Hu
Oxide ceramic aerogels, one of the most important aerogels, hold significant application promise in thermal insulation and protection. However, their low strength, long preparation cycle, and supercritical drying dependence hinder their widespread use. In this study, we proposed a hybrid interpenetrating network strategy and prepared a hybrid Al 2 O 3 -SiO 2 aerogel (PAS) via ambient pressure drying. The structures, mechanical properties, thermal insulation performance, and mechanisms of PAS were systematically investigated. PAS exhibited remarkably low drying linear shrinkage (6.08%), substantially compressive strength (8.05 MPa), and impressive strain capacity (45%). Furthermore, PAS demonstrated exceptional thermal insulation (0.039 W/m·K at 25°C) and high-temperature structural stability. Mechanistic studies revealed that the hybrid interpenetrating network significantly reinforced the Al 2 O 3 -SiO 2 network, and inhibited the phase transition of Al 2 O 3 -SiO 2 in high-temperature. This study provides a reproducible approach for the rapid preparation of high-strength, low-thermal conductivity oxide ceramic aerogels and demonstrates its promising application potential in thermal protection.
研究领域:
材料科学
·
陶瓷材料
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热工工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
CATALYSIS TODAY
·
2025
·
IF 5.3
Jianbo Wang,Jianteng Yan,Qingyan Cui,Tiesen Li,Jie Shi,Tinghai Wang,Yuanyuan Yue,Xiaojun Bao
In order to gain insight into the influence of SiO 2 support particle size on the vacuum residue (VR) slurry-phase hydrocracking performance of Fe-based catalysts, a series of FeZn/SiO 2 catalysts with varying SiO 2 particle sizes were prepared. Characterization results show that the surface area and pore volume of the FeZn/SiO 2 catalysts increase with the reduction of SiO 2 particle sizes. The metals Fe and Zn species on FeZn/SiO 2 -S catalyst are more readily reducible via H 2 -TPR analysis. Notably, FeZn/SiO 2 -S catalyst presents higher metal dispersion and a greater degree of sulfurization compared to the other catalysts by XRD and XPS characterizations. Hydrocracking results demonstrate that the FeZn/SiO 2 -S catalyst achieves the lowest coke and gas yields (11.9 wt% and 0.4 wt%), respectively, and the highest VR conversion among these catalysts. The superior performance of the FeZn/SiO 2 -S catalyst in VR slurry-phase hydrocracking is ascribed to its enhanced hydrogenation activity, deriving from the higher dispersion and sulfurization of metals species. This suppressed the aggregation of polycyclic aromatic hydrocarbons in VR and the over-cracking of intermediate products. Additionally, the increased mesopore associated with smaller SiO 2 particles facilitates to the diffusion of large VR molecules, further promoting the hydrocracking reaction.
研究领域:
化学工程
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催化材料
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS CHEMISTRY AND PHYSICS
·
2019
·
IF 2.781
Hong Lei,Tingting Liu,Lei Xu
SiO 2 abrasive is one of the most effective abrasives used in chemical mechanical polishing (CMP) due to its uniform size, good dispersibility and good chemical reactivity. In this paper, a series of novel Sm-doped colloidal SiO 2 composite abrasives were synthesized by seed-induced growth method. The composite abrasives were characterized by using scanning electron microscopy, time-of-flight secondary ion mass spectrometry analysis (TOF-SIMS) and X-ray photoelectron spectroscopy (XPS). The structure of the composite abrasive is core-shell type with silica as a core and a coated growth layer (including SiO 2 , Sm 2 Si 2 O 7 and Sm(OH) 3 as shell via chemical bonds and hydrogen bonds . The CMP properties of the composite abrasives on sapphire substrates were further studied and the results show that the Sm-doped colloidal SiO 2 composite abrasives give lower polished surface roughness (Ra) and higher MRR than that of the pure colloidal SiO 2 abrasive under the same polishing conditions. By TOF-SIMS and XPS analyses on the polished slurries, the acting mechanisms of Sm-doped colloidal SiO 2 composite abrasives on sapphire were explored also.
研究领域:
材料科学
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
Journal of Energy Storage
·
2022
·
IF 8.907
Lei Liu,Xiwang Miao,Xiang Cheng,Huigang Wang,Min Guo,Fangqin Cheng,Mei Zhang
In this work, PCM nanocapsules composed of ZnO/SiO 2 shell and n-octadecane core were successfully synthesized by emulsion polymerization and hydrothermal method . The crystallinity of ZnO was enhanced on the SiO 2 shell by MPTS modification. The granule-like ZnO were distributed on the SiO 2 shell. The encapsulation rate of n-octadecane in nanocapsules was about 45.2 % with enthalpy of 95.0 J/g melting at room temperature 28.3 °C. Furthermore, due to the presence of ZnO, the synthesized PCM nanocapsules had excellent UV absorption properties for whole wavelengths, and the absorbed UV light can be converted into heat energy for storage, and the photothermal conversion efficiency had reached 25.0 %. Hence, the prepared ZnO/SiO 2 @n-octadecane nanocapsules had broad application prospects due to its thermal energy storage , UV protection and photothermal conversion performance.
研究领域:
材料科学
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能源工程
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化学工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2022
·
IF 16.744
Huijuan Liu,Keyan Wei,Chao Long
Y zeolite with high specific surface area and peculiar microporous channels has been regarded as a promising adsorbent in volatile organic compounds (VOCs) control. However, a scalable strategy for improving the hydrophobicity and mass diffusion of Y zeolite to remove VOCs remains a challenge. In this study, we successfully synthesized two NaY@ meso -SiO 2 core–shell composites with different shell thicknesses by coating NaY zeolite with mesoporous SiO 2 (NaY@ meso -SiO 2 -0.8 and NaY@ meso -SiO 2 -1.2), which significantly improved the hydrophobicity of NaY zeolite and diffusion of VOCs into NaY zeolite. The results of XRD, SEM, TEM, FTIR and BET confirmed the successful synthesis of core–shell composites. The adsorption equilibrium experiments showed that coating NaY zeolite with mesoporous SiO 2 effectively enhanced the hydrophobicity of NaY zeolite. Under RH = 0, the adsorption capacity of pristine NaY zeolite was the highest; while under RH = 50%, NaY@ meso -SiO 2 -1.2 exhibited stronger adsorption ability and excellent hydrophobicity. The adsorption diffusion indicated that coating NaY zeolite with mesoporous SiO 2 remarkably promoted the diffusion of VOCs into composites. Compared with the pristine NaY, core–shell composites showed higher diffusion coefficients and lower diffusion activation energy under RH = 0, particularly NaY@ meso -SiO 2 -1.2. In addition, linear solvation energy relationships (LSERs) revealed that π-/n-electron pairs interaction became weak and dipolar interactions were enhanced when water was adsorbed on the surface of NaY@ meso -SiO 2 -1.2. Hydrogen bonding decreased when RH level reached 50% and then increased with the increase of RH from 50% to 90%.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
COMPARATIVE BIOCHEMISTRY AND PHYSIOLOGY C-TOXICOLOGY & PHARMACOLOGY
·
2021
·
IF 3.228
Qin Wang,Qing Chang,Mei Sun,Chenghao Liu,Jiahui Fan,Yijun Xie,Xiaoyong Deng
The complex combined effects of nanoparticles and environmental pollutants in the aqueous environment will inevitably affect aquatic ecosystem and human life. Bisphenol A (BPA) is listed as a typical kind of endocrine disruptors , there is little research about the joint toxicity of co-exposure of SiO 2 nanoparticles (NPs) and BPA. In this study, fluorescent ultra-small SiO 2 NPs (US-FMSNs) around 6.3 nm were synthesized and investigated for their combined effects with BPA on zebrafish during the early developmental stages within 4–168 h post fertilization (hpf). The results showed that US-FMSNs could accumulate in the chorion , abdomen and intestine in zebrafish. In addition, the different concentration (0.1, 1, 10 μg/mL) of BPA and US-FMSNs (200 μg/mL) demonstrated strong impact on multiple toxic endpoints at four periods (72, 96, 120, 168 hpf). We found US-FMSNs had no significant toxic effect on zebrafish, while BPA (10 μg/mL) showed a degree of developmental toxicity . Compared with single BPA (10 μg/mL) exposure, combined exposure enhanced the developmental toxicity of zebrafish, including increased mortality, decreased hatching rate and body length, and decreased activity of total superoxide dismutase (T-SOD) and increased malondialdehyde (MDA) levels. Our results indicated that US-FMSNs and BPA induced oxidative stress , and the effect of the co-exposure was less than that of single exposure (10 μg/mL). This study hereby provides a basis for the potential ecological and health risks of SiO 2 NPs and BPA exposure.
研究领域:
环境科学
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毒理学
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水生生态学
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纳米技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Sustainable Energy & Fuels
·
2023
·Vol. 7
·期 5
·1245-1255
·
IF 5.6
Furong Zhang,Kunpeng Jiang,Guisheng Zhu,Huarui Xu,Xiuyun Zhang,Yunyun Zhao,Yejun Zhang,Qiangbin Wang,Pengfei Pang,Aibing Yu
Solid-state lithium batteries (SSLBs) are promising energy-storage devices. However, the low ionic conductivity of solid electrolytes and poor interface stability are two challenges to their commercial application. To alleviate these problems, we investigated three different composite modes of ZIF-8 and SiO2: (1) mechanical mixing of ZIF-8 and mesoporous SiO2 (ZIF-8+SiO2); (2) mesoporous SiO2 spheres adsorbed on the surface of ZIF-8 (ZIF-8/SiO2); (3) mesoporous SiO2 shell deposited on the surface of ZIF-8 (ZIF-8@SiO2). In particular, ZIF-8@SiO2/IL was obtained when ZIF-8@SiO2 with a hierarchical pore structure was used as the host of the Li+-containing ionic liquid (IL). By combining ZIF-8@SiO2/IL as a filler with polyethylene oxide and lithium bis(trifluoromethanesulfonyl)imide, the composite electrolyte (PZS-3) showed excellent performance. PZS-3 showed a high ionic conductivity (2.35 × 10−4 S cm−1 at 30 °C), wide electrochemical stability window (5.5 V), and high Li+ transference number (0.6), and excellent compatibility with the Li metal and electrodes. An SSLB composed of LiFePO4/PZS-3/Li exhibited outstanding cycling stability with an initial discharge capacity of 155.6 mA h g−1 at 0.2 C and capacity retention of 96.5% after 100 cycles. This novel design strategy offers a promising approach for MOFs composited with other inorganic materials to construct prospective hierarchical Li+ channels.
研究领域:
材料科学
·
能源存储技术
✓ 已验证
产品关联
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Chao Wang,Nankun Chen,Yiyao Xiao,Jiahao He,Rui Han,Ningning Song
Fe 3 O 4 @SiO 2 composites with different morphologies (hollow nanorods , porous nanorods, and flower-like nanoparticles) were constructed using different preparation methods. Considerably enhancement of resonance frequency and permeability beyond Snoek’s limitation were observed in the Fe 3 O 4 @SiO 2 composites with shape anisotropy and porous core-shell nanostructure . The resonance frequency of porous Fe 3 O 4 @SiO 2 nanorods enhanced to 4.21 GHz, which is much higher than the natural resonance frequency of 1.2 GHz for Fe 3 O 4 bulk. The minimum reflection loss (RL min ) of Fe 3 O 4 @SiO 2 porous nanorods reached -59.49 dB at 8.89 GHz, and its effective bandwidth (RL < -10 dB) covered 4.52 GHz at a thickness of 3.18 mm. In addition, the radar scattering cross section (RCS) reduction value reached more than 48 dBm 2 after removing the background. Our study provides insight into the relationship between anisotropy, core-shell structure, morphology of nanoparticles and corresponding microwave performance, and provides a reference scheme for the fabrication of high-performance lightweight microwave absorbing materials.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
ChemCatChem
·
2018
·Vol. 10
·期 24
·5689-5697
·
IF 4.674
Wei Hong,Zhi-Qiang Wang,Shihui Zou,Yuheng Zhou,Linfang Lu,Qiuyue Zhou,Xue-Qing Gong,Jie Fan
Graphical Pt does it again ! The morphology of Pt nanoparticles was successfully regulated by calcinating Pt/SiO 2 catalysts in different atmospheres and achieved a 78.1 % cyclohexanone yield at 170 °C in oxidative dehydrogenation of KA-oil. It is industrially attractive to produce cyclohexanone directly from gas-phase oxidative dehydrogenation (ODH) of KA-oil (a mixture of cyclohexanone and cyclohexanol) since extra alcohol-ketone separation process can be potentially omitted. Herein, by simply tuning the calcination atmosphere of Pt/SiO 2 , we successfully regulated the morphology of Pt nanoparticles and optimized their catalytic performance in ODH of KA-oil. Pt/SiO 2 calcined in O 2 atmosphere showed a cube-like morphology and achieved a 78.1 % cyclohexanone yield at 170 °C, which surpassed its counterpart calcined in H 2 and most of the reported catalysts. Further experimental and theoretical calculation results indicated that cubic Pt nanoparticles possessed stronger adsorption ability to cyclohexanol and therefore performed better in ODH of KA-oil.
研究领域:
催化
·
化学工程
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Polymer Materials
·
2022
·
IF 4.855
Jingfang Zhu,Longyang Li,Longxiang Han,Meng Dong,Zhixiang Zeng,Litao Sun
Since the emergence of the COVID-19 pandemic, there has been a tremendous increase in the production of masks worldwide, with more than 1.5 billion masks having been disposed of during this time. The damage caused by mask pollution is a global threat; highlighting the need to dispose of discarded masks correctly. Herein, we report a recycling approach that uses discarded masks to fabricate a superhydrophobic epoxy resin/SiO2 membrane for separating emulsions. The composite has a high flux value (2123 L·m–2·h–1) and high separation efficiency (>98%). The filter maintained its excellent superhydrophobic property (WCA > 150°) after tape-peel cycles, clamping cycles with tweezers, abrasion cycles with 800 grit SiC sandpaper, pressure with fingertips, and kneading cycles. This study proposes a renewable, eco-friendly, and low-cost product, which can be used for oil spill cleanup and water purification. The filter not only removes oil from oily wastewater (such as oil spills) but also solves pollution caused by discarded masks. This study provides insights for resource recovery that may contribute to the purification of oily water emulsions.
研究领域:
环境科学
·
材料科学
·
可持续发展
✓ 已验证
产品关联
DOI
高影响因子
ADVANCED MATERIALS
·
2023
·
IF 29.4
Yingzhen Wei,Shuang Wang,Mengyang Chen,Jinfeng Han,Guoju Yang,Qifei Wang,Jiancheng Di,Hongli Li,Wenzheng Wu,Jihong Yu
Core–shell catalysts with functional shells can increase the activity and stability of the catalysts in selective catalytic reduction of NO x with ammonia x . However, the conventional approaches based on multistep fabrication for core–shell structures encounter persistent restrictions regarding strict synthesis conditions and limited design flexibility. Herein, a facile coaxial 3D printing strategy is for the first time developed to construct zeolite-based core–shell monolithic catalysts with interconnected honeycomb structures, in which the hydrophilic noncompact silica serves as shell and Cu-SSZ-13 zeolite acts as core. Compared to a Cu-SSZ-13 monolith which suffers from the interfacial diffusion, the SiO 2 shell layer can increase the accessibility of active sites over Cu-SSZ-13@SiO 2 , resulting in a 10–20% higher NO conversion at200−550 °C under 300 000 cm 3 g −1 h −1 . Meanwhile, a thicker SiO 2 shell enhances the hydrothermal stability of the aged catalyst by inhibiting the dealumination and the formation of CuO x . Other representative monolithic catalysts with different topological zeolites as shell and diverse metal oxides as the core can be also realized by this coaxial 3D printing. This strategy allows multiple porous materials to be directly integrated, which allows for flexible design and fabrication of various core–shell monolithic catalysts with customized functionalities.
研究领域:
材料科学
·
环境科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
INDUSTRIAL CROPS AND PRODUCTS
·
2019
·
IF 4.191
Gaofeng Chen,Tingzhou Lei,Zhiwei Wang,Shijie Liu,Xiaofeng He,Qian Guan,Xiaofei Xin,Haiyan Xu
A mesoporous composite CoCuK/ZrO 2 -SiO 2 catalyst with high activity and long life was prepared by vacuum impregnation and multisolvent self-assembly. The catalytic activity of the mesoporous catalyst was investigated for the synthesis of ethanol and higher alcohols from biomass syngas from wheat straw. The catalyst was characterized by small-angle X-ray diffraction, power XRD, N 2 adsorption and desorption experiments (BET), and transmission electron microscopy (TEM). The effects on the reaction activity and products from the addition of alkali metal promoter K, the modification of ZrO 2 and different copper/cobalt compositions were analyzed. The life of the catalyst was determined using a pressurized fixed-bed reactor. The results show that the catalyst possesses the high CO hydrogenation activity, high C 2+ OH selectivity and high life expectancy needed to meet industrial applications.
研究领域:
催化化学
·
可再生能源
·
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）