ENERGY & FUELS
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2025
·
IF 5.3
Dekang Li,Zhixian Bao,Lijun Jin,Haoquan Hu
Dry reforming of methane (DRM) can spontaneously use CO2 and CH4 to produce syngas, but minimal sulfur impurities in the feed gas can poison and deactivate the catalyst. Although the Ni/Al2O3 catalyst has excellent DRM activity, it is challenging to regenerate due to sulfation of the support. Besides that, the loading of sacrificial promoters used to improve sulfur resistance, such as Cu, may impact the DRM performance of active sites. Here, a spatial separation strategy was proposed to precisely design a sulfur-resistant catalyst, dividing the catalyst into a DRM zone and a H2S adsorption zone. The Ni@SiO2@NiCu catalyst prepared by this strategy shows stable DRM performance and significantly improved sulfur resistance and can be regenerated repeatedly. The Ni@SiO2@NiCu catalyst has the best sulfur resistance, 6.8 times that of the spatially adjacent NiCu@SiO2 catalyst and 1.4 times that of the Ni@SiO2@Cu catalyst. This spatial separation strategy introduces a novel concept for the controllable synthesis of sulfur-resistant catalysts and may inspire further applications in the design and development of such catalysts.
研究领域:
催化化学
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化学工程
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材料科学
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环境科学
·
能源技术
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产品关联
DOI
高影响因子
Journal of Coatings Technology and Research
·
2025
·
IF 2.8
Zhou Haitao,Lu Tianhao,Xia Wulin,Kuang Guankun,Qin Ying,Peng Xiaoxiao,Liu Yan,Xin Binjie
Since the main solvent of waterborne polyurethane (WPU) is water, its water resistance is poor. Additionally, the low oxygen index of WPU adhesive films limits their flame-retardant efficacy as coatings, thereby restricting their application scope. To address these limitations, this study independently modified the hydrophobicity and flame retardancy of WPU. First, a cyclophosphonitrile derivative (HCCP-6) was synthesized as a flame retardant. Flame-retardant WPU (NPWPU) was then prepared by reacting the –NH 2 group of HCCP-6 with the –NCO group of a polyurethane prepolymer, incorporating the flame-retardant properties into the WPU polymer chain via free-radical grafting. Next, hydrophobic F-SiO 2 suspensions were prepared and combined with NPWPU emulsions of varying concentrations. The mixtures were sprayed onto cotton fabrics using an airbrush to produce waterproof, flame-retardant polyurethane-coated textiles. Results demonstrated that NPWPU/F-SiO 2 -coated cotton fabrics exhibited water contact angles exceeding 150°, indicating excellent hydrophobicity. These fabrics also showed increased char residue, reduced total heat release, and suppressed smoke production. This performance stems from the synergistic flame-retardant effect of nitrogen (N) and phosphorus (P), coupled with the high-temperature resistance of SiO 2 , which promotes char formation, shields the material’s inner layers from thermal degradation, and enhances overall flame retardancy.
研究领域:
高分子科学
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材料工程
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纺织技术
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阻燃材料
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表面化学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2024
·
IF 3.7
Qiaolin Tang,Feng Zhu,Yanqi Li,Sijie Yin,Yunbo Xu,Huicheng Yan,Ming Kang,Guanjun Chang
In the present study, a novel silane coupling agent, designated INSi, was synthesized via a facile synthetic route, incorporating indole-functional moieties. This agent was further employed for the surface modification of homemade silica nanomicrospheres (SMPs). The ensuing nanomicrosphere composite, denoted as SiO2@IN, exemplified pronounced interfacial π–π interactions. Optimization of the reaction conditions was conducted using the response surface optimization technique. Subsequent validation of interfacial π–π interactions was accomplished through a synergistic approach, integrating theoretical calculations and comprehensive analyses of spectral and morphological attributes exhibited by the SiO2@IN.
✓ 已验证
产品关联
DOI
PubMed
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2016
·
IF 3.719
Zhenchong Zhang,Yizhuo Gu,Jiayu Bi,Shaokai Wang,Min Li,Zuoguang Zhang
Barium titanate@silicon dioxide (BT@SiO 2 ) core@shell fillers with an average diameter of 100 nm were prepared by a facile sol–gel synthesis. The thickness of SiO 2 shell can be easily tuned by varying different mass ratio of BT to tetraethyl orthosilicate (TEOS). Polyvinylidene fluoride (PVDF) based composite films reinforced by BT and BT@SiO 2 were fabricated via a solution casting method. The effects of SiO 2 shell on morphology structure, wettability , interfacial adhesion, dielectric , electrical and energy performances of composites were investigated. Compared with BT/PVDF, BT@SiO 2 /PVDF composites show significantly increased breakdown strength due to enhanced interfacial adhesion and suppressed charge carrier conduction. Benefiting from enhanced breakdown strength and reduced remnant polarization induced by SiO 2 shell, BT@SiO 2 /PVDF shows increased release energy density (energy density which can be fully discharged and applicable). Especially, BT@SiO 2 /PVDF with SiO 2 thickness of 4 nm exhibits the highest release energy density of 1.08 J/cm 3 under applied electric field of 145 kV/mm.
研究领域:
材料科学
·
电气工程
✓ 已验证
DOI
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 2
·025303
·
IF 1.929
Pan Sun,Xiayi Liang,Yue Ding,Tingwei Wang,Shanglin Xiang,Dongyu Cai
The anti-slip (AS) layer of the cement concrete pavement (CCP) can probability decrease traffic accidents and extend the service life of the road. Epoxy resin has excellent adhesion and mechanical strength, making it possible in this field. Herein, a flexible waterborne epoxy resin (WER) without a small molecule emulsifier was synthesized by bisphenol A epoxy resin, poly (propylene glycol) diglycidyl ether (PDE), diethylenetriamine (DETA). The mechanism of the group reaction was characterized by fourier transform infrared (FTIR), and dynamic scanning calorimetry (DSC) determined the heat of curing of WER. Then, the physical properties of WER were enhanced by the silane coupling agent modified nano-silica (SCA-NS) and the composite's water absorption rate and mechanical propriety were evaluated. Finally, the pavement performance of the AS layer was prepared and tested as well as compared with the commercial waterborne epoxy resin (CWER) and emulsified asphalt (EA). The result shows EA has low durability and adhesion strength than epoxy resin. The small molecule emulsifier and low-flexible resistance of CWER decrease water stability and anti-sliding durability of the AS layer. Due to applied nanomaterial reinforced and without small molecule emulsifiers, the WER base AS layer shows extremely high adhesion strength, water stability, and skid-resistance durability at addition 3 wt% of SCA-NS, which have a great potential for CCP.
研究领域:
材料科学
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土木工程
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交通运输工程
✓ 已验证
DOI
高影响因子
Nanomaterials
·
2022
·Vol. 12
·期 20
·3688
·
IF 5.719
Hashim,Muhammad Hafeez,Nidhal Ben Khedher,Sayed Mohamed Tag-EIDin,Mowffaq Oreijah
In recent years, energy consumption has become an essential aspect in the manufacturing industry, and low heat transfer is one of the obstacles that affect the quality of the final product. This situation can be managed by suspending nanoparticles into ordinary heat transferring fluid (the base fluid). This newly prepared colloidal suspension has better heat transport capabilities. Keeping such usage of nanofluids in mind, this research was performed to better understand the heat transport characteristics during flow analysis saturated in porous media subject to Al2O3-SiO2/water hybrid nanofluids. This flow problem was generated by a stretching/shrinking surface. The surface of the sheet was under the influence of mass suction and second-order partial slip. The boundary layer flow was formulated in a system of partial differential equations by utilizing basic conservation laws in conjunction with the Tiwari and Das nanofluid model. Then, the appropriate form of the similarity transformation was adapted to transform the model into a system of ordinary differential equations. The built-in function, i.e., the bvp4c function in the MATLAB software, solved the reduced form of the boundary layer model. The novelty of this study lay in the predicting of two different exact and numerical solutions for both the flow and temperature fields. The computed results showed that the medium porosity as well as the nanoparticle volume fraction widened the existence range of the dual solutions. In addition, the investigational output exposed the fact that the temperature fields were significantly enhanced by the higher nanoparticle volume fraction. Moreover, the outcomes of this study showed a superb correlation with existing works. The present results can be utilized in various branches of science and engineering such as the polymer industry and in the treatment of different diseases.Keywords:hybrid nanofluid;stretching/shrinking sheet;dual solutions;semi-analytical solution;porous medium
研究领域:
工程热物理
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材料科学
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DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2016
·Vol. 4
·期 30
·11949-11956
·
IF 8.262
Lian-Kui Wu,Xin-Yu Liu,Ji-Ming Hu
Ti-supported IrO2 or RuO2 oxide coated electrodes are widely used for the oxygen evolution reaction (OER) in acidic media. Electrocatalytic activity and long-term stability need to be further improved for these types of electrodes. A highly porous and well-adhered electrodeposited SiO2 (e-SiO2) film is proposed as the interlayer in this work to meet the above-mentioned requirements. The results show that the active oxide fully fills in the porous network throughout the whole thickness of the e-SiO2 film, to form “total-depth” highly porous oxide electrocatalytic coatings. For this reason, more than 1 order of magnitude higher apparent activity towards the OER at the Ti/e-SiO2/IrO2 (or RuO2) electrode is achieved compared to that of the conventional Ti/IrO2 or Ti/RuO2 electrode. Literature survey indicates that these novel electrodes are one of the most active Ti electrodes ever reported. The service life of this type of electrode is also obviously enhanced due to the “inter-locking” structure formed between the active oxide layer and e-SiO2 film.
研究领域:
电化学
·
材料科学
✓ 已验证
DOI
高影响因子
CELLULOSE
·
2020
·Vol. 27
·期 7
·4133-4144
·
IF 4.21
Yang Huiyu,Li Ke,Liu Weiqiang,Liu Xin,Xu Weilin,Deng Bo
SiO 2 nanoparticles were synthesized by the Stober method. Their diameters were finely tuned from 250 to 580 nm by varying the NH 3 ·H 2 O and tetraethyl orthosilicate (TEOS) concentrations. SiO 2 particles with different diameters were assembled onto the surface of cotton fabric via the layer-by-layer electrostatic self-assembling method to achieve structural colored fabrics. The surface morphologies of the synthesized SiO 2 particles and structural colored cotton fabrics were analyzed by scanning electron microscopy. The chemical composition of SiO 2 particles was analyzed by Fourier transform infrared spectroscopy and X-ray diffraction. The thermal properties and color properties of structural color fabrics were analyzed by thermogravimetric analysis, UV reflectance spectroscopy and spectrophotometer.
研究领域:
材料科学
·
纺织工程
✓ 已验证
DOI
高影响因子
JOURNAL OF THE TEXTILE INSTITUTE
·
2025
·
IF 1.5
Shiyu Li,Shuqiang Liu,Huimin Li,Man Zhang,Gaihong Wu,Kun Jia,Wenjie Dong,Jingjing Zhao,Huiqin Zhang
Fire protection and thermal insulation clothing is an important protective equipment in the process of fire fighting and rescue, and it is of great significance to enhance its thermal protection effect. This paper adopts the in situ synthesis of SiO2-based fiber aerogel with excellent thermal insulation function and basalt fabric with flexible high temperature resistance and excellent mechanical properties, after which TiO2 nanoparticles are uniformly dispersed in the resin solution, and then the composite material is applied to the surface of basalt fabric using the impregnation process to prepare a composite fabric with excellent thermal stability and thermal insulation properties. The results show that the fineness of the fiber increases with the increase of PVA concentration, and gradually becomes stable at 10% concentration and the heat insulation performance is the best. When the amount of aerogel pre-dispersion is 20 ml, the temperature can be kept below 70 at 100 °C. TiO2 can reduce the infrared radiation transmittance, and when the addition amount is 10%, it has a good protection effect on the fabric. The development of this fabric has important practical significance and application value for fire protection, industrial production, building insulation, and other fields.
研究领域:
材料科学
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纺织工程
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消防防护
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热防护材料
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高分子复合材料
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2025
·
IF 5.4
Haixia Liao,Lei Tang,Fan Yang,Yuaojie Huang,Xiaoli Xiao,Yuanqiang Zhu
Nanofluid flooding technology has shown great application potential in enhancing oil recovery in low-permeability reservoirs. To better leverage the size advantage of nano-SiO 2 and improve its dispersion stability, this paper describes the preparation of three types of nano-SiO 2 modified with negatively charged (NPs-YI), positively charged nano-SiO 2 (NPs-YA), and zwitterionic nano-SiO 2 (NPs-LX) by grafting three different electrically charged groups onto the surface of nano-SiO 2 using silane coupling agents. Fourier transform infrared spectroscopy, transmission electron microscopy, thermogravimetric analysis, and particle size analysis show that the surface modification of nano-SiO 2 is successful. The median particle size of NPs-YI is 35 nm, and that of NPs-YA is 55 nm. The modified nano-SiO 2 exhibits good dispersion performance. The effects of temperature, salt concentration, and pH on the dispersion stability of the modified nanofluids were investigated. Results showed that NPs-YI and NPs-YA exhibited minimal changes in median particle size, zeta potential, and transmittance within a 90℃ range. Even under alkaline conditions and within a salt concentration range of 30000 mg/L, the modified nanofluids maintained strong dispersion stability. Static sedimentation experiments demonstrated that under simulated formation water conditions of 30000 mg/L, NPs-YI and NPs-YA remained stable for over 14 days, NPs-LX for over 7 days, while unmodified nano-SiO 2 completely settled within one day. The addition of the modified nanofluids altered rock wettability; after treatment with NPs-YA, the contact angle on the rock surface decreased from 159.17° to 40.24°, indicating a water-wet rock surface. Furthermore, the oil-water interfacial tension decreased to a minimum of 8.19 mN/m after nanofluid treatment. Core displacement and micro-displacement experiments showed that the oil recovery rate of 1000 mg/L NPs-YI crude oil reached a maximum of 43.8%, with a permeability retention rate of 90.8% and minimal core damage. Modified nanofluids primarily enhance oil recovery by reducing oil-water interfacial tension, altering rock wettability, and generating structural separation pressure. The application potential of the three nano-SiO 2 fluids with different surface charge types proposed in this paper in low permeability reservoirs has been verified.
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THERMAL ANALYSIS AND CALORIMETRY
·
2025
·
IF 3.1
Jin Jiafei,Cai Xiaoming,Zhang Zhiwu,Zhao Ziming,Fu Han,Tang Junwen,Xiao Weiqi,Qin Ming,Cai Jinming
As the power density of electronic devices continues to increase, traditional coolants (e.g., water and ethylene glycol) are unable to meet the demand for efficient heat dissipation. This study prepared graphene oxide (GO)/aminated iron (III) oxide (Fe 3 O 4 @SiO 2 –NH 2 ) nanofluids (NFs, abbreviated as GF NFs) with different mass fractions, and systematically investigated their stability, thermophysical properties, and heat transfer enhancement (HTE) mechanism under magnetic field modulation. Experimental results show the following: The viscosity of NFs increases with rising particle concentration and decreases with increasing temperature; Conductivity increases with increasing concentration and temperature. For heat transfer performance, the convective heat transfer coefficient (h) of the NFs increased significantly with flow rate. Adding 0.05 mass% GF to the base fluid, the maximum HTE of GF NFs reached 120%. reducing the device temperature by 2.2 °C. Under a 1460 G magnetic field, the 0.1mass% GF NF reduced the device temperature by 2.6 °C compared to the base fluid. Combined with numerical simulations, this study reveals that the Brownian motion of nanoparticles (NPs) and magnetically induced micro-convection synergistically disrupt the thermal boundary layer, thereby enhancing the heat transfer performance of NFs. This study provides novel functionalized NF materials and regulation strategies for the intelligent thermal management of high-power electronic devices.
✓ 已验证
产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Tianchi Zhou,Haodong Xu,Lu Cai,Juanjuan Wang
Based on pentaerythritol phosphate urea salt (PEPAS), 2-(4-(4,6-dichloro- 1,3,5-triazin-2-ylamino) phenylsulfonyl) ethyl sulfate sodium (CYPA) and nano-SiO 2 , a novel flame-retardant method for cotton fabrics was developed via chemical modification and nano deposition technologies. The chemical structure of PEPAS and CYPA was studied using Fourier transform infrared (FT-IR) spectroscopy and nuclear magnetic resonance (NMR, 1 H) spectroscopy. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM) combined with elemental dispersive spectroscopy (EDS) and FT-IR were performed on the cotton fabrics, showing that PEPAS, CYPA and nano SiO 2 were successfully introduced into the cotton fabrics, formed a complex internal network structure and generated a continuous carbon layer during the burning process. TG/DTA analysis indicated that the sample treated with 300 g/L PEPAS, 125 g/L CYPA and nano-SiO 2 deposition (TCFSi) showed significantly smaller exothermic quantities than the original cotton sample (OCF) and the char yield data were improved from 3.41% in OCF to 15.02% in TCFSi at 700 °C. The LOI value of the TCFSi sample reached 31.8 and remained at 27.8 after 20 launderings, while that of OCF was only 17.8. In the vertical flammability tests, the TCFSi samples were hard to ignite, had excellent self-extinguishing ability and exhibited no after-flame and afterglow time while the OCF samples burnt to complete ash with an after-flame time and afterglow time of 17.4 s and 42.6 s, respectively. Even after 50 launderings, the afterglow time of the TCFSi sample was only 3.1 s and the basic form of the fabric was sustained after combustion. Overall, the results showed that the anti-flame performance of the cotton fabrics treated with PEPAS, CYPA and nano SiO 2 was significantly enhanced.
研究领域:
材料科学
·
纺织工程
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）