COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2023
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IF 5.2
Shuaiyan Ji,Wei Li,Ningning Lv,Xiaoting Chen
The superhydrophilic/underwater superhydrophobic membrane offers unique advantages in effectively separating oily wastewater. However, the development of membrane materials that can efficiently separate emulsions only under gravity is still a challenge. A crosslinked network copolymer P(MA-AMPS) was synthesized by radical polymerization of N, n-methylenebisacrylamide (MBA), methacrylamide (MA) and 2-acrylamide-2-methylpropanesulfonic acid (AMPS) initiated by potassium persulfate. Then polyvinyl alcohol (PVA) and nano-SiO 2 were inserted to the crosslinked polymer system in order to prepare a P(MA-AMPS)/PVA@SiO 2 hybrid hydrogel. The hybrid hydrogel can be sprayed on the surface of stainless steel mesh (SSM) by a simple spraying method, so as to achieve superhydrophilicity/underwater superoleophobicity. The oil-water emulsion permeation flux reached more than 352.94 L·m −2 ·h −1 , while xhibiting a more than 99.5 % separation efficiency under gravity. The anti-fouling tests demonstrated that the membrane exhibited outstanding anti-fouling performance. Moreover, the combination of stable semi-interpenetrating networks and nanoparticles made the membrane exhibit excellent stability and durable separation ability in complex physicochemical environments.
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高影响因子
Small
·
2023
·Vol. 19
·期 44
·2303044
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IF 13.3
Yuqi Xie,Zhaohui Li,Yawen Zhang,Yunjie Lu,Jianming Zhang,Lu Zong
Lightweight porous hydrogels provide a worldwide scope for functional soft mateirals. However, most porous hydrogels have weak mechanical strength, high density (>1 g cm −3 ), and high heat absorption due to weak interfacial interactions and high solvent fill rates, which severely limit their application in wearable soft-electronic devices. Herein, an effective hybrid hydrogel-aerogel strategy to assemble ultralight, heat-insulated, and tough polyvinyl alcohol (PVA)/SiO 2 @cellulose nanoclaws (CNCWs) hydrogels (PSCG) via strong interfacial interactions with hydrogen bonding and hydrophobic interaction is demonstrated. The resultant PSCG has an interesting hierarchical porous structure from bubble template (≈100 µm), PVA hydrogels networks introduced by ice crystals (≈10 µm), and hybrid SiO 2 aerogels (<50 nm), respectively. PSCG shows unprecedented low density (0.27 g cm −3 ), high tensile strength (1.6 MPa) & compressive strength (1.5 MPa), excellent heat-insulated ability, and strain-sensitive conductivity. This lightweight porous and tough hydrogel with an ingenious design provides a new way for wearable soft-electronic devices.
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PubMed
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
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2023
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IF 5.7
Sheng-Jin He,Ling-Feng Su,Chuang-Tian Zhan,Xiu-Bin Chen,Wei-Ming Guo,Shi-Kuan Sun,Li-Xiang Wu,Jia-Xiang Xue,Hua-Tay Lin
Low-temperature joining of SiC ceramics using raw CaO-Al 2 O 3 -MgO-SiO 2 mixed powders (CAMS-P) and CaO-Al 2 O 3 -MgO-SiO 2 glass (CAMS-G) as additives for the liquid-phase sintering of SiC nanopowders (NITE phase) in combination with surface oxidation was studied. Using CAMS-P as an additive for SiC joining required 1650 °C and produced a lower shear strength of 77.2 ± 3.5 MPa, compared to untreated SiC (108.2 ± 15.8 MPa). Using CAMS-G as an additive, the compactness of SiC joints obtained at 1550 °C was higher than that of NITE joints obtained at 1650 °C with CAMS-P as an additive. Nonetheless, the low joining temperature resulted in gaps and delaminations at the interface, and the joints strength was only 48.3 ± 5.6 MPa. Incorporating CAMS-G as an additive and surface oxidation achieved reliable NITE phase joining at 1550 °C, with no observed gaps or delaminations at the interface. The resulting joints strength was as high as 100.0 ± 0.8 MPa. The joining mechanism was discussed and compared, involving microstructural analysis .
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高影响因子
Membranes
·
2023
·Vol. 13
·期 5
·514
·
IF 4.2
Yinghao Lin,Atian Xie,Jian Xu,Changguo Xue,Jiuyun Cui,Jianming Pan
Oil pollution caused by a large number of industrial activities and oil spill accidents has posed serious harm to the environment and human health. However, some challenges remain with the existing separation materials, such as poor stability and fouling resistance. Herein, a TiO2/SiO2fiber membrane (TSFM) was prepared by a one-step hydrothermal method for oil-water separation in acid, alkali, and salt environments. The TiO2nanoparticles were successfully grown on the fiber surface, endowing the membrane with superhydrophilicity/underwater superoleophobicity. The as-prepared TSFM exhibits high separation efficiency (above 98%) and separation fluxes (3016.38–3263.45 L·m−2·h−1) for various oil-water mixtures. Importantly, the membrane shows good corrosion resistance in acid, alkaline, and salt solutions and still maintains underwater superoleophobicity and high separation performance. The TSFM displays good performance after repeated separation, demonstrating its excellent antifouling ability. Importantly, the pollutants on the membrane surface can be effectively degraded under light radiation to restore its underwater superoleophobicity, showing the unique self-cleaning ability of the membrane. In view of its good self-cleaning ability and environmental stability, the membrane can be used for wastewater treatment and oil spill recovery and has a broad application prospect in water treatment in complex environments.
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高影响因子
JOURNAL OF HAZARDOUS MATERIALS
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2023
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IF 13.6
Yajie Liu,Huaqiang He,Tie-Jun Zhang,Tian C. Zhang,Yuan Wang,Shaojun Yuan
It is highly attractive to develop highly efficient oil-in-water (O/W) emulsion separation technologies for promoting the oily wastewater treatment . Herein, a novel inversely Stenocara beetle -like hierarchical structure of superhydrophobic SiO 2 nanoparticle-decorated CuC 2 O 4 nanosheet arrays were prepared on copper mesh membrane by bridging polydopamine (PDA) to make a SiO 2 /PDA@CuC 2 O 4 membrane for substantially enhanced separation of O/W emulsions. The superhydrophobic SiO 2 particles on the as-prepared SiO 2 /PDA@CuC 2 O 4 membranes were served as localized active sites to induce coalescence of small-size oil droplets in oil-in-water (O/W) emulsions. Such innovated membrane delivered outstanding demulsification ability of O/W emulsion with a high separation flux of 2.5 kL⋅m −2⋅ h −1 and its filtrate’s chemical oxygen demand (COD) being 30 and 100 mg⋅L −1 for surfactant-free emulsion (SFE) and surfactant-stabilized emulsion (SSE), respectively, and also exhibited a good anti-fouling performance in cycling tests. The innovative design strategy developed in this work broadens the application of superwetting materials for oil-water separation and presents a promising prospect in practical oily wastewater treatment applications.
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高影响因子
MATERIALS & DESIGN
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2023
·
IF 8.4
Xue-Fen Zhang,Xu-Dong Li,Ning Wang,Yong-Jiang Liu,Feng Tian,Chen-Xiang Wang
In this work, a robust epoxy adhesive (EP) @ superhydrophobic SiO 2 (SH-SiO 2 )-based superhydrophobic coating was prepared on the aluminum substrate by a simple one-step spraying strategy. The prepared EP@SH-SiO 2 coating exhibits hierarchical micro/nanostructures and is capable of maintaining a contact angle of more than 150° after 1000 cm of abrasion length and 80 tape-peeling repetitions. Molecular dynamics (MD) simulations and quantum mechanics calculations show that the improved mechanical resistance is attributed to the enhanced interfacial interaction between the EP@SH-SiO 2 coating and the underlying substrate induced by the epoxy adhesive. Electrochemical measurements in 3.5 wt% NaCl solution show the corrosion inhibition efficiency of the EP@SH-SiO 2 coating reaches up to 99.99%, and even after 8 days of immersion, the low frequency impedance modulus of the EP@SH-SiO 2 sample is still ∼1 order of magnitude higher than that bare aluminum, demonstrating excellent long-term corrosion protection. The diffusion behavior of the corrosive medium in the EP@SH-SiO 2 coating was revealed by MD simulation to support the experimental results. Additionally, the EP@SH-SiO 2 coating exhibits good chemical stability and hydrophobic repair properties. This work will provide a new perspective for the preparation and study of robust superhydrophobic aluminum for corrosion protection properties.
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高影响因子
COMPOSITES PART B-ENGINEERING
·
2019
·
IF 6.864
Tadele Daniel Mekuria,Chunhong Zhang,Diaa Eldin Fouad
SiC@SiO 2 core-shell nanostructured particles were successfully prepared via simple thermal treatment. The structure of the surfaces of pristine SiC and SiC@SiO 2 core-shell nanostructured particles was investigated by X-ray diffraction spectroscopy (XRD). The formation of SiO 2 shell on the SiC core was further evaluated by FTIR , SEM , XPS and TEM techniques. The nanostructured particles prepared were amino-modified by APTMS and incorporated in polyimide (PI) matrix to prepare highly flexible composite films . The mechanical, thermal, UV-shielding and water proof properties of the composites were investigated. The TGA results displayed that T 5 (5% weight loss temperature) and T 10 (10% weight loss temperature) were meaningfully enhanced up to 56.0 °C and 53.4 °C, respectively upon adding various amounts of modified SiC@SiO 2 nanoparticles into the PI matrix. DSC results revealed that the glass transition temperature ( T g ) was considerably enhanced up to 45.50 °C, up on the incorporation of different dosages of SiC@SiO 2 –NH 2 nanoparticles in the matrix. The tensile results shown that introduction of the nanoparticles into the PI medium exhibited highly significant improvement in the tensile strength and the Young's modulus over 77.1% and 96.6% respectively as compared to the neat PI. The incorporation of SiC@SiO 2 –NH 2 nanostructured particles in the matrix highly improved the hydrophobicity of the composites up to 62.55% as compared to the neat PI. The UV-shielding properties were also enhanced when functionalized SiC@SiO 2 –NH 2 was added to the PI matrix. The dispersion of SiC@SiO 2 in the PI matrix was investigated by Scanning electron microscope (SEM).
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
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2018
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IF 3.779
Ziqiang Ai,Changqing Liu,Qiwu Zhang,Jun Qu,Zhao Li,Xiaoman He
In this study, a mechanochemical route to promote the adsorption of the precursor of Zn-Al layered double hydroxide (LDH) was introduced, in which ZnO and SiO 2 were added to Zn basic carbonate and Al hydroxide that were first dry milled into an activated state as a precursor for a LDH phase. The samples prepared in this way were characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FT-IR) and Scanning electron microscopy (SEM). The precursors showed a high adsorption rate when added with the oxides. 10% addition of ZnO gave a maximum MO removal efficiency of 96.91% (193.82 mg/g at initial MO concentration of 160 mg/L), 16.46% higher than the sample without addition. Addition of SiO 2 at 25% allowed MO removal efficiency reaching 88.90% (222.25 mg/g, at initial MO concentration of 200 mg/L), 19.26% higher than the no additive sample. The improvement in the adsorption performance could be attributed to the effective dispersion of the precursor's agglomeration phenomenon. Discussion was performed based on the characterized features of the samples and fitting results on several adsorption models.
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高影响因子
ACS Omega
·
2018
·
IF 0
Tingting Cheng,Jian Chen,Aofei Cai,Jian Wang,Haiyan Liu,Yuandong Hu,Xiaojun Bao,Pei Yuan
A series of silica supported Pd (Pd/SiO2) catalysts were prepared in various HCl concentrations (CHCl) of the impregnation solution with different electrostatic interactions between Pd precursor and support, and their catalytic properties were evaluated by the selective hydrogenation of nitrile butadiene rubber (NBR). The results show that with the CHCl increasing from 0.1 to 5 M, the particle size of Pd nanoparticles dramatically decreases from 24.2 to 5.1 nm and stabilizes at ∼5 nm when CHCl is higher than 2 M. Using the catalysts prepared with a high CHCl (>2 M), an excellent hydrogenation degree (HD) of ∼94% with 100% selectivity to C═C can be acquired under mild conditions. Interestingly, the HD could be remarkably increased from 65 to 92% by increasing only CCl– from 0.1 to 2 M with the addition of NaCl while keeping CH+ at 0.1 M. This is because PdCl42– is the predominant existing form of precursor at high CCl–, which has a strong electrostatic attraction with the positively charged support favorable for the formation of small-sized Pd nanoparticles over silica. Notably, Pd leaching behavior during the hydrogenation reaction is closely related to CH+, and the higher the CH+, the less Pd residues are detected in the hydrogenated NBR. Our contribution is to provide a facile strategy to synthesize effective and stable Pd/SiO2 catalysts via adjusting the electrostatic interaction, which exhibits a high activity and selectivity for NBR hydrogenation.
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PubMed
SEPARATION AND PURIFICATION TECHNOLOGY
·
2018
·
IF 3.927
Jiuyun Cui,Zhiping Zhou,Atian Xie,Minjia Meng,Yanhua Cui,Siwei Liu,Jian Lu,Shi Zhou,Yongsheng Yan,Hongjun Dong
A new PVDF@pDA@SiO 2 nanocomposite membrane was fabricated by virtue of the surface modification of polydopamine anchored SiO 2 on PVDF membrane through a facile and eco-friendly preparation process. It possessed the superior superhydrophilicity/underwater superoleophobicity properties and presented the outstanding antifouling oil performance and high-efficiency separation ability for oil-water emulsions, which mainly resulted from its special surface micro-nano structure and pore induced capillarity phenomenon. Furthermore, the PVDF@pDA@SiO 2 nanocomposite membrane also exhibited the splendid separation performance, regeneration ability and universality for various oil-water emulsions separation. In addition, the oil-water emulsion separation mechanism was discussed in depth. This work might provide a significant guidance for large-scale production and application of this nanocomposite membrane in the fields of wastewater recovery and drinking water treatment.
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高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2018
·
IF 3.485
Junpeng Mei,Hongbo Tan,Hainan Li,Baoguo Ma,Xiaohai Liu,Wenbin Jiang,Ting Zhang,Xin Li
Generally, high volume fly ash would considerably reduce the early strength of cement-based materials, and because of this disadvantage, the added amount of fly ash in steam-cured precast concrete is very limited. In this study, an attempt to enhance the early strength of steam-cured cement-high volume fly ash (40 wt%, CHVFA) system has been done with addition of nano-SiO 2 (NS) and sodium sulfate (SS). Effect of these two chemicals on hydration, pore structure, and microstructure of interfacial transition zone (ITZ) were investigated. The results show that both NS and SS can improve the compressive strength, and the reason is mainly because these two chemicals can accelerate the hydration of cement minerals and can also hasten the pozzolanic reaction of fly ash. By contrast, because of the high activity of pozzolanic reaction and the filling and nucleation effects, NS has much stronger effect on refining pore structure and promoting the hydration of cement; while SS can exert much stronger effect on accelerating the hydration of fly ash than that of NS. An interesting thing can also be seen that with co-doped NS-SS, the enhancement in compressive strength is much stronger than that of the sum of these single systems with the same dosage, indicating that NS and SS can exert the synergistic effect; this effect is involved in the accelerated hydration of CHVFA, the refined pore structure, and the improved microstructure of ITZ. Such results would be expected to provide guidance on enhancing the early strength of steam-cured precast concrete with high volume fly ash in practical engineering.
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高影响因子
Journal of Coatings Technology and Research
·
2024
·
IF 2.3
Guo YanXin,Wang Jinwei,Su Xinyong,Tang Can,Wang Jiaao
SiO 2 -EDTA composite particles are prepared by using nano-silicon dioxide (SiO 2 ) as the loading particle and ethylenediaminetetraacetic acid (EDTA) as the scaling inhibitor. Then, SiO 2 -EDTA particle and polytetrafluoroethylene (PTFE) micro powder are added in water-based silanized maleic anhydride-g-poly(1,2-butadiene) (SiMLPB) to fabricate composite coatings with good anti-scaling and anti-corrosion properties. The water contact angles (WCA) of SiMLPB increase to a maximum of 103° with the addition of PTFE at 3 wt% and then decrease slowly; based on this formulae, the WCA improves to 109 o when SiO 2 -EDTA is added up to 2 wt%. SiMLPB/PTFE coatings exhibit good corrosion resistance with the addition of PTFE; the SiMLPB/3%PTFE/2%SiO 2 -EDTA composite coating possesses impedance (| Z | 0.01Hz ) value at 2 orders higher than that of the SiMLPB/PTFE0 coating at low frequency, suggesting the much greater improvement in corrosion resistance due to the synergistic effects of adding nanoparticle as a surface modifier and EDTA as a corrosion inhibitor. The deposition of CaCO 3 on this SiMLPB/PTFE/SiO 2 -EDTA composite coating reaches 0.0132 g/cm 2 after 120 h scaling test, which is about 79% lower than that on the pure SiMLPB coating, resulting from the chelation of EDTA that promotes the formation of more unstable scales. The improvements in both anti-corrosion and anti-scaling performances are attributed to the hydrophobic function of PTFE and nanoparticle as well as the dual functions of EDTA at an appropriate addition of SiO 2- EDTA.
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高影响因子
危险品化学品经营许可证（带存储）