CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Haochuan Wang,Xin Liu,Hui Xie,Chong Wang,Wei Wang,Jinxiang Hong,Pan Feng
The poor dispersion of nano-SiO₂ in shotcrete systems limits its effectiveness and can even lead to detrimental effects. To address this issue, ettringite suspension was introduced as a novel dispersion carrier. Nano-SiO₂ was found to physically adsorb onto ettringite crystals, significantly improving its spatial distribution without organic dispersants. Compared to direct nano-SiO₂ addition, the incorporation of ettringite—especially via premixing—markedly enhanced performance. With premixed nano-SiO₂ and ettringite, and nano-SiO₂ content ranging from 0.25 % to 1 %, the 6-hour compressive strength increased by 93∼600 %, while the initial and final setting times were reduced by 46∼79 % and 47∼91 %, respectively, compared to the control. Isothermal calorimetry, quantitative X-ray diffraction (QXRD), and thermogravimetric analysis (TG) confirmed that the well-dispersed nano-SiO₂ accelerates early cement hydration by providing abundant nucleation sites facilitating rapid formation of hydration products, mainly calcium silicate hydrate (C–S–H). Simultaneously, ettringite acts not only as a dispersant but also strengthens the early-age framework, enhancing load transfer within the shotcrete matrix.
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DOI
高影响因子
APPLIED CATALYSIS A-GENERAL
·
2025
·
IF 4.8
Hongying Sha,Yuxuan Feng,Jingbo Mao,Hui Lv,Jinxia Zhou
The hydrodeoxygenation of lignin-derived syringol to phenol faces challenges in selectively cleaving C Aryl –O bonds while maintaining aromatic ring and a phenolic -OH group integrity. Herein, we developed a trimetallic CoFeAg/SiO 2 catalyst that achieves 100 % syringol conversion and 52.4 % phenol selectivity, surpassing bimetallic CoAg/SiO 2 (42.2 mol%) and monometallic Co/SiO 2 (7.6 mol%) catalysts. As promoters, Ag facilitates the low-temperature reduction of Co 3 O 4 to CoO and further to metallic Co, while Fe prevents excessive reduction of CoO to metallic Co. Through the synergistic effects of Fe and Ag on Co, the CoFeAg/SiO 2 catalyst undergoes in situ reduction under reaction conditions (1 MPa H 2 , 330 °C), forming a polycrystalline CoO-Co structure with abundant oxygen vacancy (O ᴠ ) and Lewis acid sites. The CoO-Co-O v active sites facilitate heterolytic H 2 cleavage while preferentially adsorbing and activating oxygen-containing functional groups over the aromatic ring of syringol. This dual functionality selectively promotes C Aryl –O bond dissociation while suppressing undesired ring hydrogenation, providing an effective catalyst design strategy for sustainable phenol production from biomass-derived syringol.
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产品关联
DOI
高影响因子
ENERGY CONVERSION AND MANAGEMENT
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2021
·
IF 9.709
Wei Ji,Xiaomin Cheng,Haixue Chen,Linfeng Li,Yuanyuan Li,Zhi Liu
The sol–gel method was used to overcome the disadvantages associated with the high water solubility of molten salt into advantages, and a W/O emulsion system was constructed. The interfacial polymerization reaction was initiated by ammonium hydroxide to generate a SiO 2 shell layer, which served as a microcontainer for Solar Salt to prepare more stable regular spherical microcapsules with a diameter of 886 nm. Meanwhile, the oxygen-containing functional groups on the surface of graphene oxide (GO) were combined with the shell of the SiO 2 @Solar Salt phase-change heat-storage microcapsule through shared electron pairs and hydrogen bonds, such that they were uniformly distributed on the GO layer. The synthesized composite material exhibited a typical morphology of microcapsules with a core–shell structure uniformly loaded on the sheet. This study proves that the encapsulation of SiO 2 and introduction of the high thermal conductivity enhancement phase increased the thermal conductivity of the microcapsules by approximately 45% compared with pure nitrate and maintained a high specific heat capacity of 1.44 J/(g·K). In addition, the microcapsules exhibited excellent photothermal conversion efficiency, effectively absorbing visible light and increasing the heat storage rate. The addition of GO nanosheets and SiO 2 increased the structural stability of the composite material and its cycle life. Owing to the exquisite composite structure, the structural composition of the microcapsule remained unchanged after 500 thermal cycles, maintaining 98.5% latent heat, 99% heat capacity, and good thermal conductivity . This study provides a new solution for the efficient microencapsulation of molten salt heat storage materials.
研究领域:
材料科学
·
能源工程
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DOI
高影响因子
CHINESE JOURNAL OF CATALYSIS
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2018
·
IF 3.525
Yu Zhang,Chenliang Ye,Cuili Guo,Changna Gan,Xinmeng Tong
A series of indium oxide-modified Cu/SiO 2 catalysts were synthesized and used to produce ethanol via methyl acetate hydrogenation. In-Cu/SiO 2 catalyst containing 1.0 wt% In 2 O 3 exhibited the best catalytic activity and stability. The physicochemical properties of the synthesized catalysts were investigated using several characterization methods and the results showed that introducing suitable indium to Cu/SiO 2 increased the copper dispersion, diminished the copper crystallite size, and enriched the surface Cu + concentration. Furthermore, the Cu/SiO 2 catalyst gradually deactivated during the stability test, which was mainly attributed to copper sintering and the valence change in surface copper species. In contrast, indium addition can inhibit the thermal transmigration and accumulation of copper nanoparticles to stabilize the catalyst.
研究领域:
催化化学
·
材料科学
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DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2020
·Vol. 60
·期 5
·1044-1053
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IF 1.917
Yang Yang,Jiming Gao,Ting Lei,Jun Yang,Jin Wang,Jie Liu
Polyimide (PI) composites with mixed fillers of BN flakes and SiC whiskers exhibit enhanced thermal conductivity and mechanical properties. In order to improve dispersion and interaction of these mixed fillers within the PI matrix, BN flakes were modified by a titanate coupling agent while SiC whiskers were oxidized at 750°C for 60 minutes to produce SiC @SiO 2 followed by silane coupling agent modification. PI composites reached a maximum thermal conductivity of 0.95 W/m K at volume fraction of mixed fillers of 27.6 vol% when the weight ratio of BN flakes to SiC @SiO 2 whiskers was 1:4. The enhanced thermal conductivity is likely attributed to the formation of heat conductive networks constructed by BN flakes and SiC @SiO 2 whiskers and the improved interfacial affinity between fillers and matrix. The optimized Nielsen-mold confirms the distribution and morphology of fillers affect the thermal conductivity of PI composites. In addition, SiC whiskers enhanced the mechanical property of PI composites and the influence of fillers on the mechanical property was further elaborated.
研究领域:
材料科学
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复合材料工程
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DOI
高影响因子
Materials Research Express
·
2020
·Vol. 7
·期 11
·116403
·
IF 1.929
Hua Liu,Xiang Li,Lina Lv,Zuozhen Liu,Jianding Chen
The superhydrophobic coating has many excellent properties, but due to the limitation of poor surface mechanical stability and sophisticated preparation engineering, it is challenging to realize large-area application. In this study, a robust superhydrophobic coating with excellent performance was prepared by a simple and fast method. The modified silica nanoparticles was sprayed on the hydrophobic polyurethane coating, and the superhydrophobic surface with a water contact angle of 160° and sliding angle of 2° was successfully prepared after curing under UV lamp for 3 min. The coating can be applied to the surface of all kinds of substrates, and it still has a static water contact angle of 150° after 400 cycles of friction on 500 mesh sandpaper. Furthermore, the coating with verified self-cleaning and anti-icing properties exhibits superhydrophobicity to strong acid and alkali solutions. This simple, fast and environmentally friendly preparation method is expected to realize the wide application of superhydrophobic coatings.
研究领域:
材料科学
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表面工程
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DOI
高影响因子
TEXTILE RESEARCH JOURNAL
·
2014
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IF 1.332
Yan Wang,Yaofeng Zhu,Xiang Fu,Yaqin Fu
A novel sound insulation composite was successfully fabricated by modifying glass fiber fabric with tetrapod ZnO whisker (TW-ZnO)/SiO2-compounded shear thickening fluid (STF). The rheological properties of the compounded STF were evaluated using a high-speed rotational rheometer. The microstructure and sound-insulating properties of the STF-treated glass fiber fabric (STF-fabric) were characterized using a scanning electron microscope and a two-channel acoustic analyzer, respectively. The shear thickening effect of TW-ZnO/SiO2-compounded STF can be better than that of SiO2-monodispersed STF. The sound insulation performance of the STF-fabric, which was superior to that of the original fabric, was related to the fabric weaving structure and shear thickening effect of the compounded STF.
研究领域:
材料科学
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声学工程
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DOI
高影响因子
Journal of Biomedical Nanotechnology
·
2017
·Vol. 13
·期 10
·1344-1353
·
IF 4.521
Luo Dan,Han Rongcheng,Chen Ying,Zheng Qiang,Wang Lijun,Hong Yuankai,Sha Yinlin
The use of silica coatings has been a popular approach for the fabrication of water-soluble and biocompatible surfaces of quantum dots (QDs). However, most methods presently used cause a significant decrease in QD photoluminescence (PL), hampering further applications in biological
and clinical research. We report a convenient method for the preparation of silica-shelled CdSeS/ZnS QDs (QD/SiO2) with a single semiconductor core and a high PL quantum yield (QY) in water (∼0.94, more than twice that of uncoated QDs in chloroform (∼0.44)). In our approach,
a hydrophobic interlayer surrounding the CdSeS/ZnS nanocrystal core was fabricated prior to silanization. This allowed for optimization of intermolecular assembly between surfactants, and the geometric optimization of silane precursors and their initial coordinating ligands, by modulating
their alkyl chain lengths. The resulting, geometrically well-matched interlayer exhibited higher hydrophobicity and lower molecular motility, both of which have been shown to enhance QY. QD/SiO2 surfaces, functionalized with triphenylphosphine, yielded targeted, high-quality fluorescent
images of mitochondria in live cells.
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DOI
高影响因子
Journal of the Taiwan Institute of Chemical Engineers
·
2025
·
IF 6.3
Chen-Xiang Wang,Hao Yang,Li-Wei Liu,Ji-Peng Han,Xue-Fen Zhang
Background Superhydrophobic coatings have shown great promise in providing temporary corrosion protection for aluminum alloys. However, their long-term effectiveness is often compromised by poor mechanical durability and the lack of active protection. Methods In this study, we developed a novel protection coating by integrating a functional epoxy primer containing 8-hydroxyquinoline-loaded mesoporous SiO 2 nanocontainers (8-HQ@MSNs) and a superhydrophobic SiO 2 topcoat. Significant findings After chemical and structural characterization of 8-HQ@MSNs, its optimized content is determined to be 0.5 %. The resulting coating provides long-term protection for aluminum alloys in 3.5 wt. % NaCl solution over 30 days. Notably, the low-frequency impedance modulus of the scratched coating, even after immersion in NaCl solution for 12 h, is one order of magnitude higher than that of the coating lacking 8-HQ with a shorter corrosion duration (6 h). Furthermore, this coating exhibits a strong interfacial bond with aluminum alloys (Grade 0) and can withstand an abrasion distance of 1360 cm on 600 grit sandpaper under a 100 g load, as well as 140 min of continuous high-pressure water impact (25 kPa) without losing its superhydrophobic properties. This study is expected to contribute new insights into developing durable superhydrophobic coatings with active protection for aluminum alloys.
研究领域:
材料科学
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腐蚀与防护
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表面工程
·
纳米复合材料
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高分子涂层
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF ENERGY RESEARCH
·
2021
·Vol. 45
·期 11
·16551-16564
·
IF 5.164
Jiuqing Liu,Meng Liu,Cheng Wang,Qihou Li,Jie Li,Ya Chen,Zikun Hong,Feifei Song,Lishun Bai,Fanli Zeng
Summary The dissolution and diffusion of intermediate product polysulfide in lithium-sulfur battery (Li-S) between electrodes pose great challenge for the further application of Li-S batteries. Herein, we first prepared nano SiO 2 blending polyetherimide (PEI) separator modified with acetylene black/polyvinylpyrrolidone (PVP) coating layer. Joint effect of acetylene black and PVP on polysulfide contribute to outstanding cycle performance. The Li-S cell with CP55 separator presents superior cycle performance (650 mAh g −1 ) than the Li-S cells with the Celgard 2320 and PEI-4 separator after 200 cycles. In addition, the SiO 2 blending PEI separator modified with acetylene black/PVP coating layer for Li-S cells shows higher ionic conductivity (2.02 mS cm −1 ), excellent compatibility with lithium and better thermal stability. This work presents a convenient and economical strategy to alleviate polysulfide dissolution and the CP55 separator is a promising candidate for the further application of Li-S batteries.
研究领域:
材料科学
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电化学
·
能源存储
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DOI
高影响因子
JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2021
·
IF 8.128
Wei Xiong,Ling Li,Fen Qiao,Junwu Chen,Zhi Chen,Xuedong Zhou,Kaiwen Hu,Xiujian Zhao,Yi Xie
Due to the inherent differences in surface tension between water and oil, it is a challenge to fabricate air superhydrophilic-superoleophobic materials despite their promising potential in the field of oil/water separation. Herein, a facile approach is developed to fabricate air superhydrophilic-superoleophobic SiO 2 coating by combination of controllable modifying SiO 2 nanoparticle surface by both hydrophilic groups (i.e., –OH groups) and oleophobic groups (i.e., fluorinated groups) with constructing porous and hierarchical structures. Hydroxyl-modified SiO 2 nanoparticles (NPs) are synthesized using a base-catalysed procedure in the presence of ammonia or NaOH. Chitosan quaternary ammonium salt (HACC) is introduced to bind SiO 2 by forming a unique hydrogen bond between HACC and –OH, followed by adding pentadecafluorooctanoic acid (PFOA) to complex with HACC to form fluorinated groups. The SiO 2 coatings are fabricated on various substrates (e.g., glass, foam and Cu mesh) by spraying procedure and characterized using SEM, FTIR, XPS, etc. The contact angles of oils (e.g., pump oil, castor oil , corn oil, hexadecane and bean oil) and water on the coatings are over 150° and close to 0°, respectively. By optimization, the representative SiO 2 -coated Cu mesh displayed high - efficiency of 99.2% in separating water from mixture of water/pump oil, and high penetration flux of 1.41 × 10 4 L·m −2 ·h −1 . Besides, the coating maintains its superhydrophilic-superoleophobic properties even after 110 cycles of sandpaper abrasion or after being immersed in water for 3 h. After 20 cycles of oil/water separation, the coating retains separation efficiency up to 97.93%. This study provides a new and universal protocol to fabricate unique superwetting surfaces with effective oil/water separation performance, long-term durability and outstanding reusability.
研究领域:
材料科学
·
表面化学
·
环境工程
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DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2018
·
IF 3.909
Xiubin Hou,Zhixin Xue,Yanzhi Xia,Yimin Qin,Guofang Zhang,Hongwu Liu,Kechang Li
Agar/sodium alginate (AG/SA) nanocomposite films were prepared using solution casting method in presence of various concentrations of nano-SiO 2 (2.5, 5, 7.5, and 10 wt%). The effect of nano-SiO 2 concentration on the nanocomposite film was investigated. The result of Fourier transform infrared (FTIR) illustrated the formation of hydrogen bonding between nano-SiO 2 and polysaccharide . As nano-SiO 2 concentration rose from 0 to 10 wt%, the tensile strength and elongation at break all increased up to maximum, respectively. The tensile strength and elongation at break of film containing 10 wt% nano-SiO 2 increased by 65.29% and 60.38% respectively when compared to those of film prepared without nano-SiO 2 . The reason for enhancing in tensile strength might be related to the formation of molecular interaction . The film containing 2.5 wt% nano-SiO 2 had maximum water contact angle and minimum water vapor permeability among those of all films prepared in this work. However, the film containing 10 wt% nano-SiO 2 had minimum swelling degree and water solubility, further demonstrating the formation of strong interaction. The addition of nano-SiO 2 improved the properties of film against UV light and thermal stability . Overall, the addition of nano-SiO 2 enhanced the mechanical properties, water resistance and thermal stability of polysaccharide film.
研究领域:
材料科学
·
食品科学
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DOI
高影响因子
危险品化学品经营许可证（带存储）