COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
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2024
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IF 8.1
Zhukang Bai,Yadong Wu,Jun Li,Shun Wang,Xuqiang Peng,Huile Jin
To attain the high dispersion and strong interfacial bonding of TiO 2 in fluororubber (FKM), a novel “core–shell” structured SiO 2 @TiO 2 nanofillers was designed and synthesized by in-situ polymerization and grafting modification method. For the “core–shell” structured SiO 2 @TiO 2 nanospheres , the rough and irregular silica shell can improve the surface area of the SiO 2 @TiO 2 filler and realize the mechanical riveting with the FKM, which shows a significant mechanical properties enhancement function. Compared with the pristine FKM, the tear strength , tensile strength , hardness, modulus at 100% strain, modulus at 300% strain, and storage modulus at −100 °C of FKM/SiO 2 @TiO 2 enhanced by 42.4%, 196.9%, 10%, 24.4%, 66.7%, and 15.5%, respectively. The sample’s electrical, thermal, and color properties were also improved and showed the highest haze and lowest light transmissions. Such a simple and effective method of preparing “core–shell” structured SiO 2 @TiO 2 nanofillers provides great potential in industrial applications.
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Materials
·
2024
·Vol. 17
·期 8
·1849
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IF 3.1
Zhongmin Wang,Xiaoyu Zhou,Yongwei Shang,Bingkui Wang,Kecheng Lu,Weijiang Gan,Huajun Lai,Jiang Wang,Caimin Huang,Zongning Chen,Chenggang Hao,Enlang Feng,Jiacheng Li
The exceptional corrosion resistance and combined physical and chemical self-cleaning capabilities of superhydrophobic photocatalytic coatings have sparked significant interest among researchers. In this paper, we propose an economical and eco-friendly superhydrophobic epoxy resin coating that incorporates SiO2@CuO/HDTMS nanoparticles modified with Hexadecyltrimethoxysilane (HDTMS). The application of superhydrophobic coatings effectively reduces the contact area between the metal surface and corrosive media, leading to a decreased corrosion rate. Additionally, the incorporation of nanomaterials, exemplified by SiO2@CuO core–shell nanoparticles, improves the adhesion and durability of the coatings on aluminum alloy substrates. Experimental data from Tafel curve analysis and electrochemical impedance spectroscopy (EIS) confirm the superior corrosion resistance of the superhydrophobic modified aluminum alloy surface compared to untreated surfaces. Estimations indicate a significant reduction in corrosion rate after superhydrophobic treatment. Furthermore, an optical absorption spectra analysis of the core–shell nanoparticles demonstrates their suitability for photocatalytic applications, showcasing their potential contribution to enhancing the overall performance of the coated surfaces. This research underscores the promising approach of combining superhydrophobic properties with photocatalytic capabilities to develop advanced surface modification techniques for enhanced corrosion resistance and functional properties in diverse industrial settings.
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Yuhan Ren,Biao Zhang,Zhaoxin Zhong,Jian Ye,Jiawei Zhang,Zhiyong Fang,Feng Ye
In this study, monolithic Al 2 O 3 –SiO 2 aerogels with excellent thermal stability and high specific surface area were synthesized using boehmite nanorods (L=20–30 nm, D=3–5 nm). The high specific surface area of aerogels was maintained after calcination at 800 °C (663.54 m 2 /g), 1000 °C (486.91 m 2 /g), and 1100 °C (230.76 m 2 /g). The anti-sintering mechanism of the Al 2 O 3 -SiO 2 aerogels was discussed. Thanks to the composite of Al 2 O 3 -SiO 2 aerogel and mullite fibers, the disadvantages of brittleness and low strength of aerogel are overcome. The thermal conductivity of the composite is extremely low at 0.034 W/(m·K)-0.089 W/(m·K) (25 °C-1000 °C). Five muffle cycle back-temperature tests at 1000 °C and a butane blowtorch back-temperature test at 1350 °C also proved that the composites have excellent thermal insulation properties. Composites with excellent thermal insulation properties combined with lightweight, thinness, machinability, and good dielectric properties meet the need for high-temperature thermal insulating-wave transmitting integrated materials for hypersonic missile radomes.
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Waste and Biomass Valorization
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2024
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IF 2.6
Wang Jiahe,Lu Jinshan,Wang Hongzhi
The reutilization of marble sludge from the marble cutting and polishing process offers economic and environmental benefits. In this work, fly ash is used as an aluminosilicate source to prepare geopolymers with marble sludge. The crystal composition, gel structure, pore distribution, microstructure and Na + ion leaching behavior were investigated to determine the effects of multiscale fillers on the apparent density, compressive strength, and efflorescence performance of the geopolymers. The addition of graphene oxide (GO) filler catalytically promotes geopolymerization reactions, inhibits microcrack formation and increases the compressive strength, albeit with pronounced efflorescence. In contrast, the hydrophobic SiO 2 aerogel (SA) filler effectively eliminates the pores and hinders water permeability and Na + leaching, thus greatly improving the anti-efflorescence properties. The concentration of Na + ions in the leach solution follows an exponential relationship with leach time, indicating diffusion controlled leaching behavior. With the combination of 1‰ GO and 1% SA, the geopolymer achieves a compressive strength of 40.6 MPa and a surface contact angle of 99.1°. After the immersion efflorescence test, the geopolymer shows a mass loss of 4.3% and a strength loss of 7.2%, far superior to those of the unfilled geopolymer. The strengthening and improved anti-efflorescence properties are closely related to the densification and increased hydrophobicity of the geopolymers. The synergistic effect of different fillers provides a simple technical route to produce high strength and anti-efflorescence geopolymers with marble sludge, promising suitability for applications in paving and embankment blocks. Graphical Abstract
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FOOD CHEMISTRY
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2025
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IF 9.8
Chen Hu,Chao Yang,Bo Li,Bangzhu Peng
Consumption of contaminated wines is a significant source of ochratoxin A (OTA) intake in humans, yet existing techniques for OTA removal are inadequate. This study constructs a TiO 2 /SiO 2 /g-C 3 N 4 catalyst (TiSiMs-TCN) with a tubular structure, capable of efficiently removing OTA from both simulated and real wines under visible light irradiation. The results of experiments, characterizations, and theoretical calculations demonstrate that the incorporation of silica enhances the adsorption capacity for OTA, and the tubular structure improves the catalyst's photoelectric properties. The internal electric field between TiSiMs and TCN facilitates electron transfer and the generation of active species, rapidly degrading the adsorbed OTA and promoting the regeneration of active sites, thus maintaining continuous adsorption-photocatalysis synergy. The OTA degradation pathway was analyzed using the Fukui index, electrostatic potential distribution, and intermediate product identification. Toxicological experiments confirm that TiSiMs-TCN is a safe and stable material capable of effectively detoxifying OTA contamination.
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SEPARATION AND PURIFICATION TECHNOLOGY
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2025
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IF 9
Wei Liu,Daoyin Liu,Hongjian Tang,Zhenkun Sun,Lunbo Duan
Synthesis of efficient photocatalysts is essential for the removal of antibiotic-based contaminants from wastewater. In this work, novel Z-scheme (SiO 2 /TiO 2 )/Bi 2 WO 6 (SiTiBi) heterojunction photocatalysts are synthesized by atomic layer deposition and hydrothermal methods, and the photocatalytic performance is improved by constructing oxygen vacancies and internal electric field (IEF). 15-SiTiBi (15 wt% SiO 2 /TiO 2 ) exhibits excellent photocatalytic activity, with 89 % LVF degradation in 30 min and a degradation kinetic constant of 0.072 min −1 . In addition, based on free radical trapping, electron spin resonance, photoelectrochemical tests, and DFT calculations, show that oxygen vacancies enhance the light absorption, and IEF strengthens the separation and migration of photogenerated carriers. Finally, the degradation intermediates and degradation pathways of LVF are predicted using LC-MS and first-principles. This work provides an effective method for constructing interfacial structures that facilitate the separation of photogenerated carriers and promote antibiotic degradation.
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Journal of Coatings Technology and Research
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2025
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IF 2.8
Xu Yangbo,Shen Rulin,Zou Xiangfu,Tang Juntao,Gong Yanling,Wan Wenhu,Guo Haibo
The harsh and complex nature of the marine environment can easily compromise protective coatings and lead to corrosion of the carbon steel substrate. Therefore, a marine anticorrosion coating with synergistically enhanced self-healing, abrasion resistance, and corrosion resistance is studied in this work. Coaxial electrostatic spinning nanofibers with nylon 6 (PA6) as shell and two-component epoxy resin as core were modified with SiO 2 and then embedded in epoxy resin coatings to create self-healing anticorrosion coatings. Tensile test results demonstrated that the PA6 shell nanofibers increased the coating's tensile strength by 15%. Meanwhile, the abrasion resistance of the composite coating with 1%SiO 2 nanoparticle was enhanced by 33%. Tafel polarization curves showed that the inclusion of core-shell nanofibers in the coating resulted in a self-healing ability, with an impressive self-healing efficiency of 99%. Low-frequency impedance modulus of electrochemical impedance spectroscopy (EIS) results demonstrated an improvement of nearly two orders of magnitude compared to the pure epoxy coating. Experiments illustrated that the coatings developed in this study for marine anticorrosion exhibit a synergistic enhancement effect on self-healing performance, abrasion resistance, and corrosion resistance.
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PROGRESS IN ORGANIC COATINGS
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2025
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IF 7.3
Xue Fu,Shuyan Xu
Superhydrophobic coatings, inspired by lotus leaves, have gained significant interest due to their multifunctional properties. However, their mechanical wear resistance is often inadequate, resulting in a limited lifespan. This study aims to create a wear-resistant superhydrophobic composite coating using epoxy resin (EP) as a binder, along with SiO 2 modified by hexadecyltrimethoxysilane (HDTMS) and cellulose nanofibers (CNF) modified by KH570 to enhance performance synergistically. The preparation method is environmentally friendly and does not involve fluorine chemicals. A simple and efficient one-step spraying technique is employed to create a micro-nano hierarchical structure on the substrate surface. SiO 2 contributes to surface roughness, CNF serves as a toughening agent to form a three-dimensional network, and EP provides strong adhesion. This composite structure significantly improves the mechanical durability of the coating while preserving excellent superhydrophobic properties. The coating is compatible with various substrates and retains good hydrophobicity even after extensive abrasion and tape peeling. Additionally, the superhydrophobic coating demonstrates outstanding anti-fouling and self-cleaning capabilities, resistance to acids and bases, and strong adhesion. We believe this research offers innovative approaches for developing fluorine-free, wear-resistant superhydrophobic coatings.
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ACS Sustainable Chemistry & Engineering
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2025
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IF 7.3
Hao Li,Sen Xue,Qin Zhang,Feng Chen,Qiang Fu
Cellulose has the advantages of renewability and degradability, while cellulose’s rigid structure and hydrogen bonding limit its dissolution and application. Low-temperature alkali/urea solvents offer a green, low-cost solution but suffer from low solubility, high coagulation costs, and poor fiber strength. In this work, to address these problems, the high specific surface area and surface-rich hydroxyl groups of nano-SiO2 powders were used to modify the low-temperature alkali/urea solvent system. There are two alkali/urea solvent systems: LiOH/urea has better solubility but expensive and NaOH/urea is cheap but of less solubility. In the LiOH/urea system, it was found that the solubility of cellulose could be increased by 60.1% by addition of nano-SiO2 powder, and the gel temperature of the solution remained basically unchanged. By using the phytic acid coagulation system, the strength and elongation of regenerated cellulose fibers could reach 547.6 MPa and 18.7%, respectively. More importantly, in the low-cost NaOH/urea system, nano-SiO2 boosts solubility by 45.2%, regenerated cellulose fibers with 404 MPa strength, and 20.18% elongation by using the H2SO4/Na2SO4 coagulation system. Finally, the mechanism of action of nano-SiO2 is revealed, which provides a new idea for green dissolution and the high-performance regeneration of cellulose.
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CONSTRUCTION AND BUILDING MATERIALS
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2025
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IF 8
Chang Chen,Bao Xu,Huan Wang,Shaowu Jiu,Yanxin Chen,Yan Liu
Phase change materials offer potential for improving building energy efficiency through heat absorption/release during phase transition. This study develops novel inorganic hydrated salt@SiO 2 phase change microcapsules using modified eutectic hydrated salt as the core and a dual-component silica/nanosilica shell via the Pickering emulsion method. These microcapsules were incorporated into gypsum for forming functional composites. Comprehensive investigations were conducted to evaluate the thermal properties of the modified eutectic hydrated salts and the microcapsules, alongside the mechanical properties and thermal management capabilities of the composites. Optimized microcapsule properties: The optimized microcapsules exhibited a rough surface, an average size of 6.3 μm, a phase-change temperature of 21.31°C, and an enthalpy of 286.8 J/g. Remarkably, the enthalpy loss was limited to 0.4 % after 120 heating-cooling cycles. Composite performance: In the gypsum composites, 7-day compressive and flexural strengths peaked at 10.8 MPa and 5.3 MPa (2.0 wt% microcapsules), declining to 6.6 MPa and 3.5 MPa at 4.0 wt%. Infrared thermography confirmed effective thermal buffering: incorporating 4.0 wt% microcapsules reduced surface temperature by 4°C versus the control specimen after 480 s heating. Concurrently, thermal conductivity decreased by 32.8 % (measured at 4.0 wt% content), further enhancing potential for building thermal regulation. By delaying heat transfer through diurnal phase-change cycles, they directly reduce cooling loads in hot climates, enabling significant annual energy savings in air-conditioned buildings and advancing sustainable construction.
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MICROCHEMICAL JOURNAL
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2025
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IF 5.1
Zhongshun Wang,Qunyan Zhu,Chang Liu,Kun Chen,Yuheng Fu,Bingbing Xie,Lin Zhang,Wensheng Yang
Achieving highly sensitive surface-enhanced Raman scattering (SERS) detection requires precise collection of trace target analyte molecules into small hot spot regions. In this study, we propose a convenient and cost-effective method to construct a high-performance SERS platform based on the super-hydrophobic delivery (SHD) effect to overcome the diffusion limit during sample evaporation. A paper based super-hydrophobic substrate (PBSH substrate) was employed as a concentrator to enrich the analytes, along with SiO 2 @Au core-satellite structures (SiO 2 @Au CSSs) to form “molecule in hot spot” matrices. Benefiting from the SHD effect and the high SERS activity of SiO 2 @Au CSSs in three-dimensional space, we achieved excellent SERS sensitivity and reproducibility. This platform exhibits a good linear response for detecting Rhodamine 6G (R6G) across concentration ranges from nanomolar (10 −7 M) to femtomolar (10 −13 M) levels, with a low relative standard deviation (RSD) of 6.42 % observed across 30 randomly selected spots. Moreover, the platform enables sensitive detection of various contaminants and multicomponent residues of pesticides and organic dyes in real samples, exhibiting great practical potential in the field of food safety.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Lianxia Jing,Pengyu Zhang,Yanming Chen,Yunling Gao,Junxian Yun
A superhydrophobic PDMS/DTMS-SiO 2 @PLA membrane with a porous layered three-dimensional rough structure was obtained by a simple phase separation method for the preparation of polylactic acid (PLA) membrane with the addition of a layer of functionalized DTMS-SiO 2 nanoparticles. SEM, EDS, XPS, TGA, and FTIR were used to characterize the surface morphology and chemical composition of the PDMS/DTMS-SiO 2 @PLA membrane. The static water contact angle of the modified membrane could reach 160.7°. The high hydrophobicity remained after 50 abrasion experiments, and the WCA was still greater than 150° after 4 hours of immersion in different pH solutions. For petroleum ether, n-hexane, n-heptane, and isooctane mixtures with water, the modified membrane exhibited excellent oil-water separation capabilities in separation flux and efficiency. Meanwhile, the modified membrane also has good resistance to contamination and self-cleaning ability. Due to the advantages of simple preparation, degradable materials, mechanical stability, chemical resistance, excellent oil-water separation capability, good anti-pollution, and self-cleaning ability, superhydrophobic PDMS/DTMS-SiO 2 @PLA membrane can be applied to practical oil-water separation.
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