APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
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2021
·Vol. 127
·期 4
·1-10
·
IF 2.584
Mao Tingjie,Yang Xiaoling,He Yingzhi,Wang Tingting,Liang Qiu,Zhang Guobang,Tong Yanhua
Reinforcing light harvesting is an effective means to improve photocatalytic efficiency of semiconductors. In this study, carbon-quantum-dot-modified BiOBr mixed with SiO 2 nanospheres (BiOBr/CQDs + SiO 2 ) were prepared via stepwise chemical precipitation route. The characterizations of X-ray diffraction, field-emission scanning electron microscopy and energy-dispersive X-ray apparatus demonstrated that the as-prepared BiOBr/CQDs + SiO 2 displayed nanosheets-building spherelike hierarchical nanostructures mixing with dispersive SiO 2 nanospheres. Control photocatalytic degradation of orange II under natural sunlight illumination indicated that the presence of SiO 2 nanospheres could further promote the photocatalytic behaviors of BiOBr/CQDs apart from CQDs. Diffuse reflection spectrum demonstrated that SiO 2 nanospheres were capable of reflecting UV − Vis light near to 100%. The possible mechanism for the enhanced light-absorption surface of suspending hierarchical photocatalyst in presence of SiO 2 nanospheres was proposed via light propagation over suspending SiO 2 nanospheres under vertical light illumination. Our method for enhancing photocatalytic efficiency provided a general method to enhance light harvesting of every suspending two- or three-dimensional photocatalysts.
研究领域:
材料科学
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环境科学
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DOI
高影响因子
PROGRESS IN ORGANIC COATINGS
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2024
·
IF 6.5
Biao Gu,Hanzhe Song,Xiaodong Jiang,Changhai Xu,Jinmei Du
In recent years, SiO 2 has gained widespread application in the hydrophobic finishing of cotton textiles due to its exceptional versatility and robust controllability. However, the inherent negative charge on the surface of SiO 2 results in inadequate adhesion on fabrics and incompatibility with cationic hydrophobic agents. In this work, a cationic nano-silica (DI-SiO 2 ) material was prepared by introducing cationic groups and reactive groups onto the silica surface using silane coupling agents to enhance the compatibility between silica and cationic polyurethane acrylate as well as the durability of hydrophobic cotton fabrics. It was found that DI-SiO 2 exhibits a significantly high zeta potential (40 mV ± 5 mV) and excellent compatibility in polyurethane acrylate dispersions without obvious demulsification and sedimentation after 24 h of storage. The as-prepared water-repellent agent consisting of DI-SiO 2 and polyurethane acrylate could chemically bond to cotton fabrics, thereby forming a uniform, robust, and long-lasting water-repellent film on the fabric surface with the water contact angle (WCA) exceeding 150°. In addition, the hydrophobic cotton fabric exhibited superior robustness and durability, maintaining high water repellency (WCA > 125°) after treatment with acids, alkalis, organic solvents, UV irradiation, abrasion, and repeated washing. More importantly, the modified cotton fabric possesses excellent self-cleaning, breathability, moisture permeability, and oil-water separation properties. These outstanding features render it highly valuable for applications in fields such as mountaineering and camping.
研究领域:
纺织科学与工程
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材料科学与工程
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产品关联
DOI
高影响因子
ACS Agricultural Science & Technology
·
2024
·
IF 2.3
Leiyu Yang,Yifan Luo,Yapeng Chen,Sanyan Wang,Huashan Wang,Meiyi Wang
Fomesafen serves as a widely employed selective herbicide for addressing broadleaf weeds, but the short duration of efficacy limits utilization efficiency. There exists an exigent requirement to extend its efficacy through controlled release mechanisms. Fomesafen@SiO2-starch microspheres with α-amylase responsiveness were synthesized through the direct binding of drug-loaded silica microspheres and modified starch. This fabrication method capitalizes on the enzymatic degradation potential of the outer starch layer by amylase. In contrast with earlier analogous structures that exhibited inferior drug loading efficacy, the prepared fomesafen@SiO2-starch microspheres demonstrated a significantly enhanced drug loading capacity of up to 35.7%. Furthermore, in comparison to fomesafen technical, the prepared fomesafen@SiO2-starch microspheres exhibited a notable capacity to mitigate the photolysis of fomesafen through the utilization of the starch outer layer. Additionally, the fomesafen@SiO2-starch microspheres demonstrated favorable wettability and adhesive properties. At the recommended dosage, the herbicidal efficacy of fomesafen@SiO2-starch microspheres against Brassica napus L. and Portulaca oleracea L. over 14 days was observed to be comparable to that of the fomesafen technical, concurrently exhibiting a degree of sustained release. These findings underscore the potential of microspheres in regulating the release of fomesafen, thereby presenting a promising avenue for the development of sustainable drug delivery systems in agriculture.
研究领域:
农业科学
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材料科学
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植物保护学
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产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2024
·
IF 7.7
Longxiang Zhan,Huan Chen,Xichen Yu,Zhuqun Shi,Chuanxi Xiong,Quanling Yang
High-performance polymer-based dielectric materials have attracted much attention in the field of energy storage due to high breakdown field strength and low cost. However, partial polymer-based materials are derived from traditional fossil energy derivatives, which are characterized by non-renewable and low dielectric constants, which are not conducive to the improvement of energy storage. In this paper, dissolved chitin through alkali/urea system is composited with SiO 2 prepared by electrostatic spinning. The maximum discharge energy density of the fiber composite film reaches 4.34 J cm −3 , which is 1.6 times higher than that of the micron particle composite film (2.8 J cm −3 ) and 1.9 times higher than that of the pure chitin film. The high aspect ratio and low concentration of silica filler effectively improved the breakdown field strength. In addition, the thermal stability was improved. This study paves the way for the application of bio-based materials in high-performance dielectrics.
研究领域:
材料科学
·
生物学
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产品关联
DOI
PubMed
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Dandan Jia,Jie Zhao,Rui Yan,Hongyi Gao,Zhaolin Fu,Zhongpeng Zhu,Zhiping Tao
The catalytic stability has always been a bottleneck of many reactions in industrial production. The preparation of long-life hydrogenation catalysts has been a hot research topic. Herein, Ni-ZIF was first grown in situ on the surface of SiO2. N-doped Ni/C nanoparticles were uniformly distributed on the SiO2 support after the subsequent annealing process. The uniform dispersion of Ni-ZIF contributed to the high dispersion of the active metal, and the highly dispersed Ni nanoparticles were free from thick carbon layers. The highly dispersed and fully exposed Ni determined its excellent low-temperature hydrogenation activity, which was critical for the extension of the catalyst lifetime. The presence of carbon and nitrogen was also beneficial to improve the stability of the catalyst. The N-doped SiO2@Ni/C catalyst exhibited excellent stability toward the hydrogenation of DCPD under mild condition. 100% DCPD conversion and >90% THDCPD selectivity were maintained after 144 h of continuous fixed-bed operation under GHSV of 2 h–1 at 60–90 °C.
研究领域:
催化化学
·
材料科学
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2024
·
IF 6.3
Peng Tang,Xueying Zhao,Jiawei Du,Mang Li,Haining Qian,Huiqi Ren,Xuyang Zhang,Guohua Wu,Xiangwei Wang
In this study, hollow Co@SiO 2 @PPy composites with excellent electromagnetic wave (EMW) absorption performance were successfully synthesized. The monodisperse hollow Co microspheres were prepared using a solvent-thermal method. The microspheres were then coated with an SiO 2 layer by a modified Stöber method. Finally, the SiO 2 layer was surface-coated by polypyrrole (PPy) through in-situ polymerization to obtain Co@SiO 2 @PPy composite materials with hollow core–shell structures. The prepared CSP2 composite achieved a minimum reflection loss (RL min ) of −65.83 dB at 1.86 mm, demonstrating an effective absorption bandwidth (EAB) of 4.84 GHz. The CSP3 composite achieved a widest EAB (EAB max ) of 5.4 GHz at a thickness of 1.83 mm, while simultaneously maintaining the RL level at −50.70 dB. Additionally, it demonstrated an RL min value of −61.66 dB with a thickness as thin as 1.66 mm. The observed shift of FTIR absorption peaks by 20 cm −1 in the PPy ring provides compelling evidence for the involvement of multilayered structures in polarization loss. The SiO 2 layer not only enhances the interface polarization but also prevents corrosion of the Co core by acidic solutions. The exceptional EMW absorption characteristics can be attributed to the effective impedance matching and the combined effect of magnetic and dielectric losses.
研究领域:
材料科学
·
电磁学
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产品关联
DOI
高影响因子
Journal of Science-Advanced Materials and Devices
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2025
·
IF 6.8
Baiyuan Tian,Chuang Zhu,Manting Gu,Minhao Xu,Wenxuan He
This study aims to discover innovative thermal storage materials that fulfill the specifications of concentrated solar power systems. Thermal storage materials based on ternary eutectic (Hitec) with nano-SiO 2 and nano-MgO are investigated. Simultaneous thermal analysis and laser flash analysis are used to study the main properties of materials. The results indicate that the inclusion of nano-SiO 2 and nano-MgO reduces the melting point while enhancing the latent heat of the base salt. Doping the base salt with 0.3 wt.% nano-SiO 2 and 0.7 wt.% nano-MgO results in molten salt nanocomposites with an average specific heat of 2.16 J/(g⋅K), which is 54.3% higher than that of the base salt. This surpasses the specific heat of the base salt mixed with a single type of nanoparticle. The thermal conductivity of this nanocomposite is increased by 13.13% to 0.836 W/(m⋅K) compared to the base salt. Furthermore, this study demonstrated that the effect of interfacial thermal resistance on specific heat capacity and heat transfer characteristic is opposite. While the nanoparticles can increase the specific heat capacity of the molten salt, they can also reduce the heat transfer rate within this material.
研究领域:
材料科学
·
能源工程
·
纳米技术
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产品关联
DOI
高影响因子
Catalysts
·
2026
·Vol. 16
·期 6
·528
·
IF 4.5
Shaohua Chai,Minke Huang,Shuangde Li,Wenbo Zhang,Baikang Zhu,Yunfa Chen
Plasma-catalytic oxidation is a promising approach for the abatement of volatile organic compounds (VOCs), yet its efficiency is often limited by the ineffective utilization of plasma-generated reactive oxygen species and incomplete oxidation pathways. In this work, a composite catalyst was constructed by integrating spinel-type NiCo2O4with three-dimensional cubic mesoporous KIT-6 to couple efficient mass transfer with redox-active surface functionality for plasma-catalytic degradation of toluene. The performance of NiCo/KIT-6 was systematically evaluated in a dielectric barrier discharge (DBD) reactor and compared with Ni/KIT-6, Co/KIT-6, and NTP-only systems. XPS, O2-TPD, H2-TPR, and apparent dielectric measurements were employed to elucidate catalyst properties relevant to plasma–surface interactions. NiCo/KIT-6 exhibits superior overall performance in terms of toluene conversion, COxselectivity, and CO2selectivity over a wide range of specific input energies. This enhancement is closely associated with the integrated regulation of surface redox properties, oxygen activation capability, and apparent dielectric response by the NiCo2O4/KIT-6 composite structure, which may promote reactive oxygen utilization and facilitates effective plasma–surface redox processes. These results provide insights into the rational design of composite catalysts for plasma-assisted oxidation of aromatic VOCs.
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DOI
高影响因子
Journal of the Korean Ceramic Society
·
2026
·
IF 4.4
Yan Long-Pan,Zhang Guo-Hua
α-Si 3 N 4 and SiC powders were prepared from reaction between SiO 2 and carbon black in different atmosphere. The effects of atmospheres, raw material particle sizes, and C/SiO 2 molar ratio on the syntheses of Si 3 N 4 and SiC powders were investigated. The optimal parameters for preparing α-Si 3 N 4 were determined to be a temperature of 1500 °C for 8 h with a C/SiO 2 molar ratio of 4.0. In addition, the results demonstrated that H 2 atmosphere facilitated SiC synthesis by lowering its formation temperature. SiC powders were synthesized under a flowing H 2 atmosphere at 1500 °C for 5 h. N 2 -H 2 mixed atmosphere inhibited Si 3 N 4 formation while promoting SiC synthesis, with increasing SiC content as the H 2 partial pressure rose. Meanwhile, the size reduction of raw materials was conducive to promoting the formation of Si 3 N 4 and SiC and reducing the granularity of the final product. However, if the particle size of the raw materials was too fine, the product will tend to agglomerate.
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DOI
高影响因子
OPTICS COMMUNICATIONS
·
2026
·
IF 2.7
Haiyu Tian,Haidong Qi,Yongjun Zhang,Yaxin Wang,Xiaoyu Zhao,Renxian Gao
Surface-enhanced Raman scattering (SERS) is a powerful surface analysis technique that significantly amplifies the Raman scattering signals of molecules adsorbed onto metallic nanostructures, enabling highly sensitive detection of the analytes. The development of low-cost, high-performance SERS substrates through facile and straightforward fabrication methods represents a challenging and highly rewarding endeavor. Here, we develop a suspended sandwich Ag/SiO 2 /Ag nanopore array structure based on template-assisted method with significant plasma coupling effects, which shows an ultra-low detection limit (LOD of 2.91 × 10 −11 mol/L) for 4-MBA molecules, excellent sensitivity (EF = 5.76 × 10 8 ) and high uniformity and stability. COMSOL simulation confirms the electromagnetic coupling in the sandwich structure in addition to the hotspots along the nanopore brims. The proposed SERS substrate enables quantitative detection of glyphosate with the concentration down to 4.66 × 10 −9 mol/L and fulfills the requirements for monitoring pesticide residues.
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产品关联
DOI
高影响因子
JOURNAL OF ELECTRONIC MATERIALS
·
2026
·
IF 2.8
Qin Xueying,Jiang Jia,Yin Shuang,Zhang Yeming,Wan Wei
The development of calcium copper titanate (CaCu 3 Ti 4 O 12 , CCTO) ceramics is often hindered by their high dielectric loss, which limits practical applications. In this work, CCTO powder with tailored micrometer-sized particles, synthesized via a Na 2 SO 4 molten-salt method, was used to fabricate nano-SiO 2 -doped ceramics through an environmentally friendly, water-based gelcasting process with glutinous rice flour as a nontoxic binder. This approach enabled stable slurry processing and effective microstructural control. The incorporation of 3.5 wt.% nano-SiO 2 yielded optimal dielectric performance, achieving a high dielectric constant of 8091 and a significantly reduced loss tangent of 0.08 at 1 kHz; this represents a 71.4% reduction in loss compared to the undoped sample. Microstructural and electrical analyses confirmed that the nano-SiO 2 predominantly segregated at the grain boundaries, forming a continuous amorphous insulating layer. This phase enhanced grain boundary resistivity, optimized the electrical heterogeneity, and substantially improved the frequency and temperature stability of the dielectric properties. This study demonstrates that nontoxic gelcasting combined with nano-SiO 2 doping is an effective and sustainable strategy for tailoring the dielectric properties of CCTO ceramics toward high-performance electronic applications by optimizing the internal barrier layer capacitor structure.
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DOI
高影响因子
Colloid and Interface Science Communications
·
2026
·
IF 6.7
Liukui Zhu,Zunqing Liu,Yinggang Liu,Liang Song,Ping Zheng,Wei Chen,Lianxia Ma
Highly transparent and hydrophobic polyimide (PI) films are attractive for advanced optoelectronic and flexible electronic devices, but their performance is often limited by weak organic–inorganic interactions and nanoparticle aggregation. In this work, a chain-end-mediated interfacial design was developed by combining IPTS-mediated PI/SiO 2 coupling with subsequent PFOTES surface fluorination. This sequential interface/surface regulation provided a practical route to jointly improve transparency, hydrophobicity, and thermo-mechanical performance in PI nanocomposite films. The optimized PI-Z2F film exhibited a transmittance at 500 nm (T₅₀₀) of 90.6%, a water contact angle of 114°, a glass-transition temperature (Tg) of 326 °C, and a tensile strength of 165 MPa. These results indicate that coordinated interfacial construction and surface fluorination provide an effective route to balancing hydrophobicity, optical transparency, and thermo-mechanical performance in PI nanocomposite films.
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DOI
高影响因子
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