Materials
·
2020
·Vol. 13
·期 21
·5004
·
IF 3.057
Tianyu Wang,Cong Zeng
A great number of urban underground concrete water drainage systems in China are facing challenges of corrosion, blockage, and leakage. This could result in engineering accidents such as urban inland inundation, pipeline collapse, leakage, and blockage. The common contributing factors for pipeline leakage and blockage are the porous structures and the perishable surfaces of concrete pipes. To address these issues, we synthesized superhydrophobic coating materials such as SiO2aerosol, bisphenol A diglycidyl ether (DGEBA), and N-β-aminoethyl-γ-aminopropyltrimethoxysilane (AEAPTS). Our superhydrophobic coating on cement-based surfaces presents good waterproof ability, mechanical stability, and self-cleaning properties. Test results show that the superhydrophobic coating exhibits higher water discharge capacity and survivability to corrosive underground water drainage pipeline environments. Hence, this SiO2aerosol @ bisphenol A diglycidyl ether coating possesses enormous potential in surface modification of pipeline rehabilitation materials.Keywords:superhydrophobicity;SiO2aerosol @ bisphenol A diglycidyl ether coating;water drainage pipe;cement-based materials
研究领域:
土木工程
·
材料科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
LANGMUIR
·
2017
·
IF 3.833
Lei Bao,Zihan Ji,Hongning Wang,Ruoyu Chen
Antireflective coatings with superhydrophobic, self-cleaning, and wide-spectrum high-transmittance properties and good mechanical strength have important practical value. In this research, hollow nanorod-like MgF2 sols with different void volumes were prepared by a template-free solvothermal method to further obtain hollow nanorod-like MgF2 crystals with an ultralow refractive index of 1.14. Besides, a MgF2 coating with an adjustable refractive index of 1.10–1.35 was also prepared by the template-free solvothermal method. Then through the combination of base/acid two-step-catalyzed TEOS and hydroxyl modification on the surface of nanosilica spheres, the SiO2 coating with good mechanical strength, a flat surface, and a refractive index of 1.30–1.45 was obtained. Double-layer broadband antireflective coatings with an average transmittance of 99.6% at 400–1400 nm were designed using the relevant optical theory. After the coating thickness was optimized by the dip-coating method, the double-layer antireflective coatings, whose parameters were consistent with those designed by the theory, were obtained. The bottom layer was a SiO2 coating with a refractive index of 1.34 and a thickness of 155 nm, and the top layer was a hollow rodlike MgF2 coating with a refractive index of 1.10 and a thickness of 165 nm. The average transmittance of the obtained MgF2–SiO2 antireflective coatings was 99.1% at 400–1400 nm, which was close to the theoretical value. The hydrophobic angle of the coating surface reached 119° at first, and the angle further reached 152° after conducting surface modification by PFOTES. In addition, because the porosity of the coating surface was only 10.7%, the pencil hardness of the coating surface was 5 H and the critical load Lc was 27.05 N. In summary, the obtained antireflective coatings possessed superhydrophobic, self-cleaning, and wide-spectrum high-transmittance properties and good mechanical strength.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Xinhong Qi,Xiangcun Li,Bo Chen,Huilan Lu,Le Wang,Gaohong He
Catalyst-containing nanoreactors have attracted considerable attention for specific applications. Here, we initially report preparation of PtNi@SiO2 hollow microspheres based on confined catalysis. The previous encapsulation of dispersed Pt nanoparticles (NPs) in hollow silica microspheres ensures the formation of Pt@Ni coreshell NPs inside the silica porous shell. Thus, the Pt NPs not only catalyze the reduction of Ni ions but also direct Ni deposition on the Pt cores to obtain Pt@Ni core–shell catalyst. It is worthy to point out that this synthetic approach helps to form a patchlike or thick Ni coating on Pt cores by controlling the penetration time of Ni ions from the bulk solution into the SiO2 microspheres (0.5, 1, 2, or 4 h). Notably, the Pt@Ni core–shell NPs with a patch-like Ni layer on Pt cores (0.5 and 1 h) show a higher H2 generation rate of 1221–1475 H2 mL min–1 g–1cat than the Pt@Ni NPs with a thick Ni layer (2 and 4 h, 920–1183 H2 mL min–1 g–1cat), and much higher than that of pure Pt NPs (224 H2 mL min–1 g–1cat). In addition, the catalyst possesses good stability and recyclability for H2 generation. The Pt@Ni core–shell NPs confined inside silica nanocapsules, with well-defined compositions and morphologies, high H2 generation rate, and recyclability, should be an ideal catalyst for specific applications in liquid phase reaction.
研究领域:
材料科学
·
催化化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2019
·Vol. 102
·期 12
·7098-7107
·
IF 3.094
Chong Gu,Changqing Guo,Xichao Dong,Zhiming Hu,Pengfei Wu,Zhiming Su,Yingxi Lu,Binbin Xu,Zhaoju Yu,Anhua Liu
In this work, novel core-shell structured Fe 3 Si@C/SiC/Fe 3 O 4 /SiO 2 nanoparticles were fabricated via a polymer-derived ceramic approach, starting from sol-like polycarbosilane-encapsulated polynuclear carbonyl iron nanoparticles and with pitch as an isolator to avoid aggregation during polymer-to-ceramic transformation. Elemental analysis, X-ray photoelectron spectroscopy, X-ray diffraction, transmission electron microscope, vibrating sample magnetometer and vector network analyzer were employed to investigate the composition, nano/microstructure, morphology, and dielectric/magnetic properties. The results show that the size of obtained Fe 3 Si@C/SiC/Fe 3 O 4 /SiO 2 nanoparticles is in the range of 2-200 nm. And the unique core-shell structure with the hetero-interface combined with simultaneous dielectric and magnetic loss endow Fe 3 Si@C/SiC/Fe 3 O 4 /SiO 2 nanoparticles outstanding electromagnetic (EM) wave absorbing performance. With a sample thickness of 4.5 mm, the minimum reflection coefficient (RC) of the composites Fe 3 Si@C/SiC/Fe 3 O 4 /SiO 2 mixed with paraffin wax reaches −44.7 dB, indicating that more than 99.99% EM waves can be attenuated by the composites. By adjusting the sample thicknesses, the effective bandwidth (the bandwidth of RC values lower than −10 dB) amounts 9.5 GHz (from 2.5 to 12.0 GHz), covering the whole C and X bands.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY
·
2019
·Vol. 103
·期 1
·199-205
·
IF 1.65
Zhang Wanying,Huang Yingnan,Gong Hua,Dang Fei,Zhou Dongmei
Metal dioxide nanoparticles (NPs) are produced in ever-increasing amounts and widely used in industrial, medical and consumer products. They may pose potential risks to the environment. In this study we quantitatively evaluated the phytoavailability of CeO 2 NPs, ZrO 2 NPs and SiO 2 NPs to wheat ( Triticum aestivum L.). Metal dioxide NPs showed distinct differences in uptake, with uptake rate constants of 90.2 ± 9.9, 12.2 ± 2.5, 0.4 ± 0.02 and 0.9 ± 0.1 L kg −1 h −1 for ZrO 2 NPs, CeO 2 NPs, SiO 2 NPs (13 nm) and SiO 2 NPs (25 nm), respectively. However, such difference cannot be generalized by single factor of NP characteristics and/or root damage. This study provides fundamental information for NP uptake by crop plants.
研究领域:
环境科学
·
植物学
✓ 已验证
DOI
PubMed
高影响因子
MACROMOLECULES
·
2024
·
IF 5.1
Yajing Yang,Fenglin Li,Dayin Sun,Yilan Ye,Zhenzhong Yang
A new method is proposed to large-scale synthesize reactive Janus inorganic/polymer colloidal dimers by electrostatics-mediated intramolecular crosslinking of the tethered diblock copolymer single-chain of PVSt-b-PmSt at an example inorganic NP of Fe3O4@SiO2. Tethering the single-chain is achieved by terminating the anionic living polymer onto the chloromethylphenyl- group capped NP. While the electrostatic interaction is introduced by complexation of the mercaptoacetic acid (MA) clicked PVSt block with 1-methylimidazole (MI), the intramolecular crosslinking is achieved with 1,6-hexanediisothiocyanate (HDI). The example dimer of cPVSt-b-PmSt-Fe3O4@SiO2 could be synthesized in a highly concentrated dispersion up to 100 mg/mL. The amphiphilic Janus colloidal dimer is effective to manipulate the stabilized emulsion droplets with a magnet. The parent colloidal dimer is highly reactive with residual chloromethylphenyl-, cyanate, and carboxylic acid groups at different sites to assist deriving a family of functional dimers by simple modifications.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Environmental Research and Public Health
·
2019
·Vol. 16
·期 3
·441
·
IF 2.468
Yanhua Qiu,Meilan Xu,Zongquan Sun,Helian Li
There is increasing concern regarding soils contaminated with polycyclic aromatic hydrocarbons (PAHs).In the present study, the remediation of soil spiked with PAHs was explored by the combination of soil washing with sodium dodecyl sulfate (SDS) and subsequent oxidation through persulfate (PS) activated by Fe2+, nanoscale zero-valent iron (nZVI), and SiO2-coated nZVI (SiO2/nZVI). Results demonstrated that the removal of phenanthrene (PHE), fluoranthene (FLU), and pyrene (PYR) by SDS is an efficient means for soil decontamination. At SDS concentration of 20 g/L, the removal efficiencies of PHE, PYR, and FLU were 37%, 40%, and 44%, respectively. For the degradation of PAHs and SDS in the soil washing effluents, the efficiencies of PS activated with SiO2/nZVI were not significantly different from those of PS activated with nZVI and Fe2+(p> 0.05). In practice, SiO2/nZVI is more preferable due to the improved antioxidation and dispersibility. At the dosage of 2 g/L (in the amount of iron) of SiO2/nZVI, the removal efficiencies of PHE, FLU, PYR, and SDS within 30 min of treatment were 75%, 85%, 87%, and 34%, respectively. The degradation of SDS was much lower than those of PAHs, which facilitated the recycle of SDS. Our findings suggest that PS activated with SiO2/nZVI is a promising method for the treatment of soil washing effluents containing SDS and PAHs.Keywords:soil remediation;PAHs;SDS;SiO2/nZVI;activated persulfate
研究领域:
环境科学
·
污染治理
✓ 已验证
产品关联
DOI
PubMed
高影响因子
NANOTECHNOLOGY
·
2021
·Vol. 32
·期 26
·265603
·
IF 3.874
Jianwei Zheng,Liying Zhang,Yang Li,Hong-Bin Sun,Gang Zhang,Qi Sun
Core–shell nanocomposites with a catalytic metal-organic framework (MOF) shell are more effective and stable than bare MOF. We have successfully designed an effective heterogeneous catalyst for the synthesis of benzimidazole by integrating acidic catalytic activity, and promoted the aerobic oxidation and magnetic recyclability of core–shell nanocomposite Fe3O4@SiO2@UiO-66. The Fe3O4@SiO2 core is encapsulated by the in situ-grown UiO-66 shell, and the UiO-66 shell retains the porous structure and crystallinity of UiO-66 with abundant exposed Lewis acid sites. It shows high catalytic ability for the synthesis of various benzimidazoles through the acid-catalyzed condensation and aerobic oxidation with in situ oxygen. The Fe3O4@SiO2 core provides magnetic recyclability of Fe3O4@SiO2@UiO-66, and maintains high catalytic ability and stability over six cycles.
研究领域:
材料科学
·
催化化学
·
有机合成
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Bionic Engineering
·
2020
·Vol. 17
·期 6
·1196-1208
·
IF 2.222
Yang Xiaona,Tian Limei,Wang Wei,Fan Yong,Sun Jiyu,Zhao Jie,Ren Luquan
The past decade has witnessed significant efforts in addressing the global metallic corrosion challenge, with a focus on avoiding or mitigating huge economic losses incurred by corrosion and on the development of protective coatings on metals. Herein, a synergistic anticorrosion coating with both superhydrophobicity and self-healing properties was reported, through a facile replica molding method by mixing the polyvinylidene fluoride (PVDF) matrix with nano-sized SiO 2 particles and 2-mercaptobenzothiazole (MBT) loaded halloysites (HNTs). The surface exhibits robust self-cleaning behavior under harsh conditions and high liquid repellence to withstand the osmosis of corrosive ions. The self-healing performance of the coating, due to the introduction of MBT-loaded HNTs, enhances the anticorrosion capability, which is still valid once the protective layer is damaged. Potentiodynamic polarization (PDP) and Electrochemical Impedance Spectroscopy (EIS) measurements demonstrate that the synergetic effects in anticorrosion performances significantly enhance the long-term corrosion protection of metals. Hence, this type of dual-action coating may find unique applications in metal corrosion resistance where both super-repellency and self-healing properties are desired.
研究领域:
材料科学
·
腐蚀与防护
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
Materials
·
2018
·Vol. 11
·期 2
·272
·
IF 2.467
Wenjuan Guo,Yanhong Wei,Zhao Dai,Guangping Chen,Yuanyuan Chu,Yifei Zhao
Based on the fluorescence resonance energy transfer (FRET) mechanism, fluorescent DNA probes were prepared with a novel DNA hairpin template method, with SiO2coated CdTe (CdTe/SiO2) core/shell nanoparticles used as the fluorescence energy donors and gold (Au) nanoparticles (AuNPs) as the energy acceptors. The nanostructure and energy donor/acceptor ratio in a probe were controlled with this method. The relationship between the nanostructure of the probes and FRET efficiency (quenching efficiency) were investigated. The results indicated that when the donor/acceptor ratios were 2:1, 1:1, and 1:2; the corresponding FRET efficiencies were about 33.6%, 57.5%, and 74.2%, respectively. The detection results indicated that the fluorescent recovery efficiency of the detecting system was linear when the concentration of the target DNA was about 0.0446–2.230 nmol/L. Moreover, the probes showed good sensitivity and stability in different buffer conditions with a low detection limit of about 0.106 nmol/L.Keywords:fluorescent DNA probes;CdTe/SiO2nanoparticles;Au nanoparticles;DNA hairpin template;nanostructure;quenching efficiency
研究领域:
生物化学
·
纳米生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2025
·
IF 6.3
Yunxiang Yuan,Hongchao Zhang,Xinyue Zhang,Erjie Yuan,Jingbing Wang,Sainan Wei
Cobalt-Nickel (CoNi) alloy particles are promising electromagnetic wave absorbers due to their strong magnetic loss and tunable morphology. To further enhance the performance, a multilayer core-shell-shell strategy was employed to construct a CoNi@SiO₂@ZnO composite. This design integrates magnetic and dielectric components to optimize impedance matching and introduce multiple interfacial polarizations. The synthesis involved a multi-step process: first, flower-like CoNi cores were synthesized via a polyol-mediated solvothermal process, whose branched architecture provides a large surface area and multiple reflection sites for enhanced microwave dissipation; then, the cores were amino-functionalized with APTES to facilitate the uniform deposition of a SiO₂ layer via a TEOS-based sol-gel process; finally, a seed-mediated method was employed. The resulting CoNi@SiO₂ particles were used as seeds, which were redispersed in an ethanol solution containing zinc ions and sodium hydroxide (NaOH) and subjected to a secondary solvothermal reaction. This successfully induced the epitaxial growth of a ZnO shell, ultimately yielding the final CoNi@SiO₂@ZnO composite material. The interlayer SiO₂ shell acts as a dielectric spacer, protects the magnetic core, and creates a distinct interface with the outer ZnO shell, collectively boosting interfacial polarization loss. The synergistic effect between the magnetic CoNi core and the dielectric double shells results in superior absorption performance. With a thickness of only 2.0 mm, the composite achieves a minimum reflection loss of −31.95 dB at 14.05 GHz and an effective absorption bandwidth (RL < −10 dB) of 6.59 GHz (11.41–18.00 GHz). This work demonstrates a rational route toward lightweight, high-efficiency, broadband absorbers under low-thickness conditions.
研究领域:
材料科学
·
电磁功能材料
·
纳米复合材料
·
微波吸收
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2025
·
IF 3.9
Xie Jun,Shi Xiaoyu,Liu Qi,Liu Ziqian,Qiao Chunying,Wang Qi,Xie Qing
The safety and reliability of dry-type film capacitors depend critically on the insulation performance of their dielectric films. Polypropylene (PP) films serve as primary dielectric materials due to their superior insulation properties, high mechanical strength, and excellent heat resistance. With increasing transmission voltages and equipment miniaturization trends, enhancing dielectric film insulation is crucial to ensure ultra-high-voltage (UHV) transmission security. This study incorporates a fluorinated functional layer–modified nanofiller, MMT@T@S-F (MMT@TiO 2 @SiO 2 -F), into PP films via bulk modification. Film breakdown tests demonstrate that at 25 °C, 50 °C, and 75 °C, PP/MMT@T@S-F films exhibit DC breakdown strength increases of 41.26%, 36.26%, and 32.98% respectively, compared to pure PP films. Micro-nano structural analysis reveals elevated interfacial energy levels in MMT@T@S-F nanoparticles. Simultaneously, the organic fluorine modification introduces high-energy charge traps into PP films, further reducing free-moving carriers while maintaining functional effectiveness at elevated temperatures. Graphical abstract
研究领域:
材料科学
·
电气工程
·
纳米复合材料
·
介电与绝缘
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）