Nuclear Engineering and Technology
·
2026
·
IF 2.9
Zhengkui Zeng,Di Yan,Rongjia Wang,Isaac Kwasi Baidoo,Yugang Chen,Houhua Xiong,Jifu Du
To address lead-based material toxicity and limited low-energy (70–90 keV) X-ray shielding performance, this study developed a flexible silicone composite using methyl vinyl silicone rubber (VMQ) matrix. A Bi 2 O 3 -SiO 2 filler blend (50:10 wt%) was used to optimize its mechanical properties, which achieved 1.22 MPa tensile strength (about 307% improvement) and 373.5% at elongation break representing about 249% enhancement. The composite demonstrates a high linear attenuation coefficient of 1.7 9 cm -1 for 81 keV γ-rays and 0.375 cm -1 for 356 keV of a 133 Ba source. Thermal gravimetric analysis reveals exceptional stability for the Bi 2 O 3 /SiO 2 /VMQ (50:10:40 wt%) sample, showing 5% weight loss at 519°C and 63.2% residual mass at 800°C. The material combines effective radiation shielding (>99% attenuation at 2.75 cm for 81 keV), flexibility (>350% elongation), non-toxicity, and low density (1.08-1.84 g/cm 3 ) compared to lead (11.3 g/cm 3 ), offering a practical solution for nuclear safety. This research establishes foundational technology for producible, flexible radiation shielding, meeting demands in nuclear and medical applications.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2022
·
IF 5.518
Lei Liang,Yanling Wang,Bin Liu,Jincheng Gong,Wenjing Shi,Shinan Liang
The wettability of the reservoir is critical in the extraction of oil and gas resources as well as the flowback of working fluid. The movement of the liquid phase in the reservoir with water-wetting and oil-wetting has a high adhesion resistance, which is not conducive to the exploitation. To address the issues, we have developed a series of nanomaterials . Fluoropolymer nanofluids with core-shell structure were prepared from fluorinated monomers and nano-silica. The average size distribution is at the range of 260–370 nm, and the median size is about 160–190 nm. After the treatment of 0.10 wt% fluoropolymer nanofluids , the contact angle between core and water/n-hexadecane changed from 28°/0° to 147°/130°, the core surface free energy decreased from 66.6 mN/m to 0.92 mN/m, the water imbibition of the core decreased from 1.38 g to 0.18 g, and the injection balance pressure of displacement reduced from 7.0 MPa to 2.0 MPa. Wettability has been altered, and the core's wettability has changed from amphiphilicity to amphiphobicity. It has the potential to reduce the adhesion resistance between the fluid and the reservoir. Energy consumption is lowered while displacement and recovery efficiency are improved. Furthermore, the putative mechanism was examined using experiment findings and molecular modeling.
研究领域:
化学工程
·
石油工程
·
材料科学
·
流体力学
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高影响因子
APPLIED SURFACE SCIENCE
·
2019
·
IF 5.155
Jihong Liang,Umair Azhar,Pengchao Men,Jian Chen,Yining Liu,Jinxuan He,Bing Geng
Flake aluminum powders with excellent corrosive resistance properties are attractive materials in many technological applications. Here, a convenient strategy is employed to encapsulate the aluminum powders by using silicon-fluoropolymer composite film , by which the chemical resistance of aluminum-based pigments is significantly improved. A basic layer of SiO 2 is formed on the surface of the flake aluminum powders via sol-gel process. For the good compatibility between the silicon and fluorine, a uniform and dense layer of poly (trifluoroethyl methacrylate) (PTFEMA) is pasted tightly on the silicon layer initially formed by solution polymerization . Protected by this kind of composite silicon-fluoro-layer, the encapsulated aluminum powders were highly stable when they dipped into strongly alkaline solution (1.25 M, pH > 14). The morphology of composite layers on the aluminum powders are characterized by means of scanning electron microscopy (SEM). The structures of silicon-fluoropolymer composite film are tested by Fourier transform infrared spectroscopy (FTIR), energy dispersive spectroscopy (EDS) and X-ray photoelectron spectroscopy (XPS). The relationship between the usage of monomers and cross-linker on corrosion inhibition properties is systematically investigated. The phenomenon of hydrogen gas evolution is eliminated by the PTFEMA/SiO 2 hybrid films owing to an efficient fluorinated protective film on aluminum pigments.
研究领域:
材料科学
·
化学工程
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CHEMICAL PHYSICS LETTERS
·
2019
·
IF 1.901
Si-Ming Wu,Yi-Tian Wang,Nan Jiang,Shi-Tian Xiao,Jia-Xin Shi,Ying Wan,Zhi-Qiang Luo,Xiao-Yu Yang
Hierarchical structured mesoporous Co 3 O 4 /SiO 2 composites have been fabricated by the in-situ transformation of cobalt nanocrystals in the mesoporous silica. The hierarchical porous composites show good structural stability during the thermal treating process and demonstrate high crystallinity after phase transformation. The highly crystalline Co 3 O 4 /SiO 2 composite has uniform mesopores and exhibits good adsorption ability. This method offers a promising way to the design of hierarchical structured mesoporous materials with highly crystalline framework.
研究领域:
材料科学
·
化学工程
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ANALYST
·
2013
·Vol. 138
·期 18
·5495-5502
·
IF 3.969
Xiao-Mei He,Gang-Tian Zhu,Xiao-Shui Li,Bi-Feng Yuan,Zhi-Guo Shi,Yu-Qi Feng
SiO2–TiO2 composite fibers, prepared by electrospinning, were successfully applied to the rapid enrichment of phosphopeptides using a lab-in-syringe approach for the first time. Because of their large surface area, mesoporous structure, extraordinary length and appropriate Lewis acidity, the as-prepared SiO2–TiO2 composite fibers exhibited high selectivity and capacity in the enrichment of phosphopeptides from the digestion mixture of β-casein and bovine serum albumin (BSA), as well as human blood serum and nonfat milk. The targeted phosphopeptides could be easily enriched and detected even when the total amount of β-casein was decreased to only 10 fmol, indicating the high detection sensitivity of this method. In addition, the whole enrichment extraction procedure can be finished in less than 3 min, which can avoid or decrease the degradation of endogenous phosphoproteins by proteases released ex vivo during time-consuming treatments. The developed method is rapid, cost-effective, selective, sensitive, operationally simple, and does not require any harsh conditions and intricate equipment, providing an ideal candidate for the enrichment of phosphopeptides from complex biological samples either in the lab or in the field.
研究领域:
分析化学
·
蛋白质组学
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高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 12
·5007-5016
·
IF 1.6
Wang Weiran,Wang Zhifeng
Modified chitosan-coated nickel ferrite silica nanoparticles were prepared, characterized and experimented for the removal of U(VI). Adsorption amount was 125.30 mg g −1 at pH 5.0. The magnetic chitosan based composite could be successfully recycled from uranium aqueous phase. Finally, calculated data and analysis suggested that the adsorption behaviors of magnetic chitosan based nanoparticles can be explained by pseudo-second order kinetic model ( R 2 = 0.9915), which suggested the adsorption process was probably controlled by chemical adsorption, and langmuir model ( R 2 = 0.9816), which suggested the adsorption process was probably controlled by single-layer adsorption.
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ChemistrySelect
·
2023
·Vol. 8
·期 25
·e202301101
·
IF 2.1
Jiali Zhai,Huan Jiang
Graphical A novel solid-state fluorescent ZnO@SiO 2 nanocapsules powder with a fluorescence quantum yield of 26.8 % has been fabricated and successfully applied to fast latent fingerprint imaging. As advanced fingerprint powders, fluorescent materials generally provide high sensitivity and improved contrast on the pigments or patterned surface, with high resolution. In this study, ZnO nanoparticles are used as fluorescent materials and are homogeneously embedded into SiO 2 matrix to prepare ZnO@SiO 2 nanocapsules. Compared with conventional methods, ZnO@SiO 2 nanocapsules are fabricated using the transparent ethanol solution of ZnO NPs and n-Octyltriethoxysilane without any surfactants. Interestingly, a large number of ZnO NPs can be homogeneously embedded in the silica matrix, reducing the aggregation-induced quenching effect. The maximum emission of the ZnO@SiO 2 nanocapsules powder is located at 530 nm under 325 nm irradiation, and the photoluminescence intensity and the sensitivity of latent fingerprints development depend on the quantity of ZnO NPs in the composites. The prepared fluorescent ZnO@SiO 2 nanocapsules show outstanding property applied as effective fluorescent eikonogens for the high-sensitivity visualization of latent fingerprints on different porous and non-porous substrates. It has been demonstrated that ZnO@SiO 2 nanocapsules compounds combine the admirable adhesion of silica powders to fingerprint residues with the excellent photoluminescence properties of ZnO to form a promising light-emitting material for fingerprint.
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Aquaculture Reports
·
2022
·
IF 3.385
Jie Hu,Cang Wang,Hangtian Zu,Zaixi Fang,Haolong Zhou,Junlan Zhou,Shujun Wang,Mingsheng Lyu
In this study, we investigated the effects of Nano-SiO 2 , ultraviolet (UV) irradiation, and hydrogen peroxide on the growth of four marine aquatic pathogens as well as on their polysaccharide, biofilm formation, protein, and DNA. The results indicated that among all concentrations, 100 μg/L Nano-SiO 2 demonstrated the most inhibition of Edwardsiella tarda, Vibrio anguillarum , and Vibrio parahaemolyticus . Ultraviolet irradiation for 3 min had the most obvious inhibitory effect on E. tarda , but neither inhibitory nor promoting effects on the other three strains. High hydrogen peroxide concentrations had obvious inhibitory effects on all bacterial growth. Moreover, Nano-SiO 2 had some influence on bacterial polysaccharide properties and some amount of DNA splicing effect, but no effect was noted on proteins. At present, the recognized pathogenic genes of V. parahaemolyticus include tdh , trh , and tlh . We thus studied the effect of Nano-SiO 2 on these genes and then conducted infection experiments. The results showed that Nano-SiO 2 further reduced infection with V. parahaemolyticus in shrimp.
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CONSTRUCTION AND BUILDING MATERIALS
·
2025
·
IF 8
Chenhao He,Xiangguo Li,Yang Lv,Aming Xie,Xinping Li,Tao Sun,Gaoyue Wei,Meile Ding,Difei Leng
This study presents a novel cement-based composite exhibiting dual functionality for both absorbing electromagnetic waves and storing thermal energy. The composite was fabricated by incorporating nano-silica–encapsulated phase change microcapsules (n-OD@SiO 2 , MPCM) and a carbonyl iron powder/amorphous carbon composite absorber (CIP@SiO 2 @C). Its workability, hydration kinetics, electromagnetic properties, thermal behavior, mechanical performance, and internal microstructure were systematically characterized using isothermal calorimetry (TAM), a microwave vector network analyzer (VNA), differential scanning calorimetry (DSC), scanning electron microscopy (SEM) and three-dimensional X-ray microtomography (Micro-CT). The results show that the combined addition of MPCM and CIP@SiO 2 @C markedly enhances both thermal regulation and electromagnetic wave absorption. The composite containing 20 vol% MPCM and 10 wt% CIP@SiO 2 @C achieved optimal electromagnetic performance, with absorption rates exceeding 80 % across nearly the entire 2–18 GHz and surpassing 85 % within 8–18 GHz. This formulation also demonstrated outstanding thermal regulation, reducing the heating rate by 73 % compared with ordinary cement. Although its mechanical strength was slightly lower than that of plain cement, the optimized composite maintained a 28-day compressive strength of 42.6 MPa, indicating satisfactory structural integrity. The findings underscore the success of the proposed cement-based composite in electromagnetic wave attenuation and thermal management, highlighting its strong potential for applications in electromagnetic pollution mitigation and energy-efficient building materials.
研究领域:
材料科学
·
建筑工程
·
电磁功能材料
·
热能存储
·
土木基础设施
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高影响因子
CONSTRUCTION AND BUILDING MATERIALS
·
2026
·
IF 8
Yuzhao Ma,Muqing Li,Aifang Pan,Xiaofeng Yang,Hudie Yuan,Dahong Chen
The rapid development of electronic devices is increasing electromagnetic pollution, raising demand for efficient electromagnetic wave absorption materials in commercial applications. Low-cost SiO₂/graphite glass ceramics with excellent EMW absorption and load-bearing capacity were fabricated using amorphous SiO₂, recycled from Baihe pyrite slag, showing potential for use as EMW absorbing building exterior walls decoration layer material. The effects of sintering temperature, graphite content, and fluxing agent addition on ceramic preparation were investigated. XRD, SEM, and EDS analyses confirmed phase composition and microstructural evolution during fabrication. Mechanical property of samples showed that adding a small amount of graphite improves crack propagation resistance and enhances mechanical properties, with bending strength of glass ceramics with 10 % graphite adding reached 18.3 MPa. However, further increasing graphite content reduces the material's mechanical properties. The EMW absorption of SiO 2 /graphite glass ceramics with varying graphite contents was studied over 2–18 GHz. Optimal performance occurs at 20 % graphite content, achieving a minimum reflection loss (RL min ) of –28.4 dB and an effective absorption bandwidth of 3.4 GHz, due to impedance matching ability. Overall, the 20 % graphite composition offers excellent EMW absorption (RL min =–28.4 dB) and good mechanical strength. The use of SiO 2 derived from Baihe pyrite slag to fabricate EMW absorbable glass ceramics enables tailings recycling, reduces environmental pollution, and lowers production costs for load-bearing EMW absorbing materials, supporting economic circularity.
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ENERGY AND BUILDINGS
·
2019
·
IF 4.495
Yong Li,Qianru Liu,Yanfeng Liu,Dengjia Wang,Wang Song,Yaowen Chen,Jiaping Liu
Development of phase change materials (PCMs) for thermal energy storage in building envelopes, is a promising method of energy utilization and retention. In the present study, three different kinds of nano-SiO 2 (NS) were introduced to CaCl 2 •6H 2 O to obtain form-stable phase change materials (FSPCMs) with favorable thermal properties and non-flammability. The results of leakage tests show that the maximum CaCl 2 •6H 2 O mass fractions in FSPCMs containing NS1, NS2 and NS3, were 75%, 73% and 70%, respectively. There were no chemical reactions observed between CaCl 2 •6H 2 O and nano-SiO 2 , and CaCl 2 •6H 2 O was uniformly dispersed in the pores and on the surfaces of nano-SiO 2 . Differential scanning calorimeter (DSC) results show a lower melting temperature for FSPCMs with smaller diameter nano-SiO 2 species, with latent heats equivalent to the calculated values based on the mass fraction of CaCl 2 •6H 2 O in the FSPCMs. Among the three types of FSPCMs, CaCl 2 •6H 2 O(75%)/NS1 FSPCM exhibited the highest latent heat of 148.2 J/g with a phase change temperature of 25.1°C. Thermogravimetric analysis and thermal cycling tests verified that FSPCMs possess good thermal stability and reliability. Smaller nano-SiO 2 pore diameter caused a downward shift in the thermal conductivity of FSPCMs. The results of thermal performance tests using a laboratory-scale test chamber, show that FSPCMs, in particular CaCl 2 •6H 2 O(75%)/NS1 FSPCM, effectively decreased the indoor peak temperature during the heating process and extended the duration of heat preservation during the cooling process, further supporting their valuable potential as candidates for use in building energy efficiency applications.
研究领域:
建筑材料
·
能源工程
·
化学工程
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高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Yanghui Liu,Jian Zhou,Zhangbin Ji,Fengling Zhuo,Shengyu Wen,Yiqin Chen,YongQing Fu,Huigao Duan
Humidity sensing and water molecule monitoring have become hot research topics attributed to their potential applications in monitoring breathing/physiological conditions of humans, air conditioning in greenhouses, and soil moisture in agriculture. However, there is a huge challenge for highly sensitive and precision humidity detection with wireless and fast responsive capabilities. In this work, a hybrid/synergistic strategy was proposed using a LiNbO3/SiO2/SiC heterostructure to generate shear-horizontal (SH) surface acoustic waves (SAWs) and using a nanocomposite of polyethylenimine-silicon dioxide nanoparticles (PEI-SiO2 NPs) to form a sensitive layer, thus achieving an ultrahigh sensitivity of SAW humidity sensors. Ultrahigh frequencies (1∼15 GHz) of SAW devices were obtained on a high-velocity heterostructure of LiNbO3/SiO2/SiC. Among the multimodal wave modes, we selected SH waves for humidity sensing and achieved a high mass-sensitivity of 5383 MHz · mm2 · μg–1. With the PEI-SiO2 NP composite as the sensitive layer, an ultrahigh sensitivity of 2.02 MHz/% RH was obtained, which is two orders of magnitude higher than those of the conventional SAW humidity sensors (∼202.5 MHz frequency) within a humidity range of 20–80% RH.
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