PROGRESS IN ORGANIC COATINGS
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2025
·
IF 7.3
Yanhe Wu,Yushuai Cheng,Zhengke Wang
To address the toxicity, weight, and environmental limitations of lead-based radiation shields, this research develops a lightweight water-based radiation attenuation coating via facile integration of core-shell structured Gd@Si and Bi@Si fillers into a waterborne polyurethane/polyvinyl alcohol matrix. The tetraethyl orthosilicate-modified core-shell design enables uniform dispersion of high atomic number fillers (up to 70 wt%) while enhancing interfacial photon scattering. At 1.5 mm thickness, this coating achieves 99.1 % X-ray attenuation efficiency at 31 keV, which is comparable to 0.25 mm lead, and a γ-ray mass attenuation coefficient of 0.1408 cm 2 /g at 662 keV, exceeding lead by 44 %. Simultaneously, the composite maintains robust mechanical properties (683.9 % elongation at 50 wt% loading) and thermal stability (264.9 °C onset decomposition temperature). With a density 78 % lower than lead, inherent hydrophobicity (97.5° contact angle), and adhesion to diverse substrates, this sprayable coating offers a scalable, eco-friendly solution for radiation protection in medical, nuclear, and aerospace applications.
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高影响因子
Nature Communications
·
2016
·Vol. 7
·期 1
·1-7
·
IF 11.329
Zhu Lili,Lin Haiping,Li Youyong,Liao Fan,Lifshitz Yeshayahu,Sheng Minqi,Lee Shuit-Tong,Shao Mingwang
Currently, platinum-based electrocatalysts show the best performance for hydrogen evolution. All hydrogen evolution reaction catalysts should however obey Sabatier’s principle, that is, the adsorption energy of hydrogen to the catalyst surface should be neither too high nor too low to balance between hydrogen adsorption and desorption. To overcome the limitation of this principle, here we choose a composite (rhodium/silicon nanowire) catalyst, in which hydrogen adsorption occurs on rhodium with a large adsorption energy while hydrogen evolution occurs on silicon with a small adsorption energy. We show that the composite is stable with better hydrogen evolution activity than rhodium nanoparticles and even exceeding those of commercial platinum/carbon at high overpotentials. The results reveal that silicon plays a key role in the electrocatalysis. This work may thus open the door for the design and fabrication of electrocatalysts for high-efficiency electric energy to hydrogen energy conversion.
研究领域:
材料科学
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电化学
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DOI
PubMed
高影响因子
POLYMER
·
2024
·
IF 4.1
Zhenxian Chen,Yingying Wang,Zhao Li,Hui Zhang,Ming Wan,Nan Zheng,Bijin Xiong,Jintao Zhu
The cavitation behavior of polypropylene-silica (PP-silica) and high density polyethylene-silica (HDPE-silica) composites with varying silica content during uniaxial tension was investigated via in situ X-ray techniques. The introduction of silica was found to significantly influence the mechanical properties of the materials. Small-angle X-ray scattering (SAXS) was employed to determine the cavitation onset strain and to observe the evolution of cavity structures. Through model fitting, the size evolution of nanoscale cavities at the onset of cavitation was quantitatively characterized. Scanning electron microscopy (SEM) was utilized to examine the morphology before and after stretching, revealing that cavity structures primarily resulted from internal defects in the polymer matrix and interfacial debonding between silica and the polymer. The long axis of the nanoscale cavities at the onset of cavitation was perpendicular to the tensile direction, and further deformation led to the coalescence into micron-sized cavities with the long axis parallel to the tensile direction. Wide-angle X-ray scattering (WAXS) was used to characterize the microscale deformation process of crystals, showing that during stretching, the lamellae reoriented with the angle between their normal direction and the tensile direction gradually decreasing. Several sets of transition strains representing the plastic deformation were used to compare the microscale and macroscale deformation, elucidating the sequence and differentiation between crystal plastic deformation, cavitation, and yield in the two polymer materials. Intriguingly, both PP-silica and HDPE-silica composites exhibited optimal silica additions and initial structural parameters for regulating cavitation behavior. These findings offer significant guidance for the control of internal structures in porous separators in industrial production.
研究领域:
材料科学
·
聚合物工程
·
纳米技术
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DOI
高影响因子
Journal of Nanomaterials
·
2014
·
IF 1.611
Jiancheng Wang,Zhaoliang Peng,Bing Wang,Lina Han,Liping Chang,Weiren Bao,Gang Feng
A series of manganese salts (Mn(NO3)2, MnCl2, MnSO4, and Mn(Ac)2) and silicon materials (silica sand, silica sol, and tetraethyl orthosilicate) were used to synthesize Mn/Si complexes in supercritical water using a tube reactor. X-ray diffraction (XRD), X-ray photoelectron spectrometer (XPS), transmission electron microscopy (TEM), and scanning electron microscopy (SEM) were employed to characterize the structure and morphology of the solid products. It was found that MnO2, Mn2O3, and Mn2SiO4 could be obtained in supercritical water at 673 K in 5 minutes. The roles of both anions of manganese salts and silicon species in the formation of manganese silicon complexes were discussed. The inorganic manganese salt with the oxyacid radical could be easily decomposed to produce MnO2/SiO2 and Mn2O3/SiO2. It is interesting to found that Mn(Ac)2 can react with various types of silicon to produce Mn2SiO4. The hydroxyl groups of the SiO2 surface from different silicon sources enhance the reactivity of SiO2.
研究领域:
化学
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材料科学
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DOI
高影响因子
MATERIALS & DESIGN
·
2018
·
IF 4.525
Yuanyuan Jiang,Peiyao Yan,Yanjun Wang,Changlin Zhou,Jingxin Lei
In this paper, a series of novel form-stable phase change materials (PCMs) containing phosphorus and silica were prepared by transesterification of diethyl phosphite with 1-tetradecanol, 1-hexadecanol and 1-octadecanol, followed by ring-opening reaction and hydrolytic condensation of 2,3-epoxypropoxy propyltrimethoxysilane (silane coupler KH-560). The leakage of pure higher alcohols in molten state was effectively solved due to the support of cross-linked silicon network structure. The co-incorporated phosphorus and silicon would accelerate the formation of chars and improve the thermal stability and fire resistance. The chemical structure and crystalline structure of form-stable PCMs were determined by Fourier transform infrared spectroscopy (FT-IR) and X-ray diffraction (XRD). Differential scanning calorimeter (DSC) results indicate the melting points are in the range of 29 °C to 55 °C with the latent heat between 81.5 J/g to 116.9 J/g. Thermogravimetric (TG) analyses exhibit improved thermal stability of prepared PCMs compared to pure higher alcohols. The results of scanning electronic microscope (SEM), energy dispersive spectroscope (EDS) and FT-IR confirm the formation of phosphorus-rich and silicon-rich compact chars after thermal treatments.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2021
·
IF 9.229
Jiacheng Xing,Danhua Yuan,Hua Xie,Nan Wang,Hanbang Liu,Liping Yang,Yunpeng Xu,Zhongmin Liu
Ultraviolet (UV) radiation is closely related to people’s lives, but excess UV exposure has led to a series of problems. UV protection technology plays a vital role in our life. The most commonly adopted UV protection technology is to use UV-absorbing materials to make protective coatings, including sunscreen cream for human skin and sunscreen coating for materials. Conventional organic UV-protective coatings have low stability and are sensitive to heat, while inorganic UV-protective coating with highly efficient UV-protective performance usually need high processing temperatures and exhibit low transparency. Here, we report a Ti-PEG-Si cross-linked inorganic–organic hybrid material, which exhibits good UV-absorbing performance. By using these UV-absorbing materials, an efficient transparent UV-absorbing coating could be easily prepared at room temperature (298 K). The UV-absorbing coating is mainly composed of titanium and silicon connected by PEG200. PEG200 as a cross-linker can improve the UV-absorption performance of the coating and increase its visible light transmittance. At the same time, the existence of PEG200 can effectively increase the stability and elasticity of the coating and maintain its mechanical properties after UV irradiation. Furthermore, the coating could maintain highly UV-protective performance and could be transparent even after thermal treatment at high temperature (973 K). From this point of view, the hybrid materials have considerable application potential in next-generation UV protective coatings, especially with their utilization in heat-sensitive substrates or under high-temperature conditions.
研究领域:
材料科学
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化学工程
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DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Zhuqing Zhao,Muya Cai,Haijia Zhao,Qiang Ma,Hongwei Xie,Pengfei Xing,Yan xin Zhuang,Huayi Yin
Electrolysis of SiO2 to produce Si in MgCl2-based molten salt faces the challenge of generating chlorine gas at a graphite anode. Herein, we replace the graphite anode with a Mg2Si alloy anode that is paired with a C–SiO2 cathode in molten NaCl–KCl–MgCl2. During the paired electrolysis, the Mg2Si anode releases two Mg2+ ions into the electrolyte, resulting in Si nanostructures, while the C–SiO2 cathode is reduced to C–Si composites without generating SiC. Thus, both electrode reactions obtain desired products, which eliminates chlorine gas evolution and tailors the structure and composition of Si. In addition, the electrolytic Si nanostructures and C–Si composites show enhanced lithium-storage performances. The anodic Si nanostructures display a high initial Coulombic efficiency of 82.7% and achieve a cycling capacity of 1490 mAh g–1 300 cycles later under 2 A g–1. The cathodic C–Si composite that remains inside the carbon matrix derived from rice husks maintains a stable capacity of 780 mAh g–1 and 92.1% capacity retention after 200 cycles at 0.5 A g–1. In addition to Si-based anode materials, this study offers an economical and green paired electrolysis approach to preparing various functional materials.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
POLYMER ENGINEERING AND SCIENCE
·
2022
·Vol. 62
·期 8
·2610-2621
·
IF 2.573
Canqun Liu,Xiaosong Zhou,Xunfu Zhou,Wenke Ruan,Zhijun Wu
High thermal conductivity materials are an urgent need for high power, microelectronic components and equipment, but are limited by low thermal conductivity of the traditional silicone materials. 4-Cyano-4′-n-octyl biphenyl (8OCB) was synthesized to modify carbon nanotubes, and silicone was used as the matrix. In the curing process of the composite, an electric field was applied and the liquid crystal induced the orientation of carbon nanotubes in the direction of 8OCB liquid crystal. The morphology, structure and properties of modified carbon nanotubes and composites were characterized by Fourier transform infrared spectroscopy, polarized microscopy, transmission electron microscopy, thermal conductivity, and so on. The 8OCB liquid crystal can improve the dispersion of carbon nanotubes in silicone composites. When the mass fraction of multiwalled carbon nanotubes (MWCNTs) was 11 wt%, the thermal conductivity of 8OCB-MWCNTs/silicone composite after electric field was 2.39 W/(m K), which is 6.4 times that of MWCNTs/silicone composite after electric field and 15.5 times that of pure silicone matrix. A method to obtain highly ordered filled thermal conductive materials by applying an electric field to induce the orientation of carbon nanotubes is demonstrated.
研究领域:
材料科学
·
热传导技术
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高影响因子
JOURNAL OF PHYSICS AND CHEMISTRY OF SOLIDS
·
2022
·
IF 4.383
Xifeng Chen,Junjie Luo,Sara Khan,Ruiping Shi,Pengyang Li,Songlin Shi,Jianglei Hu,Fengwei Shi
In this paper, phosphomolybdic acid (HPMo) solution was chosen as a synthetic medium and active ingredient to replace hydrochloric acid, and the thick porous wall silicon composite based on HPMo (HPMo@OMS) was prepared by the one-step co-condensation method, which simplified the preparation process and improved the stability of the molecular sieve framework structure. The composite materials have the same ordered 2D hexagonal mesoporous structure as SBA-15. Compared to the traditional SBA-15 loaded HPMo (HPMo@SBA-15) synthesized in hydrochloric acid solution, the characterization results showed that the pore wall thickness of HPMo@OMS is about 2 nm thicker than the HPMo@SBA-15. Under mild experimental conditions, the catalyst has high desulfurization activity, and the removal rate of sulfur-containing substrate reaches 100%. In addition, after 10 desulfurization cycles, the Mo content of the composites recovered by centrifugation 13.74HPMo@OMS was only 1.67% by ICP-AES, the results after ten cycles of experiments showed that the removal rate of DBT could still reach 93.5%.
研究领域:
材料科学
·
催化化学
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2023
·
IF 15.1
Guangyuan Luo,Zhuoshi Li,Qingyun Liu,Shaoxia Guo,Xiaofeng Pei,Jing Lv,Shouying Huang,Yue Wang,Xinbin Ma
Higher alcohol synthesis (HAS) from syngas is a promising route for converting non-petroleum fossil energy resources into useful fuels or chemicals, while the design and preparation of highly efficient catalysts remain challenging. Herein, a series of Co 0 -Co 2 C catalysts supported on mesoporous carbon–silica composites were prepared for HAS. The composites were derived from carbon-silica nanocages, consisting of uniformly distributed carbon and silica species, which significantly affected the particle dispersion, phase evolution and catalytic performance. With increasing the carbon content, the initial carburization of cobalt was promoted, and some obtained Co 2 C tended to convert to hexagonal closest packed cobalt (hcp-Co, a highly active site for Fischer-Tropsch), boosting the CO dissociation and catalyst activity. While as the silica content increased, more Co 2 C phases can be stabilized, leading to enhanced Co 2 C/Co 0 ratio and ROH selectivity. As a result, the optimal 15Co/22Si@C catalyst achieved a ROH selectivity of 40.1% where 96.0 wt% was higher alcohols (HA), and a space time yield (STY) towards HA of 26.5 mmol·g cat −1 ·h −1 , which remarkably outperformed most of the reported Co-based catalysts in HAS. Moreover, the superior stability of over 250 h reaction was obtained, owing to the confinement effect and strong metal-support interaction provided by the mesoporous carbon–silica composites. This work may provide guidance for designing high-performance monometallic cobalt catalyst in HAS.
研究领域:
化学工程
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催化材料科学
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高影响因子
RSC Advances
·
2014
·Vol. 4
·期 67
·35769-35776
·
IF 3.708
Lei Hu,Aiqing Zhang,Kai Liu,Shan Lei,Guangxin Ou,Xinjian Cheng
Polyphosphazene/SiO2 composite membranes and porous polyphosphazene membranes were prepared and their properties were studied in detail. In this work, linear polyphosphazenes with 3-aminopropyltriethoxysilane (APTS) and n-butylamino side groups were prepared via the nucleophilic substitution reaction. The substituted polyphosphazenes were cross-linked by the hydrolysis of triethoxysilanes to form polyphosphazene/SiO2 composite membranes. When the as-prepared polyphosphazene/SiO2 composites were treated with HF, the silica dissolved and porous polyphosphazene membranes formed subsequently. Their structures and morphologies were studied by IR, DSA, DMA, XPS and SEM. And their mechanical properties were investigated as well. It could be seen that the thermal stability, the contact angles and the mechanical properties changed with the ratio of APTS. Namely, the contact angle changed from 74° to 96°, and the initial decomposition temperature increased from 170 °C to 225 °C when the ratio of APTS increased. Besides, the glass transition temperature increased from −48 °C to 31 °C after the membranes were cross-linked.
研究领域:
材料科学
·
化学工程
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DOI
高影响因子
Scientific Reports
·
2025
·Vol. 15
·期 1
·1-16
·
IF 3.9
Zhang Fengrong,Liu Luxing,Zhang Cuilan,Shang Dawei,Wu Lishun
A novel adsorbent ZnAl–LDHs/SiO 2 (ZA/SiO 2 ) was prepared by blending urea mixture of ZnSO 4 and Al 2 (SO 4 ) 3 while using SiO 2 as a support form. The adsorption properties of ZA/SiO 2 for the removal of toxic metal ions (Cu(II) and Cr(VI)) from water were evaluated. By batch experiment method to investigate the ZA/SiO 2 adsorption of Cu(II) and Cr(VI) solution treatment effect. The sorption kinetics curves of Cu(II) and Cr(VI) on ZA/SiO 2 were L-shaped. What’s more, the solid concentration effect was found in the process of sorption kinetics. Langmuir and Freundlich sorption isotherm models were used to analyze the adsorption data. The results showed that the adsorption conforms to Langmuir and Freundlich adsorption isotherm models. However, the adsorption capacity of ZA/SiO 2 compounds for Cu(II) and Cr(VI) is greatly improved. The adsorption capacity of Cu(II) is 158 mg·g −1 and of Cr(VI) is 176 mg·g −1 , which were 3.6 and 1.8 times of ZnAl-LDHs (ZA), respectively. Density functional theory (DFT) was utilized for the analysis of intrinsic mechanism and specific pathways. The primary mechanism for removing Cr(VI) from water mainly included the intercalation of Cr 2 O 7 2− and exchange between Cr 2 O 7 2− and OH − , excluding Cr(OH) 3 precipitation. Regarding the primary mechanism for eliminating Cu(II) from water, it involves isomorphic substitution as the predominant process, except for the formation of Cu(OH) 2 precipitates.
研究领域:
环境科学
·
材料科学
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DOI
PubMed
高影响因子
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