JOURNAL OF NANOSCIENCE AND NANOTECHNOLOGY
·
2017
·Vol. 17
·期 6
·3744-3750
·
IF 1.483
Yang Guangming,Yu Hongbo,Zhang Jianfeng,Yin Hongfeng,Ma Zhen,Zhou Shenghu
AuPd nanoparticles (NPs) protected by tetradecyl trimethyl ammonium bromide (TTAB) were coated with SiO2 through hydrolysis of tetraethylorthosilicate (TEOS). The as-synthesized AuPd@SiO2 core–shell NPs were calcined in air at 500 °C to remove TTAB and
open up mesopores within the SiO2 shells. The obtained Au–PdO@m-SiO2 NPs were reduced by H2 at 300 °C to obtain AuPd@m-SiO2 NPs with AuPd NP cores (diameter: ~3 nm) and SiO2 shells (thickness: ~18 nm). Results from relevant characterization
indicated that these SiO2-protected core–shell NPs were highly stable during calcination and subsequent reduction. Au@m-SiO2, Au10Pd@m-SiO2, Au5Pd@m-SiO2, AuPd5@m-SiO2, AuPd10@m-SiO2,
and Pd@m-SiO2 NPs with similar core sizes and shell thicknesses were also synthesized. These samples were tested in the catalytic hydrogenation of p-chloronitrobenzene. The activity and selectivity were found to be tunable, depending on the composition of the bimetallic alloys.
AuPd@m-SiO2 NPs with a 1/1 molar ratio of Au/Pd showed the highest selectivity for the hydrodechlorination of p-chloronitrobenzene.
研究领域:
材料科学
·
催化
·
化学工程
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
DESALINATION
·
2024
·
IF 8.3
Wenting Li,Mengdi Chen,Ganwei Zhang,Weicai Chen,Lei Zhang,Shusu Shen,Dapeng Liu,Xiaoji Zhou,Yaoliang Hong
The DCMD technology for wastewater treatment is very promising. However, it is easily suffered by membrane fouling and wetting. In this study, a Janus membrane was fabricated by coating polyvinylamine (PVAM) and gallic acid (GA) onto one side of a PVDF composite membrane, which another side is covered with POTS-SiO 2 . The PVAM and GA side could bind water to form a hydration layer, thus repel the contaminants. The POTS-SiO 2 side was superhydrophobicity and prevented the membrane wetting. Finally, The Janus membrane presented exceptional performance in separating salt containing emulsified oil by DCMD. It kept a stable flux of 17.0 ± 0.2 Kg·m −2 ·h −1 and a low level conductivity of 0.60 ± 0.02 μS/cm in the cold side during the 36 h DCMD procedure, compared with the pristine PVDF membrane and the PVDF/POTS-SiO 2 membrane. The results presented simultaneously antifouling and antiwetting properties of the Janus membrane. While the Janus membrane can be well used in desalination of emulsified oil containing salt, it has a great potential for application to treat other complex wastewater.
研究领域:
环境工程
·
膜科学
·
水处理
✓ 已验证
产品关联
DOI
高影响因子
ACS Sensors
·
2020
·
IF 7.333
Xing Lu,Guobao Zhou,Jian Zhang,Wei Xie,Yiwen Yang,Yanbo Zeng,Zulei Zhang,Hailong Wang,Lei Li
A novel SiO2@ MIPIL fluorescence sensor for the highly sensitive detection of 2,4,6-trichlorophenol was prepared by using surface molecularly imprinting technology with SiO2 microspheres as carriers and 3,3′-(anthracene-9,10-diylbis(methylene))bis(1-vinyl-1H-imidazole-3-ium) chloride as a double recognition fluorescence functional monomer. The prepared molecularly imprinted polymer (SiO2@MIPIL) was characterized by Fourier transform infrared spectroscopy, scanning electron microscopy, transmission electron microscopy, laser confocal microscopy, and nuclear magnetic resonance. Compared with the polymer obtained via bulk polymerization (MIPIL), the surface molecularly imprinted polymer (SiO2@MIPIL) has a better linear range (0.1–50 nM), lower detection limit (89 pM), and shorter detection time (approximately 1.5 min). The fluorescence sensor also shows good specificity, high sensitivity, good stability, and reusability. Satisfactory results were obtained when using this sensor in industrial wastewater and spiked environmental water.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Pu Mao,Qinzhao Sun,Lixue Zhang,Zepeng Wang,Liqiang He,Ruirui Kang,Gang Lu,Bing Xie,Zhiyong Liu,Jiping Wang
The development of excellent performances polymer-based nanocomposite films with high discharge energy density and high discharge efficiency are eagerly desirable for promoting their electric energy storage applications. However, the high discharge energy density and efficiency of polymer-based nanocomposite films are usually not compatible above intermediate electric fields. To address this issue, here we propose a newly designed multilayer-structured nanocomposite film with a combination of introducing the BaTiO 3 /CaCu 3 Ti 4 O 12 @SiO 2 (BT/CCTO@SO) hybrid nanoparticles with core–shell structure in middle layer and the poly(methyl methacrylate) (PMMA) linear polymer with low loss in outer layers. These motivations of introducing the core–shell structured hybrid nanoparticles with high dielectric constant and designing the multilayered structure give rise to an enhancement of maximum electric displacement while maintaining a relatively high breakdown strength. Also importantly, bring the PMMA polymer into top and bottom layers results in the low energy loss of whole nanocomposite film. Benefiting from these merits, a larger maximum electric displacement of 11.7 μC/cm 2 and a higher discharge energy density of 18.84 J/cm 3 accompanied with an ultrahigh discharge efficiency of 79.81% under an intermediate electric field of 418.13 MV/m are achieved in multilayer-structured nanocomposite film even at a very low filler loading of 2 wt% BT/CCTO@SO hybrid nanoparticles in middle layer, and these enhanced values are far higher than that of the monolayer nanocomposite films. This work validates the advantages of multilayered structure to integrate multiple components and presents outstanding overall performances of nanocomposite films in further applications of the dielectric capacitors with miniaturization and integration.
研究领域:
材料科学
·
能源存储
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING SCIENCE
·
2024
·
IF 4.1
Qi Li,Senlin Deng,Junyang Liu,Tingting Yan,Jinguo Hao,Gang Wang,Guoliang Zhang,Jie Li,Chunshan Li
The dispersion of active sites plays an imperative role in the promotion of catalytic performance on methyl acrylate synthesis via direct vaporous aldol condensation. Herein, a novel PEG-assisted impregnation method was proposed to synthesize Cs/Zr-SiO 2 catalyst with high dispersion of acid and base sites. A series of characterization techniques including NMR, TEM, physical N 2 adsorption isotherms, XRD, XPS, NH 3 -/CO 2 -TPD, and Py-IR were used to investigate the physico-chemical properties of these prepared catalyst series. The introduction of PEG improved the specific surface area, dispersion of active sites, and density of acid and base sites, resulting in superior catalytic performance of Cs/PEG@Zr-SiO 2 by comparison with that of Cs/SiO 2 and Cs/Zr-SiO 2 . The kinetic experiments revealed that the activation energy of aldol condensation was 80.8 kJ/mol over the Cs/PEG@Zr-SiO 2 catalyst. The deactivation behavior derived from carbon deposition was discovered, and the spent catalyst could be regenerated by simple thermal treatment.
研究领域:
催化化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
TRIBOLOGY INTERNATIONAL
·
2025
·
IF 6.9
Baihong Yu,Yan Shen,Leize Li,Junjing Fan,Jinghao Qu,Jiujun Xu
SiO 2 nanoparticles bonded sorbitan monostearate oleogel (SiO 2 -SMS gel) was prepared by water bath heating. The green oleogel additive in the mineral base oil reduced both the friction coefficient and the wear depth by over 50 % for the DLC and cast iron tribopairs. It achieved an ultra-low friction coefficient of 0.0411. The excellent tribological properties are attributed to the formation of a 300 nm bilayer tribofilm on the cast iron surface. The tribofilm effectively prevents plastic deformation and abrasive wear of the tribopairs. Hydroxyl bonding in the SMS molecules and the embedding of SiO 2 NPs ensure strong adhesion of the tribofilm to the substrate. The findings offer valuable insights for the development of high-performance lubricant additives.
研究领域:
材料科学
·
机械工程
·
纳米技术
·
化学工程
·
摩擦学
✓ 已验证
产品关联
DOI
高影响因子
International Journal of Nanoscience
·
2023
·
IF 0.8
Jie Yang,Jun Li,Zhantao Wei,Tao Wang,Hang Jiang,Likang Xiao,Jianghe Lan,Jiayi Zhu,Xiaoru Liu,Gang Xu,Zhipeng Gao,Zhengwei Xiong
The graded-refractive-index SiO 2 antireflective (AR) films were prepared using the sol–gel method. A monolayer with a porous nanonetwork structure was designed as the mixed volume ratio of 70:30 between the alkali- and acid-catalyzed SiO 2 sols. As the top layer, the hexamethylisilazane (HMDS) modified alkali catalyzed SiO 2 sols induced SiO 2 nanoparticles transforming from hydrophilic to hydrophobic nature. In comparison with the structures of monolayer and bilayer films, the AR properties and laser damage resistance were investigated in detail. By designing the nanostructures of the bottom and top layers, the graded- refractive-index SiO 2 film was obtained, consequently enhancing the AR performance. In the bilayer film, the transmittance reached ∼ 98%@532 nm and 97%@1064 nm, respectively, corresponding to the obvious reduction of reflectivity. The assembly of the bilayer SiO 2 film increased the laser-induced damage threshold by ∼ 30% from 25.3 J/cm 2 (monolayer) to 33.1 J/cm 2 (bilayer). The inducement of laser damage was further revealed by the analysis of morphological changes induced by laser damage, attributing to the initiator absorption of environmental contaminations. Therefore, the SiO 2 film not only provided a graded-refractive-index structure with good AR performance, but also had high laser damage resistance. The unique graded-refractive-index structure of SiO 2 AR films offers a new strategy for improving the performance of optical components in high-power laser systems.
研究领域:
光学材料
·
薄膜技术
·
光子学
·
应用物理
·
材料科学
✓ 已验证
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2025
·
IF 5.1
Chenyu Cai,Shuangshuang Liang,Tianxiang Li,Luyao Cong,An Fan,Hong Hao
Intelligently responsive super-wetting coatings have garnered significant attention for their ability to modulate wettability in response to environmental stimuli, enabling efficient oil/water separation. This study presents a novel pH-responsive super-wetting coating fabricated via a simple, cost-effective sol-gel and dip-coating approach on cotton fabric. The coating combines low-surface-energy dodecyl trimethoxysilane (DTMS) with pH-sensitive 3-aminopropyl triethoxysilane (KH550) modified SiO 2 nanoparticles. The coating's structure, morphology, and properties were characterized using Fourier transform infrared (FTIR), scanning electron microscopy (SEM), thermogravimetric analysis (TGA), X-ray photoelectron spectroscopy (XPS), and water contact angle measurements (WCA). Compared to existing pH-responsive systems, this coating exhibits superior switching speed: it transitions rapidly from superhydrophobicity (WCA > 150° at pH 7) to superhydrophilicity (WCA decreases from 50.24° to 0° within 20 s at pH 1) and reversibly back to superhydrophobicity (WCA = 163° at pH 13). The coating demonstrates excellent stability in various salt solutions (NaCl, KCl, KNO 3 ) and under ultrasonic washing, ensuring robustness in complex aqueous environments. Leveraging this reversible wettability switching, the coating achieves high separation efficiencies for both high-density (98.5 %) and low-density (96 %) oil/water mixtures. Critically, this fabrication strategy eliminates the need for expensive, environmentally hazardous heavy metals (e.g., Ag, Au, Cu) or complex polymerization processes commonly employed in other smart separation materials. The combination of rapid switching, environmental and economic friendliness, salt resistance, durability, and high separation performance underscores the significant potential of this coating for diverse practical oil/water separation applications.
研究领域:
材料科学
·
表面化学
·
环境功能材料
·
纳米技术
·
分离科学
✓ 已验证
产品关联
DOI
高影响因子
LANGMUIR
·
2019
·
IF 3.683
Meiling Chen,Rui Xiong,Xin Cui,Qi Wang,Xiaowang Liu
The development of earth-abundant catalysts for efficient hydrolysis of ammonia borane is of great importance in the conversion and utilization of hydrogen energy. Here, we report the synthesis of SiO2-encompassed Co@N-doped porous carbon assemblies as a new type of recyclable catalyst for the purpose by calcination of zeolitic imidazolate framework-67@SiO2 microtubes at high temperatures under an N2 atmosphere. We find that the surface layer of SiO2 in the precursor microtubes is essential for the production of efficient catalysts by supplying an additional surface for Co nanoparticle dispersion in an effort to reduce their size. In addition, the SiO2 layer renders a highly ordered arrangement of Co@N-doped porous carbon within the catalysts, possibly allowing the ease of mass transfer of ammonia borane within the catalysts. The optimized catalysts obtained via calcination at 800 °C show a set of remarkable catalytic benefits, including a high hydrogen generation rate of 8.4 mol min–1 mol(Co)–1, a relatively low activation energy of 36.1 kJ mol–1, and a remarkable reusability (at least 10 times). Our results can provide new insight into the design and synthesis of highly ordered SiO2-supported catalysts for different reactions.
研究领域:
材料科学
·
催化
·
氢能
·
化学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of the Mechanical Behavior of Biomedical Materials
·
2018
·
IF 3.239
Xue Liu,Zengyao Wang,Chengji Zhao,Wenhuan Bu,Hui Na
A series of fluorinated dental resin composites were prepared with two kinds of SiO 2 particles. Bis-GMA (bisphenol A-glycerolate dimethacrylate)/4-TF-PQEA (fluorinated acrylate monomer)/TEGDMA (triethylene glycol dimethacrylate) (40/30/30, wt/wt/wt) was introduced as resin matrix . SiO 2 nanopartices (30 nm) and SiO 2 microparticles (0.3 µm) were silanized with 3-methacryloxypropyl trimethoxysilane (γ-MPS) and used as fillers. After mixing the resin matrix with 0%, 10%, 20%, 30% SiO 2 nanopartices and 0%, 10%, 20%, 30%, 40%, 50% SiO 2 microparticles, respectively, the fluorinated resin composites were obtained. Properties including double bond conversion (DC), polymerization shrinkage (PS), water sorption (W p ), water solubility (W y ), mechanical properties and cytotoxicity were investigated in comparison with those of neat resin system. The results showed that, filler particles could improve the overall performance of resin composites, particularly in improving mechanical properties and reducing PS of composites along with the addition of filler loading. Compared to resin composites containing SiO 2 microparticles, SiO 2 nanoparticles resin composites had higher DC, higher mechanical properties, lower PS and lower W p under the same filler content . Especially, 50% SiO 2 microparticles reinforced resins exhibited the best flexural strength (104.04 ± 7.40 MPa), flexural modulus (5.62 ± 0.16 GPa), vickers microhardness (37.34 ± 1.13 HV), compressive strength (301.54 ± 5.66 MPa) and the lowest polymerization (3.42 ± 0.22%).
研究领域:
材料科学
·
牙科材料
·
高分子化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ENERGY
·
2024
·
IF 9
Bingshuo Li,Aorong Ding,Tianhua Yang,Zhuo Wang,Haijun Zhang,Xingping Kai,Rundong Li
Hydrodeoxygenation (HDO) of phenols has significant potential for the synthesis of cycloalkane. In this study, a Ni-based magnetic molecular sieve catalyst, Ni/HZSM-5@SiO 2 @Fe 3 O 4 , was carefully prepared and systematically characterized using various analytical methods. A screening of the HDO reaction conditions was carried out using a typical phenolic compound of 4-ethylphenol. Under the optimal reaction conditions (240 °C, 3 h) with n-dodecane as the solvent, the 6 % Ni/HZSM-5@SiO 2 @Fe 3 O 4 catalyst showed excellent performance, achieving a 4-ethylphenol conversion of 59.3 % and an ethylcyclohexane selectivity of 85.1 %. In comparison to conventional Ni/HZSM-5, the magnetic micromesoporous molecular sieve catalyst exhibited superior catalytic activity, alkane selectivity and recyclability, with a catalyst recovery ratio of 95 %. Furthermore, the effect of liquid-solid mass transfer efficiency on the ethylcyclohexane selectivity considering of the stirring speed was studied, and the selectivity was increased from 81.6 to 85.1 % when the speed was increased from 400 to 600 rpm. This finding was further substantiated by Fluent numerical simulation. To elucidate the HDO pathway of 4-ethylphenol on Ni/HZSM-5@SiO 2 @Fe 3 O 4 , a comprehensive reaction pathway was proposed, providing insights into the catalytic mechanism.
研究领域:
催化化学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
MATERIALS & DESIGN
·
2018
·
IF 4.525
Jiaheng Wang,Siu Wing Or,Jun Tan
Core/shell/shell-structured Ni/SiO 2 /polyaniline hexagonal nanoflakes possessing in-plane [111] easy magnetization ( M ) and out-of-plane interfacial polarization ( P ) are synthesized by a three-step liquid chemical method , and their physicochemical properties and growth mechanism are investigated. Three characteristic types of paraffin-bonded ring-shaped nanoflake composites having random (R), vertical–horizontal (V–H), and horizontal–vertical (H–V) orientations of the orthogonal M and P to their two major surfaces are prepared by randomly, vertically, and horizontally aligning the nanoflakes in the paraffin matrix under a magnetic alignment and thermal curing process . The composites are evaluated experimentally and theoretically in the L–Ku (1–18 GHz) bands of microwaves in order to investigate the orientation effect of the orthogonal M and P on their microwave electromagnetic properties . The in-plane M in the H–V-oriented composite and the out-of-plane P in the V–H-oriented composite, which are parallel to the effective magnetic and electric field vectors of incident microwaves, result in a significant enhancement in permeability with multiple magnetic natural resonances and an obvious improvement in permittivity in comparison with other composites, respectively. The observations agree with the theoretical predictions based on the Landau–Lifshitz–Gilbert equation and Bruggeman's effective medium theory for permeability and the Debye's polarization theory for permittivity. As a result, the H–V-oriented composite achieves the best microwave electromagnetic impedance matching and absorption with a broad absorbing bandwidth of 4 GHz, a wide thickness range of 7–10 mm, and a minimal reflection loss of −41.5 dB in the Ku (12–18 GHz) band.
研究领域:
材料科学
·
电磁学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）