ChemistrySelect
·
2023
·Vol. 8
·期 31
·e202300799
·
IF 2.1
Lin-Jie He,Yao-Feng Wang,Peng-Xin Guan,Qing-Shan Niu,Hong-Ying Liu,Bao-Hua Xu
The vapor-phase nitrilation of dimethyl adipate (DMA) with ammonia (NH 3 ) is an environmentally benign route leading to adiponitrile (ADN) with great application value. In this study, the performance of HZSM-5 zeolites, widely used in industry as the solid acid catalysts, was investigated. It exhibits a strong correlation between the SiO 2 /Al 2 O 3 ratio (SAR) in HZSM-5 zeolites and the reactivity (both activity and selectivity). The influence of Al density closely related to the value of SAR on the reactivity of HZSM-5 was thus elucidated by mechanistic experiments. As a result, the introduction of Al element to the framework is beneficial to the activation of ester functionality, thus improving the activity, especially at a high liquid hourly space velocity (LHSV). However, a high Al density will lead to poor selectivity and deactivation due to too strong adsorption of esters and intermediates (e. g., amides). Herein, the balanced adsorption/desorption capability was reached on HZSM-5 with SAR as 631 (i. e., HZSM-5-631), which provides the best selectivity to nitriles (S ADN+MCP , 92.5 %) at a high single-pass conversion of DMA (C DMA , 98.0 %). Graphical The nitrilation of DMA over HZSM-5 with different SiO 2 /Al 2 O 3 was investigated, wherein HZSM-5 with SiO 2 /Al 2 O 3 of 631 exhibited excellent reactivity due to the balance of ester activation and amide intermediate desorption.
研究领域:
催化化学
·
化学工程
·
绿色化学
·
材料科学
·
有机合成
✓ 已验证
DOI
高影响因子
METALLURGICAL AND MATERIALS TRANSACTIONS B-PROCESS METALLURGY AND MATERIALS PROCESSING SCIENCE
·
2026
·
IF 3.1
An Zhuoqing,Liang Weiwen,Gao Yuan,Chen Jiajing
The viscosity of the CaO–MgO–Al 2 O 3 –SiO 2 system containing La 2 O 3 and Fe 2 O 3 was measured by rotation, hot-stage microscopy and hot-stage load methods to investigate the rheological behavior across multiple temperature ranges. In-situ high temperature Raman spectroscopy was employed to quantitatively analyze the microstructure. The results show that with the La 2 O 3 /Fe 2 O 3 ratio varying from 2/0 to 0/2, the viscosity decreases gradually through the multiple temperature ranges, and the viscous flow activation energy also gradually decreases. As the ratio of La 2 O 3 /Fe 2 O 3 decreases, the relative contents of Q 0 , Q 1 and Q 2 increase gradually, and the relative contents of Q 3 and Q 4 decrease significantly. This indicates that both La 2 O 3 and Fe 2 O 3 act as network modifiers and simplify the glass network structure, resulting in a decrease in the degree of network polymerization and viscosity over the multiple temperature range. Compared to La 2 O 3 , Fe 2 O 3 is a more effective network modifier, as it breaks up the silicate network more efficiently and results in a lower overall viscosity. In addition, the microstructure of the melts was quantitatively analyzed by NBO/ T , and a quantified relationship among viscosity, microstructure and temperature was given.
✓ 已验证
产品关联
DOI
高影响因子
Desalination and Water Treatment
·
2024
·
IF 1
Jun Yin,Xinan Cai,Bingshan Wang
In order to reduce silica nanoparticles (SiO 2 NPs) agglomeration, improve the dispersity of SiO 2 NPs in the matrix of polyethersulfone (PES) composite membrane, the poly (acrylic acid) grafted SiO 2 NPs (SiO 2 -g-PAA NPs) are beforehand synthesized via surface-initiated activators regenerated by electron transfer atom transfer radical polymerization (ARGET ATRP). PES/SiO 2 -g-PAA organic-inorganic composite membranes are convenient fabricated by blending PES matrix with the as-synthesized SiO 2 -g-PAA NPs via the non-solvent induced phase separation (NIPS) process. The attenuated total reflectance Fourier-transform infrared spectroscopy and surface scanning electron microscope (SEM) results confirm that the well dispersed SiO 2 -g-PAA NPs tend to migrate toward the membrane top surfaces. As a result, the composite membrane exhibited the highest pure water flux and oil flux around 233.72 and 97.29 L/m 2 h, which equal to 3.6 times and 8.8 times of unmodified PES membrane respectively. The flux recovery rate increased from 45.74% to 77.12%, suggesting the fouling-resistance of the composite membranes was greatly improved. Furthermore, the SiO 2 -g-PAA NPs exhibit excellent stability in the membrane matrix benefit from the interaction between PAA polymer chains and PES. In addition, the reactive PAA chains on the membrane surface provide a platform for further functionalization.
研究领域:
材料科学
·
膜技术
·
环境工程
·
高分子化学
·
纳米复合材料
✓ 已验证
DOI
高影响因子
Nanoscale
·
2019
·Vol. 11
·期 31
·14844-14856
·
IF 6.97
Haoru Shan,Xiangyang Dong,Xiaota Cheng,Yang Si,Jianyong Yu,Bin Ding
The development of inorganic membranous catalysts with both large mesopores and superb flexibility is extremely favorable for the enhancement of their catalytic oxidation activity for the degradation of antibiotic pollutants in wastewater via sulfate radical-based advanced oxidation processes; however, there still exists a huge challenge for inorganic materials to simultaneously realize these two properties. Herein, metallic copper-doped carbon/silica nanofibrous membranes (Cu@C/SiO2 NFMs) with large mesopores, superb flexibility, and robust mechanical strength were fabricated through a sol–gel electrospinning and subsequent in situ carbonization reduction method. The synthesized Cu nanoparticles were homogeneously distributed throughout the mesoporous C/SiO2 nanofiber matrix, which enabled the resultant Cu@C/SiO2 NFMs to be applied as heterogeneous catalysts, and their catalytic performance was systematically assessed through activating persulfate for the elimination of tetracycline hydrochloride (TCH) in water. The fabricated Cu@C/SiO2 NFMs provided outstanding catalytic performance towards TCH with a high removal efficiency of 95% in 40 min and a rapid removal speed of 0.054 min−1. Moreover, the membranes could be facilely recycled through being directly separated from water without any post-processing. Such a facile strategy for preparing mesoporous and flexible metal-doped inorganic nanofibrous membranes may offer novel insights for designing new types of heterogeneous catalysts for antibiotic-containing wastewater treatment or other potential applications.
研究领域:
环境科学
·
材料科学
·
化学工程
·
纳米技术
·
水处理
✓ 已验证
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2026
·
IF 6.6
Zhijiao Pan,Weiqiang Yu,Qiaohong Zhang,Zhenyun Wang,Zhongquan Zhang,Yingyi Lu,Jin Gao,Chen Chen
Dual-alkylamino-doped silica AP-SiO 2 -DEAP was synthesized with a higher content. • Surface charge property of AP-SiO 2 -DEAP can be flexibly switched with wetting. • Efficient removal of cationic or anionic pollutant species with one adsorbent. Electrostatic attraction is one of the main interactions during the adsorption. Seldom an adsorbent can simultaneously remove the cationic and anionic pollutant due to owning a single surface charge property. In this manuscript, a two-alkylamino-doped silica material AP-SiO 2 -DEAP was synthesized with one-step condensation method. Due to the protonation of a higher content of alkylamino groups in water, the surface of this material initially presented to be very positively-charged (+31.3 mV), which showed excellent adsorption performance for the recently emerging anionic pollutant of perfluoroalkylated substances (PFASs) such as sodium p -perfluorous nonenoxybenzene sulfonate (OBS) with a maximum adsorption capacity of 2821 mg g −1 . Being prewetted in water, however, the surface of this material could be switched to be more negatively-charged (−33.9 mV) due to the generation of large amounts of Si-O − accompanying the generation of obvious mesoporous structure. The obtained material turned to be more efficient for the adsorption of the cationic pollutant such as the heavy metal ion Pb 2+ with a maximum adsorption capacity of 712 mg g −1 . More attractively, synergetic adsorption was obtained for the simultaneous adsorption of anionic OBS and cationic Pb 2+ . The removal efficiency for OBS and Pb 2+ both reached above 99% for the complex wastewater. Download: Download high-res image (259KB) Download: Download full-size image
✓ 已验证
DOI
高影响因子
NANO
·
2026
·
IF 1.3
Weifeng Chen,Dandan Han,Zhiwei Huang,Xuan Tian,Ting Xiao,Yizhu Lei
Ice accretion severely compromises infrastructure safety and efficiency. While integrating photothermal function with superhydrophobicity offers a promising solution, achieving this synergy within a mechanically robust coating remains challenging. Herein, we present a superhydrophobic nanocomposite coating fabricated by embedding multi-walled carbon nanotubes (MWCNTs) and hydrophobic silica (H-SiO 2 ) in an organosilicon polymer (OSP) matrix. The OSP/MWCNT/H-SiO 2 coating exhibits good mechanical durability, maintaining superhydrophobicity after severe water and sand impact, owing to the reinforced composite structure. Crucially, the design yields a remarkable photothermal conversion efficiency, achieving a temperature rise of 85 °C under 1.0 kW·m −2 irradiation. This photothermalsuperhydrophobic synergy enables outstanding anti-icing performance, delaying ice formation for over 578 s at -20 °C, and efficient solar-driven de-icing (complete melting within 462 s). Successfully demonstrated on insulators, our coating offers a viable dualfunctional platform to address icing challenges in practical settings.
✓ 已验证
DOI
高影响因子
LANGMUIR
·
2026
·
IF 4.4
Jiang Jie,Yang Ling,Jiang Tian,Ma Zhenye
Ultrafine ammonium perchlorate (UF-AP) is prone to hygroscopic
agglomeration, which severely affects the loading uniformity and combustion
stability of solid propellants. In this study, hydrophobic modification
of nano-silica was conducted using 1H,1H,2H,2H-perfluorooctyltriethoxysilane
(PFOTES). SiO 2 –PFOTES particles with different modifier
loadings were prepared and then coated onto the surface of UF-AP via
a wet coating process to obtain UF-AP/SiO 2 –PFOTES
composite particles. The microstructure, thermal decomposition behavior,
surface wettability, storage stability, and mechanical sensitivity
of the composite particles were characterized by SEM, EDS, FTIR, XRD,
TG-DSC, contact angle measurement, and hygroscopicity tests. The results
show that PFOTES is successfully grafted onto the SiO 2 surface.
When the modifier loading is 4%, the SiO 2 –PFOTES
particles exhibit superhydrophobicity (water contact angle >150 ° ).
At a coating content of 5%, SiO 2 –PFOTES forms a
well-distributed coating layer on the UF-AP surface, as evidenced
by SEM, TG, and surface wettability analyses. Consequently, the water
contact angle of the composite particles increases from 0 ° to
79.7 ° , the moisture absorption rate decreases from 0.26% to 0.08%
(a reduction of 69.23%), and the surface energy decreases from 78.72
J/m 2 to 31.39 J/m 2 . Moreover, the composite
particles maintained good dispersibility after storage in a laboratory
environment for 30 days. Thermal decomposition tests revealed that
the low-temperature and high-temperature decomposition peaks of UF-AP
merged into a single exothermic peak after coating, with the total
heat release increasing from 319.3 J/g to 380.5 J/g (an apparent increase
of 18.65% based on composite mass, corresponding to a 25.4% increase
when normalized to per gram of AP). Mechanical sensitivity tests showed
that the coating did not introduce additional safety hazards under
the tested conditions. This study provides an effective strategy for
anti-hygroscopic modification of UF-AP, showing good application prospects
in the field of solid propellants.
✓ 已验证
DOI
高影响因子
MICROCHIMICA ACTA
·
2022
·Vol. 189
·期 9
·1-11
·
IF 6.408
Zhai Hongguo,Wang Yue,Yin Jiaqi,Zhang Yuhao,Guo Qi,Sun Xia,Guo Yemin,Yang Qingqing,Li Falan,Zhang Yanyan
MXene@Au as the base and Au@SiO 2 as signal amplification factor were used for constructing an ultrasensitive “on–off” electrochemiluminescence (ECL) biosensor for the detection of Pb 2+ in water. The use of MXene@Au composite provided a good interface environment for the loading of tris(2,2-bipyridyl)ruthenium(II) (Ru(bpy) 3 2+ ) on the electrode. Based on resonance energy transfer, the Au (core) SiO 2 (shell) (Au@SiO 2 ) nanoparticles stimulate electron transport and promote tripropylamine (TPrA) oxidation. The luminescence effect of Au@SiO 2 was five times that of AuNPs and SiO 2 nanomaterials alone, and the ECL intensity was greatly improved. In addition, Pb 2+ activated the aptamer to exert its endonuclease activity, which realized the signal cycle amplification in the process of Pb 2+ detection. When Pb 2+ was added, the ECL signal weakened, and the Pb 2+ concentration was detected according to the decreased ECL intensity. Under optimized experimental conditions, this aptamer sensor for Pb 2+ has a wide detection range (0.1 to 1 × 10 6 ng L −1 ) and a low detection limit (0.059 ng L −1 ). The relative standard deviation (RSD) of the sensor is 0.39–0.99%, and the recovery of spiked standard is between 90.00 and 125.70%. The sensor shows good selectivity and high sensitivity in actual water sample analysis. This signal amplification strategy possibly provides a new method for the detection of other heavy metal ions and small molecules. Graphical abstract
研究领域:
分析化学
·
环境科学
·
材料科学
·
生物化学
✓ 已验证
DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2022
·
IF 7.392
Taiguang Li,Mingyong Wang,Qingzheng Hou,Yaqi Hou,Kai Xuan,Yongmei Hao
One kind of novel magnetically separable graphene-based titanium dioxide photocatalytic nano-adsorbents (GO-FSNTs) were prepared for the adsorption-photodegradation of phenanthrene under visible light. The GO-FSNTs displayed the high adsorption-photodegradation efficiency and 10 mg of 0.6% GO-FSNT (wt%) can remove 94.9% of phenanthrene within 4 h. The introduction of a small amount of GO enables 0.6% GO-FSNT to selectively adsorb phenanthrene through the π-π interaction, reduce the light-shielding effect and improve separation of photogenerated carriers effectively. Meanwhile, the N-TiO 2 shell is occupied by adsorbed water molecules which can spontaneously repair lattice oxygen. Furthermore, the more hydrophilic surface of 0.6% GO-FSNT is formed by increased photoinduced hydroxyl groups under visible light during photodegradation. The photoinduced hydroxyl groups can further generate OH and improve photocatalytic activity. The degradation pathway of phenanthrene was proposed based on intermediates analysis and density functional theory calculations. This work helps to reveal the relationship between the adsorption-photodegradation and the photoinduced hydrophilicity.
研究领域:
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Materials Today Chemistry
·
2023
·
IF 7.3
M. Lu,Q. Liu,Z. Wang,X. Zhang,G. Luo,J. Lu,D. Zeng,X. Zhao,S. Tian
An antireflection (AR) film on the surface of the photovoltaic glass can significantly improve the photoelectric conversion efficiency of solar cells. However, AR films prepared by a facile and low-cost sol-gel method usually exhibit poor mechanical properties , which limits their applications. Herein, hexamethoxy methyl melamine resin (CYMEL 303LF) was employed as a pore-forming agent in the sol and sacrificial template to prepare porous SiO 2 film on glass by a facile sol-gel method and subsequent heat treatment. The obtained SiO 2 film showed a high solar transmittance increase of 3.24% in the wavelength range of 380–1100 nm and a good hardness of H when the dosage of CYMEL 303LF is 10 wt%, the short circuit current density and photoelectric conversion efficiency of the solar cell are increased respectively by 1.44 mA/cm 2 and 1.08%, compared with the substrate, which is better than most SiO 2 films in the previous works. With increasing the dosage of CYMEL 303LF from 0% to 12%, the solar transmittance gain was increased at first and then decreased, while the film hardness was decreased straightly. This was probably because that the introduction of CYMEL 303LF can facilitate the formation of more pores in the SiO 2 film, leading to a decrease in the refractive index and film adhesion. Therefore, this work can provide a facile method to prepare high-performance SiO 2 as AR film for solar cells.
研究领域:
材料科学
·
能源科学
✓ 已验证
DOI
高影响因子
APPLIED THERMAL ENGINEERING
·
2025
·
IF 6.9
Fei Liang,Shaobo Xi,Jing Ding,Jianfeng Lu,Duu-Jong Lee,Shule Liu
The Gen 3 concentrating solar power (CSP) system, featuring a high-temperature molten chloride salt reheating device, can continuously generate electricity with high efficiency. Adding nanoparticles to molten salts can improve the suspension’s thermal conductivity and heat capacity. However, nanoparticle agglomeration can impair heat transfer and storage performance, potentially leading to device failure. This study employed molecular dynamics (MD) simulations with machine learning (ML) potentials to explore the enhancement mechanism of SiO 2 nanoparticles on the thermal properties of a molten LiCl-KCl eutectic. Specific heat capacity and suspension density were monitored and compared with experiments, considering molten salt temperature, nanoparticle sizes, and loadings as control variables. Adding 13–28 Å SiO 2 at 1–6% w/w increased the specific heat capacity of the molten eutectic. Interfacial adsorption of molten salt ions onto the nanoparticles created a unique microstructure, preventing particle agglomeration and enhancing inter-particle heat transport rates. While the specific surface area of nanoparticles is a primary factor in determining thermal performance, its impact diminishes with smaller nanoparticles due to agglomeration. Detailed comparisons of ion distributions around the nanoparticles revealed that strong interfacial adsorption of Li + primarily regulates the electrical field near the interface, leading to excess surface adsorption and increased heat capacity. The molecular configurations for LiCl-KCl nanofluids were detailed and presented for the first time to suggest practical ways to enhance their heat storage performance. Strategies to minimize particle agglomeration in the molten LiCl-KCl eutectic are discussed based on the study’s conclusions.
研究领域:
材料科学
·
热工工程
·
可再生能源
·
计算化学
·
纳米技术
✓ 已验证
产品关联
DOI
高影响因子
INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
·
2017
·
IF 3.671
Xinyu Hu,Yongmei Wang,Liangliang Zhang,Man Xu,Jianfa Zhang,Wei Dong
Salecan, a novel water-soluble extracellular β-glucan, is very suitable for the hydrogel preparation. Here, pH-sensitive magnetic composite hydrogel was fabricated by the graft copolymerization of crotonic acid (CA) and N-(hydroxymethyl) acrylamide (HMAA) onto salecan in the presence of Fe 3 O 4 @SiO 2 nanoparticles for doxorubicin (DOX) delivery. The embedment of Fe 3 O 4 @SiO 2 nanoparticles into salecan-g-poly(CA-co-HMAA) hydrogel network endowed the material with magnetic property. In addition, DOX not only achieved effectively bound to the composite hydrogel, but also released in a controlled and pH-dependent manner. The application of an external magnetic field could significantly enhance the drug release rate. More importantly, the released DOX preserved its bioavailability. Taken together, these hydrogel drug carriers provide a promising platform for magnetically targeted drug delivery.
研究领域:
材料科学
·
药学
·
纳米技术
·
生物医学工程
✓ 已验证
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）