INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION
·
2025
·
IF 1.6
Junxia Chai,Hongbo Mo,Chuan Wang,Fengjie He,Jufen Huang,Li Ran,Weigang Fan,Yuepeng Fan,Fan Lu
This study developed Fe3O4@SiO2–C = C-based magnetic molecularly imprinted polymers for selective ibuprofen removal and detection. The optimized synthesis using an ibuprofen (IBP)/(3-aminopropyl)triethoxysilane (APTES)/tetraethyl orthosilicate (TEOS) molar ratio of 1:6:18 achieved a high adsorption capacity of 68.18 mg·g−1 and an imprinting factor of 2.17. The adsorption process followed pseudo-second-order kinetics and the Freundlich isotherm model, indicating multilayer binding behavior. The material demonstrated excellent reusability with only 2.8% capacity loss after five cycles and good reproducibility with a relative standard deviation of 4.48%. In magnetic solid-phase extraction applications, the recovery rate reached 81.61% to 96.40% for real water samples with a detection limit of 0.09 μg·mL−1. The polymers showed selective recognition of ibuprofen over structural analogs due to synergistic π-π interactions and hydrogen bonding, thus offering an efficient strategy for remediating pharmaceutical pollutants in water.
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DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2025
·
IF 7.7
Jinghua Wang,Zhishen Yin,Jie Sun,Yeqing Liu,Ruoxi Fan,Jialiang Li,Duo Chen,Jia Yan,Shichao Li,Zhanjun Wu
The mechanical properties of resin matrixes are predominant factors influencing the overall performance of fiber-reinforced composites. In this study, the high brittleness and low toughness of epoxy resin (EP) are addressed by incorporating hydroxyl-terminated polyether-sulfone (PES-OH) and nano-silica (Nano-SiO 2 ) into the EP. The incorporation of PES-OH into EP led to a 22.6 % increase in tensile strength and a 27.8 % improvement in elongation at break at ultra-low temperatures. These enhancements are attributed to the formation of a semi-interpenetrating polymer network (SIPN) during the curing process, which strengthens the molecular network of the epoxy resin matrix through physical entanglement, interfacial reinforcement, and stress dispersion, enhancing crack resistance. The simultaneous introduction of PES-OH and Nano-SiO 2 synergistically improves the mechanical properties of EP at ultra-low temperatures (90 K). Specifically, the tensile strength, elongation at break, and modulus of elasticity of the modified EP were increased by 30.63 %, 19.6 %, 20.9 % and a 65.61 % improvement in fracture toughness (K IC ), respectively, compared to the pure EP. The synergistic effect arises from the covalent bonding between the hydroxyl groups on Nano-SiO 2 and those in PES-OH and EP, thereby toughening and strengthening the epoxy molecular structure. Additionally, microdroplet debonding tests of carbon fiber with EP showed a 25.22 % increase in interfacial shear strength after introducing PES-OH and Nano-SiO 2 . Dynamic thermo-mechanical analysis confirmed that the incorporation of PES-OH and Nano-SiO 2 does not compromise the thermal stability of EP.
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高影响因子
Journal of Cleaner Production
·
2022
·
IF 11.072
Yuntai Xi,Fang Dong,Zhongying Ji,Zhicheng Tang,Jiyi Zhang
The shortcomings of Co-based powder catalysts such as amorphous susceptibility to loss and high influence by pressure drop have become the key factors affecting their catalytic activity. In this paper, two methods were proposed to prepare novel monolithic Co 3 O 4 /SiO 2 catalysts by 3D direct ink writing (DIW) technology: (1) one-step method of printing the active component with supports, (2) two-step method of printing the support first, and then loading the active components. The results showed that the monolithic catalyst prepared by the two-step method possessed more abundant Co 3+ and lattice oxygen (O latt ) species than the one-step method, which jointly promoted the catalytic conversion of toluene. However, the catalyst printed by the one-step method had a stronger interaction between the active component and the support, showing better thermal stability and water resistance. In addition, the SiO 2 support (the calcined product after SiO 2 ink printing) enhances the activity, stability, compression resistance, while the N–SiO 2 support (the calcined product after SiO 2 precursor ink printing) can effectively prevent blockage of the pore structure by the binder and increase physical properties such as pore volume and specific surface area of Co 3 O 4 /SiO 2 catalyst.
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高影响因子
JOURNAL OF NUCLEAR MATERIALS
·
2025
·
IF 3.2
Shaobo Yang,Chenxi Liang,Jiali Li,Yujie Ma,Sijie Kou,Juanli Deng,Bo Chen,Shangwu Fan
The study investigated the corrosion behavior and mechanical performance of SiC/SiC composite joints with Y 2 O 3 -Al 2 O 3 -SiO 2 (YAS) interlayers under high-temperature steam environments at 1200 °C. Under low-flow conditions, partial disruption of Si-O and Al-O bonds in the YAS glass network reduced crosslinking, forming an aluminosilicate protective layer that inhibited further corrosion. Prolonged exposure led to Y 3+ migration and accumulation, resulting in Y 2 Si 2 O 7 precipitation and growth. High-flow conditions caused a thinner glass layer, continuous longitudinal cracks, and more severe erosion and dissolution of the YAS glass due to higher steam velocity. Despite these degradations, the joints exhibited satisfactory performance, maintaining shear strengths of about 40 ± 2 MPa after 15 h of low-flow exposure and about 36 ± 5 MPa after 5 h of high-flow exposure. These findings demonstrate that YAS interlayers provide excellent corrosion resistance and mechanical stability as a sealant for nuclear-grade SiC/SiC.
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DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2024
·Vol. 59
·期 32
·15283-15297
·
IF 3.5
Li Dandan,Ye Qibin,Zhao Dong,Li Hui,Chen Chunhai,Qian Guangtao,Yang Jinjun
As the continuous development of aerospace and outer space exploration, high-performance thermal insulation materials with high-temperature resistance and attractive mechanical properties have always been a fascinating topic of research to protect human body or components from extreme environments. In this research, hydrophobic silicon dioxide (SiO 2 ) nanoparticles as molecular skeleton enhancers and heat transfer inhibitors are introduced in crosslinked polyimide (PI) aerogels with rigid molecular structure to maintain the stable nanoporous network structure. The density, shrinkage, porosity, specific surface area and pore size distribution of PI/SiO 2 composite aerogels can be adjusted by the addition of SiO 2 nanoparticles, so as to improve the comprehensive performances. The excellent thermal stability and mechanical properties of PI/SiO 2 composite aerogels with super-high working temperature of over 550 °C and high modulus of compression and tension (compression Young’s modulus of 37.75 MPa and tensile modulus of 237.1 MPa) ensure their use as a structural component. The charming thermal conductivity (29.7 mWm −1 K −1 ) and excellent flame resistance make them a candidate for high-performance thermal insulation materials. Graphical abstract
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DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Yongyuan Deng,Yichao Ye,Tao Yin,Jinyao Mai,Zhipeng Tian,Chao Wang,Ying Chen,Zhi Yang,Junling Tu,Riyang Shu
Hydrodeoxygenation (HDO) technology is an essential method for efficiently converting phenolic compounds from biomass into high-quality liquid fuels. Rationally designed catalysts not only significantly enhance stability and reaction rates, but also improve product selectivity and fuel quality. In this study, we proposed a Zr 3+ -defect-rich core–shell structured catalyst Ru@SiO 2 -ZrO 2 and employed it for the HDO of phenolic compounds and lignin pyrolysis oil. Ru nanoparticles are uniformly dispersed and have small particle sizes, showing outstanding catalytic hydrogenation activity. The porous SiO 2 shell possesses a high specific surface area with a high thermal stability, facilitating reactant transport and maintaining catalyst structural integrity. ZrO 2 serves as an acid modifier to enhance the catalyst acidity and promote the deoxygenation procedure. Besides, ZrO 2 enhances the adsorption of phenolic compounds and improves the cleavage of C-O bonds, due to its abundant oxygen vacancies . These factors make the catalyst achieved complete conversion of guaiacol to cyclohexane at mild reaction temperature of 240°C, which is superior to other similar reported results. Compared to conventional supported Ru/SiO 2 -ZrO 2 catalysts, the unique core–shell structure of Ru@SiO 2 -ZrO 2 obtained a sustained catalytic activity after five consecutive recycles without significant deactivation. Moreover, this core–shell catalyst exhibited good HDO performance for various phenolic compounds and lignin pyrolysis oil. The hydrocarbon content increased significantly from 12.7 % to 96.9 % in the upgrading of lignin pyrolysis oil, demonstrating the catalyst’s great potential for future industrial applications.
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高影响因子
COMPOSITES SCIENCE AND TECHNOLOGY
·
2022
·
IF 9.879
Muhammad Awais,Xiangrong Chen,Zelin Hong,Qilong Wang,Yiwen Shi,Fan-Bo Meng,Chao Dai,Ashish Paramane
Epoxy (EP) resin insulations are widely used in electronic devices and power systems . They are gradually finding their way as winding insulation material for medium frequency transformers (MFT) due to their attractive insulating and adhesive properties along with low cost and easy processing. However, their dielectric insulation properties are compromised at high frequencies and high temperatures due to poor thermal properties. In this context, the surface-treated hexagonal boron nitride (h-BN) micro fillers and core-shell TiO 2 @SiO 2 nanofillers are doped in epoxy (EP) to enhance their thermal and electrical insulation properties under high frequencies and high temperatures. Results reveal that the thermal conductivity of the EP increases continually, whereas the electrical breakdown strength is reduced above the threshold content of micro/nano fillers. Particularly, the micro h-BN addition is beneficial for thermal conductivity enhancement, whereas the core-shell structure of TiO 2 @SiO 2 improves the electrical insulation properties of the EP. The multi-layer core model is used to explain the dynamics of the fillers. The homogeneous dispersion and optimal content of suitable micro-nano fillers can produce efficient EP composites as the electrical insulation for medium frequency transformers.
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DOI
高影响因子
Journal of Materials Chemistry C
·
2015
·Vol. 3
·期 31
·8050-8060
·
IF 4.696
Xianzhe Zeng,Yijie Zhou,Shidong Ji,Hongjie Luo,Heliang Yao,Xiao Huang,Ping Jin
Cesium-doped tungsten bronze CsxWO3 is an ideal near infrared (NIR) shielding material for solar filters. However, the CsxWO3 nanoparticle dispersed resin film exhibits obvious photochromic behavior under ultraviolet (UV) illumination, which severely hinders the commercial application of CsxWO3. In this paper, CsxWO3/SiO2 composite resin coatings were successfully prepared with excellent NIR shielding ability and outstanding optical stability under strong UV illumination by combining an ultraviolet-absorbing agent (UVA) with SiO2. The roles of UVA and SiO2 in preventing the photochromic behavior of the CsxWO3/SiO2 composite resin coating were vital, reducing the photochromic reaction rate by UVA and limiting the photochromic reaction areas by SiO2. In sum, our research provides a new solution for eliminating the photochromism of a CsxWO3-based resin film and it may have practical application in architecture and automobiles.
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DOI
高影响因子
RSC Advances
·
2019
·Vol. 9
·期 17
·9533-9545
·
IF 3.049
Chaoyang Jia,Junhong Zhao,Liling Lei,Xiyang Kang,Ran Lu,Chongtao Chen,Shunling Li,Yale Zhao,Qingxiang Yang,Zhijun Chen
In this paper, a novel adsorbent, Fe3O4@SiO2@PEI-NTDA, was first prepared by the immobilization of an amine and anhydride onto magnetic Fe3O4@SiO2 nanoparticles with polyethylenimine (PEI) and 1,4,5,8-naphthalenetetracarboxylic-dianhydride (NTDA) for the removal of heavy metal ions from aqueous solutions. The structure of Fe3O4@SiO2@PEI-NTDA was systematically investigated; the results confirmed that amine and anhydride groups were successfully covalently grafted onto the surface of Fe3O4@SiO2, which showed a homogenous core–shell structure with three layers of about 300 nm diameter (Fe3O4 core: 200 nm, nSiO2 layer: 20 nm, and PEI-NTDA layer: 20 nm). The adsorption performance of Fe3O4@SiO2@PEI-NTDA NPs was evaluated for single Pb2+ and coexisting Cd2+, Ni2+, Cu2+, and Zn2+ ions in an aqueous solution in a batch system. The amine and anhydride groups may have a synergistic effect on Pb2+ removal through electrostatic interactions and chelation; Fe3O4@SiO2@PEI-NTDA NPs exhibited preferable removal of Pb2+ with maximum adsorption capacity of 285.3 mg g−1 for Pb2+ at a solution pH of 6.0, adsorbent dosage of 0.5 g L−1, initial Pb2+ concentration of 200 mg L−1 and contact time of 3 h. The adsorption mechanism conformed well to the Langmuir isotherm model, and the adsorption kinetic data were found to fit the pseudo-second order model. Fe3O4@SiO2@PEI-NTDA NPs could be recovered easily from their dispersion by an external magnetic field and demonstrated good recyclability and reusability for at least 6 cycles with a high adsorption capacity above 204.5 mg g−1. The magnetic adsorbents showed high stability with a weight loss below 0.65% in the acid leaching treatment by 2 M HCl solution for 144 h. This study indicates that Fe3O4@SiO2@PEI-NTDA NPs are new promising adsorbents for the effective removal of Pb2+ in wastewater treatment.
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高影响因子
ELECTROCHIMICA ACTA
·
2014
·
IF 4.086
Huili Xie,Youhao Liao,Ping Sun,Tingting Chen,Mumin Rao,Weishan Li
Nano-SiO 2 as dopant was used for preparing polyethylene-supported poly(methyl methacrylate- co -butyl acrylate) (P(MMA- co -BA)/PE) based membrane and corresponding gel polymer electrolyte (GPE), which is applied to improve the cyclic stability of high voltage lithium ion battery . P(MMA- co -BA)/nano-SiO 2 /PE based membranes and corresponding GPEs were characterized with scanning electron spectroscopy, X-ray diffraction, electrochemical impedance spectroscopy, mechanical test, thermogravimetric analysis, linear sweep voltammetry, and charge/discharge test. It is found that the GPE with 5 wt.% nano-SiO 2 shows the best performance. Compared to the undoped membrane, the 5 wt.% nano-SiO 2 doped membrane has a better pore structure and higher electrolyte uptake, leading to the enhancement in ionic conductivity of the resulting GPE from 1.23 × 10 −3 to 2.26 × 10 −3 S.cm −1 at room temperature. Furthermore, the thermal stability of the doped membrane is increased from 300 to 320 °C while its decomposition potential of GPE is from 5.0 to 5.6 V (vs. Li/Li + ). The cyclic stability of Li/GPE/Li(Li 0.13 Ni 0.30 Mn 0.57 )O 2 cell at the high voltage range of 3.5 V ∼ 5.0 V is consequently improved, the capacity retention of the cell using the doped membrane is 92.8% after 50 cycles while only 88.9% for the cell using undoped membrane and 66.9% for the cell using liquid electrolyte.
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高影响因子
ELECTROCHIMICA ACTA
·
2017
·
IF 4.798
Weiyuan Huang,Youhao Liao,Guanjie Li,Zuyun He,Xueyi Luo,Weishan Li
In this paper, we design a novel gel polymer electrolyte (GPE), based on polyethylene (PE) supported poly(butyl methacrylate-acrylonitrile-styrene) (P(BMA-AN-St)) terpolymer reinforced by doping 10 wt.% nano-SiO 2 , to be possible application in high voltage lithium ion battery . The physical characterization indicates that P(BMA-AN-St)/SiO 2 /PE membrane has multi-layered and cross-linked network structure with the pore diameter of about 1 μm, leading to the highest electrolyte uptake ability of 257% compared with the value of 118% for PE support. Electrochemical performance exhibits that the corresponding GPE presents highest ionic conductivity of 1.9 × 10 −3 S cm −1 at room temperature and the improved oxidative stability from 4.2 V (PE support saturated with liquid electrolyte) to 5.2 V (vs. Li/Li + ). Thus, the high voltage cathode LiNi 0.5 Mn 1.5 O 4 using nano-SiO 2 doped GPE presents excellent cyclic stability and rate performance, which retains 93.0% of its initial discharge capacity after 150 cycles at 0.2 C rate and keeps 95.0% discharge capacity at 2 C rate of that at 0.1 C rate, while PE support saturated with liquid electrolyte has 87.9% capacity retention after 150 cycles and with the rate capacity value of 86.8% at the same rate test condition.
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高影响因子
ACS Applied Nano Materials
·
2026
·Vol. 9
·期 31
·14938-14948
·
IF 5.8
Chen Cen,Song Jiacheng,Liu Rui,Wei Jinxiu,Wang Xi,Liu Xiaohong,Li Yuye,Zhu Chengxi
Accurate and sensitive identification of pesticide residues
in
food is essential for food safety supervision and risk control. Herein,
a ratiometric electrochemical sensing platform based on a ferrocene-decorated
covalent organic framework/2D-SiO 2 /MWCNTs nanocomposite
(COFs/2D-SiO 2 /Fc/MWCNTs) was constructed for accurate quantification
of fenitrothion (FNT). The nanocomposite was synthesized via a mild
self-assembly approach, in which 2D-SiO 2 acted as a 2D
scaffold to improve the dispersion of COFs and promote the stable
immobilization of Fc. The crystalline porous COFs provided abundant
sites for FNT enrichment, the firmly immobilized Fc served as a stable
internal reference for ratiometric sensing, and the incorporated MWCNTs
effectively boosted the conductivity and electrocatalytic activity
of the nanocomposite. The obtained COFs/2D-SiO 2 /Fc/MWCNTs
nanocomposite showed favorable electrocatalytic performance toward
FNT. With the ratiometric signal I FNT /I Fc as
the readout, the sensor displayed a linear response from 0.0001 to
50 μg·mL –1 . Compared with conventional
single-signal sensors, this ratiometric method enables efficient self-calibration
against environmental interference, enhancing the accuracy and reliability
of FNT detection in food samples.
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高影响因子
危险品化学品经营许可证（带存储）