CEMENT AND CONCRETE RESEARCH
·
2025
·
IF 13.1
Haochuan Wang,Xin Liu,Chong Wang,Wei Wang,Jinxiang Hong,Pan Feng
Ultra-early mechanical properties are critical for shotcrete performance, significantly influenced by ettringite and calcium silicate hydrate (C-S-H) formed during the initial hydration stage and free water. This study investigates the individual and synergistic effects of these phases on mechanical behavior using equivalent cement pastes. In this system, cement was entirely replaced with dolomite particles of matching size distribution, with the controlled introduction of free water, ettringite, and C-S-H. The validity of these equivalent systems was confirmed through comprehensive characterization. Mechanical performance was subsequently evaluated using compression, shear, Vickers hardness and nanoindentation tests. Results revealed that free water remarkably weakened the mechanical properties, whereas both ettringite and C-S-H enhanced strength by reducing voids and reinforcing weak particle interfaces. Ettringite primarily contributed to interparticle friction, while C-S-H enhanced cohesion at interfaces including dolomite-dolomite, dolomite-ettringite and ettringite-ettringite contacts. When co-existing, C-S-H formed within the porous ettringite network, not only establishing a multi-scale filling structure but also stabilizing the dolomite-ettringite skeleton. These findings advance our understanding of the early-age mechanical development of shotcrete and highlight the potential of equivalent cement systems as robust tools for research into cementitious materials.
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DOI
高影响因子
COMPOSITE STRUCTURES
·
2025
·
IF 7.1
Fan Xie,Qiaoling Liu,Longhai Zhuo,Haitao Wei,Yuxuan Shang,Tao Liu,Zhaoqing Lu
High-performance electromagnetic interference (EMI) shielding materials with lightweight, multi-resistant properties and superior, tunable EMI shielding performance are urgently needed for next-generation integrated electronic and communication systems, particularly in portable smart devices and artificial intelligence applications. In this work, hollow h-MXene/ANF backbones with a continuous shielding network were fabricated using a facile vacuum-assisted filtration process combined with a sacrificial template method. The structurally engineered h-MXene/ANF hybrid films achieved outstanding EMI shielding effectiveness (EMI SE) of 78.9 dB and EMI specific shielding effectiveness per unit thickness (SSE/t) of 15703 dB·cm 2 ·g –1 . These exceptional properties are attributed to high ohmic losses, multiple internal reflections, polarization relaxation, and efficient losses in the hollow MXene conductive layer, facilitated by impedance mismatches within the sandwich structure. Notably, the EMI SE performance can be tuned by adjusting the content of hollow MXene microspheres. In addition, extensive hydrogen-bonding interactions between the high-performance ANF and MXene contribute to enhanced mechanical properties, including tensile strength of up to 37 MPa, as well as excellent thermal stability and self-cleaning capabilities. Overall, the sandwich-structured h-MXene/ANF hybrid films exhibit superior mechanical strength, multi-resistant properties, and ultra-high, tunable EMI shielding performance, making them promising candidates for advanced EMI shielding in next-generation portable smart electronic devices.
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高影响因子
Journal of Environmental Chemical Engineering
·
2023
·
IF 7.7
Jing Wang,Jia-Wei Fang,Zhi-Yong Ji,Zhi-Yuan Guo,Xin-Wei Li,Jie Liu,Ying-Ying Zhao,Zhong Liu,Feng-Feng Gao,Yuan Zhong,Jun-Sheng Yuan
Lithium extraction from the solution in low Li + concentration by an energy-saving and high-efficiency method is still a challenge. Herein, a novel hollow porous LiMn 2 O 4 (H-LMO) with highly active site was proposed to enhance the extraction performance of Li + . Based on the established hollow porous structure, the H-LMO film electrode (H-LMOE) exhibits excellent lithium electrosorption performance and stability. Under the current density of 0.5 C, the electrosorption capacity of Li + could reach 31.52 mg/g, the separation coefficient of Li + /Mg 2+ was 581.67, and the energy consumption was as low as 0.49 Wh/mol Li. This unique structural strengthening mechanism made H-LMOE maintain a good Li + extraction performance even in a solution of low Li + concentration. The Li + electrosorption capacity of H-LMOE was 2.13 times that of T-LMOE in a 60 mg/L Li + solution, while the specific energy consumption of the H-LMOE was 15.78% lower than that of the traditional-LiMn 2 O 4 film electrode (T-LMOE). Even in a 10 mg/L Li + solution, the electrosorption capacity of H-LMOE was 21.48 mg/g, which was 10.0% higher than that of T-LMOE. Moreover, after 50 recycling processes, the final electrosorption capacity of the H-LMOE was about 25.0% higher than that of the T-LMOE.
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高影响因子
INORGANIC CHEMISTRY
·
2021
·
IF 5.165
Xueyu Wang,Songdong Ding,Zhipeng Wang,Lianjun Song,Xiuying Yang,Qian Xiao,Haowei Xu,Junli Wang,Zhen Shen,Hui Wang
Effective and selective separation of technetium from acidic nuclear liquid waste is highly desirable for partitioning and transmutation but is of significant challenge. Highly efficient extraction of pertechnetate can be achieved by taking H-bonding and electrostatic interaction combined strategy. Base on this strategy, an amine–amide ligand NTAamide(n-Oct) was employed to extract TcO4– in HNO3 solution. Using n-dodecane as a diluent, NTAamide(n-Oct) demonstrated excellent extractability and good selectivity toward TcO4– with a rapid extraction equilibrium that could be reached in less than 1 min. Its maximal loading capacity for TcO4– was almost 100 times as much as that of traditional amine extractant Aliquat-336 nitrate. Meanwhile, TcO4– could be efficiently stripped from the loaded organic phase by (NH4)2CO3 solution. Slope analysis indicated the formation of a 1:1 complex of NTAamide(n-Oct) with TcO4–. The extraction conformed to the anion exchange extraction model, as confirmed by analyses of single-crystal X-ray diffraction, 1H NMR titration, FTIR, and ESI-MS.
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PubMed
高影响因子
Journal of Materials Chemistry B
·
2017
·Vol. 5
·期 17
·3111-3121
·
IF 4.543
Yan-Ling Luo,Xue-Yin Zhang,Yuan Wang,Fang-Jie Han,Feng Xu,Ya-Shao Chen
pH-Sensitive H-type multiblock copolymers, namely, poly(methacrylic acid)2-block-epoxidized hydroxyl-terminated polybutadiene-block-poly(methacrylic acid)2 (PMAA2-b-epoHTPB-b-PMAA2), were synthesized by atom-transfer radical polymerization and subsequent in situ epoxidation by peracetic acid and characterized by 1H NMR, FT-IR and SEC techniques. The impact of epoxidation on the physicochemical and biomedical properties of copolymer self-assembly micelle nanoparticles was investigated by fluorescence spectrometry, DLS, TEM and an MTT assay. The experimental results indicated that epoxidation resulted in the formation of more stable copolymer micelle nanoparticles with a lower critical micelle concentration, smaller micelle size, and higher loading capacity and encapsulation efficiency of drugs than those without epoxidation. In particular, epoxidized copolymer micelle nanoparticles exhibited reasonable pH sensitivity at a pH of 5.3–5.6. The hydrophobic anticancer drug paclitaxel (PTX) displayed faster release rates from epoxidized nanomicelles than from unepoxidized nanomicelles in a PBS solution of a pH of 4.8–6.6, whereas in PBS of a pH of 7.4 smaller amounts of PTX were released from epoxidized nanomicelles than from unepoxidized nanomicelles. Epoxidized copolymer nanomicelles were reasonably biodegradable after the drug was released, and their degradation rate was faster than that of their unepoxidized counterparts. An MTT assay was performed to determine the biocompatibility of epoxidized copolymer micelle nanoparticles and the anticancer activities of PTX-loaded nanomicelles, which were important for applications in the therapy of cancers as a controlled-release drug carrier.
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PubMed
高影响因子
CATALYSIS LETTERS
·
2019
·Vol. 149
·期 8
·2078-2088
·
IF 2.372
He Xiaoxia,Chen Yu,Liu Ya,Fang Lina,Chen Zeng,Ji Hongbing
Abstract A series of metal-modified hierarchical M/H-ZSM-5 catalysts were prepared for catalytic conversion of cellulose in an aqueous medium. Characterization of the catalysts showed that the impregnation of metal into H-ZSM-5 did not change the basic framework and pore structure of H-ZSM-5, but it decreased the total acidity. Analysis of the products indicated that the catalysts significantly affected products distribution. When Co/H-ZSM-5 and Fe/H-ZSM-5 were used as the catalysts, the yields of lactic acid and cyclic ketones obviously increased. At last, a recommendable catalytic transformation pathway of cellulose over M/H-ZSM-5 was proposed on the basis of the obtained experimental results and the published literatures. Graphical Abstract In this paper, a series of metal-modified hierarchical M/H-ZSM-5 (M = Ce, Co, Ga, and Fe) catalysts were prepared and employed in catalytic conversion of cellulose in aqueous media to examined the products distribution of cellulose catalytic conversion. Based on our results and previous works, the plausible general reaction pathways of cellulose over M/H-ZSM-5 were proposed.
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高影响因子
FUEL
·
2020
·
IF 5.578
Jing-Pei Cao,Tao Xie,Xiao-Yan Zhao,Chen Zhu,Wei Jiang,Ming Zhao,Yun-Peng Zhao,Xian-Yong Wei
Selective hydrogenolysis, the aromatic ether C-O bonds under mild conditions, is crucial for the valorization of lignin. In this context, the effects of H 2 and solvent on the hydrogenolysis of lignin model compounds over Ru catalysts were explored. With H 2 as hydrogen donor, the Ru/AC exhibited the highest activity for converting lignin model compounds into monomeric compounds, whereas H 2 led to low selectivity of aromatics. However, isopropanol was the good H-donor solvent, which could provide a large amount of active hydrogen to promote the cleavage of C-O bonds. Additionally, the yield of aromatics in isopropanol was higher than that under H 2 atmosphere. It could be ascribed to the fact that isopropanol is the protic solvent which displays Lewis basicity, and is a good H-bond donor and a good H-bond acceptor. The higher electron-releasing inductive effect of isopropanol made it easier to provide active hydrogen. Based on the experiments, the mechanism of benzyl phenyl ether hydrogenolysis in H 2 and isopropanol system was presented.
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高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Wenhao Luo,Canfeng Wu,Liangjie Li,Tingting Jia,Shuhui Yu,Yingbang Yao
In this study, hexagonal boron nitride (h-BN) - polyetherimide (PEI) composites were prepared by a simple solution casting method, where the h-BN particles were aligned by an external magnetic field. Prior to the preparation of the composite samples, the h-BN platelets were firstly decorated by iron oxide nanoparticles (Fe 3 O 4 ) to achieve the desired magnetic properties . Due to the alignment of h-BN particles, the composite exhibited greatly enhanced thermal conductivity along that direction. At a filler loading of 20 wt%, an enhancement of 166% was obtained, compared to that of the unaligned composite. Furthermore, the composite samples showed a low dielectric loss (~ 0.01) with the filling ratio below 20 wt% and a tensile modulus of up to 2.34 GPa. Bearing such thermal conductivity , electrical insulation properties, and mechanical properties , these composites with magnetically aligned h-BN particles show potentials for microelectronic packaging applications.
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高影响因子
CATALYSIS LETTERS
·
2018
·Vol. 148
·期 11
·3445-3453
·
IF 2.911
Li Xia,Dong Hao,Wang Bo,Lv Jun,Xu Guangqing,Wang Dongmei,Wu Yucheng
Firstly, h-CdS/c-CdS homojunction was prepared by solvothermal method with controlling the Cd-to-S molar ratio. Then, the MoS 2 /h-CdS/c-CdS nanocomposites were constructed by ultrasonic method with different MoS 2 amount. The experimental results showed that when the molar ratio of Cd and S was 1:1 and the amount of MoS 2 was 1.5 wt%, the MoS 2 /h-CdS/c-CdS nanocomposites exhibited excellent photocatalytic performance for hydrogen evolution under visible light. The total amount of hydrogen evolution was 3753.12 µmol for 5 h, and its average hydrogen evolution rate was 40.79 mmol h −1 g −1 with an apparent quantum efficiency of 38.16% irradiated at 420 nm, which was about 7.3 times when compared with the h-CdS/c-CdS homojunction (Cd:S = 1:8). The enhanced photocatalytic performance of MoS 2 /h-CdS/c-CdS could be attributed to the improved specific surface area and formation of well bonded interface structure, which not only enhanced the response to visible light but also decreased the recombination rates of photogenerated charge carriers. Graphical Abstract
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高影响因子
RSC Advances
·
2019
·Vol. 9
·期 25
·14286-14295
·
IF 3.049
Wenhui He,Yawen Wang,Caimei Fan,Yunfang Wang,Xiaochao Zhang,Jianxin Liu,Rui Li
The introduction of oxygen vacancies (OVs) on the surface of photocatalysts has already been proven to be an effective way to extend the light response to visible light and trap charge carriers, thereby promoting the photocatalytic performance. In this study, h-BN/OV-BiOCl composites were prepared using hexagonal boron nitride (h-BN) to further improve the visible-light photocatalytic activity of oxygen-vacancy-enriched bismuth oxychloride (OV-BiOCl). The composition and morphology of these materials were investigated, and the photocatalytic performance experiments showed that the introduction of h-BN could significantly improve the visible-light photocatalytic activity of OV-BiOCl, which was 1.7 and 1.4 times that of pure OV-BiOCl for the degradation of rhodamine B (RhB) and bisphenol A (BPA) when the h-BN content was 5 wt%, respectively. The role of h-BN was comprehensively investigated, and the results revealed that the presence of negatively charged h-BN could improve the separation efficiency of photoinduced electrons (e−) and holes (h+) by promoting the migration of positively charged h+ to the surface of the photocatalyst, as expected. Moreover, the oxygen vacancies in OV-BiOCl were increased in the presence of h-BN; this favored the activation of more adsorbed O2 for the oxidation of pollutants. Finally, a probable mechanism was proposed for the improved photocatalytic activity of the h-BN/OV-BiOCl composites. This study provides an insight into the roles of h-BN in oxygen-vacancy-enriched photocatalysts.
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PubMed
高影响因子
MedChemComm
·
2013
·Vol. 5
·期 2
·147-152
·
IF 2.722
Haiqing Dong,Chunyan Dong,Wenjuan Xia,Yongyong Li,Tianbin Ren
A novel prodrug of pegylated methotrexate conjugates (PMCs) with a high drug-carrying capability and a redox sensitive drug release mechanism was reported for intracellular drug delivery. The PMC was structured in a H-shape with four molecules of anticancer drug methotrexate (MTX) linked to both ends of the PEG main chain via disulfide linkers, resulting in the conjugates with a high and constant drug loading efficiency of up to 26 wt%. The amphiphilic property of PMCs enables them to self-assemble into nanoparticles in aqueous solution, while the cleavable disulfide linkers allow the conjugated MTX to exert its therapeutic activity due to the fast cleavage of disulfide linkers when exposed to the intracellular concentration of glutathione (GSH). Cell proliferation assays performed with HepG2 cancer cells confirmed the pharmacological efficacy.
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高影响因子
Journal of Energy Storage
·
2024
·
IF 8.9
Wei-Xiang Cheng,Ting-Ting Mao,Yi-Zhao Chen,Shuai-Fu Cui,Jing Chen,Dao-Ren Deng,Ru-Ming Feng,Song-Yi Liao,Yong-Gang Min
In this paper, cubic ZnSn(OH) 6 with MXene were firstly in-situ synthesized, and subsequently vulcanized and etched to obtain hollow SnS nanoboxes with MXene coating by carbon layer (referred to as H-SnS/MXene@C). The composition and surface chemical state of H-SnS/MXene@C were characterized by XRD and XPS , respectively. The microscopic morphology of H-SnS/MXene@C was analyzed and characterized in detail by SEM and TEM, and the results show that the hollow SnS nano-boxes formed an effective connection with the MXene nanosheets . When used as LIBs anode, the H-SnS/MXene@C maintained ∼707 mAh/g after 200 cycles at 0.5 A/g current density. As a NIBs anode material, the H-SnS/MXene@C delivered ∼402 mAh/g after 150 cycles at 0.5 A/g current density. In addition, a detail simulation/calculation revealed that H-SnS/MXene@C demonstrated a higher pseudocapacitance (83.2 % for LIBs and 74.4 % for NIBs at a scan rate of 2 mV/s, respectively). The synergistic effect of the highly conductive MXene and the three-dimensional hollow cubic structure could effectively provide an efficient channel for charge transfer and ionic diffusion in H-SnS/MXene@C anode.
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高影响因子
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