JOURNAL OF ENVIRONMENTAL MANAGEMENT
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2025
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IF 8.4
Limei Xu,Zining Wang,Hanyu Zhang,Aoxue Sun,Gaoxiang Zhou,Ruixue Jiang,Tiantian Chen,Yong Wang,Xiaochen Li
So far, potential chronic risks of silver nanoparticles (AgNPs) on organisms remain largely unknown, especially molecular-level alterations at the environmentally relevant concentrations. In this study, Chlamydomonas reinhardtii ( C. reinhardtii ) is used as the model organism to investigate chronic toxic effects of 100 μg/L and 50 mg/L AgNPs for 120 d. Physiological studies showed that AgNPs attached on cell surface and internalized into algal cells, inducing the increase in cell permeability, the decline in cell size and granularity, the damage in photosynthetic systems, and the production of reactive oxygen species (ROS). The damage in photosynthetic systems was reflected in the decline in the photosynthetic activity ( F v / F m ), photosynthetic efficiency ( F v / F 0 ), and fluorescence intensities of Peridinin-Chlorophyll Protein Complex and Allophycocyanin. C. reinhardtii attempted to increase the absorption (ABS/RC), dissipation (Dl 0 /RC) and trapping (TR 0 /RC) of light energy for adapting AgNPs stress. In addition, the accumulation of glutathione (GSH), ascorbate (ASC), and the irreversible cell apoptosis was observed in 50 mg/L AgNPs group. Transcriptomics showed that most of genes involved in photosynthetic systems (e.g. photo-oxidation, light harvesting, and chlorophyll synthesis) were down regulated, providing evidence for chloroplast as the main target of AgNPs toxicity. The up-regulation of some genes, involved in ASC and aldarate metabolism, and GSH metabolism, showed self-adaptive capacity of C. reinhardtii to eliminate ROS under long-term exposure to AgNPs. Phagocytosis and endocytosis were the main pathways of the internalization of AgNPs. This study provided valuable data for potential chronic risks of nanoparticles in aquatic environment.
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COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
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2024
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IF 4.9
Chenzhao Wang,Xiujuan Wang,Yuhao Jiang,Zhiyu Wu,Jiawei Yang,Shanshan Wei,Zhibing Wang,Guoying Sun
Trypsin is a kind of digestive enzyme capable of catalyzing the hydrolysis of proteins. Abnormal changes in the levels of trypsin can cause a series of pancreatic-related diseases. Therefore, based on the special interface interaction between green-emitting ionic liquid-based carbon dots (G-CDs) and BSA, a highly sensitive fluorescence "on-off" mechanism was developed for detecting trypsin in urine. The G-CDs were synthesized by a one-step hydrothermal approach using 2,5-dihydroxybenzoic acid (2,5-DHBA) and 1-octyl-3-methylimidazolium tetrafluoroborate ([OMIM]PF 4 ). The interaction between G-CDs and bovine serum albumin (BSA) led to the formation of the G-CDs-BSA fluorescence sensing system, which induced aggregation and fluorescence enhancement of G-CDs. The G-CDs-BSA system was disrupted under optimal incubation conditions after the addition of trypsin, and the fluorescence was quenched. According to the fluorescence quenching value (∆F) of the system, the quantitative analysis of trypsin in urine was realized and demonstrated good recoveries. This study not only developed a novel fluorescence sensing system with excellent performance for trypsin detection, but also provided a theoretical basis for the binding of carbon dot-protein systems.
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CHEMOSPHERE
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2024
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IF 8.1
Jia-Xin Dai,Yanshuang Yu,Le-Xing You,Hong-Lin Zhong,Yuan-Ping Li,Ai-Jun Wang,Jon Chorover,Ren-Wei Feng,Hend A. Alwathnani,Martin Herzberg,Christopher Rensing
Although the antimicrobial mechanisms of nanomaterials have been extensively investigated, bacterial defense mechanisms associated with AgNPs have not been fully elucidated. We here report that dissolved Ag + (>0.05 μg mL −1 ) displayed higher toxicity on cell growth of strain Cupriavidus metallidurans BS1 (GCA_003260185.2) in comparison to 2 and 20 nm AgNPs. The genes necessary for synthesis of distinct abundance and composition of extracellular polymeric substances (EPS) were induced in strain BS1 exposed to Ag stress. This resulted in 20.1% (Ag(I)-EPS) and 24.2% (2 nm AgNPs-EPS) of the C O band integrated intensities being converted into C-OH/C-O-C group vibrations and the Ag-O bond was formed between EPS and 20 nm AgNPs. Meanwhile, the expression of primary resistance genes of the cus, sil and cup operon encoding HME-RND-driven efflux systems as well as a P IB1 -type ATPase (CupA) were significantly induced after exposure to Ag(I), 2 and 20 nm AgNPs, respectively. Furthermore, distinct genes involved in biosynthesis pathways responsible for production of EPS were induced to relieve the toxicity of Ag(I), 2 nm and 20 nm AgNPs. This combined action is one potential reason why strain BS1 displayed distinct resistances in response to Ag(I) compared to 2 and 20 nm AgNPs. This work will help in understanding processes important in bacterial defensive mechanisms to AgNPs.
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Cell Reports Physical Science
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2024
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IF 7.9
Bing Liu,Juan Liu,Cheng Chao Hu,Kai Xin Song,Yu Hui Huang
Microwave dielectric ceramics (MWDCs) are essential in low-temperature co-fired ceramic (LTCC) technology, necessitating a low sintering temperature, low dielectric constant ( ε r ), and high quality factor ( Qf ). On the other hand, the mismatch in the coefficients of thermal expansion (CTEs) between MWDCs and electrodes poses reliability challenges. Here, we report BaF 2 -LiF ceramics to address the need for low- ε r , high- Qf materials with high CTEs. The BaF 2 -LiF ceramics exhibit improved properties, including a substantial decrease in sintering temperature from 1,025°C to 700°C, enhanced relative density from 90.8% to 97.3%, and optimized Qf values increased by 20%. Moreover, the resulting ceramics demonstrate a high CTE of 20.6 ppm/°C, ensuring compatibility with polymer-based laminates and metal electrodes. Additionally, the BaF 2 -LiF ceramics serve as a promising dielectric resonator for high-performance millimeter-wave antennas. This study presents a comprehensive approach to optimize BaF 2 ceramics, addressing key parameters for high-reliability LTCC electronics and millimeter-wave antenna applications.
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TALANTA
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2024
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IF 5.6
Huanhuan He,Jia Zheng,Jian Su,Lian Xia,Yue Tang,Yuangen Wu
A novel aptamer LFA (Apt-LFA) strip is first constructed for ethyl carbamate (EC) detection, in which cationic polyethyleneimine (PEI) and anionic polyacrylamide (APAM) are used as double-capture agents. The black NiCo 2 O 4 nanoparticles (NCO NPs) encapsulated by EC1-34 aptamer are employed as recognition probes. The added EC will bind to EC1-34 aptamer on the probes, so that the test-line (T-line) immobilized with APAM can electrostatically capture the exposed NCO NPs. The control-line (C-line) sprayed with PEI can capture the excessive black recognition probes. The peroxidase-like activity of bimetallic NCO NPs is employed as signal amplification to improve the sensitivity of Apt-LFA strip. The naked eye discernible concentration of EC is 5 μg L −1 and the detection limit (LOD) is as low as 1.36 μg L −1 . The Apt-LFA strip has the advantages of strong stability, simplicity and low cost, which provide a new method for EC detection and offer a new way for designing LFA.
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INORGANIC CHEMISTRY
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2024
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IF 4.3
Linfeng Dong,Bohui Xu,Deshuai Xiao,Fan Liu,Xinyuan Zhang,Xuanlin Pan,Pifu Gong,Zheshuai Lin
Optoelectronic materials with excellent birefringent properties are of significant importance in the fields of optical communications and laser technology. Recently, rare earth (RE) chalcogenides with anisotropic [RESn] groups have been proven to be high-performance infrared birefringent materials. Herein, we demonstrate that the addition of planar groups can further increase the birefringence in RE chalcogenides, as realized by incorporating planar [AgS3] groups into the RE-I-IV-S4 family for the first time. The newly obtained LaAgSiS4 compound shows higher polarity anisotropy than its homologue LaLiSiS4 and LaKSiS4, which resulted in a larger birefringence (0.12@600 nm) at least twice as large as that of the latter two compounds (0.05/0.06@600 nm). The structure–property relationship of LaAgSiS4 was investigated through structural analysis and first-principles calculations. The results indicate that the increased optical birefringence in LaAgSiS4 originates from the synergic effects of the distorted [LaSn] polyhedra and planar [AgS3] triangles. This work provides an effective strategy for enhancing optical birefringence in IR chalcogenides.
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Journal of Materials Chemistry C
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2024
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IF 5.7
Bin Liu,Junhan Guo,Yang Tang,Liang Qin,Zhidong Lou,Yufeng Hu,Feng Teng,Yanbing Hou
Micro–nano organic–inorganic hybrid lead halide perovskites have become some of the most promising materials for optoelectronic applications due to their excellent photoelectric properties. The micro–nano scale laser device made using these materials would be an ideal light source for integrated photonics. The preparation methods of perovskite crystals grown via solution processing have improved a lot, but it is difficult to prepare discrete Fabry–Pérot (F–P) mode optical resonators with high-quality factor and small volume on the substrates due to random nucleation and excessive nucleation points. Hence, we used silver nanowires to induce the crystallization of perovskite crystallites, forming a perovskite/silver coupling structure and achieving an efficient laser. The directional distribution matrix of perovskite crystallites was obtained by adjusting the directional distribution of silver nanowires by using a controllable pulling method. By adjusting the concentration of the perovskite precursor solution, the aspect ratio of the crystallized perovskite microcrystals can be regulated, thus achieving the resonance modes of different perovskite microcavities. The results would open up an alternative approach to achieve controllable growth of perovskite crystallites.
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INTERNATIONAL JOURNAL OF THERMAL SCIENCES
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2024
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IF 4.9
Xilong Ding,Yunpeng Jiang
In this study, glass bubbles (GBs) and gallium-based liquid metal (LM) were combined at varying volume fraction ratios to prepare the composites (GB-LMs), with the objective of optimising their state of matter and overall properties. Furthermore, the incorporation of high thermal conductive particles, including copper and silver, was pursued in augmenting the thermal conductive efficiency of the resulting composites. The thermal conductivity (TC), electrical conductivity (EC) and density were measured in order to construct a comprehensive structure - property relationship, while the underlying microphysical mechanisms were elucidated through the numerical simulations based on the distinctive architectures observed. As the loading of LM droplets increases, the GB-LMs undergo a transition from a scattered state to a thick pasty state and then to a dilute gel state. The composite sample with a loading of 32 % LM droplets exhibited a moderate pasty state, with a TC of 4.7 W/(m·K), an EC of 380 S/m, and a density of 2.4 g/cm 3 . The introduction of copper or silver powders into the GB-LMs resulted in a TC of 8.0 W/(m·K), an EC of 1.59 × 10 4 S/m and a low density of 3.2 g/cm 3 . The incorporation of high TC particles into GB-LMs has the potential to markedly improve the TC-to-density ratio of the composite system. These findings facilitate the implementation of LM-based composites in the advanced thermal management.
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CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Chaochen Chen,Fang Lei,Ying Shi,Jianjun Xie,Lei Zhang,Lingcong Fan
The surface metallization of Si 3 N 4 ceramics with the Ag–Cu conductive paste containing CuO was systematically investigated. The interfacial reactions between CuO and Si 3 N 4 promoted the surface metallization of the ceramic substrate in an argon atmosphere. The effects of Ag and Cu relative contents on the evolution of the thick film surface morphology were studied. The electrical properties and tensile strength of composite ceramic substrates were enhanced through the generation of Ag–Cu eutectic solution within the thick film layer. The effect of brazing time on the properties of Ag–Cu/Si 3 N 4 composite ceramic substrates was investigated. Mechanical testing and scanning electron microscopy (SEM) were used to analyze the interface tensile strength of the Ag–Cu/Si 3 N 4 composite substrates and the morphology of the Ag–Cu film, and the bonding mechanism of the composite ceramic substrate was studied. When the sample was brazed at 800 °C for 20 min, the maximum tensile strength of 23.6 MPa between the Ag–Cu film and ceramic substrate was obtained, the lowest resistivity of 6.22 μΩ•cm was obtained. The bonding interface between thick film layer and the ceramic substrate formed the Ag–Cu mechanical structure was benefit for improving the comprehensive performance of the Cu/Si 3 N 4 composite ceramic substrate.
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CERAMICS INTERNATIONAL
·
2024
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IF 5.1
Naiqiang Wang,Xiaoqing Si,Baiqi Zhang,Jianwei Gao,Mingsheng Li,Tong Lin,Rui Li,Chun Li,Junlei Qi,Jian Cao
A novel sintered-joining of Al 2 O 3 and AlN is achieved for the first time using micro-Ag particle interlayers in air. In comparison with reactive air brazing , this method addresses the issue of reduced strength caused by air holes in brazed joints . Also, this sintered-joining method can be performed at a lower temperature (920 °C), improving the joint strength by relieving the residual stresses. The sintering effect of micro-Ag particles and their high density of dislocations promote the recovery and recrystallization of the Ag interlayer, as well as the interdiffusion of Ag and ceramic. Ag–O clusters formed at the interface can be embedded into oxygen vacancies on the ceramic surface, playing a key role in interfacial joining. By optimizing joining temperature, assembly pressure and holding time, a maximum joint shear strength of 85.2 MPa is achieved at 920 °C for 30 min with an assembly pressure of 1 MPa. This study successfully prepares Al 2 O 3 /AlN joints with excellent mechanical properties, providing a reliable foundation for the fabrication of power integrated circuits with efficient operation.
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INTERNATIONAL JOURNAL OF BIOLOGICAL MACROMOLECULES
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2025
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IF 8.5
Shurui Yi,Xue Lv,Xikun Zhang,Junzheng Chen,Di Fang,Huiwen Jia,Yanmin Ma,Wang Xu,Xiaoning Yang
In this paper, the dispersion stability of graphene was effectively promoted by the introduction of hydroxypropyl cellulose (HPC), a novel composite hydrogel PAM-LMA-PDA@TiO 2 -GN was prepared. Polyacrylamide (PAM) provided the basic three-dimensional network structure, lauryl methacrylate (LMA), as the hydrophobic monomer, constructed the hydrophobic associative micro-regions inside the hydrogel, which enhanced the structural stability, and polydopamine-coated TiO 2 (PDA@TiO 2 ), as a nano-toughness enhancement point, which endowed the hydrogel with a stress and strain of 1026 kPa and 2519 %, respectively. Hydrogels loaded with Ag nanowires (Ag NWs) and graphene (GN) were prepared using Ag nanowires as the intercalating agent, graphene as the substrate and hydrogel as the carrier, graphene and Ag nanowires endow the hydrogels with excellent electron transport capabilities. The rate constant k for Rhodamine B (Rhb), methylene blue (MB) and 4-nitrophenol (4-NP) were 0.657, 0.528 and 0.367 min −1 , respectively, and the hydrogel showed good stability and recoverability in the catalytic reaction. In addition, graphene and Ag nanowires endowed the hydrogel with excellent electrical conductivity, the hydrogel has high sensitivity (gauge factor = 10.46), fast response time (153 ms), and excellent cyclic stability, which can be used as a flexible sensor to detect a wide range of human activities, making it an ideal candidate for flexible sensors.
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Advanced Healthcare Materials
·
2024
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IF 10
Mingjie Sun,Yang Lu,Hongrui Zhang,Weiqian Jiang,Wenzhao Wang,Xiao Huang,Shichun Zhang,Dulei Xiang,Boyu Tang,Yu Chen,Tingmei Chen,Chengjie Lian,Jian Zhang
The management of infected bone defects poses a significant clinical challenge, and current treatment modalities exhibit various limitations. This study focuses on the development of a multifunctional composite scaffold comprising nanohydroxyapatite/polyethyleneglycol diacrylate matrix, silver nanoparticles, graphene oxide (GO), sodium alginate, and M2-type macrophage membrane vesicles (MVs) to enhance the healing of infected bone defects. The composite scaffold demonstrates several key features: first, it releases sufficient quantities of silver ions to effectively eliminate bacteria; second, the controlled release of MVs leads to a notable increase in M2-type macrophages, thereby significantly mitigating the inflammatory response. Additionally, GO acts synergistically with nanohydroxyapatite to enhance osteoinductive activity, thereby fostering bone regeneration. Through meticulous in vitro and in vivo investigations, the composite scaffold exhibits broad-spectrum antimicrobial effects, robust immunomodulatory capabilities, and enhanced osteoinductive activity. This multifaceted composite scaffold presents a promising approach for the sequential treatment of infected bone defects, addressing the antimicrobial, immunomodulatory, and osteogenic aspects. This study introduces innovative perspectives and offers new and effective treatment alternatives for managing infected bone defects.
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