ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
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2016
·Vol. 24
·期 2
·1757-1768
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IF 2.76
Zhao Yanxia,Sun Yangyang,Tian Chang,Gao Baoyu,Wang Yan,Shon Hokyong,Yang Yanzhao
Titanium-based coagulation is expected to achieve both efficient water purification and sludge recycling. This study is the first attempt to use titanium tetrachloride (TiCl 4 ) for silver nanoparticle (AgNP)-humic acid composite contaminant removal in a coagulation-ultrafiltration (C-UF) process, where characterization of flocs and membrane fouling under varied coagulant dose, initial solution pH, and AgNP concentration conditions are the main contents. Results suggested that the TiCl 4 achieved high AgNP removal in the form of silver nanoparticle through adsorption and sweep flocculation and simultaneously exerted additional 68.2 % higher dissolved organic carbon removal than Al 2 (SO 4 ) 3 . The TiCl 4 produced larger and stronger flocs but with weaker recoverability and less compact degree than did Al 2 (SO 4 ) 3 . Floc properties were independent of AgNP concentration except floc fractal dimension, which was negatively correlated with AgNP concentration. The TiCl 4 precoagulation caused less membrane fouling within wider pH range than Al 2 (SO 4 ) 3 did in the C-UF process. Incorporation of AgNPs during the TiCl 4 pretreatment process facilitated the mitigation of membrane fouling, which was, however, negligibly influenced by AgNP concentration in the case of Al 2 (SO 4 ) 3 .
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JOURNAL OF ALLOYS AND COMPOUNDS
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2024
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IF 5.8
Wenbing Huang,Haojie Yu,Li Wang,Dingning Chen,Xudong Wu,Yanhui Zhang,Jiawen He,Chenguang Ouyang,Lei Zhang
Electrical contact materials (ECMs) play a pivotal role in maintaining the stability and efficiency of electrical instruments and electronic devices by regulating the current flow. As an essential member of ECMs, W-Ag matrix composite ECMs (W-Ag-MC-ECMs) are integral, demonstrating commendable resistance to welding and arc erosion. However, the limited wettability between the two phases curtails their broader applications. Herein, Ag-Cu and Ag-Ni bimetallic layer-encapsulated tungsten powders were designed and successfully synthesized through a two-step electroless plating process. Subsequently, the W-Ag-MC-ECMs were fabricated following the powder metallurgy route, including the solution ball milling process and the spark plasma sintering technique. The results indicated that Cu-Ag solid solution and Ni with a metal binder effect could strengthen the interface bonding, which can dramatically improve the microhardness (up to 182HV), strength (up to 600 MPa), ductility (up to 24 %) and resistance to arc erosion (nearly two times longer service life). In addition, during the arc erosion, attributed to the Cu-Ag solid solution effect of W@Ag@Cu/Ag-MC-ECMs and solution-strengthening effect of W@Ag@Ni/Ag-MC-ECMs, the work function increases and the arc energy decreases, which reduces mass loss and extends the service life of the contacts.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2024
·Vol. 31
·期 26
·38298-38309
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IF 0
Yang Yihuai,Hu Xianzhi,Zi Futing,Chen Shuliang,Zhao Li,Li Xinrong,Lin Yue
Thiosulfate gold leaching is one of the most promising green cyanide-free gold extraction processes; however, the difficulty of recovering Au(I) from the leaching system hinders its further development. This study prepared aminoguanidine-functionalized microspheres (AGMs) via a one-step reaction involving nucleophilic substitution between aminoguanidine hydrochloride and chloromethylated polystyrene microspheres and used AGMs to adsorb Au(I) from thiosulfate solutions. Scanning electron microscopy, Brunauer–Emmett–Teller analysis, Fourier transform infrared spectroscopy, and X-ray photoelectron spectroscopy were used to analyze the structure and properties of AGMs. Experiments were designed to investigate the effects of pH, temperature, initial Au(I), and thiosulfate concentrations on the gold adsorption performance of AGMs. Results demonstrated that AGMs can efficiently adsorb Au(I) from thiosulfate solutions in a wide pH range. The adsorption process conforms to the pseudo-second-order kinetic model and Langmuir isotherm model, with a maximum capacity of 22.03 kg/t. Acidic thiourea is an effective desorbent, and after four adsorption–desorption cycles, the adsorption rate of Au(I) by AGMs is 78.63%, which shows AGMs have good cyclic application potential. Based on the results of characterization, experiments, and density functional theory calculations, the mechanism for the adsorption of [Au(S 2 O 3 ) 2 ] 3− on AGMs involves anion exchange. Importantly, AGMs exhibited satisfactory adsorption property for Au(I) in practical Cu 2+ –NH 3 (en)–S 2 O 3 2− systems. This study provided experimental reference for the recovery of Au(I) from thiosulfate solution. Graphical Abstract
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Inorganic Chemistry Frontiers
·
2024
·Vol. 11
·期 20
·6919-6927
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IF 6.1
Hongshan Wang,Xueting Pan,Shilie Pan,Junjie Li
Rare-earth (RE) compounds show wide applications in advanced photoelectric functional materials. Herein, by introducing [AgS3] trihedral and [NaQ6] (Q = S, Se) octahedral units into the AIREIIICIVQVI4 family for the first time, four new RE-based chalcogenides AIREIIISiQVI4 (AI = Ag, Na; REIII = La, Y; QVI = S, Se) were designed and successfully synthesized. With the increase of atomic radius from Ag, Li, Na, K, to Rb and Cs, the compounds show evident structural transitions from Ama2 (LiLaSiS4), P21/c (AgLaSiS4, NaLaSiS4), and P21 (KLaSiS4) to Pnma (RbLaSiS4, CsLaSiS4), highlighting that chemical modulations including atomic radius, coordination and bond length co-affected the structure transition. The title compounds exhibit wide band gaps (3.33 and 3.18 eV for AgLaSiS4 and AgYSiS4; 3.83 and 3.02 eV (HSE06) for NaLaSiS4 and NaLaSiSe4, respectively) that are higher than the Ag- and RE-based chalcogenides, as well as strong optical anisotropies (Δncal = 0.114–0.160@1064 nm). The theoretical calculations confirm the charge transfer enhanced band gap mechanism in the compounds and demonstrate that the layer distance influenced birefringence. The results enrich the chemical and structural diversity of RE compounds in the AIREIIICIVQVI4 family and give new insights into the design of new RE-based compounds with wide band gaps and large birefringence.
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CERAMICS INTERNATIONAL
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2024
·
IF 5.1
Liangliang Tang,Dongxu Yao,Yongfeng Xia,Jun Zhao,Ming Zhu,Yu-Ping Zeng
Gas-pressure-sintered silicon nitride (Si 3 N 4 ) ceramics were increased in density and mechanical properties without impairing the thermal conductivity by the addition of TiH 2 . After annealing treatment of the sintered ceramics, the inherent properties were further improved, the grain boundary phases on the surface were evaporated, and the rugged surface microstructure was formed. Si 3 N 4 ceramics before and after the annealing treatment were then joined with oxygen-free copper (OFC) foil using Ag-Cu-TiH 2 filler. Two interfacial structures, planar and rugged, were formed in the Si 3 N 4 ceramic/OFC foil joints, respectively. The peeling strength of the joints brazed with annealed Si 3 N 4 ceramics was improved, attributed to the increased inherent strength of the ceramics and rugged interface of the joints. The joint reached a maximum peeling strength of 25.08 N/mm, in which the fracture occurred mainly in the surface layer of the Si 3 N 4 ceramic as well as between the brazing alloy and the OFC foil.
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Applied Physics Reviews
·
2024
·Vol. 11
·期 2
·
IF 11.9
Mao Qian,Zhu Rong
Since tactile sensing provides rich and delicate sensations, touch-based object recognition has attracted public attention and has been extensively developed for robots. However, robotic grasping recognition in real-life scenarios is highly challenging due to the complexity of real-life objects in shapes, sizes, and other details, as well as the uncertainty of real grabs in orientations and locations. Here, we propose a novel robotic tactile sensing method, utilizing the spatiotemporal sensing of multimodal tactile sensors acquired during hand grasping to simultaneously perceive multi-attributes of the grasped object, including thermal conductivity, thermal diffusivity, surface roughness, contact pressure, and temperature. Multimodal perception of thermal attributes (thermal conductivity, diffusivity, and temperature) and mechanical attributes (roughness and contact pressure) greatly enhance the robotic ability to recognize objects. To further overcome the complexity and uncertainty in real-life grasping recognition, inspired by human logical reasoning “from easy to hard” in solving puzzles, we propose a novel cascade classifier using multilayered long short-term memory neural networks to hierarchically identify objects according to their features. With the enhanced multimodal perception ability of tactile sensors and the novel cascade classifier, the robotic grasping recognition achieves a high recognition accuracy of 98.85% in discriminating diverse garbage objects, showing excellent generalizability. The proposed spatiotemporal tactile sensing with logical reasoning strategy overcomes the difficulty of robotic object recognition in complex real-life scenes and facilitates its practical applications in our daily lives.
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JOURNAL OF ENVIRONMENTAL MANAGEMENT
·
2025
·
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
·
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
·
2024
·
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
·
2024
·
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
·
2024
·
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
·
2024
·
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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