BMC Chemistry
·
2023
·Vol. 17
·期 1
·1-9
·
IF 4.6
Jing Xianwu,Liu Youquan,Zhao Wanwei,Pu Junhong
Different from common hydrophobic associative polymers, a new hydrophobic associative polyacrylamide (HAPAM) with ultra-long side chains was synthesized and aimed to be used as drag reducer in this work. Firstly, a water-soluble hydrophobic monomer (named AT114) was obtained by alcoholysis reaction with acryloyl chloride and triton 114, then the drag reducer was obtained by radical copolymerization of AM, AMPS and AT114. The structures of AT114 and drag reducer were characterized by IR and NMR. Slick water was obtained by dissolving a small amount drag reducer in water. Although the viscosity of slick water varied greatly in fresh water and brine, the drag reduction rate always remained at a high level when flowing in pipelines. When the concentration of the drag reducer was 0.03% in fresh water, drag reduction rate can be up to 76.7%, while in high concentration brine, still as high as 76.2%. It shows that salt has no obvious negative impact on the drag reduction rate. That is also to say, in the case of low viscosity, the viscosity change has no obvious impact on drag reduction rate. From the Cryo-TEM observation, it can be concluded that the drag reducer forms sparse network structures in water, which is the direct reason for drag reducing effect. This finding provides knowledge regarding the development of new drag reducers.
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Nano Research
·
2023
·Vol. 16
·期 8
·10810-10821
·
IF 9.9
Ren Jinhong,Liu Jie,Du Yunmei,Li Shuangshuang,Wang Mengmeng,Li Bin,Yang Bo,Wang Lei,Liu Yanru
At present, Ru dopants mainly enhance electrocatalytic performance by inducing strain, vacancy, local electron difference, and synergy. Surprisingly, this work innovatively proposes that trace Ru atoms induce dual-reconstruction of phosphide by regulating the electronic configuration and proportion of Co-P/Co-O species, and ultimately activate superb electrocatalytic performance. Specifically, Ru-CoFeP@C/nickel foam (NF) is reconstructed to generate hydrophilic Co(OH) 2 nanosheets during the hydrogen evolution reaction (HER) process, further accelerating the alkaline HER kinetics of phosphide. And the as-formed CoOOH during the oxygen evolution reaction (OER) process directly accelerates the oxygen overflow efficiency. As expected, the overpotential at 100 mA·cm −2 ( η 100 ) values of the reconstructed Ru-CoFeP@C/NF are 0.104 and 0.257 V for HER and OER, which are greatly lower than that of Pt/C-NF and RuO 2 -NF benchmarks, respectively. This work provides guidance for the construction of high-performance catalysts for HER and OER dual reconstruction. This work provides a new idea for the optimization of catalyst structure and electrocatalytic performance.
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JOURNAL OF POLYMERS AND THE ENVIRONMENT
·
2023
·Vol. 31
·期 12
·5089-5098
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IF 5.3
Chen Shaowei,Liu Peng,Li Zhenchun,Tang Ning,Li Tianwei,Yu Yunwu,Li Feihong,Bi Yuanyuan
In this study, relying on different ratios of dopamine (DA) and polyvinylimide (PEI) as mussel coating materials, a new type of mussel-coated modified composite nanofiltration membrane was developed. The effects on membrane flux and retention of the step-by-step and one-step methods were compared. The results showed that the membrane performance was closely related to the different ratios of DA and PEI. When the ratio of DA:PEI was 3:1, the water flux and dye retention rate were the best, and the pollution recovery rate of humic acid reached 86.8%. By optimizing a simple one-step fabrication process, the performance of composite nanofiltration membranes has been greatly improved. Compared with the membrane prepared by the step-by-step method, the pure water flux of the new composite membrane prepared by the one-step method increases by 19.8%, and the retention rate increases by 145.9%. This research will provide a simple, fast, and efficient preparation method for developing new high-performance composite nanofiltration membranes.
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Parasites & Vectors
·
2023
·Vol. 16
·期 1
·1-9
·
IF 3.2
Ma Xiaoxiao,Bai Xue,Li Hongchang,Ding Jing,Zhang Huiyuan,Qiu Yangyuan,Wang Jing,Liu Xiaolei,Liu Mingyuan,Tang Bin,Xu Ning
Background Fish-borne zoonotic clonorchiasis, caused by Clonorchis sinensis , is an emerging public health problem in several countries with more than 15 million people infected globally. However, a lack of accurate point-of-care (POC) diagnostic tests in resource-limited areas is still a critical barrier to effective treatment and control of clonorchiasis. The development of the recombinase polymerase amplification(RPA) assay, a POC diagnostic test based on the amplification of pathogen DNA, has provided a new, simple and inexpensive tool for disease detection with high sensitivity and specificity. Methods A novel RPA method was developed based on specific primers and probes, and combined with the dipstick, to allow for the rapid and intuitive detection of C. sinensis through the amplification of the mitochondrial cytochrome c oxidase subunit 1 ( COX1 ) gene. The lower limit of detection for the combined RPA/lateral flow dipstick (RPA-LFD) assay was evaluated using dilutions of the target DNA sequence. Cross-reactivity was evaluated using genomic DNA from 10 additional control parasites. Forty human clinical stool samples were tested to verify its performance. Results The evaluated primers designed from the C. sinensis COX1 region can be used to detect adult worms, metacercariae, and eggs at 39 °C within 20 min, and the results can be visually observed using the LFD. The detection limit of pathogen genomic DNA was as low as 10 fg, and the number of metacercaria(e) in fish and egg(s) in faeces were both as low as one. This improved the sensitivity of low-infection detection tremendously. The test is species-specific, and no other related control parasites were detected. In human stool samples with eggs per gram (EPG) > 50, the RPA-LFD assay was performed consistent with conventional Kato-Katz (KK) and PCR methods. Conclusion The established RPA-LFD assay provides a powerful tool for the diagnosis and epidemiological survey of C. sinensis from human and animal samples, and has important implications for the effective control of clonorchiasis. Graphical Abstract
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-11
·
IF 16.6
Wang Xiaoning,Tong Yanfu,Feng Wenting,Liu Pengyun,Li Xuejin,Cui Yongpeng,Cai Tonghui,Zhao Lianming,Xue Qingzhong,Yan Zifeng,Yuan Xun,Xing Wei
Designing Pt-based electrocatalysts with high catalytic activity and CO tolerance is challenging but extremely desirable for alkaline hydrogen oxidation reaction. Herein we report the design of a series of single-atom lanthanide (La, Ce, Pr, Nd, and Lu)-embedded ultrasmall Pt nanoclusters for efficient alkaline hydrogen electro-oxidation catalysis based on vapor filling and spatially confined reduction/growth of metal species. Mechanism studies reveal that oxophilic single-atom lanthanide species in Pt nanoclusters can serve as the Lewis acid site for selective OH - adsorption and regulate the binding strength of intermediates on Pt sites, which promotes the kinetics of hydrogen oxidation and CO oxidation by accelerating the combination of OH − and *H/*CO in kinetics and thermodynamics, endowing the electrocatalyst with up to 14.3-times higher mass activity than commercial Pt/C and enhanced CO tolerance. This work may shed light on the design of metal nanocluster-based electrocatalysts for energy conversion.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 16
·1-14
·
IF 2.8
Wu Di,Weng Ling,Zhang Xiaorui,Guan Lizhu,Wu Zijian
In recent years, wearable devices have developed rapidly. With its excellent performance, flexible piezoresistive sensors are widely used in human health monitoring, motion monitoring, artificial intelligence and wearable electronic devices. In this paper, a wearable flexible multilayer piezoresistive sensor based on mulberry silk fabric is designed. During the preparation of the flexible piezoresistive sensor, polydopamine (PDA), silver nanoparticles (AgNPs), MXene and polypyrrole (PPy) were coated on the surface of the mulberry silk fabric layer-by-layer, and then five layers of conductive fabric were stacked together, using 3M tape, PDMS resin and flexible wire for encapsulating. A wearable flexible multilayer piezoresistive sensor based on mulberry silk fabric is obtained. After testing, several substances have been successfully loaded onto the surface of mulberry silk fabric, and the effect of coating fabric is ideal. Furthermore the sensor shows excellent performance such as sensitivity of 2.0510 under low strain, sensitivity of 1.1171 under high strain and cycle stability of 1000 times, which is superior to the previously reported sensor based on fabric, and has broad application prospects.
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FIBERS AND POLYMERS
·
2023
·Vol. 24
·期 6
·1951-1961
·
IF 2.5
Shi Shengnan,Feng Shuangjiang,Liu Chenghuan,He Man,Bu Xiaohai,Zhang Zewu,Zhou Yuming,Yao Qingzhao
Passive radiant cooling (PRC) technology has an irreplaceable position in building cooling and energy conservation due to sustainable and environmental friendly without energy consumption. However, the lack of consideration for building security in extreme weather conditions, especially in hot and overheated conditions, which propose a requirements for synergistic design of fire resistance and optical selectivity of materials. Herein, this work propose to introduce the compound (PAC) originated from phytic acid (PA) and cytosine (C) and the LDH nanosheets modified by ammonium polyphosphate (APP) into porous cellulose acetate (CA) film to obtain synergistically functionalized 2D/3D cellulose LDH photonic films (CPA films). The presence of substantial amounts of P elements effectively enhances the fire resistance of films, so that it burns without an open flame and with excellent self-extinguishing. Furthermore, the P=O and P−O in APP and PAC endows CPA films with outstanding atmospheric window emissivity via selective absorption, whose infrared emissivity is 93.68%. Meanwhile, the modified dispersive LDH increases solar radiation reflectivity to 96.15%. As a verification, building models covered with films are constructed, cooling of 6℃ be achieved and average energy saving efficiency is 22.8% through shading roof merely. Looking forward to the future, the CPA films will get a comprehensive application in buildings, 5G communication base stations, spacecraft and all equipment exposed to solar. Graphical abstract
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IRANIAN POLYMER JOURNAL
·
2023
·Vol. 32
·期 8
·1065-1074
·
IF 3.1
Yuan Xu,Xianwu Jing,Yongfan Tang,Lang Zhou,pengfei Zhang
A very simple cationic monomer and a cationic hydrophobically associating polyacrylamide were synthesized, and the polymer was to function as a drag reducer. The structures of monomer and polymer were characterized by IR and NMR, and the drag-reducing rate, below and above the critical association concentration, (CAC) was tested. The modified polyacrylamide is a typical hydrophobically associating polymer, reaching a CAC at a mass concentration of about 0.25% (by weight). It is found from the friction test that the optimum concentration of the drag reducer is about 0.05% in fresh water, and the highest drag-reducing rate reaches as high as 72%. In addition, high concentration and high viscosity of drag reducer may impart negative impact on drag reduction rate in fresh water. While in brine, the optimum concentration is about 0.1%, and the highest drag-reducing rate is 68.4%. A high concentration has little negative impact on drag reduction rate, because viscosity is always very low. From the SEM images, it can be seen that the polymer can form network structure in fresh water. Above the CAC concentration, the network structure is significantly denser than that below the CAC concentration, but this is not conducive to the drag-reducing rate. In practical application, we always recommend using concentrations below CAC. Graphical Abstract
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2023
·Vol. 30
·期 35
·84002-84010
·
IF 5.8
Yang Zhenhua,Yang Xintong,Zhang Yuexia,Fan Xiaopeng,Cao Yujuan,Li Zhongping,Dong Chuan
Amphiphilic blue-fluorescence carbon dots (B-CDs) were synthesized via pyrolysis method with citric acid and oleamine as precursors. B-CDs are monodispersed in ethanol, toluene, and ultrapure water with the average particle sizes of 3.33 nm, 2.05 nm, and 4.12 nm, respectively. The maximum emission wavelength of the B-CDs excitation at 370 nm is located at 459 nm. The B-CDs have good optical properties with excellent photostability. The fluorescence quantum yield (QY) of the as-prepared CDs is as high as 30.17%. The fluorescence of B-CDs is quenched because of static quenching by oxytetracycline. A high selective and sensitive fluorescence probe for detecting oxytetracycline was constructed with a linear range of 1.52–27.60 µg/mL and the detection limit of 0.33 µg/mL. The B-CDs-based fluorescence probe can be applied to analyze oxytetracycline in milk; the recoveries and relative standard are satisfactory. Furthermore, the B-CDs were exploited for imaging of SH-SY5Y cells. The results demonstrate that as-synthesized CDs can serve as a cellular imaging reagent owing to remarkable bioimaging performance. This work provides a new strategy for the detection of oxytetracycline in food.
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npj Clean Water
·
2023
·Vol. 6
·期 1
·1-11
·
IF 11.4
Li Chao,Li Jiale,Huang Niu,Kong Xin Ying,Xiao Qingyi,Huang Yingping,Wong Po Keung,Ye Liqun
Advanced oxidation technology based on peroxonosulfate (PMS) has attracted extensive attention in water treatment research due to its fast reaction speed and wide pH range adaptability. Cobalt-based catalysts are considered to be one of the most effective reagents for PMS activation in various PMS activation methods. However, Co-ion leaching and difficulty in recovery have greatly hindered its practical applications. Herein, we developed a robust membrane constructed by nitrogen-doped carbon nanotubes embedded with cobalt nanoparticles (Co-NC) to concurrently address the Co-ion leaching and recovery issues. Based on our customization, continuous water flow reactor, the Co-NC membrane exhibited excellent catalytic activity and stability, in which it demonstrated a remarkable sterilization efficiency of 99.9999% against E. coli , and it retained a superior stability of 96.29% after 40 repeated cycles. Fewer attempts to put such efficient heterogeneous advanced oxidation processes (AOPs) into practical application, to mimic real-life applications, the performance of the Co-NC/PMS system was extended to the water taken from Qiuxi River. Remarkably, there is no deterioration in performance over 12 h of continuous real sewage processing. Mechanistic studies revealed that abundant high-valence metals (Co IV =O) were generated in the system, which can attack and penetrate into the cell membrane to destroy its intracellular defense system. This work provides useful insights into designing robust membranes with superior efficiency and stability for PMS-based advanced oxidation technology.
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Nature Communications
·
2023
·Vol. 14
·期 1
·1-11
·
IF 16.6
Chen Yuan,Zheng Yangzezhi,Zhou Yang,Zhang Wei,Li Weihuan,She Wei,Liu Jiaping,Miao Changwen
The inherent quasi-brittleness of cement-based materials, due to the disorder of their hydration products and pore structures, present significant challenges for directional matrix toughening. In this work, a rigid layered skeleton of cement slurry was prepared using a simplified ice-template method, and subsequently flexible polyvinyl alcohol hydrogel was introduced into the unidirectional pores between neighboring cement platelets, resulting in the formation of a multi-layered cement-based composite. A toughness improvement of over 175 times is achieved by the implantation of such hard-soft alternatively layered microstructure. The toughening mechanism is the stretching of hydrogels at the nano-scale and deflections of micro-cracks at the interfaces, which avoid stress concentration and dissipate huge energy. Furthermore, this cement-hydrogel composite also exhibits a low thermal conductivity (around 1/10 of normal cement) and density, high specific strength and self-healing properties, which can be used in thermal insulation, seismic high-rise buildings and long-span bridges.
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JOURNAL OF SOILS AND SEDIMENTS
·
2023
·Vol. 23
·期 8
·3006-3017
·
IF 3.6
Dong Yibo,Liu Xudong,Wu Xiaomao
Purpose In this study, the adsorption behavior of diuron in a typical black soil and its bioavailability to crops and earthworms were investigated by adsorption and incubation experiments, combined with biochar amendment and aging time. Methods In this study, the adsorption of diuron, and its uptake by corn and earthworms were investigated in black soil with 0.1–5% (w/w) bamboo charcoal. Results Uptake of diuron by corns was reduced by 45% in black soil aged for 0 day in 0.1–5% biochar-amended soil, the concentration of diuron in both roots and stems of corn plants tended to decrease with the increase of aging time, and the enrichment coefficient of diuron in corn also tended to decrease in 0.1–5% biochar-amended soil. When aging time was 0 day and the biochar amendment in black soil was 0.1–5%, the accumulation concentration of diuron in earthworms decreased by 63%; the bioconcentration coefficient of diuron in earthworms in black soil with different levels of biochar decreased continuously with the increase of aging time. Conclusion Biochar is an efficient adsorbent for diuron and could significantly reduce the uptake of diuron by plants and earthworms from contaminated soil. Significant correlations indicated that regression analyses could be constructed between the bioconcentration factor and sorption coefficients to predict the bioavailability of diuron residues in soil to corns and earthworms. Biochar amendment could be used as an option to immobilize diuron in soil and protect non-target organisms from diuron contamination.
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