JOURNAL OF COLLOID AND INTERFACE SCIENCE
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2025
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IF 9.7
Kaizhou Huang,Jiajie Xu,Wei Qu,Tenghui Jin,Yi Yang,Xiao Liu,Rajasekhar Balasubramanian,J. Paul Chen
A hierarchically structured photocatalyst composite bead (CS-PG 0.5% -Fe) was developed in this study through a synergistic electronic modulation strategy, incorporating porphyrin-tailored polymeric carbon nitride (C 3 N 4 por), Fe(III) coordination, and polyethylenimine(PEI)-alginate cross-linked matrix to overcome challenges in Fenton-like wastewater treatment. The multi-component architecture was constructed via triple cross-linking treatment, with comprehensive mechanistic analysis employing in-situ characterization, reactive species tracking, and theoretical calculations to reveal the photo-driven H 2 O 2 self-supply and activation processes. PEI acted as an electron pump and proton-relay mediator to enhance C 3 N 4 charge separation, while the cross-linked structure enabled spatially the confined H 2 O 2 activation. With 0.5 % PEI crosslinking identified as the optimal condition in the material fabrication, the composite achieved an exceptionally high H 2 O 2 production rate and rapid atrazine degradation ( k = 0.0234 min −1 ), and efficient Fe 2+ /Fe 3+ cycling with 96.05 % stability after four consecutive cycles. This study demonstrates an effective approach to simultaneously regulate charge separation and reaction pathways in photocatalytic-Fenton-like systems, offering a scalable solution for energy-autonomous water purification with reduced chemical inputs and recyclable catalytic components.
研究领域:
环境科学
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材料科学
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化学工程
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产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry C
·
2019
·Vol. 7
·期 8
·2299-2304
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IF 6.641
Yutong Guo,Danchen Wang,Jieai Li,Yunyu Sun,Mingtong Li,Hui Zhang,Ruomeng Duan,Dafeng Zhang,Bo Song,Bin Dong
Micropumps, especially those based on polymers, have shown great potential in sensing and mass transportation applications. However, polymer-based micropumps only exhibit a certain pumping direction, which is not adjustable, thus limiting their further applications. In this paper, a light-driven micropump with tunable pumping directions is reported. The direction control of this micropump relies on the photothermal effect of the polymeric component and the light-induced release of the encapsulated surfactant. Both on–off, inward and outward, or even the unique heartbeat-like pumping behaviors could be realized. The direction-controlled micropump has great potential for a variety of applications. Among others, it has the ability to rectify the fluid flow or accelerate the solution stirring.
研究领域:
材料科学
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生物医学工程
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产品关联
DOI
高影响因子
Micromachines
·
2022
·Vol. 13
·期 10
·1620
·
IF 3.523
Gang Guo,Xuanye Wu,Demeng Liu,Lingni Liao,Di Zhang,Yi Zhang,Tianjiao Mao,Yuhan He,Peng Huang,Wei Wang,Lin Su,Shuhua Wang,Qi Liu,Xingfeng Ma,Nan Shi,Yimin Guan
Currently, many microchips must rely on an external force (such as syringe pump, electro-hydrodynamic pump, and peristaltic pump, etc.) to control the solution in the microchannels, which probably adds manual operating errors, affects the accuracy of fluid manipulation, and enlarges the noise of signal. In addition, the reasonable integration of micropump and microchip remain the stumbling block for the commercialization of microfluidic technique. To solve those two problems, we designed and fabricated a thermal bubble micropump based on MEMS (micro-electro-mechanical systems) technique. Many parameters (voltage, pulse time, cycle delay time, etc.) affecting the performance of this micropump were explored in this work. The experimental results showed the flow rate of solution with the assistance of a micropump reached more than 15 μL/min in the optimal condition. Finally, a method about measuring total aflatoxin in Chinese herbs was successfully developed based on the integrated platform contained competitive immunoassay and our micropump-based microfluidics. Additionally, the limit of detection in quantifying total aflatoxin (AF) was 0.0615 pg/mL in this platform. The data indicate this combined technique of biochemical assays and micropump based microchip have huge potential in automatically, rapidly, and sensitively measuring other low concentration of biochemical samples with small volume.Keywords:thermal bubble micropump;microfluidics;competitive immunoassay;aflatoxin
研究领域:
微机电系统(MEMS)
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分析化学
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生物化学
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产品关联
DOI
PubMed
高影响因子
Materials Today Communications
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2021
·
IF 3.383
Gongguo Zhang,Mengfan Li,Hongwen Huang,Yiqun Zheng
We report a facile synthesis of cubic/cuboidic gold nanocrystals with tunable surface concavity via seeded growth. The key to the success of this work lies in the use of syringe pump to change the injection rate of the metal precursor and thus manipulation over atomic deposition versus surface diffusion . The formation mechanism and the morphology-dependent plasmonic properties, as well as electrochemical behavior are analyzed.
研究领域:
材料科学
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化学
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DOI
高影响因子
ANALYTICAL SCIENCES
·
2020
·Vol. 36
·期 8
·953-957
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IF 2.049
Tian Shumei,Zhang Wenli,Shi Jinwei,Guo Zixian,Li Ming
Nanochannel plastic membranes are excellent materials for electroosmotic pump (EOP) elements owing to their surface charge properties, flexibility and cost-effectiveness. However, the surface charge properties of plastics are inferior to those of silicate-based materials. This paper reports a performance-enhanced EOP equipped with a glassified track-etch polycarbonate membrane (PC), which has a nanochannel surface covered by allylhydridopolycarbosilane (AHPCS). The effects of applied voltage, pH and membrane pore size on the electroosmotic flow velocity, along with a comparative study of the EOP with coated and pure membranes were investigated. It was found that when low DC voltage (10 - 40 V) was applied to both ends of the pump, the magnitude of the electroosmotic flow was linearly proportional to the voltage when the pore size of the membrane was less than 600 nm. A higher flow rate was obtained with larger pore size membranes. Compared with the uncoated film, the coated one showed faster electroosmosis velocity, with higher stability under the same conditions. For pH 10.0 buffer solution, a flow rate of 89.13 μL/min was obtained in the modified membrane-based EOP with excellent repeatability and durability, while the flow rate was only 37.89 μL/min in the bare PC membrane under 20 V. In order to demonstrate the performance of the developed EOP, the EOP was used for microcomplexometric titration to determine actual tap water hardness. The measured results were highly consistent with the results of a conventional complexometric titration methed. The EOP with an AHPCS-coated plastic membrane expanded the application range to harsh condition solutions, such as high-concentration acids or bases.
研究领域:
材料科学
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分析化学
✓ 已验证
DOI
高影响因子
LAB ON A CHIP
·
2024
·Vol. 24
·期 4
·896-903
·
IF 6.1
Qian Li,Pan Zhang,Zi Ye,Huimin Zhang,Xiao Sun,Lin Gui
The application of liquid metal in a microfluidic system enables the fabrication of highly integrated on-chip electroosmotic micropumps (EOPs). In this work, a low-voltage driveable integrated parallel EOP cluster drive system is proposed. This system consists of two layers, a branch-channel layer and a trunk-channel layer. The lower branch-channel layer contains separate parallel pumping channels and a pair of comb liquid metal electrodes. The separated branch channels are connected together through the trunk channels in the upper layer. With this structural arrangement, the parallel micropumps form an integrated micropump cluster for larger pumping capacity. The distance between the pumping channel and the electrode next to it is controlled to 20 μm. To guide the pump design, parametric studies are performed and fully discussed. According to the experimental results, the micropump cluster can be driven at a low voltage of 0.5 V, and the flow rate reaches 274 nL min−1 at 5 V. In addition, the paper finally proposes an electrode protection strategy and an integrated pump-valve drive system which is expected to solve the shortcoming of electroosmotic pumps in terms of long-time storage and driving.
CAS / MDL:
研究领域:
微纳米技术
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生物医学工程
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产品关联
DOI
PubMed
高影响因子
Emerging Microbes & Infections
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2018
·
IF 6.032
Jin-xin Zheng,Zhi-wei Lin,Xiang Sun,Wei-hong Lin,Zhong Chen,Yang Wu,Guo-bin Qi,Qi-wen Deng,Di Qu,Zhi-jian Yu
This study investigated the characteristics and mechanisms of eravacycline resistance and heteroresistance in clinical Klebsiella pneumoniae isolates. A total of 393 clinical K. pneumoniae isolates were collected and subjected to eravacycline and tigecycline MIC determinations using the agar dilution method. Eravacycline heteroresistance was assessed by a population analysis profile (PAP). The expression levels of efflux pumps and their regulators were determined by quantitative reverse-transcription PCR (qRT-PCR). This study identified 67 eravacycline-nonsusceptible isolates; among the extended-spectrum β-lactamase (ESBL)-positive isolates, eravacycline-nonsusceptible isolates were detected more frequently than tigecycline-nonsusceptible isolates (21.7% vs. 9.4%, p = 0.001). The study sample was observed to include 20 K. pneumoniae isolates with eravacycline heteroresistance. Compared to the reference strain, oqxA or oqxB overexpression was observed in nine eravacycline-nonsusceptible isolates (range, 35.64–309.02-fold) and 13 eravacycline-heteroresistant isolates (8.42–296.34-fold). The overexpression of macA or macB was detected in 12 eravacycline-heteroresistant isolates (3.23–28.35-fold). Overexpression of the efflux pump regulator gene ramA was observed in 11 eravacycline-nonsusceptible isolates (3.33–94.05-fold) and 18 eravacycline-heteroresistant isolates (3.89–571.70-fold). The eravacycline MICs were increased by one–fourfold by overexpression of oqxAB or macAB in three eravacycline-sensitive isolates. In conclusion, the overexpression of OqxAB and MacAB efflux pumps and the transcriptional regulator RamA were suggested to be involved in K. pneumoniae eravacycline resistance and heteroresistance.
研究领域:
微生物学
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医学
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药理学
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产品关联
DOI
PubMed
高影响因子
RSC Advances
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2018
·Vol. 8
·期 64
·36910-36914
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IF 2.936
Long Xu,Yan Meng,Caixia Xu,Ping Chen
Solution-processed organic–inorganic halide lead perovskites have attracted increasing attention due to their great potential in low-cost, effective, and versatile light emission applications and large-scale portable optoelectronic devices. In this paper, formamidinium lead tribromide perovskite thin films composited with polyethylene oxide (PEO) were fabricated by a solution processing method. Great enhancement of photoluminescence was observed and more attractively, two-photon-pumped random lasing action could be achieved at room temperature when pumped by a nanosecond pulse laser with excitation wavelength centered at 1064 nm. Evident transition from spontaneous upconversion emission to random lasing action was investigated by monitoring the log–log light emission slope and peak width at half height. The lasing threshold is at around 1.1 mJ cm−2, which is comparable to that of other two-photon upconversion random lasers. The efficient random lasing emission originates from the multiple random scattering provided by the micrometer-scale rugged morphology and polycrystalline grain boundaries. Compared with conventional lasers that normally serve as a coherent light source, the perovskite random lasers show promise in fabricating low-cost thin-film lasing devices for flexible and speckle-free imaging applications.
研究领域:
材料科学
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光学工程
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产品关联
DOI
PubMed
高影响因子
Journal of Water Process Engineering
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2022
·
IF 7.34
Xiaohong Wang,Yonglei Wang,Liping Tian,Ling Ju,Ruibao Jia,Wuchang Song,Haiyang Yu,Jingjing Li
The eutrophication of reservoir water leads to the proliferation of algae, the DAF process can overcome the lack of algae removal capacity in conventional treatment processes, and its pollution removal efficiency is affected by the equipment performance. Among DAF equipment, multiphase flow pumps have attracted attention because of their simple configuration and low failure rate. This paper studied the equipment performance and pollution removal efficiency of a multiphase flow pump for DAF. The results showed that the dissolution efficiency of the equipment was approximately 55% and the average particle size of bubbles was less than 26 μm. When the pressure was greater than 0.36 MPa, the bubble stability time exceeded 4 min. The optimal working conditions were achieved at a dissolved gas pressure of 0.4 MPa. The maximum removal rates of turbidity , chlorophyll a , TOC, UV 254 and COD Mn by the DAF process were 56.49%, 50.23%, 23.73%, 28.75% and 23.98%, respectively. The trend in pollution removal efficiency was consistent with that of equipment performance parameters. The surface of the microbubbles was hydrophobic and could more easily adsorb high-molecular-weight organic substances with strong hydrophobicity and algae with strongly hydrophobic colloidal layers inside. In addition, regarding the THMFP, the experimental results showed that the removal rates of the precursors CHCl 3 , CHBrCl 2 and CHBr 2 Cl after DAF were 28.93%, 23.26% and 21.53%, respectively. Surface hydrophobicity is one of the main mechanisms by which microbubbles adhere to pollutants.
研究领域:
环境科学
·
水处理工程
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产品关联
DOI
高影响因子
Talanta Open
·
2024
·
IF 4.1
Mingtao Sun,Yiyu Jiang,Wenshan Liang,Hui Zeng,Huiwen Chen,Min Zhang
An affordable droplet-based flow analyzer incorporating peristaltic micro-pumps has been developed for fluorescent ammonium sensing. The cost-effective peristaltic micro-pumps, modified using 3D-printing techniques, feature a 3D-printed pump base integrated with a Hall sensor to monitor the rotation of the pump motor. This setup generates a pulse flow instead of a continuous flow, delivering specific volumes (typically between 3 to 4 μL) of solution with each rotation. By using separate pumps to deliver the aqueous and oil phases, these phases merge to form a droplet flowing stream. The relative standard deviation (RSD) values for droplet volumes range from 3.97 % to 5.99 % ( n =50) across different pumps. The analyzer utilizes a reaction between ammonium, ortho-phthalaldehyde, and sulfite to produce a fluorescent derivative, allowing for sensitive detection of low ammonium concentrations. A custom light-emitting diode (LED)-based fluorescence detector has been fabricated using 3D printing, ensuring cost-effective production. The analyzer provides a limit of detection of 0.02 μM (3 σ ) and an RSD of 0.15 % ( n =10, 1 μM ammonium). This analyzer offers several practical advantages, including reduced reagent consumption and the potential for further development in distributed on-site analysis. The use of 3D printing facilitates rapid prototyping and customization, making the system adaptable to various analytical applications.
研究领域:
分析化学
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环境科学
·
生物技术
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产品关联
DOI
高影响因子
CHEMOSPHERE
·
2024
·
IF 8.1
Ming Ruan,Huajing Zhou,Lingxiang Zhao,Tianding Hu,Liang He,Shaoyun Shan
It is feasible to improve the photodegradation efficiency of organic pollutants by metal-organic frameworks (MOF)-based semiconductors via ligand engineering. In this work, three (Fe/Co)-XBDC-based MOFs were synthesized by introducing different ortho-functional groups X (X = –H, –NO 2 , –NH 2 ) next to the carboxyl group of the organic ligand (i.e., terephthalic acid). The analysis focused on the influence mechanism of the adjacent functional group effect of the ligand on the physicochemical properties of the material and the actual photodegradation activity of TC . Multiple pieces of evidences suggested that the differences in electron-induced and photocharge-transfer mechanisms of the above ortho functional groups affect the crystal morphology and photocatalytic activity of FeCo-MOF during pyrolysis . Interestingly, (Fe/Co)–NH 2 BDC exhibited the highest photocatalytic activity under neutral conditions. The results of density functional theory show that the introduction of a strong donor-NH 2 group can enhance light absorption and act as an “electron pump” to supply electrons to the iron center, accelerating the separation and efficient transport of photogenerated carriers on the ligand-metal bridge. In conclusion, this study is a proposal for a strategy of structural regulation for the enhancement of the catalytic activity of (Fe/Co)-MOFs in the photodegradation of TC.
研究领域:
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
ANALYTICAL CHEMISTRY
·
2025
·
IF 6.7
Xin Qian,Lan Xia,Baian Ji,Yike Huang,Zhining Xia
To improve separation efficiency and address the adverse effects of electro-osmosis, a coated capillary was used to shield the electroosmosis. A nanoflow pump was used to control the flow of the electrophoretic medium, thereby extending the time of the electrophoretic action. Furthermore, by using a coated capillary that is only 10 cm long as the separation column, the electric field strength could reach as high as 250 V/mm. These strategies strengthened the interaction between the enantiomers and the chiral selector, thus enhancing the resolution of enantiomers. As a result, complete separation of the amlodipine enantiomers could be achieved by halting the electrophoretic medium. Further extending the duration of flow stoppage can increase the resolution several-fold. The method established in this study exhibits excellent accuracy and precision. Despite experiencing a long period of flow stoppage, the relative standard deviations of both migration time and resolution remain less than 2%. This method not only remarkably enhanced the resolution of amlodipine enantiomers but also demonstrated broad applicability in separating other chiral enantiomers, particularly for those substances that are difficult to separate using conventional capillary electrophoresis.
研究领域:
分析化学
·
药物分析
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生物化学
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产品关联
DOI
PubMed
高影响因子
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