ULTRASONICS SONOCHEMISTRY
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2017
·
IF 4.218
Xiaoming Luo,Juhang Cao,Haoran Yin,Haipeng Yan,Limin He
Droplets banding is critical to emulsion separation under ultrasonic irradiation as it can greatly improve the separation efficiency. In this paper, the formation process of droplets banding under ultrasonic standing waves was precisely captured by high-speed microscopic photography; by processing the images, the droplets banding characteristics, including the banding formation time and banding interval, were extracted. Then the effects of acoustic intensity, frequency, droplet size, and physical properties of oil and water on the droplets banding characteristics were discussed in details. The results show that the range of acoustic intensities, within which the droplets banding can form, increases with the increase of the frequency; a maximum allowable acoustic intensity exists for banding formation, which also increases with the frequency. The banding formation time, which increases with increasing oil viscosity but decreases with droplet size, is found to be hardly affected by the oil-water interfacial tension. In addition, the banding interval is only related to the frequency, which closely corresponds to the half wavelength.
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PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY
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2025
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IF 4
Tengfei Liu,Jianguo Niu,Yuying Gao,Xuan Liu,Jianya Su
Flonicamid is an insecticide with a unique mode of action, primarily inhibiting the feeding behavior of sap-sucking insects. However, its molecular target remains controversial. Reports indicate that both flonicamid and pymetrozine affect insect behavior and mobility. To investigate further, we compared the susceptibility of three insect species ( Myzus persicae , Nilaparvata lugens , and Drosophila melanogaster ) to flonicamid and pymetrozine under two different feeding postures. Results showed that feeding posture did not affect the survival curves or mean lifespans of the three insects. However, insect lifespans were significantly reduced under exposure to either insecticide compared to untreated controls. The effects of the two insecticides on susceptibility and lifespan under different feeding postures were markedly different: feeding posture significantly influenced the sensitivity of aphids, planthoppers, and fruit flies to pymetrozine but had minimal effects on the sensitivity of aphids and planthoppers to flonicamid. Flonicamid had only a minor impact on fruit flies' sensitivity. Survival curve analysis also revealed significant differences under pymetrozine stress, while no such differences were observed under flonicamid stress. These findings indicate that flonicamid exerts different toxicological effects on target insects (aphids and planthoppers) versus non-target insects (fruit flies), depending on feeding posture. This suggests that the toxicological mechanisms of flonicamid differ substantially between target and non-target organisms, with implications that findings in non-target insects may not directly apply to target pests. Our study provides valuable insights and directions for further research into flonicamid's mode of action, aiding in elucidating its underlying mechanisms.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
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2015
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IF 2.912
Hua Xu,Xiupei Yang,Gu Li,Chuan Zhao,Xiangjun Liao
A simple, economical, and green method for the preparation of water-soluble, high-fluorescent carbon quantum dots (C-dots) has been developed via hydrothermal process using aloe as a carbon source. The synthesized C-dots were characterized by atomic force microscope (AFM), transmission electron microscopy (TEM), fluorescence spectrophotometer, UV–vis absorption spectra as well as Fourier transform infrared spectroscopy (FTIR). The results reveal that the as-prepared C-dots were spherical shape with an average diameter of 5 nm and emit bright yellow photoluminescence (PL) with a quantum yield of approximately 10.37%. The surface of the C-dots was rich in hydroxyl groups and presented various merits including high fluorescent quantum yield, excellent photostability, low toxicity and satisfactory solubility. Additionally, we found that one of the widely used synthetic food colorants, tartrazine, could result in a strong fluorescence quenching of the C-dots through a static quenching process. The decrease of fluorescence intensity made it possible to determine tartrazine in the linear range extending from 0.25 to 32.50 μM, This observation was further successfully applied for the determination of tartrazine in food samples collected from local markets, suggesting its great potential toward food routine analysis. Results from our study may shed light on the production of fluorescent and biocompatible nanocarbons due to our simple and environmental benign strategy to synthesize C-dots in which aloe was used as a carbon source.
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Environmental Science-Water Research & Technology
·
2024
·Vol. 10
·期 8
·1871-1880
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IF 3.5
Yujie Zang,Linlin Yan,Tieying Yang,Kai Wang,Yingjie Zhang,Enrico Drioli,Jun Ma,Yonggang Li,Shanshan Ji,Xiquan Cheng
Membrane separation technology has been recognized as an effective approach to remove dyes from dyeing wastewater that are crucial for improving the quality of the pigmentation effect in the printing and dyeing industry. However, the trade-off between membrane permeability and selectivity is an inherent drawback of molecular separation membranes, which hampers the development of large-scale applications of the membrane separation process. In this work, we provide a facile approach to construct a highly selective polyamide (PA) layer on a ceramic membrane through the interfacial polymerization of branched polyethylenimine (PEI) and trimesoyl chloride (TMC) for the selective separation of dyes and salts from wastewater. With high positive surface zeta-potential (100 mV) and excellent hydrophilicity, the PA/ceramic composite membranes exhibit ultra-high solution permeance (496.4 L m−2 h−1 bar−1) while treating simulated dye/salt aqueous solutions containing 40 ppm Congo red (CR) and 1 g L−1 NaCl, which is 30 times higher compared with commercial polyamide nanofiltration membranes. Interestingly, the separation factor of NaCl to CR of the PA/ceramic composite membranes reaches above 980, which is far superior to the state-of-the-art nanofiltration membranes reported recently. Moreover, PA/ceramic membranes possess a relatively ideal long-term stability, with their permeance remaining at 280 L m−2 h−1 bar−1 after 10 h of testing. Taken together, the PA/ceramic composite membranes are highly promising for dye desalination and purification.
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JOURNAL OF CHROMATOGRAPHY A
·
2016
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IF 3.926
Yuan-Liang Hu,Zeng-Ping Chen,Yao Chen,Cai-Xia Shi,Ru-Qin Yu
In this contribution, a multiplicative effects model for generalized multiple-internal-standard method (MEM GMIS ) was proposed to solve the signal instability problem of LC–MS over time. MEM GMIS model seamlessly integrates the multiple-internal-standard strategy with multivariate calibration method, and takes full use of all the information carried by multiple internal standards during the quantification of target analytes. Unlike the existing methods based on multiple internal standards, MEM GMIS does not require selecting an optimal internal standard for the quantification of a specific analyte from multiple internal standards used. MEM GMIS was applied to a proof-of-concept model system: the simultaneous quantitative analysis of five edible artificial colorants in two kinds of cocktail drinks. Experimental results demonstrated that MEM GMIS models established on LC–MS data of calibration samples prepared with ultrapure water could provide quite satisfactory concentration predictions for colorants in cocktail samples from their LC–MS data measured 10 days after the LC–MS analysis of the calibration samples. The average relative prediction errors of MEM GMIS models did not exceed 6.0%, considerably better than the corresponding values of commonly used univariate calibration models combined with multiple internal standards. The advantages of good performance and simple implementation render MEM GMIS model a promising alternative tool in quantitative LC–MS assays.
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JOURNAL OF POLYMER SCIENCE PART B-POLYMER PHYSICS
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2017
·Vol. 55
·期 11
·856-865
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IF 2.838
Guanzhe Xu,Yan Xiao,Liang Cheng,Runhua Zhou,Heng Xu,Yimin Chai,Meidong Lang
Deferoxamine grafted alginate (SA-DFA) was successfully synthesized via amidation of sodium alginate with deferoxamine mesylate as determined by H-NMR and elemental analysis. SA-DFA with different graft yield was obtained by adjusting the ratio of sodium alginate and deferoxamine mesylate. It was found that aqueous solution of SA-DFA could form hydrogel spontaneously due to hydrogen bonding interactions, which also endowed the SA-DFA hydrogel with self-healing capability. The healing efficiency of SA-DFA hydrogels ranged from 53.64 to 90.16%. In addition, surface morphologies of SA-DFA hydrogels before/after self-healing process were demonstrated by SEM images. We anticipated that such self-healable alginate hydrogel would be applied in the field of wound healing. © 2017 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2017 , 55 , 856–865
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Analytical Methods
·
2017
·Vol. 9
·期 18
·2703-2709
·
IF 1.9
Biao Ma,Song-Fang Xie,Lei Liu,Fang Fang,Zhi-Yong Wu
A crucial challenge in development of robust paper-based analytical devices (PADs) is the lack of sensitivity. Electrokinetic stacking is a kind of unique sample preconcentration for low-abundant charged species, which can be integrated to PADs to enhance the sensitivity. In this work, we bring new insights into the mechanism underlying an electrokinetic stacking technique based on a field amplified stacking (FAS) effect implemented on a simple paper fluidic channel. Here, we reveal that the acid–base titration reaction between the cations/anions in the background electrolyte (BGE) and the OH−/H+ ions from water electrolysis plays an essential role in the development of the electric field gradient. This was experimentally confirmed by changing the BGE type, monitoring the current variation and pH characterization. Based on the new knowledge, the paper-based FAS was successfully extended to stack cationic analytes. Eventually, a model protein of bovine hemoglobin (BHb) in its anion form was 150-fold stacked within 60 s. This work shows that the sensitivity of PADs can be greatly enhanced with effective use of this simple and low cost electrokinetic stacking technique.
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Chemical Science
·
2016
·Vol. 7
·期 11
·6715-6720
·
IF 9.144
Xiaoxia Le,Wei Lu,Jing Zheng,Dingyi Tong,Ning Zhao,Chunxin Ma,He Xiao,Jiawei Zhang,Youju Huang,Tao Chen
Shape memory polymers based on reversible supramolecular interactions have invoked growing research interest, but still suffer from limitations such as poor mechanical strength and finite shape memory performance. Here, we present a novel mechanical stretchable supramolecular hydrogel with a triple shape memory effect at the macro/micro scale. The introduction of a double network concept into supramolecular shape memory hydrogels endows them with excellent mechanical properties. The design of two non-interfering supramolecular interaction systems of both dynamic phenylboronic (PBA)–diol ester bonds and the chelation of alginate with Ca2+ endues the hydrogel with outstanding triple shape memory functionalities.
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JOURNAL OF MEMBRANE SCIENCE
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2017
·
IF 6.035
Xiquan Cheng,Shangang Ding,Jiang Guo,Cong Zhang,Zhanhu Guo,Lu Shao
The separation of active organic molecules is the most challenging in pharmaceutical and petrochemical industries due to the intensive energy consumption of traditional distillation and the deactivation of active molecules during phase transition. Although the organic solvent nanofiltration (OSN) with nanoscaled molecular-separation ability is increasingly attractive for active organic molecule separations, the relatively low solvent permeance precludes OSNs from wide applications. Herein, we developed a kind of advanced mixed matrix membranes (MMMs) with both high permeances and high rejection by incorporating TiO 2 into polypyrrole (PPy) selective layer through in-situ hydrolysis of Ti(OC 4 H 9 ) 4 precursor on the surface of moisturized substrates. Owing to the uniform dispersion of in-situ formed TiO 2 nanoparticles , positive tuning effects of Ti(OC 4 H 9 ) 4 hydrolysis on PPy polymerization and structural characteristics of the hybrid selective layer, the in-situ TiO 2 incorporated PPy MMMs demonstrate both high ethanol permeances as 16.2 L m −2 h −1 bar −1 and high brilliant blue rejection (MW=792.85 g mol −1 ) as 92%. Most importantly, the advanced membrane also demonstrates the ethanol permeance over 8.0 L m −2 h −1 bar −1 during the long-term running test which is even higher than the initial permeances of many organic solvent nanofiltration membranes with similar rejection and high stability.
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RSC Advances
·
2017
·Vol. 7
·期 7
·4011-4016
·
IF 3.108
Zhi-Yong Wu,Biao Ma,Song-Fang Xie,Kun Liu,Fang Fang
In this report, we introduced an electrokinetic strategy for simultaneous concentration and separation of charged analytes in an open and free standing paper fluidic channel. This was achieved by taking advantage of the field amplified sample stacking (FASS) effect. An electric field gradient was developed in the channel due to the conductivity difference between the background electrolyte (BGE) and sample solution. Through adjustment of the electroosmotic flow level and BGE concentration, charged analytes were not only stacked but also separated in the gradient based on their difference in electrophoretic mobility. Proof of concept was demonstrated firstly by two food dyes, brilliant blue and amaranth, and each dye was about 100-fold concentrated within 300 s. Simultaneous stacking and separation of two colored proteins, bovine hemoglobin and cytochrome c, was also demonstrated visually with the proposed method. Sample consumption was reduced to 5 μL by directly loading the sample onto the open channel, and the separation was completed within 30 s. This method is simple, rapid and easy to operate, which is particularly beneficial to the development of sensitive and multifunctional paper-based analytical devices (PADs) for field testing.
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ACS Nano
·
2017
·
IF 13.942
Yi Wu,Shuxue Zhou,Bo You,Limin Wu
Hydro- and oleophobic (namely, omniphobic) coatings or surfaces have many important applications, but tremendous challenges in fabrication aspects still remain. Herein, we report a bioinspired design and nanofabrication of three-dimensional (3D) tribrachia-post arrays with re-entrant geometry (3D TPARG) for superhydrophobic and oleophobic polymer films or surfaces. By simply controlling the temperatures and time to treat silica colloidal templates, we can readily fabricate 3D ordered polymer arrays of tribrachia-posts or hexagonal tribrachia-posts with re-entrant geometries that resemble the skin of a springtail insect after the template is removed. These polymer surfaces exhibit excellent and self-healing superhydrophobicity and oleophobicity even against temperature, acids, alkalis, and mechanical damage. Moreover, their liquid-infused nanostructured surfaces still display very good liquid-sliding ability for water and oils. Our 3D TPARG design strategy may help the development of omniphobic polymer coatings or surfaces for practical applications in self-cleaning surfaces, liquid transport, antifouling materials, and many other important fields.
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BIOMACROMOLECULES
·
2015
·
IF 5.75
Guifei Li,Jie Wu,Bo Wang,Shifeng Yan,Kunxi Zhang,Jianxun Ding,Jingbo Yin
Self-healing polymeric hydrogels have the capability to recover their structures and functionalities upon injury, which are extremely attractive in emerging biomedical applications. This research reports a new kind of self-healing polypeptide hydrogels based on self-assembly between cholesterol (Chol)-modified triblock poly(l-glutamic acid)-block-poly(ethylene glycol)-block-poly(l-glutamic acid) ((PLGA-b-PEG-b-PLGA)-g-Chol) and β-cyclodextrin (β-CD)-modified poly(l-glutamic acid) (PLGA-g-β-CD). The hydrogel formation relied on the host and guest linkage between β-CD and Chol. This study demonstrates the influences of polymer concentration and β-CD/Chol molar ratio on viscoelastic behavior of the hydrogels. The results showed that storage modulus was highest at polymer concentration of 15% w/v and β-CD/Chol molar ratio of 1:1. The effect of the PLGA molecular weight in (PLGA-b-PEG-b-PLGA)-g-Chol on viscoelastic behavior, mechanical properties and in vitro degradation of the supramolecular hydrogels was also studied. The hydrogels showed outstanding self-healing capability and good cytocompatibility. The multilayer structure was constructed using hydrogels with self-healing ability. The developed hydrogels provide a fascinating glimpse for the applications in tissue engineering.
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