CELLULOSE
·
2025
·
IF 4.8
Yao Qing,Zhang Bing,Jin Yongkang,Cai Zaisheng,Xu Bi
Developing fluorine-free, bio-based, and mechanically robust water repellent coating is attractive for the textile industry, yet remains challenging. In this work, we reported a bio-based urethane prepared in one step by utilizing the nucleophilic addition reaction between sorbitan tristearate and isophorone diisocyanate. The obtained urethane was subsequently emulsified and applied onto three types of fabrics including cotton, polyester pongee, and nylon taffeta through a simple dip-pad-cure process, to produce durable superhydrophobic coatings. Both the resulting cotton fabrics and polyester fabrics exhibit static water contact angles above 150° and a grade of 5 in the water spray test, while the nylon fabrics own a water contact angle of 147° and a grade of 4 in the water spray test. All the fabrics maintained excellent air permeability. Besides, the treated fabrics maintain hydrophobicity after harsh durability tests, including 3000 cycles of friction, 400 cycles of sandpaper abrasion, and 70 h of chemical corrosion. Overall, the findings presented in this study offer valuable insights into the development of non-fluorine durable bio-based water repellents, highlighting their potential for diverse industrial applications. Graphical abstract
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Journal of Food Measurement and Characterization
·
2025
·
IF 3.3
Liu Wangyu,Tan Zhenhua,Xie Weigui
With the continuous growth of tomato yields and the need to address the cumbersome task of manual harvesting, the development of harvesting robots presents a promising solution for tomato harvesting. A key challenge lies in improving the success rate of these robots for reliable tomato harvesting without causing damage. This study aims to propose a rigid-flexible coupled gripper to ensure higher success rates in tomato harvesting, while also incorporating an advanced method for detecting fruit ripeness. The paper introduces a flexible hydrogel pressure sensor, featuring a wide detection range, high sensitivity, and excellent stability, integrated into the gripper design. A signal acquisition system based on a sensor array is developed, enabling the accurate capture of force signals during the tomato grasping process. The sensor array collects tactile sequence data in real-time, which, when combined with compressive deformation data from the fruit, forms a comprehensive dataset. To detect tomato ripeness, four classification models—Long Short-Term Memory (LSTM), Convolutional Neural Networks (CNN), Multi-Layer Perceptron (MLP), and Fully Convolutional Networks (FCN)—are implemented. Among the four models, the LSTM network achieves the highest classification performance. The overall recognition accuracy for tomatoes of different ripeness levels, within the same variety and at room temperature, is determined to be 99%. The results demonstrate that the combination of a flexible gripper with hydrogel sensors not only preserves the integrity of the tomatoes but also ensures accurate detection of fruit ripeness. This innovation has the potential to significantly enhance the performance of tomato harvesting robots, contributing to more efficient and automated agricultural practices.
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Nature Communications
·
2024
·Vol. 15
·期 1
·1-11
·
IF 14.7
Yin Li-Juan,Du Boyuan,Hu Hui-Yi,Dong Wen-Zhuo,Zhao Yu,Zhang Zili,Zhao Huichan,Zhong Shao-Long,Yi Chenyi,Qu Liangti,Dang Zhi-Min
Dielectric elastomers, used as driver modules, require high power density to enable fast movement and efficient work of soft robots. Polyacrylate elastomers usually suffer from low power density under low electric fields due to limited response frequency. Here, we propose a bimodal network polyacrylate dielectric elastomer which breaks the intrinsic coupling relationship between dielectric and mechanical properties, featuring relatively high dielectric constant, low Young’s modulus, and wide driving frequency bandwidth (~200 Hz) like silicones. Therefore, an ultrahigh power density (154 W kg −1 @20 MV m −1 , 200 Hz) is realized at low electric field and high resonance frequency, 75 times greater than at 10 Hz. Further, a rotary motor is developed, reaching an impressive speed of 1245 rpm at 19.6 MV m −1 and 125 Hz, surpassing previous acrylate-based motors and entering the high-speed domain of silicone-based motors. These findings offer a versatile strategy to fabricate high-power-density dielectric elastomers for low-electric-field soft actuators.
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高影响因子
MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 9
·1-14
·
IF 5.3
Deng Tingliu,Wu Wuming,Zhou Jingjing,Zeng Qin,Wang Heye,Deng Chunyan
A novel bacteriophage-targeted electrochemical biosensor designed for accurate and quantitative detection of live Salmonella in food samples is presented. The biosensor is simply constructed by electrostatic immobilizing bacteriophages on MXene-nanostructured electrodes. MXene, renowned for its high surface area, biocompatibility, and conductivity, serves as an ideal platform for bacteriophage immobilization. This allows for a high-density immobilization of bacteriophage particles, achieving approximately 71 pcs μm −2 . Remarkably, the bacteriophages immobilized MXene nanostructured electrodes still maintain their viability and functionality, ensuring their effectiveness in pathogen detection. Therefore, the proposed biosensor exhibited enhanced sensitivity with a low limit of detection (LOD) of 5 CFU mL −1 . Notably, the biosensor shows excellent specificity in the presence of other bacteria that commonly contaminate food and can distinguish live Salmonella from a mixed population. Furthermore, it is applicable in detecting live Salmonella in food samples, which highlights its potential in food safety monitoring. This biosensor offers simplicity, convenience, and suitability for resource-limited environments, making it a promising tool for on-site monitoring of foodborne pathogenic bacteria.
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MICROCHIMICA ACTA
·
2024
·Vol. 191
·期 11
·1-11
·
IF 5.3
Shao Huikai,Zhao Lingguo,Liu Zhenping,Li Jinqi
A simple method for highly selective and sensitive prostate-specific antigen (PSA) detection using a molecularly imprinted electrochemical sensor is presented. The sensor was developed through an epitope imprinted strategy combined with electrochemical measurement techniques. An epitope molecularly imprinted polymer (EMIP) film was constructed on a AuNPs-coated gold electrode surface through electropolymerization, utilizing the C-terminus epitope of PSA (KWIKDTIVANP) as the template molecular and o -phenylenediamine as the functional monomer. The characteristics of EMIP film were investigated by using a scanning electron microscope and electrochemical test methods, including electrochemical impedance spectroscopy and cyclic voltammetry. Key parameters such as electropolymerization cycles, elution and rebinding times, and the molar ratio of template molecular to functional monomer were systematically optimized. The sensor demonstrated a detection limit (LOD) of 0.31 fg/mL and exhibited an excellent linear response towards PSA concentration ranging from 1.0 fg/mL to 0.1 µg/mL. Furthermore, the EMIP sensor showed excellent selectivity against other biological macromolecules, such as bovine serum albumin, human serum albumin, alpha-fetoprotein, and carcinoembryonic antigen. With recoveries between 95.89 and 106.04% for PSA detection in human serums the EMIP/AuNPs/AuE electrochemical sensor showed great potential in real sample analysis. Graphical Abstract
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Journal of Food Measurement and Characterization
·
2025
·
IF 3.3
Li Benyang,Shi Meng,Qin Si,Zeng Chaoxi
Fatty acids-based hydrophobic deep eutectic solvents (HDESs) have broad-spectrum antimicrobial activity. However, there is a lack of systematic studies on their antimicrobial mechanism at both experimental and molecular levels. In this work, we utilized hexanoic acid (HEA) and L-menthol (LST) to form HDES, and prepared HDES-in-water nanoemulsion, which is stable and effective in inhibiting the growth of E. coli . On this basis, we systematically investigated the antimicrobial mechanism of HDES against E. coli , examining the fluidity, integrity and permeability of cell membrane, morphological analysis of E. coli and molecular dynamics (MD) simulations. The results showed that HDES could decrease cell membrane fluidity and increase cell membrane permeability, which was further supported by MD simulations. In addition, HEA and LST can insert into the cell membrane, causing destabilization of the phospholipid bilayer, reduction of the membrane thickness, and disruption of the integrity of the cell membrane, leading to the efflux of intracellular material, which further promotes antimicrobial activity. The present work is important for the development of HDES-based natural antimicrobial agents to meet the increasing food safety challenges. Graphical
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JOURNAL OF SOLID STATE ELECTROCHEMISTRY
·
2015
·Vol. 20
·期 1
·29-36
·
IF 2.446
Meng Ling,Liu Yingru,Zhang Jingbo,Bai Shouli,Luo Ruixian,Chen Aifan,Lin Yuan
A novel two-phase method was employed to directly deposit PbS quantum dots (QDs) on nanocrystalline SnO 2 thin films. In the two-phase method, the nanocrystalline SnO 2 thin film with adsorption of Pb 2+ ions was placed in an aqueous solution, and S 2− ions were dissolved in an oil solution. As two solutions were contacted, S 2− ions prefer to transfer to the aqueous solution and diffuse to the thin film surface with the adsorbed Pb 2+ ions to homogeneously form monodispersed PbS QDs on the nanocrystalline thin film. The homogeneous monodispersed QDs-sensitized thin film was used as a photoelectrode to fabricate QDs-sensitized solar cell. The loaded amount of PbS QDs and the thickness of ZnS passivation layer were optimized to obtain the highest light-to-electric conversion efficiency of 1.01 % under the simulated AM 1.5 illumination, which is increased by 61 % compared with that of the PbS QDs-sensitized solar cell employing the successive ionic layer adsorption and reaction (SILAR). The solar cell with homogeneous sensitization of QDs generates a photocurrent density of 11.09 mA·cm −2 , which is 2.4 times higher than that of the unhomogeneous one prepared by SILAR. The conversion efficiency enhancement mechanism due to the two-phase method was discussed in detail through the measurements of intensity-modulated photovoltage spectrum and electrochemical impedance spectroscopy.
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MICROCHIMICA ACTA
·
2015
·Vol. 182
·期 15
·2395-2401
·
IF 3.741
Mei He,Sheng Qu,Wu Huimin,Zhang Xiuhua,Wang Shengfu,Xia Qinghua
Alloy nanoparticles of the type Pt x Fe (where x is 1, 2 or 3) were synthesized by coreduction with sodium borohydride in the presence of carbon acting as a chemical support. The resulting nanocomposites were characterized by scanning electron microscopy and X-ray diffraction. The nanocomposite was placed on a glassy carbon electrode, and electrochemical measurements indicated an excellent catalytic activity for the oxidation of glucose even a near-neutral pH values and at a working voltage as low as 50 mV (vs. SCE). Under optimized conditions, the sensor responds to glucose in the 10.0 μM to 18.9 mM concentration range and with a 3.0 μM detection limit (at an S/N ratio of 3). Interferences by ascorbic acid, uric acid, fructose, acetamidophenol and chloride ions are negligible.
Nonenzymatic sensing of glucose is demonstrated at neutral pH values and low working potential using a glassy carbon electrode modified with platinum-iron alloy nanoparticles on a carbon support.
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BIOTECHNOLOGY AND BIOPROCESS ENGINEERING
·
2015
·Vol. 20
·期 3
·550-560
·
IF 1.113
Hao Shanhu,Yan Ying,Ren Xue,Xu Ying,Chen Lanlan,Zhang Haibo
A multifunctional polymer-drug conjugate candesartan-graft-polyethyleneimine (CD-PEI, CP) containing low molecular weight polyethyleneimine (PEI) and candesartan (CD) conjugated via an amide bond was fabricated as a co-delivery micelle of drug and siRNA for potential lung cancer therapy. Here, CD as an angiotensin II type 1 receptor blocker rich in imidazole and tetrazole rings was utilized to strengthen endosomal buffering capacity of CP and suppress tumor angiogenesis. The selfassembled CP/siRNA complexes exhibited desirable and homogenous particle size, moderate positive charges, and efficient release of drug and siRNA in vitro . In addition, CD and siRNA could readily detached from nanovectors in tumor cells via an amidase-responsive mechanism and they achieved synergistic anti-angiogenesis efficacy by effectively downregulating the expression of vascular endothelial growth factor (VEGF) mRNA and protein via different pathways in vitro. In vivo investigation on nude mice bearing A549 tumor xenografts revealed that CP/siRNA complexes possessed strong antitumor activity. These findings suggested that CP could be an ideal nanovector for simultaneous transfer of drug and siRNA, and a multifunctional CP/siRNA co-delivery system with enhanced endosomal buffering capacity, amidase-responsive drug release and synergistic anti-angiogenesis efficacy might be a new promising strategy for effective lung cancer therapy.
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JOURNAL OF SURFACTANTS AND DETERGENTS
·
2015
·Vol. 18
·期 6
·1081-1088
·
IF 1.685
Binglei Song,Zonghui Xu,Xiaona Yu,Shuyi Chen,Shunan Li,Rongzhen Shi,Zhenggang Cui
Modification of the molecular structure of surfactants is an effective method for exploring their self-assembly. A double-tailed quaternary ammonium surfactant with a protrudent head group, namely 2-octyldecyltrimethylammonium bromide (2-ODTAB) was synthesized, and the solution properties were investigated by surface tension, dynamic light scattering, and cryogenic TEM. A comparative study was also performed on the traditional double-tailed homologue surfactants dioctyldimethylammonium bromide (8–8), didecyldimethylammonium bromide (10–10), and didodecyldimethylammonium bromide (12–12). The results showed that 2-ODTAB was more effective at lowering surface tension and in forming stable vesicles than traditional double-tailed surfactants with similar alkyl chain length. The reason is attributed to the improved structure of 2-ODTAB, in which the two alkyl tails are connected to the ionic head group by one carbon atom. This structure imparts more freedom to the head group and thus favors formation of more stable aggregates at low concentration. In addition, the lower limit of the alkyl chain length of the double-tailed surfactants for forming stable vesicles was illustrated.
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MICROCHIMICA ACTA
·
2015
·Vol. 182
·期 15
·2607-2613
·
IF 3.741
Yang Zhiqing,Xie Liyan,Yin Huanshun,Zhou Yunlei,Ai Shiyun
We describe an electrochemical bioassay for the detection of the activity of methyltransferase (MTase), and for screening this enzyme’s inhibitors. The assay is based on the conjugation of a hemin to a G-quadruplex that enables enzymatic signal amplification with the aid of exonuclease III (ExoIII). In the first step, double-stranded DNA containing the quadruplex-forming oligomer is assembled on the surface of a gold electrode and then methylated by DNA adenine methyltransferase (DAM). After cleaved by endonuclease DpnI, the methylated DNA is digested by ExoIII and the quadruplex-forming oligomers are liberated. This leads to the formation of a hemin/G-quadruplex (in presence of hemin and of potassium ions). The hemin/G-quadruplex catalyzes the oxidization of hydroquinone by H 2 O 2 and the benzoquinone was formed to generate electrochemical signal. Finally, the gold electrode modified with reduced graphene oxide was used as working electrode for performing differential pulse voltammetry. The method has a detection limit of 0.31 unit · mL −1 . A study on the inhibition of MTase showed it was inhibited by epicatechin with an IC50 value of 157 μM.
We describe an electrochemical bioassay for the detection of the activity of methyltransferase and for screening for its inhibitors. Due to the conjugation of a hemin to a G-quadruplex, strong enzymatic signal amplification is enabled with the aid of exonuclease III.
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ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
·
2015
·Vol. 22
·期 19
·14882-14890
·
IF 2.828
Shi Haiyan,Sheng Enze,Feng Lu,Zhou Liangliang,Hua Xiude,Wang Minghua
A highly sensitive direct dual-labeled time-resolved fluoroimmunoassay (TRFIA) to detect parathion and imidacloprid simultaneously in food and environmental matrices was developed. Europium (Eu 3+ ) and samarium (Sm 3+ ) were used as fluorescent labels by coupling separately with L 1 -Ab and A 1 P 1 -Ab. Under optimal assay conditions, the half-maximal inhibition concentration (IC 50 ) and limit of detection (LOD, IC 10 ) were 10.87 and 0.025 μg/L for parathion and 7.08 and 0.028 μg/L for imidacloprid, respectively. The cross-reactivities (CR) were negligible except for methyl-parathion (42.4 %) and imidaclothiz (103.4 %). The average recoveries of imidacloprid ranged from 78.9 to 104.2 % in water, soil, rice, tomato, and Chinese cabbage with a relative standard deviation (RSD) of 2.4 to 11.6 %, and those of parathion were from 81.5 to 110.9 % with the RSD of 3.2 to 10.5 %. The results of TRFIA for the authentic samples were validated by comparison with gas chromatography (GC) analyses, and satisfactory correlations (parathion: R
2 = 0.9918; imidacloprid: R
2 = 0.9908) were obtained. The results indicate that the dual-labeled TRFIA is convenient and reliable to detect parathion and imidacloprid simultaneously in food and environmental matrices.
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