Analytical Methods
·
2025
·
IF 2.6
Junaid Younus,Qi Wang,Weifan Pan,Jimin Shao,Xiaowei Guo,Xue Yang
Surface-enhanced Raman scattering (SERS) is a rapid, sensitive, and non-destructive technique for pesticide detection. However, most reported studies focus on single-analyte detection, and the simultaneous detection of multiple pesticide residues in complex matrices such as tobacco leaves remains challenging. In this study, we developed a portable SERS platform for the simultaneous detection of pendimethalin, propamocarb, and carbendazim using a polystyrene@silver (PS@Ag) core–shell substrate. The method enabled rapid detection (<15 min) with limits of detection (LODs) of 0.1 mg kg−1 for carbendazim, 5 mg kg−1 for pendimethalin, and 10 mg kg−1 for propamocarb in individual analyte detection, which meets the European Union's maximum residue limits (MRLs). In ternary mixtures, the LODs were 1 mg kg−1 for carbendazim, 5 mg kg−1 for pendimethalin and 10 mg kg−1 for propamocarb with strong linearity (R2 = 0.97–0.98). The substrate exhibited uniform enhancement with relative standard deviations (RSDs) of 3.53% for pendimethalin, 7.76% for propamocarb, and 4.70% for carbendazim, and high sensitivity, achieving enhancement factors for all target pesticides (3.4 × 101 for pendimethalin, 3.7 × 101 for propamocarb, and 6.0 × 103 for carbendazim). To the best of our knowledge, this is the first report to demonstrate that a PS@Ag SERS substrate combined with a portable Raman spectrometer serves as a highly reliable and promising tool for on-site monitoring of multiple pesticide residues in food safety and environmental applications.
研究领域:
分析化学
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环境监测
·
食品安全
·
纳米材料
·
光谱学
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高影响因子
Nanomaterials
·
2025
·Vol. 15
·期 11
·789
·
IF 4.3
Shunqi Mei,Feng Luo,Yi Xie,Bin Xu,Quan Zheng
Addressing the issues of poor thermal resistance in conventional polyolefin separators and the low production efficiency of electrospinning, this study innovatively employed high-efficiency centrifugal spinning technology to fabricate a ternary blended modified fiber membrane composed of polyacrylonitrile (PAN), polystyrene (PS), and polymethyl methacrylate (PMMA). By precisely adjusting the polymer ratio (8:2:2) and fine-tuning the spinning process parameters, a separator with a three-dimensional network structure was successfully produced. The research results indicate that the separator exhibited excellent overall performance, with a porosity of 75.87%, an electrolyte absorption rate of up to 346%, and a thermal shrinkage of less than 3% after 1 h at 150 °C, along with a tensile strength reaching 23.48 MPa. A lithium-ion battery assembled with this separator delivered an initial discharge capacity of 159 mAh/g at a 0.2 C rate and maintained a capacity retention of 98.11% after 25 cycles. Moreover, under current rates of 0.5, 1.0, and 2.0 C, the battery assembled with the ASM-14 configuration achieved high discharge capacities of 148, 136, and 116 mAh/g, respectively. This study offers a novel design strategy for modifying multi-component polymer battery separators.
研究领域:
材料科学
·
能源工程
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高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Zongping Wang,Ying Wan,Pengchao Xie,Aijiao Zhou,Jiaqi Ding,Jingwen Wang,Li Zhang,Songlin Wang,Tian C. Zhang
The effects of ultraviolet/persulfate (UV/PS) pretreatment on ultrafiltration (UF) membrane fouling caused by typical natural organic matter (NOM) fractions including humic acid (HA), sodium alginate (SA), and bovine serum albumin (BSA) were investigated. UF membrane fouling during the filtration of different NOM fractions after UV/PS pretreatment was compared through the evaluation of normalized membrane flux decline and membrane fouling reversibility. The fouling mitigation mechanisms were investigated through the characterization of ultraviolet absorbance (UV 254 ), dissolved organic matter , zeta potential , particle size distribution , fluorescence excitation-emission matrix spectra, and fitness of four classic fouling models. Furthermore, the fouled membranes were characterized by Fourier-transform infrared spectroscopy and scanning electron microscopy. The results showed that UV/PS pretreatment significantly alleviated membrane fouling caused by HA, SA, and HA-SA-BSA mixture, and the fouling control performance improved at high PS doses. However, either UV alone or UV/PS pretreatment at low PS dose (10 mg/L) significantly aggravated BSA fouling with the normalized flux at the end of first filtration cycle being 8% and 15%, respectively. The increased particle size of BSA after UV/PS pretreatment was attributed to the formation of aggregates, which mainly accumulated in membrane pores and aggravated membrane fouling. Modeling results suggest that the mitigation of membrane fouling derived from SA and mixed organic fractions was primarily ascribed to the control of cake filtration, while the mitigation of HA fouling was attributed to the declined contribution of standard blocking.
研究领域:
环境科学
·
水处理工程
·
膜技术
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PubMed
高影响因子
JOURNAL OF LUMINESCENCE
·
2023
·
IF 3.6
Yaofang Zhang,Yingwen Pan,Jian Ni,Zirui Yan,Nanping Deng,Wei Sun,Weimin Kang
Recently, all-inorganic CsPbX 3 (Br, I, CI) perovskites are hot and potential materials which apply to photoelectric device , due to their excellent photoelectric properties such as high carrier mobility , high fluorescence, etc. However, the poor stability greatly restricts their practical applications. In this paper, CsPbBr 3 nanocrystals (NCs) were in-situ encapsulated into PS polymer nanofibers by one step electrospinning with highly uniform size and spatial distribution. The hydrothermal stability of the obtained CsPbBr 3 @PS flexible fiber paper was radically improved with a photoluminescence quantum yield (PLQY) of 66.3%. The PL strength remained 97.2% of the initial value after immersion in water for 10 days. Their PLQY remains above 50% of its original value after heating at 80 °C for 5 h. Due to the excellent optical properties and stability of CsPbBr 3 @PS flexible fiber papers, the detection for rhodamine 6G (R6G) and rhodamine B (RhB) aqueous solution with high FRET value of 24.7% and 21.4%, respectively. Moreover, the minimum detection limit for R6G aqueous solution is 0.005 ppm. This study suggests that the CsPbBr 3 @PS flexible fiber paper is a good candidate for fabricating flexible optoelectronic devices, promising application potentials in lighting and display fields.
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高影响因子
JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 2
·399-407
·
IF 1.6
Zu Jianhua,Pan Xiaohan,Han Gang,Xue Yi,Diao Jingjie,Liu Siyu
A novel resin (PS-TMMA) with double functional groups exhibited high adsorption selectivity toward 99 TcO 4 − from the coexisting fission products (Sr, Eu, Dy, Cs) in 0.1–1 mol/L HCl. On the contrary, in neutral medium K d of PS-TMMA resin towards lanthanide elements was much higher than Tc. The results of column chromatography showed that light lanthanide was firstly penetrated on the column. Using 0.01 mol/L 2-hydroxyisobutyric acid as eluent, the adsorbed lanthanides could be effectively eluted at pH 3.03, and the light and heavy lanthanides were partially separated in effluents.
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CHEMICAL ENGINEERING JOURNAL
·
2019
·
IF 8.355
Liying Wu,Junming Hong,Qian Zhang,Bor-Yann Chen,Ji Wang,Zhengyu Dong
This first-attempt study explored interactive function of oxygen vacancies, transition metals, and surface hydroxyl groups for persulfate (PS) activation, at different pH conditions. Oxygen vacancy-rich Fe 2 Co 1 -LDHs was fabricated via calcination in hydrogen atmosphere. The Fe 2 Co 1 -LDH possessed the maximal concentration of oxygen vacancies and abundant hydroxyl groups for effective functioning according to the characterization through X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR). The BPA-degrading efficiency in the LDHs/PS system indicated that Fe 2 Co 1 -LDH exhibited the most promising activated performance since oxygen vacancies could improve the catalytic efficiency to enhance electron transport phenomena between the Fe and Co. N 2 experiments proved that the presence of oxygen vacancies could promote the production of 1 O 2 and O 2 − . Phosphate and pH effect experiments showed the Fe 2 Co 1 -LDH/PS system stably maintained operation performance over a wide pH range for bisphenol A (BPA) removal with the effect of surface hydroxyl groups. Practical samples had little effect on the removal of BPA. According to the quenching experiments and EPR technology, SO 4 − was the main active radicals in acid and neutral conditions and apparently the OH played the crucial role at alkaline pHs. Two different major reaction routes at different pH levels in the Fe 2 Co 1 -LDH/PS system for mechanisms of BPA degradation were proposed herein. The Chemical intermediates of BPA degradation were identified by gas chromatography-mass spectrophotometry (GC–MS) analysis, and degradation pathways were proposed for system optimization.
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高影响因子
ACS Applied Materials & Interfaces
·
2018
·
IF 8.097
Qian Zhao,Jiafang Piao,Weipan Peng,Yang Wang,Bo Zhang,Xiaoqun Gong,Jin Chang
Identifying the microRNA (miRNA) expression level can provide critical information for early diagnosis of cancers or monitoring the cancer therapeutic efficacy. This paper focused on a kind of gold-nanoparticle-coated polystyrene microbeads (PS@Au microspheres)-based DNA probe as miRNA capture and duplex-specific nuclease (DSN) signal amplification platform based on an RGB value readout for detection of miRNAs. In virtue of the outstanding selectivity and simple experimental operation, 5′-fluorochrome-labeled molecular beacons (MBs) were immobilized on PS@Au microspheres via their 3′-thiol, in the wake of the fluorescence quenching by nanoparticle surface energy transfer (NSET). Target miRNAs were captured by the PS@Au microspheres-based DNA probe through DNA/RNA hybridization. DSN enzyme subsequently selectively cleaved the DNA to recycle the target miRNA and release of fluorophores, thereby triggering the signal amplification with more free fluorophores. The RGB value measurement enabled a detection limit of 50 fM, almost 4 orders of magnitude lower than PS@Au microspheres-based DNA probe detection without DSN. Meanwhile, by different encoding of dyes, miRNA-21 and miRNA-10b were simultaneously detected in the same sample. Considering the ability for quantitation, high sensitivity, and convenient merits, the PS@Au microspheres-based DNA probe and DSN signal amplification platform supplied valuable information for early diagnosis of cancers.
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高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Hongmin Zhang,Xiaotong Yang,Xiaona Cui,Hejie Wang,Aixin Song,Xiao Chen,Hong-Guo Liu
Chiral supramolecules have attracted great research interest due to their unique properties and functions. How to assemble them into the ordered superstructures, however, remains a challenge. In this paper, two methods have been developed to fabricate such superstructures. In method I, polystyrene- b -poly (2-vinylpyridine) (PS- b -P2VP) and S-mandelic acid (S-MA) diffused from the oil and aqueous phases respectively to the oil/water interface, combined and self-assembled into helical nanowires and nanospheres with monochirality, and formed parallel-aligned nanowire arrays and close-packed arrays at the liquid/liquid interface. In method II, PS- b -P2VP in DMF droplets was introduced into the aqueous solution of S-MA through a liquid/liquid interfacial phase transfer process. Then the polymer molecules self-assembled into helical nanowires and nanospheres with monochirality in the aqueous phase, which adsorbed at the air/liquid interface and organized into superstructures. The formation of chiral aggregates should be attributed to the induction of S-MA, while the superstructures at the interfaces were considered to result from the modulation by the interfacial pressures. This study has developed one-step techniques to assemble the chiral aggregates and superstructures, which is expected to become universal for fabrication of functional superstructures.
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高影响因子
Nanomaterials
·
2024
·Vol. 14
·期 19
·1579
·
IF 4.4
Liying Jiang,Dongyang Li,Mingxing Su,Yirong Qiu,Fenghua Chen,Xiaomei Qin,Lan Wang,Yanghai Gui,Jianbo Zhao,Huishi Guo,Xiaoyun Qin,Zhen Zhang
Cardiac troponin I (cTnI) monitoring is of great value in the clinical diagnosis of acute myocardial infarction (AMI). In this paper, a highly sensitive electrochemical aptamer sensor using polystyrene (PS) microspheres as the electrode substrate material in combination with Prussian blue (PB) and gold nanoparticles (AuNPs) was demonstrated for the sensitive and label-free determination of cTnI. PS microspheres were synthesized by emulsion polymerization and then dropped onto the glassy carbon electrode (GCE); PB and AuNPs were electrodeposited on the electrode in corresponding electrolyte solutions step by step. The PS microsphere substrate provided a large surface area for the loading mass of the biological affinity aptamers, while the PB layer improved the electrical conductivity of the modified electrode, and the electroactive AuNPs exhibited excellent catalytic performance for the subsequent electrochemical measurements. In view of the above mentioned AuNPs/PB/PS/GCE sensing platform, the fabricated label-free electrochemical aptamer sensor exhibited a wide detection range of 10 fg/mL~1.0 μg/mL and a low detection limit of 2.03 fg/mL under the optimal conditions. Furthermore, this biosensor provided an effective detection platform for the analysis of cTnI in serum samples. The introduction of this sensitive electrochemical aptamer sensor provides a reference for clinically sensitive detection of cTnI.
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高影响因子
Journal of Materials Chemistry A
·
2017
·Vol. 5
·期 22
·11163-11170
·
IF 8.867
Lifeng Hang,Yiqiang Sun,Dandan Men,Shengwen Liu,Qian Zhao,Weiping Cai,Yue Li
Hierarchical micro/nanostructured C doped Co/Co3O4 hollow spheres were prepared by two-step treatment (annealing at 600 °C in an Ar atmosphere and then at 250 °C in air) of PS@Co(OH)2 core–shell structures templated from PS microspheres without any modification. In 1 M KOH, such hollow nanospheres showed an overpotential of 352 mV at a benchmark oxygen evolution reaction (OER) current density of 10 mA cm−2, which was lower than that of RuO2 (364 mV), Co3O4 hollow nanospheres (410 mV) and C-Co/Co3O4 nanoparticles (462 mV). Importantly, the C-Co/Co3O4 hollow spheres exhibited a small onset potential (1.49 V) due to their more active sites, higher electrical conductivity, larger specific surface area, and excellent electron and ion diffusion permeability. This work provides a strategy to design and fabricate earth-abundant, low-cost electrocatalysts for water splitting in practical applications.
研究领域:
材料科学
·
电化学
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DOI
高影响因子
ACS Applied Materials & Interfaces
·
2026
·
IF 7.8
Xianghe Liu,Bingqi Liu,Hongtao Xu,Haonan Li,Peng Li,Zhuo Zuo,Qibiao Wang
Efficient discrimination of thermal neutrons, fast neutrons, and γ-rays is of great importance for radiation monitoring, nuclear security, and fundamental research. However, conventional plastic scintillators, despite their low cost and fast response, generally suffer from limited neutron/gamma (n/γ) discrimination capability, which motivates the development of advanced scintillation materials and dedicated detection systems. In this work, we developed a polystyrene/poly(methyl methacrylate) (PS/PMMA) blended plastic scintillator that combines the high light yield of PS with the mechanical robustness of PMMA. A boron-containing dopant, bis(pinacolato)diboron (B2Pin2), was introduced together with optimized dye and cross-linker concentrations to enhance neutron sensitivity and overall scintillation performance. To evaluate the detector performance, we further constructed a custom measurement platform consisting of a photomultiplier tube (PMT)-based readout module and a high-speed pulse waveform analysis system. Experiments with a 241Am–Be source demonstrate that the developed scintillator exhibits effective pulse shape discrimination capability, demonstrating statistical discrimination of γ-ray-, fast-neutron-, and thermal-neutron-related event populations within a single detector system.
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高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2026
·
IF 12.5
Peng Su,Rui Feng,Ling Zhou,Bowei Liu,Tong Zhou,Ruoyu Dong,Lijie Dong
A microphase-separated block copolymer enables resilient BTO-based composites. • PS-rich rigid nanodomains promote stress dispersion in the composite. • Reduced hysteresis and improved cyclic compression stability are achieved. • 98.4% response retention and intact interface remain after 10,000 cycles at 100 N. Stable mechano-electric response under repeated contact and compression is in high demand for resilient piezoelectric composites used in embodied intelligence and human-machine interfaces. Such composites are commonly fabricated by dispersing high-performance ceramic fillers into elastomeric matrices. However, stable mechano-electric response relies on efficient and durable stress transfer from the soft matrix to the piezoelectric phase, which is hindered by the stiffness disparity, often approaching five orders of magnitude, between rigid ceramic fillers and MPa-level soft elastomers. The soft matrix dissipates mechanical energy through viscoelastic deformation, while the abrupt ceramic-elastomer stiffness transition leads to interfacial stress concentration and unfavorable stress localization. Herein, we develop a microphase-separated block copolymer matrix, crosslinked PS- b -P(DMS- stat -VMS) (CroPSDV), loaded with barium titanate (BTO) nanoparticles. Microphase separation in CroPSDV produces PS-rich rigid nanodomains within a soft polysiloxane-rich matrix, forming a mechanically heterogeneous architecture that may facilitate local stress redistribution and mitigate stress concentration around BTO nanoparticles while buffering the ceramic-elastomer stiffness contrast. Together with in situ thiol-ene crosslinking, this architecture structurally encapsulates and confines BTO nanoparticles, reduces hysteresis loss, and stabilizes cyclic compression behavior. The BTO/CroPSDV composite retains stable mechano-electric output over 10,000 compression cycles at 100 N, with an output retention of 98.4% and without obvious matrix-filler interfacial damage after cycling. It also exhibits sensitive and rapid mechano-electric response, with a detection limit of 1 N and a response time of 43 ms. This work presents a mechanically active matrix-design strategy for resilient piezoelectric composites for stress dispersion and cyclic interfacial stability. Download: Download high-res image (264KB) Download: Download full-size image
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