Journal of Environmental Sciences
·
2020
·
IF 4.302
Zhao-Feng Yuan,Williamson Gustave,Raju Sekar,Jonathan Bridge,Jia-Yue Wang,Wei-Jia Feng,Bin Guo,Zheng Chen
The redox-sensitive elements, such as iron, manganese, sulfur, phosphorus, and arsenic, shift their speciation every millimeter (mm) across the soil-water interface in the flooded soil environments. Monitoring of element speciation at this high-resolution (HR) within the SWI is still difficult. The key challenge lies in obtaining sufficient porewater samples at specific locations along the soil gradient for downstream analysis. Here with an optimized inductively coupled plasma mass spectrometry (ICP-MS) method and a HR porewater sampler, we demonstrate mm-scale element profiles mapping across the SWI in paddy soils. High-concentrations of iron and manganese (> 10 mg/L) were measured by ICP-MS in an extended dynamic range mode to avoid signal overflow. The iron profile along the SWI generated by the ICP-MS method showed no significant difference ( p < 0.05) compared to that measured independently using a colorimetric method. Furthermore, four arsenic (arsenite, arsenate, monomethylarsonic and dimethylarsinic acid), two phosphorus (phosphite and phosphate) and two sulfur (sulfide and sulfate) species were separated in 10 min by ion chromatography -ICP-MS with the NH 4 HCO 3 mobile phase. We verified the technique using paddy soils collected from the field, and present the mm-scale profiles of iron, manganese, and arsenic, phosphorus, sulfur species (relative standard deviation < 8%). The technique developed in this study will significantly promote the measurement throughput in limited samples (e.g. 100 μL) collected by HR samplers, which would greatly facilitate redox-sensitive elements biogeochemical cycling in saturated soils.
研究领域:
土壤学
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环境科学
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分析化学
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DOI
PubMed
高影响因子
ACS Applied Nano Materials
·
2025
·
IF 5.5
Dacheng Xia,Jianping Li,Qiuyi Zhang,Shuwen Shen,Chenxu Sheng,Chunxiao Cong,Zhi-Jun Qiu,Laigui Hu,Ran Liu
With tunable and exceptional optical properties, quantum dots (QDs) have shown promise as valuable luminescent materials for various visual applications. However, achieving the economical and facile manufacturing of QD patterns still remains a challenge for high-resolution applications. QD arrays with pixel sizes down to micrometers are difficult to achieve with conventional techniques. In this work, a low-cost dewetting-assisted self-assembly approach for patterning QDs was demonstrated using oleophilic/oleophobic patterns on different substrates treated by lithography and surface modification. High-resolution ordered droplet arrays of UV-curable QD ink were formed on prepatterned templates. Resultant large-area QD arrays with a pixel size down to 5 μm exhibited a high resolution of 2540 pixels per inch (PPI). Furthermore, dual-color microarrays with a resolution exceeding 4 kPPI were achieved by transfer-printing red and green QD microdot patterns onto a receiving substrate. High-resolution fluorescent anticounterfeiting labels were then successfully demonstrated, implying an avenue for low-cost high-resolution QD patterns for luminescent applications, such as optical anticounterfeiting, information encryption, and displays.
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
高影响因子
BIOMATERIALS
·
2025
·
IF 12.9
Bingjie Li,Jinbin Pan,Ruijie Zhang,Bing Han,Yujie Zhao,Guijun Liu,Yujie Tong,Yujing He,Guangchao Xie,Ruxia Liu,Ting Zhou,Quan Zhang,Shao-Kai Sun
High-resolution vascular imaging at tens of micrometers in deep tissues in vivo remains a critical challenge. Ultrahigh field susceptibility-weighted imaging (SWI) holds promise but lacking compatible high-sensitivity imaging probes. Herein, we show a holmium (Ho)-based nanoprobes-enhanced SWI strategy for ultrahigh-resolution imaging of cerebral microvessels at 9.4 T. The polyethylene glycol (PEG)-NaHoF 4 nanoprobes (NPs) fabricated via coprecipitation synthesis combined with PEG modification possess uniform size, appropriate hydrodynamic size (20 nm), good biocompatibility, and long circulation half-life (710 min). Notably, the PEG-NaHoF 4 NPs exhibit high r 2 / r 1 742.7) and T 2 * relaxivity ( r 2 *, 73.16 s -1 mM -1 ) under 9.4 T due to the large magnetic moment (∼10.6 μ B ) and short electronic relaxation time (∼10 -13 s) of Ho 3+ . The high susceptibility of PEG-NaHoF 4 NPs in blood vessels induces a significant blooming effect, resulting in a magnified vascular appearance on SWI. In vivo high-resolution imaging of cerebral microvessels with diameters as small as 10 μm is achieved using PEG-NaHoF 4 NPs-enhanced SWI under 9.4 T. In two representative brain disease models, glioma and stroke, this nanoprobe enables high-resolution visualization of tumor vasculature and post-stroke collateral circulation, respectively. Our study offers a new paradigm for precise diagnosis of vascular-related diseases, providing a robust tool for their diagnosis, treatment, and prognosis assessment.
研究领域:
医学影像学
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神经科学
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材料科学
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产品关联
DOI
PubMed
高影响因子
ADVANCED MATERIALS
·
2025
·
IF 26.8
Jinmei Song,Yuhong He,Haijing Hu,Mingbian Li,Chenglong Li,Bai Yang,Haotong Wei
Computed tomography (CT) imaging has emerge as an effective medical diagnostic technique due to its rapid and 3D imaging capabilities, often employing indirect imaging methods through scintillator materials. Arraying scintillators that can confine light scattering to enable high-resolution CT imaging remains an area of ongoing exploration for emerging perovskite scintillators. Here an anti-scattering cesium lead bromide (CsPbBr 3 ) scintillator array embedded within a polyurethane acrylate matrix for CT imaging using a cost-effective solution-processed method is reported. Due to the large refractive index contrast between the scintillator and matrix, photon propagation can be well confined within the CsPbBr 3 scintillator array to significantly suppress the light scattering and enhance the light collection efficiency by nearly two times compared to the monolithic film. Furthermore, the scintillator array exhibits low-dosage and high-resolution CT imaging capability by reconstructing a 3D tooth image with a good spatial resolution of 20.1 lp cm −1 at a low effective dose of 0.22 mSv. This work highlights that the CsPbBr 3 scintillator array is a highly promising candidate for CT imaging.
研究领域:
医学影像
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材料科学
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放射学
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产品关联
DOI
PubMed
高影响因子
Advanced Optical Materials
·
2022
·Vol. 11
·期 3
·2202059
·
IF 10.05
Zhicheng Wang,Jiale Guo,Qi-Sheng Lin,Guanghui Rao,Jingtai Zhao,Chengzhang Yang,Weixiang He,Chujie Wang,Zhijun Zhang
Copper-based metal halide scintillators have received increasing attention due to their high light yield and nontoxicity. However, the synthetic methods are still not feasible for actual commercialization for the difficulty in scaling up and the absence of green chemical footprint. Herein, we report a new, simple, aqueous synthetic method for the mass production of highly purified and crystallized Cs 3 Cu 2 Cl 5 powder by a room-temperature reaction between a saturated aqueous solution of CsCl and a saturated hydrochloric acid solution of CuCl. The product exhibits a photoluminence peak centering at 527 nm (FWHM = 106.7 nm) and a quantum yield (PLQY) of 97%. A prototype X-ray imaging detector is fabricated by coupling a large area scintillation screen prepared by blade coating of Cs 3 Cu 2 Cl 5 powder and a commercial thin-film transistor (TFT) panel (16 cm × 13 cm, 125 µm pixel size) with readout circuit. The device exhibits a high spatial resolution of 4 lp mm −1 , exceeding the theoretical limit of the TFT panel, and an excellent dynamic imaging ability. In short, this work demonstrates an efficient novel synthetic method of Cs 3 Cu 2 Cl 5 and its application as X-ray imaging device, providing an applicable solution for its future commercialization.
研究领域:
材料科学
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医学影像
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化学工程
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产品关联
DOI
高影响因子
RAPID COMMUNICATIONS IN MASS SPECTROMETRY
·
2023
·Vol. 37
·期 13
·e9518
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IF 2
Lihua Qu,Xiaoyu Qi,Li Zhao,Yu Zhang,Ronghua Zhuge,Zhihui Hao,Congmin Liu
Rationale The residues of fipronil and its metabolites in chicken eggs pose a threat to human health, so regular monitoring is necessary. However, the pretreatments of the existing detection methods are complex and time-consuming. A simple and streamlined pretreatment method is needed to improve the detection efficiency. Method A rapid, efficient, and facile approach employing the quick, easy, cheap, effective, rugged, and safe (QuEChERS) method with online solid-phase extraction liquid chromatography tandem Q Exactive Orbitrap high-resolution mass spectrometry (online-SPE-LC-HRMS) was established and evaluated for the determination of fipronil, fipronil-desulfinyl, fipronil-sulfone, and fipronil-sulfide in chicken eggs. An improved sample preparation technique combining QuEChERS and online-SPE was developed. Negative targeted ion fragmentation scanning and targeted-selected ion monitoring of HRMS were adopted to identify and quantify the target analytes. Results The proposed pretreatment method took a few steps in <13 min to achieve excellent recoveries and negligible interference. High selectivity was acquired with the adoption of Q/Orbitrap HRMS. The limit of quantification (LOQ) of the analytes was 2.5 μg kg −1 , meeting the detection requirements of the maximum residue level enacted by the Codex Alimentarius Commission, Japan, and the United States for the sum of fipronil and its metabolites. Extraction recoveries at three spiked concentration levels were within 84.56% to 93.84%, with relative standard deviation ≤5.87%. Conclusion The established method is efficient and easy to operate and displays satisfactory LOQs, recoveries, accuracy, and precision. This approach serves as a reference method for monitoring eggs while providing potential solutions for fipronil determination in more complicated matrices.
研究领域:
食品安全
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分析化学
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毒理学
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产品关联
DOI
PubMed
高影响因子
ACS Applied Materials & Interfaces
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2022
·
IF 10.383
Zhi-Zhong Zhang,Jun-Hua Wei,Jian-Bin Luo,Xu-Dong Wang,Zi-Lin He,Dai-Bin Kuang
Current X-ray imaging scintillators are dominated by inorganic scintillators grown through a high-temperature process. Exploring new types of scintillators with mild growth conditions, high light yields, and eco-friendly chemical compositions is essential and challenging. Herein, the zero-dimensional large-area laminar organic–inorganic hybrid metal halide TEA2MnI4 (TEA = tetraethylammonium) single crystal with dimensions of 50 mm × 60 mm × 0.82 mm is grown via a local-heating solvent evaporation method. Compared with its Cl- and Br-based counterparts, the incorporation of the iodine component enhances the X-ray attenuation ability and significantly accelerates the decay of the photoluminescence of TEA2MnI4. Interestingly, the prepared TEA2MnI4 exhibits a high transmittance of >90% over the range of 515–765 nm and exhibits a high light yield of 26288 photons/MeV, which provides the prerequisite for high-resolution X-ray imaging. The TEA2MnI4 single-crystal scintillator displays an astonishing spatial resolution exceeding 25 line pairs per millimeter, which provides a design concept for a Mn–I-based single crystal for high-performance scintillator applications.
研究领域:
材料科学
·
医学影像学
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DOI
PubMed
高影响因子
Nanoscale
·
2020
·Vol. 12
·期 17
·9727-9732
·
IF 6.895
Qiang Xu,Juan Wang,Wenyi Shao,Xiao Ouyang,Xiang Wang,Xinlei Zhang,Yong Guo,Xiaoping Ouyang
Low dimensional scintillators have been successfully and widely applied in the radiation-detection community for home security, scientific research, and imaging. We have grown zero-dimensional Cs4PbBr6 materials with CsPbBr3 nanocrystals embedded by using a solution-growth method at low temperature. We have demonstrated the scintillation properties of these 0D nanoscintillators with high luminescence quantum efficiency for green light. In addition, we have successfully achieved pulse height spectra with this 0D perovskite material, which has been demonstrated with fast decay time (<10 ns), high energy resolution (3.0 ± 0.1%, 59.5 keV from 241Am), high light yield (64 000 photons per MeV) and long term stability under various atmospheres (moisture, radiation). These results are much better than those of the most widely used commercial products such as NaI(Tl). It also demonstrates that this 0D all-inorganic material can be employed as a scintillator for ionization radiation applications such as X-ray imaging and spectroscopy applications.
研究领域:
材料科学
·
辐射探测技术
✓ 已验证
产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2025
·
IF 19
Quan Nie,Junpeng Fan,Rui Xu,Zhiwei Yao,Yuqi Xiao,Chaoyu Xiang,Lei Qian,Ting Zhang
As one of the most promising next-generation display technologies, quantum dot light-emitting diodes (QLEDs) possess various advantages, such as high color purity, wide color gamut, high brightness, and solution processability. The preparation of quantum dot (QD) pixels is essential for commercializing QLED displays, and direct photolithography is considered an efficient method for fabricating ultra-high-resolution devices over large areas. However, the QD direct photolithography technology is still in its infancy. This study presents a novel direct photolithography technique based on a typical azide-alkyne click reaction. This method enables the cross-linking of adjacent QDs in an air environment using a 365 nm UV light source, and a low-energy dose (≈36 mJ cm −2 ). In addition, the QLEDs with crosslinked QD layers exhibit excellent performance, achieving a peak external quantum efficiency (EQE) of 20.05% and a maximum brightness over 166,000 cd m −2 at 5 V. Meanwhile, the QLEDs with pristine and photolithographic QDs exhibit comparable operational lifetime (T 95 ). It is believed that the novel direct photolithography technology based on azide-alkyne click reaction will advance the development of patterned QDs and facilitate the industrial production of ultra-high resolution QLED displays.
研究领域:
材料科学
·
显示技术
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
IEEE PHOTONICS TECHNOLOGY LETTERS
·
2018
·Vol. 31
·期 2
·133-136
·
IF 2.446
Zhi-Yong Hu,Yun-Lu Sun,Jian-Guan Hua,Yan-Hao Yu,Qi-Dai Chen,Hong-Bo Sun
Superior performances, such as high processing speed and resolution, make galvano-mirror-based fabricating strategy widely applied, particularly for micro/nano-scale femtosecond laser direct writing (FsLDW). However, the optically limited processing area restricts its applications. Here, we report a simple, low-cost, and universal pre-compensation method that corrected the off-axis optical aberrations to considerably expand the processing area of galvano-mirror-based nano-FsLDW with 3D nano-resolution maintained. A high-quality continuous-surface Fresnel lens was one-step fabricated with a 550-μm diameter, which surpassed the effective range (~150-μm) of the high-numerical aperture objective lens used for high resolution. It provides a significant approach for novel high-speed/efficiency micro/nano-FsLDW of diverse micro/nano-elements/systems.
研究领域:
光学工程
·
纳米技术
·
激光加工
·
微纳制造
·
材料科学
✓ 已验证
DOI
高影响因子
Petroleum Science
·
2024
·
IF 6
Jian-Xun Wu,Shuo-Fan Li,Qi-Fu Li,Feng Yan,Qi-Lin Zhou,Shuai Ma,Ya-He Zhang,Suo-Qi Zhao,Quan Shi
Heavy oil is an important resource in current petroleum exploitation, and the chemical composition information of heavy oil is crucial for revealing its viscosity-inducing mechanism and solving practical exploitation issues. In this study, the techniques of high-temperature gas chromatography and high-resolution mass spectrometry equipped with an electrospray ionization source were applied to reveal the chemical composition of typical heavy oils from western, central, and eastern China. The results indicate that these heavy oils display significant variations in their bulk properties, with initial boiling points all above 200 °C. Utilizing pre-treatment and ESI high-resolution mass spectrometry, an analysis of the molecular composition of saturated hydrocarbons, aromatic hydrocarbons, acidic oxygen compounds, sulfur compounds, basic nitrogen compounds, and neutral nitrogen compounds within the heavy oil was conducted. Ultimately, a semi-quantitative analysis of the molecular composition of the heavy oil was achieved by integrating the elemental content. The semi-quantitative analysis results of Shengli-J8 heavy oil and a conventional Shengli crude oil show that Shengli-J8 heavy oil lacks alkanes and low molecular weight aromatic hydrocarbons, which contributes to its high viscosity. Additionally, characteristic molecular sets for different heavy oils were identified based on the semi-quantitative analysis of molecular composition. The semi-quantitative analysis of molecular composition in heavy oils may provide valuable reference data for establishing theoretical models on the viscosity-inducing mechanism in heavy oils and designing viscosity-reducing agents for heavy oil exploitation.
研究领域:
石油化学
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分析化学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE
·
2014
·Vol. 95
·期 11
·2228-2236
·
IF 1.879
Pei-Hong Fan,Mei-Tong Zang,Jie Xing
BACKGROUND As probiotics, soy oligosaccharides have become popular as healthy foods to reduce disease risk. However, comprehensive information about oligosaccharides in different food legumes is limited. RESULTS In this study, eight oligosaccharides were well detected and quantified in different varieties of eight legume species using high-resolution mass spectrometry. It was determined that species could be distinguished by total content of oligosaccharides and their distribution modes. Among the studied species, Vigna unguiculata is a better resource of non-digestible oligosaccharides, while Vicia faba and black soybean ( Glycine max ) are at a disadvantage. Normally, stachyose predominates in non-digestible oligosaccharides, except in mung bean and broad bean, where verbascose predominates. For mung bean and green soybean, the seed coat should be taken into account for oligosaccharide consumption. The developed high-resolution mass spectrometry method greatly simplified the sample preparation process and permitted the identification of oligosaccharides without reference compounds. CONCLUSION This work involved extensive sample collecting and provided useful information for consumers. The developed method may be useful for rapid quantification of oligosaccharides in related foods. © 2014 Society of Chemical Industry
研究领域:
食品科学
·
植物化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）