MATERIALS CHEMISTRY AND PHYSICS
·
2017
·
IF 2.084
Mengyou Zhou,Qiuyun Li,Shuxian Zhong,Jianrong Chen,Hongjun Lin,Xi-Lin Wu
In this work, a scalable and cost-effective approach was developed for the synthesis of magnetic carbon nano-onions (MCNOs) by using iron (III) acetylacetonate modified candle as the raw materials. The candle soot was collected from the burning candle and then subjected to calcination at 800 °C under N 2 atmosphere. The obtained MCNOs were further applied as adsorbent for the removal of bisphenol A (BPA) from aqueous solutions. Adsorption of BPA onto the MCNOs was investigated with the influence of initial concentration of BPA, solution pH, and adsorption time. The results demonstrated the adsorption of BPA onto the MCNOs was almost not affected by pH in the range from 5–9. The adsorption isothermal and kinetic's data were better fitted by Langmuir isotherm and pseudo-second-order kinetic model, respectively. Moreover, the MCNOs are easily recycled by using and external magnet and regenerated by simply methanol washing. The results present here not only provide a novel synthetic approach toward low-cost nanocarbons but also revealed the great application potential of the MCNOs for the removal of endocrine disrupting compounds from aqueous solution.
研究领域:
环境科学
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材料科学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Materials Chemistry A
·
2018
·Vol. 6
·期 43
·21605-21617
·
IF 9.931
Yichun Wang,Xin Zhang,Peixun Xiong,Fuxing Yin,Yunhua Xu,Biao Wan,Qingzhou Wang,Gongkai Wang,Puguang Ji,Huiyang Gou
WSe2 onions were synthesized using a homemade chemical vapor deposition (CVD) method. The formation of a very fine particle size and spherical microstructure was attributed to the fast cooling rate and reduction of the surface energy of two-dimensional (2D) WSe2 after nucleation and growth during the synthesis process. A specific capacity of 205 mA h g−1 at 10 A g−1vs. sodium ions can be reached, representing the best sodium ion rate capability ever reported for WSe2. An exceptionally high capacitive contribution showed that fast intercalation kinetics were present, which were attributed to the intrinsic properties and the unique microstructure of WSe2. Sodium ions could be stored faster than lithium ions throughout WSe2 due to the different intercalation mechanisms, as concluded from electrochemical investigations and simulation. The sodium ion capacitors (SICs) delivered superior energy/power densities (the maximum energy density is 123.1 W h kg−1 and the maximum power density is 14.1 kW kg−1), demonstrating that WSe2 is a promising alternative for SICs that could rival lithium ion capacitors (LICs) and shedding new light on novel 2D material design of SICs with high energy/power densities.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Nano Materials
·
2022
·
IF 6.14
Ye Zhang,Bo Zhu,Xiaomin Yuan,Baoming Wang,Xun Cai,Junwei Yu,Na Sun,Chengsen Li,Xuechen Liang
Due to the typical strong and tough graphitic structures, carbon nanofibers (CNFs) theoretically have excellent mechanical properties. However, in practice, the defects and misalignments in these crystal domains always jeopardize the performance of CNFs and limit their further application. In this case, this paper takes onion-like carbon (OLC) as an effective nanofiller to optimize the fiber graphitic structure and produces composite CNFs with enhanced strength and toughness. For this purpose, the in situ polymerization technique is specially developed for the rapid and uniform distribution of OLC in the polyacrylonitrile (PAN) precursor of CNFs. The obtained PAN-coated OLC nanoparticles successfully avoid the agglomeration of nanofillers and can be further electrospun into OLC uniformly doped PAN nanofibers. Owing to the interaction between OLC and PAN matrix, the crystal domains in PAN precursor nanofibers are thicker and transformed from integrated shish-kebab structures into nanofibril crystals with better regularity and orientation. In the subsequent stabilization and carbonization processes, these crystalline nanofibrils are considered to be the structural basis for the formation of oriented and continuous graphitic domains in final CNFs. Meanwhile, the graphitic shells of OLC are confirmed to act as the template in the carbonization process to induce and promote the crystallization of the surrounding fiber matrix and transform the turbostratic structures in fiber crystal domains into more orderly graphitic structures with increased size and continuity. Furthermore, the embedded nanoscale OLC can co-move and continuously interact with the resulting graphitic domains during the deformation process for load transfer. As a result, the tensile strength and elongation at break of OLC-reinforced CNFs increase by 53.5 and 34.0%, respectively. The strong and tough composite CNFs may help to avoid the potential fiber breaking in their practical use and be further applied in wearable capacitors, masks, filters, etc.
研究领域:
材料科学
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纳米技术
✓ 已验证
DOI
高影响因子
Antioxidants
·
2023
·Vol. 12
·期 7
·1448
·
IF 7
Kongming Fan,Yan Li,Qiaofeng Fu,Jinmin Wang,Yong Lin,Linyu Qiu,Li Ran,Junli Yang,Chunyan Yang
Active fractions and constituents with antioxidant and lipid-lowering activities were investigated using bio-assay-guided isolation and identification. The data showed that the antioxidant fraction ofA. cepawas AC50%, the main constituents of which were quercetin and isoquercitrin, by way of both ultra-high performance liquid chromatography–mass spectrometry (UPLC-MS) and bio-assay-guided purification and elucidation. Similarly, the lipid-lowering active fraction ofA. cepawas AC30% with the main constituents of 3,4-dihydroxybenzoic acid and quercetin 3,4′-O-diglucoside. Also, bio-assay-guided isolation led to the isolation and identification of five known compounds with a purity of more than 98%, and quercetin was both the best free radical scavenger and lipid-lowering constituent. Moreover, the mechanism of the lipid-lowering effect of AC30% might be its reduction in mRNA expression levels of sterol regulatory element binding protein 2 (SREBP2) and FAS gene in lipid synthesis. Otherwise, reducing the mRNA expression level of lipid synthesis genes, including SREBP1, SREBP2, fatty acid synthetase (FASN),β-Hydroxyβ-methylglutaryl-CoA (HMGCR), stearoyl CoA desaturase 1 (SCD1), and increasing the mRNA expression level of lipid decomposition gene, such as carnitine palmitoyl transferease-1 (CPT1), might be involved in the lipid-lowering activity of quercetin. This study suggested thatAllium cepamight be used to prevent and treat oxidative stress and dislipidemia-related disorders, including NAFLD.Keywords:Allium cepa;lipid lowering;antioxidant;effective fractions;active constituents
研究领域:
植物化学
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药理学
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分子生物学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2025
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IF 4.6
Shan Sun,Dan Yang,Zheng Li,Wei Cheng,Yanli Yang,Ling Li,Xiangjie Luo,Yong Qian
Biogenic amines (BAs) are a class of nitrogen-containing natural organic compounds. Elevated levels of BAs are a reliable indicator of food spoilage and pose a significant risk to human health. Thus, the development of real-time sensors for BAs monitoring is crucial. In this study, we present a novel fluorescence probe, TP-A , based on ylidenemalononitrile enamine, which can detect various BAs including putrescine, cadaverine, and spermine. TP-A exhibits a significant fluorescence intensity increase at 600 nm in the presence of these BAs in an aqueous system, which can effectively monitor BAs in representative vegetable onion tissues. Notably, TP-A -loaded filter paper has been developed into test strips for real-time monitoring of BAs released from shrimp under different temperatures. This work offers a precise method for probing the release of BAs in real food samples, which is promising for application in food quality control.
研究领域:
食品科学
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分析化学
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生物化学
✓ 已验证
DOI
PubMed
高影响因子
JOURNAL OF FOOD SCIENCE
·
2025
·Vol. 90
·期 3
·e70167
·
IF 3.4
Chae-Yeon Woo,Gi-Hyeok Lee,Kyung-Jik Lim,Jun-Won Kang
The use of blue light within a range of 400–470 nm holds significant potential for sanitization purposes. However, due to an extended exposure duration needed for an antibacterial effect, the utilization of a photosensitizer (PS) to increase the efficacy of the treatment becomes essential. This study investigated prospective use of onion peel extract as a PS in combination with 405 nm blue light for the inactivation of Salmonella Typhimurium, a common foodborne pathogen on eggs. Extracts were obtained using 99% ethanol, 50% ethanol, and distilled water (DW). Their photosensitizing activities were then compared. The combination of 405 nm blue light and onion peel extract using 99% ethanol reduced bacterial populations more effectively than blue light treatment alone, while also increasing reactive oxygen species generation, cell membrane permeability, lipid peroxidation, and DNA damage levels. However, the antimicrobial effect of the 99% ethanol extract did not show a concentration dependence. Spraying DW extract on eggshell treated with 99% ethanol onion peel extract at 1 mg/mL and blue light further enhanced Salmonella reduction. Liquid chromatography was conducted for component separation. However, none of the separated fractions exhibited a significant antibacterial effect, suggesting that the active compounds responsible for antibacterial activity might work synergistically in the crude extract rather than individually. In contrast, the crude extract exhibited a significant antibacterial effect, suggesting that 99% ethanol-extracted onion peel can serve as a PS, particularly in its crude state without purification, and effectively inactivate Salmonella on eggshells. Practical Application Antimicrobial blue light (aBL) in the range of 400–470 nm is a promising nonthermal technology with several advantages, including minimal impact on food quality and safety. This study optimized the concentration of onion peel extract to improve its effectiveness as a photosensitizer in aBL treatment against Salmonella Typhimurium on eggshells. These results may serve as a reference for further optimizing aBL treatments, offering a potentially sustainable and cost-effective photosensitizer for pathogen control.
研究领域:
食品安全
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微生物学
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食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Nanomaterials
·
2019
·Vol. 9
·期 8
·1115
·
IF 4.034
Chuan Li,Mingling Li,Xinyun Wang,Weimin Feng,Qiangqiang Zhang,Bo Wu,Xianguo Hu
The objective of this study was to investigate the roles and tribological mechanisms of onion-like carbon nanoparticles derived from biodiesel soot (BDS) when applied in water (H2O) and liquid paraffin (LP). In this study, we prepared nitric acid-treated BDS (NA-BDS) as an additive to H2O and NA-BDS modified with oleylamine (NA-BDS-OLA) as an additive to LP. Raman spectroscopy, field-emission transmission electron microscopy, Fourier transform infrared spectroscopy, and zeta potentiometry were used to characterize the results of the nitric acid treatment and oleylamine modification. The tribological behaviors and corresponding mechanisms of the new onion-like carbon nanoparticles were evaluated using a ball-on-disc reciprocating tribometer, as well as field-emission scanning electron microscopy, three-dimensional laser scanning microscopy, and Raman spectroscopy. The results indicated that the additives NA-BDS and NA-BDS-OLA, which were onion-like carbon nanoparticles with sizes ranging from 35 to 40 nm, enhanced the antiwear and friction reduction properties of H2O and LP, respectively. Through tribo-mechanisms, these types of soot can serve as spacers and ball bearings between the rubbing surfaces. Moreover, exfoliation under a high load as a result of the formation of a graphitic layer facilitates easy shearing.Keywords:biodiesel soot;carbon nanoparticles;onion-like;lubricant additive
研究领域:
材料科学
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纳米技术
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摩擦学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Journal of Materials Chemistry A
·
2015
·Vol. 3
·期 43
·21805-21814
·
IF 7.443
Yangming Lin,Yansong Zhu,Bingsen Zhang,Yoong Ahm Kim,Morinobu Endo,Dang Sheng Su
Incorporating heteroatoms into onion-like carbon (OLC, average size ∼5 nm) with a fullerene-like structure and investigating its peculiar properties are fascinating challenges. Here, we present straightforward fabrication of doped OLC samples with a high concentration of boron (0.63–4.57 at%) via a high-temperature thermal diffusion method. The highest proportion of substitutional boron of the boron species reaches 29%, which far exceeds most of the reported boron-doped carbon materials. The influence of boron on the fullerene-like layers and electronic properties of OLC is systematically investigated using Raman spectroscopy with different excitation energies (1.58–3.8 eV) and ultraviolet photoelectron spectroscopy (UPS). The as-prepared boron-doped OLC samples exhibit a perfect four-electron process for the oxygen reduction reaction (ORR), which is similar to commercial Pt/C. It is worth noting that the intrinsic relationship between the electronic properties and catalytic performance of doped samples is explored based on experimental studies instead of theoretical calculations. The results indicate that the lower work function, lower valence band edge and higher density of states (DOSs) of doped OLC are crucial to improve the catalytic performance. Our work can provide valuable information on the design of doped metal-free materials and give new evidence for enhanced ORR activity associated with heteroatom doping and electronic properties.
研究领域:
材料科学
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电化学
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2022
·
IF 9.231
Shiyang Zhou,Gangliang Huang,Hualiang Huang
The preparation of purified polysaccharides was described from fresh onions by hot water extraction, protein removal and dialysis treatment. The structure of onion polysaccharide was confirmed by 13 C NMR, DEPT, COSY, HSQC and HMBC. In order to study the structure–activity relationship of onion polysaccharide, the derivatives of onion polysaccharide including acetylated onion polysaccharide and phosphoric onion polysaccharide were prepared. On this basis, the antioxidant activities of onion polysaccharide and its derivatives were tested in vitro . The results showed that onion polysaccharides and its derivatives had a good antioxidant activity, and the activity of phosphorylated polysaccharide was similar to that of V c positive control.
研究领域:
食品科学
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生物化学
✓ 已验证
DOI
PubMed
高影响因子
SOIL BIOLOGY & BIOCHEMISTRY
·
2025
·
IF 10.3
Zixuan Zhao,Bin Luo,Tao Cao,Tongtong Bai,Yifan Sun,Hengrui Liu,Li Zhang,Jun Xie,Jun Wang,Huakang Li,Zichen Duan,Zixuan Gao,Xiaojuan Wang,Jie Gu,Xun Qian,James M. Tiedje
The transmission and transformation patterns of antibiotic resistance genes (ARGs) in the soil-onion continuum under the application of organic fertilizers in actual agricultural cultivation are still unknown. This study systematically analyzed the occurrence characteristics of ARGs in soil and onion (roots and bulbs) under the application of organic fertilizer from livestock manure, and revealed the response mechanism of phenolic metabolites in roots. The results showed that fertilization promoted the enrichment of ARGs in the soil and onions. The abundance of ARGs in the bulbs of the pig manure and sheep manure treatment groups was 4 times and 2 times as high as that in the unfertilized group, respectively. In comparison to the bulbs, a higher abundance of ARGs was observed in the roots of onions. The 11 ARGs, including high-risk variants such as tetX and mexE , were detected co-occurring in both onion tissues and the surrounding soil. Fertilization treatment significantly changed the community composition of ARGs-related host bacteria in onion tissues. Livestock manure-based organic fertilizers elevated the potential exposure risk of ARGs in bulbs by more than 20%. Five strains of multidrug-resistant endophytic bacteria (including Streptomyces and Pseudomonas ) were isolated from the main edible parts of onion bulbs. It is worth noting that this study found that kaempferol (35-140 μg/L) and p-coumaric acid (2.5-10 μg/L) significantly enhanced the conjugation and transfer of the RP4 plasmid in the onion endophytes ( Bacillus sp. and Paenibacillus sp.) and soil microbial communities. Root exudates were the predominant factors regulating the transmission of ARGs in the soil-onion system.
研究领域:
环境科学
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微生物学
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农业科学
✓ 已验证
产品关联
DOI
高影响因子
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
·
2023
·
IF 5.2
Ye Zhang,Bo Zhu,Xun Cai,Shengyao Zhao,Kun Qiao,Xiaomin Yuan,Junwei Yu,Na Sun,Chengsen Li,Xuechen Liang,Chaohong Liu
Carbonaceous nanofillers have been widely used as template additives to strengthen carbon nanofibers (CNFs), while their poor dispersion and insufficient interaction with fiber matrix often limit their optimization roles. Herein, this paper takes functionalized onion-like carbon (fOLC) as an improved nanofiller and provides a bottom-up solution to prepare fOLC-reinforced CNFs. The in-situ polymerization technique is developed to introduce fOLC in polyacrylonitrile (PAN) precursors. Meanwhile, moderate functionalization of the nanofiller is applied to further promote their dispersion and interaction with PAN. On this bases, the nanoscale spherical fOLC can achieve uniform distribution in the fiber matrix without the trouble of shape control, thus having more comprehensive impacts on fiber structures. It is shown that the added fOLC can organize the PAN molecular chains into crystalline nanofibrils in as-spun nanofibers and further promote their graphitization through nucleating and templating effects during annealing. In this case, the dispersed fOLC not only increases nucleation sites to cause grain refinement, but these rigid nanoparticles with well-developed interaction with the fiber matrix can further impede crack propagation through dispersion strengthening. As a result, the tensile strength and elongation at break of CNFs simultaneously increase by up to 65.15 % and 41.25 %, respectively.
研究领域:
材料科学
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纳米技术
✓ 已验证
DOI
高影响因子
CERAMICS INTERNATIONAL
·
2023
·
IF 5.2
Yang Guo,Haipeng Lu,Xian jian
Synthesizing lightweight, thin–profile, and high–performance microwave absorbers has emerged as an urgent research topic. A promising strategy for carbon–based materials to achieve these attributes is to rationally construct heterostructures. Herein, 0.89–1.54 at.% nitrogen(N)–doped carbon onion nanotube chains (NCONCs) were produced by blending CONCs harvested from candle combustion with HH 4 Cl and subjecting them to heating at 300–400 °C for 3 h. The hinge–like NCONCs revealed numerous electron transport paths, facilitating the formation of multi–tiered conduction networks. The N–doping introduced C–N groups and interfaces into the CONCs, which yielded extensive dipole and interfacial polarization. Simultaneously, the 1.14 at.% N–doping endowed NCONC–400 with suitable conductivity, thereby ensuring excellent impedance matching. The resulting synergistic effect of impedance matching and electromagnetic wave attenuation was clearly observed. Specifically, NCONC–400 exhibited exceptional performance with a maximum effective absorption bandwidth of 4.71 GHz and a peak reflection loss of –35.47 dB at 1.4 mm. The radar cross–section reduction demonstrated by NCONC–400 composites reached 21.43 dB cm 2 . These impressive results prove the distinctive advantages of CONCs in tailoring performance and optimizing impedance matching, which are appealing for lightweight and efficient microwave absorbers.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）