ANALYTICAL CHEMISTRY
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2022
·
IF 8.008
Li Fu,Bin Zhang,Xuwen Gao,Shuangtian Dong,Dongyang Wang,Guizheng Zou
The photoluminescence, electroluminescence, and electrochemiluminescence from nanocrystals (NCs) have been extensively exploited for both fundamental and applied investigation over two decades, while the understanding of chemiluminescence (CL) from NCs is still far from clear by now. Herein, a general route for triggering CL from NC luminophore is proposed by extensively exploiting the charge transfer between n-type NCs and oxidants. Oxidants, such as K2S2O8, H2O2, KMnO4, and NaClO, can chemically inject the hole onto the valence band (VB) of methionine-capped n-type AuNCs (Met@AuNCs) and enable the occurrence of efficient radiative-charge-recombination between the chemically injected exogenous VB hole and the pre-existed endogenous conduction band (CB) electron, which eventually results in single-color and defect-involved CL with the maximum emission wavelength around 824 nm. The CL of Met@AuNCs/oxidant is qualified for ultrasensitive CL immunoassay in a similar procedure to the biotin–avidin and magnetic separation involved commercial CL immunoassay and exhibits acceptable performance for linearly determining carcinoembryonic antigen from 50 pg/mL to 100 ng/mL with a limit of detection of 10 pg/mL (S/N = 3). This strategy provides a general route to develop nanoparticulate CL luminophores and might eventually enable CL multiplexing assay via extensively exploiting the CL of different wavebands.
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TEXTILE RESEARCH JOURNAL
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2018
·
IF 1.54
Xue Zhao
Three azo dyes were synthesized using N-butyl substituted phthalimides as diazo components. All of the synthesized intermediate derivatives and dyes were characterized by mass spectrometry, proton nuclear magnetic resonance, infrared (IR) and elemental analyses. Synthesized dyes were also evaluated for their dyeing behavior and fastness properties toward polyester fabric. The ultraviolet-visible absorption maxima of the dyes were observed in the range of 445–563 nm. Bromo and cyano substitutions at the 3- and/or 5- positions of the phthalimide ring resulted in hypsochromic and bathochromic shifts, respectively. IR spectra peaks at 1770 and 1395 cm−1 of hydrolyzed dye showed that C–O groups appeared under relatively mild alkaline conditions. The K/S values of dyed polyester/elastane fabrics decreased obviously as the pH value increased. Hydrolysis of the phthalimide ring was found to be largely influenced by steric effects rather than inductive effects. Bromo substituted dyes have the lowest rates of hydrolysis. Compared with S-type dyeing disperse dyes, phthalimide dyes have lower dyeing rates and lower levelness of dye migration. The ωB97XD/6-311G(d,p) calculation found that pi-stacking interactions of phthalimide–benzene and phthalimide–phthalimide dimers increased the dye–fiber and dye–dye interactions.
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NANO
·
2019
·
IF 1.293
Hongning Wang,Chao Xu,Yongsheng Zhou,Wenpu Zhao,Jing Zhong,Weiqiu Huang,Ruoyu Chen
Hierarchical N-doped carbon nanotubes (NCTs) with controllable aspect ratios were developed for CO 2 adsorption. In this work, NCTs were synthesized by coating different amounts of 3-aminophenol/formaldehyde resin (APF) on the outer layer of silica nanotubes, carbonizing in N 2 at 700 ∘ C and removing the silica and Ni template by hydrofluoric acid etching. The obtained NCTs were activated by K 2 CO 3 . After activation, micropores on the activated N-doped carbon nanotubes (ANCTs) were enriched, the micro-surface area and pore volume of ANCT-1.0 reached 1195 m 2 g − 1 and 0.45 cm 3 g − 1 , respectively, and the corresponding adsorption capacity increased by 50% (4.50 mmol g − 1 at 0 ∘ C and 1 bar). Moreover, ANCT-1.0 maintained a high stability throughout consecutive adsorption–desorption cycles. The advantages of hierarchical N-doped carbon nanotubes, including their meso–microporous structures, high geometric aspect ratio and good stability, make them valuable and promising materials to capture carbon dioxide.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2025
·Vol. 36
·期 3
·1-12
·
IF 2.8
Wang Zhenxing,Luo Qingsong,Huang Yiheng,Chen Yan,Wang Yimu,Feng Changhao
The sensitive and rapid detection of n-butanol gas is crucial for ensuring industrial safety, environmental protection, and biological health. In this study, we employed electrospinning to fabricate a series of CuBi 2 O 4 nanofibers and nanotubes, followed by thorough characterization and analysis of their structural and functional features using XRD, FE-SEM, TEM, and XPS techniques. The gas-sensing performance demonstrates that CuBi 2 O 4 nanotubes (CBO-500) exhibit an exceptionally rapid response to n-butanol, highlighting their potential for use in high-sensitivity n-butanol sensors. The sensor exhibited a response of 12.30–10 ppm n-butanol at 150 °C, with a rapid response time of 2 s and a recovery time of 41 s. Furthermore, the sensors based on CBO-500 nanotubes exhibited excellent selective. In addition, this study elucidates the underlying mechanisms responsible for the gas-sensing properties of CuBi 2 O 4 nanotubes toward n-butanol.
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JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2025
·
IF 6.2
Yuyang Zhang,Tianjiao Han,Lan Zhang,Shuai Yun,Yue Yuan,Xiaoqin Wang,Linjuan Huang,Zhongfu Wang,Yu Lu
Goat lactoferrin is an N-glycoprotein, and its glycan moieties are essential for its biological activity. However, the structures of these glycans, particularly the sialylated isomers with α-2,3- or α-2,6-linkages, remain poorly characterized. Utilizing online hydrophilic liquid chromatography-tandem mass spectrometry, our study characterized N-glycans in goat lactoferrin across different lactation stages, and the putative structures of the 86 N-glycans of goat lactoferrin were presented, including 53 previously undetected ones. The content and variety of N-glycans decreased from colostrum to mature milk, with transitional milk exhibiting the highest levels of neutral and high-mannose N-glycans. Colostrum was particularly rich in fucose- and sialylated N-glycans, especially those with α-2,6-linkages. Notably, the α-2,6-linked sialylated N-glycan H5N4F1A1-1 was 7.09-fold and 12.85-fold more abundant in colostrum compared to transitional and mature milk, respectively. These findings provide valuable insights into the structure of lactoferrin and could facilitate the development of functional goat milk products.
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iScience
·
2024
·
IF 4.6
Jielin Huang,Jie Wang,Haonan Duan,Li Dong,Songsong Chen,Junping Zhang,Xiangping Zhang
Acidic and basic sites of catalysts are essential for CO 2 capture and activation. In this work, Zr, N-ZnO/ZnAl-LDH-IL composites in ionic liquid and methanol systems were fabricated, and applied to catalyze the synthesis of ethylene carbonate (EC) from ethylene glycol (EG) and CO 2 with about 4.76 mmol EC g Cat. −1 h −1 . The composites showed more strong basic sites due to the effective induction of reactive groups on the catalyst surface by Zr doping, resulting in an increase of pyridinic-N groups from 5.48% to 22.25%. More C atoms adjacent to pyridinic-N as strong basic sites was conducive to the activation of CO 2 and EG. In addition, the possible catalytic pathway and mechanism of the composites for synthesizing EC as well as the doping of La, Fe, Ce, and Cu were also investigated, which provides an effective strategy for regulating the acid-base centers on the catalyst surface through ionic liquids and methanol solvents.
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POLYMER INTERNATIONAL
·
2013
·Vol. 63
·期 3
·537-545
·
IF 2.125
Yewei Xu,Xiangwang Cui,Fanghua Zhu,Xuan Luo,Qiang Yin,Lin Zhang
Six new bis(benzimidazolyl) monomers containing ether, sulfonyl and ketone groups were synthesized efficiently. A series of poly( N -arylenebenzimidazole)s were prepared using an aromatic nucleophilic displacement reaction that removed the N–H sites from the novel bis(benzimidazolyl) derivatives with activated aromatic difluorides in sulfolane. The reaction was carried out at 210 °C in the presence of anhydrous potassium carbonate. All resulting polymers showed essentially amorphous patterns. This was consistent with the calculated results. Differential scanning calorimetry and thermogravimetric measurements showed that the polymers had high glass transition temperatures (>240 °C), good thermostability and high decomposition temperatures (>400 °C). These novel polymers also showed easy solubility. © 2013 Society of Chemical Industry
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JOURNAL OF PHYSICAL CHEMISTRY B
·
2010
·
IF 3.471
Shengtong Sun,Jun Hu,Hui Tang,Peiyi Wu
Two-dimensional correlation infrared spectroscopy (2DIR) and a newly developed perturbation correlation moving window (PCMW) technique were employed to study the precise chain collapse and revival thermodynamic mechanism of poly(N-isopropylacrylamide) (PNIPAM) hydrogel. Both Boltzmann fitting and PCMW had figured out the volume phase transition temperature for heating and cooling processes to be about 35 and 33.5 °C, respectively, close to the results obtained from DSC. Furthermore, determination of the isosbestic points for v(CH3) and v(C═O) overlaid spectra showed that the chain collapse of PNIPAM hydrogel took place along with some intermediate states or a completely continuous phase transition while the chain revival occurred with only conversion between two single states. Finally, 2Dcos discerned all the sequence of group motions of PNIPAM hydrogel, indicating that in the heating process, PNIPAM hydrogel occurred to collapse along the backbone before water molecules were expelled outside the network, while in the sequential cooling process, PNIPAM hydrogel had water molecules diffusing into the network first before the chain revival along the backbone occurred.
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JOURNAL OF POWER SOURCES
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2022
·
IF 9.794
Jian Feng,Shao-hua Luo,Yi-cheng Lin,Yang Zhan,Sheng-xue Yan,Peng-qing Hou,Qing Wang,Ya-hui Zhang
Engineering ideal anode materials with low cost, considerable reaction kinetics and good structural stability are urgently needed for sodium-ion batteries (SIBs) toward large-scale applications. Here, a hierarchical peapod-like nanorod consisting of CoSe 2 /N-doped carbon (NC) core-shell nanoparticles (NPs) embedded into one-dimensional (1D) N-doped carbon nanotubes (CoSe 2 /NC@NCNTs) with inner void space is developed and fabricated by a self-template, dopamine-coating, and succeeding selenization strategy. In the cleverly designed CoSe 2 /NC@NCNTs composite, the 1D peapod-like structure provides high mechanical strength and allows for fast mass transport/electron transfer. The external NCNTs and inner void space can effectively accommodate volumetric undulation and restrain the aggregation of CoSe 2 NPs. Based on these advantages, the CoSe 2 /NC@NCNTs electrode exhibits excellent comprehensive sodium storage performance, e.g., good rate capability (386.3 mAh g −1 at 10.0 A g −1 ) and high cycling stability (394.2 mAh g −1 up to 4500 loops at 5.0 A g −1 ). Moreover, the SIB full cells (Na 3 V 2 (PO 4 ) 3 @C cathodes vs CoSe 2 /NC@NCNTs anodes) can achieve a reversible capacity of 75.6 mAh g −1 total after 200 cycles at 0.5 A g −1 . This work provides a feasible avenue to construct stable energy-storage materials.
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JOURNAL OF MOLECULAR STRUCTURE
·
2013
·
IF 1.404
Yan Wang,Xihui Ge,Minqing Zhang,Huaigong Zhu,Zijian Zhang,Ming Wang
Growth characteristics of urea inclusion compounds with 1-decene, n-decane and mixture of 1-decene and n-decane (relative mass ratio = 1:1) were studied by CCD high-speed Camera. The present studies show that the speed of UICs growth in tunnel direction is faster than in vertical direction and the length of UICs with 1-decene is shorter than UICs with n-decane, and the length of UICs with mixture is between them due to the influence of the vinyl in 1-decene. The value of R = I (CH2)/ I (CH3) and M = I (CH CH2)/ I (CH3) in FTIR spectrum of UICs increasing with growth time demonstrates that urea prefers to include n-decane than 1-decene. 13 C CP/MAS NMR studies of UICs indicate that the arrangement of 1-decene in UICs is CH3⋯CH3 and CH CH2⋯CH2 CH. The arrangement of 1-decene in UICs leads to short chain of UICs with 1-decene in tunnel direction. The 13 C CP/MAS NMR spectra of UICs with MIX reveal that there are three different types of arrangement: CH3⋯CH3, CH CH2⋯CH3 and CH CH2⋯CH2 CH. The methods of FTIR and DSC were used to test the stability of UICs with different guests. The result shows that UICs with n-decane are stable than UICs with 1-decene. And the stability of UICs with mixture is in the middle.
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MICROCHEMICAL JOURNAL
·
2014
·
IF 3.583
Shengling Sun,Jie Li
A method has been developed for the determination of zirconium (Zr), hafnium (Hf), niobium (Nb), tantalum (Ta), molybdenum (Mo), tungsten (W), and tin (Sn) in seawater by quadrupole inductively coupled plasma-mass spectrometry (Q-ICP-MS). The method is based on separation of the seven elements by extraction chromatography using N-benzoyl-N-phenylhydroxylamine (BPHA) supported on a microporous acrylic ester polymeric resin. The optimized procedure indicates that the BPHA resin has high selective adsorption for Zr, Nb, Mo, Sn, Hf, Ta, and W (known as fluoride soluble elements), whereas other interference and matrix elements are minimally adsorbed. The optimized eluent mixture with their molarity gives satisfactory recoveries for all analytes. The recovery can be achieved 99% for Zr, 97% for Nb, 97% for Mo, 99% for Sn, 99% for Hf, 95% for Ta, and 98% for W, respectively, by eluting with 6 mL of 6 mol L − 1 HF/1 mol L − 1 HCl. Furthermore, the technique for separation and enrichment of these elements provides a low total method blank. The detection limits for this method are 0.5 ppt for Zr, 0.2 ppt for Nb, 1.7 ppt for Mo, 1.0 ppt for Sn, 0.1 ppt for Hf, 0.1 ppt for Ta, and 0.3 ppt for W, respectively. The validity of the method is evaluated by replicate analyses of seawater reference materials; the precision of the results is better than 3% (RSD, n = 4), and the results are in good agreement with certified values. The established procedure has proved to be both practical and effective for seawater sample analyses.
研究领域:
分析化学
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海洋化学
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环境地球化学
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痕量元素检测
·
质谱分析
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JOURNAL OF HAZARDOUS MATERIALS
·
2023
·
IF 13.6
Wen Song,Xinyu Xiao,Guanlong Wang,Xiaoli Dong,Xiufang Zhang
Supporting Fe catalysts on N doped carbon (Fe-N-C) renders a promising way towards peroxymonosulfate (PMS) activation for water decontamination , but constructing high-efficiency Fe-N-C remains challenging due to the insufficient understanding of the structure-performance relationship. Herein, the N doped carbon nanotube supported Fe catalysts (Fe-NCNT) were prepared towards PMS activation for organic pollutants removal, in which the Fe-N coordination number and Fe species were tuned through changing the pyrolysis temperature to study their roles in PMS activation. Results showed increasing the pyrolysis temperature converted the Fe-N 4 structure in Fe-NCNT to low-coordinated Fe-N 3 structure and produced Fe nanoparticles (FeNP, encapsulated in carbon). The Fe-NCNT with Fe-N 3 and FeNP exhibited a remarkably high specific activity (0.119 L min −1 m −2 ), which was 1.8 times higher than that of Fe-NCNT with only Fe-N 4 and obviously outperformed those of the state-of-the-art PMS activators. The low-coordinated structure and FeNP promoted the PMS reduction on Fe 2+ of Fe-N x for •OH and SO 4 •− production, which served as major oxidants for pollutants degradation . The experimental results and theoretical calculation corroborated the low-coordinated structure and FeNP jointly enhanced the PMS adsorption and electron density on Fe center, which accelerated electron transfer from Fe center to PMS for radical production.
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