INORGANIC CHEMISTRY
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2020
·
IF 4.825
Haonan Liu,Hongping Wu,Hongwei Yu,Zhanggui Hu,Jiyang Wang,Yicheng Wu
Mo(VI)-containing phosphates are widely used in catalyses, ion batteries, and nonlinear optical (NLO) crystals. However, few strategies can effectively guide the syntheses of the Mo(VI)-containing phosphates. In this paper, three new Mo(VI)-containing phosphates, Cs3Mo12PO40, LiK(MoPO6)2, and Sr(MoPO6)2, with different dimensions have been successfully synthesized by adjusting the Mo/P ratios. Interestingly, Cs3Mo12PO40 is a classic Keggin-type polyoxometalate composed of zero-dimensional (0D) [Mo12PO40]3– clusters, whereas LiK(MoPO6)2 and Sr(MoPO6)2 have three-dimensional (3D) [MoO2O4P]∞ frameworks consisting of MoO6 octahedra and PO4 tetrahedra in a 1/1 ratio. Detailed structural comparisons of Mo(VI)-containig phosphates indicate that the Mo/P ratios have a significant effect on the structural dimensions. Further, the optical properties and thermal stabilities of Cs3Mo12PO40, LiK(MoPO6)2, and Sr(MoPO6)2 are also determined.
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高影响因子
COLLOID AND POLYMER SCIENCE
·
2020
·Vol. 298
·期 6
·629-636
·
IF 1.536
Yang Xu,Li Wenbo,Sun Zhaojie,Yang Chunhui,Tang Dongyan
In this work, pH/temperature dual-sensitive polymers of P(NVCL-co-MAA) with the increased low critical solution temperature (LCST) values of about 37 °C that differed from that of ~ 32 °C of pure poly(N-vinyl caprolactam) (PNVCL) were synthesized via radical polymerization. Then the nanofibers of P(NVCL-co-MAA) and its cospinned nanofibers with nifedipine (NIF) as drug model were fabricated by electrospinning method. Structures and the interactions within the components were detected by FT-IR, NMR, and XPS methods. The dual-responsive properties and the controlling release of the drug were investigated by water contact angle tests and in vitro drug release tested by UV-vis spectrophotometer. SEM was conducted to demonstrate the morphology of the nanofibers and the obvious improved stabilized morphology of the modified system within the aqueous media. The maintained morphology within the media and the obvious elongated releasing period of over 150 min at 37 °C and with pH of 1.99 both proved the promising prospects of the fabricated nanofibers as excellent carrier in drug delivery system.
Graphical abstract
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CHEMICAL ENGINEERING JOURNAL
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2020
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IF 10.652
Ce Gao,LingPing Xiao,Jinghui Zhou,Haisong Wang,Shangru Zhai,Qingda An
A new type of nanosilver immobilized catalyst based on glycine modified lignin hydrogels with excellent catalytic performance towards p -nitrophenol reduction have been prepared. Glycine was used to provide amino and carboxy groups for complexing silver ions, simultaneously which was also beneficial for in-situ reduction and suppression of silver nanoparticles. As-prepared composites were characterized by X-ray diffraction, scanning electron microscope with EDS, high-resolution transmission electron microscope, X-ray photoelectron spectroscopy, Fourier Transform Infrared Spectrometer and Thermal Gravimetric Analyzer. The developed network with enriched anchoring sites could provide the stability during the catalytic process and enough traction to disperse and stabilize the silver nanoparticles. Batch experiments of 4-NP hydrogenation were carried out to correlate the catalytic performance. The concentration of 4-NP of 5 mmol/L could be finished with only 101 s and the rate of k was 0.0151 s −1 . Moreover, fixed-bed experiments were creatively applied for the tests and the catalyst can maintain high efficiency about 300 min with the flowing rate of 3 mL/min. After being reused ten cycles, the catalyst retained the conversion rate beyond 98%; and the structure has no obvious deterioration and the leaching of nanosilver was neglectful, which could be attributed to the crucial role of introduced glycine component.
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Nanoscale
·
2020
·Vol. 12
·期 27
·14863-14869
·
IF 6.895
Shuli Yin,You Xu,Songliang Liu,Hongjie Yu,Ziqiang Wang,Xiaonian Li,Liang Wang,Hongjing Wang
The development of doped noble metal catalysts with nonmetal elements to improve the catalytic performance toward the oxygen reduction reaction (ORR) is significant for proton exchange membrane fuel cell technology. Here, we report a one-pot for dual-nonmetal-doping strategy for the synthesis of S and P-co-doped mesoporous PtPd nanocages (PtPdSP mNCs) by using pre-synthesized mesoporous PtPd nanocages (PtPd mNCs) as the precursor and triphenylphosphine sulphide as both S and P sources. Benefitting from the combined advantages of metal–nonmetal incorporation, hollow cavity and surface porosity, the resultant quaternary PtPdSP mNCs exhibit outstanding ORR activity and long-term stability. This research work provides a good strategy for the doping of two or more selected nonmetallic elements into metallic nanocrystals with a controllable structure and composition.
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高影响因子
International Journal of Nanomedicine
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2020
·
IF 5.115
Gaofeng Liang,Hao Shi,Yijun Qi,Jinghua Li,Aihua Jing,Qiwei Liu,Wenpo Feng,Guangda Li,Shegan Gao
Introduction Biofilms protect bacteria from antibiotics and this can produce drug-resistant strains, especially the main pathogen of periodontitis, Porphyromonas gingivalis. Carbon quantum dots with various biomedical properties are considered to have great application potential in antibacterial and anti-biofilm treatment.Methods Tinidazole carbon quantum dots (TCDs) and metronidazole carbon quantum dots (MCDs) were prepared by a hydrothermal method with the clinical antibacterial drugs tinidazole and metronidazole, respectively. Then, TCDs and MCDs were characterized by transmission electron microscopy, UV–visible spectroscopy, infrared spectroscopy and energy-dispersive spectrometry. The antibacterial effects were also investigated under different conditions.Results The TCDs and MCDs had uniform sizes. The results of UV–visible and energy-dispersive spectrometry confirmed their important carbon polymerization structures and the activity of the nitro group, which had an evident inhibitory effect on P. gingivalis, but almost no effect on other bacteria, including Escherichia coli, Staphylococcus aureus and Prevotella nigrescens. Importantly, the TCDs could penetrate the biofilms to further effectively inhibit the growth of P. gingivalis under the biofilms. Furthermore, it was found that the antibacterial effect of TCDs lies in its ability to impair toxicity by inhibiting the major virulence factors and related genes involved in the biofilm formation of P. gingivalis, thus affecting the self-assembly of biofilm-related proteins.Conclusion The findings demonstrate a promising new method for improving the efficiency of periodontitis treatment by penetrating the P. gingivalis biofilm with preparations of nano-level antibacterial drugs.
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高影响因子
APPLIED ORGANOMETALLIC CHEMISTRY
·
2020
·Vol. 34
·期 11
·e5932
·
IF 3.14
Yanming Jia,Junwen Wang,Kan Zhang,Chuanmin Ding
A highly shape-selective and relatively long-lifetime HZSM-5-based catalyst (Zn-2P/HZSM-5) was prepared by chemical modification with both ZnSiF 6 ·6H 2 O and H 3 PO 4 solution. The phosphoric acid modification could effectively modulate the Brønsted acid strength of the HZSM-5 catalyst, which promotes the oligomerization, alkylation, cyclization, and hydrogen transfer reactions. The introduction of Zn-Lewis acid sites significantly improved the dehydroaromatization of higher olefins. All of these were very beneficial for the generation of BTX (i.e. b enzene, t oluene, and x ylene) hydrocarbons in aromatization of methanol. The coke amount and the average rate of coke formation decreased over the Zn-2P/HZSM-5 catalysts, which may largely be ascribed to its lower strong acid sites and lower outer surface acidity. The catalytic performance of methanol aromatization showed that the Zn-2P/HZSM-5 catalyst exhibited the highest BTX selectivity of about 46.76% and the longest catalytic lifetime of about 498 h at T = 400 °C, P = 0.1 MPa, and weight hourly space velocity = 0.7 h −1 .
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高影响因子
TALANTA
·
2020
·
IF 5.339
Na An,Quan-Fei Zhu,Lei Yu,Yong-Ting Chen,Sheng-Li Chen,Yu-Qi Feng
In this study, a derivatization-assisted pseudo -multiple reaction monitoring with high CID voltage (HV- p -MRM) strategy was proposed for the analysis of brassinosteroids (BRs) by liquid chromatography-triple quadrupole mass spectrometry (LC-QqQ MS). The concept of the HV- p -MRM strategy was proposed on the basis of an assumption that the precursor ion of analyte is stable in collision cell and less prone to fragmentation at high CID voltage, while co-existing ions (impurity) of easy fragmentation can break down into smaller fragment ions. In such case, by increasing the CID voltage, the co-existing ions that are introduced due to the low resolution of the quadrupole 1 (Q1) can be filtered out by quadrupole 3 (Q3), while the stable precursor ion of analyte will pass through Q3, thereby that the signal-to-noise ratio (S/N) of the analysis can be improved. As a proof-of-concept study, BRs were derivatized with rhodamine B-boronic acid (RhB-BA) and then the derivatives were used to investigate their variations in MS signal, background noise, and S/N upon the CID voltage and MS scanning resolution. The results showed that S/N of these derivatives can be improved in HV- p -MRM mode. To further demonstrate the feasibility of HV- p -MRM strategy, a RhB-BA derivatization assisted LC-HV- p -MRM-MS method was developed for the analysis of BRs. Using this method, rapid and sensitive determination of BRs in different organs of rape flower was achieved. It can be expected that HV- p -MRM may be suitable for the analytes that are stable or can be converted into compounds of high stability in collision cell at high CID voltage.
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INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
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2019
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IF 3.375
Wei Du,Longjing Bai,Yue Gong,Lei Zhang,Jun Xiang,Songbo Wang,Na Tang,Liang Zhu,Qiuxiang Yin
The homogeneous nucleation during fast cooling crystallization and the heterogeneous nucleation during the solution-mediated polymorphic transformation (SMPT) of p-nitrobenzoic acid (PNBA) were investigated to elucidate the connection between the molecular self-assembly and the nucleation process. Process analytical technology (PAT) tools, such as attenuated total reflection-Fourier-transform infrared (ATR-FTIR) spectroscopy were successfully applied to highlight the existence of solution-phase dimers and monomers. The combination of solubility measurements, measured nucleation induction time, polymorphic outcome and transformation, and computational chemistry was used to demonstrate the connection among solvation, molecular self-assembly in solution, and the nucleation pathway of PNBA. The orders of solubility and nucleation rates in different solvents were found to be consistent with those of solute–solvent binding energies. The dimerization of PNBA molecules in hydrogen-bonded dimers and stacked dimers through π–π interactions seem similar in all four solvents investigated in this study, which indicates that the desolvation of PNBA is the key step during the overall nucleation pathway.
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高影响因子
JOURNAL OF ELECTROANALYTICAL CHEMISTRY
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2019
·
IF 3.218
Jinghua Shang,Minggang Zhao,Huiyan Qu,Hui Li,Rongjie Gao,Shougang Chen
The 3D Ni/NiO/MoO 3 /chitosan foam was fabricated and the interfacial barrier of p-n junction was proposed as a driving factor for electrochemical detection of Cu 2+ . The electrochemical response resulted from the decreased barrier height caused by the absorbed Cu 2+ . The liner range (0–25 μM) and the lower detection limit (5.69 nM) were obtained. The direct electrochemical detection of Cu 2+ in real water sample with excellent stability and recovery was achieved. It affords a new approach to achieve the direct electrochemical detection of metal ions with depressed interference by employing the interfacial effects of p-n junction.
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高影响因子
CARBOHYDRATE POLYMERS
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2019
·
IF 6.044
Maruthupandy Muthuchamy,Rajivgandhi Govindan,Kadaikunnan Shine,Veeramani Thangasamy,Naiyf S. Alharbi,Muneeswaran Thillaichidambaram,Jamal M. Khaled,Jun-Li Wen,Khalid F. Alanzi
In this study graphene/chitosan nanoparticles (GR/CS NCs) were developed. The homogenous combination of GR and CS was confirmed by FTIR spectroscopy. The combination of CS with GR sheets reduced the XRD intensity of the GR peak in GR/CS NCs, while TEM images revealed the immobile CS coating of GR sheets. Further, the anti-biofilm activity of GR/CS NCs was tested. The tests showed that the formation of biofilm by Pseudomonas aeruginosa and Klebsiella pneumoniae was inhibited at 40□g/mL GR/CS NCs up to 94 and 92 %, respectively. The intracellular and cell surface damage of the bacteria was observed by CLSM and SEM. Also, GR/CS NCs produced a toxic effect of 90 % on Artemia franciscana at 70□g/mL upon 24 h incubation. The recorded properties of the synthesized GR/CS NCs qualify them as potential agents against multi-drug resistant bacteria.
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高影响因子
OPTICAL MATERIALS
·
2019
·
IF 2.687
Jing Fang,Shujuan Zhuo,Changqing Zhu
In this study, we presented a facile strategy to synthesis Cu-doped carbon dots (Cu-CDs) through one-step hydrothermal approach using CuCl 2 ·2H 2 O and ethanediamine as reaction precursor. Interestingly, the fluorescence of Cu-CDs can be quenched greatly in the presence of p -nitrophenol. Thus, a high selectivity and sensitivity fluorescent sensing platform is constructed for the detection of p -nitrophenol on account of the inner filter effect . Under the optimal condition, the linear detection range is 0.5–50 μM with the detection limit of 0.08 μM (S/N = 3). This method is successfully applied in quantification of p -nitrophenol in lake water samples, which exhibits potential application prospect.
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高影响因子
ChemNanoMat
·
2022
·Vol. 9
·期 1
·e202200400
·
IF 3.82
Bo Zhu,Xu Lu,Jiadang Li,Wenhao Xie,Lifei Wang,Qiang Zhang,Jianfeng Fan,Yun Zheng
Graphical The substitution of iso-valent Bi for Sb is adopted to adjust the thermoelectric transport properties of the undoped Mg 3 Sb 2 compound. The improved power factor and figure of merit are obtained accordingly. Bismuth is the most common alloying element for high-performance Mg 3 Sb 2 -based thermoelectric compounds. However, the electrical and thermal transport data is lacking for undoped Mg 3 (Sb, Bi) 2 solid solutions. In this study, theoretical calculation results show that Bi alloying can reduce the band gap of Mg 3 Sb 2 , favoring the regulation of carrier concentration. Both Mg 3 Sb 2 and Mg 3 SbBi compounds present a single band structure on the valence band maximum at Γ of the Brillouin zone. Incorporating the Bi element can slightly increase the density of states (DOS) on the valence band maximum, which is beneficial for the Seebeck coefficient. Mg 3 Sb 2-x Bi x (0≤x≤0.8) compounds were experimentally prepared via ball milling (BM) combined with the spark plasma sintering (SPS) technique. The carrier concentration, electrical conductivity, and power factor of the samples tend to increase with the increasing Bi content. Bismuth alloying significantly reduces the total thermal conductivity in the low-temperature range, with the lowest value of 0.65 Wm −1 K −1 obtained at ∼400 K for the x=0.2 sample. The peak ZT value of 0.077 at 800 K and the average ZT of 0.051 in the temperature range of 450–800 K are obtained for the x=0.2 sample, which is 93% and 219% higher than those of the unalloyed sample, respectively. This work reveals the Bi-alloying induced transport mechanism and provides fundamental thermoelectric data regarding the undoped Mg 3 Sb 2-x Bi x (0≤x≤0.8) solid solutions.
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