JOURNAL OF NON-CRYSTALLINE SOLIDS
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2021
·
IF 3.531
Leibo Deng,Zhe Fu,Zhang Mingxing,Hao Li,Bin Yao,Jianli He,Hua Chen,Yonghong Ma
TiO 2 –ZrO 2 -codoped MgO–B 2 O 3 –Al 2 O 3 –SiO 2 glass-ceramics were prepared using the traditional melting method. The effects of replacing TiO 2 with ZrO 2 on the glass stability (GS), crystallization behavior, structures, and properties of the obtained samples were studied. Results showed that the addition of ZrO 2 increased the GS, which decreased the crystallization ability of the samples. When the heat treatment temperature was increased from 900 °C to 1000 °C, the mullite and quartz phases first precipitated in the glass matrix, and then converted into cordierite. Because of the low solubility of TiO 2 and ZrO 2 in this glass system, the rutile and zircon phases will precipitate from the parent glasses. Owing to changes in the composition and structure of the samples, the density and Vickers hardness increased, while the coefficient of thermal expansion of the samples first decreased and then increased when TiO 2 was replaced with ZrO 2 .
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JOURNAL OF POWER SOURCES
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2021
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IF 9.127
Yue Zhao,Huilian Hao,Tianliang Song,Xu Wang,Changwang Li,Wenyao Li
By combining the large power density of supercapacitors with the high energy density of ion batteries , a novel zinc-ion hybrid supercapacitor (ZHSC) is proposed and considered a promising candidate. But there are still challenges in the selection and application of reliable cathode materials . Herein, we used a mature and safe one-step hydrothermal method to synthesize N/P co-doped graphene (NPG), which exhibited a unique three-dimensional structure and a large specific surface area, showing great advantages as cathode to assemble Zn//NPG ZHSC with zinc foil. In the 1 M ZnSO 4 solution, the ZHSC shows superior electrochemical performance, which presents an excellent specific capacitance of 210.2 F g −1 under a wide working voltage of 1.8 V, and it achieves both a maximum energy density of 94.6 Wh kg −1 and a large power density of 4500 W kg −1 . More importantly, the capacitance retention rate remains 82% and a coulomb efficiency of ∼100% is achieved after 15,000 cycles. Overall, the results of this study highlight the efficient synthesis and excellent performance of NPG cathode materials, and also promote the rapid development and great application of high-performance Zn-ion hybrid capacitors.
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Nanomaterials
·
2021
·Vol. 12
·期 1
·41
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IF 5.076
Tong Yu,Chenpu Wu,Zhongyan Chen,Mingen Zhang,Zhuan Hong,Honghui Guo,Wenyao Shao,Quanling Xie
In this study, a novel photocatalytic self-cleaning nanofiltration (NF) membrane was fabricated by constructing aspartic acid-functionalized graphene quantum dots (AGQDs) into the polydopamine/polyethyleneimine (PDA/PEI) selective layer via the co-deposition method. The chemical composition, microstructure, and hydrophilicity of the prepared membranes were characterized by scanning electron microscopy (SEM), atomic force microscopy (AFM), attenuated total reflection (ATR-FTIR), X-ray photoelectron spectroscopy (XPS), and water contact angle (WCA). Meanwhile, the effects of PEI molecular weight and AGQDs concentration on NF membrane structures and separation performance were systematically investigated. The photocatalytic self-cleaning performance of the PDA/PEI/AGQDs membrane was evaluated in terms of flux recovery rate. For constructing high-performance NF membranes, it is found that the optimal molecular weight of PEI is 10,000 Da, and the optimal concentration of AGQDs is 2000 ppm. The introduction of hydrophilic AGQDs formed a more hydrophilic and dense selective layer during the co-deposition process. Compared with the PDA/PEI membrane, the engineered PDA/PEI/AGQDs NF membrane has enhanced water flux (55.5 LMH·bar−1) and higher rejection (99.7 ± 0.3% for MB). In addition, the PDA/PEI/AGQDs membrane exhibits better photocatalytic self-cleaning performance over the PDA/PEI membrane (83% vs. 69%). Therefore, this study provides a facile approach to construct a self-cleaning NF membrane.Keywords:nanofiltration;graphene quantum dots;L-aspartic acid;self-cleaning;co-deposition
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Crystals
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2021
·Vol. 11
·期 11
·1328
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IF 2.589
Daini Wang,Wenxia Wu,Xiaojun Tan,Bernard A. Goodman,Shoulei Xu,Wen Deng
As a development on previous research on single crystals of Pr3+-doped yttria-stabilized zirconia (YSZ), we report here the preparation and optical properties of Yb/Pr co-doped YSZ single crystals with different Yb2O3concentrations. Results from X-ray diffraction (XRD) and Raman spectroscopy indicated that all of the crystal samples had a cubic phase structure, and transmission was ≥88% in the 550–780 nm range. Photoluminescence (PL) under excitation with a 980 nm laser showed upconversion emission, and several peaks were observed centered on 448 nm, 508 nm, 525 nm, 542 nm, 617 nm and 656 nm. The effects of excited state absorption (ESA), energy transfer upconversion (ETU), cross relaxation (CR), and cooperative energy transfer (CET) on the upconversion luminescence and energy transition mechanism in YSZ crystals were further studied. The fluorescence lifetime of the3P0→3H5transition at 542 nm reached 207 μs, which shows that the samples are of potential use for laser and fluorescence output.Keywords:optical floating zone method;yttria-stabilized zirconia (YSZ) single crystal;Pr/Yb co-doped;upconversion luminescence
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ANALYTICA CHIMICA ACTA
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2021
·
IF 6.558
Xiangyu Ma,Kun Qian,Onome Ejeromedoghene,Martha Kandawa-Schulz,Wei Song,Yihong Wang
In this work, we report AuNPs-decorated pyrolyzed Co-BDC nanosheets (p-Co-BDC/AuNPs) as high-performance electrocatalyst for developing an electrochemical platform. p-Co-BDC/AuNPs as a new electrocatalyst showed superior electrocatalytic activity towards the electrochemical oxidation of methylene blue (MB). Besides, magnetic p-Co-BDC/AuNPs can be well immobilized on the magnetic glassy carbon electrode without further assistance. The oxidation of MB can be reduced by ascorbic acid . Inspired by this phenomenon, an electrochemical biosensor was constructed based on multiple signal amplification for the diagnosis of miRNAs . Firstly, p-Co-BDC/AuNPs enhanced the electrochemical oxidation of MB. Then, strand displacement amplification reaction can form lots of double helix structure DNA to embed more MB molecules. Finally, ascorbic acid in the electrolyte was utilized to reduce the oxidation of MB and improve the electrochemical signal of MB electro-oxidation. The linear detection range for the detection of miRNAs is 100 aM to 10 nM, and the limit of detection is 86 aM. Furthermore, the constructed biosensor also displayed satisfactory selectivity , good reproducibility, and excellent recovery in the detection of real samples. We are convinced that our proposed multiple signal amplification strategy will provide more promising methods for the diagnosis of cancer.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Huixin Wang,Wenshen Wang,Chengpan Li,Ao Xu,Bensheng Qiu,Fenfen Li,Weiping Ding
Microneedles (MNs) are an attractive strategy for the efficient, painless transdermal delivery of drugs with low systemic toxicity. In this work, a novel near-infrared (NIR) light-triggered separable microneedle system was fabricated to supply controlled chemo-thermal therapy to superficial tumors by co-loading a self-developed NIR-II fluorescence fluorophore Flav7 and the antitumor drug doxorubicin (DOX) in phase-change polycaprolactone (PCL) arrowheads on a soluble base. For the MNs we proposed, Flav7 offers MNs with NIR light-triggered heating generation and drug release properties as well as a NIR-II imaging ability for guiding combined chemo-thermal therapy, and the soluble supporting base ensures that the needle arrows are embedded in the skin after insertion and endows the MNs with a separation ability to reduce the contact time of the MNs with the skin. In vitro studies showed that Flav7 + DOX-loaded MNs exhibited adequate insertion abilities, stable thermal properties, and desirable light-activated melting effects and drug release capabilities. In vivo studies showed that the Flav7 + DOX-loaded MNs presented a remarkable NIR-II imaging ability, a good biosafety to the major organs, and a strong tumor-killing ability. It is worth noting that all of the treated breast cancer mice survived for 50 days without tumor recurrences or major organ damage. This study presented a promising MN system loaded with the multipurpose small molecule Flav7 that can be used for high-efficiency light-activated drug release for chemotherapy and high-performance light-controlled thermotherapy of tumors and also for remarkable NIR-II fluorescence imaging to guide chemo-thermal therapy.
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CHEMICAL ENGINEERING JOURNAL
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2021
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IF 13.273
Yang Yang,Yijin Shu,Yinqiong Wu,Qingsheng Gao
Noble-metal nanostructures are promising for biosensing applications owing to their fantastic physicochemical properties, but the rational design of their easy-accessible and reactive surface is still challenging. This work is devoted to the interfacial engineering of Ag-Pd alloys, including tuning alloy composition and geometric structure, to promote the electrochemical biosensing performance. Through a co-tuning tactic with controlled reduction, channel-rich Ag 1 Pd 3 alloys with optimal electronic configurations and accessible active surface are successfully obtained, which afford high sensitivity, outstanding selectivity and excellent repeatability to detect H 2 O 2 and glucose biomarkers. As experimentally and theoretically evidenced, tailoring the composition of Ag-Pd alloys ameliorates electronic configurations due to ligand effects, which can optimize the binding with the key intermediate of OH*, and thereby boost electrochemical kinetic steps on surface. Meanwhile, tuning geometric structure with abundant channels enables fast transport of analytes toward largely-exposed active sites. Providing an atomic-level interpretation of structure-dependent biosensing, this work is anticipated to offer guidelines for the development of efficient sensing platforms.
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ANALYTICAL AND BIOANALYTICAL CHEMISTRY
·
2021
·Vol. 413
·期 25
·6303-6312
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IF 4.157
Wan Hui,Cao Xiyue,Liu Min,Zhang Feifei,Sun Chao,Xia Jianfei,Wang Zonghua
To improve the efficiency of aptasensors, a signal amplification strategy by coupling tyrosinase (Tyr)–triggered redox cycling with nanoscale porous carbon (NCZIF) has been proposed. The NCZIF was obtained by calcining ZIF-8 crystals in an inert atmosphere. It had high surface areas, great biocompatibility, and ease of functionalization, which was beneficial for immobilizing sufficient Tyr and aptamer covalently. When the target prostate-specific antigen (PSA) was present, the NCZIF functionalized with Tyr and an aptamer bound to the aptamer-modified Au electrode specifically through the sandwich structure. Then, Tyr acted to oxidize the electroinactive phenol, which led to low-background signal, in the substrate to electroactive catechol, and triggered the redox cycling under the action of NADH. The low detection limit of the proposed electrochemical aptasensor for PSA was 0.01 ng mL −1 , and the wide detection range was from 0.01 to 50 ng mL −1 . The use of ZIF-8 derived porous carbon and Tyr-triggered redox cycling system provided a promising solution for the development of simple, rapid, reliable, and low-background aptasensing methods, which had great potential in the field of disease diagnosis and biomedicine. Graphical abstract
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OPTICAL MATERIALS
·
2021
·
IF 3.08
Peiyuan Zhu,Zhijun Zhu,Zhenhua Li,Yanan Xu,Laurence A. Belfiore,Jianguo Tang
Carbon dots with both red-emission and red-excitation (R-CDs) have attracted much attention due to their excellent optical property and promising application in various fields. However, most carbon dots (CDs) with red-emission are only excited with short wavelength irradiation, which heavily hinders their further applications. Herein, novel R-CDs are obtained through a hydrothermal synthesis by using p-phenylenediamine and ammonium thiocyanate as precursors. The as-synthesized R-CDs exhibit a strong red emission at 618 nm at a long excitation (598 nm). Moreover, the R-CDs are explored as a selective and sensitive “turn-off” sensor for Sn 2+ detection by the non-radiative recombination of the excitons through effective electron, charge or energy transfer between Sn 2+ and surface functional groups such as hydroxyl, carbonyl, amine, thiophene, and S O, with a detection range from 0 to 90 μM and a detection limit of as low as 17.25 nM.
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Food Packaging and Shelf Life
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2021
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IF 6.429
Jie Zhang,Chenglin Cao,Yibo Wang,Lan Xie,Wei Li,Baobi Li,Ruijie Guo,Hong Yan
Magnesium oxide (MgO)/ silver (Ag) nanoparticles (NPs) were synthesized and incorporated into poly(butylene succinate- co -terephthalate) (PBST) matrix to prepare PBST/MgO/Ag nanocomposite films by solvent casting. The effects of nanofillers on physical, antibacterial, and cherry tomato preservation properties of the PBST matrix were studied. The introduction of nanofillers effectively enhanced the thermal, mechanical, and barrier properties of the PBST matrix. Optimal properties were achieved by 3% (w/w) MgO/Ag NPs content. Their initial decomposition temperature, elongation at break, tensile strength, water vapor permeability, and oxygen transmission rate were 343.3 °C, 544.94 %, 31.57 MPa, 1.61 × 10 −11 g•m/m 2 •s•Pa, and 4.01 × 10 −11 Barrer, respectively. Owing to the enhanced antibacterial activities of the nanofillers, PBST/MgO/Ag possessed superior antibacterial activities against Gram-positive bacteria ( Staphylococcus aureus ) and Gram-negative bacteria ( Escherichia coli and Salmonella para-typhi B ). Cherry tomato preservation experiments proved the excellent preservation capability of PBST/MgO/Ag films. These findings indicated that the nanocomposites possessed potential prospects in packaging.
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JOURNAL OF MEMBRANE SCIENCE
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2021
·
IF 8.742
Lan Hao,Zexu Chi,Jianyou Wang
Hyperbranched polyethyleneimine (PEI) holds great potential for membrane-separation materials owing to the dendritic structure. However, their utilization in constructing antifouling anion exchange membranes (AEMs) remains significant challenge. Herein, a novel strategy of employing hyperbranched PEI to design antifouling AEMs was demonstrated. Hyperbranched PEI and dopamine were co-deposited on the surface of AEMs to prepare antifouling AEMs. Dopamine can easily form polydopamine (PDA) and enhance the hydrophilicity and electronegativity of membrane surface. The hydrophilic and electronegative membrane surface enabled the ability to block foulants, endowing the AEMs with improved antifouling performance. Meanwhile, the dendritic structure of hyperbranched PEI tended to assemble the low-barrier pathway for ion transport and maintained the desalination performance of AEMs. Thus, the obtained PEI-1800&PDA/AEM achieved 1.93 times variation of the electrical conductivity for diluted solution of commercial AEM after antifouling experiment, while the variation is close to that of commercial AEM after desalination experiment. This study offers new insight into fabricating hyperbranched PEI-based membranes for high-performance materials.
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CHINESE JOURNAL OF CATALYSIS
·
2021
·
IF 8.271
Dongdong Wang,Wanbing Gong,Jifang Zhang,Miaomiao Han,Chun Chen,Yunxia Zhang,Guozhong Wang,Haimin Zhang,Huijun Zhao
Catalytic hydrodeoxygenation (HDO) is one of the most promising strategies to transform oxygen-rich biomass derivatives into high value-added chemicals and fuels, but highly challenging due to the lack of highly efficient nonprecious metal catalysts. Herein, we report for the first time of a facile synthetic approach to controllably fabricate well-defined Ni-Co alloy NPs confined on the tip of N-CNTs as HDO catalyst. The resultant Ni-Co alloy catalyst possesses outstanding HDO performance towards biomass-derived vanillin into 2-methoxy-4-methylphenol in water with 100% conversion efficiency and selectivity under mild reaction conditions, surpassing the reported high performance nonprecious HDO catalysts. Impressively, our experimental results also unveil that the Ni-Co alloy catalyst can be generically applied to catalyze HDO of vanillin derivatives and other aromatic aldehydes in water with 100% conversion efficiency and over 90% selectivity. Importantly, our DFT calculations and experimental results confirm that the achieved outstanding HDO catalytic performance is due to the greatly promoted selective adsorption and activation of C=O, and desorption of the activated hydrogen species by the synergism of the alloyed Ni-Co NPs . The findings of this work affords a new strategy to design and develop efficient transition metal-based catalysts for HDO reactions in water.
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