PLASMA CHEMISTRY AND PLASMA PROCESSING
·
2023
·Vol. 43
·期 6
·1963-1978
·
IF 3.6
Lv Huan,Liu Xinyuan,Hao Yingzi,Yi Yanhui
The industrial utilization of methane to methanol is based on the indirect pathway with syngas as an intermediate product, but the reaction conditions are very harsh and the costs in equipment and operations are extremely high. Therefore, the direct oxidation of methane to methanol (DOMTM) under mild conditions is more desirable. In this paper, coupling of non-thermal plasma and Cu–zeolite (Cu–ZSM-5 and Cu–S-1) catalysts have been studied for DOMTM. The effect of Si/Al ratios (Cu–ZSM-5 and Cu–S-1 catalysts) on the reaction performance has been investigated. Cu–S-1 catalyst exhibited the best catalytic performance, i.e., 5.8% methane conversion and 50.6% methanol selectivity. The employed catalysts have been characterized by XRD, UV–Vis, XPS and FT-IR. The results show that Cu–ZSM-5 catalysts with high Si/Al ratio are conducive to the formation of isolated Cu 2+ species, and Cu–S-1 catalyst exhibits the most abundant isolated Cu 2+ species. Furthermore, Cu–S-1 catalyst shows the most abundant O ads species. The plentiful surface silicon defects on S-1 is the reason why Cu–S-1 catalyst shows the most abundant isolated Cu 2+ and O ads species, and these two species are interdependent to form a Si–O–Cu species, which may be the active site for DOMTM. Based on these findings, the possible catalytic mechanism was proposed.
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CHINESE JOURNAL OF POLYMER SCIENCE
·
2023
·Vol. 41
·期 8
·1305-1316
·
IF 4.3
Chen Hao,Chu Fang-Yuan,Zhuang Hai-Yan,Wang Lu,Ye Zhi-Min,Dong Wei,Xie Zhi-Peng,Xie A.-Ming
Conjugated microporous polymers have excellent skeleton structures but poor electrical conductivity limits their applications in microwave absorption. To solve this problem, a strategy of molecular expansion and confining polymerization is proposed in this work to synthesize conductive hyper-crosslinked conjugated microporous polymer. The topology of the conjugated microporous polymer is changed into a three-dimensional skeleton structure with high specific surface area by using molecular expansion technique, and the controlled growth of polypyrrole in the channel constructs a unique network structure. The balance of excellent composite backbone structure, proper conductivity, attenuation capability and impedance matching enable the material to exhibit electromagnetic wave absorption performance. As a result, with low filler loading of 10 wt%, a strongest reflection loss of −52.68 dB and a maximum effective bandwidth of 5.76 GHz. Additionally, CST simulations of the radar scattering cross section have been carried out to verify the excellent material properties. This study provides new concepts for new conductive polymers and broadens the application of hyper-crosslinked conjugated microporous polymer in the field of electromagnetic wave absorption.
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ACTA PHARMACOLOGICA SINICA
·
2021
·Vol. 43
·期 7
·1749-1757
·
IF 6.15
Li Dan,Ding Jin,Liu Te-li,Wang Feng,Meng Xiang-xi,Liu Song,Yang Zhi,Zhu Hua
The spike protein of SARS-CoV-2 interacts with angiotensin-converting enzyme 2 (ACE2) of human respiratory epithelial cells, which leads to infection. Furthermore, low-dose radiation has been found to reduce inflammation and aid the curing of COVID-19. The receptor binding domain (RBD), a recombinant spike protein with a His tag at the C-terminus, binds to ACE2 in human body. We thus constructed a radioiodinated RBD as a molecule-targeted probe to non-invasively explore ACE2 expression in vivo, and to investigate radiotherapy pathway for inhibiting ACE2. RBD was labeled with [ 124 I]NaI using an N-bromosuccinimide (NBS)-mediated method, and 124 I-RBD was obtained after purification with a specific activity of 28.9 GBq/nmol. Its radiochemical purity was (RCP) over 90% in saline for 5 days. The dissociation constant of 124 I-RBD binding to hACE2 was 75.7 nM. The uptake of 124 I-RBD by HeLa ACE+ cells at 2 h was 2.96% ± 0.35%, which could be substantially blocked by an excessive amount of RBD, and drop to 1.71% ± 0.23%. In BALB/c mice, the biodistribution of 124 I-RBD after intravenous injection showed a moderate metabolism rate, and its 24 h-post injection (p.i.) organ distribution was similar to the expression profile in body. Micro-PET imaging of mice after intrapulmonary injection showed high uptake of lung at 1, 4, 24 h p.i.. In conclusion, the experimental results demonstrate the potential of 124 I-RBD as a novel targeted molecular probe for COVID-19. This probe may be used for non-invasive ACE2 mapping in mammals.
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JOURNAL OF POLYMER RESEARCH
·
2021
·Vol. 28
·期 12
·1-13
·
IF 3.097
Sun Chenkai,Yin Hai,He Junwei,Zou Liming,Xu Yongjing
Abstract On basis of the difficulty in fabricating natural-polymer nanofibers by electrospinning with common solvents, in this paper, gelatin/chitosan (CS)-Poly (ethylene oxide) (PEO) electrospun membranes at different weight ratios (9/1, 8/2, 7/3, 6/4) were successfully fabricated with 50% (v/v) acetic acid solution as solvent. Moreover, the relationship between different fiber components and the properties of as-spun membranes has been studied. All electrospun membranes were characterized by scanning electron microscopy, Fourier transform infrared, X-ray diffraction, thermogravimetric analysis, differential scanning calorimetry, porosity, contact angle, water swelling rate, water vapor transmission rate, mechanical properties, and in vitro degradation behavior. The results demonstrated that all electrospun membranes were consisted of uniform, bead-free fibers, and the average fiber diameter and porosity were 390-600 nm and 80-90%, respectively. The crystallinity of gelatin/CS-PEO electrospun membranes gradually increased with the increasing content of PEO. Besides, the water contact angle, water swelling ratio, water vapor transmission rate, and in vitro degradation behavior of gelatin/CS-PEO electrospun membranes were 29°-37°, 260-410%, 580-657 g·m −2 ·day −1 , and 79-91%, respectively. Moreover, the mechanical properties showed that the tensile strength, Young’s modulus, and elongation at break were 0.76-1.70 MPa, 21.0-31.7 MPa, and 22.3-27.4%, respectively. In particular, gelatin/CS-PEO electrospun membranes 7/3 have excellent properties comparing with others, showing the great potential application as dermis scaffold in skin regeneration.
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CELLULOSE
·
2021
·Vol. 29
·期 2
·1175-1187
·
IF 5.044
Cheng Wei,Liu Wenjing,Wang Qiang,Wang Ping,Zhou Man,Yu Yuanyuan
Antibacterial textiles cannot prevent the dirty liquid containing bacteria from passing through the fabrics to reach the human skin, and cannot effectively protect human health. To enhance the antibacterial function of the fabric, a dual-function cotton fabric with hydrophobic and antibacterial properties, cotton@PDA@AgNPs@ODA, was prepared via in situ surface assembly of polydopamine (PDA), Ag nanoparticles (AgNPs) and octadecylamine (ODA). Polydopamine (PDA) was deposited on raw cotton fabric. AgNPs were introduced to the surface PDA coating of the fabric by in situ reduction of AgNO 3 with reducibility of catechol moieties in PDA. Subsequently, octadecylamine (ODA) was grafted onto PDA by Michael addition/Schiff base reaction. Water contact angle of Cotton@PDA@AgNPs@ODA was 130° at 10 min of drop contact time, showing good hydrophobicity. The antibacterial rates of Cotton@PDA@AgNPs@ODA against Escherichia coli and Staphylococcus aureus were above 99%, and the modified fabric had good bacterial liquid shielding function. Furthermore, the PDA/AgNPs/ODA coating had good fastness under washing, mechanical abrasion and strong acid/alkaline conditions.
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JOURNAL OF NANOBIOTECHNOLOGY
·
2021
·Vol. 19
·期 1
·1-14
·
IF 10.435
Wei Zhuxin,Duan Guangxin,Huang Baoxing,Qiu Shanshan,Zhou Dandan,Zeng Jianfeng,Cui Jiabin,Hu Chunhong,Wang Ximing,Wen Ling,Gao Mingyuan
Background Fluorescence imaging as the beacon for optical navigation has wildly developed in preclinical studies due to its prominent advantages, including noninvasiveness and superior temporal resolution. However, the traditional optical methods based on ultraviolet (UV, 200–400 nm) and visible light (Vis, 400–650 nm) limited by their low penetration, signal-to-noise ratio, and high background auto-fluorescence interference. Therefore, the development of near-infrared-II (NIR-II 1000–1700 nm) nanoprobe attracted significant attentions toward in vivo imaging. Regrettably, most of the NIR-II fluorescence probes, especially for inorganic NPs, were hardly excreted from the reticuloendothelial system (RES), yielding the anonymous long-term circulatory safety issue.Results Here, we develop a facile strategy for the fabrication of Nd3+-doped rare-earth core–shell nanoparticles (Nd-RENPs), NaGdF4:5%Nd@NaLuF4, with strong emission in the NIR-II window. What’s more, the Nd-RENPs could be quickly eliminated from the hepatobiliary pathway, reducing the potential risk with the long-term retention in the RES. Further, the Nd-RENPs are successfully utilized for NIR-II in vivo imaging and magnetic resonance imaging (MRI) contrast agents, enabling the precise detection of breast cancer.Conclusion sThe rationally designed Nd-RENPs nanoprobes manifest rapid-clearance property revealing the potential application toward the noninvasive preoperative imaging of tumor lesions and real-time intra-operative supervision.Graphical abstract
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Scientific Reports
·
2021
·Vol. 11
·期 1
·1-10
·
IF 4.38
Zhang Xiaofang,Wang Liuyang,Liu Chunqin,Liu Yongqiang,Mei Xiangdong,Wang Zhongyue,Zhang Tao
The white-spotted flower chafer (WSFC), Protaetia brevit arsis Lewis, is native to East Asia. Although their larvae are considered a potential resource insect for degrading plant residues, producing protein fodder, and processing to traditional medicine, adult WSFCs inflict damage to dozens of fruit and economic crops. The control of the WSFC still relies heavily on pesticides and the inefficient manual extraction of adults. Here, we report the identification and evaluation of the aggregation pheromone of WSFCs. From the headspace volatiles emitted from WSFC adults, anisole, 4-methylanisole, 2-heptanone and 2-nonanone were identified as WSFC-specific components. However, only anisole and 4-methylanisole elicited positive dose–response relationship in electroantennography tests, and only 4-methylanisole significantly attracted WSFCs of both sexes in olfactometer bioassays and field experiments. These results concluded that 4-methylanisole is the aggregation pheromone of WSFCs. Furthermore, we developed polyethylene vials as long-term dispensers of 4-methylanisole to attract and kill WSFCs. The polyethylene vial lures could effectively attracted WSFCs for more than four weeks. Pheromone-based lures can be developed as an environmentally friendly protocol for monitoring and controlling WSFC adults.
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JOURNAL OF APPLIED ELECTROCHEMISTRY
·
2021
·Vol. 52
·期 3
·573-581
·
IF 2.8
Zhao Ruiyu,Wang Yi Mou,Li Jie,Meng Wenhua,Yang Chunli,Sun Chongxiang,Lan Xuefang
Ni, Ce, and Ta modified Ti/SnO 2 –Sb 2 O 5 –RuO 2 anodes were first prepared by thermal decomposition strategy and applied for Orange G degradation to explore the effect of Ni, Ce, and Ta modification on electrocatalytic property. The Ta modified anode showed the highest ·OH generation capability and the lowest charge transfer resistance among all samples, conducive to electrocatalytic degradation of Orange G. Besides, the Ta modified anode shows more cracks than Ni and Ce modified anodes, which is expected to create more specific surface areas and more exposed active sites for Orange G degradation. The degradation efficiency and the total organic carbon (TOC) removal rate increased in the order Ru < Ru–Ni < Ru–Ce < Ru–Ta, with Ru–Ta showing the highest degradation efficiency of 98.6% and 44.2%, much higher than 79.6% and 27.5% of Ru, respectively.
Graphical abstract
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MICROCHIMICA ACTA
·
2021
·Vol. 189
·期 1
·1-9
·
IF 5.833
Yang Dezhi,Li Qiulan,Zhang Qian,Wang Yijie,Li Hong,Tammina Sai Kumar,Yang Yaling
An Au-based nanozyme composite (AuNPs/Cu,I) was constructed by using Cu,I-doped carbon dots (Cu,I-CDs) as the reducing agent as well as the nanozyme. Notably, AuNPs/Cu,I nanozyme not only possessed the intrinsic activity of mimicking enzymes of superoxide dismutase, peroxidase, and catalase at different conditions but was also employed as surface-enhanced Raman spectroscopy (SERS) enhancer. The combination of Cu,I-CDs and AuNPs promoted the electron transferability, leading to increased peroxidase-like activity and superoxide-like activity. Compared to the individual Cu,I-CDs and AuNPs nanozyme, the AuNPs/Cu,I composite demonstrated promising peroxidase-like activity by transferring electrons instead of generating OH. Interestingly, the multienzyme-like activity of AuNPs/Cu,I nanozyme could be finely tuned by changing the composition of Cu 0 /Cu + and Au. The tert -butyl hydroquinone (TBHQ) as the substrate could be catalyzed with AuNPs/Cu,I nanozyme to produce red substances, resulting in a significant Raman enhancement effect at the same time, showing good linear range from 0.11 to 10 mg L −1 . Overall, the current investigation provides a flexible and controllable way to design multifunctional nanozymes along with the Raman enhancement strategy based on the catalysis of nanozyme. Graphical abstract
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Chinese Journal of Integrative Medicine
·
2021
·Vol. 28
·期 10
·909-917
·
IF 1.978
Yue Wu-heng,Qin Lan-qun,Cai Juan,Mei Rui,Qian Han-qing,Zou Zheng-yun
Objective To verrify the anti-tumor efficacy and toxicity between juglone (Jug) and Jug-loaded PLGA nanoparticles (Jug-PLGA-NPs). Methods Jug-PLGA-NPs were prepared by ultrasonic emulsification. The anti-tumor activity of Jug (2, 3, 4 µg/mL) and Jug-PLGA-NPs (Jug: 2, 3, 4 µg/mL) in vitro was measured by MTT assay and cell apoptosis analysis. The distribution, anti-tumor effect and biological safety in vivo was evaluated on A375 nude mice. Results With the advantage of good penetration and targeting properties, Jug-PLGA-NPs significantly inhibited proliferation and migration of melanoma cells both in vitro and in vivo ( P <0.05 or P <0.01) with acceptable biocompatibility. Conclusions Jug can inhibit the growth of melanoma but is highly toxic. With the advantage of sustained release, tumor targeting, anti-tumor activity and acceptable biological safety, Jug-PLGA-NPs provide a new pharmaceutical form for future application of Jug.
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MICROCHIMICA ACTA
·
2021
·Vol. 189
·期 1
·1-11
·
IF 5.833
Shen Yanting,Zhao Yuhui,Zhu Yanyan,Wang Jing
A novel colorimetric/fluorescent dual-mode nanosensor for Hg 2+ detection was constructed using expanded mesoporous silica (EMSN)-encapsulated ultrasmall platinum nanoclusters (EMSN@Pt NCs) with improved peroxidase-like and stable fluorescent activities. The sensing technique was based on the mechanism that the peroxidase mimetic activity and fluorescence intensity of EMSN@Pt NCs can be inhibited in the presence of Hg 2+ . In this sensing platform, a linear range of 5–50 nM with a detection limit of 1.78±0.38 nM and quantification limit of 5.93 nM was obtained via fluorescent analysis. A linear calibration curve from 0.25 to 200 nM with a detection limit of 8.25±0.51 nM and quantification limit of 27.47 nM was achieved via colorimetric analysis. The proposed dual-mode probe possesses excellent selectivity and reliability for Hg 2+ detection, which can function as an efficient nanosensor for the quantitative determination of Hg 2+ in Pueraria lobata . Graphical abstract
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Nano Research
·
2021
·Vol. 15
·期 4
·2928-2934
·
IF 8.897
Xiao Xudong,Lin Siying,Zhang Liping,Meng Huiyuan,Zhou Jing,Li Qi,Liu Jianan,Qiao Panzhe,Jiang Baojiang,Fu Honggang
The formation of chemical bonds between metal ions and their supports is an effective strategy to achieve good catalytic activity. However, both the synthesis of active metal species on a support and control of their coordination environment are still challenging. Here, we show the use of an organic compound to produce tubular carbon nitride (TCN) as a support for Pd nanoparticles (NPs), creating a composite material (NP-Pd-TCN). It was found that Pd ions preferentially bind with the electron-rich N atoms of TCN, leading to strong metal-support interactions that benefit charge transfer from g-C 3 N 4 to Pd. X-ray absorption spectroscopy further revealed that the metal-support interactions resulted in the formation of Pd-N bonds, which are responsible for the improvement in the charge dynamics as evidenced by the results from various techniques including photoluminescence (PL) spectroscopy, photocurrent measurements, and electrochemical impedance spectroscopy (EIS). Owing to the good dynamical properties, NP-Pd-TCN was used for photocatalytic hydrogen evolution under visible-light irradiation ( λ > 420 nm) and an excellent evolution rate of ∼ 381 µmol·h −1 (0.02 g of the photocatalyst) was attained. This work aims to promote a strategy to synthesize efficient photocatalysts for hydrogen production by controllably introducing metal nanoparticles on a support and in the meantime forming chemical bonds to achieve intimate metal-support contact.
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