FIBERS AND POLYMERS
·
2023
·Vol. 24
·期 2
·459-468
·
IF 2.5
Lin Junxiong,Wang Peng,Zhu Lei
Silver nanoparticles (Ag NPs) were synthesized on cotton fabrics through in-situ radical reduction of Ag + with macromolecular alcohol radicals generated from a polymer blend under UV light. This light-induced approach permitted direct photopatterning of Ag particles on the surface of cotton fabric. The cotton fabrics were colored brown by the Ag NPs owing to their surface plasmon resonance characteristics, and the lighter brown or darker brown color could be adjusted by controlling the light exposure time or Ag + concentration in the synthesizing process. The Ag NPs loaded fabrics were investigated using SEM, EDX and XPS techniques. The results showed that Ag + ions were successfully reduced to metallic Ag NPs, and these particles could be clearly observed by the morphological observation study. The Ag NPs loaded cotton fabric exhibited satisfactory washing and rubbing colorfastness. In addition, the Ag NPs on the surface endowed the cotton fabric with good antibacterial activity and conductive performance.
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ACTA PHARMACOLOGICA SINICA
·
2022
·Vol. 44
·期 6
·1262-1276
·
IF 7.169
Song Qi-qi,Lin Li-ping,Chen Ya-li,Qian Jia-cheng,Wei Ke,Su Jian-wei,Ding Jian-hua,Lu Ming,Liu Yang,Tan Ren-xiang,Hu Gang
Malignant glioma is the most fatal, invasive brain cancer with limited treatment options. Our previous studies show that 2-(indol-3-ylmethyl)-3,3′-diindolylmethane (LTr1), a major metabolite of indole-3-carbinol (I3C) derived from cruciferous vegetables, produces anti-tumour effect against various tumour cell lines. In this study we characterized LTr1 as a novel anti-glioma agent. Based on screening 134 natural compounds and comparing the candidates’ efficacy and toxicity, LTr1 was selected as the lead compound. We showed that LTr1 potently inhibited the viability of human glioma cell lines (SHG-44, U87, and U251) with IC 50 values of 1.97, 1.84, and 2.03 μM, respectively. Furthermore, administration of LTr1 (100,300 mg· kg −1 ·d −1 , i.g. for 18 days) dose-dependently suppressed the tumour growth in a U87 xenograft nude mouse model. We demonstrated that LTr1 directly bound with TrkA to inhibit its kinase activity and the downstream PI3K/AKT pathway thus inducing significant S-phase cell cycle arrest and apoptosis in SHG-44 and U87 cells by activating the mitochondrial pathway and inducing the production of reactive oxygen species (ROS). Importantly, LTr1 could cross the blood-brain barrier to achieve the therapeutic concentration in the brain. Taken together, LTr1 is a safe and promising therapeutic agent against glioma through inhibiting TrkA/PI3K/AKT pathway.
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PubMed
高影响因子
TOPICS IN CATALYSIS
·
2022
·Vol. 66
·期 1
·262-274
·
IF 2.781
Pham Cham Q.,Nguyen Van-Phuoc,Van Thuan Tran,Phuong Pham T.T.,Pham Phuong T.H.,Trinh Thanh H.,Nguyen Tung M.
Syngas, a mixture of carbon monoxide and hydrogen, is widely used in electricity, synthetic chemicals, and fuels productions. Syngas can be obtained from a chemical reaction between methane and carbon dioxide that are commonly found in biogas. In this study, a simulated mixture of biogas containing CH 4 :CO 2 = 1:1 (mol/mol) was used as the feedstock. Different nickel-based catalysts supported on TiO 2 , MgO, KIT-6, and Al 2 O 3 have been prepared through the dry impregnation method with a fixed Ni dosage of 10 wt%. All samples were characterized by modern techniques including XRD, BET, H 2 -TPR, CO 2 -TPD, TPO, and TEM. It was found that the metal-support interaction played a critical role in metal dispersibility and reducibility of catalyst precursors. During the methane dry reforming, catalyst basicity is a crucial factor facilitating the adsorption and activation of carbon dioxide. The highest activity was achieved over 10Ni/Al 2 O 3 with the methane conversion of 73.2% and carbon dioxide conversion of 86.9%. Furthermore, the effects of support properties on the catalyst stability were studied. Nature of support especially basicity plays an important role on the deposition of carbon over the active sites. The Ni/Al 2 O 3 with good nickel dispersibility, affordable metal-support interaction, reasonable basicity was reported the most stable without any significant deactivation after 6 h reaction. Finally, the catalyst design strategy for the DRM was proposed.
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JOURNAL OF ELECTRONIC MATERIALS
·
2022
·Vol. 52
·期 2
·819-828
·
IF 2.047
Zhao Qiang,Zhou Jinglin,Zheng Xiang,Wang Ying,Ye Beirong
Electrodes with excellent flexibility, wide voltage window and high capacity are the key to the performance of asymmetric supercapacitors (ASCs). Herein, a hybrid electrode based on modified nitrogen/alkali co-doped carbon cloth with NiCoSe 2 (NCSe/N-Na-ACC) was successfully synthesized and directly used as a positive electrode for ASCs. The surface-modified carbon cloth with N and Na ions effectively moderated the electronic conductivity and activity of the oxygen evolution reaction (OER), resulting in an enlarged overall voltage window, while NCSe provided high specific capacity. Therefore, the voltage of the NCSe/N-Na-ACC electrode increased to 1 V in aqueous electrolyte. As a result, the solid-state ASC assembled by the modified electrode delivered gratifying energy density of 139.5 W h kg –1 . Meanwhile, the excellent capacitance retention of 97.1% after 10,000 charge and discharge cycles implies that the ASC assembled with the NCSe/N-Na-ACC electrode has excellent cycling stability.
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CATALYSIS LETTERS
·
2022
·Vol. 153
·期 11
·3383-3391
·
IF 2.936
Zhang Luping,Tu Xuewei,Han Weihang,Chen Liangchen,Chen Yutong,Zheng Hui
As the main resource of greenhouse gas, CO 2 needs to be fixed into different chemicals to relieve the environmental problem. Fe-based catalyst and g-C 3 N 4 have received extensive attention due to their easy preparation, low cost, and environmental friendliness. Herein, a heterogeneous catalyst system consisting of rich-electron g-C 3 N 4 and strong electron-withdrawing groups Fe-complex [Fe(bpy)(CO) 2 (Cl) 2 ] was developed, which could promote electron transfer and enhance the electronic interaction for fixing CO 2 . o -phenylenediamine substrates with different electron-donating/withdrawing groups were employed to fix CO 2 into high-valued heterocycle benzimidazoles. The optimum reaction conditions were examined by orthogonal experiments. A series of benzimidazole derivatives were synthesized with yield up to 98%, which indicated the catalyst had the ability of fixing CO 2 . This catalyst provides a new pathway for fixing CO 2 into valuable benzimidazole derivatives. Graphical Abstract
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CELLULOSE
·
2022
·Vol. 30
·期 2
·801-813
·
IF 6.123
Wei Chunjie,Liu Gang,Xie Yujiao,Sun Zhongyuan,Liu Chang,Song Feng,Cui Hongyou
Molten salt hydrate (MSH) is a good solvent for cellulose dissolution and an effective catalyst for cellulose conversion. In this work, a series of MSH was evaluated in terms of cellulose dissolvability, regeneration performance, and catalytic activity in cellulose conversion into 5-hydroxymethylfurfural (HMF). ZnBr 2 ·3H 2 O–LiCl·3H 2 O showed good performance on cellulose dissolution and conversion. The effects of ZnBr 2 ·3H 2 O concentration, reaction temperature, and time on cellulose conversion into HMF in ZnBr 2 ·3H 2 O–LiCl·3H 2 O were optimized, and 48.7% HMF yield was reached at 60 wt.% ZnBr 2 ·3H 2 O. The species of ZnBr 2 ·3H 2 O–LiCl·3H 2 O were analyzed, and the function of species concentration was correlated with the product yield from the conversion of fructose. It was found that Br − and H + were the active species for fructose dehydration into HMF. ZnBr 3 − and H + catalyzed the conversion of fructose into furfural, which competed with the production of HMF. The reaction mechanism was proposed to understand the cooperate of species in MSH for cellulose conversion.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 8
·3825-3836
·
IF 4.5
Geng Cong,Lv Jiayu,Ming Hao,Liu Shiyue,Gao Yingjun,Meng Jing,Gao Weichun,Shen Xinjun,Zhao Zhongyuan,Xi Jingjun,Chen Shengwei,Guan Yinyan,Liang Jiyan
Capacitive Deionization (CDI) is a low energy, environmentally friendly desalination technology. In this study, PTFE activated carbon electrodes were prepared based on emulsion spraying technology and applied to CDI. In this article, resistivity, contact angle, specific surface area was tested. Combined with scanning electron microscope(SEM) and cyclic voltammetry(CV), the influence of KH550 dosages (2 g, 4 g, 6 g, 8 g) and layers of spraying (1–6 layers) on electrode performance was investigated. Coupling reagent KH550 played a role to enhance the adhesion of PTFE, and bridge activated carbon to form path for electron together with PTFE. When 4 g KH550 is added, a continuous conductive path was achieved, so the electrode exhibit good conductivity, with a resistivity of 7.65 Ω/cm. As layer increasing, more active carbon, the adsorbent, were joined together by binder, PTFE and KH550. Therefore, the specific surface area and capacitance increased. When 4 layers were sprayed, the electrode obtained a better specific capacitance, 0.564 F/cm 2 , but the mass transfer resistance became higher. Electrode, prepared by 4 g KH550 and 3 layers, was used for desalination. For low-concentration brine, salt removal rate and charge efficiency were 8.849 mg/g and 46.75%, respectively. This research provides a simple route for the preparation of activated carbon electrodes for the preparation of CDI, which was easy to expand production. The prepared electrode has great application potential in brackish water desalination.
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MICROCHIMICA ACTA
·
2022
·Vol. 190
·期 1
·1-10
·
IF 6.408
Zhu Jing,Xu Wenxing,Yang Ye,Kong Rongmei,Wang Junmei
A nanozyme sensor array based on the ssDNA-distensible C3N4 nanosheet sensor elements for discriminating multiple mycotoxins commonly existing in contaminated cereals has been explored. The sensor array exploited (a) three DNA nonspecific sequences (A40, T40, C40) absorbed on the C3N4 nanosheets as sensor elements catalyzing the oxidation of TMB; (b) the presence of five mycotoxins affected the catalytic activity of three nanozymes with various degrees. The parameter (A 0 -A) was employed as the signal output to obtain the response patterns for different mycotoxins with the same concentration where A 0 and A were the absorption peak values at 650 nm of oxTMB in the absence and presence of target mycotoxins, respectively. After the raw data was subjected to principal component analysis, 3D canonical score plots were obtained. The sensor array was capable of separating five mycotoxins from each other with 100% accuracy even if the concentration of the mycotoxins was as low as 1 nM. Moreover, the array performed well in discriminating the mycotoxin mixtures with different ratios. Importantly, the practicality of this sensor array was demonstrated by discriminating the five mycotoxins spiking in corn-free samples in 3D canonical score plots, validating that the sensor array can act as a flexible detection tool for food safety. Graphical abstract A nanozyme sensor array was developed based on the ssDNA-distensible C3N4 NSs sensor elements for discriminating muitiple mycotoxins.
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Science China-Chemistry
·
2023
·Vol. 66
·期 3
·878-886
·
IF 9.6
Mao Junqiang,Cao Huimei,Liu Jie,Zhou Xin,Fan Qingrui,Wang Jianjun
Nature provides diverse models for manufacturing complex and hierarchical materials by controlling molecular assembly at scales ranging from sub-nano to macroscale. However, developing artificial strategies for manufacturing hierarchical materials with comparable machining capabilities to nature is extremely challenging. Here, a templated freezing assembly strategy is reported, enabling simultaneously regulating molecular assembly spatiotemporally to obtain hierarchical materials with structure control from sub-nano to macroscale. In this way, unique centimeter-scale freestanding nanofilms are assembled from diverse molecules, e.g. , proteins and conjugated polymers. A generated silk fibroin (SF) nanofilm presents a tunable β -sheet fraction from 5% to 47%, fiber width from 30 to 3,000 nm, and micro-textures with desired shapes. Such a strategy will lay the foundation for customizing hierarchical functional materials from single or multi-component molecules, e.g. , desired bio-scaffolds with controlled cell adhesion.
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POLYMER BULLETIN
·
2023
·Vol. 80
·期 12
·13319-13341
·
IF 3.2
Zhang Qunli,Zhai Weili,Cui Linlin,Liu Yupeng,Xie Wenjing,Yu Qimeng,Luo Hao
Polylactic acid (PLA)/starch acetate (SA) base film was prepared by scraping film method with PLA as the base film material, modified SA as the filling phase and polyethylene glycol (PEG) as plasticizer. Chitosan (CS)/tea polyphenol (TP) antibacterial agent was coated on the surface of PLA/SA base film by coating method. The morphology and structure of the composite film were characterized by FTIR, XRD, SEM and thermogravimetric analysis, and the mechanical, optical and antibacterial properties were tested and analyzed. The results showed that CS/TP compound antibacterial agent was well combined with PLA/SA base film. Compared with the PLA/SA base film, when the content of TP (based on the mass of PLA/SA base film, the same below) was 0.4%, the tensile strength of the composite film increased by 29.33%, had good mechanical strength (24.96 ± 0.65 MPa), and the elongation at break increased by 29.34%; There was no obvious change in transparency, the light transmittance decreased by 0.86%; At the same time, the antibacterial composite film had good antibacterial effect on Escherichia coli , Staphylococcus aureus and Bacillus subtilis . PLA/SA/CS/TP antibacterial composite film could be used in food packaging, especially those designed to protect food from light and microbial decay.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2023
·Vol. 34
·期 3
·1-15
·
IF 2.8
Jiang Xiangqian,Chen Weiping,Li Ling,Gao Peng,Ban Chuncheng,Hao Jiandong,Shi Ningqiang
Boron Nitride Aerogels/PEDOT: PSS composite film with good thermoelectric properties were prepared by a simple preparation process. Boron nitride aerogels with a width of less than 1 μm and thickness of approximately 15 nm were prepared by a combination of freeze-drying and high-temperature tubular furnace heating. Then, boron nitride aerogels material was impregnated in a certain amount of 3, 4-ethylenedioxythiophene monomer polymer: polystyrene sulfonate (PEDOT: PSS) solution by ultrasonic vibration and magnetic stirring to produce a composite film. The output voltage of the flexible Boron Nitride Aerogels/PEDOT: PSS/Au piezoelectric sensor increases with an increase in the bending angle. When the bending angle is greater than 90°, the output voltage reaches 4.03 V. For the sake of broaden the application prospect of nanocomposite films, flexible wearable thermoelectric devices were prepared. Using the human body as a heat source, the output voltage of flexible thin-film thermoelectric devices can reach 233.6 mV. According to the formula calculation, the Seebeck coefficient is 18.54 mV/K and the thermoelectric power factor is 28.86 μW/mK 2 . With improvements in the energy collection capacity of wearable energy devices, we believe that more work will be done in the future to realize the coordinated development of functionality, comfort and health on the basis of improving energy conversion efficiency.
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Microbial Cell Factories
·
2022
·Vol. 21
·期 1
·1-13
·
IF 6.352
Zhong Zhi-Hao,Zhang Yu-Qing
Background The immobilized technology for microbial or cells has the advantages of high microbial activity, high microbial density per unit space, good tolerance, strong shock, load resistance, high processing efficiency, and high reuse rate. It is now widely used in environmental remediation, water quality treatment, biodegradation, food industry, chemical analysis, energy development, medicine and pharmaceuticals, and other fields.Results A novel Escherichia coli cell-immobilizing polyvinyl alcohol hydrogel membrane (ECI-PVAHM) was prepared by unidirectional nanopore dehydration (UND) from a 10% polyvinyl alcohol (PVA) aqueous solution containing enhanced green fluorescent protein-labeled E. coli. This bacteria-loaded film has high water stability, flexibility, transparency, and mechanical robustness. Its tensile strength, elongation rate, and swelling rate are in the ranges 0.66–0.90 MPa, 300–390%, and 330–800%, respectively. The effective bacterial load of ECI-PVAHM is 2.375 × 109–1010 CFU/g (dry weight), which does not affect the original crystal structure of the PVAHM. This biofilm has a porous network structure with pore sizes between 0.2 and 1.0 μm, and these cells are embedded in the PVAHM network. When the immobilized cells were continuously cultured for 20 days, and the medium was renewed twice daily, their relative proliferation efficiency after 40 cycles could still be maintained at ~ 91%.Conclusion The above results show that the cell division, proliferation ability, and metabolic activity of immobilized E. coli were not affected by the physical barrier of the porous network structure of the hydrogel. This UND-based ECI-PVAHM has potential applications in molecular biology, biopharmaceutical expression and production, bioreactors, and fuel cells.
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