Science China-Materials
·
2023
·Vol. 66
·期 8
·3129-3138
·
IF 8.1
Wang Zhe,Wang Lin,Jiang Wanyuan,Jian Xigao,Hu Fangyuan
The presence of organic electrolytes in typical liquid supercapacitors ultimately results in inadequate safety and poor flexibility, which limits the development and application of supercapacitors. Thus, we developed an easy-to-prepare ion-gel supercapacitor with strong flame-retardant properties, thermal stability, flexibility, and good electrochemical characteristics. Specifically, this ion-gel supercapacitor provides excellent performance by using the in situ cross-linking of ion-gel electrolytes on electrodes. The introduction of ether-containing flexible chain segments to the ion-gel electrolyte results in a high ionic conductivity (6.5 × 10 −3 S cm −1 ) at an ambient temperature, and the in situ cross-linking results in a tight interfacial contact between the electrolyte and electrode. The ion-gel supercapacitor retains a stable electrochemical performance while bending due to the tight interfacial contact and excellent mechanical characteristics. Furthermore, incorporating the diazonaphthone structure in the cross-linked electrolyte renders the ion-gel electrolyte excellent flame-retardant properties and thermal stability, allowing it to sustain dimensional stability at 150°C for 30 min. The supercapacitor with the optimized ion-gel electrolyte has a specific capacity of 105 F g −1 and an energy density of 41.6 W h kg −1 . The results of this study provide a practical method for preparing and optimizing ion-gel cross-linked electrolytes.
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Journal of Flow Chemistry
·
2023
·Vol. 13
·期 3
·311-323
·
IF 2.7
Song Jing,Cui Yongjin,Wang Yujun,Wang Kai,Deng Jian,Luo Guangsheng
The nitration of toluene with mixed acid is one of the most representative nitration reactions. Accurate kinetic study is essential for controlling the reaction and designing reactors. Due to the characteristics of fast rate, high exothermicity and heterogeneity in toluene nitration, the effects of mass and heat transfer may result in inaccurate determination of kinetics. In this work, the adiabatic temperature rises of the reaction system were studied to provide precise ranges of experimental conditions for accurately controlling the reaction rate and heat release rate in a liquid–liquid microflow system. The adiabatic temperature rise was successfully controlled to below 0.3 °C. The effects of mass and heat transfer on the reaction rate were completely eliminated, so that the kinetic study was carried out under the control of intrinsic kinetics only. The activation energy for toluene nitration was determined to be 28.00 kJ/mol. The activation energies for the formation of o -nitrotoluene and p -nitrotoluene were obtained for the first time, which were 25.71 and 31.91 kJ/mol, respectively. The obtained kinetic models can predict the reaction performance of toluene nitration very well.
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CELLULOSE
·
2023
·Vol. 30
·期 10
·6639-6653
·
IF 5.7
Zhou Jingyi,Duan Zijian,Lu Bin,Liu Xin,Yang Huiyu,Deng Bo
Textile structural color is an important method to replace the highly polluting coloring of traditional dyes and colors. The polydopamine (PDA) film with melanin-like characteristics can achieve multiple bright structural colors on the white cotton fabrics surface. However, PDA can cause cracking and inferior color fastness due to the influence of capillary tension during the film formation on the surface of cotton fabrics. A novel polysiloxane binder containing reactive groups, PVS, can form strong chemical bonds with PDA polymers, thereby improving the color fastness of structurally colored cotton fabrics. Moreover, the introduction of chemical bonds also reduced the proportion of surface hydrophilic groups, thus improved the hydrophobicity of the structural color film. Scanning electron microscopy was used to reveal the structure and morphology of the double-layer composite aggregates formed by the DA self-polymerization. Fourier transform infrared spectroscopy and X-ray diffraction spectroscopy were used to investigate the surface composition of structural color cotton fabrics. The color properties of PDA structured color films were revealed by UV-Vis diffuse reflectance and reflectance spectrometer.
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JOURNAL OF RADIOANALYTICAL AND NUCLEAR CHEMISTRY
·
2023
·Vol. 332
·期 7
·2589-2600
·
IF 1.6
Wang Binyan,Lu Shufan,Dai Chenjing,Ma Jianguo,Luo Jianqiang,Meng Jia,Tong Xiaolan,Liu Shujuan
In present paper, a porous carbon composite electrode, doped with nickel hexacyanoferrate, was prepared for electrochemical removal of cesium ions from aqueous solutions. Based upon the applied voltage of −3 V, a 100% adsorption was achieved in 3 h for the initial Cs + concentration of 10 ppm in solution. The maximum capacity was 155.2 mg g −1 under optimized electrochemical conditions. The electrode was regenerated by applying a reverse voltage of 3 V. The removal efficiency remained 95% even after five consecutive adsorption–desorption cycles. The results suggested that the developed electrochemical method has strong potential for extracting cesium from aqueous solutions.
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JOURNAL OF MATERIALS SCIENCE
·
2023
·Vol. 58
·期 17
·7333-7346
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IF 4.5
Yasin Umsalama Abuelgasim Abubakr,Ahmed Md. Maruf,Zhang Juan,Jia Zhixin,Guo Tianyu,Zhao Ruihua,Shi Jiahui,Du Jianping
Design and development of high-effective photocatalysts to remove multiple organic pollutants are a great challenge. Herein, the band structure of CuO is regulated by constructing the heterostructures between AgBr and CuO, which is realized by controlling hybrid morphologies. The as-prepared AgBr/CuO material consists of CuO nanoflakes and AgBr nanoparticles. Notably, AgBr nanoparticles are adhering on the surface of CuO nanosheets, which favors the formation of heterojunction with point to plane contact and fasten electron transfer. The photocatalytic results show that the AgBr/CuO photocatalyst, prepared by using the 0.1 mol AgNO 3 and KBr as raw materials, presents superior photodegradation activity toward degradation of multi-pollutants with dye concentration of 15 mg L −1 and pH = 7. The methyl violet removal rate reaches 98% within 60 min in the present of 0.1 g catalyst under visible light, and rhodamine B and methyl blue are degraded to 98 and 78% within 90 min. The radical trapping tests prove that photogenerated superoxide radicals (∙O 2 − ) and holes (h + ) act as the main active species in photodegradation of MV. The result indicates that point to plane-contacted heterostructure of AgBr/CuO material plays a key role and it has potential application in the environment remediation. Graphical abstract
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RESEARCH ON CHEMICAL INTERMEDIATES
·
2023
·Vol. 49
·期 10
·4291-4316
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IF 3.3
Liu Huadong,Du Kezhen,Sun Hao,Li Hewei
Herein, we have successfully prepared multifunctional nitrogen–boron co-doped carbon quantum dots (N,B-CQDs) with excellent performance by a one-step hydrothermal method and further applied them to the design of highly efficient fluorescent probes and visible light responsive photocatalysts. N,B-CQDs have excellent selectivity and high sensitivity to Fe 3+ and Hg 2+ , with LODs of 1.8 μM and 0.34 μM, respectively. The experimental results show that the fluorescence quenching mechanism of Fe 3+ and Hg 2+ detected by N,S-CQDs is the result of dynamic quenching and static quenching. Besides, BiOCl modified by N,S-CQDs(BiOCl/N,B-CQDs) was prepared by one-step hydrothermal method, and the morphology of catalysts and the adhesion of N,B-CQDs were observed by several scientific methods. The photocatalytic results showed that the degradation rate of RhB by BiOCl/N,B-CQDs was up to 99.4% under optimal conditions, which was higher than that of BiOCl (80%). Free radical quenching experiments proved that ·OH and ·O 2 − were the main active substances in the reaction process. Finally, the aim of this study is to offer a novel approach to developing multi-function CQDs as a sensor for metal ions and their modified composites as visible light-induced photocatalysts for the effective detection and degradation of contaminants.
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APPLIED COMPOSITE MATERIALS
·
2023
·Vol. 30
·期 6
·1929-1947
·
IF 2.3
Chang Kai,Qin Yan,Zou Zhenyue,Huang Zhixiong
Oxidation at high temperatures impairs the properties of carbon fiber, limiting its application in thermal protection materials. In this work, alumina fiber hybrid carbon fiber reinforcements (Al 2 O 3 f-CF) were designed to improve the high-temperature oxidation resistance of carbon fiber, and Al 2 O 3 f-CF hybrid fiber reinforced ceramicizable phenolic resin matrix composites (ACFRP) were prepared to investigate thermal stability, mechanical properties, ablation resistance, and interface evolution at high temperatures. The results showed that after being treated at 1600 ℃ for 10 min, the flexural strength reached 43.74 MPa, which increased by 98.1%. The linear ablation rate and mass ablation rate of ACFRP were 0.06 mm/s and 0.056 g/s, respectively. The interface analysis showed that the coating of alumina fiber protected the carbon fiber well at high temperatures. Fiber hybrid provides a simple and effective method to improve the high-temperature oxidation resistance of carbon fiber.
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Revista Brasileira de Farmacognosia-Brazilian Journal of Pharmacognosy
·
2023
·
IF 1.6
Su Jiangtao,Zhang Yuxuan,Ye Lu,Chen Xue,Hu Yuchen
Psoriasis is a chronic papulosquamous skin disease whose current treatments have severe side effects, which limits their long-term application. Developing effective treatments for psoriasis is an important and challenging task. Coptis chinensis Franch., Ranunculaceae, and Phellodendron amurense Rupr., Rutaceae, are widely used in traditional Chinese medicine to treat psoriasis. Therefore, this article aims to construct a thermo-sensitive local administration system based on multiple alkaloids from C. chinensis and P. amurense . The methods of extracting the effective components of C. chinensis and P. amurense were screened by single-factor experiment and orthogonal experiment. Furthermore, the optimal gel formulation was determined, and the obtained CPG-S hydrogel ( C. chinensis and P. amurense gel with S -nitrosated acetylpenicillamine as a penetration promoter) exhibited thermo-sensitivity and excellent transdermal ability. Then, the therapeutic effect of the CPG-S hydrogel was examined in a psoriasis mouse model. The effectiveness of the CPG-S hydrogel in reducing the symptoms of redness, swelling, and squamous epidermis, as well as downregulating the related inflammatory factors IL-17A and IL-23, was confirmed. The CPG-S hydrogel was found to be more effective than the commercially available psoriasis treatment drug mometasone furoate cream, indicating its potential application as an effective psoriasis treatment drug. Graphical abstract
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JOURNAL OF ELECTRONIC MATERIALS
·
2023
·Vol. 52
·期 11
·7193-7207
·
IF 2.1
Yuan ChongXiao,Zhang Chao,Yang Cheng,Wu Fuling,Xiao Shibing,Sun Huajun
Flexible wearable sensing devices are in great demand for self-powered systems. In this study, we fabricated fiber films of poly(vinylidene fluoride) (PVDF) matrix embedded with modified lead zirconate titanate nanoparticles (PZT NPs) using the electrospinning process. Each fiber film was cut into small pieces of 2 × 2 cm 2 , and pairs of pieces were pressed with a hot-pressing method. Modified PZT NPs with a high piezoelectric coefficient were embedded in PVDF fibers as a piezoelectric-reinforcing phase, which promoted the formation of the polar β phase in PVDF. The embedded PZT NPs affected the distribution of the polarized electric field and formed a local electric field between two PZT NPs, which promoted the polarization of PVDF, thereby enhancing the piezoelectric properties of PVDF/PZT NPs fiber films. The piezoelectric coefficient ( d 33 ) of the PVDF/PZT NPs fiber films embedding 4 wt.% PZT NPs showed the most significant enhancement, from 12 pC/N for neat PVDF to 21 pC/N, which is an approximately 75% improvement. The results of this work demonstrate the great potential application of piezoelectric composite fiber films in flexible wearable sensing devices.
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MOLECULAR IMAGING AND BIOLOGY
·
2023
·Vol. 25
·期 5
·875-886
·
IF 3.1
Hui Xin,Wang Yanxing,Li Wenjing,Yuan Ying,Tao Xiaofeng,Lv Ruichan
In this research, we designed a novel NIR II luminescence imaging probe with targeting effect to accurately track oral squamous cell carcinoma (OSCC) cells. Massive gene expression data were processed by weighted gene co-expression network analysis to establish a network of relationships between genes. After clustering, correlation of clinical information, and gene functional enrichment analysis, MMP1 was predicted to be a biomarker/therapeutic target for OSCC cells. To obtain rare-earth probes with better luminescence in the NIR II region, we adjusted the doping ratio of the rare-earth element (Nd, Gd, Er, and Yb) fraction of the Nd-Mn molecular cluster to optimize its luminescence properties. The results of in vitro targeting experiments showed that Nd-Mn-MMP1Ab can target Cal-27 cells, demonstrating at the cellular level that the MMP1 gene is a biomarker for oral cancer, which also proves that the cancer targets predicted by the bioinformatics approach are correct.
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PubMed
高影响因子
MOLECULAR BIOTECHNOLOGY
·
2023
·
IF 2.6
Chang Ruijing,Su Yuan,Kong Hongfang,Wang Fang,Xing Ying,Jiang Lei,Xin Hong
Disturbance of extravillous trophoblast infiltration is associated with preeclampsia (PE), a severe condition of pregnancy characterized by hypertension and proteinuria. Senescence-associated epithelial membrane protein 1 (SEMP1), an integral membrane protein, is a vital component of tight junction strands in epithelial or endothelial cells, with no clear function reported in PE. Gene Expression Omnibus (GEO) datasets showed that SEMP1 expression was downregulated in the placental tissues of PE patients, which was confirmed by assessing SEMP1 levels in placental samples collected in our hospital. Furthermore, less SEMP1 was detected in cytokeratin 7 positive trophoblast cells in the spiral arteries of rat placentas post L-arginine methyl ester hydrochloride (L-NAME) treatment. Trophoblast cells acquired robust ability of proliferation, migration, and invasion when SEMP1 was overexpressed. Such capability was weakened in SEMP1-silenced cells. Trophoblast cells overexpressing SEMP1 secreted more vascular endothelial growth factor A (VEGFA), which facilitated the tube formation of human umbilical vein endothelial cells. Blockade of PI3K/AKT signaling transduction with LY294002 dampened the effects of SEMP1 on trophoblast cells. Collectively, we firstly indicated that SEMP1 inhibition is a potential driver for PE, which may be associated with the deactivation of the PI3K/AKT pathway. Graphical Abstract SEMP1 was involved in PE progression by regulating cell growth, migration, invasion, and tube formation via PI3K/AKT signaling pathway in trophoblast cells and endothelial cells.
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PubMed
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JOURNAL OF WUHAN UNIVERSITY OF TECHNOLOGY-MATERIALS SCIENCE EDITION
·
2023
·Vol. 38
·期 2
·286-291
·
IF 1.6
Hu Mei,Xin Jin,Liu Zhenyu,Zeng Hui,Wang Yanze
We studied a method to prepare a novel titanium dioxide (TiO 2 ) composite photocatalyst, starting from improving the separation efficiency of photogenerated electrons and holes. Regular TiO 2 microspheres were prepared by sol-gel method and loaded onto Ti 3 C 2 T x (Mxene). The high electrical conductivity of Mxene was utilized to transfer photogenerated electrons quickly and effectively prevent their recombination. By adjusting the addition amount of Mxene, the hydrogen production efficiency of the sample was greatly improved, and the maximum efficiency reached 135.2 µmol·g −1 ·h −1 , which was twice that of pure TiO 2 . The nanocomposites were characterized by XRD, PL, TEM and SEM analysis and electrochemical methods, and the test proved that the improvement of hydrogen production efficiency was caused by the improvement of the separation efficiency of photogenerated electrons and holes. This work demonstrates the application of Mxene as a catalyst to improve efficiency and broadens the application prospects of Mxene.
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