FIBERS AND POLYMERS
·
2023
·Vol. 24
·期 10
·3373-3384
·
IF 2.5
Hu Xinyi,Kong Que,Li Rong,Zhou Change,Li Zhiguang
Making a multifunctional hydrogel-based wound dressing is a long-term research goal. Therefore, it is of great significance to develop an ideal wound dressing with desirable biocompatibility, adhesive property, antibacterial property and simple production. Herein, molecular network crosslinking hydrogels were achieved through the nucleophilic addition of polyphenol-sulfur radical using tannic acid and thioctic acid as matrix. The multifunctional tannic–thioctic acid (TATA) hydrogels with excellent rheological properties were prepared by further modification of antibacterial and hydrophobic properties. The successful cross-linking of the molecules was confirmed by infrared spectroscopy, Raman spectroscopy and energy dispersive X-ray spectroscopy (EDX). Complex hydrogels had certain hydrophobic properties, which can slowly absorb wound tissue fluid and keep the wetness of the wound. In addition, the hydrogel had good rheological, antibacterial and antioxidant properties, and also improved blood clotting effect and biocompatibility. These results indicated that TATA hydrogel had the potential prospect to be used as a novel wound dressing for a wide range of medical applications. Graphical abstract
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DOI
高影响因子
CATALYSIS LETTERS
·
2022
·Vol. 153
·期 4
·956-964
·
IF 2.936
Han Song,Chen Wen-Ting,Gao Zi-Teng,Guan Hua,Li Zhang-Min,Tao Duan-Jian
A mechanochemical treatment and subsequent high temperature annealing strategy was developed for the synthesis of nitrogen-doped carbon supported cobalt catalysts. The as-prepared Co/NC 800 catalyst was demonstrated for efficient and selective hydrogenation of furfural into furfuryl-based alcohols and amines with good to excellent yields under optimum conditions. Graphical
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高影响因子
Biomass Conversion and Biorefinery
·
2022
·Vol. 14
·期 4
·5295-5304
·
IF 4.05
Tong Dongshen,Chen Xingtao,Dong Yuxiao,Fang Zhi,Zhang Hao,Zhou Chunhui,Yu Weihua
Kaolinite is a layered silicate material with a Janus character and has been directly used as the solid catalyst for the hydrolysis of cellulose in our previous work. Reducing sugar (RS) is one of the most important intermediates for the utilization of cellulose. In the present study, metal ions dispersed on kaolinite was easily prepared and further evaluated for the hydrolysis of cellulose to RS in water. The metal ions dispersed kaolinite was characterized by XRD, BET, SEM(EDS), and XPS. The catalytic results showed that copper was the best co-catalyst among the tested metal ions and the kaolinite treated with 4(wt)% copper nitrate by calcination at 623 K showed the highest total reducing sugar (TRS) yield of 51% under 478 K with the mass ratio of catalyst to cellulose of 0.2 and weight ratio of water to cellulose of 7 for 3 h. Moreover, the catalyst could be easily regenerated by calcination and the yield of TRS on the regenerated catalyst decreased from 51 to 43.2% after four times reuse. The characterization results revealed that copper was highly dispersed on the outer SiO 4 tetrahedral layer. The surface cuprous species were the active sites and could make the C-O bond cleavage easily by attacking the positively charged carbon atoms of the β-(1,4)-glycosidic linkage in the cellulose. The leaching of the cuprous species was responsible for the deactivation of the catalyst. The copper dispersed kaolinite is the efficient catalyst for the hydrolysis cellulose to reducing sugars and worth further development. Graphical abstract
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高影响因子
Carbon Letters
·
2023
·Vol. 34
·期 1
·123-131
·
IF 4.5
Gao Guihai,Chen Jianxu
This study systematically investigated the efficacy of incorporating graphene/cerium hydroxide (GH) composite material into epoxy-modified polyurethane resin coatings for enhancing the corrosion resistance of Q690qE steel within polluted marine atmospheric conditions. The research encompassed a range of electrochemical assessments and analyses. Notably, the E/GH-0.3% coating displayed a substantially positive open-circuit potential (OCP) and prominently reduced corrosion current density, leading to annual corrosion rates of 2.72 mm/a following 25 days of immersion. Electrochemical impedance spectroscopy (EIS) elucidated the superiority of the E/GH-0.3% coating, characterized by the highest impedance modulus |Z| at 0.1 Hz, indicative of robust corrosion protection. Remarkably, the self-healing performance of E/GH-0.3% and E/GH-0.5% coatings was evidenced by the formation of a composite passivation layer at scratch sites, particularly pronounced after 40 days of immersion. These findings underscore the promising potential of the GH composite as an effective corrosion inhibitor, holding significant promise for the advancement of protective coatings in harsh coastal industrial environments.
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高影响因子
CATALYSIS LETTERS
·
2024
·Vol. 154
·期 7
·3494-3502
·
IF 2.3
Zhou Shuolin,Wen Sha,Xu Qiong,Liu Xianxiang,Yin Dulin
5-Hydroxymethylfurfural (HMF) serves as a versatile platform compound bridging the realms of biomass resources and the fine chemicals industry, with its selective oxidation holding significant value. In this study, nitrogen-doped porous carbon (NDPC) materials were synthesized by using urea as the nitrogen source and sucrose as the carbon source via a hard-template approach. These materials were subsequently employed in the selective oxidation of HMF to produce 2,5-diformylfuran (DFF) under specific oxygen pressure conditions. The morphology and structure of NDPC were elucidated through SEM, XPS and XRD analyses. The impact of varying the molar ratio of N/C and nitrogen sources on the catalyst was examined, as well as the effects of different reaction conditions on HMF conversion and DFF selectivity were investigated. The results demonstrated an impressive 81.0% HMF conversion and a remarkable 97.9% DFF selectivity under the suitable conditions. Furthermore, the catalyst exhibited consistent catalytic performance throughout the recycling experiments. Graphical
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高影响因子
COLLOID AND POLYMER SCIENCE
·
2024
·Vol. 302
·期 5
·819-828
·
IF 2.2
Ji Xinyuan,Yang Zhe,Fang Jiahui,Hu Sheng
In this study, a novel molecularly imprinted polymer (MIP) was synthesized with attapulgite (ATP) and acrylamide (AM) and ethyl methacrylate (MMA) for controlled release carrier of 5-fluorouracil (5-FU). The MIPs (PAM-PMMA) were characterized by XRD, FESEM, HRTEM, and FTIR. The drug loading and in vitro controlled release ability of MIP on 5-FU was investigated by adsorption property analysis and in vitro release analysis. MIPs (PAM-PMMA) reached a maximum drug loading of 12 mg/g and a maximum release of 80% at an ATP dosage of 0.2 g (0.4%), an initial concentration of 5-FU of 100 mg/L, and an adsorption time of 240 min. Cytotoxicity analysis showed that the maximum inhibition of cells could reach 25% at 72 h of cell culture time under the above conditions. The results showed that MIPs synthesized with ATP as the substrate and AM and MMA as the functional monomers were successfully synthesized and could be used as a drug delivery system for 5-FU. Graphical
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高影响因子
JOURNAL OF MATERIALS ENGINEERING AND PERFORMANCE
·
2023
·Vol. 33
·期 11
·5667-5681
·
IF 2.3
Dong Shengkang,Guo Zhiwei,Zang Hongshuang,Yuan Chengqing
Polytetrafluoroethylene (PTFE) has great potential for applications in water-lubricated bearings; however, in heavy load conditions at low speeds, PTFE suffers from severe friction and abrasion because of its poor wear resistance. In this study, silicon carbide (SiC) content and particle size are investigated in relation to PTFE water-lubricated composites' tribological properties. The results show that the wear resistance of PTFE composites can be significantly improved when the filling amount of SiC particles was between 3 and 5 wt.%, and the composites containing 5 wt.% SiC reduced wear loss by 99.44%. The composites' friction and wear properties decreased as SiC particle size increased, and wear mechanism for the composites shifted from adhesive to abrasive. Wear loss on PTFE composites filled with 40 nm SiC particles was reduced by 97.03%, showing the best wear resistance. This study provides an experimental basis for the development of high-performance PTFE water-lubricated bearings.
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高影响因子
JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 2
·1-13
·
IF 2.8
Wu Canfeng,Chen Yanrong,Yao Yingbang
Graphitic carbon nitride (g-C 3 N 4 ) has been widely studied and applied in the field of catalysis, but its photocatalytic performance still needs to be improved. In this work, g-C 3 N 4 was protonated with hydrochloric acid and nitric acid, and the products were denoted as HCN and NCN, respectively. The photocatalytic performances of g-C 3 N 4 , HCN, and NCN were compared by the degradation of Rhodamine B solution (RhB) under visible light. The structure, morphology, optical, and electrochemical properties of the samples were systematically characterized. It was found that both HCN and NCN were composed of uniform nanosheets, and HCN had a better separation. The UV–Vis and PL spectra showed that the band gap of the material was widened, and the photogenerated electron-hole pairs can be effectively separated. From the photocatalytic degradation test, HCN and NCN showed stronger photocatalytic activity than g-C 3 N 4 , and the degradation efficiency was HCN > NCN > g-C 3 N 4 , the degradation of RhB were 98%, 95%, and 78% respectively at 75 min. The experiment of the free radical scrubber showed that superoxide free radical was the main active substance of photocatalytic degradation. Our results have potential application value for the design of two-dimensional photocatalytic materials.
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高影响因子
Nanoscale Research Letters
·
2019
·Vol. 14
·期 1
·1-9
·
IF 3.159
Lin Shizhe,Cheng Yongliang,Mo Xiwei,Chen Shuwen,Xu Zisheng,Zhou Bingpu,Zhou He,Hu Bin,Zhou Jun
Polytetrafluoroethylene (PTFE) is a fascinating electret material widely used for energy harvesting and sensing, and an enhancement in the performance could be expected by reducing its size into nanoscale because of a higher surface charge density attained. Hence, the present study demonstrates the use of nanofibrous PTFE for high-performance self-powered wearable sensors. The nanofibrous PTFE is fabricated by electrospinning with a suspension of PTFE particles in dilute polyethylene oxide (PEO) aqueous solution, followed by a thermal treatment at 350 °C to remove the PEO component from the electrospun PTFE-PEO nanofibers. The obtained PTFE nanofibrous membrane exhibits good air permeability with pressure drop comparable to face masks, excellent mechanical property with tensile strength of 3.8 MPa, and stable surface potential of − 270 V. By simply sandwiching the PTFE nanofibrous membrane into two pieces of conducting carbon clothes, a breathable, flexible, and high-performance nanogenerator (NG) device with a peak power of 56.25 μW is constructed. Remarkably, this NG device can be directly used as a wearable self-powered sensor for detecting body motion and physiological signals. Small elbow joint bending of 30°, the rhythm of respiration, and typical cardiac cycle are clearly recorded by the output waveform of the NG device. This study demonstrates the use of electrospun PTFE nanofibrous membrane for the construction of high-performance self-powered wearable sensors.
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高影响因子
RARE METALS
·
2023
·Vol. 42
·期 11
·3886-3896
·
IF 8.8
Xu Can,Hu Xian-Wei,Yu Jiang-Yu,Li Peng-Wei,Liu Ai-Min,Luo Shao-Hua,Shi Zhong-Ning,Wang Zhao-Wen
The knowledge on the ionic structure of YCl 3 -KCl molten system is of guiding significance for the practical production of yttrium metals and yttrium alloys via molten salt electrolysis using this system as electrolyte. In this paper, the theoretical Raman spectra of the ionic groups which may exist in YCl 3 -KCl molten system are simulated by quantum chemical calculation using Gaussian 09 and GaussView 5.0 programs based on density functional theory (DFT). Then the ionic structures of 20 mol%–60 mol% YCl 3 -KCl molten salt systems are studied by comparing the Raman shift values of the bands in the theoretical Raman spectra of different ionic groups with the experimental spectra of this system. YCl 6 3− , Y 2 Cl 7 − , Y 2 Cl 8 2− and Y 2 Cl 9 3− are thought to exist in the molten system. With the increase of temperature, the relative content of YCl 6 3− ionic groups increases while those of Y 2 Cl 7 − , Y 2 Cl 8 2− and Y 2 Cl 9 3− ionic groups decrease. Moreover, the "lifetime" of all ionic groups decreases within the temperature range of 692–730 °C. Meanwhile, the relative contents of Y 2 Cl 7 − , Y 2 Cl 8 2− and Y 2 Cl 9 3− increase with the increase of YCl 3 content, while that of YCl 6 3− decreases. The wave function analysis of the four ionic groups (YCl 6 3− , Y 2 Cl 7 − , Y 2 Cl 8 2− , and Y 2 Cl 9 3− ) is carried out by Multiwfn program. The net charge in each group, the direction of electron migration during the formation of each group, the sites where electrophilic and nucleophilic reactions are most likely to occur in each ionic group, and the order of bond breaking during chemical reactions for the four groups are obtained. Graphical abstract
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高影响因子
Plant Methods
·
2017
·Vol. 13
·期 1
·1-11
·
IF 3.51
Zhang Heng,Chen Zhenyi,Li Taihao,Chen Na,Xu Wenjie,Liu Shupeng
Background
Flos Chrysanthemi , as a part of Chinese culture for a long history, is valuable for not only environmental decoration but also the medicine and food additive. Due to their voluminously various breeds and extensive distributions worldwide, it is burdensome to make recognition and classification among numerous cultivars with conventional methods which still rest on the level of morphologic observation and description. As a fingerprint spectrum for parsing molecular information, surface-enhanced Raman scattering (SERS) could be a suitable candidate technique to characterize and distinguish the inter-cultivar differences at molecular level. Results SERS spectra were used to analyze the inter-cultivar differences among 26 cultivars of Chinese ornamental Flos Chrysanthemum . The characteristic peaks distribution patterns were abstracted from SERS spectra and varied from cultivars to cultivars. For the bands distributed in the pattern map, the similarities in general showed their commonality while in the finer scales, the deviations and especially the particular bands owned by few cultivars revealed their individualities. Since the Raman peaks could characterize specific chemical components, those diversity of patterns could indicate the inter-cultivar differences at the chemical level in fact. Conclusion In this paper, SERS technique is feasible for distinguishing the inter-cultivar differences among Flos Chrysanthemum . The Raman spectral library was built with SERS characteristic peak distribution patterns. A new method was proposed for Flos Chrysanthemum recognition and taxonomy.
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高影响因子
RARE METALS
·
2018
·Vol. 37
·期 6
·488-496
·
IF 1.5
He Zi-Jian,Fan Li-Zhen
High-performance solid polymer electrolyte (SPE) has long been desired for the next-generation high energy density and safe rechargeable lithium batteries. A SPE composed of 80 wt% lithium bis(trifluoromethanesulfonyl)imide (LiTFSI), 20% poly(ethylene carbonate) (PEC) and a polyamide (PA) fiber membrane backbone was prepared by solution-casting method. This solid electrolyte exhibits quite high ionic conductivity and lithium ion transference number ( t + ), and excellent mechanical strength. The as-prepared solid electrolyte shows good wettability to porous electrodes during cycles, which is beneficial to form ionically conductive phase throughout porous electrodes. All-solid-state LiFePO 4 |Li cells assembled with the as-prepared solid electrolyte deliver a high initial discharge specific capacity of 125.7 mAh·g −1 and good cycling stability at 55 °C (93.4% retention at 1C after 200 cycles), and superior cycle performance. Outstanding electrochemical performance can be mainly ascribed to the improved ionic conductivity in the entire porous electrodes due to the good wettability of SPE.
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高影响因子
危险品化学品经营许可证（带存储）