查看更多>>摘要：A toad egg-inspired structure comprising bismuth (Bi) nanoparticles (NPs) contained in a carbon microrod shell (Bi@C) was synthesized via the one-pot supercritical acetone (scAct) route and subsequent carbonization. During the formation of Bi NPs in scAct in the presence of nitric acid, a few decomposed acetone molecules acted as carbon sources, which generated an albumen-like N-doped carbon microrod with an average shell thickness of 38 nm and were embedded with yolk-like Bi NPs having size in the range of 30-200 nm. The densely packed Bi NPs inside the carbon micron shell resulted in a high Bi loading of 78 wt%. When utilized for Li storage, the Bi@C delivered a high reversible capacity of 337 mAh g(-1) after 70 cycles at 0.05 A g(-1), long-term cyclability of 0.04 decay per cycle for 1000 cycles at 1 A g(-1), and high volumetric energy density of 870 mAh cm(-3). The use of a mixed ether- and ester-based electrolyte in the Bi@C cell reduced the resistivity and increased the capacitive contribution, thereby resulting in a better high-rate performance and long-term stability than those obtained using conventional ester-based electrolytes. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Patil, Komal N.Prasad, DivyaManoorkar, Vilas K.Bhanushali, Jayesh T....
10页
查看更多>>摘要：Production of y-butyrolactone (GBL) from vapour-phase dehydrocyclization of biomass derived 1,4butanediol is considered as more sustainable and significantly commercial industrial process. In this regards, Cu-based catalyst was designed with ZnAl2O4 spinel support and CeO2 as a promoter to obtain Cu/ZnAl2O4-CeO2 catalyst with different Cu:Ce mass ratio. The catalysts were characterized by XRD, H2-TPR, FT-IR, CO2-TPD, FE-SEM and BET analysis and then tested for the production of ybutyrolactone (GBL) by dehydrocyclization of 1,4-butanediol (BDO). Further, various reaction parameters were optimized and their effects on the catalytic activity were studied to obtain maximum yield towards desired product at ambient reaction conditions. The results revealed that metallic Cu species and CeO2 as a promoter were highly dispersed on ZnAl2O4 support with appreciable surface area. Additionally, CeO2 as a promoter prevented agglomeration, increased the basic character of catalyst to selectively obtain GBL as a major product. 10 wt% Cu/ZnAl2O4-10 wt% CeO2 catalyst exhibited excellent yield (94%) towards GBL product with tetrahydrofuran (THF) as the only by-product and demonstrated consistent activity and selectivity during 26 h time on stream. Further, the optimized catalyst displayed appreciable recyclability performance up to seven recycles without much loss in its catalytic performance making the catalyst feasible at industrial scale. (c) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Ozonation process alone is not sufficient to remove both the SO2 and NOX gases, when treated simultaneously. Therefore in this work, a suitable technique to remove SO2 and NOX simultaneously has been evaluated using combination of O-3, H2O2 and a solid catalyst. OMS-2, a manganese based catalyst have been incorporated with O-3 and H2O2 for enhanced radical generation. This preferably enhances the oxidation of SO2 and NOx species in aqueous medium simultaneously. The role of some important process parameters have been tested on the performance of SO2 and NOX absorption. To get the maximum removal of SO2 and NOX, the neutral pH, temperature close to 300-320 K, and H2O2 at 0.2 mol L-1 concentrations was found to be the optimum condition. The use of catalyst (approximately 2 g L-1) + O-3 + H2O2 shows promising results on the removal of SO2 and NOX. In addition to that, the kinetics of the catalytic ozonation and peroxone removal of SO2 and NO2 has been evaluated. The cost estimation study for the ozone and peroxone based catalytic processes has been presented with comparison of the respective flue gas %removal. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：As one of the specific biomarkers of anthrax, timely, sensitive and accurate detection of 2,6-dipicolinic acid (DPA) plays an important role in preventing biological weapons attacks and disease outbreaks. Here, multiemission Eu3+/covalent-organic framework (COFDTA-TFP) and Tb3+/COFDTA-TFP were constructed by the coordination between Eu3+ or Tb3+ with fluorescent COFDTA-TFP which was prepared by amine-aldehyde dehydration condensation between 2,5-diaminoterephthalic acid and 2,4,6-triformylphloroglucinol for the first time. The Eu3+/COFDTA-TFP and Tb3+/COFDTA-TFP can emit non overlapping fluorescence of COFDTA-TFP and Eu3+ or Tb3+, which was used to ratiometric detection of DPA. Due to the strong coordination between the nitrogen atoms in the pyridine ring and the oxygen atoms in the carboxyl group of DPA with Eu3+ or Tb-3+,Tb- DPA replaced coordinated H2O to sensitize fluorescence of Eu3+ or Tb3+ by "antenna" effect but fluorescence of COFDTA-TFP with two-dimensional lamellar structure was kept constant as a reference. The linear range and detection limit of ratiometric fluorescence sensor based on Eu3+/COFDTA-TFP for detection of DPA are 0.01-12 mu M and 4.2 nM, respectively. The linear range and detection limit of ratiometric fluorescence sensor based on Tb3+/COFDTA-TFP for detection of DPA are 0.01-9.0 mu M and 2.9 nM, respectively. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：The inhibition of protein unfolding and self-assembly into fibrils using nanoparticles is a potential medicinal strategy to impede amyloid-related diseases. Among various nanoparticles, fullerenes have attracted great interest because of their inhibition effect on protein fibrillization, but the mechanism of the inhibition process is not properly understood. To explore the inhibition mechanisms, molecular dynamics simulations of hen egg white lysozyme (HEWL), a model of an amyloid-prone protein, have been performed in the presence of varied C60 concentrations. It is found that the structural fluctuation of HEWL decreases as the concentration of C60 increases. As the concentration of C60 increases, clustered fullerene aggregates are formed via hydrophobic interaction rather than interacting with HEWL, and HEWL was adsorbed on the surface of the fullerene aggregates. The maintenance of the structure and the inhibition of HEWL fibrillization by C60 is also experimentally confirmed by thioflavin T fluorescence assays and atomic force microscopy. Thus, two independent methods confirmed that C60 is able to inhibit the formation of amyloid fibrils in a dose-dependent manner. This study is an initial step in understanding by which mechanism C60 inhibits HEWL fibrillization, allowing to further design strategies for amyloid inhibition based on fullerenes and other nanoparticles. (c) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Triple-negative breast cancer constitutes 15 - 20% of all breast cancer and is considered one of the most aggressive forms of breast cancer. Clinical studies have suggested that the high numbers of infiltrating tumor-associated macrophage (TAM) act as a critical contributor behind the aggression of TNBC. Therefore, this study was focused on the preparation of a TNBC spheroid model with M2-like macro-phages (M2-M) since it closely simulated the tumor microenvironment observed in clinical TNBC tumors. High EGFR expression in TNBC highlights the importance of cetuximab (Cmab)-assisted cellular internal-ization into the EGFR overexpressing TNBC cell line. The Cmab-anchored gold nanorod (GNR)-mediated photothermal approach was successfully developed to treat the TAM-infiltrated TNBC spheroid model. MDA-MB-231 spheroids with a diameter of 260 +/- 10 lm were successfully prepared. An increase in the IC50 of doxorubicin in MDA-MB-231 spheroids with M2-M compared to the without M2-M group sug-gested that TAM-mediated development of resistance. The in vitro cytotoxicity assay demonstrated that there was elevated apoptosis expression (PARP and caspase-9), cell cycle arrest (G2/M phase), and cyto-toxic effects following treatment with Cmab-GNR plus NIR irradiation. Moreover, there was no significant difference between the cytotoxic effect of Cmab-GNR plus NIR with M2-M and without M2-M group. Thus, our study highlighted that Cmab-GNR with NIR were able to overcome TAM-acquired resistance in the tumor model, which might be due to the polarization of the protumoral phenotype to the antitu-moral phenotype. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：The aim of this work was to improve the dissolution properties of poorly soluble drug sulfasalazine (SSZ) by encapsulation in the metal organic framework based on y-cyclodextrin (yCD-MOF). Loading of SSZ in the framework was successfully performed by impregnation and co-crystallization methods. The obtained composites yCD-MOF/SSZ were investigated by several methods, including PXRD, N2 physisorption, FTIR, solid 13C NMR, SEM, and DLS. The SSZ release from yCD-MOF was examined with in vitro dissolution studies using simulated gastric and intestinal fluids. Sulfasalazine loaded in yCD-MOF exhibited the improved release. Release profiles of SSZ were compared and analyzed using different kinetic models. Some efforts were made to reduce the burst release of SSZ from yCD-MOF in the phosphate buffer (pH 6.8). Influence of y-cyclodextrin on the membrane permeability of SSZ was examined. (c) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
Park, Da JungHan, MyeongjinPark, Mi JungLee, Joo-Yul...
7页
查看更多>>摘要：It is highly important to design and develop appropriate insoluble anodes for industrial Cu electroplating to lower the amount of organic additives that this process consumes. Conventionally, this rapid consumption of additives (e.g., brighteners, suppressors, or levelers) is known to be due to the active radical species (e.g., .OH) formed during oxygen evolution. In this study, we found that trace amounts of chloride ions present in the electroplating bath are the source of the active chlorine species that accelerate the breakdown at the insoluble anode. A sacrificial, perfluorinated polymer coating effectively decreased the emission of active chlorine species from the electrode, thereby lowering the consumption of the brightener. This study reveals that the suppression of chlorine evolution at the anode can be an effective approach for decreasing brightener consumption during Cu electrodeposition. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：In this work, platinum nanoparticles (Pt) decorated on a spinel group, zinc cobalt oxide (ZnCo2O4) 3-D flower was intended to detect caffeine electrochemical sensor. Pt particles were used to enhance the performance of hydrothermally prepared 3-D ZnCo2O4 flower. So Pt nanoparticles were decorated on each thin nanosheet of self-assembled 3-D flower-like ZnCo2O4. The thin transparent nanosheet of the ZnCo2O4 flower will benefit electrochemical sensors by simplifying its ion exchange. Therefore, Pt@ZnCo2O4 shows an excellent electrochemical conductivity, which promotes the caffeine-based sensor's rapid electrochemical oxidation. Using amperometric i-t at an applied potential of 1.45 V, Pt@ZnCo2O4 modified electrode shows widespread of two linear ranges (0.05 to 265.55 lM and 295.55 to 757.55 lM) with a low detection limit (0.0114 and 0.01657 lM) and high sensitivity (3.419 and 1.862 lA lM-1 cm-2). Moreover, good results were obtained for the real-time detection of caffeine in sugar-free cola beverage and energy drink samples. Henceforth, the developed method could be an ideal way to detect caffeine in real samples. CO 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
查看更多>>摘要：Ring-like residual deposits are often observed after drying suspension droplets on surfaces. That introduces a crucial defect in practical applications, such as ink-jet printing that requires a uniform deposit. In this study, depositions after drying sessile/pendant droplets with silica/polystyrene particles were examined to identify the effect of gravitational sedimentation of particles on self-pinning and deposition pattern. The suspension droplet with larger polystyrene (or silica) particles would trigger the self-pinning at larger (or smaller) particle concentrations. The deposition pattern of pendant drops with silica particles is hill-like. This is due to the large density difference between silica and water to induce high sedimentation velocity, and the particles would precipitate and aggregate along the air-liquid interface to form a hollow shell deposit. The depositions for suspensions with bi-dispersed particles, the larger silica particles would accumulate at the bottom of the deposit due to the higher sedimentation velocity, in contrast to the well-mixed in the deposits for bi-dispersed polystyrene particles. The sedimentation and capillary flow velocities were calculated and discussed. These new findings reveal that the particle density (gravity effect) can be used to adjust the sedimentation velocity to control the deposition morphology and particle size distribution even to suppress the coffee-ring effect. CO 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.
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