China Three Gorges University

About: China Three Gorges University is a education organization based out in Yichang, China. It is known for research contribution in the topics: Catalysis & Landslide. The organization has 11161 authors who have published 8011 publications receiving 82224 citations. The organization is also known as: Sanxia Daxue.

Unusual 3D ZnII coordination networks with mixed tetrahedral and square-planar building units: from 2-fold interpenetrating bbf architecture to self-penetrating 86 topological frameworks

Abstract: Two unusual 4-connected ZnII coordination networks have been successfully constructed from tetrahedral ZnII and square-planar 3,3′,5,5′-azobenzenetetracarboxylate building units with the aid of comparable N-donor bridging spacers [1,3-bis(imidazol)propane and 1,3-bis(imidazol)butane], which direct the distinct 2-fold interpenetrating (64·82)(66)2 (bbf) structure with homochiral double-wall helical tubular motifs and the self-penetrating 86 network, respectively.

microRNA-22 attenuates myocardial ischemia-reperfusion injury via an anti-inflammatory mechanism in rats.

Abstract: Previous studies have reported that microRNA-22 (miR-22) may be implicated in ischemia-reperfusion (I/R)-induced myocardial injury. Our previously published data also demonstrated that miR-22 may protect against myocardial I/R injury via anti-apoptosis in rats by targeting cAMP response element-binding protein binding protein (CBP). However, the specific function of miR-22 in myocardial I/R injury is far from fully elucidated. The present study was designed to investigate another cardioprotective signaling mechanism of miR-22 in myocardial I/R injury. A total of 40 adult male Sprague-Dawley rats were randomly divided into four equal groups (n=10): Sham, myocardial I/R, myocardial I/R with adenovirus expressing scramble miRNA (Ad-Scramble) and myocardial I/R with adenovirus expressing miR-22 (Ad-miR-22) groups. Besides the Sham operation group, the remaining three groups were artificially afflicted with coronary occlusion for 30 min and subsequently reperfused for 4 h. A light microscope was used to observe structural changes in the myocardium; reverse transcription polymerase chain reaction was used to measure the miR-22 mRNA expression level; the myocardial infarct size was analyzed by the Evans Blue/triphenyltetrazolium chloride double-staining; and p38 mitogen-activated protein kinase (MAPK), CBP, c-Jun-activator protein (AP)-1 and phospho (p)-c-Jun-AP-1 expression protein levels were detected by a western blot. Furthermore, ELISA was used to measure the levels of TNF-α and IL-6 in the myocardium. The results demonstrated that adenovirus-mediated miR-22 overexpression markedly reduced p38 MAPK, CBP, c-Jun-AP-1, p-c-Jun-AP-1 expression levels concomitant with an improvement in myocardial injury, including smaller infarct size, reduced release of creatine kinase, lactate dehydrogenase and proinflammation mediators (tumor necrosis factor-α and interleukin-6). These findings suggest that miR-22 has a protective effect on myocardial I/R injury. This protection mechanism, at least in part, is due to its anti-inflammatory function via the suppression of the p38 MAPK/CBP/c-Jun-AP-1 signaling pathway.

Recycling of Lignin and Si Waste for Advanced Si/C Battery Anodes.

Abstract: The ever-increasing silicon photovoltaics industry produces a huge annual production of silicon waste (2.03 × 105 tons in 2019), while lignin is one of the main waste materials in the traditional paper industry (7.0 × 107 tons annually), which lead to not only enormous wastage of resources but also serious environment pollution. Lithium-ion batteries (LIBs) are the dominating power sources for portable electronics and electric vehicles. Silicon (Si)-based material is the most promising anode choice for the next-generation high-energy-density LIBs due to its much higher capacity than the commercial graphite anode. Here, we proposed the use of these silicon and lignin waste as sustainable raw materials to fabricate high-capacity silicon/carbon (Si/C) anode materials for LIBs via a facile coprecipitation method utilizing electrostatic attracting force, followed by a thermal annealing process. The as-achieved Si/C composite featured an advanced material structure with micrometer-sized secondary particles and Si nanoparticles embedded in the carbon matrix, which could tackle the inherent challenges of Si materials, including low conductivity and large volume change during the lithiation/delithiation processes. As expected, the obtained Si/C composite displayed an initial charge capacity of 1016.8 mAh g-1, which was 3 times that of a commercial graphite anode in the state-of-the-art LIBs, as well as a high capacity retention of 74.5% at 0.2 A g-1 after 100 cycles. In addition, this Si/C composite delivered superior rate capability with a high capacity of 575.9 mAh g-1 at 2 A g-1, 63.4% of the capacity at 0.2 A g-1. The utilization of industrial Si and lignin waste provides a sustainable route for the fabrication of advanced high-capacity anode materials for the next-generation LIBs with high economic and environmental feasibility.

Phase evolution and microstructure characteristics of ultrafine Ti(C, N)-based cermet by spark plasma sintering

Abstract: Ultrafine Ti(C,N)-based cermet was prepared by spark plasma sintering (SPS). Experimental examination of phase evolution and microstructural characteristics with X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and selected electron diffraction (SED) at temperature ranging from 1050 to 1430 °C were performed in comparison with conventional vacuum sintering (CVS). It was found that SPS remarkably accelerated phase transformation and decreased the end temperature of some phase transformations. At sintering temperature above 1200 °C, WC and Mo were completely dissolved as well as oxides of TiO 2 and WO 3 were effectively reduced. Of which TiO 2 could not be completely remove in a short span of sintering time. The remainder TiO 2 was presented in form of large blocky grain. TiN was dissolved in TiC with extremely rapid rate below 1200 °C and disappeared above 1200 °C. At a very low sintering temperature denitrification had occurred with a lot of nitrogen loss. Above 1350 °C a new graphite phase was formed with band-like grain distribution and penetrated throughout several Ti(C,N) grain. The prepared ultrafine Ti(C,N)-based cermet with mean grain size of 0.42 μm exhibited typical core-rim surrounding structure. The inner rim phase occupied a relatively great volume fraction related to core and outer rim phases. The well developed inner rim phase resulted in grain growth.