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Effect of ionic crosslinking on morphology and thermostability of biomimetic supercritical fluids-decellularized dermal-based composite bioscaffolds for bioprinting applications
No full textIn the present study, supercritical fluid was employed to prepare a kind of supercritical fluids-decellularized dermal-based scaffold (SFDDS) from porcine dermal tissue. Further, new composite bioscaffolds containing SFDDS were designed for bioprinting applications. Then, the effect of crosslinking functionality on microstructures and thermal properties of the composite bioscaffolds containing decellularized extracellular matrix were studied. The results of thermal stability from thermogravimetric analysis and difference thermogravimetry demonstrated the structural stability of the composite bioscaffolds. A method was designed to prepare bioinspired decellularized dermal-based composite bioscaffolds, which were further characterized by infrared spectroscopy, scanning electron microscopy, and thermogravimetry analysis
Molten-salt-mediated synthesis of Na+ doped Bi4TaO8Cl nanosheets with exposed {001} facets for enhanced photocatalytic degradation
No full textRegulating the exposed surfaces of semiconductors is believed to be a versatile strategy to boost their photoactivity. Herein, the Na+ doped Bi4TaO8Cl (BTOC) nanosheets with the exposed {001} active faces were synthesized via a facile molten salt method. The size of BTOC nanosheets could be readily tuned by con-trolling the feeding content of the molten salts (NaCl and KCl). Benefited from the cooperative effect of the Na+ doping and the exposed active {001} facets, the optimal BTOC-24 nanosheets exhibited high photo activity. Under 5 W white LED light irradiation, the degradation rates of BTOC-24 nanosheets for ofloxacin (OFL) and Rhodamine B (RhB) were 84.1% and 97.3%, which were drastically enhanced by 2 and 6-folds than that of bulk BTOC, respectively. The mechanism for the improved photoactivity was also investigated. This work demonstrates the synergetic effect of engineering the thickness and exposed crystal face towards the enhanced photoactivity of 2D BTOC, which also shows significant implications for designing other 2D semiconductor nanosheet with efficient environmental remediation performance. (c) 2022 Elsevier B.V. All rights reserved
A 3D bioprinted tumor model fabricated with gelatin/sodium alginate/decellularized extracellular matrix bioink
No full textTissue-engineered scaffolds are more commonly used to construct three-dimension-al (3D) tumor models for in vitro studies when compared to the conventional two-dimensional (2D) cell culture because the microenvironments provided by the 3D tumor models closely resemble the in vivo system and could achieve higher success rate when the scaffolds are translated for use in pre-clinical animal model. Physical properties, heterogeneity, and cell behaviors of the model could be regulated to simu-late different tumors by changing the components and concentrations of materials. In this study, a novel 3D breast tumor model was fabricated by bioprinting using a bioink that consists of porcine liver-derived decellularized extracellular matrix (dECM) with different concentrations of gelatin and sodium alginate. Primary cells were removed while extracellular matrix components of porcine liver were preserved. The rheolog-ical properties of biomimetic bioinks and the physical properties of hybrid scaffolds were investigated, and we found that the addition of gelatin increased hydrophilia and viscoelasticity, while the addition of alginate increased mechanical properties and porosity. The swelling ratio, compression modulus, and porosity could reach 835.43 +/- 130.61%, 9.64 +/- 0.41 kPa, and 76.62 +/- 4.43%, respectively. L929 cells and the mouse breast tumor cells 4T1 were subsequently inoculated to evaluate biocompatibility of the scaffolds and to form the 3D models. The results showed that all scaffolds exhibited good biocompatibility, and the average diameter of tumor spheres could reach 148.52 +/- 8.02 mu m on 7 d. These findings suggest that the 3D breast tumor model could serve as an effective platform for anticancer drug screening and cancer research in vitro
A regenerative core-shell LTA@LDH adsorbent for indoor dehumidification and its improved adsorption performance
No full textDehumidification is vital for human health and environmental sustainability. However, traditional moisture adsorbents have the problems like low adsorption capacity, high regeneration energy consumption and negative impacts to environment. As a result, it is demanding to develop environmentally friendly adsorbents with desirable adsorption capacity and convenient regeneration. Herein, a Linde type A zeolite@Mg-Al layered double hydroxides (LTA@LDH) with core-shell structure is synthesized by a facile in-situ co-precipitation method and used for indoor dehumidification. The LTA@LDH with hierarchically porous structure presents advantageous synergism of micro-mesopores, and exhibits a better adsorption and desorption performance than the pure LTA. The whole water uptake capacity of LTA@LDH is 0.339 g.g- 1 in relative humidity 95 % & 30 degrees C, much higher than that of pure LTA (0.248 g.g(-1)). The desorption activated energy of LTA@LDH is 53.92 kJ.mol(-1), nearly half of pure LTA (88.63 kJ.mol(-1)), indicating its superior desorption performance. The adsorption activity of LTA@LDH remains unchanged after fifteen consecutive adsorption-regeneration cycles. Based on various characterizations, a three-stage dehumidification model of LTA@LDH was proposed to reveal its unique sorption behaviors: (1) capillary condensation mainly in LTA's micropores; (2) mono-layer order water absorbed in LDH's mesopores; and (3) multi-layer water absorbed in LDH's mesopores. This work provides a new approach to design and develop zeolite-based adsorbents by introducing LDH and designing unique core-shell structure
The critical role of scale resolution in CFD simulation of gas-solid flows: A heat transfer study using CFD-DEM-IBM method
No full textThe surface-to-bed heat transfer coefficient is an important engineering parameter for quantifying the heat transfer capability of fluidized beds. In this study, computational fluid dynamics-discrete element method-immersed boundary method (CFD-DEM-IBM method) is used to simulate the velocity and tem-perature fields around the immersed tube in two fluidized beds, the heat transfer coefficients of fluid-wall, particle-wall, and particle-fluid-wall are then analyzed and compared with experimental data. It is shown that in order to quantitatively predict the surface-to-bed heat transfer coefficient without using empirical correlations, the thermal boundary layer of gas phase that is of the order of particle diameter needs to be explicitly resolved by refining the fluid grid around the immersed tube up to 1=16 of particle diameter, whereas an empirical correlation is necessary to correctly calculate it in the state-of-the-art CFD studies which have used coarse grids. Present study highlights the critical role of scale resolution (specifically, the explicit resolution of the thermal boundary layer) in the study of surface-to-bed heat transfer in gas-solid fluidized beds.(c) 2022 Elsevier Ltd. All rights reserved
The dual-active-site tandem catalyst containing Ru single atoms and Ni nanoparticles boosts CO2 methanation
No full textHydrogenation of CO2 into CH4 is an effective strategy for dealing with CO2-relevant environmental problems. Since the CO2 methanation reaction involves multiple electron transfers and various C-1 intermediates, improving the reaction rate at each step is critical to accelerating the entire reaction. Here, we report a dual-active-site tandem catalyst (Ru1Ni/CeO2) composed of Ru single atoms (Ru-1) and Ni nanoparticles, which can effectively convert CO2 to CH4, showing similar to 90% CO2 conversion and similar to 99% CH4 selectivity at 325 degrees C, much higher than those of the Ru-1/CeO2 and Ni/CeO2 catalysts. Experimental and theoretical calculation results reveal that Ru-1 is extremely active for converting CO2 to CO, while the Ni site is highly efficient for the subsequent sequential CO to CH4 reaction step. The coexistence of the Ru-1 and Ni sites significantly boosts the overall reaction. This work offers a promising strategy for the rational design of efficient multisite tandem catalysts
