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Biomineralized dipeptide self-assembled hydrogel with ultrahigh mechanical strength and osteoinductivity for bone regeneration
No full textPeptide self-assembled hydrogels are ideal scaffolds for three-dimentional cell culture and tissue engineering due to their native extracellular matrix enabling the transport of nutrients as well as the cells growth and expansion. However, the use of peptide hydrogels in the hard tissues regeneration such as alveolar and skull bone has been largely unexplored, hindered by the insufficient mechanical strength and osteogenesis activity. Herein, peptide self-assembled nanostructures are used as templates to emulate natural biomineralization process. The vaterite nanoparticles loaded with thermolysin act as a role of mature osteoblasts secreting collagen fibrils to initiate dipeptide self-assembly as biomimetic extracellular matrix. Meanwhile, the vaterite nanoparticles with a high specific surface area form strong intermolecular and interfacial interaction with hydrogel networks, acting as a cross-linker to achieve extrafibrillar mineralization. Moreover, vaterite nanoparticles function as a mineral reservoir to release Ca2+, inducing intrafibrillar mineralization, further enhancing the mechanical property. The resulting hydrogel exhibits an unprecedently high value of storage modulus (473 kPa), excellent biocompatibility and osteoinductivity. In rat calvarial defect model, the hydrogel significantly accelerates regeneration of osteogenesis tissue, thus indicating the potential of such peptide hydrogels for application in bone regeneration
High performance BaCO3-CeO2 composite catalyst for solvent-free selective oxidation of cyclohexane with molecular oxygen
No full textBaCO3-CeO2 composite catalysts were prepared by the hydrothermal synthesis method, and the influence of Ba/ Ce on the structural and catalytic performance for selective oxidation of cyclohexane with molecule oxygen was studied. The characterization results exhibited that the doping amount of BaCO3 would influence the morphology, the content of surface Ce3+ and surface oxygen species (O beta), and alkalinity. Meanwhile, the amount of alkali is the key to the decomposition of cyclohexyl hydrogen peroxide (CHHP). 10.5% conversion of cyclohexane and 85.0% selectivity of KA oil were achieved under the reaction conditions of 1.0 MPa O2 and 150 degrees C for 2 h. The excellent catalytic activity was attributed to its high atomic ratios of Ce3+/Cetotal and O beta/Ototal on the surface and optimal redox capacity
A novel gas removal method for the removal of C2H2 in calcium carbide slag slurry by fine bubbles combined with air purging: performance, mechanism, and in situ bubble imaging analysis
No full textAbout 60% of carbon emissions in the cement industry come from the decomposition of limestone. As a key low -carbon technology of raw material substitution, calcium carbide slag (CCS, low-carbon calcareous material) can replace limestone to produce cement, desulfurizer, and other products, which can achieve carbon emission reduction and the upcycling of CCS. However, the release of residual C2H2 in CCS brings safety and environ-mental risks, which seriously restricts the upcycling of CCS. In this study, a novel gas removal method of fine bubbles (FBs) degassing was proposed for the removal of C2H2 in solid CCS particles, and an advanced in situ bubble imaging technology was used to investigate the performance and mechanism of C2H2 removal. The results indicated that approximately 70% of C2H2 (encapsulated C2H2) in CCS was difficult to remove by drying or slurrying. Under the optimal condition, the C2H2 removal efficiency was approximately 61.0%, and the amount of C2H2 released from the CCS slurry decreased by 92.9%. In the process of FBs degassing, large CCS particles in the CCS slurry were broken up into fine particles via the erosion mechanism, thus promoting the reaction of the encapsulated calcium carbide with water to produce C2H2. The generated C2H2 was dissolved in the slurry and could be quickly removed by FBs (<500 mu m) with a fast mass transfer rate under the slight negative pressure. This work provides a novel gas removal method for effectively removing C2H2 in CCS and avoiding security and environmental risks, provides technical support for the upcycling of CCS, and provides a reference for the sep-aration of other similar multiphase systems (e.g., gas-liquid/gas-liquid-solid, oil-liquid/oil-liquid-solid)