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IMAGE: ELECTROCHEMICAL CO2 CONVERSION IS ONE OF THE MOST PROMISING STRATEGIES TO ACHIEVE CARBON NEUTRALITY. CARBON NANOFIBER ENCAPSULATED BISMUTH NANOPARTICLES WERE SYNTHESIZED THROUGH ELECTROSPINNING-PYROLYSIS TECHNIQUES, WHICH EXHIBITED EXCELLENT FORMATE SELECTIVITY AND ULTRAHIGH MASS ACTIVITY, PROVIDING A POTENTIAL ALTERNATIVE FOR THE LARGE-SCALE PREPARATION OF ELECTROCATALYSTS AND INDUSTRIALIZED APPLICATION IN ELECTROREDUCTION CO2 TO FORMATE. CREDIT: CHINESE JOURNAL OF CATALYSIS What is noteworthy is that the aggregation of the metal nanoparticles might diminish the available active sites and consequently reduce the actual utilization of metal composition. The researchers introduced carbon nanofibers as the support, which can confine the Bi metal aggregation during the pyrolysis and catalysis process, exposing more active sites while improving the stability of catalysts. The as-prepared electrocatalyst, Bi/CNFs-900, demonstrated outstanding selectivity to formate (> 90%) in a neut
In a new study using a rat model of Crohn’s disease, a biodegradable hydrogel composite loaded with stem cells, developed by Johns Hopkins Medicine researchers, in a collaborative effort with the Whiting School of Engineering, has shown significant success in treating perianal fistulas (PAF) — one of the many complications of Crohn’s disease.
The existing 3D-printed scaffolds commonly possess a thick feature size of hundreds of micrometers, which is too large for most cells (10–20 μm) to attach and proliferate for promoting tissue regeneration. Researchers from Xi’an Jiaotong University have developed a novel hybrid manufacturing technique for the fabrication of composite scaffolds with 3D-printed macroscale frameworks and aligned nanofibrous architectures to improve cellular organizations.
This study is led by Dr. Wenxia Liu (State Key Laboratory of Biobased Materials and Green Papermaking, Qilu University of Technology, Shandong Academy of Science). To uniformly disperse LM into hydrogel, she conceived and designed using CCNFs rich in quaternary ammonium groups to encapsulate LM droplets through an approach of Pickering emulsion. “The strong electrostatic attraction and ion-dipole interaction between the quaternary ammonium groups of CCNFs and the hydroxyl groups on LM droplet surfaces were expected to prevent the LM droplets from aggregation and coalescence. The incorporation of CCNFs into hydrogel with the LM droplets was also expected to improve the mechanical properties of hydrogel by forming a reversible hard polymer network. “Using CCNFs to prevent LM droplets from coalescence is a strategy of more with less” Liu says. Master degree candidate Mr. Shihao Wu further designed the polymer matrix for the conductive hydrogel. “By inducing acrylic acid (AA) polymerizatio