Pneumocephalus following a combined spinal-epidural technique: a case report.

Pneumocephalus refers to the presence of air within the intracranial cavity, and albeit its occurrence following neuraxial techniques is rare, it is commonly associated with a loss of resistance to air technique. This case report describes a parturient who underwent neuraxial analgesia for pain management during labour. Epidural space identification with loss of resistance to saline technique was used and she went on to develop a symptomatic pneumocephalus.

Charge-storage mechanism of highly defective NiO nanostructures on carbon nanofibers in electrochemical supercapacitors.

An electrode composed of highly defective nickel oxide (NiO) nanostructures supported on carbon nanofibers (CNFs) and immersed in an Li+-based aqueous electrolyte is studied using Raman spectroscopy under dynamic polarization conditions to address the charge-storage phenomenon. By this operando technique, the formation of Li2SO4·H2O during the discharge process is verified. At the same time, we observed the phase transformation of NiO to NiOOH.

Synchrotron XRD of Bromide Mediated Li-O Battery.

Li-O battery technology offers large theoretical energy density, considered a promising alternative energy storage technology for a variety of applications. One of the main advances made in recent years is the use of soluble catalysts, known as redox mediators (RM), decreasing the charge overpotential and improving cyclability. Despite its potential, much is still unknown regarding its dynamic, especially over higher loading electrodes, where mass transport may be an issue and the interplay with common impurities in the electrolyte, like residual water.