Improving stability of chloralkaline high-temperature PBI-PEMFCs

Improving Thermal Stability of Starch in Formate Fluids for Drilling High Temperature Shales

Starch is one of the most widely used biopolymers in water based drilling fluids to control fluid loss. The thermal stability of starch in common drilling fluids is low (93 °C). In this study, the thermal stability of starch has been evaluated in sodium/potassium formate and potassium chloride fluids. Samples of mud were prepared by formate salts (sodium and potassium) and potassium chloride wi...

High-Temperature Steam-Treatment of PBI, PEKK, and a PEKK-PBI Blend: A Solid-State NMR and IR Spectroscopic Study

Blends of polyaryletherketones (PAEK) with polybenzimidazole (PBI) are of commercial interest due to their improved upper service temperatures and wear properties when compared with the PAEK analogs examined to date. The retention of properties of the PBI component generally thought to be disadvantageous in more thermally or chemically aggressive environments is not well understood, nor are the...

Thermal curing of PBI membranes for high temperature PEM fuel cells

Three-Dimensional Modeling and Experimental Study of a High Temperature PBI-Based PEM Fuel Cell

This paper investigates the performance of a high temperature proton exchange membrane PEM fuel cell. Both experimental work and numerical simulation are conducted. The high temperature proton exchange membrane is based on polybenzimidazole PBI doped with phosphoric acid. A single cell with triple serpentine flow channels was operated at steady state at various levels of temperature, pressure, ...

Connecting high-temperature and low-temperature protein stability and aggregation

Protein aggregation is a long-standing problem for preservation of proteins in both laboratory settings and for commercial biotechnology products. It is well established that heating (cooling) can accelerate (slow) aggregation by populating (depopulating) unfolded or partially unfolded monomer states that are key intermediates in aggregation processes. However, there is a long-standing question...