Polyvinylidene fluoride/polyvinylpyrrolidone (PVDF/PVP) hollow fiber membranes were fabricated by dry-jet wet-spinning process. The correlated effects of the air gap length and PVP concentration ((1) the air gap length effect at the low and high PVP concentration in the dope solutions, as well as (2) the effect of the PVP concentration at the same air gap length) on the cross-section structure ...

Keratin micro-tubes were obtained by heating medullated keratin fibres to temperatures above 230°C under nitrogen atmosphere, when, as documented by microscopy, the cortex (the core of the fibre) melts from the medulla outwards, followed by pyrolysis of the material through the remaining solid cuticle (shell) layer. The resulted hollow tubes from fibres void of cortical material keep the extern...

Abstract In this work, hollow fibre ultrafiltration (UF) membrane operating under gravitational force were used to treat Escherichia coli bloomed water as well contaminated surface water. The biofouling propensity of the UF was investigated. results showed that after single filtration using gravitational-driven unit, E. cells accumulated on and gave fair rejection 86.35–90.22% for initial conce...

Axisymmetric vibration of an infinite Pyrocomposite circular hollow cylinder made of inner and outer pyroelectric layer of 6mm-class bonded together by a Linear Elastic Material with Voids (LEMV) layer is studied. The exact frequency equation is obtained for the traction free surfaces with continuity condition at the interfaces. Numerical results in the form of data and dispersion curves for th...

The present study describes and validates a novel yet simple system for simultaneous in vivo measurements of rates of aquatic CO2 production (ṀCO2 ) and oxygen consumption (ṀO2 ), thus allowing the calculation of respiratory exchange ratios (RER). Diffusion of CO2 from the aquatic phase into a gas phase, across a hollow fibre membrane, enabled aquatic ṀCO2  measurements with a high-precision in...

The presented study focuses on inspecting the dependency between process conditions, especially permeate and retentate pressure component recovery of H2, CO, CO2 during a membrane separation model syngas. Experiments with both pure components mixture were performed using laboratory unit Ralex GSU-LAB-200 polyimide hollow fibre module 3000 fibres. Permeability values established at 1380 Barrer f...

Dye infusion experiments into brain surrogates were conducted to quantify the volume of distribution as a function of infusion parameters and catheter configurations. A hollow membrane multi-port catheter was tested for dye distribution and reflux of the infusate. Its performance was compared to a simple single port catheter. The dye distribution pattern was more even in the hollow membrane cat...