polyacrylonitrile (pan) membranes with nano-porous surface and high hydrophilicity were fabricated by addition of polyoxyethylene (40) nonylphenyl ether (igepal) as an additive in the casting solution. the membranes were prepared from pan/igepal/1-methyl-2-pyrrolidone (nmp) via phase inversion induced by immersion precipitation technique. pure water was used as coagulation medium. the effects o...

A triple-layer composite membrane with porous-dense-porous structure was proposed to develop a high performance membrane reactor. The triple-layer composite membrane consists of a porous Sr0.7Ba0.3Fe0.9Mo0.1O3 δ (SBFM) layer, a dense 0.5 wt% Nb2O5-doped SrCo0.8Fe0.2O3 δ (SCFNb) layer and a porous La0.8Sr0.2MnO3 δ–yttria stabilized zirconia (LSM/YSZ) layer. The porous layers can effectively redu...

a palladium composite membrane was prepared by electroless plating on oxidized porous stainless steel support (ox-pss). hydrogen permeation flux through this composite membrane was measured in the temperature range of 574-674k and the pressure difference of two sides of membrane up to 90kpa. a simplified resistance model was employed to analyze the permeation behavior of hydrogen through pd/ox-...

In this paper, we perform two-dimensional simulations of cross-flow forward osmosis (FO) membrane modules in the presence of draw and feed channel spacers. For this purpose, the equations corresponding to the conservation of mass, momentum, and convection-diffusion for the mass fraction of solute are solved using a commercial finite volume flow solver. We consider six configurations of channel ...

this paper focused on a novel method of electroless plating ruthenium (ru) on solid or porous substrates like porous stainless steel (pss) discs or ceramic tubes. a novel complexing plating bath of ru was developed. it is proven that ru can be deposited directly on these substrates by the bath at a temperature of 328 k and strong alkaline environment. tga, sem, edx and xrd confirmed the success...

A porous-dense dual-layer composite membrane reactor was proposed. The dual-layer composite membrane composed of dense 0.5 wt % Nb2O5-doped SrCo0.8Fe0.2O3-d (SCFNb) layer and porous Ba0.3Sr0.7Fe0.9Mo0.1O3-d (BSFM) layer was prepared. The stability of SCFNb membrane reactor was improved significantly by the porous-dense dual-layer design philosophy. The porous BSFM surface-coating layer can effe...

A new method is developed to enhance the gas separation properties of mixed matrix membranes (MMMs) by interior modification of an inorganic nano-porous particle. Ship-in-a-bottle (SIB), as a novel synthesis strategy, is considered to encapsulate a polyaza macrocyclic Ag-ligand complex into the zeolite Y, which is resulted in a new host-guest nano-composite. It is consequently incorporated into...

background: different methods have been suggested to preserve bone architecture following traumatic events such as teeth extraction. the purpose of the study was to histologically and histomorphometrically evaluate the dental socket healing after applying porous titanium granules (ptg) in dogs. materials and methods: four healthy male dogs were involved in the present 6-weeks experimental anima...