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In the context of refinery gas testing, we studied the potential of a micro-gas chromatograph (??GC). For this purpose, we fabricated a new type of gas microvalve, based on a polyetheretherketone (PEEK) membrane, which is suitable for the harsh environment of natural gas. Experimental results are presented along with simulations to describe and discuss the static and dynamic behaviors of such a device.
Novel membranes were prepared through covalently coupling of chitosan (CS) to activate nylon membrane after the reaction of the microporous nylon membrane with formaldehyde. Non-specific adsorption on the CS-coated nylon membrane decreased greatly. Yellow 3G-P/Reactive Red 120 were then covalently immobilized onto composite membrane as dye ligands. These Red 120/Yellow 3G-P-CS-membranes were used...
Electrospun nylon-6 nanofibrous membrane with fiber diameters in the range of 50-200 nm were prepared and employed as affinity membrane material for papain adsorption due to their excellent chemical and thermal resistance as well as high wettability. In this work, covalent coupling of chitosan (CS) to activated nylon membrane was performed after the reaction of the nanofibrous nylon membrane with...
Nylon membranes are first hydrolyed with dilute HCl and then treated with chitosan before being used as the affinity carrier. Papain as a ligand has been immobilized on the activated membranes with glutaraldehyde as a crosslinking agent. The factors involving with the activity of immobilized papain, such as concentration of glutaraldehyde, pH, temperature, reaction time, and the amount of added papain...
Ion mobility spectrometry (IMS) is a technique commonly used for trace detection of hazardous chemicals. The inlet of an IMS typically utilizes a membrane made of generic polymers such as polydimethylsiloxane or polyvinylidene fluoride. These membranes are designed to allow analytes through but protect the detector from dust and keep a controlled relative humidity and pressure. IMS signals can be...
The transport of a gas or vapour through a dense, nonporous membrane can be described in terms of a solution-diffusion mechanism, which states that the permeability is determined by its diffusivity and solubility. The solubility of many different molecules in many different polymers has been measured and can be found in the literature. However, very little information can be found about the solubility...
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