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Showing 1 to 20 of 531 for “"Permeation"”.
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Hydrogen permeation in uncoated and coated X60steel
… PhD research investigates hydrogen diffusion and permeation in API 5L X60 pipeline steel, with a focus on the development and validation of experimental and analytical methodologies to evaluate RF-magnetron-sputtered tungsten coatings as hydrogen permeation barriers. A combined electrochemical and …
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Block copolymer characterization by gel permeation chromatography
… to determine this kind of information was Gel Permeation Chromatography, because, since its introduction in 1964, it has become the most powerful tool for the rapid characterization of homopolymers. The proposed method is introduced by considering a dual-approach: composition distribution …
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An investigation of some factors affecting transdermal permeation.
Factors affecting transdermal permeation were investigated using Differential Thermal Anlaysis (DTA) and in vitro penetration studies of neonatal rat stratum corneum (s.c.), with radiolabelled propanol and hexanol as penetrants. Thermogravimetric Analysis, Thin-Layer Chromatography (TLC) and …
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A study of poly(propylene) by gas permeation.
Thesis (Sc. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1968.
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Composite Membranes: The Permeation of Gases Through Deposited Monolayers
Made available in DSpace on 2014-12-08T23:18:22Z (GMT). No. of bitstreams: 1 6812188.pdf: 4102892 bytes, checksum: b098ae58799e3ca3671fa27b0a8a4458 (MD5) Previous issue date: 1968
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Investigating the Dissolution and Permeation Properties of Flufenamic Acid Cocrystals
… drugs by investigating the dissolution and permeation properties of flufenamic acid cocrystals in the presence of polymers. This study was separated into four tasks: (1) Formation of pharmaceutical cocrystals: Two pharmaceutical cocrystals of poorly water soluble active pharmaceutical …
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An investigation of the effect of surfactants on transdermal permeation.
The aim of this study was to investigate the direct effects of surfactants on the stratum corneum, and thus propose mechanisms of action for these compounds as penetration enhancers. The main methods used in the study were: determination of the permeability of neonatal rat stratum corneum to …
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Microstructure influence on hydrogen permeation and embrittlement of 4140 steel
En esta tesis se han realizado tratamientos térmicos de temple y revenido y diferentes tratamientos de normalizado y recocido sobre un acero estructural de media aleación (grado 4140) y se ha analizado primero su influencia en la microestructura y propiedades mecánicas fundamentales. A …
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Study of vapor/gas permeation using thin immobilized liquid membrane
… successfully developed to describe the VOC-N_2 permeation-separation in a hollow fiber permeator having this special type of membrane containing a thin ILM. Grafting method used for the preparation of a thinner ILM resulted in various hollow fibers having different hydrophilic layer thickness. …
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Membrane permeation from solutions, particle dispersions and particle-stabilised emulsions
… how the rate and extent of membrane permeation of a drug is affected by switching the donor delivery vehicle for different permeants and membranes. The project is funded by an industrial Collaborative Awards in Science and Engineering (CASE) award with an additional sponsorship by …
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Effect of permeation of discharge characteristics of capacitive deionization process
Cost-effective desalination of seawater can be a panacea for the growing freshwater crisis that ranks alongside the problems of shortage of viable energy resources and global warming in terms of its frightening global spread and magnitude. However, the energy guzzling nature of the existing …
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Gas permeation properties and characterization of mitrimid based carbon tubular membrane
… chemical structure, thermal stability, and gas permeation properties by using scanning electron microscopy (SEM), Fourier transform infrared (FTIR), thermal gravimetric analysis (TGA), and pure gas permeation system, respectively. From the results, it is found that the best polymer composition …
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Mechanistic study of nanoemulsion absorption and its application for permeation enhancement
… area, however, the mechanism of nanoemulsion permeation was yet to be explored. The goal of this dissertation was to understand the mechanism of nanoemulsion permeation and to control permeation and bioavailability. The first objective was to delineate the effect of thermodynamic activities of …
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Hydrogen Permeation Through Nickel And Nickel Alloys: Surface Reactions And Trapping
… metal foils have characteristic features whether permeation is diffusion controlled, is influenced by surface reactions or affected by internal trapping.<br></br><br></br>Analysis of data obtained for hydrogen permeation through nickel show that hydrogen is dissociatively chemisorbed in …
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Kinetics of microfine cement filtration during constant rate permeation through sands
Permeation grouting is a cost-effective ground improvement technique that involves the injection of grout into the voids of geological material to improve the engineering properties by reducing the permeability and/or increasing the strength. Permeation grouting can be performed with either …
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Development and gas permeation study of flat asymmetric polyphenylene oxide membranes.
… A membrane with a CO$\sb2$/CH$\sb4$ pure gas permeation rate ratio of 119 and a CO$\sb2$ permeation rate of 6.8 $\times\ 10\sp{-9}$ moles/(m$\sp2$ s Pa) was obtained.
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DEVELOPMENT AND UTILIZATION OF MICROFLUIDIC TRAP (TRYPSIN-BASED RECOVERY AFTER PERMEATION)
Migratory cells in vivo encounter various confining microenvironments throughout the body. In vitro studies of confined migration often use PDMS microchannel devices, but these limit cell extraction for further downstream analysis. Mechanically preconditioning cells with confinement influences …
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Microscopic description of gas permeation and delivery pathways in biological macromolecules
… aa3 and cNOR. I then characterized the permeation of CO2 fixation substrates through the carboxysome shell of cyanobacteria, which is an assembled layer of shell proteins. The results of energetic analysis characterized a pore within each shell protein to be permeable to bicarbonate …
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Analysis of heavy paraffinic Fischer-Tropsch waxes using gel permeation chromatography
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 1983.
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