Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 869 for “"surfactant"”.
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Surfactant Adsorption Dynamics
The rates of adsorption and desorption of surfactants on solid surfaces were investigated using a packed bed apparatus. Using a first order kinetic expression, adsorption and desorption coefficients were obtained by fitting observed peaks from slug input experiments. All adsorption and desorption …
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Aspects Of Pulmonary Surfactant Metabolism
Pulmonary surfactant stabilizes the lung by reducing the surface tension at the air liquid interface of the alveolus. Phosphatidylcholine represents the principal component of surfactant (70% by weight), other lipids account for 20% of surfactant and the remaining 10% is protein. Four …
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Surfactant aspects of corrosion inhibition
This thesis is concerned with investigating the surfactant aspects of corrosion inhibition. Corrosion inhibitors are of great industrial importance because they are a relatively inexpensive and easily applicable method of protecting oil pipelines against internal corrosion. The performance of …
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Surfactant properties of corrosion inhibitors
… problems in the oil and gas production industry. Surfactant addition is one of many ways to inhibit the corrosion of metals, especially on hard-to-reach surfaces such as the inside of a pipe through which fluid is flowing. The application of small quantities of an inhibitor to production fluids is …
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Surfactant Behavior in Atmospheric Aerosols
… of atmospheric chemistry, hundreds of possible surfactants could exist at a given time in atmospheric aerosols. Therefore, it is imperative to study and understand the formation of organic films and their behavior at atmospherically relevant conditions. In this work, we focus on three main …
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Surfactant instabilities on thin films
The deposition of a surfactant drop over a thin liquid film may be accompanied by a fingering instability. In this work, we present experimental results which identify the critical parameters that govern the shape and extend of the fingering phenomena. It was found that the normalized wavelength, …
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Exogenous surfactant transport through the pulmonary airways : improving surfactant replacement therapy for neonatal respiratory distress syndrome
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1996.
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Physical Chemistry of Gemini Surfactant Monolayers
… of two newly synthesized anionic gemini surfactants (Ace(n)-2-Ace(n), n = 11, 17; Figure 1) at the air-water and air-solid interfaces. The study was further aimed at exploring the miscibility and interactions of the Ace(n)-2-Ace(n) surfactants with perfluorotetradecanoic acid (C13F27COOH; …
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Investigation of surfactant-drug pharmacokinetic interactions
… Ideally, excipients should be chemically inert. Surfactants, in particular, should not alter the permeability or transport of the active pharmaceutical ingredient. However, several studies relating to surfactant characterisation have proven that permeability of tissue could be affected by …
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Penetration of Surfactant Solutions into Capillaries
… studies the processes by which water and surfactant solutions penetrate macroscopic, horizontal, hydrophilic glass capillaries. Additional investigations were conducted on some capillaries that are made hydrophobic by being silanised. A laser is shone along the capillary to illuminate the …
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Foam-surfactant technology in soil remediation
… formed by using two different types of surfactant. TritonX100 and JBR425 were used as representatives of nonionic and anionic surfactants, respectively. The results obtained from this study on a sandy soil showed that foam can be used as a fluid to enhance soil remediation under low …
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Intermediate phases of surfactant - water mixtures
… phases in two non-ionic polyoxyethylene surfactantiD20 systems - nonaethylene glycol mono (1 1-oxa-14,18,22,26-tetramethylheptacosyl) ether (C30E09) and hexaethylene glycol n-hexadecyl ether (C15E05) have been studied. Both systems have a rhombohedral mesh phase with the space group …
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Dynamics in a photoresponsive surfactant system
… much research has been focused on developing surfactants which respond to a particular stimulus (such as temperature, pH, light, etc.), so that properties such as surface tension and viscosity can be controlled using a convenient external trigger. Using light for this purpose has some …
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Single Molecule Study of Polymer-Surfactant Interactions
The interactions between the anionic surfactant sodium dodecyl sulfate (SDS) and a hydrophobically modified non ionic polymer, methylcellulose (MC), have been investigated in aqueous solution by fluorescence correlation spectroscopy (FCS), cryo-TEM, turbidity and rheology. The micelle formation of …
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Photo-reactive Surfactant and Macromolecular Supramolecular Structures
… from a low molar mass gemini ammonium surfactant, N,N–-didodecyl-N,N,N–,N–-tetramethyl-N,N–-ethanediyl-di-ammonium dibromide (12-2-12). Cryogenic transmission electron microscopy (cryo-TEM) and solution rheological experiments revealed micellar morphological transitions of 12-2-12 in …
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Diffusion phenomena in oil-water-surfactant systems
… which occur when oil contacts an aqueous surfactant solution have been investigated. These are important in enhanced oil recovery by surfactant flooding, where the rate of phase equilibration can affect recovery efficiency. Also, they are pertinent to certain mechanisms of detergency. …
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Surface Freezing in Surfactant/Alkane/Water Systems
… monolayers of a homologous series of cationic surfactants, the alkyltrimethyl ammonium bromides (CnTAB where n = 12, 14, 16, 18), as well as a range of non-ionic, zwitterionic and biological surfactants, have been investigated ellipsometrically with a range of n-alkanes (Cm where m = 12 – 20, …
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