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  • About
  • The Global ETD Search service is a free service for researchers to find electronic theses and dissertations. This service is provided by the Networked Digital Library of Theses and Dissertations.
    Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
11

The adsorption of polydisperse nonionic surfactants at the solid/aqueous interface

Aston, Jeffrey Roy January 1987 (has links)
A high resolution capillary gas chromatography technique has been adapted to the analysis of polydisperse non-ionic surfactants. This technique has enabled the complete characterization of the oligomer distributions of very small samples of surfactants (typically 0.1 µg to 0.5 µg). It has made possible the determination of changes in the oligomer distribution on adsorption of surfactant at the solid/aqueous interface. Isotherms have been measured for the adsorption of a series of polyoxyethylene nonylphenol surfactants from aqueous solution on to various solids. These isotherms indicate that the surfactant – surface interaction increases with an increase in the hydrophobicity of the adsorbent. They also show a dependence upon the average length of the ethylene oxide chain and the ratio of the surface area/solution volume. These latter factors affect both the total partition of surfactant between the surface and the solution, and also the selectivity of the solid surface. A detailed study of the adsorption of N8 (a commercial non-ionic surfactant) by a precipitated silica at various surface area/solution ratios, has been undertaken, where the equilibrium surfactant oligomer distributions in the adsorbed and solution phases have been determined. At surfactant concentrations above the critical micelle concentration, the phase separation approach has been used to estimate the surfactant oligomer distributions in free monomer solution and in micelles. This information has been combined with a surface phase model to interpret the results of the adsorption distribution studies.
12

The synthesis and characterization of novel surfactants

Mendoza, Alvaro. January 2006 (has links)
Thesis (Ph. D.)--University of Wyoming, 2006. / Title from PDF title page (viewed on June 30, 2008). Includes bibliographical references.
13

Synthesis and characterization of novel amphiphiles

Jose, Robin. January 2006 (has links)
Thesis (Ph. D.)--University of Wyoming, 2006. / Title from PDF title page (viewed on June 30, 2008). Includes bibliographical references.
14

Structural studies of surfactants at air-water interfaces and reverse-phase chromatographic interfaces using sum-frequency spectroscopy and 2-D correlation analysis /

Henry, Matthew C., January 2003 (has links)
Thesis (Ph. D.)--Lehigh University, 2003. / Includes bibliographical references and vita.
15

Precipitation of surfactants and surfactant mixtures in aqueous solutions /

Stellner, Kevin Lance, January 1987 (has links)
Thesis (Ph.D.)--University of Oklahoma, 1987. / Bibliography: leaves 171-177.
16

Effects of four soil surfactants on four soil-water properties in sand and silt loam

Mobbs, Tamara Leah. January 2010 (has links) (PDF)
Thesis (M.S. in biological and agricultural engineering)--Washington State University, May 2010. / Title from PDF title page (viewed on June 23, 2010). "Department of Biological Systems Engineering." Includes bibliographical references (p. 16-22).
17

Microenvironmental nonideality effects in adsorption of surfactants and micellar solubilization

Pyter, Richard Allen. January 1980 (has links)
Thesis (Ph. D.)--University of Wisconsin--Madison, 1980. / Typescript. Vita. eContent provider-neutral record in process. Description based on print version record. Includes bibliographical references (leaves 260-267).
18

Interactions between surface active components in the promotion and destruction of foams /

Frye, Gregory Charles. January 1987 (has links)
Thesis (Ph. D.)--University of Washington, 1987. / Vita. Bibliography: leaves [221]-228.
19

Cationic oligomeric surfactants novel synthesis and characterization /

Topp, Kathryn A. January 2006 (has links)
Thesis (Ph. D.)--School of Chemistry, Faculty of Science, University of Sydney, 2006. / Title from title screen (viewed 13 January 2009). Submitted in fulfilment of the requirements for the degree of Doctor of Philosophy to the School of Chemistry, Faculty of Science. Includes bibliographical references. Also available in print form.
20

Synthesis of 1-Hydroxyethyl-2-dimethyl alkyl-ammonium surfactants and their properties in aqueous solution

Chen, Wen-Hwei 01 January 1975 (has links)
No description available.

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