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Dissertations / Theses on the topic 'Surfactants'

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Published: 4 June 2021
Last updated: 25 July 2025

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1

Hines, J. D. "Investigation of surfactants and surfactant mixtures." Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.337736.

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2

Stellner, Kevin Lance. "Precipitation of surfactants and surfactant mixtures in aqueous solutions /." Full-text version available from OU Domain via ProQuest Digital Dissertations, 1987.

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3

Kjellin, Mikael. "Structure-Property Relationships of Surfactants at Interfaces and Polyelectrolyte-Surfactant Aggregates." Doctoral thesis, KTH, Chemistry, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3299.

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<p>The first part of this thesis is concerned with thestructure-property relationships in nonionic surfactantsystems. The main aim was to investigate how the surfactantstructure influences the adsorption at interfaces andinteractions between surfactant coated interfaces.Particularly, the effect of the structure of the surfactantheadgroups was investigated. These were sugar-based headgroupwith varying size and flexibility and poly(ethylene oxide)based headgroups with or without an additional amide or estergroup. The hydrophobic part of the surfactant consisted mostlyof straight alkyl chains, ex
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4

Nusselder, Jan Jacob Hendrik. "Surfactant structure and aggregation behavior 1-alkyl-4-alkylpyridinium iodide surfactants /." [S.l. : [Groningen : s.n.] ; University Library Groningen] [Host], 1990. http://irs.ub.rug.nl/ppn/29074184X.

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5

Bleta, Rudina. "Systèmes fluorés pour la conception de matériaux poreux : Matrices pour la physisorption de biomolécules." Thesis, Nancy 1, 2007. http://www.theses.fr/2007NAN10111/document.

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Les propriétés d’auto organisation de tensioactifs ainsi que celles de la chimie de la silice ont permis de préparer des matériaux mésoporeux organisés selon une symétrie hexagonale, cubique ou lamellaire dont la taille des pores varie de 2 à plus de 10 nm. Ils sont depuis quelques années le centre d’intérêt d’universitaires et d’industriels qui développent des recherches fondamentales et appliquées. La compréhension globale des mécanismes de synthèse et la maîtrise des propriétés structurales et texturales des matériaux mésoporeux sont nécessaires pour envisager leur utilisation dans un quelc
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6

Sherratt, A. E. "Polymeric surfactants." Thesis, Lancaster University, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282410.

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7

Neimert-Andersson, Kristina. "Synthesis of Novel Polyhydroxyl Surfactants. Influence of the Relative Stereochemistry on Surfactant Properties." Licentiate thesis, KTH, Chemistry, 2003. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-1687.

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<p>This thesis deals with the synthesis and characterization ofnovel polyhydroxyl surfactants. The first part describes thesynthesis of a number of stereoisomers of a polyhydroxylsurfactant, and the second part concerns surface chemicalcharacterization.</p><p>A stereodivergent route for preparation of the hydrophilichead group was developed, featuring consecutive stereoselectivedihydroxylations of a diene. This afforded in total fourdifferent polyhydroxyl head groups. These surfactant headgroups were natural and unnatural sugar analogues, and wereused for the coupling with two different hydrop
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ALENCAR, Bruna Cabral de. "Influência da dinâmica de sorção/dessorção na biodegradação anaeróbia do alquilbezeno linear sulfonado." Universidade Federal de Pernambuco, 2015. https://repositorio.ufpe.br/handle/123456789/17246.

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Submitted by Haroudo Xavier Filho (haroudo.xavierfo@ufpe.br) on 2016-07-01T14:17:21Z No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação Versão em PDF.pdf: 1393964 bytes, checksum: 9f6914af2635718fc925ce4690531587 (MD5)<br>Made available in DSpace on 2016-07-01T14:17:21Z (GMT). No. of bitstreams: 2 license_rdf: 1232 bytes, checksum: 66e71c371cc565284e70f40736c94386 (MD5) Dissertação Versão em PDF.pdf: 1393964 bytes, checksum: 9f6914af2635718fc925ce4690531587 (MD5) Previous issue date: 2015-01-30<br>CAPES<br>O LAS é um tensoativo usado na
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9

Brown, Paul. "Magneto-responsive surfactants." Thesis, University of Bristol, 2012. http://hdl.handle.net/1983/41cd19c9-3d4d-47c9-a6a6-dfcab12586f2.

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Surfactants comprise one of the largest volume commodity chemicals in the world and have multifarious uses from pharmaceuticals, agrochemicals, food, fuel and lubricant additives, paints and inks as well as detergents and cleaning agents. The ability to control surfactants once they are in solution is of great importance not only for scientific reasons but also because of environmental and economic interest. To this end, surfactants sensitive to changes in pH, temperature, C02, light and redox have already been developed. This thesis investigates a new class of surfactants designed to be magne
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10

Neimert-Andersson, Kristina. "Synthesis of Polyhydroxylated Surfactants : Comparison of Surfactant Stereoisomers and Investigation of Haemolytic Activity." Doctoral thesis, Stockholm, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-461.

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11

Goldsipe, Arthur Clayton. "Molecular-thermodynamic theories of micellization of multicomponent surfactant mixtures and of pH-sensitive surfactants." Thesis, Massachusetts Institute of Technology, 2006. http://hdl.handle.net/1721.1/34277.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, 2006.<br>This electronic version was submitted by the student author. The certified thesis is available in the Institute Archives and Special Collections.<br>Includes bibliographical references (p. 249-264).<br>This thesis focuses on two research areas that are particularly relevant to the practical application of surfactant science: (1) the micellization of multicomponent surfactant mixtures, and (2) the micellization of pH-sensitive (or amphoteric) surfactants. Surfactant formulations of practical utility
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12

Hollamby, Martin James. "Surfactants in unconventional solvents." Thesis, University of Bristol, 2009. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.503873.

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For any solvent to find global application in the chemical industry, methods by which its physical-chemical properties might be manipulated (with respect to e.g. polarity, surface tension, wettability and viscosity) are often required. One way to achieve this Is through the use of surfactants. To this end, surfactant behavior in a variety of unconventional solvent systems (polar hydrocarbons, fluorocarbons and liquid CO2) has been investigated with respect to aggregation, microemulsion formation and nanoparticle stabilization. Both commercial and custom-designed, in-house synthesized surfactan
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13

Mohamed, Azmi. "Optimising surfactants for CO2." Thesis, University of Bristol, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.556719.

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With regard to CO2-based processing and handling technologies, research into optimising COrphilic surfactant design is especially important. Here, surfactant structure design is focused on anionic surfactant analogues of Aerosol-OT (sodium bis (2-ethylhexyl) sulfosuccinate). The surfactants were systematically synthesised with modification centred on four strategies including (1) alkyl chain type (2) introduction of a third chain (3) counterion type and (4) surfactant template. The work presented in this thesis has aimed to investigate the relationship between the architecture and the properti
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14

Sukhapan, Jariya. "Surfactants in atmospheric aerosols." Thesis, University of East Anglia, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.251504.

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15

Laouar, Leila. "Microbial responses to surfactants." Thesis, University of Nottingham, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.336088.

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16

Paakkonen, Johan. "Surfactants in anionic latex films." Thesis, Karlstads Universitet, Avdelningen för kemi och biomedicinsk vetenskap, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-6389.

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17

Persson, Marcus. "Surfactants at non-polar surfaces." Doctoral thesis, KTH, Chemistry, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3444.

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<p>The aim of this thesis work was to investigate theadsorption of surfactants to different nonpolar interfaces.Particularly, the effects of the polar group and the nature ofthe hydrophobic interface were elucidated. The interfacialbehavior of the liquid-vapor interface was investigated bymeans of surface tension measurements. Here the effect of thepolar group and the hydrocarbon chain length was investigatedin a systematic manner. It was found that the shorter of thetwo chains examined, decyl, generated a larger surface pressurecontribution than the longer, dodecyl. Furthermore, the sugarbase
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18

Matsson, Maria. "Adsorption of polyhydroxyl based surfactants." Doctoral thesis, KTH, Chemistry, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-421.

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<p>Adsorption on solid surfaces from solution is a fundamental property of a surfactant. It might even be the most important aspect of surfactant behavior, since it influences many applications, such as cleaning, detergency, dispersion, separation, flotation, and lubrication. Consequently, fundamental investigations of surfactant adsorption are relevant to many areas.</p><p>The main aim of this thesis has been to elucidate the adsorption properties, primarily on the solid/water interface, of a particular class of polyhydroxyl based surfactants: the alkyl glucosides. By the use of ellipsometry,
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19

Uppgård, Lise-Lott. "Nonionic surfactants : A multivariate study." Doctoral thesis, Umeå universitet, Kemi, 2002. http://urn.kb.se/resolve?urn=urn:nbn:se:umu:diva-12.

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In this thesis technical nonionic surfactants are studied using multivariate techniques. The surfactants studied were alkyl ethoxylates (AEOs) and alkyl polyglucosides (APGs). The aquatic toxicity of the surfactants towards two organisms, a shrimp and a rotifer, was examined. The specified effect was lethality, LC50, as indicated by immobilisation. In a comparative study, the LC50 values obtained were used to develop two different types of model. In the log P model the toxicity was correlated to log P alone, while in the multivariate model several physicochemical variables, including log P, we
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20

Pilc, J. "Surfactants and enhanced oil recovery." Thesis, Brunel University, 1988. http://bura.brunel.ac.uk/handle/2438/5458.

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A large number of commercial and some novel Brunel synthesised surfactants have been studied with a view to their potential usefulness for enhanced oil recovery (EOR) application. Ethoxylated phenols and their sulphonated derivatives were given especially high priority. The surfactants were well-characterised in order to understand their EOR potential. High pressure liquid chromatography, mass spectrometry, Raman spectrometry, nuclear magnetic resonance spectrometry and other quantitative techniques were used. Aspects of their behaviour (as single components and as blends with co-surfactants a
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21

Burgoyne, John. "The mesophase structure of surfactants." Thesis, University of Central Lancashire, 1994. http://clok.uclan.ac.uk/20171/.

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The binary surfactant system nona (ethylene glycol) mono-( 11 -oxa- 14,18.22,26-tetramethylheptacosylether) in heavy water has been investigated using deuterium nuclear magnetic resonance, optical polarising microscopy and small angle scattering techniques. The phase diagram has been established and the phases encountered exist for the most part from 24 to 60% surfactant by weight. Above and below these concentrations exist isotropic and lamellar phases respectively. The phase diagram features three main phases, a hexagonal phase of circular rods, a lamellar phase and an intermediate phase. Th
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22

Matsson, Maria K. "Adsorption of polyhydroxyl based surfactants /." Stockholm : Chemical Science and Engineering, KTH, 2005. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-421.

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23

Shin, Youn-Ok 1971. "Extraction of lysozyme using surfactants." Thesis, McGill University, 2002. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=38519.

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The liquid-liquid extraction of biomolecules using a reverse micellar system has been studied in literature as a simple and easily scalable purification method that can be used in fermentation industry. The recovery of proteins from the reverse micellar phase has shown a low efficiency (less than 20%) making the technique unfavorable in industrial practice. In addition, the modeling is often complicated due to the complex interactions among surfactants, cosurfactants, electrolytes and charged biomolecules. Thus, this work was aimed to examine the solubilization behavior of lysozyme into four d
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24

Dimitrova, Galya Tzvetanova. "Phase behaviour of nonionic surfactants." Thesis, Imperial College London, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.244794.

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25

MacNab, Jamie Robert. "Interaction of oils with surfactants." Thesis, University of Hull, 1996. http://hydra.hull.ac.uk/resources/hull:4703.

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This thesis is concerned with the interactions of oils with surfactants. The understanding of these interactions is important for a number of practical applications which include perfume delivery in fabric softeners. Both non-ionic surfactants, of the general formula H( CH2)n( OCH2CH2)m-OH, and lome surfactants, of the general formula CnH2n+lW(CH3)3Br were used in the study. Oils of varying polarity were investigated from non-polar alkane oils to moderately polar perfume oils.Initially, the work of adhesions of the perfume oils with water were studied to establish where these oils 'fitted-in'
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26

Williams, K. H. "Dynamic wetting with superspreading surfactants." Thesis, University of Liverpool, 2018. http://livrepository.liverpool.ac.uk/3022625/.

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27

Czajka, Adam. "Surfactants at the design limit." Thesis, University of Bristol, 2018. http://hdl.handle.net/1983/93749e66-820d-41c8-a5c4-ffe743ce30d5.

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The adsorption and aggregation properties of twenty seven anionic hydrocarbon surfactants have been studied in aqueous systems. They are single-chain sulfonates with sodium or TAA counterions (where TAA = tetraalkylammonium, i.e. tetrapropylammonium), and di-chain sulfosuccinates with sodium counterions. The novel surfactants introduced possess branched tail structures which differ by the extent and position of branching. All surfactants were synthesised and purified to investigate the relationships between surfactant structure and performance. The aim of this project is to fundamentally impro
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28

Mass, John Thomas. "Dynamic properties of seawater surfactants." Thesis, Massachusetts Institute of Technology, 1996. http://hdl.handle.net/1721.1/38179.

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29

Tickle, David Christopher. "Enzyme models and chiral surfactants." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624682.

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30

Reetz, Ivo, and A. Kilikli. "Extended Surfactants for Leather - 218." Verein für Gerberei-Chemie und -Technik e. V, 2019. https://slub.qucosa.de/id/qucosa%3A34192.

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Content: Surfactants of different ionic nature are used in virtually all steps of leather production. In processes like soaking, degreasing and wool washing, tremendous amounts of surfactants are applied and to a great extent discharged into the tannery effluent. In order to improve the sustainability of leather processing, there is a constant search for more efficient, environmentally friendly emulsifiers, which give superior results already in smaller usage amounts. By introduction of propylene oxide based lipophilic linkers between the hydrophilic head and hydrophobic tail, the wetting and
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31

Cachile, Mario Andres. "Etalement de solutions de surfactants." Paris 6, 2000. http://www.theses.fr/2000PA066556.

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Nous presentons l'etude experimentale de l'etalement spontanee de gouttes de solutions de tensioactifs sur des substrats solides. Nous utilisons des tensioactifs non-ioniques du type c 1 2e n et le superspreader. Les premiers, dans ethylene et diethylene glycol, s'etalent sur des disques de silicium et le superspreader, en solutions aqueuses, sur des boites de petri hydrophyles. Les parametres d'etude sont d'une part la concentration du tensioactif dans les solutions et d'autre part l'humidite relative ambiante. Nous trouvons que, pour toutes les concentrations et a faible humidite ( 30%), les
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32

Carolei, Luciano. "Determinação de surfactantes e água em formulações de sabonetes líquidos e shampoos por infravermelho por transformada de Fourier (FTIR) utilizando a técnica de reflectância total atenuada (ATR)." Universidade de São Paulo, 2005. http://www.teses.usp.br/teses/disponiveis/46/46133/tde-29102007-143925/.

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Demonstrou-se pela primeira vez que é possível determinar surfactantes e água em formulações de Sabonetes Líquidos (SL) e Shampoos (SH), direta e simultaneamente pela técnica de infravermelho por transformada de Fourier (FTIR) acoplada à uma cela de reflectância total atenuada (ATR). Tradicionalmente, a principal aplicação do infravermelho médio (2,50 - 15,0 &#181;m) é a identificação de compostos orgânicos. O desenvolvimento de novos acessórios, principalmente de ATR, os avanços na área de microinformática e de métodos quimiométricos, vem viabilizando as análises quantitativas rápidas com exc
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33

Nilsson, Kristina. "Solute exchange across the alveolo-capillary barrier." Lund : Depts. of Clinical Physiology, Malmö University Hospital and Lund University Hospital, Lund University, 1997. http://books.google.com/books?id=A0hrAAAAMAAJ.

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34

Behrens, Eivind Joo. "Investigation of loss of surfactants during enhanced oil recovery applications - adsorption of surfactants onto clay materials." Thesis, Norges teknisk-naturvitenskapelige universitet, Institutt for kjemi, 2013. http://urn.kb.se/resolve?urn=urn:nbn:no:ntnu:diva-22423.

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Chemical flooding, or surfactant flooding, is a well known EOR technique which has been used worldwide for decades. For this method to be economically feasible, it is crucial to minimize the loss of surfactant to the reservoir. Currently the industry is considering combining chemical flooding with the newer technique of low salinity waterflooding which also has proved to be an efficient method for increasing oil recovery from reservoirs. In this study the adsorption of the anionic surfactant Aerosol OT onto kaolinite has been investigated by the indirect method of measuring surface tension.The
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35

Picone, Carolina Siqueira Franco 1983. "Formação de nanopartículas por associação de biopolímeros e surfactantes = Formation of nanoparticles by biopolymer - surfactant association." [s.n.], 2012. http://repositorio.unicamp.br/jspui/handle/REPOSIP/254194.

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Orientador: Rosiane Lopes da Cunha<br>Texto em português e inglês<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia de Alimentos<br>Made available in DSpace on 2018-08-20T12:57:32Z (GMT). No. of bitstreams: 1 Picone_CarolinaSiqueiraFranco_D.pdf: 4074904 bytes, checksum: 1a2779daa118fabb35ba241a8f6bf16f (MD5) Previous issue date: 2012<br>Resumo: As nano partículas possuem grande potencial para a liberação controlada de bioativos, porém ainda são pouco exploradas na área de alimentos. Neste trabalho foi estudada a formação de nanopartículas a partir da autoagrega
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36

Laschewsky, André. "Oligoethyleneoxide spacer groups in polymerizable surfactants." Universität Potsdam, 1991. http://opus.kobv.de/ubp/volltexte/2008/1722/.

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Cationic and zwitterionic polymerizable surfactants bearing tri- and tetraethyleneglycol spacer groups between the polymerizable moiety and the surfactant structure were prepared and polymerized. Monomers and polymers were investigated with respect to their aggregation behavior in aqueous systems and compared to analogous monomers and polymers lacking spacer groups. In the case of the monomeric surfactants, the spacer groups depress both the Kraffttemperature and the critical micelle concentration. the area occupied per molecule at the air-water interface is substantially enlarged by the space
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37

Kwan, Wai Chi. "Physical property determination of perfluorinated surfactants." Thesis, National Library of Canada = Bibliothèque nationale du Canada, 2001. http://www.collectionscanada.ca/obj/s4/f2/dsk3/ftp05/MQ62941.pdf.

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38

Folmer, Britta M. "Physico-chemical characterisation of novel surfactants /." Stockholm : Tekniska högsk, 2001. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-3052.

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Fraser, Douglas. "A fluorescence study of nonionic surfactants." Thesis, Lancaster University, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.254200.

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Briggs, C. B. A. "Synthesis and properties of new surfactants." Thesis, Imperial College London, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.379435.

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41

Taylor, Pietro. "Self-recognising surfaces using DNA-surfactants." Thesis, University of Hull, 2005. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.445731.

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Hudson, Laura Kate. "Structure versus Performance Surfactants at Interfaces." Thesis, University of Bristol, 2008. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.520667.

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Smith, Paul Andrew. "Simulation studies of alkanes and surfactants." Thesis, Queen's University Belfast, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.314225.

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Morley, Wayne Gerald. "The phase behaviour of food surfactants." Thesis, University of Salford, 1995. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308204.

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Warne, Barnaby. "Nanoparticles prepared from reactive metal surfactants." Thesis, University of Bristol, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.311430.

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Fernandez, Ana Vesperinas. "Properties and applications of photodestructible surfactants." Thesis, University of Bristol, 2007. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.442190.

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Campana, Mario. "Structural studies of surfactants at interfaces." Thesis, Queen Mary, University of London, 2012. http://qmro.qmul.ac.uk/xmlui/handle/123456789/8786.

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This thesis consists of a collection of studies on surfactant adsorption at different interfaces. Particularly, this dissertation focuses on adsorption processes occurring at buried interfaces (solid-liquid and liquid-liquid). Because of complexity in the sample environment, the study of buried interfaces is experimentally challenging. Neutron reflectivity enables the study of adsorption processes at interfaces at atomic length scale. Furthermore, neutrons can be transmitted through solid substrates, permitting the analysis of buried interfaces. The technique was used to describe adsorption pr
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48

Shang, Tiangang 1969. "A new class of photoresponsive surfactants." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/28845.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Chemical Engineering, February 2005.<br>Includes bibliographical references.<br>In this thesis, a new class of nonionic, photoresponsive surfactants consisting of a polar di(ethylene oxide) head group attached to an alkyl spacer of between two and eight methylene groups, coupled through an ether linkage to an azobenzene moiety, were synthesized and developed. Structural changes associated with the interconversion of the azobenzene group between its cis and trans forms as mediated by the wavelength of an irradiating light source,
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McGregor, Caroline. "Novel gemini surfactants for drug delivery." Thesis, University of Cambridge, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.621404.

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50

Goebel, Lisa Karen. "Electrokinetic separations involving surfactants and proteins." Diss., Virginia Tech, 1992. http://hdl.handle.net/10919/39443.

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Methods for the analysis of surfactants and proteins by Capillary Electrophoresis (CE) were investigated. Several modifications of the system to achieve detection and separation of these analytes were examined. These modifications included buffer additives, sample additives and surface treatment and modification of the fused silica capillary. For the analysis of anionic surfactants, the addition of an anionic IN absorbing compound to the buffer was investigated to achieve indirect detection of the non-absorbing surfactants. The effect on detection sensitivity and separation efficiency of the
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