Relevant bibliographies by topics / Oligomeric surfactants

Academic literature on the topic 'Oligomeric surfactants'

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Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "Oligomeric surfactants"

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Huang, Huiyu, Xiaoling Huang, Hongping Quan, and Xin Su. "Soybean-Oil-Based CO2-Switchable Surfactants with Multiple Heads." Molecules 26, no. 14 (July 18, 2021): 4342. http://dx.doi.org/10.3390/molecules26144342.

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Oligomeric surfactants display the novel properties of low surface activity, low critical micellar concentration and enhanced viscosity, but no CO2 switchable oligomeric surfactants have been developed so far. The introduction of CO2 can convert tertiary amine reversibly to quaternary ammonium salt, which causes switchable surface activity. In this study, epoxidized soybean oil was selected as a raw material to synthesize a CO2-responsive oligomeric surfactant. After addition and removal of CO2, the conductivity analyzing proves that the oligomeric surfactant had a good response to CO2 stimulation. The viscosity of the oligomeric surfactant solution increased obviously after sparging CO2, but returned to its initial low viscosity in the absence of CO2. This work is expected to open a new window for the study of bio-based CO2-stimulated oligomeric surfactants.
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Liu, Lulu, Shuai He, Lu Tang, Shu Yang, Tao Ma, and Xin Su. "Application of CO2-Switchable Oleic-Acid-Based Surfactant for Reducing Viscosity of Heavy Oil." Molecules 26, no. 20 (October 16, 2021): 6273. http://dx.doi.org/10.3390/molecules26206273.

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CO2-switchable oligomeric surfactants have good viscosity-reducing properties; however, the complex synthesis of surfactants limits their application. In this study, a CO2-switchable “pseudo”-tetrameric surfactant oleic acid (OA)/cyclic polyamine (cyclen) was prepared by simple mixing and subsequently used to reduce the viscosity of heavy oil. The surface activity of OA/cyclen was explored by a surface tensiometer and a potential for viscosity reduction was revealed. The CO2 switchability of OA/cyclen was investigated by alternately introducing CO2 and N2, and OA/cyclen was confirmed to exhibit a reversible CO2-switching performance. The emulsification and viscosity reduction analyses elucidated that a molar ratio of OA/cyclen of 4:1 formed the “pseudo”-tetrameric surfactants, and the emulsions of water and heavy oil with OA/cyclen have good stability and low viscosity and can be destabilized quickly by introducing CO2. The findings reported in this study reveal that it is feasible to prepare CO2-switchable pseudo-tetrameric surfactants with viscosity-reducing properties by simple mixing, thus providing a pathway for the emulsification and demulsification of heavy oil by using the CO2-switchable “pseudo”-oligomeric surfactants.
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Chou, S. I., and J. H. Bae. "Using Oligomeric Surfactants To Improve Oil Recovery." SPE Reservoir Engineering 4, no. 03 (August 1, 1989): 373–80. http://dx.doi.org/10.2118/16725-pa.

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Han, Yuchun, Yaxun Fan, Chunxian Wu, Yilin Wang, and Yanbo Hou. "Synthesis and aggregation behavior of oligomeric surfactants." SCIENTIA SINICA Chimica 45, no. 4 (March 1, 2015): 327–39. http://dx.doi.org/10.1360/n032014-00246.

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Laschewsky, André, Laurent Wattebled, Michel Arotçaréna, Jean-Louis Habib-Jiwan, and Rivo H. Rakotoaly. "Synthesis and Properties of Cationic Oligomeric Surfactants." Langmuir 21, no. 16 (August 2005): 7170–79. http://dx.doi.org/10.1021/la050952o.

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VORTMAN, M. YA, V. N. LEMESHKO, L. A. GONCHARENKO, S. M. KOBYLINSKIY, V. V. SHEVCHENKO, and S. N. OSTAPIUK. "OLIGOMERIC GUANIDINE-CONTAINING PROTON CATIONIC IONIC LIQUID." Polymer journal 43, no. 4 (November 26, 2021): 304–10. http://dx.doi.org/10.15407/polymerj.43.04.304.

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Oligomeric ionic liquids occupy an intermediate position between low molecular weight and polymeric. They are promising as polymer electrolytes in electrochemical devices for various purposes, membranes for the separation of gas mixtures, in sensor technologies, and so on. Oligomeric guanidinium ionic liquids are practically not described in the literature. In terms of studying the effect of the structure of the epoxy component on the properties of oligomeric ionic liquids of this type, it is advisable to introduce into its composition an aliphatic oligoether component. The choice of aliphatic oligoepoxide for the synthesis of guanidinium oligomeric ionic liquids is based on the fact that it is structurally similar to poly - and oligoethylene oxides, which are known to be non-toxic, biodegradable, and reactive oligomeric ionic liquids at elevated temperatures. A new type of reactive oligomeric proton cationic ionic liquid was synthesized by the reaction of oligomeric aliphatic diepoxide with guanidine, followed by neutralization of the product with hydrochloric acid. In this study, the synthesis of proton cationic oligomeric ionic liquids was based on the introduction of guanidinium fragments as end groups of the oligoether aliphatic chain. This reaction is attractive because of the ease of opening the oxirane ring with such a strong nucleophile as guanidine.The reaction forms a fragment with an aliphatic C-N bond, which retains the high basicity of the nitrogen atom. Its structure is characterized by the presence of guanidinium groups at the ends of the aliphatic hydroxyl-containing oligoether chain. The chemical structure of this compound is characterized by IR -, 1H ,13 C NMR spectroscopy methods, and its molecular mass characteristics are determined.The average molecular weight of the synthesized oligomeric ionic liquids is 610 g / mol.The value of the coefficient of polydispersity of the synthesized oligomeric ionic liquids is equal to 1.2. Determination of the content of amino groups in the guanidine-containing oligomer in the basic form by titrometric method allowed to establish that the value found is close to the theoretically calculated value. The synthesized oligomeric proton ionic liquid is characterized by an amorphous structure with two glass transition temperatures. The first lies in the range -70 °C, the second in the region of 70 °C, and the beginning of thermal oxidative destruction is located in the region of 148 °C. The temperature dependence of the ionic conductivity for this compound is nonlinear in the Arrhenius coordinates, which indicates the realization of ionic conductivity mainly due to the free volume in the system. The proton conductivity of this compound is 6.4·10-5–1·10-2Cm/cmin the range of 20–100 °C. The obtained compound exhibits surface-active properties characteristic of classical surfactants, as evidenced by the value of the limiting surface activity – 2.8·102 Nm2 / kmol. The value of CCM is 1.8·10-2 mol/l., and the value of the minimum surface tension – 37.70 mN / m. The synthesized oligomeric ionic liquid is of interest as electrolytes operating under anhydrous conditions, surfactants, disinfectants, and starting reagents for the synthesis of ion-containing blockopolymers.
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Zhu, Linyi, Yongqiang Tang, and Yilin Wang. "Constructing Surfactant Systems with the Characteristics of Gemini and Oligomeric Surfactants Through Noncovalent Interaction." Journal of Surfactants and Detergents 19, no. 2 (January 22, 2016): 237–47. http://dx.doi.org/10.1007/s11743-016-1790-2.

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Wang, Sheng Qin, Mohit Sharma, and Yew Wei Leong. "Polyamide 11/Clay Nanocomposite Using Polyhedral Oligomeric Silsesquioxane Surfactants." Advanced Materials Research 1110 (June 2015): 65–68. http://dx.doi.org/10.4028/www.scientific.net/amr.1110.65.

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This paper reports polyamide 11 (PA11)/layered silicate (clay) nanocomposite using polyhedral oligomeric silsesquioxane (POSS) surfactants. POSS functionalized with amino, ammonium and guanidinium groups were synthesized and used to facilitate the intercalation of polymer chains between silicate layers thereby to improve the dispersion of clay in polymer matrix. Nanocomposites from the blends of POSS-modified clay and PA11 were thus formulated via melting compounding and their mechanical and physical properties were characterized.
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Lazaridis, N., A. H. Alexopoulos, E. G. Chatzi, and C. Kiparissides. "Steric stabilization in emulsion polymerization using oligomeric nonionic surfactants." Chemical Engineering Science 54, no. 15-16 (July 1999): 3251–61. http://dx.doi.org/10.1016/s0009-2509(98)00336-4.

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Fan, Yaxun, and Yilin Wang. "Self-Assembly and Functions of Star-Shaped Oligomeric Surfactants." Langmuir 34, no. 38 (April 4, 2018): 11220–41. http://dx.doi.org/10.1021/acs.langmuir.8b00290.

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Dissertations / Theses on the topic "Oligomeric surfactants"

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Topp, Kathryn A. "Cationic oligomeric surfactants novel synthesis and characterization /." Connect to full text, 2006. http://hdl.handle.net/2123/1728.

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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.
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Topp, Kathryn Alexandra. "Cationic Oligomeric Surfactants: Novel Synthesis and Characterization." Thesis, The University of Sydney, 2006. http://hdl.handle.net/2123/1728.

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Oligomeric surfactants, sometimes referred to as gemini surfactants, consist of two or more amphiphilic ‘monomer’ units linked together by spacer groups. The chemical identity of the spacer group is unconstrained, and it joins the individual units at or near the hydrophilic headgroups. Oligomeric surfactants display a range of interesting properties, including very low critical micelle concentrations, high surface activity and unusual rheology and self-assembly. Consequently they have many potential applications, both scientific and industrial. Until now, their use has been limited by the cost of their synthesis, which in some cases involve long and difficult procedures. This project developed from the idea that a synthesis based on polymerization could prove a useful and versatile method for producing these surfactants. The chemical starting point for this project was a series of polymerizable surfactants (‘surfmers’), upon which polymerization was performed. Two families of surfmers were investigated, both cationic and based on methacrylate and vinylpyridinium moieties respectively. The physical behaviour of these surfactants – a number of which are new – was investigated using standard techniques; these included the determination of the critical micelle concentration, characterization of phase behaviour, neutron scattering and surface adsorption. In producing oligomers, the initial focus was on free-radical polymerization, with control of molecular weight to be achieved by chain-transfer techniques. Due largely to analysis problems, this work proved unsuccessful. In its place a new reaction, not based on conventional polymerization methods, has been developed. The vinylpyridinium surfmers mentioned above readily undergo addition across the double bond to produce alkyl ring substituents. Under basic conditions, these alkylpyridiniums undergo an elimination/addition reaction in which they link together to form oligomers. This reaction can be started or stopped by raising or lowering the pH of the reaction solution, and has been performed in both organic and aqueous solutions. It is referred to in this thesis as LELA(Linkage by ELimination/Addition). The LELA reaction was used to produce mixtures of oligomers, the phase behaviour and surface adsorption of which were examined. Small-angle neutron scattering was used to monitor the reaction in real time and identify changes in self-assembly as the average oligomer length increased. Progress was also made towards a chromatographic protocol that would allow mixtures to be separated into their components and the pure oligomers to be studied. Finally, some of the compounds studied display interesting pH-dependent chromophoric properties which were also found to occur with other simple alkylpyridinium species. They are tentatively ascribed to inter- and intramolecular charge-transfer complexes, and evidence towards this conclusion was collected and is presented along with relevant calculations.
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Topp, Kathryn Alexandra. "Cationic Oligomeric Surfactants: Novel Synthesis and Characterization." University of Sydney, 2006. http://hdl.handle.net/2123/1728.

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Doctor of Philosophy (PhD)
Oligomeric surfactants, sometimes referred to as gemini surfactants, consist of two or more amphiphilic ‘monomer’ units linked together by spacer groups. The chemical identity of the spacer group is unconstrained, and it joins the individual units at or near the hydrophilic headgroups. Oligomeric surfactants display a range of interesting properties, including very low critical micelle concentrations, high surface activity and unusual rheology and self-assembly. Consequently they have many potential applications, both scientific and industrial. Until now, their use has been limited by the cost of their synthesis, which in some cases involve long and difficult procedures. This project developed from the idea that a synthesis based on polymerization could prove a useful and versatile method for producing these surfactants. The chemical starting point for this project was a series of polymerizable surfactants (‘surfmers’), upon which polymerization was performed. Two families of surfmers were investigated, both cationic and based on methacrylate and vinylpyridinium moieties respectively. The physical behaviour of these surfactants – a number of which are new – was investigated using standard techniques; these included the determination of the critical micelle concentration, characterization of phase behaviour, neutron scattering and surface adsorption. In producing oligomers, the initial focus was on free-radical polymerization, with control of molecular weight to be achieved by chain-transfer techniques. Due largely to analysis problems, this work proved unsuccessful. In its place a new reaction, not based on conventional polymerization methods, has been developed. The vinylpyridinium surfmers mentioned above readily undergo addition across the double bond to produce alkyl ring substituents. Under basic conditions, these alkylpyridiniums undergo an elimination/addition reaction in which they link together to form oligomers. This reaction can be started or stopped by raising or lowering the pH of the reaction solution, and has been performed in both organic and aqueous solutions. It is referred to in this thesis as LELA(Linkage by ELimination/Addition). The LELA reaction was used to produce mixtures of oligomers, the phase behaviour and surface adsorption of which were examined. Small-angle neutron scattering was used to monitor the reaction in real time and identify changes in self-assembly as the average oligomer length increased. Progress was also made towards a chromatographic protocol that would allow mixtures to be separated into their components and the pure oligomers to be studied. Finally, some of the compounds studied display interesting pH-dependent chromophoric properties which were also found to occur with other simple alkylpyridinium species. They are tentatively ascribed to inter- and intramolecular charge-transfer complexes, and evidence towards this conclusion was collected and is presented along with relevant calculations.
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Holland, Kirsten Jane. "The adsorptive properties of oligomeric, non-ionic surfactants from aqueous solution." Thesis, Brunel University, 1998. http://bura.brunel.ac.uk/handle/2438/5372.

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Surfactants from the 'Triton' range, manufactured by Rohm and Haas, Germany, were used to study the adsorptive behaviour of non-ionic surfactants (of the alkyl polyoxyethylene type) from aqueous solution onto mineral oxide surfaces. The oligomeric distributions of the surfactants were characterised using the HPLC technique. Two gradients were used: a normal phase gradient was used to study the surfactants from non-aqueous solution; an unusual gradient, which could not be definitively categorised as either normal or reversed phase and which was developed at Brunel, was used to analyse surfactants directly from aqueous solution. Quartz was used as a model mineral oxide surface. The quartz surface was characterised using a range of techniques: scanning electron microscopy (SEM), X-ray photoelectron spectroscopy, X-ray fluorescence -analysis, Fourier transform-infra red spectroscopy and BET analysis. It was found that washing the quartz with concentrated HCI removed any calcium ions present on the surface and also removed 02- ions. Calcining the sample removed carbonaceous materials from the surface and also caused a decrease in the surface area. The quartz was shown to be non-porous by SEM and BET analysis. The adsorption experiments for this study were carried out using a simple tumbling method for which known ratios of surfactant in aqueous solution and quartz silica were mixed together for a known length of time. The amounts of surfactant present were measured using ultra-violet analysis and the HPLC techniques mentioned above. It was found that the smallest oligomers were adsorbed the most. An addition of salt to the system caused an overall increase in adsorption of the bulk surfactant, and increase in temperature caused an initial decrease in adsorbed amounts before the plateau of the isotherm and a final increase in bulk adsorption at the plateau of the isotherm. The oligomeric adsorption generally appeared to mirror the behaviour of the bulk surfactant. Atomic force microscopy (AFM), dynamic light and neutron scattering studies were used to analyse the character of the adsorbed surfactant layer. It was shown that the layer reached a finite thickness that corresponded to a bilayer of adsorbed surfactant. According to AFM data, this value of thickness was not consistent over the whole of the quartz surface.
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Wattebled, Laurent. "Oligomeric surfactants as novel type of amphiphiles : structure - property relationships and behaviour with additives." Phd thesis, Universität Potsdam, 2006. http://opus.kobv.de/ubp/volltexte/2007/1285/.

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The properties of a series of well-defined new surfactant oligomers (dimers to tetramers)were examined. From a molecular point of view, these oligomeric surfactants consist of simple monomeric cationic surfactant fragments coupled via the hydrophilic ammonium chloride head groups by spacer groups (different in nature and length). Properties of these cationic surfactant oligomers in aqueous solution such as solubility, micellization and surface activity, micellar size and aggregation number were discussed with respect to the two new molecular variables introduced, i.e. degree of oligomerization and spacer group, in order to establish structure – property relationships. Thus, increasing the degree of oligomerization results in a pronounced decrease of the critical micellization concentration (CMC). Both reduced spacer length and increased spacer hydrophobicity lead to a decrease of the CMC, but to a lesser extent. For these particular compounds, the formed micelles are relatively small and their aggregation number decreases with increasing the degree of oligomerization, increasing spacer length and sterical hindrance. In addition, pseudo-phase diagrams were established for the dimeric surfactants in more complex systems, namely inverse microemulsions, demonstrating again the important influence of the spacer group on the surfactant behaviour. Furthermore, the influence of additives on the property profile of the dimeric compounds was examined, in order to see if the solution properties can be improved while using less material. Strong synergistic effects were observed by adding special organic salts (e.g. sodium salicylate, sodium vinyl benzoate, etc.) to the surfactant dimers in stoichiometric amounts. For such mixtures, the critical aggregation concentration is strongly shifted to lower concentration, the effect being more pronounced for dimers than for analogous monomers. A sharp decrease of the surface tension can also be attained. Many of the organic anions produce viscoelastic solutions when added to the relatively short-chain dimers in aqueous solution, as evidenced by rheological measurements. This behaviour reflects the formation of entangled wormlike micelles due to strong interactions of the anions with the cationic surfactants, decreasing the curvature of the micellar aggregates. It is found that the associative behaviour is enhanced by dimerization. For a given counterion, the spacer group may also induce a stronger viscosifying effect depending on its length and hydrophobicity. Oppositely charged surfactants were combined with the cationic dimers, too. First, some mixtures with the conventional anionic surfactant SDS revealed vesicular aggregates in solution. Also, in view of these catanionic mixtures, a novel anionic dimeric surfactant based on EDTA was synthesized and studied. The synthesis route is relatively simple and the compound exhibits particularly appealing properties such as low CMC and σCMC values, good solubilization capacity of hydrophobic probes and high tolerance to hard water. Noteworthy, mixtures with particular cationic dimers gave rise to viscous solutions, reflecting the micelle growth.
Die Eigenschaften einer Reihe gut definierter neuer oligomerer Tenside (von Dimeren bis zu Tetrameren) wurden untersucht. Strukturell bestehen diese oligomeren Tenside aus einfachen monomeren kationischen Tensidfragmenten, die über die hydrophile Kopfgruppe (Tetraalkyl-Ammoniumchlorid) durch „Spacer“-Gruppen unterschiedlicher Natur und Länge miteinander verbunden/gekoppelt sind. Die Eigenschaften dieser kationischen oligomeren Tenside in wässriger Lösung wie Löslichkeit, kritische Mizellbildungskonzentration und Oberflächenaktivität, Mizellgröße und Aggregationszahl werden in Bezug auf die zwei neuen molekularen Variabeln (d.h. dem Oligomerisationsgrad und der Spacer-Gruppe) untersucht, um Struktur-Eigenschafts-Beziehungen abzuleiten. Die Erhöhung des Oligomerizationsgrads verringert stark die kritische Mizellbildungskonzentration (CMC). Eine kurze Spacer-Länge oder ein erhöhte Hydrophobie des Spacers erniedrigt die CMC ebenfalls, aber in einem geringeren Umfang. Die gebildeten Mizellen sind relativ klein und ihre Aggregationszahl nimmt mit zunehmendem Oligomerisationsgrad ab, genau wie mit zunehmender Spacerlänge oder sterischer Behinderung. Außerdem wurden Pseudo-Phasendiagramme für die Gemini-Tenside in komplexen Systemen, nämlich in inversen Mikroemulsionen untersucht. Auch hier zeigt die Spacer-Gruppe einen großen Einfluß auf das Tensidverhalten. Weiterhin wurde der Einfluss von Zusätzen auf das Eigenschaftsprofil der dimeren Tenside untersucht. Starke Synergien wurden beobachtet, wenn man spezielle organische Anionen (z.B. Natriumsalicylat, Natriumvinylbenzoat, etc.) zu den dimeren Tensiden in stöchiometrischen Mengen hinzugibt. Für solche Mischungen wird die Mizellbildungskonzentration stark zu niedrigen Konzentrationen verschoben, wobei der Effekt für die Dimere ausgeprägter als für die analogen Monomere ist. Eine Verringerung der Oberflächenspannung wird ebenfalls erreicht. Gemini-Tenside mit geeigneten Spacer-Gruppen bilden nach Zugabe ausgewählter organischer Anionen viskoelastische Lösungen, selbst wenn die dimeren Tenside nur über relativ kurz Alkylketten verfügen. Dies wurde mittels rheologischer Messungen gezeigt. Dieses Verhalten resultiert aus der Bildung langer Zylinder-Mizellen aufgrund der starken Wechselwirkung der Anionen mit den kationischen Tensiden, die die Krümmung der mizellaren Strukturen verringern. Es wurde auch festgestellt, dass das assoziative Verhalten durch die Dimerisation erhöht wird. Für ein gegebenes Gegenion kann die Spacer-Gruppe den verdickenden Effekt verstärken, in Abhängichkeit von seiner Länge und Hydrophobie. Als weitere Zusätze wurden entgegengesetzt geladene Tenside wurden mit den kationischen Dimeren kombiniert. Einige Mischungen mit dem käuflichen anionischen Tensid SDS bilden Vesikel in Lösung. Mit Blick auf diese katanionischen Mischungen wurde ein neues anionisches Gemini-Tensid, das auf EDTA basiert ist, synthetisiert und charakterisiert. Der Syntheseweg ist relativ einfach und das Tensid zeigt interessante Eigenschaften wie niedrige CMC- und scmc-Werte, gute Solubilisierungskapazität von hydrophoben Substanzen und hohe Toleranz gegen hartes Wasser. Mischungen dieses anionischen Tensids mit bestimmten kationischen Dimeren bilden visköse Lösungen, was ein starkes Mizell-Wachstum widerspiegelt.
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Wattebled, Laurent. "Oligomeric surfactants as novel type of amphiphiles structure - property relationships and behaviour with additives /." [S.l.] : [s.n.], 2007. http://opus.kobv.de/ubp/volltexte/2007/1285.

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Huang, Jiahao. "Synthesis And Phase Behavior Of Giant Surfactants With Polystyrene (PS) Tethered Four Polyhedral Oligomeric Silsesquioxane (POSS) Heads." University of Akron / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=akron1460328265.

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Su, Hao. "Macromolecular Structure Evolution of Giant Molecules Via "Click" Chemistry: Asymmetric Giant Gemini Surfactants Based on Polyhedral Oligomeric Silsesquioxane." University of Akron / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=akron1398727473.

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Mu, Gaoyan. "Synthesis and Self-assembly of Star-shape Giant Molecules Based on Hydrophilic Polyhedral Oligomeric Silsesquioxane (POSS)." University of Akron / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=akron1491142552670233.

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Huang, Mingjun. "Design, Synthesis, and Self-Assembly of Well-Defined Hybrid Materials Including Polymer Amphiphiles and Giant Tetrahedra Molecules Based on POSS Nanoparticles." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1447346473.

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Book chapters on the topic "Oligomeric surfactants"

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Thetford, D. "Applications of oligomeric surfactants in polymer systems." In Surfactants in Polymers, Coatings, Inks and Adhesives, 120–51. Blackwell, 2020. http://dx.doi.org/10.1201/9780367812416-5.

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Jurašin, Darija, and Maja Dutour Sikirić. "Higher Oligomeric Surfactants — From Fundamentals to Applications." In Oligomerization of Chemical and Biological Compounds. InTech, 2014. http://dx.doi.org/10.5772/57655.

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Zhang, Jie, Xu-Yang Yao, Bao-Jun Bai, and Wang Ren. "Performance Evaluation and Mechanism Study of a Silicone Hydrophobic Polymer for Improving Gas Reservoir Permeability." In 21st Century Surface Science - a Handbook. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.90811.

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The permeability of tight gas reservoirs is usually lower than 1 md. When the external fluids from drilling and completion processes invade such reservoirs, formation damage occurs and causes serious damage to oil and gas production. Fluorocarbon surfactants are most often recommended for removing such damage because they have extremely low surface tension, which means that they can change the reservoir wettability from water wet to gas or oil wet. However, they are not normally applied in the field because they are not cost-effective. Besides, some environmental concerns also restrict their application. In this work, we studied the effects of an oligomeric organosilicon surfactant (OSSF) on wettability modification, surface tension reduction, invasion of different fluids, and fluid flow back. It was found that the amount of spontaneous imbibition and remaining water could be reduced by the surfactant as a result of surface tension reduction and wettability alteration. Compared to the distilled water, the concentration of 0.20 wt% OSSF could decrease water saturation of cores by about 4%. At a flow-back pressure of 0.06 and 0.03 MPa after 20 PV displacement, permeability recovery could increase from 8 to 7–93% and 86%, respectively. We also found that the mechanism of OSSF includes the physical obstruction effect, surface tension reduction of external fluids, and wettability alteration of the reservoir generated. Meanwhile, quantum chemical calculations indicated that adsorbent layer of polydimethylsiloxane could decrease the affinity and adhesion of CH4 and H2O on the pore surface.
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In, Martin. "Gemini Surfactants and Surfactant Oligomers." In Surfactant Science. CRC Press, 2001. http://dx.doi.org/10.1201/9780203908662.ch3.

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Eden, Don, Kerwin Ng, Sergio Aragon, and Martin Perez. "Optical Kerr Effect of DNA Oligomers and tRNA." In Surfactant Science. CRC Press, 2006. http://dx.doi.org/10.1201/9781420009859.ch10.

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Conference papers on the topic "Oligomeric surfactants"

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Jie, Zhang, Xianguang Xu, Lihui Wang, long Li, Die Zhang, Zhiliang Zhao, and Shuangwei Wang. "Experimental Study on the Synthesis and Interfacial Properties of Oligomeric Silicone Surfactant." In SPE International Conference on Oilfield Chemistry. Society of Petroleum Engineers, 2019. http://dx.doi.org/10.2118/193625-ms.

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Arroyo, Raquel, Mercedes Echaide, Emma Batllori, Alberto Galindo, Fernando Moreno-Herrero, Jesús Pérez-Gil, and Paul S. Kingma. "Characterization of the activity of the different oligomeric forms of pulmonary human surfactant protein SP-D." In ERS International Congress 2019 abstracts. European Respiratory Society, 2019. http://dx.doi.org/10.1183/13993003.congress-2019.pa2382.

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Rajput, H. "Exploiting Reducing Ability of DMF For Assembled Gold Nanostructures." In Functional Materials and Applied Physics. Materials Research Forum LLC, 2022. http://dx.doi.org/10.21741/9781644901878-14.

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Abstract. We explore stable assembly of gold NPs in single step process by introducing a simple chemical synthesis in which pH changed gold precursor is added to dimethylformamide solution at RT. The redox chemistry of N, N-dimethylformamide (DMF) has been effectively utilized in the formation of surfactant free, small chain metal NPs networks (plasmonic oligomers) via molecular dipolar coupling. Kinetic absorption / TEM images illustrate gold nanocrystals formation, their inter-particle coupling as a function of pH as well as with DMF-Water ratio. Sub-nano gap inter-particle coupling b/w spherical/anisotropic Au NPs is seen through arising of new LSPR hump in NIR region. 1-D organized gold nanocrystals are formed when pH modified metal precursor is added to refluxed (80 0C) DMF: Water mixture. The inter-particle coupling provides unique strategy can promote complex sub-wavelength optical waveguides and nanophotonic devices.
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Reports on the topic "Oligomeric surfactants"

1

Viers, Brent D., Alan Esker, and Katie Farmer. Polyhedral Oligomeric Silsesquioxanes Surfactants. Fort Belvoir, VA: Defense Technical Information Center, January 2001. http://dx.doi.org/10.21236/ada410399.

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