Relevant bibliographies by topics / Non ionic gemini surfactants

Academic literature on the topic 'Non ionic gemini surfactants'

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Published: 4 June 2021
Last updated: 20 February 2023

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Journal articles on the topic "Non ionic gemini surfactants"

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Singh, Nirmal, and Lalit Sharma. "Synthesis of Carbohydrate Derived Non-ionic Gemini Surfactants and Study of Their Micellar and Reverse Micellar Behavior - A Review." Letters in Organic Chemistry 16, no. 8 (June 18, 2019): 607–14. http://dx.doi.org/10.2174/1570178616666190123124727.

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Gemini surfactants (gemini) are a distinct class of amphiphiles having more than one hydrophobic tail and hydrophilic head group connected via a spacer. These surfactants usually have better surface active properties than corresponding conventional surfactant of equal chain length. Depending upon the nature of charge on head group, these geminis may be cationic or anionic. If there is no charge on head group, the geminis are termed as non-ionic. Carbohydrate derived gemini surfactants carry sugar moiety linked with each of the conventional surfactants, which are further connected by spacer. The sugar moiety was found to enhance the aggregation tendencies. Moreover, due to the presence of sugar moiety, these surfactants are non-toxic and biodegradable. Due to chiral nature of sugar moiety, these surfactants can be used for chiral recognition of some chiral drugs in order to improve their aqueous solubility. Non-ionic surfactants are more important than ionic surfactants as in the latter case, due to repulsion among the same charged head group, aggregation does not take place readily. However, in case of non-ionic surfactants, the head group carries no charge, so there is no repulsion, thus micelle forms easily and at low concentration. The only repulsive forces among head groups are due to hydration shell formed by solvent molecules.
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Wang, Ruiguo, Xinxin Xu, Xiaodi Shi, Junjie Kou, Hongjian Song, Yuxiu Liu, Jingjing Zhang, and Qingmin Wang. "Promoting Efficacy and Environmental Safety of Pesticide Synergists via Non-Ionic Gemini Surfactants with Short Fluorocarbon Chains." Molecules 27, no. 19 (October 10, 2022): 6753. http://dx.doi.org/10.3390/molecules27196753.

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Improving the utilization rate of pesticides is key to achieve a reduction and synergism, and adding appropriate surfactant to pesticide preparation is an effective way to improve pesticide utilization. Fluorinated surfactants have excellent surface activity, thermal and chemical stability, but long-chain linear perfluoroalkyl derivatives are highly toxic, obvious persistence and high bioaccumulation in the environment. Therefore, new strategies for designing fluorinated surfactants which combine excellent surface activity and environmental safety would be useful. In this study, four non-ionic gemini surfactants with short fluorocarbon chains were synthesized. The surface activities of the resulting surfactants were assessed on the basis of equilibrium surface tension, dynamic surface tension, and contact angle. Compared with their monomeric counterparts, the gemini surfactants had markedly lower critical micelle concentrations and higher diffusivities, as well as better wetting abilities. We selected a single-chain surfactant and a gemini surfactant with good surface activities as synergists for the glyphosate water agent. Both surfactants clearly improved the efficacy of the herbicide, but the gemini surfactant had a significantly greater effect than the single-chain surfactant. An acute toxicity test indicated that the gemini surfactant showed slight toxicity to rats.
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Tang, Shan Fa, Xiao Dong Hu, Xiang Nan Ouyang, Shuang Xi Yan, Shou Cheng Wen, and Yan Ling Lai. "Experimental Study of Anionic Gemini Surfactant Enhancing Waterflooding Recovery Ratio." Advanced Materials Research 361-363 (October 2011): 469–72. http://dx.doi.org/10.4028/www.scientific.net/amr.361-363.469.

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The oil-water interfacial tension measurement and enhancing water displacement recovery experiment were carried out, and the effects of various parameters such as category of surfactants, anionic Gemini surfactant concentration, water medium salinity, core permeability, polymer and non-ionic surfactant on anionic Gemini surfactants enhancing water displacement recovery were investigated in detail. The results show that surfactants category is different, its enhancing water flooding recovery efficiency is different, and effect of enhanced oil recovery is consistent with surfactant ability to reduce oil-water interfacial tension. The anionic Gemini surfactant AN12-4-12 is the best in enhancing water flooding recovery efficiency, because it can reduce the oil-water interfacial tension to 5×10-3 mN•m-1. Increasing the concentration of AN12-4-12 is favorable to enhance water displacement recovery. Such as when injecting 0.5PV solution containing 800mg•L-1 AN12-4-12, enhancing water displacement recovery is 11.67%. AN12-4-12 has good adaptability to different salinities (5~25×104 mg•L-1) and low permeability reservoir in improving water displacement recovery. Adding non-ionic surfactant ANT into AN12-4-12 solution can further reduce oil-water interfacial tension and enhance water flooding recovery efficiency. For example, injecting 0.5PV surfactant solution containing 400mg•L-1 AN12-4-12 and 100mg•L-1 can enhance water displacement recovery of 10.7%.
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Saroj and Lalit Sharma. "Carbohydrate Derived Non-ionic Gemini Surfactants: A Mini Review." Mini-Reviews in Organic Chemistry 15, no. 5 (August 1, 2018): 404–11. http://dx.doi.org/10.2174/1570193x15666180108153502.

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Yi, Mengjiao, Ping Qi, Qi Fan, and Jingcheng Hao. "Ionic liquid crystals based on amino acids and gemini surfactants: tunable phase structure, circularly polarized luminescence and emission color." Journal of Materials Chemistry C 10, no. 5 (2022): 1645–52. http://dx.doi.org/10.1039/d1tc05265a.

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Koziróg, Anna, Anna Otlewska, Magdalena Gapińska, and Sylwia Michlewska. "Influence of Gemini Surfactants on Biochemical Profile and Ultrastructure of Aspergillus brasiliensis." Applied Sciences 9, no. 2 (January 10, 2019): 245. http://dx.doi.org/10.3390/app9020245.

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In this study, we investigated the activities of hexamethylene-1,6-bis-(N,N-dimethyl-N-dodecylammonium bromide) (C6), pentamethylene-1,5-bis-(N,N-dimethyl-N-dodecylammonium bromide) (C5), and their two neutral analogues: hexamethylene-1,6-bis-(N-methyl-N-dodecylamine) (A6) and pentamethylene-1,5-bis-(N-methyl-N-dodecylamine) (A5) at concentrations of ½ MIC, MIC, and 2 MIC (minimal inhibitory concentration) against hyphal forms of Aspergillus brasiliensis ATCC 16404. Enzymatic profiles were determined using the API-ZYM system. Extracellular proteins were extracted from the mycelia and analyzed using sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE). The ultrastructure was evaluated using a transmission electron microscope (TEM). Both groups of surfactants caused changes in the enzyme profiles. Larger changes in the number and concentration of enzymes were noted after the action of non-ionic gemini surfactants, which may have been due to the 100× higher concentration of neutral compounds. Larger differences between the protein profiles of the control sample and the biocide samples were observed following the use of cationic compounds. On the basis of TEM analyses, we found that, with increasing concentrations of compound C6, the mycelium cells gradually degraded. After treatment at 2 MIC, only membranous structures, multiform bodies, and dense electron pellets remained. Based on these results, we concluded that cationic gemini surfactants, in comparison with their non-ionic analogues, could have a wide range of practical applications as active compounds.
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Sharma, Lalit, Saroj, and Nirmal Singh. "Micellar Encapsulation of Some Polycyclic Aromatic Hydrocarbons by Glucose Derived Non-Ionic Gemini Surfactants in Aqueous Medium." Tenside Surfactants Detergents 51, no. 5 (September 15, 2014): 441–44. http://dx.doi.org/10.3139/113.110327.

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Pal, Nilanjan, Krishanu Samanta, and Ajay Mandal. "A novel family of non-ionic gemini surfactants derived from sunflower oil: Synthesis, characterization and physicochemical evaluation." Journal of Molecular Liquids 275 (February 2019): 638–53. http://dx.doi.org/10.1016/j.molliq.2018.11.111.

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Gawali, Ishwar T., and Ghayas A. Usmani. "Novel Non-ionic Gemini Surfactants from Fatty Acid and Diethanolamine: Synthesis, Surface-Active Properties and Anticorrosion Study." Chemistry Africa 3, no. 1 (December 9, 2019): 75–88. http://dx.doi.org/10.1007/s42250-019-00107-5.

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Sanchez Garrido, Rolando Abraham, Araceli ESPINOZA Vazquez, Clarisa Campechano-Lira, Edna Vázquez Vélez, Alejandra Vázquez Márquez, Ricardo Orozco Cruz, R. Galván Martínez, and Andrés Carmona-Hernandez. "Evaluation of a Non-Ionic Gemini Surfactant as Sweet Corrosion Inhibitor for X100 Steel in Sweet Brine Solution." ECS Transactions 110, no. 1 (February 13, 2023): 141–47. http://dx.doi.org/10.1149/11001.0141ecst.

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In the present research work, the evaluation of a non-ionic gemini surfactant derived from palm oil named bis(2-((2-palmitoamidoethyl) amino) ethyl) 1H-imidazole-4,5-dicarboxylate as an ecological corrosion inhibitor of X100 steel immersed in NaCl solution at 3.5% saturated with carbon dioxide (CO2) was analyzed. The electrochemical tests performed by Polarization Curves (PC) and Electrochemical Impedance Spectroscopy (EIS) showed that the efficiency of the inhibitor increased according to the increase in the concentration of the inhibitor. Likewise, the EIS results showed that the inhibitor performance increased as the exposure time elapsed.
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Dissertations / Theses on the topic "Non ionic gemini surfactants"

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FitzGerald, Paul Anthony. "Solution Behaviour of Polyethylene Oxide, Nonionic Gemini Surfactants." Thesis, The University of Sydney, 2002. http://hdl.handle.net/2123/504.

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In recent years there has been increasing interest in novel forms of surfactants. Of particular interest are gemini surfactants, which consist of two conventional surfactants joined by a spacer at the head groups, as they exhibit lower critical micelle concentrations than can be achieved by conventional surfactants. In this work, the self-assembly behaviour of several nonionic gemini surfactants with polyethylene oxide head groups (GemnEm, where n (= 20) is the number of carbons per tail and m (= 10, 15, 20 and 30) is the number of ethylene oxides per head group) were investigated. The Critical Micelle Concentrations (CMCs) were measured using a fluorescence probe technique. The CMCs are all ~2 x 10?7 M, with almost no variation with m. The CMCs are several orders of magnitude lower than conventional C12Em nonionic surfactants. The mixing behaviour of the gemini surfactants with conventional surfactants was also studied. They obeyed ideal mixing behaviour with both ionic and nonionic surfactants. Micelle morphologies were studied using Small Angle Neutron Scattering. The gemini surfactants with the larger head groups (i.e. Gem20E20 and Gem20E30) formed spherical micelles. Gem20E15 showed strong scattering at low Q, characteristic of elongated micelles. As the temperature was increased towards the cloud point, the scattering approached the Q-1 dependence predicted for infinite, straight rods. The existence of anisotropic micelles was supported by the viscosity of Gem20E15, which increases by several orders of magnitude on heating towards its cloud point. Phase behaviour was determined using Diffusive Interfacial Transport coupled to near-infrared spectroscopy. Much of the behaviour of these systems is similar to conventional nonionic surfactants. For example, Gem20E10 forms a dilute liquid isotropic phase (W) coexisting with a concentrated lamellar phase (La) at around room temperature and forms a sponge phase at higher temperatures. This is similar to the behaviour of C12E3 and C12E4. The other surfactants studied are all quite soluble in water and form liquid isotropic and hexagonal phases from room temperature. At higher concentrations Gem20E15 formed a cubic and then a lamellar phase while Gem20E20 formed a cubic phase and then an intermediate phase. This is also comparable to the phase behaviour of conventional nonionic surfactants except the intermediate phase, which is often only observed for surfactant systems with long alkyl tails.
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FitzGerald, Paul Anthony. "Solution Behaviour of Polyethylene Oxide, Nonionic Gemini Surfactants." University of Sydney. Chemistry, 2002. http://hdl.handle.net/2123/504.

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In recent years there has been increasing interest in novel forms of surfactants. Of particular interest are gemini surfactants, which consist of two conventional surfactants joined by a spacer at the head groups, as they exhibit lower critical micelle concentrations than can be achieved by conventional surfactants. In this work, the self-assembly behaviour of several nonionic gemini surfactants with polyethylene oxide head groups (GemnEm, where n (= 20) is the number of carbons per tail and m (= 10, 15, 20 and 30) is the number of ethylene oxides per head group) were investigated. The Critical Micelle Concentrations (CMCs) were measured using a fluorescence probe technique. The CMCs are all ~2 x 10?7 M, with almost no variation with m. The CMCs are several orders of magnitude lower than conventional C12Em nonionic surfactants. The mixing behaviour of the gemini surfactants with conventional surfactants was also studied. They obeyed ideal mixing behaviour with both ionic and nonionic surfactants. Micelle morphologies were studied using Small Angle Neutron Scattering. The gemini surfactants with the larger head groups (i.e. Gem20E20 and Gem20E30) formed spherical micelles. Gem20E15 showed strong scattering at low Q, characteristic of elongated micelles. As the temperature was increased towards the cloud point, the scattering approached the Q-1 dependence predicted for infinite, straight rods. The existence of anisotropic micelles was supported by the viscosity of Gem20E15, which increases by several orders of magnitude on heating towards its cloud point. Phase behaviour was determined using Diffusive Interfacial Transport coupled to near-infrared spectroscopy. Much of the behaviour of these systems is similar to conventional nonionic surfactants. For example, Gem20E10 forms a dilute liquid isotropic phase (W) coexisting with a concentrated lamellar phase (La) at around room temperature and forms a sponge phase at higher temperatures. This is similar to the behaviour of C12E3 and C12E4. The other surfactants studied are all quite soluble in water and form liquid isotropic and hexagonal phases from room temperature. At higher concentrations Gem20E15 formed a cubic and then a lamellar phase while Gem20E20 formed a cubic phase and then an intermediate phase. This is also comparable to the phase behaviour of conventional nonionic surfactants except the intermediate phase, which is often only observed for surfactant systems with long alkyl tails.
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Alexander, P. H. V. "Solution-membrane interactions by non-ionic surfactants." Thesis, Cardiff University, 1985. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.304749.

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Norman, Alexander Iain. "Phase transitions in poly(oxyalkylene) non-ionic surfactants." Thesis, University of Sheffield, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.269280.

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Cookey, Grace Agbizu. "Interactions of binary mixtures of ionic and non-ionic surfactants in aqueous solution." Thesis, University of Bristol, 2013. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.619452.

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A widely accepted model in obtaining the mixed micelle composition is Rubingh's thermodynamic model, in which CMC data from surface tension and conductivity measurements of mixed surfactant solutions are used to calculate compositions of mixed micelles. The validity of this model has not been previously challenged. In this study, the behaviour of binary mixtures of an anionic; sodium dodecylsulfate (SDS) and a cationic; dodecyltrimethyl ammonium bromide (DTAB) with non-ionic surfactants; N -dodecyl-N ,N -di mcthyl-3-ammoni o-l-prop
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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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Rogueda, Philippe G. A. "Equilibrium and dynamic solution properties of new suger based surfactants." Thesis, University of Bristol, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.319106.

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Willetts, Matthew. "Analytical methods for the determination of surfactants in surface water." Thesis, Sheffield Hallam University, 1999. http://shura.shu.ac.uk/20540/.

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The determination of surfactants in environmental surface water is required due to recent concern over possible adverse health effects that have been associated with them. This thesis is concerned with two aspects of the analysis of non-ionic and anionic surfactants in surface water. An HPLC phase-switching method has been developed in an attempt to overcome the problem of an interfering anionic species (thought to be humic acids) that masks the presence of any linear alkylbenzene sulphonate surfactants in river water samples. This problem has arisen following the development of an HPLC method for the determination of linear alkylbenzene sulphonates and alkylphenol ethoxylate surfactants in surface water in a previous research project. The phase-switching method allows the mobile phase to be diverted to either a C[1] or C[18] column or both. The linear alkylbenzene/humic acid portion was diverted to the C[18] column after elution from the C[1] column; the alkylphenol ethoxylate portion of the sample was then allowed to separate on the C[1] column as usual. Then the linear alkylbenzene / humic acid portion was separated on the C[18] column using a different mobile phase. The method works well with standards; however, with real samples it was not clear as to the identity of the peaks that may or not be linear alkylbenzene sulphonates. In addition, recent batches of the Spherisorb C[1] column were unable to adequately resolve the nonylphenol ethoxylate ethoxymers. The reason for this loss of resolution was investigated by elemental analysis and x-ray photoelectron spectroscopy. Bulk percentage carbon and surface carbon coverage both showed a similar trend. The earlier batch of Spherisorb column that produced the best resolution of nonylphenol ethoxylate ethoxymers had the lowest surface carbon coverage and the lowest percentage bulk carbon. Recent batches of the Spherisorb column along with columns from Supelco and Hypersil contained higher levels of carbon. These results suggest that resolution of the ethoxymers is due to the unreacted hydroxyl groups on the silica surface, and that the presence of the alkyl moiety actually hinders the process. In order to account for this a "pseudo reverse phase" mechanism has been invoked for this separation. The second section of this thesis involves the development of a new qualitative and quantitative method for the determination of nonylphenol ethoxylate surfactants in surface water by matrix-assisted laser desorption/ionisation time-of-flight mass spectrometry. The sample was mixed with a concentrated solution of 2,5-dihydroxybenzoic acid or alpha-cyano-4-hydroxycinnamic acid as a matrix. Approximately 1 muL of the resulting solution was added to a stainless steel target and, after evaporation of the solvent, the target was placed into the mass spectrometer. The resulting spectra showed intense [M+Na][+] and [M+K][+] adducts for each ethoxymer group. Extracted samples from the River Don analysed by this method showed a similar characteristic envelope of peaks, corresponding to sodium and potassium adducts for nonylphenol ethoxylates. For quantitative determinations Triton X-100, an octylphenol ethoxylate surfactant, was added as an internal standard. A concentrated solution of lithium chloride was also added to produce much less complicated spectra consisting of solely [M+Li][+] adducts. Good linear relationships were seen for each individual ethoxymer over the entire distribution. The method showed excellent results for spiked surface water samples, but the concentrations of nonylphenol ethoxylates in recent samples were below the current limit of detection for this method of 100 mug/L.
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Columbano, Angela. "Modification of microparticle surfaces by use of alkylpolyglycoside surfactants." Thesis, University College London (University of London), 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.327571.

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Scott, David A. "A novel dendritic architecture." Thesis, University of Oxford, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.325944.

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Books on the topic "Non ionic gemini surfactants"

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L, Wendt Pierce, and Hoysted Demario S, eds. Non-ionic surfactants. Hauppauge, NY: Nova Science Publishers, 2009.

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Wendt, Pierce L. Non-ionic surfactants. New York: Nova Science Publishers, 2010.

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Non-ionic surfactants. Hauppauge, NY: Nova Science Publishers, 2009.

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Heslop, C. A. Identification and extraction of alcohol ethoxylated non-ionic surfactants in environmental samples. 2000.

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Book chapters on the topic "Non ionic gemini surfactants"

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Balson, T., and M. S. B. Felix. "Biodegradability of non-ionic surfactants." In Biodegradability of Surfactants, 204–30. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-1348-9_7.

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Zhou, Ting, and Guiying Xu. "Aggregation Behavior of Ionic Liquid-Based Gemini Surfactants and Their Interaction with Biomacromolecules." In Ionic Liquid-Based Surfactant Science, 127–49. Hoboken, NJ: John Wiley & Sons, Inc, 2015. http://dx.doi.org/10.1002/9781118854501.ch6.

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Esumi, K. "Adsolubilization by mixtures of ionic and non-ionic surfactants." In Trends in Colloid and Interface Science XVI, 44–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/b11621.

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Esumi, K. "Adsolubilization by mixtures of ionic and non-ionic surfactants." In Trends in Colloid and Interface Science XVI, 44–47. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-36462-7_11.

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Florence, A. T., T. K. Law, and T. L. Whateley. "Thin Films of Non-Ionic Poloxamer Surfactants: Thinning and Polymerisation of Poloxamer 407." In Surfactants in Solution, 321–31. Boston, MA: Springer US, 1989. http://dx.doi.org/10.1007/978-1-4615-7990-8_23.

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Cases, J. M., and F. Villieras. "The Mechanisms of Collector Adsorption-Abstraction (Ionic and Non-Ionic Surfactants) on Heterogeneous Surfaces." In Innovations in Flotation Technology, 25–55. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-2658-8_2.

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Zheng, Yi, Zhongli Pan, Ruihong Zhang, Donghai Wang, and Bryan Jenkins. "Non-ionic Surfactants and Non-Catalytic Protein Treatment on Enzymatic Hydrolysis of Pretreated Creeping Wild Ryegrass." In Biotechnology for Fuels and Chemicals, 351–68. Totowa, NJ: Humana Press, 2007. http://dx.doi.org/10.1007/978-1-60327-526-2_35.

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Kianpisheh, Milad, Bahareh Rezaei, and Faramarz Afshar-Taromi. "Improved Conductivity and Film Forming of Transparent PEDOT:PSS Electrodes Using Non-ionic Surfactants." In Eco-friendly and Smart Polymer Systems, 181–83. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-45085-4_43.

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English, R. J., R. D. Jenkins, D. R. Bassett, and Saad A. Khan. "Rheology of a HASE Associative Polymer and Its Interaction with Non-Ionic Surfactants." In ACS Symposium Series, 369–80. Washington, DC: American Chemical Society, 2000. http://dx.doi.org/10.1021/bk-2000-0765.ch022.

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Stubenrauch, Cosima, and Brita Rippner Blomqvist. "Foam Films, Foams and Surface Rheology of Non-Ionic Surfactants: Amphiphilic Block Copolymers Compared with Low Molecular Weight Surfactants." In Colloid Stability, 263–306. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527631070.ch11.

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Conference papers on the topic "Non ionic gemini surfactants"

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Khan, Rizwan Ahmed, Mobeen Murtaza, Hafiz Mudaser Ahmad, Abdulazeez Abdulraheem, Muhammad Shahzad Kamal, and Mohamed Mahmoud. "Development of Novel Shale Swelling Inhibitors Using Hydrophobic Ionic Liquids and Gemini Surfactants for Water-Based Drilling Fluids." In SPE Middle East Oil & Gas Show and Conference. SPE, 2021. http://dx.doi.org/10.2118/204740-ms.

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Abstract In the last decade, hydrophilic Ionic liquids have been emerged as an additive in drilling fluids for clay swelling inhibition. However, the application of hydrophobic Ionic liquids as a clay swelling inhibitor have not been investigated. In this study, the combination of hydrophobic Ionic liquids and Gemini surfactant were studied to evaluate the inhibition performance. The novel combination of hydrophobic ionic liquid (Trihexyltetradecyl phosphonium bis(2,4,4-trimethyl pentyl) phosphinate) and cationic gemini surfactant (GB) was prepared by mixing various concentrations of both chemicals and then preparing water based drilling fluid using other drilling fluid additives such as rheological modifier, filtration control agent, and pH control agent. The wettability of sodium bentonite was determined by contact angle with different concentrations of combined solution. Some other experiments such as linear swelling, capillary suction test (CST) and bentonite swell index were performed to study the inhibition performance of ionic liquid. Different concentrations of novel combined ionic liquid and gemini surfactant were used to prepare the drilling fluids ranging from (0.1 to 0.5 wt.%), and their performances were compared with the base drilling fluid. The wettability results showed that novel drilling fluid having 0.1% Tpb-P - 0.5% GB wt.% concentration has a maximum contact angle indicating the highly hydrophobic surface. The linear swelling was evaluated over the time of 24 hours, and least swelling of bentonite was noticed with 0.1% Tpb-P - 0.5% GB wt.% combined solution compared to linear swelling in deionized water. Furthermore, the results of CST also suggested the improved performance of novel solution at 0.1% Tpb-P - 0.1% GB concentration. The novel combination The novel combination of hydrophobic ionic liquids and gemini surfactant has been used to formulate the drilling fluid for high temperature applications to modify the wettability and hydration properties of clay. The use of novel combined ionic liquid and gemini surfactant improves the borehole stability by adjusting the clay surface and resulted in upgraded wellbore stability.
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"Encapsulation of Poorly Water Soluble Drugs with Novel Non-Ionic Gemini Surfactants by Micellization." In Annual International Conference on Chemical Processes, Ecology & Environmental Engineering. International Academy of Engineers, 2016. http://dx.doi.org/10.15242/iae.iae0416403.

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Kizito, J. P. "Effect of Non-Ionic Surfactants on Nucleate Pool Boiling." In SPACE TECHNOLOGY AND APPLICATIONS INT.FORUM-STAIF 2003: Conf.on Thermophysics in Microgravity; Commercial/Civil Next Generation Space Transportation; Human Space Exploration; Symps.on Space Nuclear Power and Propulsion (20th); Space Colonization (1st). AIP, 2003. http://dx.doi.org/10.1063/1.1541286.

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El-Aooiti, Malek, Auke de Vries, and Derick Rousseau. "Destabilization of Particle-stabilized Emulsions with Non-ionic Surfactants." In 2022 AOCS Annual Meeting & Expo. American Oil Chemists' Society (AOCS), 2022. http://dx.doi.org/10.21748/swzy9436.

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Abstract:
"Particle-stabilized water-in-oil (W/O) emulsions are commonly sought for applications that demand long-term resistance against droplet coalescence. However, their remarkable stability may pose problems for uses that require controlled breakdown, such as for controlled release applications. Here, we investigated the demulsification of model W/O emulsions stabilized by glycerol monostearate (GMS) crystals solidified prior to emulsification. We studied the ability of the surfactants sorbitan monooleate (SMO), sorbitan monolaurate (SML), polyglycerol polyricinoleate (PGPR), citric acid esters of mono and diglycerides (CITREM), sorbitan trioleate (STO), and propylene glycol monolaurate (PgML) to act as demulsifiers based on their capacity to alter the wettability of interfacially-bound GMS crystals. Demulsification was promoted by the addition of SMO, SML, and CITREM, which promoted the transition of the GMS crystals from oil-wet to water-wet, thereby reducing their ability to stabilize the starting oil-continuous emulsions. Conversely, surfactants PGPR, STO, and PgML, did not sufficiently alter GMS crystal wettability to illicit demulsification. We found that two factors were necessary for a surfactant to act as a demulsifier, namely a strong affinity to the surface of GMS crystals as well as to the oil-water interface. From a compositional perspective, SMO, SML, and CITREM were effective demulsifiers because of their availability of sterically unhindered polar functional groups that can anchor to the surface of GMS crystals and polar dispersed phase droplets. Conversely, polar functional groups in PGPR and STO were sterically hindered, preventing adsorption to polar surfaces, while the propylene glycol head-group of PgML lacked polar character. Furthermore, it was shown that emulsion breakdown was concentration dependent, with surfactant concentration dominating release kinetics. Overall, this work showed that tuning the wettability of interfacially-bound GMS crystals could be used to destabilize particle-stabilized W/O emulsions, which may allow for the controllable breakdown of highly stable emulsions.
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Sokhanvarian, Khatere, Cornell Stanciu, Jorge M. Fernandez, Ahmed Ibrahim, and Hisham A. Nasr-El-Din. "Novel Non-Aromatic Non-Ionic Surfactants to Target Deep Carbonate Stimulation." In SPE International Conference on Oilfield Chemistry. Society of Petroleum Engineers, 2019. http://dx.doi.org/10.2118/193596-ms.

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Wang, Min, Jonathan Kaufman, Xin Chen, and Craig Sungail. "Development and Evaluation of Non-Ionic Polymeric Surfactants as Asphaltene Inhibitors." In SPE International Symposium on Oilfield Chemistry. Society of Petroleum Engineers, 2015. http://dx.doi.org/10.2118/173720-ms.

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Gatdula, Kristel M., and Emmanuel D. Revellame. "Salt-Induced Recovery of Volatile Organic Acids Using Non-Ionic Surfactants." In ASEC 2022. Basel Switzerland: MDPI, 2022. http://dx.doi.org/10.3390/asec2022-13817.

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El-Aooiti, Malek, Auke de Vries, and Dérick Rousseau. "Destabilization of particle-stabilized water-in-oil emulsions using non-ionic surfactants." In Virtual 2021 AOCS Annual Meeting & Expo. American Oil Chemists’ Society (AOCS), 2021. http://dx.doi.org/10.21748/am21.518.

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Jurado, E., M. Fernández-Serrano, J. Núñez, M. Lechuga, and G. Luzón. "Evolution of acute toxicity of non-ionic surfactants over the biodegradation process." In ENVIRONMENTAL TOXICOLOGY 2008. Southampton, UK: WIT Press, 2008. http://dx.doi.org/10.2495/etox080111.

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Tsang, Daniel C. W., and Boey H. Zhang. "Selective Removal of Naphthalene from Non-Ionic and Anionic Surfactants Using Activated Carbon." In 2010 4th International Conference on Bioinformatics and Biomedical Engineering (iCBBE). IEEE, 2010. http://dx.doi.org/10.1109/icbbe.2010.5514938.

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