Artykuły w czasopismach: „Dimeric Surfactants”

1

Zana, Raoul. "Gemini (dimeric) surfactants". Current Opinion in Colloid & Interface Science 1, nr 5 (październik 1996): 566–71. http://dx.doi.org/10.1016/s1359-0294(96)80093-8.

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Sekhon, B. S. "Gemini (dimeric) surfactants". Resonance 9, nr 3 (marzec 2004): 42–49. http://dx.doi.org/10.1007/bf02834987.

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Behjatmanesh-Ardakani, Reza, i Maryam Farsad. "On the Difference between Self-Assembling Process of Monomeric and Dimeric Surfactants with the Same Head to Tail Ratio: A Lattice Monte Carlo Simulation". Journal of Chemistry 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/525948.

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Experimental data show that gemini surfactants have critical micelle concentrations that are almost tenfold lower than the CMCs of single chain ones. It is believed that the spacer groups play an important role in this subject. Short hydrophilic or long hydrophobic spacers can reduce CMC dramatically. In this paper, self-assembling processes of double-chain and one-chain surfactants with the same head to tail ratio are compared. Dimeric chain structure is exactly double of single chain. In other words, hydrophilic-lyophilic balances of two chain models are the same. Two single chains are connected head-to-head to form a dimeric chain, without introducing extra head or tail beads as a spacer group. Premicellar, micellar, and shape/phase transition ranges of both models are investigated. To do this, lattice Monte Carlo simulation in canonical ensemble has been used. Results show that without introducing extra beads as spacer group, the CMC of (H3T3)2as a dimeric surfactant is much lower than the CMC of its similar single chain, H3T3. For dimeric case of study, it is shown that bolaform aggregates are formed.

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Zana, R., H. Lévy i K. Kwetkat. "Mixed Micellization of Dimeric (Gemini) Surfactants and Conventional Surfactants. I. Mixtures of an Anionic Dimeric Surfactant and of the Nonionic Surfactants C12E5and C12E8". Journal of Colloid and Interface Science 197, nr 2 (styczeń 1998): 370–76. http://dx.doi.org/10.1006/jcis.1997.5248.

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Tashiro, Katsumi, Keisuke Ohta, Xiaoguang Cui, Kazuo Nishizuka, Ken Yamamoto, Tomoharu Konzaki, Tsutomu Kobayashi i Yasuhiro Suzuki. "Effects of various forms of surfactant protein C on tidal volume in ventilated immature newborn rabbits". Journal of Applied Physiology 94, nr 4 (1.04.2003): 1519–26. http://dx.doi.org/10.1152/japplphysiol.00059.2001.

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Surfactant protein (SP)-C is characterized by α-helix structure and palmitoyl groups attached to two cysteine residues. We examined the function of palmitoylation and dimerization in promotion of tidal volume in immature newborn rabbits. Reconstituted surfactants were made from a mixture of synthetic phospholipids and porcine SP-B (basic mixture) by adding various forms of SP-Cs: normal SP-C isolated from porcine lungs and monomeric or dimeric forms of SP-C. These latter two were isolated from patients with pulmonary alveolar proteinosis and were less palmitoylated. Animals were ventilated at an inspiratory pressure of 25 cmH2O. Median tidal volumes were <2 ml/kg in nontreated controls, 7.7 ml/kg in animals receiving the basic mixture without SP-C, and >18 ml/kg in animals treated with reconstituted surfactants containing 3% normal or 2% dimeric SP-C ( P < 0.05 vs. basic mixture). The physiological effect of basic mixture was not improved by monomeric SP-C. We conclude that palmitoyl groups are important for the physiological effects of SP-C and that the dimeric form also improves physiological effects.

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Kumar, Naveen, Rashmi Tyagi i V. K. Tyagi. "Efficiency of single and mixed dimeric surfactants micelles on solubil-ization of polycyclic aromatic hydrocarbons". Applied Chemical Engineering 3, nr 1 (16.03.2020): 8. http://dx.doi.org/10.24294/ace.v3i1.545.

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The solubilization of polycyclic aromatic hydrocarbons (PAHs) such as naphthalene, phenanthrene and pyrene by single and mixed anionic dimeric surfactants was investigated and correlated with micellar properties of these surfactants. The surface and micellar properties of single and binary mixed combinations of anionic dimeric surfactants have been studied through surface tension as well as conductivity measurements at 300 K. The associations between their micelle properties and solubilizing efficiency towards PAHs have been quantified and discussed in terms of the molar solubilization ratio (MSR), micelle-water partition coefficient (Km) and standard free energy of solubilization (ΔG0S).The negative value of ΔG0Sexhibits spontaneously the solubilization process. The MSR values increase with the order “pyrene < phenanthrene < naphthalene”. The current study provides significant information for the selection of mixed dimeric surfactants for solubilizing water-insoluble compounds.

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Silin, M. A., L. A. Magadova, D. N. Malkin,, P. K. Krisanova, S. A. Borodin i A. A. Filatov. "Complex Study of a Hydraulic Fracturing Fluid Based on a Pseudo-Dimeric Surfactant". Chemistry and Technology of Fuels and Oils 632, nr 4 (2022): 43–49. http://dx.doi.org/10.32935/0023-1169-2022-632-4-43-49.

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The paper presents a complex study of compositions based on pseudo-dimeric surfactants. Rheological and oscillation studies, proppant test (proppant drop rate and static proppant settling), composition’s influence on clay swelling were carried out.In the course of research, it was found that hydraulic fracturing fluids based on pseudo-dimeric surfactants have advantages over similar systems.

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Alargova, R. G., I. I. Kochijashky, M. L. Sierra, K. Kwetkat i R. Zana. "Mixed Micellization of Dimeric (Gemini) Surfactants and Conventional Surfactants". Journal of Colloid and Interface Science 235, nr 1 (marzec 2001): 119–29. http://dx.doi.org/10.1006/jcis.2000.7311.

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Castro, Mariano J. L., José Kovensky i Alicia Fernández Cirelli. "New dimeric surfactants from alkyl glucosides". Tetrahedron 55, nr 44 (październik 1999): 12711–22. http://dx.doi.org/10.1016/s0040-4020(99)00786-3.

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Laschewsky, Andr�, Klaus Lunkenheimer, Rivo H. Rakotoaly i Laurent Wattebled. "Spacer effects in dimeric cationic surfactants". Colloid and Polymer Science 283, nr 5 (28.10.2004): 469–79. http://dx.doi.org/10.1007/s00396-004-1219-8.

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Datir, Kirti, Harshada Shinde i Amit P. Pratap. "Preparation of a Gemini Surfactant from Mixed Fatty Acid and its Use in Cosmetics". Tenside Surfactants Detergents 58, nr 1 (1.01.2021): 67–73. http://dx.doi.org/10.1515/tsd-2020-2278.

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Abstract Among the surfactants, dimeric surfactants represent a niche group with multifunctional properties. In this work a modified gemini surfactant was synthesized using symmetrical fatty acids. Due to the spacers used to combine the two symmetrical monomers, the synthesized gemini surfactant is cationic. The structure of the compound was confirmed with 1H-NMR. The most advantageous property of the gemini surfactant is that it has a lower surface tension, i. e. less than 35 mNm–1 at 25°C, compared to monomeric surfactants. The surface tension was determined with a Kyowa tensiometer. The CMC (critical micelle formation concentration) was calculated according to the pyrene method and detected by UV spectroscopy at 25°C. The very low CMC is another market advantage of the gemini surfactant. Hydrophobicity and hydrophilicity of the synthesized compound were checked by the emulsification method. The ability of the synthesized gemini surfactant to wet and foam and the emulsification index at different pH values were tested. Based on the results, the gemini surfactant was used in formulations for hair and skin care. Conditioners and creams were prepared with the synthesized compound and the properties were analyzed at different concentrations of the gemini surfactant in the respective formulation.

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12

Panda, Manorama, Nazish Fatma i Mohammad Kamil. "Synthesis, Characterization and Solution Properties of Novel Cationic Ester-Based Gemini Surfactants". Zeitschrift für Physikalische Chemie 233, nr 5 (27.05.2019): 707–20. http://dx.doi.org/10.1515/zpch-2017-1000.

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Abstract The present investigation involves the synthesis of a series of novel green ethylene oxide-linked diester-functionalized cationic gemini surfactants 2,2′-[(oxybis(ethane-1,2-diyl))bis(oxy)]bis(N-alkyl-N,N-dimethyl-2-oxoethanaminium) dichloride (Cm-DEG-Cm; m = 12, 14, 16). These compounds were characterized by 1H-NMR, MS-ESI (+), FT-IR spectroscopy and elemental analysis; their solution properties were evaluated by surface tension and rheology measurements. The dimeric surfactant, Cm-DEG-Cm, possesses improved physicochemical properties as compared to its monomeric counterpart. Much lower critical micelle concentration (cmc) makes the cationic gemini surfactants more useful for the biomedical, pharmaceutical, industrial and academic sectors. Longer the alkyl chain of surfactants lower are the cmc values, the order is C16-DEG-C16 < C14-DEG-C14 < C12-DEG-C12. For all the three synthesized gemini surfactants no cloud point was noticed in between the temperatures 0 °C to 100 °C at the concentrations 0.002 mM, 0.02 mM and 0.2 mM of the aqueous surfactant solutions which is a beneficial factor for the use of these amphiphiles in various areas of application.

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13

Zhao, Jing, Sherril D. Christian i B. M. Fung. "Mixtures of Monomeric and Dimeric Cationic Surfactants". Journal of Physical Chemistry B 102, nr 39 (wrzesień 1998): 7613–18. http://dx.doi.org/10.1021/jp982131g.

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Balcerzak, Mateusz, Zuzanna Pietralik, Ludwik Domka, Andrzej Skrzypczak i Maciej Kozak. "Adsorption of dimeric surfactants in lamellar silicates". Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 364 (grudzień 2015): 108–15. http://dx.doi.org/10.1016/j.nimb.2015.07.135.

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Kumar, Naveen, i Rashmi Tyagi. "Industrial Applications of Dimeric Surfactants: A Review". Journal of Dispersion Science and Technology 35, nr 2 (30.01.2014): 205–14. http://dx.doi.org/10.1080/01932691.2013.780243.

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Kumar, Naveen, i Rashmi Tyagi. "Dimeric Surfactants: Promising Ingredients of Cosmetics and Toiletries". Cosmetics 1, nr 1 (21.11.2013): 3–13. http://dx.doi.org/10.3390/cosmetics1010003.

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Karaborni, S., K. Esselink, P. A. J. Hilbers, B. Smit, J. Karthauser, N. M. van Os i R. Zana. "Simulating the Self-Assembly of Gemini (Dimeric) Surfactants". Science 266, nr 5183 (14.10.1994): 254–56. http://dx.doi.org/10.1126/science.266.5183.254.

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Castro, Mariano J. L., Jose Kovensky i Alicia Fernandez Cirelli. "ChemInform Abstract: New Dimeric Surfactants from Alkyl Glucosides." ChemInform 31, nr 5 (11.06.2010): no. http://dx.doi.org/10.1002/chin.200005233.

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Brycki, Bogumił, Małgorzata Waligórska i Adrianna Szulc. "The biodegradation of monomeric and dimeric alkylammonium surfactants". Journal of Hazardous Materials 280 (wrzesień 2014): 797–815. http://dx.doi.org/10.1016/j.jhazmat.2014.08.021.

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Da Silveira Júnior, Pedro Belchior, Vera Aparecida de Oliveira Tiera i Marcio José Tiera. "A fluorescence probe study of gemini surfactants in aqueous solution: a comparison between n-2-n and n-6-n series of the alkanediyl-a,w-bis (dimethylalkylammonium bromides)". Ecletica Quimica 32, nr 2 (26.06.2007): 47–54. http://dx.doi.org/10.26850/1678-4618eqj.v32.2.2007.p47-54.

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Two series of alkanediyl-a,w-bis (dimethylalkylammonium bromide (n-2-n and n-6-n; n=8, 10,12,and 16) have been synthesized and their micelles properties studied in aqueous solution using pyrene,pyrenecarboxaldehyde (PCA) and 1,8 anilinonaphtalene sulfonic acid sodium salt (ANS) as fluorescentprobes. The micelles from these surfactants have been characterized on the basis of the informationprovided by micelle-solubilized fluorescent probes. The obtained results indicated that the surfactantconcentration at which a marked decrease in l max parameter of pyrenecarboxaldehyde (PCA) occurscorresponds to the CMC determined by conductimetric measurements. Changes in the emission spectraof ANS and PCA observed in the submicellar range for both surfactants series (n-2-n and n-6-n) wereinterpreted as formation of pre-aggregates. It was found that the dimeric surfactants with long spacer (s=6) form more hydrated aggregates when compared with those formed by the n-2-n and C n TAB surfactantsseries. This was attributed to a more difficult packing of n-6-n surfactant molecules to form micelles.

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21

Naqvi, Andleeb Z., Sahar Noori i Kabir-ud-Din Kabir-ud-Din. "Mixed micellization of dimeric surfactant–amphiphilic drug systems: effect of surfactant structure". RSC Advances 6, nr 24 (2016): 20324–36. http://dx.doi.org/10.1039/c5ra24058a.

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For their applications as drug delivery vehicles, the mixed interfacial/micellar behaviour of zwitterionic, cocogem and anionic dimeric surfactants with an amphiphilic drug imipramine hydrochloride in aqueous solutions has been investigated.

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Shumeiko, Alexander, Michael Kostrikin, Ilya Kapitanov, Anna Serdyuk, Nikolay Burakov i Anatoly Popov. "Synthesis of functionalized by an oxime group surfactants on the basis of imidazole, pyridine and alkylamines". Ukrainian Chemistry Journal 85, nr 8 (15.08.2019): 94–105. http://dx.doi.org/10.33609/0041-6045.85.8.2019.94-105.

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Methods have been developed for the synthe-sis of a series of monomeric and dimeric surfactants functionalized by an oxime group based on imid-azole, pyridine and alkylamines. Alkyl radicals of varying degrees of branching were used, both as sub-stituents at the nitrogen atom of the head group and as spacers in the formation of dimeric products. This allowed to create a whole spectrum of supramo-lecular systems with different physicochemical pro-perties and reactivity.Methods of obtaining a number of intermedi-ate products were improved, primarily for the reac-tion of the imidazole alkylation using interphase ca-talysis conditons — solid phase-liquid. The method of obtaining surfactants based on imidazole consisted in the interaction of alkylimidazoles with chloro-acetaloxime in a suitable solvent or with chloro-acetone and subsequent reaction with a hydroxyla-mine solution. In the preparation of pyridine-based surfactants, the corresponding oxo-substituted pyri-dine was reacted with a hydroxylamine solution, fol-lowed by reaction of the obtained product with al-kyl halide. A method has been developed for the syn-thesis of functionalized surfactants based on alipha-tic amines, where for monomeric products a path is chosen that is associated with the sequential alkyla-tion of 1-chloroacetoxime with dimethylamine and dodecyl bromide, and for dimeric ones, the direct interaction of 1,3-dichloroacetoxime with 1,1-dime-thyl-1-dodecylamine.The composition, structure and purity of the obtained compounds were confirmed by NMR spec-troscopy, thin-layer chromatography and elemental analysis. NMR spectra were recorded on a BRUKER Avance II 400 instrument (400 MHz), TMS was used as an internal standard. Chromatography in a thin layer of silica gel was performed on Merck Si-licaGel 60 F254 plates (eluent — chloroform: meth-anol = 10:1).The data presented by us testify to the pro-spects of the chosen pathway for structural modifica-tion of surfactants functionalized by the oxime group, and give direction for the further design of such microheterogeneous systems.

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Cappelletti, Giuseppe, Silvia Ardizzone, Francesca Spadavecchia, Daniela Meroni i Iolanda Biraghi. "Mesoporous Titania Nanocrystals by Hydrothermal Template Growth". Journal of Nanomaterials 2011 (2011): 1–9. http://dx.doi.org/10.1155/2011/597954.

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Mesoporous TiO2nanocrystals have been synthetized by a classical sol-gel route integrated by an hydrothermal growth step using monomeric (dodecylpyridinium chloride, DPC) or dimeric gemini-like (GS3) surfactants as template directing agents. Adsorption isotherms at the solid/liquid interface of the two surfactants have been obtained on aqueous dispersion of titania; the nature of the oxide/adsorbate interactions and the molecules orientation/coarea are discussed. The effects produced by the presence of the two surfactants on the different morphological (surface area, porosity, and shape) and structural (phase composition and aggregate size) features of the final TiO2samples, calcined at600∘C, are discussed.

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Kumar, Naveen, i Rashmi Tyagi. "Characteristic and Application of Anionic Dimeric Surfactants: A Review". Tenside Surfactants Detergents 56, nr 3 (15.05.2019): 172–79. http://dx.doi.org/10.3139/113.110614.

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Castro, Mariano, José Kovensky i Alicia Cirelli. "Structure-Properties Relationship of Dimeric Surfactants from Butyl Glucosides". Molecules 5, nr 12 (22.03.2000): 608–9. http://dx.doi.org/10.3390/50300608.

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Diamant, Haim, i David Andelman. "Dimeric Surfactants: A Simplified Model for the Spacer Chain". Langmuir 11, nr 9 (wrzesień 1995): 3605–6. http://dx.doi.org/10.1021/la00009a055.

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Zana, R., i Y. Talmon. "Dependence of aggregate morphology on structure of dimeric surfactants". Nature 362, nr 6417 (marzec 1993): 228–30. http://dx.doi.org/10.1038/362228a0.

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Renouf, Philippe, Charles Mioskowski, Luc Lebeau, Dominique Hebrault i Jean-Roger Desmurs. "Dimeric surfactants: First synthesis of an asymmetrical gemini compound". Tetrahedron Letters 39, nr 11 (marzec 1998): 1357–60. http://dx.doi.org/10.1016/s0040-4039(97)10835-8.

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Weihs, Daphne, Dganit Danino, Aurora Pinazo-Gassol, Lourdes Perez, Elias I. Franses i Yeshayahu Talmon. "Self-aggregation in dimeric arginine-based cationic surfactants solutions". Colloids and Surfaces A: Physicochemical and Engineering Aspects 255, nr 1-3 (marzec 2005): 73–78. http://dx.doi.org/10.1016/j.colsurfa.2004.11.035.

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Danino, Dganit, Yeshayahu Talmon i Raoul Zana. "Vesicle-to-Micelle Transformation in Systems Containing Dimeric Surfactants". Journal of Colloid and Interface Science 185, nr 1 (styczeń 1997): 84–93. http://dx.doi.org/10.1006/jcis.1996.4545.

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Andrzejewska, W., M. Wilkowska, M. Chrabąszczewska i M. Kozak. "The study of complexation between dicationic surfactants and the DNA duplex using structural and spectroscopic methods". RSC Advances 7, nr 42 (2017): 26006–18. http://dx.doi.org/10.1039/c6ra24978g.

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Dicationic (also known as gemini or dimeric) bis-alkylimidazolium surfactants belong to a group of non-viral transfection systems proposed for the successful introduction of different types of nucleic acids (i.e., siRNA, DNA oligomers, and plasmid DNA) into living cells.

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Azum, Naved, Malik Abdul Rub, Abdullah M. Asiri, Khalid A. Alamry i Hadi M. Marwani. "Self-Aggregation of Cationic Dimeric and Anionic Monomeric Surfactants with Nonionic Surfactant in Aqueous Medium". Journal of Dispersion Science and Technology 35, nr 3 (4.03.2014): 358–63. http://dx.doi.org/10.1080/01932691.2013.788451.

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Chen, Zhi, Yujun Feng, Dongliang Zhou, Puxin Zhu i Dacheng Wu. "Synthesis and monolayer film of a series of new twin-tailed gemini cationic surfactants at the air/water interface". Open Chemistry 6, nr 3 (1.09.2008): 477–81. http://dx.doi.org/10.2478/s11532-008-0031-6.

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AbstractA series of new dimeric surfactants, twin-tailed gemini surfactants, 2(12)-s-2(12), were successfully prepared and characterized, and their monolayer films investigated by the measurement of surface pressure-area (π-A) and surface pressure-time (π-t) isotherms at the air/water interface by a Langmuir film balance. Compared to their monomeric counterparts, their collapse pressure (γcollapse) is smaller, whilst all the molecular area parameters are larger. The limited area (Alimited) and the initial area (Ainitial) of these twin-tailed gemini surfactants change with increasing spacer length s, and the surface pressure decreases with increasing time. It was also found that the higher the initial surface pressure, the larger the attenuation.

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Zhao, Jinzhou, Ming Zhou, Xu Wang i Yan Yang. "Synthesis and Surface Active Properties of Dimeric Gemini Sulfonate Surfactants". Tenside Surfactants Detergents 51, nr 1 (20.01.2014): 26–31. http://dx.doi.org/10.3139/113.110282.

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Zakharov, Lucia Ya, Vyacheslav E. Semenov, Mikhail A. Voronin, Farida G. Valeeva, Lyudmila A. Kudryavtseva, Rashit Kh Giniatullin, Vladimir S. Reznik i Alexander I. Konovalov. "Supramolecular catalytic systems based on dimeric pyrimidinic surfactants and polyethyleneimine". Mendeleev Communications 18, nr 3 (maj 2008): 158–60. http://dx.doi.org/10.1016/j.mencom.2008.05.016.

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Gao, Chunli, Anna Millqvist-Fureby, Michael J. Whitcombe i Evgeny N. Vulfson. "Regioselective synthesis of dimeric (gemini) and trimeric sugar-based surfactants". Journal of Surfactants and Detergents 2, nr 3 (lipiec 1999): 293–302. http://dx.doi.org/10.1007/s11743-999-0080-9.

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Wang, Wenjing, Dong An i Zhiwen Ye. "Synthesis and properties of amino acid glucose ester dimeric surfactants". Journal of Dispersion Science and Technology 39, nr 2 (16.05.2017): 292–97. http://dx.doi.org/10.1080/01932691.2017.1316204.

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Faustino, Célia M. C., António R. T. Calado i Luís Garcia-Rio. "Dimeric and monomeric surfactants derived from sulfur-containing amino acids". Journal of Colloid and Interface Science 351, nr 2 (listopad 2010): 472–77. http://dx.doi.org/10.1016/j.jcis.2010.08.007.

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Sharma, K. Shivaji, P. A. Hassan i Animesh K. Rakshit. "Self aggregation of binary surfactant mixtures of a cationic dimeric (gemini) surfactant with nonionic surfactants in aqueous medium". Colloids and Surfaces A: Physicochemical and Engineering Aspects 289, nr 1-3 (październik 2006): 17–24. http://dx.doi.org/10.1016/j.colsurfa.2006.04.004.

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Brunet, Kévin, Cheikh A. B. Diop, Alexia Chauzy, Noémie Prébonnaud, Sandrine Marchand, Blandine Rammaert i Frédéric Tewes. "Improved In Vitro Anti-Mucorales Activity and Cytotoxicity of Amphotericin B with a Pegylated Surfactant". Journal of Fungi 8, nr 2 (27.01.2022): 121. http://dx.doi.org/10.3390/jof8020121.

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The aim of this study was to evaluate the effect of the combination of amphotericin B (AmB) and various non-ionic surfactants on the anti-Mucorales activity of AmB, the toxicity of the combination on eukaryotic cells and the modification of AmB aggregation states. Checkerboards were performed on five genera of Mucorales (12 strains) using several combinations of different surfactants and AmB. These data were analyzed by an Emax model. The effect of surfactants on the cytotoxic activity of AmB was then evaluated for red blood cells and two eukaryotic cell lines by absorbance and propidium iodide internalization. Finally, the effect of polyethylene glycol (15)-hydroxystearate (PEG15HS) on the aggregation states of AmB was evaluated by UV-visible spectrometry. PEG15HS increased the efficacy of AmB on four of the five Mucorales genera, and MICs of AmB were decreased up to 68-fold for L. ramosa. PEG15HS was the only surfactant to not increase the cytotoxic activity of AmB. Finally, the analysis of AmB aggregation states showed that the increased efficacy of AmB and the absence of toxicity are related to an increase in monomeric and polyaggregated forms of AmB at the detriment of the dimeric form. In conclusion, PEG15HS increases the in vitro efficacy of AmB against Mucorales at low concentration, without increasing its toxicity; this combination could therefore be evaluated in the treatment of mucormycosis.

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41

Danino, D., Y. Talmon i R. Zana. "Alkanediyl-.alpha.,.omega.-Bis(Dimethylalkylammonium Bromide) Surfactants (Dimeric Surfactants). 5. Aggregation and Microstructure in Aqueous Solutions". Langmuir 11, nr 5 (maj 1995): 1448–56. http://dx.doi.org/10.1021/la00005a008.

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CHAILLEY-HEU, Bernadette, Sandrine RUBIO, Jean-Philippe ROUGIER, Robert DUCROC, Anne-Marie BARLIER-MUR, Pierre RONCO i R. Jacques BOURBON. "Expression of hydrophilic surfactant proteins by mesentery cells in rat and man". Biochemical Journal 328, nr 1 (15.11.1997): 251–56. http://dx.doi.org/10.1042/bj3280251.

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Human peritoneal dialysis effluent (PDE) contains a phosphatidylcholine-rich compound similar to the surfactant that lines lung alveoli. This material is secreted by mesothelial cells. Lung surfactant is also characterized by four proteins essential to its function. After having long been considered as lung-specific, some of them have been found in gastric and intestinal epithelial cells. To explore further the similarity between lung and peritoneal surfactants, we investigated whether mesothelial cells also produce surfactant proteins. We used rat transparent mesentery, human visceral peritoneum biopsies and PDE. Surfactant proteins were searched for after one- and two-dimensional SDS/PAGE and Western blotting. On a one-dimensional Western blot, bands at 38 and 66 kDa in rat mesentery, and at 38 and 66 kDa in human peritoneal mesothelial cells (in vivo and in vitro) and PDE, corresponded to monomeric and dimeric forms of lung surfactant protein A (SP-A). On two-dimensional Western blots, the 32 and 38 kDa spots in mesentery and PDE localized at the acidic pH appropriate to the SP-A monomer's isoelectric point. SP-D was also identified at the same 43 kDa molecular mass as in lung. SP-B was not detected in mesenteric samples. Expression of SP mRNA species was also assessed by reverse transcriptase-PCR, which was performed with specific primers of surfactant protein cDNA sequences. With primers of SP-A and SP-D, DNA fragments of the same size were amplified in lung and mesentery, indicating the presence of SP-A and SP-D mRNA species. These fragments were labelled by appropriate probes in a Southern blot. No amplification was obtained for SP-B. These results show that mesentery cells produce SP-A and SP-D, although they are of embryonic origin (mesodermal) and are different from those of the lung and digestive tract (endodermal) that secrete these surfactants.

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Aswal, V. K., S. De, P. S. Goyal, S. Bhattacharya i R. K. Heenan. "Small-angle neutron scattering study of micellar structures of dimeric surfactants". Physical Review E 57, nr 1 (1.01.1998): 776–83. http://dx.doi.org/10.1103/physreve.57.776.

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Jurašin, Darija, Igor Weber i Nada Filipović-Vinceković. "Phase Behavior in Mixtures of Cationic Dimeric and Anionic Monomeric Surfactants". Journal of Dispersion Science and Technology 30, nr 5 (13.04.2009): 622–33. http://dx.doi.org/10.1080/01932690802598481.

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Kumar, Naveen, i Rashmi Tyagi. "Synthesis of anionic carboxylate dimeric surfactants and their interactions with electrolytes". Journal of Taibah University for Science 9, nr 1 (styczeń 2015): 69–74. http://dx.doi.org/10.1016/j.jtusci.2014.06.005.

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Martín, Victoria Isabel, Rafael R. de la Haba, Antonio Ventosa, Eleonora Congiu, José Julio Ortega-Calvo i María Luisa Moyá. "Colloidal and biological properties of cationic single-chain and dimeric surfactants". Colloids and Surfaces B: Biointerfaces 114 (luty 2014): 247–54. http://dx.doi.org/10.1016/j.colsurfb.2013.10.017.

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Chorro, C., M. Chorro, O. Dolladille, S. Partyka i R. Zana. "Adsorption of Dimeric (Gemini) Surfactants at the Aqueous Solution/Silica Interface". Journal of Colloid and Interface Science 199, nr 2 (marzec 1998): 169–76. http://dx.doi.org/10.1006/jcis.1997.5341.

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Andrzejewska, Weronika, Michalina Wilkowska, Andrzej Skrzypczak i Maciej Kozak. "Ammonium Gemini Surfactants Form Complexes with Model Oligomers of siRNA and dsDNA". International Journal of Molecular Sciences 20, nr 22 (7.11.2019): 5546. http://dx.doi.org/10.3390/ijms20225546.

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Dimeric cationic surfactants (gemini-type) are a group of amphiphilic compounds with potential use in gene therapy as effective carriers for nucleic acid transfection (i.e., siRNA, DNA, and plasmid DNA). Our studies have shown the formation of lipoplexes composed of alkanediyl-α,ω-bis[(oxymethyl)dimethyldodecylammonium] chlorides and selected 21-base-pair nucleic acid (dsDNA and siRNA) oligomers. To examine the structure and physicochemical properties of these systems, optical microscopy, circular dichroism spectroscopy (CD), small-angle X-ray scattering of synchrotron radiation (SR-SAXS), and agarose gel electrophoresis (AGE) were used. The lengths of spacer groups of the studied surfactants had a significant influence on the surfactants’ complexing properties. The lowest charge ratio (p/n) at which stable lipoplexes were observed was 1.5 and the most frequently occurring microstructure of these lipoplexes were cubic and micellar phases for dsDNA and siRNA, respectively. The cytotoxicity tests on HeLa cells indicated the non-toxic concentration of surfactants to be at approximately 10 µM. The dicationic gemini surfactants studied form complexes with siRNA and dsDNA oligomers; however, the complexation process is more effective towards siRNA. Therefore these systems could be applied as transfection systems for therapeutic nucleic acids.

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Selmani, Atiđa, Johannes Lützenkirchen, Kristina Kučanda, Dario Dabić, Engelbert Redel, Ida Delač Marion, Damir Kralj, Darija Domazet Jurašin i Maja Dutour Sikirić. "Tailoring the stability/aggregation of one-dimensional TiO2(B)/titanate nanowires using surfactants". Beilstein Journal of Nanotechnology 10 (13.05.2019): 1024–37. http://dx.doi.org/10.3762/bjnano.10.103.

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The increased utilization of one-dimensional (1D) TiO2 and titanate nanowires (TNWs) in various applications was the motivation behind studying their stability in this work, given that stability greatly influences both the success of the application and the environmental impact. Due to their high abundance in aqueous environments and their rich technological applicability, surfactants are among the most interesting compounds used for tailoring the stability. The aim of this paper is to determine the influence of surfactant molecular structure on TNW stability/aggregation behavior in water and aqueous NaBr solution by dynamic and electrophoretic light scattering. To accomplish this, two structurally different quaternary ammonium surfactants (monomeric DTAB and the corresponding dimeric 12-2-12) at monomer and micellar concentrations were used to investigate TNW stability in water and NaBr. It was shown that TNWs are relatively stable in Milli-Q water. However, the addition of NaBr induces aggregation, especially as the TNW mass concentration increases. DTAB and 12-2-12 adsorb on TNW surfaces as a result of the superposition of favorable electrostatic and hydrophobic interactions. As expected, the interaction of TNWs with 12-2-12 was stronger than with DTAB, due to the presence of two positively charged head groups and two hydrophobic tails. As a consequence of the higher adsorption of 12-2-12, TNWs remained stable in both media, while DTAB showed an opposite behavior. In order to gain more insight into changes in the surface properties after surfactant adsorption on the TNW surface, a surface complexation model was employed. With this first attempt to quantify the contribution of the surfactant structure on the adsorption equilibrium according to the observed differences in the intrinsic log K values, it was shown that 12-2-12 interacts more strongly with TNWs than DTAB. The modelling results enable a better understanding of the interaction between TNWs and surfactants as well as the prediction of the conditions that can promote stabilization or aggregation.

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Franke, Maximilian Eberhard, i Heinz Rehage. "Synthesis and characterisation of carboxy amide-bonded pyridinium Gemini surfactants: influence of the nature of the spacer group and counterions on the aggregation behaviour". Tenside Surfactants Detergents 59, nr 2 (28.02.2022): 111–21. http://dx.doi.org/10.1515/tsd-2021-2401.

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Abstract A series of novel dimeric pyridinium surfactants has been synthesised and the effects of a semi-flexible p-xylyl spacer and flexible, polyethylene glycol spacers have been studied. The nature of the spacer determines solubility and aggregation behaviour in two- and three-dimensional systems. Some of these insoluble compounds form two-dimensional, rigid-condensed structures at the air–water interface, while others form liquid-analogue monolayers. Whereas the latter compounds become soluble after exchange of the counterions, the former remain insoluble. The aggregation behaviour of Langmuir layers was, inter alia, investigated by Brewster angle microscopy. The micellisation behaviour of diluted aqueous solutions of soluble surfactants was primarily investigated by conductometric measurements and thermodynamic parameters of aggregation have been deduced with respect to the spacer length.

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