Relevant bibliographies by topics / Azo-surfactant

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  1. Journal articles
  2. Dissertations / Theses
  3. Conference papers

Academic literature on the topic 'Azo-surfactant'

Author: Grafiati
Published: 4 February 2023

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Journal articles on the topic "Azo-surfactant"

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Shahi, Neelam, Kumar Shah, Prasad Yadav, and Ajaya Bhattarai. "The spectral study of azo dye and cationic surfactant interaction in ethanol-water mixture." Journal of the Serbian Chemical Society 86, no. 5 (2021): 483–94. http://dx.doi.org/10.2298/jsc201116020s.

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The interaction of the azo dye methyl red (MR) with dodecyl trimethyl ammonium bromide (DTAB) has been studied by the spectrometric methods through the azo-hydrazone tautomeric behaviour of MR for a series of the ethanol?water system (0.1, 0.2, 0.3 and 0.4 volume fractions of ethanol) at room temperature. The critical micelle concentration was determined using the conductometric technique with the increased ethanol volume, influenced by the solvent polarity and the architectural flexibility of methyl red. The azo form of methyl red brings the electrostatic interaction with the cationic surfactant through the adsorption phenomenon. The binding parameters were calculated with the aid of a modified Benesi?Hildebrand equation.
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Abdallah, Dalia, Matthew J. Cully, Yuzhuo Li, and Devon A. Shipp. "Stoichiometric complexes of polyelectrolyte and azo-functionalized surfactant." Colloid and Polymer Science 286, no. 6-7 (January 8, 2008): 739–45. http://dx.doi.org/10.1007/s00396-007-1827-1.

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Liu, Z., D. A. Edwards, and R. G. Luthy. "Nonionic Surfactant Sorption onto Soil." Water Science and Technology 26, no. 9-11 (November 1, 1992): 2337–40. http://dx.doi.org/10.2166/wst.1992.0731.

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Experiments in batch soil/aqueous systems were conducted to evaluate the sorption onto soil of four nonionic surfactants. At bulk solution surfactant concentration less than the respective critical micelle (aggregate) concentration (CMC or CAC), sorption can be assessed using a surface tension technique and can be characterized with a Freundlich isotherm. At bulk solution surfactant concentrations equal to or greater than the critical concentration, sorption of the micelle-forming surfactants can be assessed by a spectrophotometric technique with an azo dye and had a constant value; sorption of the lamellae-forming surfactant can be assessed by a chemical oxidation technique and, however, appeared to be an increasing function of the surfactant dose.
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Czajka, A., G. Liao, O. O. Mykhaylyk, and S. P. Armes. "In situ small-angle X-ray scattering studies during the formation of polymer/silica nanocomposite particles in aqueous solution." Chemical Science 12, no. 42 (2021): 14288–300. http://dx.doi.org/10.1039/d1sc03353k.

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SAXS is used to study the formation of polymer/silica nanocomposite particles prepared by surfactant-free aqueous emulsion polymerization of 2,2,2-trifluoroethyl methacrylate in the presence of silica nanoparticles using a azo initiator at 60 °C.
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Darbandi, Fatemeh, Azadeh Mousavi, Tayebe Bagheri Lotfabad, Amir Heydarinasab, and Soheila Yaghmaei. "Azo dye removal via surfactant-assisted polyvinylidene fluoride membrane." Environmental Health Engineering and Management 8, no. 1 (February 15, 2021): 25–32. http://dx.doi.org/10.34172/ehem.2021.04.

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Background: Recently, concerns have been raised regarding the environmental and public health safety of azo dyes, the most widely used synthetic dyes. The membrane technique has been introduced as one of the efficient methods for dye removal treatments. Polyvinylidene fluoride (PVDF) membrane manipulated by surfactants was studied for removal of the azo dye, carmoisine. Methods: PVDF membrane was prepared via non-solvent-induced phase separation (NIPS) and used to remove the azo dye, carmoisine. Three nonionic surfactants including Tween 20, Tween 60, and Tween 80 were used individually as additives in casting solutions to improve PVDF membrane properties. Results: Fourier-transform infrared spectroscopy (FTIR) demonstrated the presence of functional groups of carbonyl (C=O) and hydroxyl (OH), assigned to Tween molecules, in the membrane chemical structure. All Tween species caused a decrease in the surface hydrophobicity of PVDF membranes illustrated by the reduced contact angles. Each Tween at a 2% concentration in the dope solution led to an increase in the pore-size of PVDF membranes, which was estimated by scanning electron microscopy (SEM). However, this impact was reversed at Tween concentrations of 4%. Membranes were assessed for dye removal efficiency and permeate flux in a cross-flow system. Permeability of PVDF membranes improved (~78%) with adding Tween 80 at a concentration of 2%. Tween 60 at a 2% concentration resulted in a ~45% increase in dye removal efficiency of PVDF membranes. And, atomic force microscopy (AFM) showed that Tween 60 increased membrane surface roughness. Conclusion: Surfactant-mediated changes in the surface properties of PVDF membrane improved dye removal efficacy.
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Ghoreishi, Sayed Mehdi, Mohsen Behpour, and Mehdi Shabani-Nooshabadi. "Interaction of anionic azo dye and TTAB: cationic surfactant." Journal of the Brazilian Chemical Society 20, no. 3 (2009): 460–65. http://dx.doi.org/10.1590/s0103-50532009000300008.

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Favaro, Yvette L., and Vincent C. Reinsborough. "Micellar catalysis in mixed anionic/cationic surfactant systems." Canadian Journal of Chemistry 72, no. 12 (December 1, 1994): 2443–46. http://dx.doi.org/10.1139/v94-310.

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Dye solubility and stopped-flow kinetic studies were conducted in sodium dodecylsulfate/dodecyltrimethylammonium bromide and sodium dodecylsulfate/decyltrimethylammonium bromide micellar solutions with excess anionic surfactant. The enhanced rate in the presence of anionic micelles of the Ni2+(aq)/pyridine-2-azo-p-dimethylaniline (PADA) complexation reaction was used as a probe of the mixed micellar situation. PADA solubilities and the kinetic parameters derived through the Robinson model for micellar catalysis were consistent with a complete incorporation of the cationic surfactant into the sodium dodecylsulfate micelles.
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Wu, Yaming, Yuhai Liu, Jianxiang Chen, and Runmiao Yang. "Synthesis, Self-Assembly and Photoresponsive Behavior of Liquid Crystals Based on Azobenzene." Crystals 11, no. 12 (December 14, 2021): 1560. http://dx.doi.org/10.3390/cryst11121560.

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A new amphiphilic surfactant (C4-Azo-C5-HDA) was formed by liquid crystals (LCs) based on azobenzene, whose structures were characterized by 1H-NMR spectroscopy. The reversible hydrogelation upon changes in temperature and light exposure was also studied. Under the irradiation of UV light, the trans-isomer of C4-Azo-C5-HDA rapidly photoisomerized to the cis-isomer, resulting in rapid disruption of the gel. The thermotropic liquid crystal behavior of the gelator was investigated via Differential Scanning Calorimetry (DSC) and Polarizing Optical Microscopy (POM). The biocompatibility experiment of multi-stimulus response of the liquid crystal provides a potential driving force for the development of biomaterials.
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Armagan, Bulent, Orhan Ozdemir, Mustafa Turan, and Mehmet S. Çelik. "Adsorption of Negatively Charged Azo Dyes onto Surfactant-Modified Sepiolite." Journal of Environmental Engineering 129, no. 8 (August 2003): 709–15. http://dx.doi.org/10.1061/(asce)0733-9372(2003)129:8(709).

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Al- Mammar, Dunya Edan. "Characteristics of azo-dye onto surfactant modified chromium contained leather waste." IOSR Journal of Applied Chemistry 7, no. 2 (2014): 83–92. http://dx.doi.org/10.9790/5736-07218392.

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Dissertations / Theses on the topic "Azo-surfactant"

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Liu, Yazhao. "Photo-responsive systems in aqueous solution : from model polyelectrolytes to polyelectrolyte-surfactant complexes." Thesis, Strasbourg, 2021. http://www.theses.fr/2021STRAE007.

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Cette thèse vise à concevoir, synthétiser et étudier des systèmes photo-stimulables modèles en solution aqueuse formés à partir de polyélectrolytes (PEs) et de tensioactifs. La photosensibilité est liée à la présence de chromophores azobenzène (Azo) qui subissent une isomérisation trans → cis sous irradiation UV. Nous avons considéré dans un premier temps un PE hydrophile sur lequel nous avons greffé des groupements Azo. Ce système forme de agrégats globulaires en solution en raison du collapse des chaînes et des associations intermoléculaires. La taille des agrégats varie sous irradiation UV. Elle dépend également de la masse molaire des PEs et du taux de greffage des groupements Azo. Nous avons considéré dans un second temps des tensioactifs dans lesquels des groupements Azo ont été introduits (Azo-tensioactifs). Nous avons étudié leur complexation avec des PEs de charge opposée. Ces systèmes s’organisent en colliers de perles. Les polyions décorent les micelles et pénètrent à l’intérieur de celles-ci (co-micellisation). Sous irradiation UV, la taille des perles diminue sans vraiment modifier l’organisation des complexes. Nous nous sommes enfin intéressés à l’auto-assemblage d’Azo-tensioactifs et de co-tensioactifs. Ce mélange conduit à la formation des micelles allongées et à la création d’un gel. Sous irradiation UV, on observe une transition gel - fluide. L’origine ce phénomène est lié à un changement morphologique des agrégats micellaires (micelles allongées - micelles globulaires)
This thesis aims at designing, synthesizing and characterizing model photo-responsive systems in aqueous solution. These systems are based on polyelectrolytes (PEs) and surfactants. The photo-sensitivity arises from the presence of azobenzene (Azo) groups that undergo a transition from a trans to a cis isomer. We first considered a hydrophilic PE on which we grafted Azo groups. This system forms globular aggregates in solution due to chains collapse and intermolecular associations. The size of the aggregates varies under UV irradiation. It also depends on the molar mass of the PEs and the Azo content. We then considered surfactants in which Azo groups have been introduced (Azo-surfactants). We studied their complexation with oppositely charged PEs. These systems show a pearl necklace organization. The PEs decorate the micelles and penetrate inside (co-micellisation). Under UV irradiation, the size of the pearls decreases without really modifying the general organization of the complexes. Finally, we were interested in the self-assembly of Azo-surfactants and co-surfactants. This mixture leads to the formation of wormlike micelles and the creation of a gel. Under UV irradiation, a gel - fluid transition is observed. The origin of this phenomenon is linked to a morphological transition of the micellar aggregates (wormlike micelles - globular micelles)
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Hung, Po-Ning, and 洪伯寧. "Nonionic surfactant and phytohormones for enhancing phytoremediation removal potential of azo dyes from aqueous solution." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/f6g83u.

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Conference papers on the topic "Azo-surfactant"

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Zhang, Gongjian, Hiroaki Takahashi, Lili Wang, Junichi Yoshida, Soichi Kobayashi, Suguru Horinouchi, and Naoya Ogata. "Nonlinear optical materials derived from biopolymer (DNA)-surfactant azo dye complex." In Asia-Pacific Optical and Wireless Communications 2002, edited by Constance J. Chang-Hasnain, YuXing Xia, and Kenichi Iga. SPIE, 2002. http://dx.doi.org/10.1117/12.481027.

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You might also be interested in the extended bibliographies on the topic 'Azo-surfactant' for particular source types:
Journal articles
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