IR-study of thermotropic phase transitions in cetyltrimethylammonium bromide powder and film

Bezrodna, T.; Puchkovska, G.; Styopkin, V. I.; Baran, J.; Drozd, M.; Danchuk, V. D.; Kravchuk, A. P.

doi:10.1016/j.molstruc.2010.03.018

Cited by 20 publications

(20 citation statements)

References 20 publications

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“…Finally, the C16TMABr melted, and no reflections were detected ( Figure 8 ). The increase in the basal spacing was related to a solid-solid transition phase at 103 °C, as deduced from the differential scanning calorimetry DSC study [ 53 ].…”

Section: Resultsmentioning

confidence: 99%

Application of Organo-Magadiites for the Removal of Eosin Dye from Aqueous Solutions: Thermal Treatment and Regeneration

et al. 2018

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Na-magadiite exchanged with cetyl-trimethylammonium cations provided organophilic silicate materials that allowed for the effective removal of the acidic dye “eosin”. The organic cations were intercalated into the interlayer spacing of the layered silicate via an exchange reaction between the organic cations from their bromide salt and the solid Na-magadiite at room temperature. Different techniques were used to characterize the effect of the initial concentration of the surfactant on the structure of the organo-magadiites. The C, H, and N analysis indicated that a maximum of organic cations of 0.97 mmol/g was achieved and was accompanied by an expansion of the basal spacing of 3.08 nm, with a tilted angle of 59° to the silicate layers. The conformation of the organic surfactants was probed using solid-state 13C, finding mainly the trans conformation similar to that of the starting cetyl trimethylammonium bromide salt (C16TMABr). Thermal gravimetric analysis was carried out to study the thermal stability of the resulting organo-magadiites. The intercalated surfactants started to decompose at 200 °C, with a mass loss percentage of 8% to 25%, depending on the initial loading of the surfactant, and was accompanied by a decrease of the basal spacing from 3.16 nm to 2.51 nm, as deduced from the in situ X-ray diffraction studies. At temperatures below 220 °C, an expansion of the basal spacing from 3.15 to 3.34 nm occurred. These materials were used as a removal agent for the anionic dye eosin. The maximum amount of the dye removed was related to the organic cation content and to the initial concentration of eosin, with an improvement from 2.5 mg/g to 80.65 mg/g. This value decreased when the organo-magadiite was preheated at temperatures above 200 °C. The regeneration tests indicated that an 85% removal efficiency was maintained after six cycles of use for the organo-magadiite using Ci of 200 mg/L.

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Section: Resultsmentioning

confidence: 99%

Application of Organo-Magadiites for the Removal of Eosin Dye from Aqueous Solutions: Thermal Treatment and Regeneration

et al. 2018

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“…The increase in the basal spacing was related to a solid-solid transition phase at 103 °C, as deduced from the DSC study [50]. Figure S3).…”

Section: In Situ Powder Xrd Studiesmentioning

confidence: 60%

Application of Organo-Magadiites for the Removal of Eosin Dye from Aqueous Solutions: Thermal Treatment and Regeneration

Kooli¹,

Liu²,

Abouddi³

et al. 2018

Preprint

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Na-magadiite exchanged with cetyl-trimethylammonium cations provided organophilic silicate materials that allowed the effective removal of the acidic dye "eosin". The organic cations were intercalated into the interlayer spacing of the layered silicate via an exchange reaction between the organic cations from their bromide salt and the solid Na-magadiite at room temperature. Different techniques were used to characterize the effect of the initial concentration of the surfactant on the structure of the organo-magadiites. The C, H, N analysis indicated that a maximum of 2 organic cations of 1.03 mmol/g was achieved at initial concentrations higher than 0.25 mmol/g and was accompanied by an expansion of the basal spacing of 3.15 nm, with a tilted angle of 64.5° to the silicate layers. The conformation of the organic surfactants was probed using solid-state 13 C, finding mainly the trans conformation similar to that of the starting cetyl trimethylammonium bromide salt (C16TMABr).Thermal gravimetric analysis was carried out to study the thermal stability of the resulting organo-magadiites. The intercalated surfactants started to decompose at 200 °C, with a mass loss percentage of 8 % to 25 %, depending on the initial loading of the surfactant, and was accompanied by a decrease of the basal spacing from 3.20 nm to 2.51 nm, as deduced from the in situ X-ray diffraction studies. At temperatures below 220 °C, an expansion of the basal spacing from 3.15 to 3.35 nm occurred.These materials were used as a removal agent for the anionic dye "eosin". The maximum amount of the dye removed was related to the organic cation content and to the initial concentration of eosin, with an improvement from 2.5 mg/g to 98 mg/g. This value decreased when the organo-magadiite was preheated at temperatures above 200 °C. The regeneration tests indicated that an 85 % removal efficiency was maintained after 6 cycles of use for the organo-magadiites.

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“…The peak at 904 cm −1 is ascribed to the C―N + stretching vibrations. The band at 1487 cm −1 characterizes movements of an ionic hydrophilic part of the CTAB molecules (N + ―(CH 3 ) 3 vibrations) . These peaks are the characteristic peaks of CTAB.…”

Section: Resultsmentioning

confidence: 99%

“…PAA‐ g ‐CTAB superabsorbent polymer was synthesized by modifying the procedure from references . A mixed solution of CTAB and AA monomer was made by vigorously agitating these components in distilled water.…”

Section: Methodsmentioning

confidence: 99%

Alcohol elastomer based on superabsorbents

Tang

Luo

et al. 2011

Polymers for Advanced Techs

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A microporous superabsorbent of poly(acrylic acid‐g‐cetyltrimethylammonium bromide) (PAA‐g‐CTAB) is synthesized by aqueous polymerization method. With the use of the superabsorbent as a host backbone, a large amount of alcohol is absorbed inside the micropores of PAA‐g‐CTAB to form an alcohol elastomer with an alcohol absorbency of 32 g/g. As a new kind of quasi‐solid‐state fuel, the alcohol elastomer is safe, low cost, and easy to use. The alcohol absorbency of the superabsorbent and the combustion properties of the alcohol elastomer can be adjusted by tuning the polymerization reaction conditions. The flame reactions in the alcohol elastomer arouse more interest for the alcohol elastomer. Copyright © 2011 John Wiley & Sons, Ltd.

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IR-study of thermotropic phase transitions in cetyltrimethylammonium bromide powder and film

Cited by 20 publications

References 20 publications

Application of Organo-Magadiites for the Removal of Eosin Dye from Aqueous Solutions: Thermal Treatment and Regeneration

Application of Organo-Magadiites for the Removal of Eosin Dye from Aqueous Solutions: Thermal Treatment and Regeneration

Application of Organo-Magadiites for the Removal of Eosin Dye from Aqueous Solutions: Thermal Treatment and Regeneration

Alcohol elastomer based on superabsorbents

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