KFU. Card publication. Reciprocal effects of multi-walled carbon nanotubes and oppositely charged surfactants in bulk water and at interfaces

KAZAN
FEDERAL UNIVERSITY

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RECIPROCAL EFFECTS OF MULTI-WALLED CARBON NANOTUBES AND OPPOSITELY CHARGED SURFACTANTS IN BULK WATER AND AT INTERFACES

Form of presentation

Articles in international journals and collections

Year of publication

2020

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Authors, employees of KFU

Zuev Yuriy Fedorovich, author

Kusova Aleksandra Mikhaylovna, author

Salnikov Vadim Vladimirovich, author

Turanov Aleksandr Nikolaevich, author

Authors, students KFU

Iskhakova Alina Kamilevna, author

Bibliographic description in the original language

Zueva O.S., Kusova A.M., Makarova A.O., Turanov A., Iskhakovan A. Salnikov V.V., Zuev Y.F. Reciprocal effects of multi-walled carbon nanotubes and oppositely charged surfactants in bulk water and at interfaces. Colloids and Surfaces A, Volume 603, 20 October 2020, 125296. DOI: 10.1016/j.colsurfa.

Annotation

In this work we made the complementary use of nuclear magnetic resonance spectroscopy, dynamic light scattering, electric conductivity and surface tension methods to study the micellization of cationic surfactants cetyl trimethylammonium bromide (CTAB) and dodecyltrimethylammonium bromide (DTAB), as well as anionic surfactant sodium dodecyl sulfate (SDS) in the presence of multi-walled carbon nanotubes (CNT). It was shown that the CNTs is eﬀectively dispersed in water medium due to the adsorption of surfactant ions at CNT surface. The NMR spectral analysis (chemical shifts and line broadening) speciﬁed that surfactants interact with CNTs surface both by alkyl chains and by charged head groups. For cationic CTAB and DTAB this interaction occurs mainly through methylene (CH 2 ) n groups of alkyl radicals, at the same time, the anionic SDS interacts with the CNTs surface by terminal methyl groups (CH 3 ). Interaction speciﬁcity of cationic and anionic surfactants leads to their diﬀerent structural organization to CNT surface. Experimental observations make it possible to propose the model where the attraction of cationic DTAB and CTAB positively charged head groups with negatively charged CNT surface results to the orientation of cationic surfactants along CNT surface. In contrast to positively charged DTAB and CTAB the repulsion of SDS with negatively charged head group from CNT surface and contacted SDS terminal groups results in the normal orientation of anionic surfactant to CNT surface. The consistency of proposed orientation model arrived from conductivity study of surfactant-CNT dispersions. According to con- ductivity data, the non-micellized cationic surfactants follow complete dissociation in the presence of CNT no matter are they free or bound to CNT. On the contrary the absence of complete dissociation of anionic surfactant in the pre-micellar systems may be the result of SDS ordering on CNT surface and forming the charged surface with double electric layer binding the portion of counter-ions.

Keywords

Multi-walled carbon nanotubes (CNTs), Water dispersions, Cationic and anionic surfactants, Adsorption, Superﬁcial ordering

The name of the journal

Colloids and Surfaces A: Physicochemical and Engineering Aspects

URL

https://doi.org/10.1016/j.colsurfa.2020.125296

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=239185&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Zuev Yuriy Fedorovich	ru_RU
dc.contributor.author	Kusova Aleksandra Mikhaylovna	ru_RU
dc.contributor.author	Salnikov Vadim Vladimirovich	ru_RU
dc.contributor.author	Turanov Aleksandr Nikolaevich	ru_RU
dc.contributor.author	Iskhakova Alina Kamilevna	ru_RU
dc.date.accessioned	2020-01-01T00:00:00Z	ru_RU
dc.date.available	2020-01-01T00:00:00Z	ru_RU
dc.date.issued	2020	ru_RU
dc.identifier.citation	Zueva O.S., Kusova A.M., Makarova A.O., Turanov A., Iskhakovan A. Salnikov V.V., Zuev Y.F. Reciprocal effects of multi-walled carbon nanotubes and oppositely charged surfactants in bulk water and at interfaces. Colloids and Surfaces A, Volume 603, 20 October 2020, 125296. DOI: 10.1016/j.colsurfa.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=239185&p_lang=2	ru_RU
dc.description.abstract	Colloids and Surfaces A: Physicochemical and Engineering Aspects	ru_RU
dc.description.abstract	In this work we made the complementary use of nuclear magnetic resonance spectroscopy, dynamic light scattering, electric conductivity and surface tension methods to study the micellization of cationic surfactants cetyl trimethylammonium bromide (CTAB) and dodecyltrimethylammonium bromide (DTAB), as well as anionic surfactant sodium dodecyl sulfate (SDS) in the presence of multi-walled carbon nanotubes (CNT). It was shown that the CNTs is eﬀectively dispersed in water medium due to the adsorption of surfactant ions at CNT surface. The NMR spectral analysis (chemical shifts and line broadening) speciﬁed that surfactants interact with CNTs surface both by alkyl chains and by charged head groups. For cationic CTAB and DTAB this interaction occurs mainly through methylene (CH 2 ) n groups of alkyl radicals, at the same time, the anionic SDS interacts with the CNTs surface by terminal methyl groups (CH 3 ). Interaction speciﬁcity of cationic and anionic surfactants leads to their diﬀerent structural organization to CNT surface. Experimental observations make it possible to propose the model where the attraction of cationic DTAB and CTAB positively charged head groups with negatively charged CNT surface results to the orientation of cationic surfactants along CNT surface. In contrast to positively charged DTAB and CTAB the repulsion of SDS with negatively charged head group from CNT surface and contacted SDS terminal groups results in the normal orientation of anionic surfactant to CNT surface. The consistency of proposed orientation model arrived from conductivity study of surfactant-CNT dispersions. According to con- ductivity data, the non-micellized cationic surfactants follow complete dissociation in the presence of CNT no matter are they free or bound to CNT. On the contrary the absence of complete dissociation of anionic surfactant in the pre-micellar systems may be the result of SDS ordering on CNT surface and forming the charged surface with double electric layer binding the portion of counter-ions.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject	Multi-walled carbon nanotubes (CNTs)	ru_RU
dc.subject	Water dispersions	ru_RU
dc.subject	Cationic and anionic surfactants	ru_RU
dc.subject	Adsorption	ru_RU
dc.subject	Superﬁcial ordering	ru_RU
dc.title	Reciprocal effects of multi-walled carbon nanotubes and oppositely charged surfactants in bulk water and at interfaces	ru_RU
dc.type	Articles in international journals and collections	ru_RU