Surface properties of CNTs and their interaction with silica

Sobolkina, Anastasia; Mechtcherine, Viktor; Bellmann, Cornelia; Khavrus, Vyacheslav O.; Oswald, Steffen; Hampel, Silke; Leonhardt, A.

doi:10.1016/j.jcis.2013.09.033

Cited by 39 publications

(26 citation statements)

References 54 publications

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“…As can be seen, along with expected carbon atoms, the XPS detected the presence of heteroatoms, such as nitrogen and/ or oxygen, on the CNT surfaces. This indicates that the CNTs are modified with different surface functionalities acting as active centres on their surfaces [3]. The highest concentration of the heteroatoms was detected on the CH 3 CN-CNT surface, which clarifies its high polarity observed in the capillary penetration experiments.…”

Section: Resultssupporting

confidence: 61%

Surface Properties of Carbon Nanotubes and Their Role in Interactions with Silica

Sobolkina

Mechtcherine

Bellmann

et al. 2015

Nanotechnology in Construction

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Different approaches, including determination of the surface tension via capillary penetration measurements and characterization of the surface chemical composition by means of X-ray photoelectron spectroscopy (XPS), were applied to reveal the surface properties of various CNT types produced from acetonitrile (CH 3 CN), cyclohexane (C 6 H 12 ) and methane (CH 4 ). Significant differences were found in the polarity of the CNT surfaces depending on the used precursors. The surface tension of the CNTs increases by utilization of carbon sources in the following order: cyclohexane, methane, acetonitrile. Using XPS analysis a comparatively high contents of nitrogen and oxygen atoms were detected on the surface of the CH 3 CN-CNTs. Based on the results of the mass spectrometry, the strong hydrophobic character observed for the C 6 H 12 -CNTs is assumed to originate from polycyclic aromatic hydrocarbons deposited on the nanotubes' surface during synthesis. The investigation of the deposition of silica on the CNTs by a sol-gel method showed that the polar surface of the CH 3 CN-CNTs provided the most favorable condition for the heterogeneous precipitation of silica. In contrast, no precipitation of silica was observed on the hydrophobic C 6 H 12 -CNTs.

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Section: Resultssupporting

confidence: 61%

Surface Properties of Carbon Nanotubes and Their Role in Interactions with Silica

Sobolkina

Mechtcherine

Bellmann

et al. 2015

Nanotechnology in Construction

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“…Sobolkina et al [15] set that the increase of the strength characteristics of products occurs due to the synergistic effect of the interaction of nanoparticles in a complex additive with high surface energy and acting as crystallization centers on the surface of which there is intensive formation of ordered crystals of calcium sulfate dehydrate. The decrease in strength, the concentration of nanotubes increasing, may be the evidence of the lack of a binder required for modifying the structure of GCPB.…”

Section: Discussing the Resultsmentioning

confidence: 99%

Role of Polyfunctional Admixture Based on Silica Fume and Carbon Nanotubes in Forming the Structure of Gypsum Cement Composition

Izryadnova

Yakovlev

Nurieva

et al. 2015

Procedia Engineering

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One of the topical areas of regulating the structure of gypsum cement compositions is modifying the morphology with ultrafine and nanodisperse systems. The study has analyzed the possibility of changing the structure and properties of new formations of gypsum cement pozzolanic matrix by adding multifunctional admixture based on silica fume and multi-walled carbon nanotubes (MWCNTs) dispersed in a surfactant medium. The optimum content of complex admixture has been determined as 0.006% of MWCNTs and 10% volume content of silica fume as part of modified gypsum cement pozzolanic binder (GCPB) providing the increase of compressive strength by 55% and water resistance by 32%. Studying the structure of modified GCPB by means of physico-chemical analysis (scanning electron microscopy, infrared-spectral analysis and differential scanning calorimetry) has proved the improvement of physical and mechanical properties due to changes in mineralogical composition of new formations in hardening composition and morphology of the forming crystal hydrates in the structure of modified gypsum cement pozzolanic matrix. At the same time, it is noted that gypsum crystalline hydrates are coated with calcium silicate hydrates compacting the structure of the composition and increasing the total contact surface of the new formations. At the same time calcium silicate hydrates prevent water from the surface of crystals of calcium sulfate dihydrate, thereby increasing the water resistance of the composition.

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“…The doping process is commonly done in situ, which can be easily realized using the CVD method [16]. Moreover, nitrogen doping can also change the surface properties [17][18][19][20], and thus, enhances the dispersibility of CNT in water-based solutions. In general, pristine MWCNT exhibit a hydrophobic surface [17].…”

Section: Introductionmentioning

confidence: 99%

“…Moreover, nitrogen doping can also change the surface properties [17][18][19][20], and thus, enhances the dispersibility of CNT in water-based solutions. In general, pristine MWCNT exhibit a hydrophobic surface [17]. But when doped with nitrogen, the CNT surface has, compared to the undoped ones, more chemically activesites, which facilitate electron transfer and enhance a surface polarity of the CNT,and thus, a higher wettability [14,17].…”

Section: Introductionmentioning

confidence: 99%

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Investigation of the surface properties of different highly aligned N-MWCNT carpets

Eckert

Haubold

Oswald

et al. 2019

Carbon

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We investigated the physicochemical surface properties of different highly aligned nitrogendoped multi-walled carbon nanotube (N-MWCNT) carpets, synthesized using toluene/pyrazine, toluene/benzylamine and acetonitrile via a sublimation-based chemical vapor deposition (SCVD) method at 760 °C. The surfaces of the N-MWCNT carpets synthesized using toluene/pyrazine and toluene/benzylamine were very hydrophobic. In contrast, we observed a complete wetting of the N-MWCNT carpets synthesized using acetonitrile. The difference in the wetting behavior of these N-MWCNT carpets is the main focus in this study and was not investigated before. Here, we show that not only the presence or concentration of nitrogen inside the carbon lattice, but especially it's kind of incorporation havean important influence on the surface polarity.

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Surface properties of CNTs and their interaction with silica

Cited by 39 publications

References 54 publications

Surface Properties of Carbon Nanotubes and Their Role in Interactions with Silica

Surface Properties of Carbon Nanotubes and Their Role in Interactions with Silica

Role of Polyfunctional Admixture Based on Silica Fume and Carbon Nanotubes in Forming the Structure of Gypsum Cement Composition

Investigation of the surface properties of different highly aligned N-MWCNT carpets

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