Model and mechanism of carbon nanotube stabilization with plasticizer

Самченко, Светлана; Kozlova, I. V.; Zemskova, Оlga

doi:10.1051/matecconf/201819303050

Cited by 9 publications

(5 citation statements)

References 14 publications

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“…The tap water (pH = 7.6) and the tap water with polycarboxylate resin ester superplasticizer have been used as the disperse phases; their general formula is: (2) UBFGS suspensions have been prepared using the mechanical stirring by magnetic mixer for 5 min. Ready-to-use ultradisperse slag suspensions with the corresponding concentrations have been poured into the 100 cm 3 cylinders in order to observe the sedimentation, while the time period from the suspension preparation beginning to the particles intensive sedimentation completion, disperse phase clarification completion, and reaching absolutely clear disperse phase have been measured.…”

Section: Methodsmentioning

confidence: 99%

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Ultradisperse slag suspensions aggregative and sedimentative stability

2017

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Abstract. Ultradisperse slag suspensions in aqueous and water-polymer phases have been studied. Disperse systems main stability factors applied to the ultradisperse slag have been considered. Chemical equations for the processes running in the aqueous and water-polymer disperse phases with slag particles have been provided. Graphical dependencies confirming the increase of the aggregative stability and sedimentative stability of the ultradisperse slag suspensions have been illustrated, and the processes causing such an increase have been disclosed.

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Section: Methodsmentioning

confidence: 99%

“…The studies of the cement stone containing the carbon nanotubes (CNT) stabilized suspension obtained by acoustic cavitation method demonstrate high performance [1][2][3][4], which allows to consider the CNT concentrate as one of the components for the mortar preparation in structural and thermally insulated aerated concrete production.…”

Section: Introductionmentioning

confidence: 99%

Ultradisperse slag suspensions aggregative and sedimentative stability

2017

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“…CNTs have not only unique technical characteristics, but are also interesting from the standpoint of chemistry and physical chemistry. This is due to the ability of CNTs to attach a variety of radicals to their surface, which can serve as catalytic centers or nuclei for various chemical transformations [8]. It has been experimentally shown [9,10] that during the oxidation of CNTs, their surface is covered with hydrocarbon radicals: -СООН, -СО, -СОН.…”

Section: Introductionmentioning

confidence: 99%

“…However, a negative point is also possible associated with the agglomeration of functionalized CNTs in the spaces between large cement particles. It causes deterioration of mechanical properties [8,11]. Agglomeration of CNTs can be minimized if they are dispersed by various methods [12,13].…”

Section: Introductionmentioning

confidence: 99%

Relevance and Efficiency of Using Nanosized Particles in Structuring Cement Pastes

Kozlova

Самченко

Zemskova

et al. 2022

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The relevance of the use of nanosized particles in the structuring of cement pastes is due to the ability at the micro level to control the processes occurring during the hardening of cement. And it also provides the ability to purposefully control the composition of hydrated neoplasms. Plasticizer-stabilized aqueous suspensions of nanosized particles of non-hydraulically active materials in a cement matrix cause forced crystallization of hydrated neoplasms from a supersaturated liquid phase. And they act as seeds introduced from the outside, on the surface of which neoplasms are concentrated, that subsequently combine into conglomerates that make up the structure of a cement stone. The formation of the structure of the cement matrix occurs without the formation of large the portlandite fields, which are typical for no additive portland cement. The structure of a cement stone with nanosized particles is represented by poorly crystallized flaky calcium hydrosilicates. It was found that the degree of hydration of cements with suspensions of nanoparticles is 15-18% higher. The efficiency of using nanosized particles in structuring cement pastes is giving the cement paste mobility in the initial period of hydration and the possibility of plasticizing it without blocking the surface of cement particles with surfactants. On the other hand, it makes it possible to obtain dense and durable structures of a cement matrix with improved physical and mechanical characteristics. The porosity of cements with suspensions is lower on 15 - 20%, and after 28 days of hardening it is lower on 20 - 35% than that of non-additive cement. And the strength of the samples after 24 hours increased 1.5 - 1.8 times (from 19.5 to 27 - 34 MPa), at the brand age by 15 - 24% (from 64 to 75 - 80 MPa)

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“…To ensure uniform distribution of slag particles in the volume of the cement matrix, it is proposed to introduce FGS as a suspension into the cement instead of mixing water [16][17][18]. The papers [19][20][21][22][23][24][25] carried out studies on the establishment of aggregative and sedimentation stability of dispersions of various substances of the nanoscale series: carbon nanotubes, europium oxohydroxide hydrosol, γ-Al2O3 sol, etc. The results of the studies showed that the establishment of aggregative and sedimentation stability of dispersions and the use of methods of homogenization and stabilization contribute to the uniform distribution of particles in the volume of the cement matrix and the production of products with enhanced performance properties.…”

Section: Introductionmentioning

confidence: 99%

Efficiency of stabilization of slag suspensions by polycarboxylate

et al. 2019

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The paper describes the method of stabilization of slag suspensions prepared on the basis of finely ground slag (FGS) with a predominant particle size of 1-7 μm, a plasticizer based on polycarboxylate (polycarboxylate). In suspension, FGS particles form two types of micelles with negative and positive surface charges. It has been established that stabilization with polycarboxylate, which is an anionic long-chain surfactant, affects slag particles with a positive surface charge. The formation of strong and elastic gel-like films on the surface of FGS leads to an increase in the structural and mechanical factor of aggregative stability of slag suspensions. Thus, the stabilization of slag particles by polycarboxylate is ensured by electrostatic, structural and mechanical factors of aggregative stability. It was established experimentally that the introduction of polycarboxylate into the aqueous dispersion medium increases the aggregative and sedimentation stability of slag suspensions. In the first period of particle sedimentation, on average, stability of slag suspensions is increased by 36 times, in the second period - 19 times, in the third period - 4 times. To ensure stability of slag suspensions, the protective number and the optimal concentration of the polycarboxylate are determined. The protective number of the suspension was 0,016 g/l; the optimal concentration of polycarboxylate - 4 g/l.

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Model and mechanism of carbon nanotube stabilization with plasticizer

Cited by 9 publications

References 14 publications

Ultradisperse slag suspensions aggregative and sedimentative stability

Ultradisperse slag suspensions aggregative and sedimentative stability

Relevance and Efficiency of Using Nanosized Particles in Structuring Cement Pastes

Efficiency of stabilization of slag suspensions by polycarboxylate

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