Creation of Superhydrophobic Coatings Based on MWCNTs Xerogel

Есеев, М. К.; Goshev, A. A.; Kapustin, S. N.; Tsykareva, Yuliana

doi:10.3390/nano9111584

Cited by 24 publications

(13 citation statements)

References 29 publications

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“…This behavior is attributed to the hydrophobic nature of MWCNTs which demolish the water penetration into the polymer matrix. 66 The swelling behavior of the composite also displayed the same trend (see Figure 8b). The PAA membrane showed a swelling ratio of 313%, indicating an excellent wet dimensional stability.…”

Section: Water Absorptivity Swelling Behavior and Mechanical Propsupporting

confidence: 56%

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Mechanically stable membranes of polyacrylic acid‐grafted chitosan‐functionalized carbon nanotubes with remarkable water storage capacity in sandy soils

Alsohaimi

Hafez

Berber

2020

J of Applied Polymer Sci

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Polyacrylic acid (PAA) is one of the most exciting hydrophilic polymers for water control and conservation; however, it suffers from poor mechanical properties during the agricultural applications. For that purpose a series of PAA-based multiwalled carbon nanotubes (MWCNTs) membranes have synthesized via a grafting process of MWCNTs using chitosan (CS) polymer as a binder. The fabricated membranes have spectroscopically characterized by different techniques to confirm the composite structure. The MWCNTs content into the PAA membranes has played a pronounced effect on water absorptivity, swelling behavior, and mechanical properties. PAA membrane has showed a fourfold increase in yield-stress by the addition of 3 wt% PAA/CS/MWCNTs, while preserving a 91% of water absorptivity of PAA membrane. The soil applications of the PAA/CS/MWCNTs membranes have showed remarkable improvements in soil moisture content compared to the PAA membrane. This study provides a promising pathway for future field applications, especially in arid lands.

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Section: Water Absorptivity Swelling Behavior and Mechanical Propsupporting

confidence: 56%

“…The further increase of MWCNTs content showed a sharp decrease in water absorption, reaching 60 g/g for PAA9 membrane. This behavior is attributed to the hydrophobic nature of MWCNTs which demolish the water penetration into the polymer matrix 66 . The swelling behavior of the composite also displayed the same trend (see Figure 8b).…”

Section: Resultsmentioning

confidence: 54%

Mechanically stable membranes of polyacrylic acid‐grafted chitosan‐functionalized carbon nanotubes with remarkable water storage capacity in sandy soils

Alsohaimi

Hafez

Berber

2020

J of Applied Polymer Sci

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“…This area of research is attracting considerable interest within the scientific community. It should enable a deeper understanding of the fundamental processes occurring in atoms and molecules [ 9 ], and greatly enhance the study of biomolecules, nanosystems, and complex polyatomic structures [ 10 ], as well as of various dynamic processes [ 11 , 12 ]. Furthermore, these new techniques enable the stages of a chemical reaction, and the generation of higher harmonics [ 3 , 4 ] to be traced.…”

Section: Introductionmentioning

confidence: 99%

Scattering of Ultrashort X-ray Pulses by Various Nanosystems

2020

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Currently, the study of the scattering of ultrashort X-ray pulses (USPs) by various objects is an urgent task, in connection with the creation of powerful sources of USP generation. In this paper, the theory of the scattering of attosecond pulses by polyatomic structures is developed taking into account the magnetic component of USPs. It is shown that the scattering spectra depend not only on the structure of the target, but also on other characteristics of USPs. Results are presented of the calculation of the scattering spectra on various nanosystems, such as rings, groups of rings, carbon nanotubes (CNTs), and groups of co-directed CNTs (forest CNTs). The calculation results are presented in an analytical form, which allows a general analysis of the expressions. It was found that taking the magnetic component of the momentum into the scattering spectra into account leads to the generation of the second harmonic. In this case, the spectra have characteristic features and differ from the scattering spectra at the carrier frequency, which can complement ultra-high-resolution X-ray analysis. It is shown that the scattering spectra of some structures, for example, forest CNTs, have a strictly specified radiation direction and such material in the field of such USPs is non-reflective (completely black).

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“…Рассматривалось два пути получения покрытия. Первый подход предполагал использование методики [5], предложенной для получения сверхгидрофобного покрытия из углеродных нанотрубок. Преимущество использования УЛС перед нанотрубками заключается в их меньшей себестоимости и доступности их поверхности за счет их квазисферической формы, позволяющей создавать более упорядоченные наноструктуры.…”

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“…Полученный поро-шок укладывался на поверхность защищаемого образца, покрытую двусторонним скотчем, после чего агломераты УЛС растирались таким же образцом до создания однородного покрытия. Второй путь предполагал нанесение покрытия без использования клейкой прослойки, что значительно более технологично, чем метод, предложенный нами в работе [5] [5,7], в которых утверждается, что более полярные растворители способствуют получению поверхности с более развитой морфологией и усиливают эффект лотоса. Причиной различий является малое аспектное соотношение самих наночастиц УЛС: в отличие от нанотрубок они не могут переплетаться между собой, формируя тем самым специфический нанорельеф в виде глобул [7].…”

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