Sulfated Halloysite Nanoscrolls as Superacid Catalysts for Oligomerization of Hexene-1

Krasilin, Andrei A.; Straumal, Elena A.; Yurkova, L. L.; Khrapova, E. K.; Томкович, М. В.; Shunina, I. G.; Васильева, Л. С.; Лермонтов, С. А.; Иванов, В. К.

doi:10.1134/s1070427219090106

Cited by 8 publications

(4 citation statements)

References 47 publications

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“…Eq. (12), taking into account (18) and (11), makes it possible to determine the stiffness of the picoindenter-nanoscroll contact k 1 :…”

Section: Discussionmentioning

confidence: 99%

“…Scrolled structures may also be formed from a thin, unstressed film to compensate the surface energy difference of the top and bottom sides of the film, [4]. Owing to their composition, structure and morphology, phyllosilicate nanoscrolls are considered as promising adsorbents and capsules [5][6][7], catalysts [8][9][10][11][12] and reinforcing components of composite materials [13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

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Young’s modulus of phyllosilicate nanoscrolls measured by the AFM and by the in-situ TEM indentation

Khalisov¹,

Лебедев²,

Poluboyarinov³

et al. 2021

Nanosystems: Phys. Chem. Math.

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“…Eq. (12), taking into account (18) and (11), makes it possible to determine the stiffness of the picoindenter-nanoscroll contact k 1 :…”

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Young’s modulus of phyllosilicate nanoscrolls measured by the AFM and by the in-situ TEM indentation

Khalisov¹,

Лебедев²,

Poluboyarinov³

et al. 2021

Nanosystems: Phys. Chem. Math.

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“…New metallic or oxide phases can also be imposed externally [16]. Some papers were devoted to the modification of the surface of hydrosilicates with acids [17,18] and organic ligands [19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Formation of a 10 A phase with halloysite structure under hydrothermal conditions with varying initial chemical composition

Leonov¹,

Козлов²,

Kirilenko³

et al. 2023

Nanosystems: Phys. Chem. Math.

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We studied the process of obtaining nanostructured halloysite by varying the parameters for creating the initial composition. The initial composition was synthesized by co-hydrolysis of (C 3 H 7 O) 3 Al and (C 2 H 5 O) 4 Si in the C 6 H 14 -NH 3 •H 2 O system. Aluminum hydrosilicate with the composition Al 2 Si 2 O 5 (OH) 4 was synthesized under hydrothermal conditions (220 • C, 2 MPa, 96 h). Particles of plate-like morphology with average length 100 -200 nm and 60 nm thickness were obtained. The PXRD patterns revealed the presence of two phases. Plate-like kaolinites are found. Also we observed the formation of a halloysite-like phase. Studies of synthesized samples by IR spectroscopy and thermal analysis revealed the presence of organic-modified hydrosilicate with phase transition around 412 • C. The resulting phase is promising for studying the processes of adsorption and further exfoliation. KEYWORDS aluminum, hydrosilicates, hydrothermal synthesis, kaolinite, halloysite ACKNOWLEDGEMENTS The research was supported by the President of the Russian Federation grant MK-1962MK- .2021. STEM studies were carried out using the equipment of the JRC PMR IGIC RAS. TEM studies were partially performed in the Joint Research Center 'Materials science and characterization in advanced technology'. The XRPD and IR studies were performed using the equipment of the Engineering Centre of

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“…[42,43] An abundance of hydroxyl groups on the outer and inner surfaces provides many opportunities for their modification by inorganic and organic functional groups for adsorption enhancement [44][45][46] or solid acid catalysis. [47][48][49] Hydrosilicates can also be used as templates and precursors for oxide-oxide and metal-oxide composites for photocatalysis, [50][51][52] hydrogenation, [53][54][55] methane reforming, [56] water-gas shift [56,57] and Fischer-Tropsch [58,59] processes.…”

Section: Introductionmentioning

confidence: 99%

Surface Tension and Shear Strain Contributions to the Mechanical Behavior of Individual Mg‐Ni‐Phyllosilicate Nanoscrolls

Krasilin

Khalisov

Khrapova

et al. 2021

Part & Part Syst Charact

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Some phyllosilicate compounds have the ability of spontaneous scrolling because of the size mismatch between the covalently bounded metal oxide and silica sheets. Their unique structure and high theoretically predicted Young's modulus (around 210–230 GPa) induce phyllosilicates’ application as reinforcing fillers. However, previous nanomechanical experiments with individual phyllosilicate nanoscrolls are in poor agreement with theory. The main reason for this is the low accuracy of experiments, which leads to large measurement errors compared to measured average values. Here, the study of the mechanical properties of synthetic (Mg1–xNix)3Si2O5(OH)4 phyllosilicates is reported by testing a suspended nanoobject (a nanobridge) with an atomic force microscope (AFM). The Young's modulus of corresponding phyllosilicate model layers is also calculated by means of the density functional theory (DFT). The original AFM approach makes it possible to account for the probe slipping off the nanobridge and determine its boundary conditions. The measured Young's modulus values are considered within the models of surface tension and shear strain contributions. The shear strain appears to have a decisive impact on the measured Young's modulus (from 150 ± 70 GPa to 200 ± 210 GPa) and its spread.

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Sulfated Halloysite Nanoscrolls as Superacid Catalysts for Oligomerization of Hexene-1

Cited by 8 publications

References 47 publications

Young’s modulus of phyllosilicate nanoscrolls measured by the AFM and by the in-situ TEM indentation

Young’s modulus of phyllosilicate nanoscrolls measured by the AFM and by the in-situ TEM indentation

Formation of a 10 A phase with halloysite structure under hydrothermal conditions with varying initial chemical composition

Surface Tension and Shear Strain Contributions to the Mechanical Behavior of Individual Mg‐Ni‐Phyllosilicate Nanoscrolls

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