Simulation of the formation of nanorolls

Chivilikhin, S A; Popov, I. Yu.; Blinova, Irina V.; Kirillova, Svetlana; Konovalov, A. S.; Oblogin, S. I.; Tishkin, Vitally; Chernov, Ilya; Гусаров, В. В.

doi:10.1134/s1087659607040037

Cited by 12 publications

(14 citation statements)

References 12 publications

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“…Critical nuclei appear to be formation is the intercalation of water between structural layers during deformation followed by strain release through a mechanism featuring layer separation followed by coiling (Chivilikhin et al 2007). Though not a property of separated nanoparticles, this kind of process relates stress reduction and hydration reactions to each other on the nanoscale, whereas entirely different strain release mechanisms ostensibly occur at larger scales.…”

Section: Silica Silicates and More Common Mineralsmentioning

confidence: 99%

Structure, Chemistry, and Properties of Mineral Nanoparticles

Waychunas¹,

Zhang²

2008

Elements

108

103

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Nanoparticle properties can depart markedly from their bulk analog materials, including large differences in chemical reactivity, molecular and electronic structure, and mechanical behavior.The greatest changes are expected at the smallest sizes, e.g. 10 nm and below, where surface effects are expected to dominate bonding, shape and energy considerations. The precise chemistry at nanoparticle interfaces can have a profound effect on structure, phase transformations, strain, and reactivity. Certain phases may exist only as nanoparticles, requiring transformations in chemistry, stoichiometry and structure with evolution to larger sizes. In general, mineralogical nanoparticles have been little studied. WHAT'S REALLY DIFFERENT ABOUT NANOPARTICLESNanoparticles, particularly those with diameters of less than 10 nm, have a high proportion of atoms near their surfaces (ca. 16% for a 10 nm cube). Because of this, several important aspects of surfaces can drive deviations from bulk structure and chemistry at different size scales. Size also directly affects a number of other bulk properties due to restriction on wave function radius, separation of defects and interacting strain fields, the relative overall dominance of bulk or surface energy, and changes in vibrational properties. Studies of nanoparticles connect with several other important scientific areas dealing with lower

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Section: Silica Silicates and More Common Mineralsmentioning

confidence: 99%

Structure, Chemistry, and Properties of Mineral Nanoparticles

Waychunas¹,

Zhang²

2008

Elements

108

103

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“…However, it should be noted that the mechanism of formation of nanorolls involves not only the important stage of twisting of nanolayers but also a sequence of different processes, which occur both sequentially and concurrently and result eventually in the formation of nanocrystalline or heterostructural nanotubes. In particular, the mechanism of formation of nanotubes with a chrysotile structure was studied in [21][22][23][24][25]. It was shown that, in a number of cases, the formation of nanorolls can be limited by crystallization of the initial compound with a layered structure.…”

Section: Introductionmentioning

confidence: 99%

“…It is worth noting that the layers of this compound can form nanorolls either upon their direct twisting or upon twisting of subsequent layers formed after a sequence of chemical transformations of the initially formed chemical compound with a layered structure. In this case, the chemical composition and the structure of initial components appear to be important factors that affect the formation of crystalline nanorolls [12,[21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Effect of the thermal prehistory of components on the hydration and crystallization of Mg3Si2O5(OH)4 nanotubes under hydrothermal conditions

2007

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The influence of the thermal prehistory of precursors on the phase transformations occurring in the MgO-SiO 2 -H 2 O(NaOH) system during hydrothermal synthesis of nanotubular magnesium hydrosilicates Mg 3 Si 2 O 5 (OH) 4 with a chrysotile structure is investigated by in situ Calvet calorimetry. It is demonstrated that the preliminary dehydration of the initial solid-phase reactants substantially affects the kinetics of their hydration and subsequent formation of nanotubes with a chrysotile structure.

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“…For example, some works describe the spontaneous rolling up of nanolayers under the action of internal forces [3,4]. In the present work, an attempt is made to describe the rolling up of nanotubes in a liquid medium from the standpoint of the energy balance in a system consisting of a nanometer-size thin film and molecules which sorb from solution onto the film's surface.…”

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confidence: 99%

Model of nanotube formation in solution under molecular sorption conditions

Poluéktov

Dmitriev

2009

At Energy

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Reliable disposal of radioactive wastes in nanosize containers which ensure that the wastes are isolated and strongly contained is investigated. A model of the process of incorporating impurity components into solutions where nanotubes are formed is presented to substantiate the possibility considered. An attempt is made to describe the rolling up of nanotubes in a liquid medium from the standpoint of the energy balance in a system that consists of a nanometer-size thin film and molecules which are sorbed on its surface from solution. The results show that when molecules are sorbed from solution onto a nanolayer surface the layer rolls up. The possibility that a roll or nanotube loses stability when sorbed molecules are present in them must be taken into account when studying the final state of the nanolayer.The problem of reliable isolation of radwastes has still not been solved. Its solution is tied to geological immobilization of radionuclides in a glass or crystalline matrix. A modern possibility for developing such a solution is to incorporate radwastes in nanosize containers (nanotubes, onions, and others) which securely confine the wastes. Such nanosize elements can be the basis for a new class of radwaste matrices. To substantiate this possibility, we present in this article a model of the process of incorporating impurity components into solutions where nanotubes are formed.The simulation of the structure and principles of synthesizing nanotube structures by rolling them up and studying their structure and properties is now a topic on the agenda [1]. The research being conducted in this field is of great interest because of the unusual properties of nanotubes and materials based on them.A great deal of experimental information showing the type of media in which and the conditions under which nanosize tubes are formed from thin films and layered compounds has now been accumulated throughout the world. However, there are not enough works on the theory of the synthesis process, without which it is impossible to predict accurately and to understand the structure and properties of the fundamentally new materials obtained.Various theoretical methods can be used to describe the mechanism by which nanotubular structures form [2]. For example, some works describe the spontaneous rolling up of nanolayers under the action of internal forces [3,4]. In the present work, an attempt is made to describe the rolling up of nanotubes in a liquid medium from the standpoint of the energy balance in a system consisting of a nanometer-size thin film and molecules which sorb from solution onto the film's surface. The main problem of the analysis presented here is to find the radius of curvature of the thin film.When molecules are sorbed onto the surface, a thin film part of the surface potential energy is converted into the binding interaction energy between a sorbed particle and a constituent molecule of the layer. A decrease of the surface energy results in the following phenomena. In the first place, it follows from the law ...

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Simulation of the formation of nanorolls

Cited by 12 publications

References 12 publications

Structure, Chemistry, and Properties of Mineral Nanoparticles

Structure, Chemistry, and Properties of Mineral Nanoparticles

Effect of the thermal prehistory of components on the hydration and crystallization of Mg3Si2O5(OH)4 nanotubes under hydrothermal conditions

Model of nanotube formation in solution under molecular sorption conditions

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