Peculiarity of inelastic properties of sedimentary SiO2, foam polystyrene

Онанко, А. П.; Charnyi, D. V.; Onanko, Y. A.; Kulish, M. P.; Dmytrenko, О. P.; Homenko, R. V.

doi:10.3997/2214-4609.2020geo040

Cited by 5 publications

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“…The relaxation time τ of these processes is determined by their nature and is a material constant. The relaxation time of the processes associated with the migration of atoms is described by exponential dependence: 22 e , 2 ECS Journal of Solid State Science and Technology, 2024 13 045001…”

Section: Resultsmentioning

confidence: 99%

Anelastic Internal Friction and Mechanical Spectroscopy of SiO₂/Si Wafers

Onanko,

Kuzmych,

Onanko

et al. 2024

ECS J. Solid State Sci. Technol.

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In this work, after electron irradiation and X-ray, the outcomes of the evaluation dynamic characteristics of interstitial atoms Sij , vacancy V, and O-complexes were evaluated to account for the annealing conditions to derive specific structural defects in the SiO2/Si wafer. A non-destructive method, which allows the determination of the internal friction difference ΔQ-1/Q-1 0 of the elastic vibration of structural defects of dislocations with density ND and the depth of the broken layer hb , is offered for the SiO2/Si wafer. The method was developed, the installation was designed and manufactured for the excitation and registration of damped bending resonant oscillations in a SiO2/Si disc-shaped wafer with a thickness hSiO2 ≈ 100 nm, his = 300÷500×103 nm, and diameter D = 60÷100×10-3 m to measure the structurally sensitive internal friction Q-1 in vacuum P ≈ 10-2 Pa. Measurement of the internal friction background Q-1 0 at harmonic frequencies f0 and f2 allowed us to experimentally determine the nodal lines of the oscillating disks.

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Section: Resultsmentioning

confidence: 99%

Anelastic Internal Friction and Mechanical Spectroscopy of SiO₂/Si Wafers

Onanko,

Kuzmych,

Onanko

et al. 2024

ECS J. Solid State Sci. Technol.

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“…In the case of adsorption by a layer of filter media, instead of the porosity of the intergranular space, the term porosity of the filter media layer is often used [10][11][12][13][14][15]. Table 1 presents the most important correlations.…”

Section: Results Of the Study And Their Discussionmentioning

confidence: 99%

Kinetic Model of the Initial Stage of the Process of Colloid Retention by the Pore Space of Sokyrnite

Onanko,

Onanko

2023

LRaWM

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The physicochemical phenomena occurring on the surface of sokyrnite grains in complex system "medium grain surface - dispersion medium - surface of suspended particles" have been studied. The framework structure of the sokyrnite structure (rough surface, presence of pores and channels, entrance windows) enables it to work as a "molecular sieve" and to be a highly efficient sorbent-ion exchanger. The porosity of the filter media was determined. Namely: the porosity of the media grains (also called the internal porosity) and the porosity of the intergranular space (media layer). The internal surface area, which is an important quality parameter for sokyrnite as a physical adsorbent, was determined. Several other properties associated with sokyrnite and retained colloidal particles, which affect the strength of the physical adsorption, were investigated. The relationships characterizing the parameters of the zeolite filter media layer were formulated and given. In these studies, the requirements for determining the filter charging time and the optimal technological and design parameters of the filter, according to the operating conditions at a specific water treatment facility, were considered. They determined the need for more detailed research and development of a kinetic model for the initial stage of filtering an aqueous suspension through a filter containing zeolite media. A differential material balance expression for the zeolite filter was formulated. Based on the developed kinetic model, comparative experiments on iron removal from underground natural waters using the above-mentioned filter material were planned and carried out. The mechanism of the distribution of iron ions in the filter space due to the phenomenon of diffusion, in accordance with Fick's first law, is given. The mechanism of iron flake retention by the zeolite media pore space, the consolidation of which occurs during the transition of iron from a divalent to trivalent form, is described. The factors that interfere with autocatalytic processes in iron sediments were described. The dynamics of changes in the concentration of iron in the filtrate after the end of the ion-exchange resource of sokyrnite were studied.

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Model of the Initial Stage of Colloids Retention by a Filter Bed Media Taking Into Account the Phenomenon of Electrostatic Adsorption

Onanko,

Kuzmych

2024

Advances in Environmental Engineering and Green Technologies

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Given the insufficient study of the initial stage of filtering an aqueous suspension through granular filter media, this research was devoted to a detailed study of the parameters of its physical-mathematical model. According to its kinetic parameters, the initial stage of filtration is significantly different from that of the main stage. This chapter presents the results of the analytical processing of modern physical-mathematical models of colloidal suspension filtration through granular media, which are known from the scientific literature. This analytical treatment was prompted by the need to take into account, established by the results of our experimental and literary studies, the determining influence of the phenomenon of electrostatic adsorption, and the magnitude of the ζ-potential of the components of the studied system “media grain surface – dispersion medium – surface of suspended particles” on the process of filtering a colloidal suspension through polystyrene foam granular media.

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Peculiarity of inelastic properties of sedimentary SiO2, foam polystyrene

Cited by 5 publications

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Anelastic Internal Friction and Mechanical Spectroscopy of SiO₂/Si Wafers

Anelastic Internal Friction and Mechanical Spectroscopy of SiO₂/Si Wafers

Kinetic Model of the Initial Stage of the Process of Colloid Retention by the Pore Space of Sokyrnite

Model of the Initial Stage of Colloids Retention by a Filter Bed Media Taking Into Account the Phenomenon of Electrostatic Adsorption

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Peculiarity of inelastic properties of sedimentary SiO2, foam polystyrene

Cited by 5 publications

References 0 publications

Anelastic Internal Friction and Mechanical Spectroscopy of SiO2/Si Wafers

Anelastic Internal Friction and Mechanical Spectroscopy of SiO2/Si Wafers

Kinetic Model of the Initial Stage of the Process of Colloid Retention by the Pore Space of Sokyrnite

Model of the Initial Stage of Colloids Retention by a Filter Bed Media Taking Into Account the Phenomenon of Electrostatic Adsorption

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Product

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Anelastic Internal Friction and Mechanical Spectroscopy of SiO₂/Si Wafers

Anelastic Internal Friction and Mechanical Spectroscopy of SiO₂/Si Wafers