Interfacial phenomena at a surface of individual and complex fumed nanooxides

Гунько, В.М.; Туров, В.В.; Goncharuk, Olena; Pakhlov, E.M.; Matkovsky, O. K.

doi:10.15407/surface.2019.11.003

Cited by 46 publications

(29 citation statements)

References 322 publications

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“…structural changes in water upon freezing with increasing sizes of ice crystallites causing huge disjoining pressure up to 2000 atm). This ice pressure can lead to destroying of core-shell nanoparticles (50-200 nm) of complex FMO, but smaller silica NPNP keep integrity under high pressure by ice crystallites in thick-wall stainless steel cryoreactors [19,22]. .…”

Section: Adsorptionmentioning

confidence: 99%

“…Among these methods the most appropriate and reliable results could be provided by SAXS and high-resolution TEM (HRTEM) methods. However, additional mathematic treatments of the corresponding data should be done [16][17][18][19][20]. Fig.…”

Section: Adsorptionmentioning

confidence: 99%

“…The characteristics of such highly disperse materials as FMO depend strongly on the dispersion media properties because of several factors: (i) surface charging, (ii) NPNP swelling, (iii) colloidal stability and aggregation instability and others [16][17][18][19][20][49][50][51]. Electrophoretic mobility and secondary particle size distribution (SPSD) investigations could be performed using such apparatus based on the quasi-elastic light scattering (QELS) (photon correlation spectroscopy, static light scattering, or dynamic light scattering) method as a Zetasizer 3000 (Malvern Instruments).…”

Section: Quasi-elastic Light Scatteringmentioning

confidence: 99%

“…water, etc.) especially at temperatures lower than freezing temperature of bulk liquid that can be utilized in various methods to estimate the textural characteristics on the base of the temperature behavior of liquids confined in pores [16,18,19,[52][53][54]. Water can be frozen in narrower pores (or voids between nanoparticles) at lower temperatures as described by the GibbsThomson (GT) relation for the freezing point depression for liquids confined in cylindrical pores at radius R [16,[52][53][54] , ,…”

Section: Nmr Cryoporometrymentioning

confidence: 99%

“…); (iii) nonuniform distribution of components in complex systems; (iv) medium effects (e.g. swelling); and (v) incorrect or inadequate models and methods used in the analyses of the experimental data [1][2][3][4][17][18][19][20][21][22][23][24][25][26][27][28]. As a whole, it is of importance to analyze the differences in the characteristics determined using different indirect methods taking into account the measurement conditions.…”

Section: Introductionmentioning

confidence: 99%

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Nano/meso/macroporous materials characterization affected by experimental conditions and features of the used methods

Gun’ko¹

2020

Him. Fiz. Tehnol. Poverhni

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The aim of this study was to analyze a set of methods: adsorption, X-ray, microscopic, cryoporometry, relaxometry, and thermoporometry used to investigate the morphological and textural characteristics of materials being in vacuum, or gaseous or liquid dispersion media, as well the interfacial phenomena basic for the used approaches. Techniques used in the studies should be divided into eight groups: (i) adsorption-desorption of lowmolecular weight probe compounds (N 2 , Ar, etc.); (ii) adsorption or confinement of low-or high-molecular weight compounds in pores (voids) of solid particles being in liquid media; (iii) small angle X-ray scattering (SAXS) or small angle neutron scattering (SANS); (iv) quantitative analysis of images recorded using microscopic methods (TEM, SEM, AFM), etc.; (v) thermoporometry based on differential scanning calorimetry (DSC) with decreasing-increasing temperature utilizing melting thermograms; (vi) cryoporometry based on low-temperature 1 H NMR spectroscopy giving the dependence of signal intensity on temperature; (vii) relaxometry based on NMR spectroscopy dealing with transverse relaxation time vs. temperature; and (viii) relaxometry based on thermally stimulated depolarization current (TSDC) measurements related to dipolar and dc relaxations. Each method could be characterized by systematic errors caused by many factors. However, the use of a set of the aforementioned methods in parallel can allow one to elucidate the reasons and level of these systematic errors that is of importance for correct characterization of the materials studied. Thus, the larger the number of methods used in parallel, the more comprehensive the morphological and textural characterization of the adsorbents.

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Section: Adsorptionmentioning

confidence: 99%

Section: Adsorptionmentioning

confidence: 99%

Section: Quasi-elastic Light Scatteringmentioning

confidence: 99%

Section: Nmr Cryoporometrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Nano/meso/macroporous materials characterization affected by experimental conditions and features of the used methods

Gun’ko¹

2020

Him. Fiz. Tehnol. Poverhni

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Atomic charge distribution functions as a tool to analyze electronic structure of molecular and cluster systems

Gun'ko

2021

Int J of Quantum Chemistry

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A set of the characteristics calculated using any quantum chemical method can be attributed to local electronic structure, which may change for each atom in complex systems. Related average values can give poor characteristics because different atom fractions with different surroundings may have different electronic characteristics poorly corresponding to the average values. The aim of this work is to show that the distribution functions of atomic charges, as well as chemical shifts and molecular orbital energies, can be considered as a set of simple tools for easy analysis of complex systems within the scope of nonlocal characteristics describing whole systems.The approach efficiency and analysis adequacy depend on appropriateness of molecular and cluster models used. The systems with dozens or hundreds of molecules and solid nanoparticles of almost real sizes (>40 units, >2 nm) or calculated with periodic boundary conditions and expanded cells give more adequate nonlocal characteristics than much smaller systems with several molecules and small clusters (<10 units, <1 nm) can give.

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Comparison of the (photo)catalytic efficiency of Ag/Fe nanocomposites prepared by polyol synthesis and laser ablation

Donadelli¹,

Aiello

Aparicio

et al. 2022

J Nanopart Res

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Interfacial phenomena at a surface of individual and complex fumed nanooxides

Cited by 46 publications

References 322 publications

Nano/meso/macroporous materials characterization affected by experimental conditions and features of the used methods

Nano/meso/macroporous materials characterization affected by experimental conditions and features of the used methods

Atomic charge distribution functions as a tool to analyze electronic structure of molecular and cluster systems

Comparison of the (photo)catalytic efficiency of Ag/Fe nanocomposites prepared by polyol synthesis and laser ablation

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