Morphological and textural features of various materials composed of porous or nonporous nanoparticles differently packed in secondary structures

Gun’ko, Vladimir M.

doi:10.1016/j.apsusc.2021.151117

Cited by 15 publications

(10 citation statements)

References 40 publications

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“…as it was shown for various adsorbents [66,[69][70][71][72][73][74]. The PSD functions with respect to the SSA ( )…”

Section: Nitrogen Adsorptionmentioning

confidence: 75%

“…For highly disperse adsorbents composed of NPNP of various sizes, the similar dependence is rather questionable due to the absence of pores of a certain fixed shape (e.g., cylindrical or slit-shaped) since voids between NPNP, characterized by a certain particle size distribution, have random and complex shapes. However, for fumed silicas, there is a certain tendency of increasing pore volume with increasing SSA value (or decreasing NPNP sizes) [73,74] (Fig. 1 a).…”

Section: Resultsmentioning

confidence: 98%

“…However, the VCV/SCR method reduces the systematic errors appearing upon the application of the firm software for complex materials. As a whole, the accuracy of the textural characteristics depends on several factors such as the errors in: (i) estimation of the characteristics of probe molecules (e.g., occupied area for N 2 depends on the surface chemistry of adsorbents and it is equal to 0.162 nm 2 for basal planes of carbons and 0.137 nm 2 for silica); (ii) the pore models; and (iii) the solution of the integral equations describing adsorption [64][65][66][67][68][69][70][71][72][73][74][75][76][77][78]. The total errors could be estimated as ±10-15 % with a high level of the repeatability of the adsorption data.…”

Section: Nitrogen Adsorptionmentioning

confidence: 99%

“…The total errors could be estimated as ±10-15 % with a high level of the repeatability of the adsorption data. It should be noted that the errors caused by the inaccuracy of the used computation methods (using appropriate complex models of pores and adsorbent surfaces) are smaller than those caused by some inaccuracy of the measurement methods [69][70][71][72][73][74]. In the case of the equilibrium adsorption of polymers, the errors appear due to some inaccuracy in determination of fractions of nonadsorbed and adsorbed polymers using various spectroscopic and gravimetric methods.…”

Section: Nitrogen Adsorptionmentioning

confidence: 99%

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Textural characteristics and organization of composites with fumed silicas and high-molecular weight compounds

Gun'ko¹

2022

Him. Fiz. Tehnol. Poverhni

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Various composites with nanosilicas, as well as with other nanooxides, and polymers are of importance from a practical point of view. Detailed textural and morphological characterization, applied here to nanosilicas treated alone and in composites with a set of polymers (poly(vinyl pyrrolidone), poly(vinyl alcohol), poly(ethylene oxide), poly(ethylene glycol), polydimethylsiloxane, and polymethylsiloxane) and proteins (egg albumin, gelatin, and ossein), could be considered as a tool to evaluate the reorganization of hierarchical structures in composites from aggregates of nanoparticles, agglomerates of aggregates, to micro and visible particles. This analysis allows one to elucidate various changes in the porosity, accessible surface area, contributions of pores of different sizes and shapes and pore walls with silica or polymer/protein depending on a set of varied factors. Collected information could be used to forecast possible characteristics and properties of various composites with nanooxides. Among the factors affecting the properties and characteristics of the composites, a type, molecular weight, and content of a polymer and treatment conditions may play an important role. The presence of a large set of the factors makes difficult analysis of the composites using simplified approaches and methods. As a whole, selection of the composition and certain conditions of the composite preparation allows one to control all the textural characteristics of the final materials. For these purposes, the characteristics should be accurately estimated with minimum possible errors using well developed and adequate methods.

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“…as it was shown for various adsorbents [66,[69][70][71][72][73][74]. The PSD functions with respect to the SSA ( )…”

Section: Nitrogen Adsorptionmentioning

confidence: 75%

Section: Resultsmentioning

confidence: 98%

Section: Nitrogen Adsorptionmentioning

confidence: 99%

Section: Nitrogen Adsorptionmentioning

confidence: 99%

See 2 more Smart Citations

Textural characteristics and organization of composites with fumed silicas and high-molecular weight compounds

Gun'ko¹

2022

Him. Fiz. Tehnol. Poverhni

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“…The nitrogen desorption data were used to compute the pore size distributions (PSD, differential fV(R) ~ dVp/dR and fS(R) ~ dS/dR) using a self-consistent regularization (SCR) procedure under non-negativity condition (fV(R)  0 at any pore radius R) at a fixed regularization parameter  = 0.01. A complex pore model was applied with slit-shaped (S) pores in carbon and cylindrical (C) pores in silica and voids (V) between spherical carbon or metallic nanoparticles packed in random aggregates (pore models used SCV, VCV, or CV with SCR method) with the density functional theory (DFT) method [60][61][62]. The differential PSD with respect to the pore volume fV(R) ~ dV/dR, fV(R)dR ~ Vp were recalculated to incremental PSD (IPSD) at V(Ri) = (fV(Ri+1) +fV(Ri))(Ri+1 Ri)/2 at V(Ri) = Vp.…”

Section: Nitrogen Adsorption-desorption Isotherms and Textural Charac...mentioning

confidence: 99%

Hybrid composites prepared by carbonization of acetylacetone and metal acetylacetonates on a surface of silica gel

Гунько¹,

Skubiszewska²,

Charmas³

2022

Poverhn.

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Hybrid adsorbents with carbon/silica, carbon/metal oxide/silica, and carbon/metal/silica could be of interest from a practical point of view since they can effectively adsorb both polar and nonpolar compounds. Therefore, mesoporous silica gel Si–60 modified by carbonization acetylacetone or Ti, Zn, Ni, Co, Cr, Zr acetylacetonates has been studied using nitrogen and water adsorption–desorption, thermogravimetry, transmission electron microscopy, X–ray diffraction, and X–ray fluorescence methods. Grafted C/X phases consist of metal compounds (X denotes metal oxide or silicate or/and metal) and char, whose characteristics can be varied changing metal in the precursors and their amounts. The morphological, structural, and textural characteristics of C/X/SiO2, such as composition and particle size distributions of deposits, a number and kind of polar and non polar surface sites, specific surface area, pore volume, and pore size distributions depend on the type, content, and distribution of the C/X deposits. The changes in the grafted matters occur with increasing precursor and C/X concentrations and a possible catalytic effect of the X phases on the carbonization reactions. Appropriate selection of precursor structure and amounts allows one to vary and control the characteristics of whole hybrid adsorbents that is of importance from a practical point of view.

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Studies on the Process of Basic Dyes Adsorption on Uniform Spherical Carbons

Sternik,

Wasilewska,

Derylo‐Marczewska

et al. 2024

ChemPhysChem

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The influence of carbon pore structure on the sorption process of selected cationic dyes has been investigated. The structure and surface of carbonaceous materials have been characterized basing on various techniques: scanning electron microscopy, low temperature nitrogen adsorption–desorption measurements, X–ray photoelectron spectroscopy and thermal analysis combined with identification of gaseous products. The kinetic and equilibrium adsorption measurements of Basic Violet 3, Basic Red 1 and Basic Blue 9 from aqueous media were performed. The studied carbons seem to be promising adsorbents towards dyes, taking into account the easy–to–use uniform spherical form of the granules and a complex type of porosity with micro–, meso– and macropores appropriate for large molecule adsorption.

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Morphological and textural features of various materials composed of porous or nonporous nanoparticles differently packed in secondary structures

Cited by 15 publications

References 40 publications

Textural characteristics and organization of composites with fumed silicas and high-molecular weight compounds

Textural characteristics and organization of composites with fumed silicas and high-molecular weight compounds

Hybrid composites prepared by carbonization of acetylacetone and metal acetylacetonates on a surface of silica gel

Studies on the Process of Basic Dyes Adsorption on Uniform Spherical Carbons

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