Activation and structural and adsorption features of activated carbons with highly developed micro-, meso- and macroporosity

Gun'ko, V.М.; Туров, В.В.; Kozynchenko, O.P.; Николаев, В. Г.; Tennison, S.R.; Meikle, Steve; Snezhkova, E. A.; Sidorenko, A.S.; Ehrburger‐Dolle, Françoise; Morfin, Isabelle; Klymchuk, D. O.; Mikhalovsky, Sergey V.

doi:10.1007/s10450-010-9282-6

Cited by 31 publications

(51 citation statements)

References 26 publications

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“…from 0.53 g/cm 3 for carbonisate to 0.21 g/cm 3 for AC at 49% burn-off) [136]. The presence of broad nanopores provided good transport properties for the ACs studied [107,108,[135][136][137][138][139][140]. However, these properties can be changed during preparation of PVA/AC composites.…”

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confidence: 97%

“…13a) and include voids between nanoparticles forming microglobules and granules (Fig. 12b, C-7) [133][134][135][136][137][138][139][140]. An increase in the burn-off degree of ACs can cause an increase in the contribution of narrow nanopores (Table 4) and a PSD peak of broad nanopores shifted towards narrower pores (Fig.…”

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confidence: 99%

“…For porosimetry analysis of PVA or PVA/AC, the cryogels were dried in vacuo at 40 o C for 24 h until a constant weight was achieved. Nitrogen adsorption-desorption isotherms were used to compute the PSD using two models of mixed pore structures with (i) slit-shaped and cylindrical pores for carbons using the non-local DFT (NLDFT) method [131] (Quantachrome software, version 2.02) and (ii) slit-shaped (carbon) and cylindrical (carbon or polymer) pores and voids between spherical carbon particles, SCV (modified Nguyen-Do, MND, method) [132][133][134][135][136][137][138][139][140]. The differential PSDs f(R) ~ dV/dR (f(R)dR ~ V p , where R is the pore radius or half-width, were converted into incremental PSDs ((R i ) ~ V p ) for a better view of the PSDs over the total pore range.…”

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confidence: 99%

“…Therefore, the sample C-7 was selected for preparation of the PVA/AC composites [107]. The textural, adsorption, electronic and other characteristics of similar AC were described in detail [135][136][137][138][139][140].…”

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Cryogels: Morphological, structural and adsorption characterisation

Gun'ko

Savina

Mikhalovsky

2013

Advances in Colloid and Interface Science

281

205

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*Graphical Abstract (for review)Cryotripic gelation technique allows the synthesis of solid and soft macroporous gels Textural characterisation of cryogel in native superhydrated state with noninvasive methods Adsorption and diffusion characteristics of macroporous cryogels with respect to macromolecules and cells Theoretical modelling of adsorption from aqueous media *Highlights (for review) Please find the revised manuscript entitled "Cryogels: morphological, structural and adsorption characterisation" by Vladimir M. Gun'ko, Irina N. Savina, Sergey V. Mikhalovsky to re-consider for publication in the "Advances in Colloid and Interface Science"The paper was completely edited and changed according to reviewers comments.Sincerely yours, Prof. V. M. Gun'koCover Letter ABSTRACTExperimental results on polymer, protein, and composite cryogels and data treatment methods used for morphological, textural, structural, adsorption and diffusion characterisation of the materials are analysed and compared. Treatment of microscopic images with specific software gives quantitative structural information on both native cryogels and freeze-dried materials that is useful to analyse the drying effects on their structure. A combination of cryoporometry, relaxometry, thermoporometry, small angle X-ray scattering (SAXS), equilibrium and kinetic adsorption of low and high-molecular weight compounds, diffusion breakthrough of macromolecules within macroporous cryogel membranes, studying interactions of cells with cryogels provides a consistent and comprehensive picture of textural, structural and adsorption properties of a variety of cryogels. This analysis allows us to establish certain regularities in the cryogel properties related to narrow (diameter 0.4 < d < 2 nm), middle (2 < d < 50 nm) and broad (50 < d < 100 nm) nanopores, micropores (100 nm < d < 100 m) and macropores (d > 100 m) with boundary sizes within modified life science pore classification. Particular attention is paid to water bound in cryogels in native superhydrated or freeze-dried states. At least, five states of water -free unbound, weakly bound (changes in the Gibbs free energy G < 0.5-0.8 kJ/mol) and strongly bound (G > 0.8 kJ/mol), and weakly associated (chemical shift of the proton resonance  H = 1-2 ppm) and strongly associated ( H = 3-6 ppm) waters can be distinguished in hydrated cryogels using 1 H NMR, DSC, TSDC, TG and other methods. Different software for image treatment or developed to analyse the data obtained with the adsorption, diffusion, SAXS, cryoporometry and thermoporometry methods and based on regularisation algorithms is analysed and used for the quantitative morphological, structural and adsorption characterisation of individual and composite cryogels, including polymers filled with solid nano-or microparticles.

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confidence: 99%

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confidence: 99%

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confidence: 99%

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Cryogels: Morphological, structural and adsorption characterisation

Gun'ko

Savina

Mikhalovsky

2013

Advances in Colloid and Interface Science

281

205

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“…While the results of these previous investigations have shown a viable proof-of-concept and efficient adsorption of these cytokines, these adsorbents lack rapid kinetics due to a complex adsorption model [14,19]. More advanced synthetic materials have a high manufacturing cost.…”

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Rapid Adsorption of Proinflammatory Cytokines by Graphene Nanoplatelets and Their Composites for Extracorporeal Detoxification

Zheng

Pescatore

Gogotsi

et al. 2018

Journal of Nanomaterials

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Sepsis is a complex clinical syndrome that features excessive release of cytokines and other inflammatory mediators that could lead to organ dysfunction. Despite different treatment and management options, sepsis associated high morbidity and mortality rates remain. This has prompted intensive research into alternative therapeutic approaches such as targeted removal of sepsis related molecules using extracorporeal hemoperfusion. In this study, we explore the use of graphene nanoplatelets (GNP) as lowcost alternative hemosorbents for rapid removal of a broad spectrum of proinflammatory cytokine markers. Firstly, the physical characteristics, cytotoxicity, and cytokine marker adsorption profile of GNP were assessed. The results not only confirmed the surface characteristics of GNP and their ability to rapidly remove cytokine markers, but also indicated a low cytotoxicity towards the hepatic cell line HepG2. GNP were then incorporated into a freestanding flexible GNP-poly(tetrafluoroethylene) film with preserved surface characteristics and cytokine adsorption profile for potential use in hemoperfusion applications.

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Thermal and dielectric studies of PEG/C/AST nanocomposites

Klonos

Kaprinis

Zarko

et al. 2012

J of Applied Polymer Sci

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C/AST/PEG nanocomposites with fumed AST (89 wt % Al 2 O 3 , 10 wt % SiO 2 , 1 wt % TiO 2 ), activated carbon, and poly(ethylene glycol), PEG, were prepared in a wide range of PEG and C/AST (1 : 9) contents. Thermal transitions (mainly in a PEG phase) were investigated by differential scanning calorimetry. The dynamic behavior was investigated by thermally stimulated depolarization current and dielectric relaxation spectroscopy. The PEG crystallinity degree decreases in the nanocomposites, in particular at C PEG 40 wt %. A significant fraction of amorphous polymer is immobilized at a filler surface making no contribution to the glass transition, whereas the rest exhibits a lower glass transition temperature, when compared with bulk polymer, because of loosened molecular packing of the chains. Several relaxations arising from the polymer matrix, the filler, and their combination were identified and analyzed. The segmental a-relaxation of the PEG matrix was found to become faster in the nanocomposites.

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Activation and structural and adsorption features of activated carbons with highly developed micro-, meso- and macroporosity

Cited by 31 publications

References 26 publications

Cryogels: Morphological, structural and adsorption characterisation

Cryogels: Morphological, structural and adsorption characterisation

Rapid Adsorption of Proinflammatory Cytokines by Graphene Nanoplatelets and Their Composites for Extracorporeal Detoxification

Thermal and dielectric studies of PEG/C/AST nanocomposites

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