Fumed Silicas Possessing Different Morphology and Hydrophilicity

Gun'ko, V.М.; Mironyuk, Ivan; Zarko, V.I.; Туров, В.В.; Воронин, Е. Ф.; Pakhlov, E.M.; Goncharuk, E.V.; Лебода, Р.; Skubiszewska–Zięba, J.; Janusz, W.; Chibowski, S.; Levchuk, Yu.N.; Klyueva, Alla V.

doi:10.1006/jcis.2001.7736

Cited by 71 publications

(67 citation statements)

References 30 publications

(18 reference statements)

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“…fumed) or crystalline (e.g. zeolites) SA, the higher the Brönsted acidity [18,31,[90][91][92]. The sample SA8 has a larger S BET and C Al 2 O3 s values than SA3.…”

Section: Characteristicsmentioning

confidence: 92%

TSDC spectroscopy of relaxational and interfacial phenomena

Gun'ko

Zarko

Goncharuk

et al. 2007

Advances in Colloid and Interface Science

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134

167

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“…fumed) or crystalline (e.g. zeolites) SA, the higher the Brönsted acidity [18,31,[90][91][92]. The sample SA8 has a larger S BET and C Al 2 O3 s values than SA3.…”

Section: Characteristicsmentioning

confidence: 92%

TSDC spectroscopy of relaxational and interfacial phenomena

Gun'ko

Zarko

Goncharuk

et al. 2007

Advances in Colloid and Interface Science

Self Cite

134

167

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“…4.1a-c), comprising of primary particles (size range = 5-50 nm) fused into stable fractal aggregates (size range = 100-500 nm) which further grow into micron-size agglomerates stabilized by hydrogen bonding and electrostatic interactions [5,6]. The aggregates have an open structure (3D fractal dimension, D f, 3 ≈ 2.0), while the agglomerates are much more compact (D f, 3 ≈ 2.5) [7].…”

Section: Complex Structure Of Fumed Silicamentioning

confidence: 99%

Inorganic Particle-Based Oleogels

Patel

2015

Alternative Routes to Oil Structuring

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Fumed silica has a complex microstructure comprising of micron-sized agglomerates of submicron aggregates of nanosized primary particles. Due to this complex microstructure and interesting surface chemistry, fumed silica is capable of forming oleogels through the formation of a continuous 3D network stabilized by hydrogen bonding among particles. These oleogels can be further combined with weak water gels to create a relatively unexplored class of colloids called bigels. The microstructure and rheological properties of fumed silica-based oleogels and bigels are described in details in this chapter.

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“…The freezing of aqueous suspensions of nanosilica in high-pressure reactors results in dried powdered materials that are very different from silicas treated in vapor phase water at high pressures and temperatures [30][31][32][33][34][35][36][37], at high temperatures and normal pressure in air [38], or at room temperature and normal pressure followed by air drying [39][40][41]. The air-dried high-pressure cryosilicas are in the powder state with agglomerates of 1-20 m in size (Fig.…”

Section: Effects Of Freezing Conditions On the Particle Morphology Anmentioning

confidence: 99%

“…This is due to re-arrangement of nanoparticles in aggregates and agglomerates of aggregates during suspension and subsequent drying. Primary particles become mobile in sonicated aqueous suspensions including a large proportion of individual nanoparticles [32][33][34][35][36][37][38][39][40][41].…”

Section: Effects Of Freezing Conditions On the Particle Morphology Anmentioning

confidence: 99%

“…During drying of the suspensions, nanoparticles tend to form more compacted aggregates and agglomerates than those formed in the flame (flow velocity > 20 m/s) during pyrogenic synthesis [32][33][34][35][36][37][38][39][40][41]. There is empty volume (V em = 1/ b -1/ 0 ) of the powder, which is directly links to the bulk density  b and true density ( 0 = 2.2 g/cm 3 ) of silicas.…”

Section: Effects Of Freezing Conditions On the Particle Morphology Anmentioning

confidence: 99%

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High-pressure cryogelation of nanosilica and surface properties of cryosilicas

Gun’ko

Туров

Zarko

et al. 2013

Colloids and Surfaces A: Physicochemical and Engineering Aspect

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Gun'ko, V M.; Turov, V V.; Zarko, V I.; Prykhod'ko, G P.; Remez, O S.; Leboda, R; Skubiszewska-Zieba, J; Pahklov, E M.; and Blitz, Jonathan, "High-pressure cryogelation of nanosilica and surface properties of cryosilicas" (2013 AbstractSilica cryogels (cryosilicas) in a powder state were synthesized with different concentrations of fumed silica A-300 (C A-300 = 5-20 wt.%), sonicated in aqueous suspension, then frozen at 14 o C at different pressures in a high-pressure stainless steel reactor (a freezing bomb), and dried in air at room temperature. To analyze the effects of low temperature and high pressure, samples were also prepared at 14 o C or room temperature and standard pressure. The structural and adsorption properties of the powder materials were studied using nitrogen adsorption, highresolution transmission electron microscopy, infrared spectroscopy, thermogravimetry, lowtemperature 1 H NMR spectroscopy and thermally stimulated depolarization current. The structural, textural, adsorption and relaxation characteristics of high-pressure cryogel hydrogels and related dried powders are strongly dependent on the silica content in aqueous suspensions frozen at 1, 450 or 1000 atmospheres and then dried. The largest changes are found with C A-300 = 20 wt.% which are analyzed with respect to the interfacial behavior of nonpolar, weakly polar and polar adsorbates using low temperature 1 H NMR spectroscopy.

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Fumed Silicas Possessing Different Morphology and Hydrophilicity

Cited by 71 publications

References 30 publications

TSDC spectroscopy of relaxational and interfacial phenomena

TSDC spectroscopy of relaxational and interfacial phenomena

Inorganic Particle-Based Oleogels

High-pressure cryogelation of nanosilica and surface properties of cryosilicas

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