Differences between silica and silica-alumina gels II. A proposed mechanism for the gelation and syneresis of these gels

Plank, C. J.

doi:10.1016/0095-8522(47)90044-5

Cited by 32 publications

(15 citation statements)

References 10 publications

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“…A study of aluminium fuel corrosion shows that a thin aluminium gel layer forms at the surface [8]. Peptization of the gel by dripping water may produce these aluminium oxide colloids [14]. In addition, colloids precipitate from solution with increasing ionic strength.…”

Section: Discussionmentioning

confidence: 99%

Colloids from the aqueous corrosion of aluminium-based nuclear fuel

Kaminski

Goldberg

Mertz

2005

Journal of Nuclear Materials

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Section: Discussionmentioning

confidence: 99%

Colloids from the aqueous corrosion of aluminium-based nuclear fuel

Kaminski

Goldberg

Mertz

2005

Journal of Nuclear Materials

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“…The thickness and porosity of the cell walls depends on the concentration (density) of silicate species used in the gel 72. The gelation time varies with silicate reactant concentration,101 pH,102 temperature,103 and the identity of the acid catalyst104 and affects the final structure of the hydrogel network. For example, acidification with stronger acid results in longer gelation times, forming acidic gels that are composed of networks with particulate character (Figure 1h).…”

Section: Introductionmentioning

confidence: 99%

Crystal Growth of Calcium Carbonate in Hydrogels as a Model of Biomineralization

Asenath‐Smith

Keene

et al. 2012

Adv Funct Materials

197

307

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A gel is defi ned as a two-component (solid and liquid), continuous, solid-like material with viscoelastic rheological Crystal Growth of Calcium Carbonate in Hydrogels as a Model of BiomineralizationIn recent years, the prevalence of hydrogel-like organic matrices in biomineralization has gained attention as a route to synthesizing a diverse range of crystalline structures. Here, examples of hydrogels in biological, as well as synthetic, bio-inspired systems are discussed. Particular attention is given to understanding the physical versus chemical effects of a broad range of hydrogel matrices and their role in directing polymorph selectivity and morphological control in the calcium carbonate system. Finally, recent data regarding hydrogel-matrix incorporation into the growing crystals is discussed and a mechanism for the formation of these single-crystal composite materials is presented. Future and is researching crystal growth in gels as a means to form nanocomposites.chains form helices (double or single helices) that subsequently aggregate into three-dimensional (3D) bundles, forming a porous network with fi brous characteristics (Figure 1 a,b). [ 82 , 83 ] Both the gelling and melting temperatures can be tailored by chemical modifi cation such as partial hydroxyethylation. [ 84 ] The mechanical behavior of agarose gels is sensitive to molecular weight and concentration [ 85 ] as well as chemical modifi cation.

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“…The bulk and surface composition of ASA can vary depending on the synthesis. Plank and Drake reported that the bulk of the aluminum for their ASA samples was present on the surface [63,66], however, other reports suggest a more uniform distribution [67,68]. [69,72], but the number of these strong acid sites is very low (< 10 µmol g -1 ).…”

Section: Amorphous Silica-alumina Catalystsmentioning

confidence: 96%

“…An important factor that can affect the pore-size distribution of the catalyst is the aging time of the gel [63]. Another method to control the pore size of ASA catalysts is by employing bulky tetraalkylammonium ions as the counterions to the aluminate ions in the gel [64].…”

Section: Amorphous Silica-alumina Catalystsmentioning

confidence: 99%

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Solid Acid Catalysts for Endothermic Fuels

Huang

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Vehicles traveling at high supersonic and hypersonic flight speeds experience high thermal heat loads from aerodynamic heating that exceed the heat sink capacity of existing thermal management systems. Conventional thermal management systems are limited by the physical heat sink capacity of hydrocarbon fuels. One method to increase the heat sink capacity of hydrocarbon fuels is to carry out endothermic reactions on the hydrocarbon fuel near the heat load. The breaking of C-C bonds over a catalyst, otherwise known as catalytic cracking, is an endothermic reaction that can provide a substantial heat sink for so called endothermic fuels. Understanding the effects of catalyst porosity and hydrocarbon molecular structure for catalytic cracking under supercritical conditions is necessary for the rational design of catalyst/fuel pairings for endothermic fuels. In this study, reactions of linear, branched, and cyclic hydrocarbons were performed over micro-and mesoporous solid acid catalysts under supercritical conditions. Measurements of intrinsic rate parameters were used to develop a fundamental understanding of the reaction mechanism under supercritical conditions.

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Differences between silica and silica-alumina gels II. A proposed mechanism for the gelation and syneresis of these gels

Cited by 32 publications

References 10 publications

Colloids from the aqueous corrosion of aluminium-based nuclear fuel

Colloids from the aqueous corrosion of aluminium-based nuclear fuel

Crystal Growth of Calcium Carbonate in Hydrogels as a Model of Biomineralization

Solid Acid Catalysts for Endothermic Fuels

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