Mechanical fragmentation of precipitated silica aggregates

Quarch, Kerstin; Durand, Emilie; Schilde, Carsten; Kwade, Arno; Kind, Matthias

doi:10.1016/j.cherd.2010.01.007

Cited by 20 publications

(18 citation statements)

References 12 publications

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“…This work succeeds some of our previous work [3][4][5][6][7][8]. We refer to the literature [1,2,9-11] for a profound understanding of the polymerization and syneresis process of silica.…”

Section: State-of-the-artsupporting

confidence: 72%

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Influence of pH, Temperature and Sample Size on Natural and Enforced Syneresis of Precipitated Silica

Wilhelm

Kind

2015

Polymers

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Abstract:The production of silica is performed by mixing an inorganic, silicate-based precursor and an acid. Monomeric silicic acid forms and polymerizes to amorphous silica particles. Both further polymerization and agglomeration of the particles lead to a gel network. Since polymerization continues after gelation, the gel network consolidates. This rather slow process is known as "natural syneresis" and strongly influences the product properties (e.g., agglomerate size, porosity or internal surface). "Enforced syneresis" is the superposition of natural syneresis with a mechanical, external force. Enforced syneresis may be used either for analytical or preparative purposes. Hereby, two open key aspects are of particular interest. On the one hand, the question arises whether natural and enforced syneresis are analogous processes with respect to their dependence on the process parameters: pH, temperature and sample size. On the other hand, a method is desirable that allows for correlating natural and enforced syneresis behavior. We can show that the pH-, temperature-and sample size-dependency of natural and enforced syneresis are indeed analogous. It is possible to predict natural syneresis using a correlative model. We found that our model predicts maximum volume shrinkages between 19% and 30% in comparison to measured values of 20% for natural syneresis.

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“…This work succeeds some of our previous work [3][4][5][6][7][8]. We refer to the literature [1,2,9-11] for a profound understanding of the polymerization and syneresis process of silica.…”

Section: State-of-the-artsupporting

confidence: 72%

“…Gelation is accelerated with temperature and ionic strength. An increased energy dissipation results in smaller gel fragments, in analogy to a highly viscous fluid [7]. Enforced syneresis applied to a gel with an acidic reactant condition shows an analogous temperature behavior as natural syneresis [5].…”

Section: Introductionmentioning

confidence: 99%

Influence of pH, Temperature and Sample Size on Natural and Enforced Syneresis of Precipitated Silica

Wilhelm

Kind

2015

Polymers

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“…This series is an expansion of a previous study on mechanical fragmentation of silica gels [3]. While fragmentation is treated in more detail in the second part [4], the present paper focuses on gelation and the factors influencing it.…”

Section: Introductionmentioning

confidence: 98%

Inorganic Precipitated Silica Gel. Part 1: Gelation Kinetics and Gel Properties

Quarch

Kind

2010

Chem Eng & Technol

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Precipitated silica (SiO 2 ) is industrially produced by mixing a silicate solution with acid in a semi-batch process. Polycondensation of monomeric silica leads to the formation of particles which aggregate and eventually form a particulate gel. However, this is instantly fragmented by the mechanical energy input caused by the stirrer. Shrinkage and compaction of these fragments lead to the final product aggregates. It is the aim of this study to enable tailoring of the structure and size of these product particles via the process parameters. The present paper describes the influence of the parameters temperature, ionic strength, and composition, which affect the pH, on the properties of unstirred gels regarding their elasticity and thus their fragmentation behavior. Gelation time may be qualitatively estimated solely from the concentration of the feed materials.

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“…The primary particle sizes are in the nanoscale, however the primary particle size of the commercial precipitate silica is smaller than the synthetic amorphous silica obtained. According Quarch et al (2010) the primary particle size of the synthetic amorphous silica depend on the rate of gelation process [11]. There are many factors influenced the rate of gelation such as temperature, pH and ionic strength of the solution.…”

Section: Synthetic Amorphous Silicamentioning

confidence: 99%

Effective utilizations of palm oil mill fly ash for synthetic amorphous silica and carbon zeolite composite synthesis

Utama

Saputra

Khairat

2018

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. Palm Oil Mill Fly Ash (POMFA) the solid waste of palm oil industry was used as a raw material for synthetic amorphous silica and carbon zeolite composite synthesis in order to minimize the wastes of palm oil industry. The alkaline extraction combine with the sol-gel precipitation and mechanical fragmentation was applied to produce synthetic amorphous silica. The byproduct, extracted POMFA was rich in carbon and silica content in a significant amount. The microwave heated hydrothermal process used to synthesize carbon zeolite composite from the byproduct. The obtained silica had chemical composition, specific surface area and the micrograph similar to commercial precipitated silica for rubber filler. The microwave heated hydrothermal process has a great potential for synthesizing carbon zeolite composite. The process only needs one-step and shorter time compare to conventional hydrothermal process.

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Mechanical fragmentation of precipitated silica aggregates

Cited by 20 publications

References 12 publications

Influence of pH, Temperature and Sample Size on Natural and Enforced Syneresis of Precipitated Silica

Influence of pH, Temperature and Sample Size on Natural and Enforced Syneresis of Precipitated Silica

Inorganic Precipitated Silica Gel. Part 1: Gelation Kinetics and Gel Properties

Effective utilizations of palm oil mill fly ash for synthetic amorphous silica and carbon zeolite composite synthesis

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