Factors of aggregative stability of silica hydrosols

Frolov, Yu. G.; Шабанова, Н. А.

doi:10.1021/la00077a009

Cited by 10 publications

(7 citation statements)

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“…At high pH, the samples with a lower amount of free mPEG present (sample ii) remain cloudy aer being passed through their cloud points, if kept at high temperature for more than 20 minutes before being cooled, but this does not occur for sample i. High pH catalyses the formation of ion-bridges and siloxane bonds through condensation reactions, which promotes aggregation of the silica particles, 24,25 but this process can be avoided with a higher total amount mPEG in the suspension. A steric effect preventing aggregation can therefore exist for sample i, where the free silanes present in the suspension aid this stabilization mechanism though adsorbing in thicker layers, or possibly double layers.…”

Section: Mpeg Stabilization and Salting-out Effectsmentioning

confidence: 99%

Clouding observed for surface active, mPEG-grafted silica nanoparticles

Björkegren

Nordstierna

Sundblom³

et al. 2019

RSC Adv.

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Section: Mpeg Stabilization and Salting-out Effectsmentioning

confidence: 99%

Clouding observed for surface active, mPEG-grafted silica nanoparticles

Björkegren

Nordstierna

Sundblom³

et al. 2019

RSC Adv.

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“…The effect of pH is somewhat different in that the rate is either retarded or the reaction prevented altogether at high and low pH levels, owing to the formation of high concentrations of silicate anions or un-ionised silicic acid molecules, respectively. Below about pH 2, the rate again increases concomitantly with acidity [59,74], possibly owing to the formation of the cationic species (OH) 3 SiOH 2 + [75]. The pH at which the maximum rate occurs is another area where there is some disagreement, with published values falling in the range pH 6.5±9 [58,69,76,77].…”

Section: Introductionmentioning

confidence: 99%

Biosilicification: the role of the organic matrix in structure control

2000

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Silicon (although never in the elemental form) is present in all living organisms and is required for the production of structural materials in single-celled organisms through to higher plants and animals. Hydrated amorphous silica is a mineral of infinite functionality and yet it is formed into structures with microscopic and macroscopic form. Research into the mechanisms controlling the process have highlighted proteins and proteoglycans as possible control molecules. Such molecules are suggested to play a critical role in the catalysis of silica polycondensation reactions and in structure direction. This article reviews information on silica form and function, silica condensation chemistry, the role of macromolecules in structure control and in vitro studies of silica formation using biomolecules extracted from biological silicas. An understanding of the mechanisms by which biological organisms regulate mineral formation will assist in our understanding of the essentiality of silicon to life processes and in the generation of new materials with specific form and function for industrial application in the 21st century.

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“…Frolov Yu. G. [16][17][18] developed the main ratios of the thermodynamic theory of aggregative stability of water dispersion systems. The key role of the boundary layers and the water dispersion aggregate stability is experimentally confirmed in the studies [19,20].…”

Section: Theoretical Partmentioning

confidence: 99%

Colloid-Chemical Bases on Creation of Multifunctional Modifiers of Concrete Mix and Concrete

Kosukhin

Shapovalov

Kosukhin

2017

SSP

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The colloid and chemical bases on creation of highly effective multifunctional modifiers were developed on the basis of the experimental data in the field of chemical modifying of concrete compounds and concrete. The article shows that the leading role in concrete chemicalixation now belongs to the components of the given class, because application of these components supplies the concrete compound and the concrete with a complex of specified properties for operation in different conditions. The article notes that this tendency is true while monolithic concreting, as it is most widely applied when carrying out maintenance operations and it places higher quality requirements upon the concrete compounds and the concrete. The study syntesizes a highly efficient multifunctional modifier for monolithic concretes. This modifier posesses a fungicidal effect and contains a plasticizing component, an accelerator of cement hydration processes, concrete hardening. The article also studies the colloid and chemical properties of the obtained modifier and the properties of the concrete compounds and the concrete with its application.

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Factors of aggregative stability of silica hydrosols

Cited by 10 publications

References 0 publications

Clouding observed for surface active, mPEG-grafted silica nanoparticles

Clouding observed for surface active, mPEG-grafted silica nanoparticles

Biosilicification: the role of the organic matrix in structure control

Colloid-Chemical Bases on Creation of Multifunctional Modifiers of Concrete Mix and Concrete

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