Controlled stabilisation of silicic acid below pH 9 using poly(1-vinylimidazole)

Annenkov, Vadim V.; Danilovtseva, Elena N.; Likhoshway, Yelena V.; Patwardhan, Siddharth V.; Perry, Carole C.

doi:10.1039/b716367n

Cited by 32 publications

(44 citation statements)

References 21 publications

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“…This results in encapsulation of siliceous particles in organic macromolecules giving rise to soluble composite nanoparticles similar to nonstoichiometric complexes between organic polymers. This behavior was observed for amine containing polymers, 112 polymers with imidazole moieties [82][83][84] and polyampholytes. 2.…”

Section: Length and Exibility Of The Polymer Chainmentioning

confidence: 79%

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Silicic acid condensation under the influence of water-soluble polymers: from biology to new materials

et al. 2017

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Silicon is among the most abundant elements on the Earth. It occurs in many minerals and plays an important role in several biochemical processes. Some living organisms use silicon dioxide as a substrate for building elements of their bodies. Unicellular diatom algae build frustules from silicon dioxide. The skeleton of siliceous sponges is a silicaprotein composite. Similarly, rice hulls which protect seeds, contain silica as an important component. The living organisms assimilate silicon from the environment in the form of silicic acid. However, the biochemical mechanisms involved in the transformation of silicic acid to solid siliceous materials are still poorly understood.Evidently, condensation of silicic acid in the living organisms proceeds under control of biopolymers and it is important to know how various types of polymers influence the condensation. Bio-inspired chemistry involving the interaction between polymeric silicic acid and functional polymers results in interesting composite materials, including nanoparticles and bulk materials. This review contains a brief description of the mechanism of silicic acid condensation in aqueous medium and also includes a discussion on various precursors of silicic acid. The main focus of the review is on the influence of polymers bearing nitrogen and oxygen-containing functional groups on silicic acid condensation starting from monomer to three-dimensional polymer. Influence of molecular weight of the organic polymer on the condensation and structure of the resulting product is also elaborated. The biological importance of the obtained data and strategies for novel applications of the synthesized composite materials are described in the concluding section of the review. The biomimetic condensation processes open up new vistas for development of novel materials and applications in the biomedical and process industries.

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Section: Length and Exibility Of The Polymer Chainmentioning

confidence: 79%

“…84,85,102 The same effect is probably dominant in the case of poly(N-methacryloyl-L-histidine), 102 poly(1-vinylpyrrolidone) 136 and PEG.…”

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confidence: 88%

Silicic acid condensation under the influence of water-soluble polymers: from biology to new materials

et al. 2017

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“…We hypothesise that primary oligosilicate particles forming on silicic acid condensation interact with amine groups from the surface of polymeric coils, giving rise to large aggregates (Scheme 2). The rearrangement of silica particles and polymeric chains occurs during further Si(OH) 4 condensation, yielding stable organo-silica nanoparticles similar to some polymeric bases [36,37,40].…”

Section: Resultsmentioning

confidence: 99%

The Effect of Titanium, Zirconium and Tin on the Growth of Diatom Synedra Acus and Morphology of Its Silica Valves

Basharina

Danilovtseva

Zelinskiy

et al. 2012

Silicon

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The effect of three Group IV metals (titanium, zirconium and tin) on the growth, morphology and chemical composition of the freshwater diatom Synedra acus subsp. radians (Kützing) Skabichevsky was studied and compared with germanium. The elements in their highest oxidation states were introduced into the culture medium in the form of hydroxides. Germanium was found to be toxic at ≥5 mol. % of the total Ge-Si content in the culture medium. In the presence of other elements, a slight decrease in the cell division rate was observed independent of the element within 1-15% content interval. The analysis of the obtained biomass and silica valves revealed the presence of all the added elements within the cells. However, only germanium was incorporated into the valves in considerable amounts. S. acus cultivation with the addition of 5% Group IV elements resulted in cells having the following aberrations in the structure of the silica valves: changes in valve shape, thickening of valves, alterations of the areolae rows, irregularity or absence of the areolae and a decrease in the mechanical strength of valves. Moreover, the effect of Group IV elements on silica formation was simulated in vitro using a synthetic polymer bearing polyamine and phosphate groups found in silaffines (proteins from Electronic supplementary material The online version of this article (diatom frustules). The studied elements were observed to provoke the formation of unstable silica particles in solution. We propose that the observed effects of germanium, titanium, zirconium and tin on diatom growth and structure are due to uncontrollable silica condensation.

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“…Condensation of monomer silicic acid proceeds via intermediate formations of organic-silicon nanoparticles in presence of poly(allylamine) [224], poly-(1-vinylimidazol) [225]. In nature these processes happen under impact of biosiliconized organisms, diatoms and sponges, which produce more than 20 % of photo-synthetic oxygen.…”

Section: Biomineralization and Bioconcentrationmentioning

confidence: 99%

Bionanocomposites Assembled by “From Bottom to Top” Method

Pomogailo

Джардималиева

2014

Nanostructured Materials Preparation via Condensation Ways

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Particles, which take part in different biological processes, have a special place in nanometer composites. Rich and variable biochemistry of proteins displays key importance of a nanometer phenomenon for a working mechanism of living organisms [1,2], and this provides a wide range of possibilities for development of new types of hybrid nanomaterials with constructible structures, functions and shapes [3][4][5].Integration of nanoparticles and biomolecules, each having unique properties, on the one hand, and being in the same nanometer scale (enzymes, antigens, and antibodies of typical sizes 2-20 nm like nanoparticles), on the other hand, as of two structurally compatible classes of materials, gives resultant new hybrid nanomaterials with synergetic properties and functions (Fig. 7.1).Interaction of nanoparticles with biopolymers (proteins, nucleic acids, polysaccharides) plays very important role in enzyme catalysis, biosorption, biohydrometallurgy, geobiotechnology, etc.). There is a great interest to nanomaterials, which can be used in biomedical and pharmaceutical applications due to their biocompatibility and biodegradation. At the same time bionanocomposites should meet some demands to plasticity of a matrix, they should have improved barrier, antimicrobial properties, ability to controlled release of bioactive substances such as antimicrobial agents, antioxidants, drugs, calcium compounds in biologically available form and their mixtures, etc. Biopolymers, such as natural and synthetic proteins, obtained by chemical methods or by genetic modification of microorganisms or plants, nucleic acids (including synthetic ones), biodegraded complex polyethers, such as polylactic acid, and its derivatives, oligo-hydroxyalkanoate, most often, polyhydroxybutyrate, their copolymers, biomedical materials, such as hydroxyapatites, are used. There is an interesting group of materials for this purpose including synthetic and natural (vegetable and animal) polysaccharides, such as cellulose and its derivatives, alginates, dextranes, acacia gum, chitosan, and any of its natural and synthetic derivatives, especially chitosan acetate, and proteins obtained from raw animal materials, as well as proteins from maize (especially zein) or soya, gluten derivatives, gelatin, casein, etc. Relatively widely used in

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Controlled stabilisation of silicic acid below pH 9 using poly(1-vinylimidazole)

Cited by 32 publications

References 21 publications

Silicic acid condensation under the influence of water-soluble polymers: from biology to new materials

Silicic acid condensation under the influence of water-soluble polymers: from biology to new materials

The Effect of Titanium, Zirconium and Tin on the Growth of Diatom Synedra Acus and Morphology of Its Silica Valves

Bionanocomposites Assembled by “From Bottom to Top” Method

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