Conformation of ionogenic macromolecules adsorbed on the surface of particles of polysilicic acid sols

Yermakova, L.N; Aleksandrova, T. A.; Nuss, P. V.; Vasserman, A. M.; Kasaikin, V.A.; Зезин, А. Б.; Kabanov, V.A.

doi:10.1016/0032-3950(85)90488-5

Cited by 6 publications

(5 citation statements)

References 5 publications

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“…Silica nanoparticles can react with polymeric bases and cations via surface silanol groups. − This reaction obeys the laws of cooperative interpolymer reactions and gives immediate precipitation or stable solutions depending on the nature and chain length of the organic polymer, pH, ionic strength, and so on. In the case of the PVA–Si(OH) 4 system, condensation proceeds over hours (sometimes days) after starting the reaction.…”

Section: Resultsmentioning

confidence: 99%

Poly(vinyl amine)–Silica Composite Nanoparticles: Models of the Silicic Acid Cytoplasmic Pool and as a Silica Precursor for Composite Materials Formation

et al. 2011

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The role of polymer (poly(vinylamine)) size (238-11000 units) on silicic acid condensation to yield soluble nanoparticles or composite precipitates has been explored by a combination of light scattering (static and dynamic), laser ablation combined with aerosol spectrometry, IR spectroscopy, and electron microscopy. Soluble nanoparticles or composite precipitates are formed according to the degree of polymerization of the organic polymer and pH. Nanoparticles prepared in the presence of the highest molecular weight polymers have core-shell like structures with dense silica cores. Composite particles formed in the presence of polymers with extent of polymerization below 1000 consist of associates of several polymer-silica nanoparticles. The mechanism of stabilization of the "soluble" silica particles in the tens of nanometer size range involves cooperative interactions with the polymer chains which varies according to chain length and pH. An example of the use of such polymer-poly(silicic acid) nanoparticles in the generation of composite polymeric materials is presented. The results obtained have relevance to the biomimetic design of new composite materials based on silica and polymers and to increasing our understanding of how silica may be manipulated (stored) in the biological environment prior to the formation of stable mineralized structures. We suspect that a similar method of storing silicic acid in an active state is used in silicifying organisms, at least in diatom algae.

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Section: Resultsmentioning

confidence: 99%

Poly(vinyl amine)–Silica Composite Nanoparticles: Models of the Silicic Acid Cytoplasmic Pool and as a Silica Precursor for Composite Materials Formation

et al. 2011

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“…Interaction between growing PSA nanoparticles and macromolecular chains oen results in stable soluble nanoparticles 63,64,85,[90][91][92][93]95,96,115,116,120,131,132 or in a product consisting of uniform spherical composite particles. 24,61,62,[65][66][67][68][69][70][71][75][76][77]98,99,[106][107][108]111,112,114,117,121,124,134,135,137,139,143,149,153,155,157 These variants exist in the case of relatively low silicon content in the system, when all PSA nanoparticles can nd chains of organic polymer.…”

Section: Polymer : Si Ratiomentioning

confidence: 99%

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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“…According to [13][14][15][16] the mechanism of interaction of silicate sols with linear polyelectrolytes can be considered as cooperative adsorption of negatively charged SiO 2 nanoparticles onto positively charged polyelectrolytes ( Figure 2). The addition of a polycation to a solution of a silicate ions results in precipitation of IPEC.…”

Section: Resultsmentioning

confidence: 99%

“…Classification of polymer/silicate nanocomposites based on synthetic techniques was suggested in [8]. Although titanium [9,10] and aluminum [11] oxides have been utilized as the inorganic components interacting with functional polymers, the colloid silica due to easy preparation by sol-gel technology [12] is one of the promising inorganic polymeric materials that interacts with polyelectrolytes and forms, so called interpolyelectrolyte complexes (IPEC) -products of interaction of two oppositely charged polyelectrolytes [13][14][15][16][17] Abstract. Interaction between anionic (and cationic) colloidal particles of silica having the particles diameters 12 and 22 nm with synthetic cationic (and anionic) polyelectrolytes of various nature and structure was studied by potentiometric, conductimetric spectroturbidimetric and viscometric methods in aqueous solution.…”

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confidence: 99%

Hybrid inorganic-organic nano- and microcomposites based on silica sols and synthetic polyelectrolytes

Kudaibergenov¹,

Tatykhanova²,

Arinov³

et al. 2008

Express Polym. Lett.

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Hybrid inorganic-organic nanocomposites comprising inorganic nanoparticles and functional polymers are novel and unique class of nanomaterials that synergistically combine and enhance the best properties of inorganic and organic polymers [1][2][3][4]. The potential application fields of such hybrids can include specialty coatings, membranes, sensors, biomaterials, drug delivery systems, catalysts etc. The most common principle concepts of incorporation of inorganic nanoparticles into polymer matrix and the resulting properties of such materials have been reviewed by authors [5][6][7]. Classification of polymer/silicate nanocomposites based on synthetic techniques was suggested in [8]. Although titanium [9,10] and aluminum [11] oxides have been utilized as the inorganic components interacting with functional polymers, the colloid silica due to easy preparation by sol-gel technology [12] is one of the promising inorganic polymeric materials that interacts with polyelectrolytes and forms, so called interpolyelectrolyte complexes (IPEC) -products of interaction of two oppositely charged polyelectrolytes [13][14][15][16][17] Abstract. Interaction between anionic (and cationic) colloidal particles of silica having the particles diameters 12 and 22 nm with synthetic cationic (and anionic) polyelectrolytes of various nature and structure was studied by potentiometric, conductimetric spectroturbidimetric and viscometric methods in aqueous solution. It was shown that the complexation of silica nanoparticles with linear polyelectrolytes leads to formation of mostly stoichiometric interpolyelectrolyte complexes (IPEC) which precipitate from aqueous solution. Casting of water-soluble IPEC followed by thermal treatment gives thin composite films insoluble in water while 'layer by layer' (LbL) deposition of polyelectrolyte components onto silica sols leads to formation of multilayered nano-and microcomposites. The possible mechanism of formation of LbL multilayers consisting of silica sol (SiO2) 'cores' and polyethyeleneimine-polyacrylic acid (PEI-PAA) 'shells' was suggested. It was found that in diluted aqueous solution the radius of gyration, Rg and hydrodynamic radius, Rh mean of LbL particles are independent on LbL concentration and smaller than 100 nm. The zeta potential values of LbL particles are arranged between -10 and -30 mV. The average size of LbL particles estimated by scanning electron microscopy (SEM) is in the range of 200-500 nm. Thermal treatment of LbL multilayers followed by etching of (SiO2) 'core' by HF leads to formation of a series of spherical nanocavities and blob-like microcavities. Vol.2, No.2 (2008) [101][102][103][104][105][106][107][108][109][110] Available online at www.expresspolymlett.com DOI: 10.3144/expresspolymlett.2008 Keywords: nanomaterials, silica nanoparticles, linear polyelectrolytes, interpolyelectrolyte complexes eXPRESS Polymer Letters Experimental MaterialsColloidal particles of silica are commercial products purchased from Ludox (Grace GmbH & Co. KG, Worms, Germany) were abbr...

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Conformation of ionogenic macromolecules adsorbed on the surface of particles of polysilicic acid sols

Cited by 6 publications

References 5 publications

Poly(vinyl amine)–Silica Composite Nanoparticles: Models of the Silicic Acid Cytoplasmic Pool and as a Silica Precursor for Composite Materials Formation

Poly(vinyl amine)–Silica Composite Nanoparticles: Models of the Silicic Acid Cytoplasmic Pool and as a Silica Precursor for Composite Materials Formation

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

Hybrid inorganic-organic nano- and microcomposites based on silica sols and synthetic polyelectrolytes

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