Synthesis of High-Purity Silica Nanoparticles by Sol-Gel Method

Lazareva, S. V.; Shikina, N. V.; Tatarova, L.E.; Ismagilov, Z. R.

doi:10.18321/ectj677

Cited by 21 publications

(17 citation statements)

References 32 publications

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“…The Stöber method is still widely used in various modifications to produce particles with a diameter from tens of nanometers to several micrometers. Variation of the synthesis conditions (catalyst type, process temperature, and the ratio of the initial reactants) allowed one to synthesize silica sols with the particle size of 12-150 nm and high resistance to agglomeration [33]. The smallest non-agglomerated nanoparticles obtained by the Stöber The particles (II) and (IIa) had a diameter of 40-700 nm and larger negative zeta potential (due to the presence of the SH groups) compared to the particles obtained by hydrolysis of tetraethoxysilane alone.…”

Section: Methodsmentioning

confidence: 99%

Methods of the Synthesis of Silicon-Containing Nanoparticles Intended for Nucleic Acid Delivery

Левина¹,

Репкова²,

Ismagilov³

et al. 2018

Eurasian Chem. Tech. J.

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A promising new approach to the treatment of viral infections and genetic diseases associated with damaged or foreign nucleic acids in the body is gene therapy, i.e., the use of antisense oligonucleotides, ribozymes, deoxyribozymes, siRNA, plasmid DNA, etc. (therapeutic nucleic acids). Selective recognition of target nucleic acids by these compounds based on highly specific complementary interaction can minimize negative side effects, which occur with currently used low molecular weight drugs. To apply a new generation of therapeutic agents in medical practice, it is necessary to solve the problem of their delivery into cells. Silicon-containing nanoparticles are considered as promising carriers for this purpose due to their biocompatibility, low toxicity, ability to biodegradation and excretion from the body, as well as the simplicity of the synthesis and modification. Silicon-containing nanoparticles are divided into two broad categories: solid (nonporous) and mesoporous silicon nanoparticles (MSN). This review gives a brief overview of the creation of mesoporous, multilayer, and other silicon-based nanoparticles. The publications concerning solid silicon-organic nanoparticles capable of binding and delivering nucleic acids into cells are discussed in more detail with emphasis on methods for their synthesis. The review covers publications over the past 15 years, which describe the classical Stöber method, the microemulsion method, modification of commercial silica nanoparticles, and other strategies.

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Section: Methodsmentioning

confidence: 99%

Methods of the Synthesis of Silicon-Containing Nanoparticles Intended for Nucleic Acid Delivery

Левина¹,

Репкова²,

Ismagilov³

et al. 2018

Eurasian Chem. Tech. J.

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“…Various methods have been adopted to synthesize CdO nanoparticles (4,5) to use them in technological (6) applications. Among the synthesis procedures the sol-gel process is advantageous for its low cost, (7) simple method and produces highly pure (8) size controlled nanoparticles.…”

Section: Introductionmentioning

confidence: 99%

Removal of defects in CdO nanoparticle and rapid synthesis of CdO nanoflake using novel microwave technique to improve semiconductor device performance

Das¹

2021

IJST

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Objective: The objective of this study is to synthesize CdO nanoparticle and nanoflakes both in a single way. Also the purpose of removing defects from semiconductor nanoparticles has been considered. Methods: Very small sized Cadmium oxide nanoparticles (11 -29 nm) and nanoflakes of average size 70 nm were prepared by sol-gel process. Two solutions of 0.2M CdCl 2 and 0.2M NaOH were used with a mixture of 1:2 ethylene glycol and methanol. Two different heating method of dried precipitate was adopted to observe the morphology and defect characteristics. Half of the precipitate was annealed in furnace and rest half in domestic microwave. Findings: The fcc (NaCl-type) structure has been found in the nanostructures with lattice constant varying with annealing temperature. We propose a linear relation for the change in lattice constant. HRTEM pictures show nanoflakes and hexagonal nanoparticles. The ratio curve of coincidence Doppler broadening spectroscopy (CDBS) found defect concentration reduction and agglomeration effect on microwave irradiation in place of furnace annealing. It indicated reduction of defects inside the nanoparticles. The S and W parameter revealed the chemical surroundings and momentum distribution of the vacancy clusters varying with crystallite size. Novelty: Furnace annealing and microwave irradiation showed different effect of surface strain on lattice. Microwave irradiation has been used to reduce defects inside CdO nanocrystals for potential application and coincidence Doppler broadening spectroscopy showed potential to be a very effective tool of defect characterization and electron momentum comparison. Also, this work presents how microwave radiation can be used to prepare nanoflakes and nanoparticles from same reactants without any substrate.

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“…The most recent literature indicates the availability of a wide range of nanosilica synthesis techniques [20]. Spherical silica nanoparticles as uniform particles from 5 nm to several microns can be synthesized [21], among others, by using the following methods: the sol-gel process [22,23], the hydrolysis of tetraethyl orthosilicate (TEOS) in an ethanol medium [24], wet chemical synthesis [25], flame spray pyrolysis [26], the low-temperature vapor-phase hydrolysis of SiCl4 [27], water-in-oil microemulsion [28], and microwave synthesis [29]. The choice of the synthesis method determines the basic parameters of the obtained silica nanoparticles (especially particle-size distribution and shape).…”

Section: Introductionmentioning

confidence: 99%

Antibacterial Fibers Containing Nanosilica with Immobilized Silver Nanoparticles

Śmiechowicz

Niekraszewicz

Strzelinska

et al. 2020

Autex Research Journal

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The main aim of the presented research was to obtain antibacterial fibers containing nanosilica with immobilized silver nanoparticles. The nanomodifier in an amount of 250 ppm, 500 ppm, 1,000 ppm, and 2,000 ppm were introduced into the cellulose fiber matrix during the cellulose dissolution process. In order to assess the influence of the nanomodifier's amount in the fiber on the antibacterial activity of modified fiber, a quantitative test of the antibacterial activity of the fibers was performed. The basic parameters of modified fibers, such as the mechanical and hygroscopic, were estimated. The size and shape of the nanomodifier in the selected fibers, as well as microanalysis of the polymer matrix, were examined. The investigations were conducted by Scanning Electron Microscopy (SEM), Transmission Electron Microscopy (TEM), and Energy Dispersive Spectrometry (EDS). The obtained results allowed the selection of optimal fibers with strong antibacterial properties that can be potentially used for personal protection or medical purposes.

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Synthesis of High-Purity Silica Nanoparticles by Sol-Gel Method

Cited by 21 publications

References 32 publications

Methods of the Synthesis of Silicon-Containing Nanoparticles Intended for Nucleic Acid Delivery

Methods of the Synthesis of Silicon-Containing Nanoparticles Intended for Nucleic Acid Delivery

Removal of defects in CdO nanoparticle and rapid synthesis of CdO nanoflake using novel microwave technique to improve semiconductor device performance

Antibacterial Fibers Containing Nanosilica with Immobilized Silver Nanoparticles

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