Synthesis and features of formation of hydrated oxides at the nanoscale level

Title : Synthesis and features of formation of hydrated oxides at the nanoscale level

Abstract:

Formation of nanoscale particles (NSP) with controlled properties complicated insufficient study of the processes of nucleation and growth of particles of different chemical nature, their structuring at separate stages of formation. Disclosure of the process of formation of a solid at the phase formation stage (nucleation at the nanoscale level) is most significantly, since the processes occurring at this stage predetermine the structure and properties of the solid. At the nanoscale level, the formation of materials is subject to the same fundamental laws of structure formation, which is important both for understanding effective, purposeful management of changes in the composition, size and morphology of the NSP and for obtaining multifunctional composite materials with the required characteristics.

Present study aims to establish correlations between the conditions of preparation, composition, structure, dispersion, morphology and properties of oxide nanosystems at all stages of their phase formation, starting with the formation of hydrosols and suspensions of hydrated oxides from salt solutions.

In this work theoretical issues and experimental results of the investigation of the formation of the solid phase of hydrated oxides at the nanoscale level in different oxides systems are considered. The research systems have been received by solgel method (systems SiO2 ? H2 O, AlOOH, FeOOH, NaX), as well as by hydrothermal synthesis (nanotube of chrysotile [Mg3 Si2 O5 (OH)4 ], synthetic montmorillonite (Na, Ca)0.3(Al, Mg)2 Si4 O10(OH)2 ? nH2 O). Based on experimental research the evolutionary models of formation of particles of hydrated oxides at the nanoscale level are proposed. She includes the following stages: hydrolysis of aquaions, their polycondensation with the formation of polymer hydroxocomplex, the formation of the fetus, their further increase, aggregation and crystallisation. The most effective nanoscale additives for hydration-synthesis (cement) and hydrothermal-synthesis (silicate) hardening systems can be the SiO2 · H2 O system and chrysotile nanotubes, since they have a related crystal-chemical structure with new growths of the solid phase of building composites.

Audience Take Away:

• Theoretical issues and experimental results of the investigation of the formation of the solid phase of hydrated oxides at the nanoscale level in different oxides systems are considered.
• The evolutionary models of formation of particles of hydrated oxides at the nanoscale level are proposed.
• The results of this research can be useful research fellow and specialists working in the field of material science, construction of the composites and products, as well as in their research and scientific activity.

Biography:

Olga V. Artamonova studied Chemistry at the Voronezh state university, Voronezh, and graduated as MS in 2001. In 2004 she defended her thesis for the Degree of Chemistry Candidate of on the theme «Synthesis of nanoceramic materials based on zirconium dioxide stabilized with indium oxide» and received her PhD degree. From 2004 she works in Voronezh state technical university (VSTU). From 2006 up to she is Associate Professor of department of chemistry and chemical technology of materials of VSTU. Between 2010 and 2013 she trained in full-time Doctoral studies of VSTU. She has published more 120 scientific publications, including 3 monographs, and 25 teaching materials, including 10 training manual. Scientific activities are synthesis nanostructures and nanotechnology of inorganic hardening systems and composites, as well as elaboration of nanoadditives for modification of structures of construction composites.