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