Sintering and properties of composite materials ZrO2—Al2O3 with sodium silicate liquid phase

2019 ◽  
Vol 0 (6) ◽  
pp. 32-36 ◽  
Author(s):  
Valeriy Smirnov ◽  
◽  
Sergey Smirnov ◽  
Tatiana Obolkina ◽  
Olga Antonova ◽  
...  
Keyword(s):  
Composite Materials ◽  
Liquid Phase ◽  
Sodium Silicate ◽  
Silicate Liquid

scholarly journals Distribution of Sodium and Diffusion Mechanism in Sodium Silicate Liquid

2019 ◽  
Vol 35 (3) ◽  
Author(s):  
Nguyen Thi Thanh Ha
Keyword(s):  
Distribution Function ◽  
Sodium Silicate ◽  
Structural Characteristics ◽  
Diffusion Mechanism ◽  
Silicate Liquid ◽  
Parallel Processes ◽  
Resident Time ◽  
Simulation Results ◽  
The One ◽  
And Diffusion

Molecular dynamic simulation is employed to study the structural properties and diffusion mechanism in sodium silicate (Na2O.4SiO4). Structural characteristics are clarified through the pair radial distribution function, distribution of SiOx coordination units, network structure. The simulation results reveal the structure of Na2O.4SiO4 liquid consists of one Si-O network that is mainly formed by SiO4 units. The spatial distribution of sodium is non-uniform; sodium tends to be in the non-bridging oxygen-simplexes and in larger-radius simplex. Moreover, the sodium density for non-bridging oxygen region is significantly higher than the one for other region. Further, we find that Si and O diffuse by bond break-reformation mechanism, while the motion of Na consists of two parallel processes. Firstly, Na atoms hop from one to another O within a disordered network where each bridging oxygen (BO) has one site, while a non-bridging oxygen (NBO) possesses two sites. The average resident time for Na staying near NBO is much longer than that near BO.

Effect of Alkali on the Geopolymer Strength

2010 ◽  
Vol 168-170 ◽  
pp. 1827-1832 ◽  
Author(s):  
Ting Sheng Qiu ◽  
Jing Zhong Kuang ◽  
Fang Shi
Keyword(s):  
Liquid Phase ◽  
Sodium Silicate ◽  
Sodium Silicate Solution ◽  
Silicate Solution ◽  
Alkali Solution ◽  
Raw Material ◽  
Alkali Activator ◽  
Content Ratio ◽  
And Tungsten ◽  
Trigger Action

In this study, geopolymer was synthesized with metakaolin and tungsten-tailing as the main raw material and alkali activator composed of sodium silicate solution and alkali solution. By the contrast of the experiments with five kinds of alkali activators, the result was obtained. When the concentration of the NaOH or KOH was 10mol/L,the content of NaOH or KOH in the liquid phase was 35%,while the concentration of the Ca(OH)2was 3mol/L, the content in the liquid phase was 35%,the property of geopolymer was the best. For the combined alkali, when the content ratio of Ca(OH)2to KOH or Ca(OH)2to NaOH of 2:3,there was a balance between the activator of alkali and the resistance of Ca2+.The trigger action of the alkali activator on the activity of slag was accelerated.

Study on Influence Factors of Fly Ash and Metakaolin Based Geopolymer

2012 ◽  
Vol 538-541 ◽  
pp. 2322-2328 ◽  
Author(s):  
Jing Zhong Kuang ◽  
Xiang Chuan Zhao ◽  
Fang Shi ◽  
Hai Ying Cao
Keyword(s):  
Fly Ash ◽  
Liquid Phase ◽  
Sodium Silicate ◽  
Influence Factors ◽  
Solution Concentration ◽  
Organic Polymer ◽  
Liquid Ratio ◽  
Naoh Solution ◽  
Solid Liquid ◽  
Orthogonal Tests

Gepolymeric material is a new building material, which not only has the characteristics of organic polymer, ceramic and cement but also unique properties. The effects of four factors on the strength of fly ash and metakaolin based geopolymer were discussed with the orthogonal tests in this study, including fly ash content, NaOH solution concentration, solid-liquid ratio and the content of sodium silicate in the liquid phase. The results show that: content of fly ash 30%, NaOH solution concentration 12mol/L, solid-to-liquid ratio 4.5 and the content of sodium silicate in the liquid phase 65% is the best condition preparation of fly ash and metakaolin based geopolymer.

Inorganic Polymers Using Sodium Silicate Liquid Glass. Features of Silicate Polycondensation

2019 ◽  
Vol 13 (5) ◽  
pp. 849-852
Author(s):  
V. K. Skachkova ◽  
A. V. Grachev ◽  
A. Yu. Shaulov ◽  
A. A. Berlin
Keyword(s):  
Sodium Silicate ◽  
Liquid Glass ◽  
Inorganic Polymers ◽  
Silicate Liquid

Distribution of sodium and dynamical heterogeneity in sodium silicate liquid

2019 ◽  
Vol 33 (05) ◽  
pp. 1950013 ◽  
Author(s):  
N. T. T. Ha ◽  
N. V. Hong ◽  
P. K. Hung
Keyword(s):  
Sodium Silicate ◽  
Mobile Network ◽  
Nonbridging Oxygen ◽  
Silicate Liquid ◽  
Dynamical Heterogeneity ◽  
Cluster Function ◽  
Sodium Atoms ◽  
Simulation Results ◽  
The One ◽  
Dynamics Method

The structural and dynamical properties in sodium silicate liquid were investigated by molecular dynamics method. To clarify the distribution of sodium atoms in model, characteristics of simplex have been investigated. The simulation results reveal that Na2O⋅4SiO2 (NS4) liquid has a lot of simplexes with four sodium atoms inside but about half of simplexes do not have sodium. The spatial distribution of sodium is nonuniform, sodium tends to be in the nonbridging oxygen-simplexes and in larger-radius simplex. Moreover, the sodium density for nonbridging oxygen region is significantly higher than the one for Si-region. Namely, link-cluster function F[Formula: see text](r, t) has been used to clarify dynamical heterogeneity in NS4 liquid. The F[Formula: see text](r, t) for sets of random, immobile and mobile network atoms is quite different, which indicates that the dynamics of network atoms is heterogeneous. The Si–O network has the structure with two separated domains (immobile and mobile domains). These types of domain are significantly different in local microstructure, mobility of atoms and chemical composition.

scholarly journals Synthesis and properties of composite materials based on zinc oxide nanoparticles in an insulating matrix

Doklady BGUIR ◽  
2020 ◽  
Vol 18 (6) ◽  
pp. 25-32
Author(s):  
S. Y. Karankova ◽  
I. A. Tikhonov ◽  
E. B. Chubenko
Keyword(s):  
Zinc Oxide ◽  
Composite Material ◽  
Composite Materials ◽  
Sodium Silicate ◽  
Relative Intensity ◽  
Silicon Substrate ◽  
Zinc Oxide Nanoparticles ◽  
Initial Solution ◽  
Oxide Nanoparticles ◽  
Ph Values

A composite material based on zinc oxide nanoparticles synthesized by the chemical hydrothermal method and a polymer insulated matrix of sodium silicate was obtained. Free zinc oxide nanoparticles were formed by heating an equimolar solution of zinc nitrate and hexamethylenetetramine with different pH values (3–5). Nanoparticles were introduced into an aqueous sodium silicate solution and applied on a silicon substrate by centrifugation. Using scanning electron microscopy, we studied the structure and morphology of zinc oxide nanoparticles on a silicon substrate in unbound state and after their introduction into the sodium silicate matrix. It was found that the obtained particles have a hexagonal crystal lattice and a bimodal size distribution. After introduction in the matrix of sodium silicate, only smaller zinc oxide nanoparticles with an average diameter of 45 nm remain in it. Studying of the photoluminesclence spectra of a composite material, including zinc oxide nanoparticles obtained at different pH values of the initial solution, showed the presence of exciton and defectrelated photoluminescence bands with intensity’s maximums located at 383 and 590 nm, respectively. Zinc oxide nanoparticles in the stabilizing matrix of sodium silicate exhibit a higher relative intensity of exciton photoluminescence than unbound particles. The highest value of the relative intensity of exciton photoluminescence was achieved for a composite material including zinc oxide nanoparticles synthesized at pH=3,35 of the initial solution. The resulting composite materials can be used in optoelectronic and photovoltaic devices, and as an optical medium of non-cavity lasers.

Potential of Marine Clay as Raw Material in Geopolymer Composite

2012 ◽  
Vol 626 ◽  
pp. 963-966 ◽  
Author(s):  
S.M. Tamizi ◽  
Mohd Mustafa Al Bakri Abdullah ◽  
Kamarudin Hussin ◽  
Che Mohd Ruzaidi Ghazali ◽  
J. Liyana ◽  
...  
Keyword(s):  
Compressive Strength ◽  
Composite Materials ◽  
Sodium Hydroxide ◽  
Sodium Silicate ◽  
Early Time ◽  
Raw Material ◽  
Marine Clay ◽  
Alternative Materials ◽  
Alkaline Activator ◽  
Marine Clays

In this research, marine clays has been studied its potential as a matrix composite materials that tend to be used as alternative materials to concrete. The study shows that marine clays which mixed with appropriate proportion of alkaline activator could have strength requirements for masonry cement. The alkaline activator that been used for the geopolymerisation reaction is sodium silicate and sodium hydroxide. Its compressive strength in early time reached 9-15 MPa.

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