Studies in Social Science
Rozita Kaviani
Abstract
< p>Underground gas reserves in the form of hydrates are a huge source of energy that researchers are looking for ways to extract. The amount of hydrate gas reserves is estimated at more than 1016 cubic meters, which is more than the discovered sources of other fossil fuels, if only 15% of this ...
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< p>Underground gas reserves in the form of hydrates are a huge source of energy that researchers are looking for ways to extract. The amount of hydrate gas reserves is estimated at more than 1016 cubic meters, which is more than the discovered sources of other fossil fuels, if only 15% of this gas is extracted. But due to problems such as the slow rate of hydrate formation and the high pressure of its formation, his idea remained in the laboratory. After the discovery of hydrate self-preservation, this idea was raised more seriously and a lot of research was done on the use of hydrate for gas storage and transmission. High gas pressure is the most important negative factor in mass production of hydrates for gas storage and transport. The results showed that using these materials, methane hydrate is formed in much more suitable conditions than temperature and pressure. While the equilibrium pressure of methane hydrate formation at 293 ° K is about 34 MPa, with the addition of tetra-hydro-furan at a concentration of 2.5 mol%, this pressure is reduced to about 2.49 MPa, which shows a decrease of 92.6%. Also, at a pressure of 5 MPa, the equilibrium temperature of methane hydrate is about 278 degrees Kelvin, while at the same pressure, the fuzzy equilibrium temperature of a 6 mol solution of tetra-hydro-furan was about 306 degrees Kelvin.
Studies in Social Science
Frank Rebout; Rozita Kaviani
Abstract
Nowadays, scientists in physics, materials, etc. have come to the conclusion that if materials can be prepared in smaller proportions, the bonds that a small material makes with its surrounding phases are much stronger than larger scales. Nanocomposites were produced. In this type of composite material, ...
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Nowadays, scientists in physics, materials, etc. have come to the conclusion that if materials can be prepared in smaller proportions, the bonds that a small material makes with its surrounding phases are much stronger than larger scales. Nanocomposites were produced. In this type of composite material, at least one of the phases of the composite material is in nanometer dimensions. In the discussion of nanomaterials, nanocomposites have a special place. These materials have two or more nanometer components. The presence of particles and fibers in the structure usually creates strength in the substrate. In fact, when particles or fibers are distributed within a substrate, the forces applied to the composite are uniformly transmitted to the particles or fibers. Particles or fibers that are distributed within a substrate are called fillers. Properties such as strength, hardness, physiological properties, and porosity change with the distribution of fillers within the substrate. The substrate can hold the particles apart in such a way that crack growth is delayed. In other words, with proper distribution of fillers in the background material, the crack growth path in the background becomes longer and therefore crack growth is delayed. In addition, the components of nanocomposites have better properties due to the surface interaction between the substrate and the filler. The type and amount of these interactions play an important role in the various properties of nanocomposites such as solubility, optical properties, electrical and mechanical properties.
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