Young's modulus ≥ 2.1 TPa, breaking strength ≥ 80N/m …
Looking at the series of parameters given, the first thing that Lu Zhou thought of was a cable with high tensile strength. Then, he thought of impact-resistant coatings used on cars or aerospace equipment.
As for where this thing could be used …
There were many uses for it.
If it was made into a cable, it could be used on the space station as a traction rope to fix the heat sink and solar panels. On the ground, it could be used as a suspension material for engineering equipment. In the sea, it could be used as a blocking rope on the deck of an aircraft carrier.
This was especially true for the latter, which was extraordinarily expensive.
And these were only one of the uses of this material.
Lu Zhou believed that once this material with high Young's modulus and high breaking strength came out, countless people would be able to think of uses for him.
Back to the research itself.
For the technical standards given by the system, the best option that Lu Zhou could think of was a carbon-based material with high tensile strength, light weight, and strong plasticity.
Especially a series of graphite-derived reinforced composites such as carbon fiber.
Not only did this material have a broad theoretical imagination, but it was also his specialty in the field of computational materials science. When he first started his computational materials science research, he started with carbon materials.
Therefore, this task was not difficult at all for him.
It was like giving it to him for free!
After leaving Professor Wang Qingping's laboratory, Lu Zhou did not stay at the Jinling Institute for Advanced Study for long. Instead, he went straight home.
When he was modifying the mathematical model according to the experimental results, he suddenly had some ideas about computational materials science in his mind.
Perhaps it was because he had reached level 10 in both mathematics and physics, Lu Zhou discovered that his sensitivity to numbers and physical phenomena had reached a state of perfection.
Even if it was only a small clue that was almost negligible, it could be infinitely magnified in his eyes, turning into a key that could be touched by both hands.
Regardless of where this inspiration came from, there was only one thought in his mind at this moment.
That was to record this inspiration before it dissipated.
He went upstairs to the study room and asked Xiao Ai to make him a cup of coffee. Lu Zhou sat at the desk and spread the draft paper he brought back from the lab on the table.
"According to the experimental process designed according to the original model, the density of material A is low. After deposition, it forms a fluffy mass, and the diameter of the carbon nanotubes is extremely uneven …"
"The reason for this should be that the free radical polymerization of the monomer acrylonitrile is not sufficient, resulting in the formation of a large number of intermediate products, resulting in the insufficient third-stage reaction … Finally, the formation of the foam-like mixture."
"Tsk tsk, interesting."
What piqued Lu Zhou's interest was not the foam-like mixture, but some very interesting phenomena that he discovered when he was revising the calculation model.
After thinking for a while, he picked up a pen and wrote a line of words on a blank piece of draft paper.
[Implicit density functional method]
Looking at this line of inspiration that was refined into words, Lu Zhou couldn't help but smile.
Generally speaking, when a difficult problem was clearly written down, it was already half solved.
At least, this was the case for him!
The so-called implicit functional density was a computational materials science method relative to explicit functional density. It was a relatively popular research direction in the theoretical research field of computational materials science.
It was well known that the traditional commutation correlation energy functional was an explicit functional directly expressed by the electron density function, and the Kohn-Shan orbital wave function as a direct variable was an implicit functional.
The simplest implicit functional was the Fock commutation energy, which was often referred to as the exact correlation in the context of density functional theory.
For molecular systems, the use of implicit functional could achieve the accuracy of second-order many-body perturbation theory with a relatively small amount of computation. Therefore, the implicit density functional method was widely regarded as a computational materials science research method with broad prospects.
However, although it had such advantages, its shortcomings were also obvious. For example, the accuracy was limited, such as the inability to accurately describe van der Waals interactions, etc., which was almost fatal for the study of solid materials.
Therefore, the implicit density functional method was relatively rarely used in the study of solid materials, and it had only made some progress in certain fields … Moreover, this was when computing power had been greatly developed.
So far, the implicit correlation functional based on the adiabatic correlation fluctuation dissipation theorem had attracted widespread attention in the academic community. It was widely regarded as a breakthrough to overcome the shortcomings of implicit functional density.
However, the problem of this kind of functional was not small, especially the huge amount of computation. Even the most powerful traditional computers would find it difficult to solve. Therefore, the current research direction was still in the exploratory research of simple systems.
What Lu Zhou wanted to do now was to extend this method from simple systems to relatively complex carbon materials!
Once this research was successful, it would be of great help to the entire research field of carbon composite materials. Its significance would even surpass the "Young's modulus ≥ 2.1TPa, breaking strength ≥ 80N/m …" material he was working on!
Lu Zhou didn't stop writing at all. After he finished writing the title, he quickly delved into the proposition itself.
[According to the H-K theorem, the ground-state energy functional of the system can be expressed as: EG {P (r)} = E {P (r)} + VV (r) ρ (r) drdr …]
[And the functional E {P (r)} can be expressed as: E {P (r)} = T {ρ (r)} + 1/2E {ρ (r) {ρ (r) drdr + Exc {P (r)}} …]
[…]
Lines of calculations flowed out from the tip of the pen like a trickling stream, converging into a river with the burst of inspiration, rushing into the sea!
At this moment, all the inspirations related to matter were woven into a language that could be recited by the visible numbers.
Under the shroud of this giant net, all the forces and physical properties were included in it. They were all abstracted into mathematical language by the rigorous logic and answered by mathematical methods!
"Then, it's time to introduce the Shrodinger equation —"
The tip of the pen that was pinched by Lu Zhou's fingertips was like a sharp dagger, drawing a sonorous and powerful trajectory on the paper. At the same time, it also pierced through the thick fog that covered the end of the maze.
Lu Zhou's pupils became brighter and brighter, and his slightly furrowed eyebrows finally relaxed.
Even though there was still a long way to go from the end …
His scientific intuition told him that he was very close to the end!
Time quickly passed by.
The sun gradually moved from the sky to the corner of the sky.
The sky outside the window finally became completely dark, and the street lights on both sides of the tree-lined trail began to light up. Lu Zhou finally raised his head and took a long breath. He put down the pen in his hand.
"… The implicit density functional method also has broad prospects for the research of carbon composite materials. At least for now, it has been promoted in this field.
"At the same time, this can also be regarded as a breakthrough to promote the method from a simple system to a complex system.
"Even though there is still room for further exploration.
"But for the time being, let's stop here."
After that, Lu Zhou smiled with some satisfaction and put the pen in his hand aside.
Almost at the same time he put down the pen, a line of light blue text unexpectedly appeared in front of him.
At first, Lu Zhou thought he was seeing things. He blinked subconsciously.
However, that line of light blue text did not dim because of his blinking. It was still so clear that it could not be ignored …
[Congratulations, User, for mission completion!]
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