Chapter 210 Elastic Constants of Two-Dimensional Materials

Currently there are two most widely used methods in computational materials science.

The first is to combine experimental data, establish a mathematical model and then perform numerical calculations to simulate and reproduce the actual process, and then repeatedly revise the previous mathematical model to achieve a certain physical explanation, focusing on experimental research and applicability.

The second is computational simulation, which refers to predicting, designing or modifying the material structure and performance directly through theoretical models and numerical calculations for specific materials, specific physical mechanisms or reaction mechanisms, focusing on theoretical research and predictability.

When Wu Bin was reading literature before, he read an article on calculating the elastic constant of two-dimensional materials. The content was that the energy-volume curve was used to fit it.

Their laboratory used IBRION=6 and ISIF=3 to calculate the elastic constant of two-dimensional materials, but after reading this, Wu Bin found that graphene’s elastic constant has too many units. Some literature assumes that the effective thickness of graphene is 0.34 nanometers. Young's modulus is about 1TPa.

But there are also second-order reciprocals like 60eV, 345N/m, 350GPa*nm, etc.

Therefore, calculating the elastic constant of two-dimensional materials has become a new topic for Wu Bin. Although on the surface, this research cannot help him solve the mass production problem of graphene.

But he firmly believes that as long as he knows more about two-dimensional materials, there will eventually be a shining point that can become the basis of his theory.

In addition, Lin Ziqi has also gained a lot this month. I don't know whether it is because her theoretical foundation has reached saturation, or because she has been influenced by Wu Bin for a long time, and her experimental skills have suddenly improved in a breakthrough way.

For example, the night before yesterday, she excitedly called Wu Bin to the laboratory, and turned a picture into a sound signal on the spot, and then added it to an oscilloscope to display the picture on the oscilloscope.

After reading it, Wu Bin nodded affirmatively and commented, "If it were 80 years ago, you would definitely be a talented person in building televisions."

His words were not an encouraging compliment, but he really felt that Lin Ziqi was able to demonstrate the principles of a television using the simplest old-fashioned electronic oscilloscope equipment, which can be said to be quite impressive.

Lin Ziqi, who was praised, also seemed very happy,

After hearing about it the next day, Feng Jinhui said: "The laboratory has always been a place where you can find out what people are suitable for. With Xiao Lin's hands-on ability, it would be a pity not to study engineering. Of course, there is no problem in doing theory."

It can be said that this incident greatly stimulated Lin Ziqi's enthusiasm for scientific research, and she went to the library much earlier in the morning.

Because the total funding for Professor Liu's project is quite sufficient, Wu Bin only needs to apply for some small research funding from Feng Jinhui when studying graphene. What stands out is that he is a very wealthy person!

Of course, this is all earned by Professor Liu’s accumulation of credibility over many years. As for what credibility is? That is, if you give money and you can give something, this is credibility!

You must know that there are many experimenters all over the world who are running away for funds. They have not done many experiments all year round, and they are just talking to various investors. It can be said that it is really difficult for a man with a science degree to do this. .

Moreover, Professor Liu also told him that starting from the next semester, if he joins any tutor's project, he will be able to get a salary, and it will not be a dead salary, it will be determined according to the workload.

At present, 15% of the application project funds of major universities are usually used as labor fees for graduate students. For example, if your total funding reaches 800,000, 120,000 of them will be labor fees for graduate students. Of course, this money will be used in the end. The boss has the final say on how to allocate it.

If you were an ordinary undergraduate, you would basically be treated as a handyman and be paid monthly. As for the amount... I'm embarrassed to say, it's just a meal allowance at most.

However, Wu Bin is a bit special. His knowledge range is so extensive that one person is an army, and his enthusiasm for scientific research is extremely high. For some experiments that do not require the collection of large amounts of data, he really does not need any helpers and can completely handle it himself.

Wu Bin, who was involved in the new experiment, immediately entered a mindless mode. His mind was filled with experimental data. It wasn't until ten o'clock in the evening that he was so hungry that he couldn't concentrate, so he rubbed his eyes and soaked a bowl of shrimp and fish noodles.

While eating noodles, Wu Bin took a look at his phone and found that Pei Jiamin had sent him a message on WeChat at noon.

[Congratulations, why don’t you mention such a big thing as publishing "Science" to the classmate group? Isn’t it too outsider? 】

After reading this, Wu Bin took a sip of instant noodles and replied.

【low profile. 】

After sending it, I was about to put down my phone, but found that Pei Jiamin had replied instantly.

【You are too low-key! 】

[Do you know how I feel about the fact that I only found out about you publishing "Science" through my dad...]

Bad guy: [Hmm...how are you feeling? 】

Pei Mimi: [……]

[Cheers to our fake friendship. 】

Bad person: […]

【Not that much...】

Pei Mimi: [Shouldn’t things worth celebrating be shared with friends? 】

Bad guy: [Okay, it’s my fault. I’ll let you know next time. 】

Pei Mimi: [A top student is a top student. Are you planning to publish "Science" next time? 】

Seemingly satisfied with Wu Bin's attitude of admitting his mistake, Pei Jiamin stopped pursuing the matter and started joking.

Bad person: [It is also possible to publish "nature"~]

Pei Mimi: [It's amazing, to be honest... In fact, after my dad told me about "Science", I searched it and found out what level of journal it was. Do you think you will become a great scientist in the future? 】

Bad guy: [Who knows what will happen in the future, but I should probably continue on the road of scientific research. 】

Pei Mimi: [Well, I should also continue on the path of medicine. 】

Bad guy: [Come on, I believe I will see your article in "cell" one day. 】

Pei Mimi: [Don’t dare to think about it, don’t dare to think about it. 】

[Then I’ll go to bed first, and don’t work too hard. 】

Bad guy: [Okay, good night. 】

Putting down his mobile phone, Wu Bin started eating noodles to save energy for the whole night.

…

On Monday, Wu Bin went back to his dormitory to take a shower. As he approached the door, he heard a sound similar to a guitar, but somewhat different.

Opening the door, Wu Bin glanced at the dormitory and immediately discovered the source of the sound, Li Yan holding a small guitar.

"Huh!? When did you learn to play the guitar?" Wu Bin asked in surprise.

"I just learned it." Li Yan played a note, "Also, please don't be such an amateur. This is called a ukulele, not a guitar."

"Ukulele...? No wonder the sound is different." Wu Bin said while looking for a change of underwear.

"Yes, although they look very similar, they are actually two musical instruments with completely different styles. I will play you a song called "Castle in the Sky" that I just learned. Listen."

PS: I’ll add an update to Brother Erha’s reward, thank you for your support~