Chapter 100 How to solve the collapse curl caused by van der Waals force
After hanging up the phone, Xu Chuan quickly rushed to the materials research and development building.
As soon as I arrived at the building, I saw Senior Brother Fan Pengyue waiting downstairs.
Seeing him coming, the senior brother quickly greeted him with a bright and happy smile on his face.
"Junior brother, your previous speculation was correct. Through experiments, we found that the concentration of the hydrogen reducing agent was indeed too high and not the optimal ratio, so much so that it even interfered with the tungsten diselenide nanosheets to a certain extent. The generation of.”
"And the mathematical model you brought over the afternoon before yesterday has passed the calculation. You are really awesome. There were no problems at all in the test. It calculated all the data smoothly."
"More importantly, it directly helped us find the best experimental conditions, which saved us at least several months of time."
"Currently, the instructor is doing laboratory work, and the results will be out soon."
Xu Chuan nodded. He was not surprised by this result. The core mathematical formula was derived by him. As long as there is no problem with the code, then there will be no problem with the program.
The probability of code problems, based on the senior's level of care, is almost negligible.
The two came to the laboratory together, just as the experiment in the hands of the instructor was completed, and the experimental data had been transferred to the printing room.
"Xuchuan is here."
Seeing Xu Chuan, the instructor Chen Zhengping greeted him with a smile, and then said: "Thanks to you for this experiment, the previous analysis of the concentration of the hydrogen reducing agent and the establishment of the mathematical model helped us a lot, shortening the time by at least three days." More than four months."
"The students are of low ability, it would be great if they can help."
Xu Chuan subconsciously said something modest, causing the three senior brothers in the laboratory to roll their eyes.
A college student who can prove world-class mathematical conjectures, a genius who saves them months of experimental time in a few days.
Their abilities are still low, so what are they?
waste?
Or worse than waste?
Mmp, this beta is really not mellow at all.
Chen Zhengping, on the other hand, smiled and shook his head after hearing this and said, "You don't have to be so modest."
"But you came just in time. My experimental data has just come out. Please help me analyze it. I have a hunch that after optimizing the mathematical model this time, the tile formation rate of the new experimental tungsten diselenide nanosheets can reach 100%. More than eighty."
Xu Chuan nodded, he was also a little curious about how far this mathematical model could go.
Although the mathematical model of each experiment is different, some things are the same, just like the code of many software, you can ctrl c, ctrl v.
This thing is not only useful for his mentor's experiment, but he can also use part of it when he conducts his own experiments to study certain materials in the future.
So he was still quite concerned.
After a while, Senior Brother Fan Pengyue took over the printed experimental data.
There were three copies of the experimental data, one for Chen Zhengping and one for Xu Chuan. He and the other two senior brothers shared one copy.
.......
Taking a piece of information from his senior brother, Xu Chuan turned directly to the tiling formation rate of tungsten diselenide nanosheets.
【79.8212%】
A number caught his eye. His tutor Chen Zhengping's guess was correct. The tile formation rate of tungsten diselenide nanosheets prepared by the hot solvent method reached about 80%.
This number is quite impressive.
You must know that in the past, the tiling rate of the finished product he calculated was only 48.32%, which was an increase of nearly 30 percentage points, which is quite an exaggerated ratio.
It can be said that in the past, two raw materials could only produce one finished product, but now two raw materials can produce 1.6 finished products.
It's like if you and your colleague work at the same job at the same time, he can only earn 48 yuan a day, but you can earn 80 yuan, which is almost double your income.
After confirming the tiling rate data, Xu Chuan looked through the experimental data again, and then shook his head slightly.
The tile formation rate of tungsten diselenide nanosheets has been improved, but the collapse and curling effects of tungsten diselenide nanosheets still exist when they are tiled.
Van der Waals forces still have a great influence on tungsten diselenide nanosheets. After selecting the optimal synthesis conditions through mathematical models, the remaining 20% production rate, excluding other interfering factors, van der Waals forces
It will probably also affect the generation rate by about 15%.
The defective rate of 15% is also a quite exaggerated figure.
It's like spending 100 yuan. You could buy 100 steamed buns before, but now you can only buy 85.
No one is willing to accept the loss of fifteen yuan out of thin air.
The same goes for Xu Chuan, who is thinking about how to solve the impact of van der Waals forces.
If van der Waals forces can be solved, then he is confident that he can increase the yield of tungsten diselenide to more than 95%.
To increase the yield by another 15% is something that any laboratory will try its best to do.
Chen Zhengping was no exception. He was very happy at first when he saw that the tile formation rate of tungsten diselenide nanosheets reached 80%, but then he frowned when he discovered the van der Waals effect.
Shaking his head, Chen Zhengping put down the data in his hands, looked at Xu Chuan, and asked, "How are you doing? Did you find any problems?"
Xu Chuan: "The previous peak error has disappeared. No other data problems have been found so far. The generation rate of nearly 80% has increased by 30 points compared with the previous less than 50%. This is very impressive.
."
"However, I found that in the final stage of laying out tungsten diselenide, it will still collapse and curl by about 20%. When I was modeling before, I read some books about materials and speculated by the way.
It should be caused by intermolecular forces, right?”
Chen Zhengping looked at Xu Chuan in surprise, nodded, and said: "Yes, the 20% of the collapse curl is indeed caused by van der Waals force."
"This is related to the molecular properties of tungsten diselenide. It is an inorganic compound with a layered structure. Each tungsten atom is bonded with six selenium atoms in a triangular prism coordination manner. Each selenium atom is bonded with
Pyramid-like configuration and three tungsten bonds.”
"This also gives it polarity between molecules and between molecules and crystal structures. One polar molecule polarizes another molecule, generating an induced dipole moment and attracting each other, which will lead to collapse."
"The movement of electrons in molecules generates an instantaneous dipole moment, which instantly polarizes neighboring molecules, which in turn enhances the instantaneous dipole moment of the original molecule, which leads to curling."
"These two manifestations are van der Waals forces, which are two manifestations of intermolecular forces. They are very common among materials and are sometimes indispensable, but sometimes they can cause us trouble."
"Xu Chuan, you have read the material books before, do you have any ideas?"
Suddenly, Chen Zhengping changed the subject and asked Xu Chuan.
