Just because a small problem has been found does not mean that the data analysis of tungsten diselenide is complete this time.
The purpose of Xu Chuan's help this time was to analyze and find data on what hindered the complete crystallization of tungsten diselenide during the tiling process, rather than the problem of material loss from the beginning.
Of course, the latter is also very important. After all, a small peak period directly affects the yield rate by more than ten percentage points.
So in the following time, his mentor and senior brothers were very busy.
If you want to continue on the synthesis path of solvothermal method, then you must find out what is the cause of this small peak section.
As for Xu Chuan, after understanding the meaning of these experimental data, he returned to his dormitory with some experimental data and information.
He is still more accustomed to solving problems in the dormitory or the library. The former is quiet and undisturbed, making it easier to think, while the latter is for swimming in the ocean of knowledge. If he encounters any problem, he can go to the bookshelf to find information as soon as possible.
In the dormitory, Xu Chuan spread the materials he brought back on the desk and read them carefully.
Although he already knew the reason for the failure of tungsten diselenide tiling, it still took some time to describe it in mathematical language.
"Judging from the experimental data, the problem of reducing agents interfering with tungsten diselenide materials only occurs in the solvothermal method, and similar problems do not occur in other synthesis methods."
For the development and preparation of a material, slight changes in various details such as temperature, pressure, raw material concentration, time, reducing agent concentration, etc. will cause changes in the finished product.
After all, he didn't need the model to be very accurate, he just needed to roughly determine whether the hydrogen reducing agent had enough influence in the experiment.
"Perhaps I should build a mathematical model to determine the impact of hydrogen reducing agent concentration and other parameters on the collapse and curling of tungsten diselenide nanosheets?"
Mathematical modeling is indeed not his strong point. In the past, he used other mathematics professors at Princeton to model materials for him. However, he simply analyzed the experimental data of tungsten diselenide and conducted data mining and utilization.
He can still integrate mathematical tools.
Prone in front of the desk, Xu Chuan stared at the data he brought back while writing and drawing on the manuscript paper.
"No, that's not right. There is another possibility, that is, the concentration of the hydrogen reducing agent with the lowest value is completely saturated."
"This is really interesting."
How is it possible that the collapse curl problem is not affected by reducing agent concentration?
After thinking for a while, Xu Chuan picked up the pen and paper again and began to list the variables and conditions on the manuscript paper.
He even doubted whether he had made a mistake.
"However, let's put this aside for the time being. This needs to be demonstrated experimentally. The next step is the problem of collapse or curling of tungsten diselenide nanosheets due to van der Waals forces in the later stages of tiling."
But now the instructor's experimental data told him that the concentration of the reducing agent had almost no effect on the production of the finished product.
"Suppose the concentration is R, the time is T, the temperature is C, the pressure is P, the current density is A, and the reducing agent concentration is H. The collapse phenomenon of tungsten diselenide nanosheets generally increases with the increase of H within a fixed TCPR.
constant?"
"In other words, the problem occurs either with the reducing agent hydrogen, or with the hot solvent."
Suddenly, an idea came to Xu Chuan's mind.
Staring at the ceiling, Xu Chuan skillfully thought about various situations he had encountered when researching materials before, and applied them to this experimental data.
"Suppose the rate of collapse and curling of tungsten diselenide nanosheets is E, then E=∫pgh/Am·sh(2C°*pD)."
"If that's the case, the impact is indeed very small."
"Let's make one. I happened to have some communication with my senior sister two days ago, so I can try it out in practice."
In other words, the reducing agent hydrogen used by the instructor hardly plays any role in the formation process of tungsten diselenide nanosheets. Is this possible?
Studying practical problems by establishing appropriate mathematical models has become an important means for materials science research and application. However, not every laboratory has such capabilities.
Shaking his head, Xu Chuan took the data from another experimental data and recalculated it again, but the results were still not much different.
After all, most materials experiments involve quite a few variables, and the experimental processes are also dynamic. To establish an accurate dynamic model, even a university mathematics professor will spend a lot of energy.
After calculating the data in his hand, Xu Chuan looked at the data on the manuscript paper with some astonishment.
"This problem is the core, but it is not that easy to solve."
"Huh? What the hell is going on?"
Xu Chuan put down the pen in his hand, leaned back and fell on the back of his chair, staring at the gray ceiling and thinking deeply.
After calculating it twice more, the result is still the same. Although the results are slightly different each time, overall, from the data point of view, the collapse curl is indeed not affected by the H concentration.
But the data he calculated told him that this was the case.
"With the influence of the reducing agent and substrate eliminated first, from the experimental data, different concentrations of tungsten diselenide raw materials also have an impact on the tiling process."
"It's like adding salt to a portion of saturated salt water. No matter how much you add, it won't melt."
This is even more absurd than someone telling him that God is a dog.
Time passed little by little, and soon the sky outside became dark.
This situation made him frown. He had been studying materials for so many years, and this was the first time he encountered such a strange situation.
It is not uncommon to apply mathematical models to materials research and development experiments.
There is nothing more absurd than this.
For a whole afternoon, Xu Chuan was sorting out the experimental data and analyzing the useful data and included it in the execl table to facilitate subsequent processing.
This is a very tedious job that requires patience and care. Once a certain data is recorded incorrectly, the model will be immediately useless.
Just like financial accounting, you find out that there is an extra RMB 100,000 in the company account, and you don't know where it came from.
In the end, I had to painstakingly recheck the data.