Chapter 75 You are really a materials genius
“This is... a new form of porous silicon nanoparticles!”
Ning Chen keenly discovered that what is shown in this TEM image The pore structure is different from the pore structure of previous products.
And this is another form of porous silicon nanoparticles that Ning Chen hypothesized a few days ago!
In excitement, Ning Chen looked up the experimental data of these products.
"It turns out that when the amount of boric acid added is greatly increased, this new pore structure will be generated. It seems that the idea of using boron as a pure additive from the beginning is an undesirable way of thinking."< br>
In this experiment, the amount of boric acid added was even more than that of nano-silicon. Ning Chen would never have dared to think of such an addition ratio before.
After completing the TEM measurements of all the samples in his hand, Ning Chen carefully analyzed the rules.
After analysis, Ning Chen found that near a certain larger boric acid addition ratio, the products generated had similar new pore structures.
This further confirms Ning Chen’s hypothesis that the occurrence of this phenomenon is probably not accidental.
Returning to the laboratory with excitement, Ning Chen couldn't afford to rest and immediately prepared for a new round of experiments.
This time, Ning Chen readjusted the addition ratio of boric acid and nano-silicon, controlling the quality of the two between 7:5 and 9:5, and divided the mass ratio more accurately.
In a new round of measurements, Ning Chen discovered that the generation of this new type of porous silicon nanoparticle product was not an accidental phenomenon.
“When the mass ratio of boric acid and nano-silicon is around 8:5, the generated product has a larger pore structure. And for products with this structure, the yield rate of standard samples is significantly improved. Quite a bit.”
After just one stage of improvement, the standard sample generation rate increased from 30% to 50%. This improvement made Ning Chen very satisfied. .
...
On this day, Xu Zhou came to Ning Chen’s laboratory to learn about the latest progress of Ning Chen’s experiments.
“How are you, Ning Chen, is there any progress in recent experiments?”
Ning Chen found out some recent TME images and various other experimental data, and asked Xuzhou Started telling.
"Mr. Xu, the recent experiment has indeed made a big breakthrough. After I changed the addition ratio of boric acid and nano-silicon, a new porous silicon nanoparticle structure was generated..."
Listening to Ning Chen's explanation, Xu Zhou was also very surprised.
“The amount of boric acid added is controlled to such a high level...and the formation of this new type of product is really incredible!”
For a while, Xuzhou didn’t Think clearly about the theoretical basis of the entire experiment, but these experimental phenomena undoubtedly show that Ning Chen's idea is completely correct.
"Ning Chen, can you tell me how you came up with the idea of synthesizing this new type of product in this way?"
This time, Ning Chen did not say anything. He used random excuses to obscure the past, but explained the reasons theoretically.
"Mr. Xu, we have discussed before that one of the important core steps in this experiment is to convert intrinsic silicon nanoparticles into p-type nanoparticles."
"Yes, this problem was at that time We have also said. Therefore, this special hole-like structure can only be generated when the proportion of boron is added."
"Teacher Xu, I later re-established a new one-dimensional diffusion model. , this is the formula of this model——"
Ning Chen wrote a partial differential equation on paper and explained the principles to Xu Zhou.
“Through this one-dimensional diffusion model, we can find the relationship between the total concentration of boron, the surface concentration of boron atoms, and the diffusion coefficient. After calculation, I found that when the total concentration of boron At a higher level, the entire model is still possible..."
Because this involved some high-level mathematical knowledge, Xu Zhou did not understand the specific principles.
But Xu Zhou also knew some mathematics after all. After careful discussion with Ning Chen, he finally understood Ning Chen’s thoughts.
“So, if you construct a one-dimensional diffusion model in this way, you can indeed construct a new porous silicon nanoparticle structure. Unexpectedly, the most important part of it is actually a mathematical formula.”< br>
At this time, Xu Zhou suddenly understood why Ning Chen continued to study materials science despite his outstanding mathematical ability.
A good foundation in mathematics gave Ning Chen a higher ceiling in various other science and engineering subjects.
In many cases, what hinders the upward development of materials science may not be the knowledge of pure materials science, but the basic knowledge of other sciences.
"Well, Teacher Xu, you can indeed say that. Otherwise, I might not consider adding so much boric acid at all."
After understanding the core theory, the remaining Xuzhou immediately understood the principle.
“According to this theory, in p-type nanosilicon, adding a higher concentration of boric acid can obtain a lower Fermi level and reduce the energy barrier for electrons to transfer from silicon to silver, thereby having It is beneficial to produce a larger pore structure during the etching process..." As he spoke, Xu Zhou felt more and more that Ning Chen was really a genius in materials science.
Ning Chen did not give up on materials science, which was indeed a very wise choice.
"Mr. Xu, next I want to continue to accurately add the proportion of boric acid and strive to maximize the production rate of standard products. In addition, I also plan to start research on the application of this material in lithium battery anodes. Researched. "
"Well, now our experimental direction is very clear. Judging from the current measured data on this material, it does have the potential to be used as anode material for lithium batteries. "
Xu Zhou felt more and more that Ning Chen’s current research had high academic value.
If the follow-up research goes well, maybe Ning Chen will actually publish an article in "Nature".
...
Every day that followed, Ning Chen continued to spend time in the laboratory.
Ning Chen didn’t think there was anything monotonous about this kind of life. Instead, he enjoyed himself and enjoyed the fun of experimentation and research.
Although failure will account for the vast majority of the research process, these failures are helping Ning Chen finally reach the other side of success.
After continuous experiments and improvements, Ning Chen has successfully increased the output rate of standard products to 90%. There has also been some progress in research on this material as an anode material for lithium batteries.
At noon that day, Ning Chen received a call from his mother, Wang Yanping.
"Chenchen, how are you doing lately?"
"It's pretty good. I've been in the lab lately. How are you and dad?"
"We are too. It’s good, don’t worry. We want to visit your school this weekend, don’t you want to delay your experiment?”
Hearing Wang Yanping’s words, Ning Chen also realized that he had not been home for a long time. .
Ning Chen's home is not far from Shengzhou. In his previous life, Ning Chen might have gone home once a month, and no matter how low the frequency was, it would never have been more than three months.
But now, because he was busy doing experiments at school, Ning Chen did not go home throughout the summer vacation.
Ning Chen knew that his parents did not want to come to see the school, but wanted to come and see him.
“No need to delay, my time is more flexible now, you and Dad can come over without worry.”
“Okay, then I will go to the train station to check the tickets in the evening, and if there is one suitable, I will go directly I bought it. If you don’t have a suitable ticket, you can go there by bus.”
Ning Chen was about to buy a ticket directly for Wang Yanping, but suddenly realized that it was 2010.
At this time, 12306 has just been opened and is in the trial operation stage. Ticket information can only be checked online, but tickets cannot be purchased directly on the Internet.
"Okay, tell me after you buy the tickets, and I will pick you up at the station."
After hanging up the phone, Ning Chen was also looking forward to the arrival of his parents.
"When my parents come over, I can let them live in the newly bought house." Ning Chen thought.
On Saturday, Ning Chen arrived at the train station in advance and waited for the arrival of Ning Qiang and Wang Yanping at the exit.
Liu Li arrived at Shengzhou Station on time. A few minutes later, Ning Chen saw Ning Qiang and Wang Yanping walking down the platform stairs.
Both of them were carrying things, and it seemed they were all for Ning Chen.
Ning Chen waved to them, and the two of them also saw Ning Chen outside the station exit.
"Dad, Mom, why do you bring so many things?"
"Chenchen, these are the dumplings stuffed with pickled cabbage that your mother made for you. They were just steamed this morning. These are the Nanguo pears that just came down. They are big, sweet and especially delicious."
Wang Yanping saw this. He also said:
"You usually don't get anything good to eat at school, so this brings you something to improve the food."
(End of Chapter)