Chapter 70 Well, I also think this is feasible
However, Sui Feng felt that Xu Zhou came to him because he wanted him to help lead Ning Chen’s experiments in the future.
After all, Ning Chen is also a rookie in the laboratory. As a senior, he must set an example.
Sui Feng had a very good impression of Ning Chen after Ning Chen had done so much work for him.
Although Sui Feng is currently in a hurry with his experiments, Sui Feng is still willing to spare his precious time to give Ning Chen some guidance.
"Sui Feng, Ning Chen's experimental project is about to begin. I also want you to help participate in this experiment. You must also have a certain understanding of the content of the experiment."
"No problem. , I am definitely willing to help participate in Junior Brother Ning Chen’s experiment.”
Seeing that Sui Feng had no objection, Xu Zhou explained the core content of Ning Chen’s experiment.
Listening to Xu Zhou’s explanation, Sui Feng also felt that Ning Chen’s choice of topic was indeed a good one.
If done well in the future, it will even have higher academic value than the subject Sui Feng is working on now.
After explaining the core content of the experiment, Xu Zhou continued:
"If there are no problems, you can start the experiment. The first problem now is to find the most suitable boron addition ratio and the choice of etchant. If you have any new progress or encounter any difficulties, you can come to me at any time."
After Xu Zhou left, Sui Feng and Ning Chen discussed these issues.
"Ning Chen, do you have any ideas about the proportion of boron?"
Ning Chen thought for a while and said:
"Because boron is an additive, the amount added must be much smaller. My idea is to first conduct experiments in the range of element mass ratios from 100:1 to 5:1 to find a more suitable addition ratio. As for boron As for the addition method, I think boric acid is better."
Sui Feng thought about it and felt that what Ning Chen said was very reasonable.
“Well, I also think this is feasible.”
“As for the choice of etchants, our commonly used etchants include sulfuric acid, hydrogen peroxide, hydrochloric acid, chromic acid, ferric chloride, hydrogen Hydrofluoric acid, etc. It is best for us to test these etchants separately to see the effect."
"Yes, I think this is feasible." Sui Feng nodded.
"In addition, in order to fill the space in the silicon nanoparticles so that the silicon nanoparticles can eventually form a porous structure, we may need to add some other substances to the etchant. This may require the experiment to be carried out for a period of time, and then We analyzed and discussed it."
"Well...I also think this is feasible..."
After discussing with Ning Chen for a while, Sui Feng realized that he had nothing to give Ning Chen. Suggestion, Ning Chen seems to have planned everything.
“I’m sorry that Teacher Xu asked me to participate in Ning Chen’s experiment. He didn’t ask me to guide Ning Chen, but... asked me to help Ning Chen?”
Because in addition to helping Ning Chen Apart from some experiments on Ning Chen, Sui Feng seemed unable to do anything else to help Ning Chen.
This reality is a bit cruel for Sui Feng. After all, he is also a sophomore in graduate school, and Ning Chen is not yet a sophomore.
However, Sui Feng quickly accepted this reality. After all, Ning Chen was an awesome person who won the national championship in the autumn competition.
"Then you make a detailed experiment plan, and I will help you share part of the experiment?"
Ning Chen saw that Sui Feng offered to help him with the experiment, and knew that Sui Feng might want to understand. Something happened.
"No need for now. I can do these experiments myself. I will ask you for help when I need it."
"That's fine, just call me if you need anything."
Ning Chen was not really embarrassed to let Sui Feng help him with the experiment, but Ning Chen trusted his own hands more.
If it is really because of some problems with other people's experimental operations that it affects the final experimental conclusion, then it is a small gain but a big loss.
...In the following time, Ning Chen officially started his own experimental research.
The experimental process was relatively monotonous. Ning Chen needed to repeat similar experimental steps in large numbers. Some experiments even had to be repeated dozens or hundreds of times.
Fortunately, these experiments do not consume much physical energy, and are much easier than the previous grinding and polishing.
When the experiment progressed to a stage, Ning Chen made a detailed summary and analysis of the experimental data and came to some valuable conclusions.
"As long as the particle size of silicon nanoparticles is controlled below 200nm, it will not have any impact on the experiment..."
"The ratio of silicon to boron is basically determined, about every 1 Grams of silicon nanoparticles, with 0.06 grams of boron added, is equivalent to about 0.4 grams of boric acid solute..."
"The selection of etchant still requires further experiments. At present, the effect of hydrofluoric acid solution is quite good..."
After completing the first stage of the experiment, Ning Chen communicated with Xuzhou The progress of their own experiments.
After understanding the progress and phenomena of Ning Chen’s experiment, Xu Zhou was also quite satisfied with the progress of Ning Chen’s experiment.
“Yes, several of the main problems have been solved, which proves that our idea is indeed feasible, and the direction of the next experiment is also much clearer.”
Although Ning Ning Chen Chen has not yet prepared the ideal porous silicon nanoparticle structure, but through various current phenomena, it has given relatively positive feedback.
Ning Chen was not satisfied with this. While continuing to conduct experiments, he also spent a lot of time reading relevant papers.
Ning Chen knew that his current knowledge reserve was far from enough, so he found hundreds of related papers and studied them seriously.
Most of these papers are in pure English. Ning Chen supplemented the relevant professional vocabulary so that he could understand the contents of these papers smoothly.
The results of the thesis research are very significant. Ning Chen’s experience in materials subject is increasing rapidly, and his experience in physics and chemistry has also been improved to varying degrees.
This made Ning Chen think of some experimental improvement methods that he could try, which may help Ning Chen synthesize the ideal porous silicon nanoparticle structure.
"The dried powder can be annealed in a high-temperature argon environment..."
"Add deionized water to hydrofluoric acid, and the washing effect should be better..."< br>
"If silver nitrate is added to the etchant, will it be more conducive to the formation of porous structures..."
Ning Chen tried these hypotheses one by one, most of them. All ended in failure.
But this did not shake Ning Chen's determination to continue the experiment. What made Ning Chen excited was that some of his hypotheses were indeed fulfilled.
Compared with the first stage of the experiment, the final product prepared by myself is closer to the ideal state.
After learning about the latest progress of the experiment, Xu Zhou also praised Ning Chen's results.
Just what Ning Chen has done now is enough to write a good paper.
Of course Xuzhou also knew that Ning Chen’s goal did not stop there, and encouraged Ning Chen to continue the experiment.
……
At the beginning of a new experimental phase, Ning Chen had completely figured out the proportions of various experimental raw materials to be added, and the choice of etchants was also completely determined.
Finally, after hundreds of experiments, Ning Chen successfully prepared the ideal porous silicon nanoparticles for the first time.
Looking at the sample pictures in the SEM (scanning electron microscope), Ning Chen couldn't describe his feelings for a moment.
(End of this chapter)