I Have a Research Support System

Chen Wanqing sent Liu Gong and others to the elevator and returned to the A501 office without mentioning what happened just now.

While washing her hands, she greeted, I'm going to do an experiment, and I'll use the pyridine reagent later, so don't come into the lab.

Okay. Senior, please be safe. Xu Qiu and Han Jiaying agreed with each other.

At this time, they were sitting side by side at a desk, under the desk, the legs of the school girl were swinging restlessly.

On the computer screen, there are several synthesis-related documents, some of which involve microwave reactions, and of course most of them are ordinary synthesis reactions.

After all, not all research groups have the conditions to use microwave reactors.

In the scientific research circle, the distribution of resources is also very unbalanced, and those who are drought die, and those who are flooded die.

Mr. Wei's direct evaluation of Qingqian after returning to China, although not as rich as Yangtze River and academicians, but the starting point is not low. After all, there are 3 million start-up funds, and there are many follow-up scientific research projects , There are also millions of people who can barely make up.

Many professors are reluctant to evaluate a general project of the National Natural Science Foundation of China, with 600,000 yuan in four years, and some even less. It is basically impossible for them to buy more expensive instruments, and even a disposable glove requires a student Repeat for several days.

The research group has no money, no advanced equipment, not to mention the low work efficiency of students, and many fields cannot even enter the threshold.

For example, in the case of organic photovoltaics, there is no glove box, no simulated solar light source, no evaporation equipment, no glue spreader, and a hammer.

And these instruments and equipment add up to about 500,000 to 600,000 yuan, which can directly empty out the entire wealth of a small research group.

Although Xu Qiu went out to PY once before TRPL, and asked Mr. Wei to PY a heating glue homogenizer from Gong Yuanjiang, but in fact, the equipment of Mr. Wei's research group is very complete.

Usually, many students from other research groups come to PY Instruments.

For example, once a student who made lithium batteries came to borrow an electrochemical workstation. The batteries they produced needed to be tested repeatedly for charging and discharging, but that was a special case. Find Teacher Wei through Wu Feifei's relationship.

Another example is Cao Zhongjiang, an associate professor in the Department of Materials who is engaged in optoelectronic materials. They mainly work on perovskite, and their group is very poor. There is no simulated solar light source, and there is no glove box. After it is finished, quickly encapsulate it with epoxy resin, or encapsulate it with a glass tube for vacuuming.

After Cao Zhongjiang's students finished the device, they ran over to simulate the solar light source to test the performance of the device.

As a result, the efficiency of the MAPbI3 system is only 1%.

It should be known that this system is the standard system of perovskite, and the highest efficiency record in the world is close to 20%.

With the hardware level of a laboratory like Cao Zhongjiang, it is impossible to expect any progress and breakthroughs.

Xu Qiu was also there at the time. Listening to the exchange between Wu Feifei and Cao Zhongjiang's students, their ideas were to publish articles in Chinese core journals or SCI's third and fourth districts as soon as possible, and graduate together.

Fortunately, Cao Zhongjiang is not a doctoral supervisor, and there are no doctoral students in the group. Otherwise, once a student enters the group, it will be a problem how to graduate, and the road will be blocked.

Brother, this is the document, Han Jiaying pointed to the PDF file on the screen and said:

When I was planning the reaction conditions, I referred to their reaction conditions, but they used a microwave reaction, the reaction time was 4 hours, the temperature was 120 degrees Celsius, and the yield was 80%. Our reaction is similar. I also set the temperature Controlled at 120 degrees Celsius, the reaction time was extended to 24 hours, but the yield was only 40%.”

Xu Qiu took a closer look. He had read this article before and still had some impressions. It reported a bridged PDI dimer.

The reaction in the literature is very similar to the two reactions he submitted today, that is, the reaction of introducing boronic acid ester on the aromatic ring with iridium catalysis and the reaction of biboronic acid pinacol ester is very similar, but the raw materials used are different. He used branch Shaped B3T and B4T are linear molecules in the literature.

After thinking for a while, Xu Qiu analyzed:

On the one hand, the raw material in the literature is a linear molecule with only two reaction sites on both sides, while our reaction has three/four reaction sites, their reaction will naturally be easier than ours, and the yield can also be high. understand.

On the other hand, look at their entire reaction path, there are seven steps of reaction, only this step and the next Suzuki reaction use microwave reactors, other times are common reaction conditions, so... Speaking of here , Xu Qiu deliberately paused, letting the school girl think for herself.

Hmm... Han Jiaying tilted her head and thought for a while, then said, Maybe these two reactions involving borate raw materials are more suitable for microwave reactors.

Well, it's basically the reason, Xu Qiu smiled, and further explained:

This also shows that microwave synthesis is not necessary for all synthetic reactions, because we see that the author of this article is from a large research group with strong experimental skills in organic synthesis, and they will certainly not lack microwave reactors. This kind of equipment, since microwave synthesis is not used in the other five-step reactions, it is probably not necessary to use it.

Of course, the conclusions obtained in the literature are the experience of others after all, and we have to try it ourselves to know how to do it, and then we can convert it into our own experience.

Han Jiaying nodded thoughtfully, and then said: You can try the reaction of introducing boric acid ester first, and see the effect of using a microwave reactor.

Let's wait until tomorrow. Today we have to go back to Handan campus early. Xu Qiu thought for a while and suggested: The 4-hour microwave reaction in the literature has an 80% yield. Our reaction is more difficult. We can try to make the reaction Time increased to 6 hours.

Okay, then I'll try this condition tomorrow. Han Jiaying agreed.

By the way, Xu Qiu said suddenly: Liu Gong also said just now that microwaves are harmful to the human body. Although the instrument can confine most of the microwaves it generates inside the cavity, some microwave radiation will inevitably escape. Come out, so it's best to stay away from the instrument when it's on.

Yeah, Han Jiaying nodded, I've learned about this before. You can buy a bellyband that prevents microwave radiation.

Anti-radiation bellyband... Xu Qiu turned his head, and looked at the junior girl's flat belly with a strange expression, and he didn't know where the groin started.

Han Jiaying didn't seem to notice Xu Qiu's abnormality, she continued to ask like a curious baby: Brother, what is the principle of the microwave reaction?

Speaking of which, when the two of them get along, academic exchanges take up the vast majority of their time...

Xu Qiu copied Liu Gong's skills, and now he has a good understanding of microwaves and microwave reactors, and explained carefully:

Microwave is a kind of electromagnetic wave with a wavelength of less than 1 meter. In fact, microwaves are not uncommon in life. Any object will radiate microwaves, and the lower the temperature, the stronger the microwave radiation...

...Microwave has a much lower energy level than laser, but it can produce several times or even dozens of times higher efficiency than conventional methods at the same temperature or even lower temperature. Views are different, so far there is no rigorous theory that can well explain the mechanism of the microwave reaction...

...although the mechanism is not yet clear, but this does not affect people's use of it.

Xu Qiu spoke eloquently for a few minutes, Han Jiaying's mind was filled with new knowledge, she was a little dazed, nodded slightly, and slowly digested it.

After a while, Chen Wanqing returned from the laboratory, opened the door and entered A502.

Xu Qiu subconsciously sniffed in the direction of the senior sister. This time, he didn't smell pyridine, but he didn't think too much about it.

What he didn't know was that after finishing the experiment, the senior sister walked to the ventilation window at the end of the corridor and stayed there for ten minutes before returning to the office.

The three of them rested for a while, went to the school bus point together, and took the 4:30 school bus back to Handan Campus.

On the school bus, Han Jiaying leaned on Xu Qiu's shoulder and fell asleep.

Xu Qiu closed his eyes and rested his mind, thinking about the next experiment process.

He didn't make devices today. On the one hand, he had to check and accept the microwave reactor in the afternoon. On the other hand, he had already made three batches in a row, and he didn't plan to repeat it.

In the current 3D-PDI system, the performance of the device is stuck at 7.83%. It is said that it is close to the goal, but it is actually stuck in a bottleneck.

Xu Qiu felt that if he kept trying to make devices repeatedly, at most he could repeat 7.83% of the simulation laboratory, and it would be difficult to break through to more than 8%.

Moreover, according to his thinking, since he wants to break the record, he must make a real breakthrough. It is best to get around 8.3%, or even higher, to widen the gap from the original record.

Otherwise, it just broke through from 7.92% to 8.00%, which is not enough to be true.

This is not an upgrade to fight monsters. From the seventh-order Dzogchen to the eighth-order early stage, there is a leapfrog improvement. The numbers are continuous, and 0.1% is just 0.1%.

Of course, it would be even better if he could reach above 9%, but he still has a B number, and for his current system, there is a high probability that he will not be able to get up.

As for how to achieve further improvement, Xu Qiu generally has a plan, and he intends to find breakthroughs from other means of representation.

Just like when optimizing PCE11, he was first inspired by the UV-vis spectrum changes provided by his senior, and then combined a series of experimental methods such as DSC, TEM, GIWAXS, etc., to obtain the important fact that PCE11 has high crystallinity. Conclusion, and then guide him to make the corresponding device optimization.

Now he studies the 3D-PDI system, except for the common bright-state J-V curve used to obtain the photoelectric performance of the device, there are not many other characterization methods involved.

At present, the known clues are that simple PDI materials have high crystallinity, but in the synthesized 3D-PDI molecules, whether the crystallinity is still maintained, and what is the blended morphology of the effective layer materials are not clear.

To obtain morphological information, the common means are AFM, TEM and GIWAXS, among which the latter two are more intuitive.

However, the timing of the light source GIWAXS machine is out of his control. The most recent one was scheduled for April, and there are still a few weeks to test. The TEM is an instrument of the Department of Chemistry, and it is also available in the simulation laboratory. Let’s test it It is more convenient.

According to his original plan, if he can't make an appointment for TEM this week, he will experiment on his own in the simulation laboratory first. Now that the appointment is successful, there is no need to spend extra points.

After thinking for a while, Xu Qiu felt sleepy and fell asleep.

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