I Have a Research Support System

After lunch, take a short rest and continue the experiment.

Set up the Soxhlet extraction device, and use methanol, acetone, and n-hexane solvents to clean the third batch of synthesized products.

During the waiting period, he brushed the dirty bottle produced this time with a brush, and then put it into the alkali tank.

The toluene was then redistilled.

Vote for the fourth batch of responses.

Because the 2FBT monomers with 22 and 26 carbon atom side chains have just been ordered online, and it will take a few days to arrive.

So Xu Qiu can only use the existing 18 carbon atoms, 2HD side chain monomer to test the water this time.

The target synthetic product is P2FBT4T-2HD.

Through continuous adjustment and optimization, the molecular name has changed from the original PBT4T to a long string, P2FBT4T-2HD.

No wonder some people choose to name them X1 and X2, which really saves a lot of trouble.

Chen Wanqing also added a reaction, which was the ratio of 3:7 that failed last time.

...

After the two completed all the experiments, it was already seven o'clock in the evening.

After dinner, Chen Wanqing took the school bus back to the Handan campus.

Xu Qiu estimated that the fourth batch of polymerization would be shut down around 7:00 tomorrow morning, and the third batch of Soxhlet extraction would be completed at the same time, and there would be a lot of things waiting for him after that, such as chloroform extraction.

Would you like to stay another night in Zhangjiang?

It's just that tomorrow is Wednesday, and there will be a degree course of Nanomaterials in the morning.

However, this class is said to be not difficult, and skipping a class should not have a big impact.

Moreover, in the first two weeks of Modu Comprehensive University, you can freely withdraw and choose courses, so the list of students is uncertain, and teachers usually don't call names.

In fact, the proportion of teachers who can roll their names is not much, probably less than 20%.

Most of them are concentrated in liberal arts courses, and teachers in science and engineering courses are rarely named.

For teachers of science and engineering, the teaching task is only to complete the rigid requirements stipulated by the school.

The focus of most teachers' work is on scientific research, because the teaching situation has little to do with their evaluation of titles, promotions, and funding projects. These aspects are more about the output of scientific research.

Of course, personal connections are also one of the very important considerations.

However, unless the relationship is in the sky, the network can only add to the cake.

Without strong scientific research capabilities, many people may stay as associate professors for the rest of their lives.

For various reasons, many teachers read PPT in class, and the PPT may be done for him by his students.

The format of the final exam will also choose the form of a speech rather than a written exam.

This can save energy and devote more time to scientific research or interpersonal relationships.

Therefore, for students, there are not many things that can be learned in most courses, and in most cases, they need to study independently after class.

...

After comprehensive consideration, Xu Qiu decided to stay in the Zhangjiang campus again overnight.

In the evening, his mobile phone received a new WeChat message, which was the dormitory group of him and two roommates.

Tao Yan sent four messages in succession:

@许秋, where are you?

I haven't been back to the dormitory for two days

I didn't have your frequency before.

You have to be safe outside

Xu Qiu: I'm in Zhangjiang, I just finished the experiment

Tao Yan: Okay, I thought you went to KF outside.

Xu Qiu: ...

This guy is really outspoken.

...

the next morning.

After Xu Qiu got up, he went directly to the laboratory.

He first checked the situation of the fourth batch of reactions.

There are two reactions in total, and the senior sister's is relatively normal, which is similar to the other two systems she did before.

However, in Xu Qiu's reaction bottle, not many solid products precipitated, most likely because the increase in the length of the branch chain effectively increased the solubility of the product.

However, it is not easy to draw conclusions.

Because the possibility that the experiment was not done well cannot be ruled out, such as the wrong material ratio, resulting in a low molecular weight product, a similar situation will occur.

Whether the performance of the material is good or bad, it is still necessary to make a photovoltaic device before the final decision can be made.

Xu Qiu shut down the two reactions and began to block the reaction.

At this time, the Soxhlet extraction of the third batch of reactions is basically completed.

After estimating the time, Xu Qiu found that when the molecular weight of the product is relatively high, it is not necessary to perform Soxhlet extraction with a mixed solvent for 24 hours to purify them.

However, unlike the polymerization reaction, the Soxhlet extraction time is extended from 12 hours to 24 hours, which has little effect on the product performance, but only wastes time.

After taking out the third batch of products and roughly drying them, Xu Qiu took out the chloroform solvent recovered last time and prepared to use chloroform for extraction.

There are exactly four groups of products, and each group can distribute about 200 ml of chloroform.

The loss of using chloroform as a Soxhlet extraction solvent is relatively small.

If the loss is large, it means that a large amount of solvent has volatilized into the air, which may cause the experimenter to be poisoned.

After all, matter cannot disappear for no reason.

After the last experiment, Xu Qiu did not show signs of chloroform poisoning as shown in the MSDS, nor did he feel unwell.

It seems that as long as the protection is in place, the risk of Soxhlet extraction with chloroform is actually not high.

...

Like yesterday, Chen Wanqing arrived at the laboratory around ten o'clock.

Is the experiment going well?

The fourth batch of reactions, both of us look good, the third batch of reaction products need to be extracted with chloroform Soxhlet, I have set up the equipment for you. Xu Qiu said.

Okay, I'll be the one to operate this time. Chen Wanqing said.

Xu Qiu was a little worried about her experimental ability, so she didn't leave, and stood by to watch.

Completed without incident.

He found that when the senior sister was doing experiments, although there were always various small problems, there were never any major safety-related problems.

Afterwards, the pair re-dropped the third crop extracted with chloroform into methanol.

The product is precipitated, dried and weighed.

The yield of Xu Qiu's two products, PBT4T, is about 80 mg, which is higher than that of the second batch.

And P2FBT4T-2BO is only 30 mg, and the yield is terrible, less than 20%.

Because a large amount of insoluble product remained in the filter paper and could not be extracted by chloroform.

Chen Wanqing's two batches of products are not bad, with a yield of about 60%.

Finally, the two carried out rough treatment of the fourth batch of products, built a Soxhlet extraction device, and cleaned it with three mixed solvents.

Another busy day.

After completing all the experiments, it was already past eight o'clock in the evening, and I could only catch the last school bus.

Fortunately, there is no new response today, so there is no need to close the response on time the next morning.

He can finally return to the Handan campus.

...

Back in the dormitory, Xu Qiu found that the other two roommates were there.

Ren Bin was still the same as usual, sitting by the computer and playing games, while Tao Yan was playing with Switch on the bed.

After the two of them worked hard at the end of last semester, they slacked off again this semester.

Thinking about it, the lives of the two of them in the next few years are basically determined. One is to return to school for graduate school after two years of bacteriology, and the other is to maintain a graduate school for three years. Naturally, there is not much tension.

Seeing the two of them, Xu Qiu thought about himself again.

Doing so hard in scientific research is harder than 996, and I don't have a high salary. I can only receive a monthly subsidy of 1,000 yuan from Teacher Wei.

And for what?

Thanks to ghift for the 200 point reward. Next week, the category will be strongly promoted, please recommend a ticket. The National Day is coming soon, and there are not many manuscripts, so there will be no updates, and there will be two updates every day.