I Have a Research Support System

Monday morning, group meeting.

Wu Feifei's perovskite system has made progress. She uses ammonium chloride as an additive and does not require thermal annealing operations. The efficiency has exceeded the standard sample.

Next, she plans to demonstrate the possible reasons for this phenomenon through experiments, and plans to do some research on the charge transport mechanism with Tian Qing.

The most critical data, that is, the optoelectronic performance has been almost optimized, and only other characterization experiments need to be supplemented.

Moreover, her work is quite innovative, and there is a high probability that she can post a communication. It is estimated that she will be able to submit another article in less than a month.

Wei Xingsi looked very happy on his face, but he still urged Wu Feifei to speed up the progress of the experiment, so as not to be picked by others.

Duan Yun's experiment this week has not made any progress, and the device is still under construction.

According to his description, Xu Qiu estimated that he would not be able to set up this device for a while.

After hearing this, Mr. Wei changed his face and put on a straight face, saying that he spends money and does nothing.

Xu Qiu watched from below, amazed at the speed of this face-changing.

Chen Wanqing's report was quite satisfactory. Teacher Wei didn't comment too much, but just let her continue to do it according to her ideas.

Finally it was Xu Qiu's turn.

After finishing the report, Teacher Wei commented:

That's right, this time it's done according to the format, it doesn't look as strenuous as last time.

In general, I agree with your experimental ideas, but at this stage, it is better not to broaden the research direction too broadly.

Chen Wanqing also has her project, and now you are alone.

This semester, I'll see if I can recruit a few more undergraduates to help you with experiments. Wu Feifei is also short of manpower.

How about this, don't do your PBT2T, 3T, 5T system first, because there are too many variables in the regulation, just focus on the current PBT4T system.

Now the efficiency is close to 5%, as a new system, it is already very good.

As for the experimental conditions, you can try shortening the reaction time and extracting with chloroform Soxhlet. I guess there is still a certain effect.

Also, the two of you must pay attention to safety when doing experiments in Zhangjiang, and contact me in time if there is anything wrong.

Okay. Xu Qiu and Chen Wanqing said at the same time.

...

In the afternoon, the two went to the Zhangjiang campus with the two batches of materials synthesized earlier.

They first went to the drug warehouse to pick up the previously ordered color-changing silica gel, and received some necessary glass instruments.

Then I came to the laboratory and found that the four oil baths I bought last time had arrived.

It was delivered by the drug warehouse on Monday morning, and it was left at the door because no one received it.

There is no one in the whole building here, and there are access control and monitoring, so there is no need to worry about losing it.

Entering the A502 laboratory, Xu Qiu put on his lab coat, four layers of gloves, and a gas mask.

The gas mask, because it is shaped like a pig's nose, is commonly known as a pig's nose.

Its front end is a multi-layer filter device. The one in his hand is equipped with an organic solvent filter, which has better protection effect.

The other parts are mainly made of rubber, which can completely cover the mouth and nose after wearing it.

The mask has four elastic straps that connect to a plastic holder.

Align the mask with the face, place the plastic holder above the nape of your neck, and you're done.

After Xu Qiu put on the gas mask, he felt that the elastic band was very tight, and he felt a little uncomfortable at first.

It took a few seconds to get used to it.

After completing the complete set of protection, he found that Chen Wanqing was also playing with the gas mask.

Sister, are you coming too? Xu Qiu asked.

After speaking, he found that speaking through the gas mask, his voice would become quieter, and it would become muffled.

What are you talking about? Chen Wanqing couldn't hear his voice clearly from a distance away.

Xu Qiu could clearly hear the senior sister's voice, because the gas mask did not cover her ears.

He leaned in front of the senior sister and said again:

I just said, are you coming too?

Yeah, Chen Wanqing nodded and said, I'm still a little worried about you doing the experiment by yourself.

Okay, then you just stand a little farther away and watch, and I will operate it. Xu Qiu said.

By the way, you know how to perform experiments. Chen Wanqing said.

Needless to say Soxhlet extraction, I used rotary steaming in the Organic Chemistry Experiment class. Xu Qiu said.

That's good. Chen Wanqing said.

...

The two took precautions and entered the laboratory.

Xu Qiu took out the sample, wrapped it with filter paper, put it into the extraction tube, and started to build the Soxhlet extraction device, a total of four sets were to be built.

First build a prototype.

From bottom to top, they are Erlenmeyer flask, extraction tube, spherical condenser, three-way valve and balloon.

Then make four nitrogen balloons and insert them above the spherical condenser.

Add about 250 ml of chloroform solvent into each Erlenmeyer flask, and then add a long stirring bar.

Pump and exhaust three times to ensure a nitrogen atmosphere in the closed system.

Turn on the condensed water, raise the temperature of the oil bath to 60°C, reflux the chloroform, and start the extraction.

...

It took almost an hour to set up all four sets of devices.

During this period, Chen Wanqing was not idle either.

First, all the windows in the laboratory were opened to keep the room ventilated.

Then, put the color-changing silica gel into the vacuum tank where the monomer was previously stored, and then fill it with nitrogen protection.

Then, take out the glass instrument soaked in the alkali tank before, clean it with an ultrasonic cleaner, and put it in an oven.

In addition, she also transferred the garbage in several small trash cans in the laboratory to a large trash can.

The so-called large garbage bin is a cardboard box with a large black garbage bag inside, and then transfer the small garbage bag inside.

Lab rubbish cannot be discarded at will, and must be thrown to the designated experimental rubbish recycling point.

In the early years, the school management was not so strict, and there was no person in charge of experimental waste in the Department of Materials, and the experimental waste was directly mixed with domestic waste.

Now, the regulation is getting stricter.

Not only that, the department also requires each laboratory to conduct regular safety inspections and self-examinations, and a lot of forms need to be filled out.

Of course, this kind of self-examination is generally useless.

Therefore, departments and schools will organize safety inspections from time to time.

Although it is said to be a surprise inspection, there will basically be rumors a week before the inspection.

The instructors of each research group will ask their students to tidy up the laboratory in advance to deal with the unannounced inspection.

From the perspective of laboratory safety, it is more or less effective.

Because it takes time to extract the product with chloroform, Chen Wanqing said:

Let's dispose of the waste liquid and experimental waste accumulated before, mainly the waste liquid, and entrust the School of Pharmacy to handle it.

They don't take it every day, I checked, and they just did it this afternoon.

OK.

The two tied up the mouth of the black garbage bag containing the experimental garbage, neatly stacked it on the cart, and pushed it to the designated recycling point.