I Have a Research Support System

"Han Jiaying, why are you here?" Xu Qiu asked suspiciously:

"Also, how did you get in?"

The microelectronics building has access control, and the junior girl has just joined Mr. Wei's research group, so there is a high probability that she has never gone through access control.

"On the school bus I took, two people happened to come to the microelectronics building, and I walked in behind them."

"You can tell me in advance, and I will open the door for you."

"I sent you a WeChat message, but you didn't reply to me." Han Jiaying pouted.

Xu Qiu touched his pocket, it was empty, the phone should be in A501.

This is a bit embarrassing, he quickly changed the subject:

"Those two people are probably also from the Department of Materials. How many floors did they go to?"

"Let's go to the third floor."

"They should be students of Teacher Zhang Jianwen. Zhang Jianwen and Teacher Wei returned to China at about the same time, so the laboratory was also arranged in Zhang Jiang."

After finishing speaking, Xu Qiu continued to ask:

"By the way, what are you running here for?"

"I just want to learn the experimental operation from my senior brother, senior sister Chen Wanqing..." Han Jiaying lowered her voice as she spoke.

Could it be that the school girl felt that Chen Wanqing's teaching was unreliable, so she ran over to hug her thigh?

Xu Qiu was a little dumbfounded:

"Zhang Jiang mainly does organic synthesis. It's very hard and dangerous. Are you sure you want to learn?"

Han Jiaying nodded seriously.

"Then follow me. At this stage, you should listen more, watch more and move less. Don't touch any items in the laboratory without my permission."

"OK."

"However, the only time I have been doing synthesis recently is today. After this batch of products is synthesized, I don't know when the next batch will be."

Xu Qiu showed her the four layers of gloves in his hand:

"You wear a lab coat and gloves first. If you don't do experiments, you can wear one layer of PE gloves and one layer of latex gloves. If you are doing experiments, you'd better wear four layers like me."

...

While experimenting, Xu Qiu introduced to Han Jiaying the precautions for organic synthesis, as well as various common sense in the synthesis laboratory.

The school girl is quite obedient, she follows him wherever he goes, and doesn't mess with the equipment in the laboratory.

And she also took out an experiment notebook to record Xu Qiu's teaching content.

However, once the experimental notebook enters the synthesis laboratory, there is no way to take it out again.

Finally, she thought of a way to take pictures of the contents recorded in the experiment notebook and save them with her mobile phone, which is quite clever.

According to the laboratory tradition, Xu Qiu invited the junior girls to have dinner.

The location, of course, is the cafeteria.

After the meal, the juniors were sent to the school bus, and Xu Qiu returned to the laboratory to continue the experiment.

He was the only one left in the huge laboratory, so it was really a bit empty.

...

Xu Qiu stayed in Zhangjiang for another night.

Here comes the problem. The next day is Wednesday, and there are classes in the morning.

I have no choice but to skip class.

When experiments and classes are not available at the same time, the latter can only be given up.

Xu Qiu apologized to Shen Cheng, the teacher of "Nanomaterials", in his heart.

Before, he asked Tian Qing that Shen Cheng never called names in class, and the exam was relatively simple.

Although it is a closed book, as long as you memorize the more than 200 pages of PPT given by him, it is not difficult to get a good grade.

Tian Qing said that she easily got an A in this course.

Xu Qiu's grade point is 3.5, and his test skills, especially the ability to memorize PPT, are naturally full, so it's not very empty.

...

Process the polymerization products in the morning and return to Handan Campus in the afternoon.

The senior sister made an appointment for today's gel chromatograph to test Gel Permeation Chromatography (GPC).

The six most recently synthesized batches of polymer were tested.

Xu Qiu came to Caiyi 216, weighed about 1 mg of each polymer material, put it into a 2 ml disposable centrifuge tube, and numbered it with a marker pen.

Then, together with Chen Wanqing, they put on disposable syringes, oil-phase filter heads, and gloves, and headed to the testing site - Advanced Materials Building.

The principle of gel permeation chromatography is very simple. In one sentence, it is that polymers with different molecular weights pass through the column at different times.

At the end of the chromatographic column, a signal detector that can detect polymer molecules is installed, and the signal intensity at different times is recorded. Through conversion, the molecular weight distribution of the polymer can be obtained.

There are three commonly used parameters, namely number average molecular weight, weight average molecular weight and polydispersity coefficient.

Number average molecular weight is the arithmetic mean of molecular weight;

The weight-average molecular weight is the weighted average of the molecular weight, which is numerically not less than the number-average molecular weight;

The polydispersity coefficient is the ratio of the two, greater than or equal to 1.

The closer the value is to 1, the more concentrated the molecular weight distribution is.

Take the extreme case as an example, such as a small molecular pure substance, where all the molecules have the same molecular weight, the number average molecular weight is equal to the weight average molecular weight, and the polydispersity coefficient is 1.

...

The two came to the advanced materials building, first found the teacher in charge of the GPC instrument, registered the test information, and got the room key.

As soon as he entered the laboratory, Xu Qiu saw an instrument placed in the center of the room, still humming, next to it was a computer, and there was a faint smell of solvent in the room.

"Is this the smell of tetrahydrofuran?" Xu Qiu asked uncertainly.

Chen Wanqing sniffed and said, "That's right, it's tetrahydrofuran. It's the solvent of the sample and the eluent of the chromatography, but the content is not high, so there should be no problem."

After finishing speaking, she pointed to the running instrument in the center and said:

"This is a gel chromatograph. The one we bought in our department is relatively intelligent. It can be paused at any time and new samples can be added at any time.

Because each time the instrument is turned on, there will be a fixed loss. Usually, a batch of samples is saved for testing together, and the machine is turned on once or twice a week. Depending on the number of samples, one test is performed for one to two days at a time.

We have to prepare samples here before we can test them. "

Samples were prepared in a laboratory fume hood by dissolving each polymeric material in tetrahydrofuran at a concentration of approximately 0.5-1 mg/ml.

Some samples were difficult to dissolve. Chen Wanqing pressed both ends of the centrifuge tube and shook the centrifuge tube up and down to dissolve it.

Xu Qiu also followed suit.

After about twenty minutes, all samples were well dissolved.

Then, they used a disposable syringe with a filter head to filter the solution into a special glass bottle provided by the laboratory here to complete the sample preparation.

Chen Wanqing has been trained before, so there is no problem with the operation of the instrument, and an operation manual is carefully prepared next to the instrument.

The two put the sample into the instrument, locked the door, and returned the key.

I will come over the next day to process the data and clean up the samples left here.

...

On the way back to Caiyi, Xu Qiu suddenly remembered what happened yesterday, and asked:

"Why did Han Jiaying go to Zhang Jiang to look for me yesterday? You must be bullying me."

"How is it possible? I just said that you are about to publish a big article, and then she went to join you." Chen Wanqing said:

"Although I have a good idea of ​​my teaching level, I still feel offended when she leaves without looking back."

"Really?" Xu Qiu didn't quite believe it.

"Of course I'm joking," Chen Wanqing smiled:

"I asked her to find you. I feel that if she learns from you, she will get started faster."

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