I Have a Research Support System

After Xu Qiu took a shower and returned to the dormitory, he found a new message alert on his phone.

It was the reply from my sister five minutes ago:

"I just went to take a shower. I'll go early tomorrow morning and I'll be back in the afternoon. Let's meet at the school bus stop at about 8:40."

"Okay." Xu Qiu replied.

After thinking about it, he sent another good night emoji.

The senior sister quickly returned a good night expression.

...

The next morning, the two gathered at the school bus point and took the school bus to Zhangjiang Campus.

On the way, Xu Qiu remembered the results of yesterday's high-level deduction, and said proactively:

"Sister, the monomers we bought are stored directly in the air. If they are exposed to water and oxygen for a long time, they should be broken."

"This is indeed a problem," Chen Wanqing nodded and said:

"Actually, oxygen is not afraid, as long as our monomer materials are kept away from light, because the reaction with oxygen must be under the condition of light.

The main reason is that they absorb water, which will affect the ratio of materials during the reaction, and the trimethyltin group will react slowly with water molecules at room temperature, resulting in detinning.

However, there is no glove box here in Zhang Jiang, so it is unrealistic for Mr. Wei to buy another glove box to store medicines.

You can't store the monomers in the glove box of Handan Campus. You should bring the monomer raw materials before each experiment. "

"What should I do?" She fell into thought after she finished speaking.

"I have an idea, see if this works," Xu Qiu said:

"We uniformly put the monomer raw materials into a closed tank, and then add the water remover.

In addition, nitrogen can be filled inside to maintain an inert atmosphere, and finally placed in a dark environment. "

"This method is feasible." Chen Wanqing nodded.

With the idea, she quickly reacted and added the details:

"Use color-changing silica gel to absorb moisture and act as an indicator, and add a three-way valve to vacuum the tank and fill it with nitrogen protection."

"Let's go to the drug warehouse later to see if there is a suitable container." Xu Qiu said.

...

Zhangjiang Campus, Drug Warehouse.

Chen Wanqing described her needs to Ke Yunyun.

Xu Qiu copied the drug warehouse into the simulated laboratory, and he mainly took a fancy to the glass instruments here.

Copying the drug warehouse is equivalent to having almost unlimited clean glass instruments, so you don't need to spend energy cleaning them after each experiment, which can save a lot of time.

After some negotiations, Chen Wanqing also found a suitable airtight canning container, made of thick transparent glass, with an internal volume of about one liter.

Ke Yunyun took the airtight container and introduced actively:

"This is a sealed container commonly used in chemistry laboratories to store medicines.

It has a special space at the bottom into which desiccant can be poured, and is then covered with a perforated plastic partition above.

Beakers, petri dishes, etc. can be placed above the plastic partition, and then the pharmaceutical reagents that need to be stored are put into it.

The contact part of the container and the lid has a large surface area, and a layer of vacuum silicone grease can be applied to achieve a strong vacuum sealing effect.

Finally, there is a three-way valve above the cover, which can perform suction and exhaust operations. "

"We will take one of this airtight container." Chen Wanqing said.

"Is there anything else you need?" Ke Yunyun asked after recording it in his notebook.

"Can the color-changing silica gel be used directly?"

"The color-changing silica gel belongs to the category of pharmaceutical reagents. It needs to be ordered online first, and cannot be used directly." Ke Yunyun said.

"Okay then," Chen Wanqing thought for a moment, then said:

"Take another two packs of 18cm filter paper, one pack of disposable dropper, one box of 1ml disposable syringe, two 25ml two-necked flasks, 19-necked, two."

...

With the supplies they received, the two came to the main entrance of the microelectronics building.

Xu Qiu tried his card and found that the access control had been opened, so he said casually:

"The school's administrative efficiency is quite high, and it was completed in just one day."

"I guess it's because there are relatively few procedures. You are a student of the Materials Department, so you don't need to go through a review, just add your student number." Chen Wanqing said.

On the fifth floor, Chen Wanqing first ordered two boxes of color-changing silica gel with a computer, and then the two entered the A502 laboratory.

Chen Wanqing walked in front, seeing her eagerness as she walked, as if she couldn't wait to know how her reaction to yesterday's vote would be.

Xu Qiu carried the supplies and walked behind.

He knew that there were many loopholes in the reaction process yesterday, so he was not optimistic about the results of this experiment.

However, seeing how excited the senior is, it's not easy to say anything to hurt her.

Xu Qiu had just put on the protective equipment when she heard the voice of her senior:

"ah--"

"Why is my nitrogen balloon deflated?"

"Student, why isn't your balloon deflated?"

Xu Qiu heard this and walked towards the fume hood.

He saw the nitrogen balloon above the senior sister's group of reaction devices drooping his head, which should be a problem of air tightness.

However, he was a little puzzled when he saw that his reaction device was still full of air in the balloon.

The system image that Xu Qiu compared at that time was the third-level 50% proficiency of the senior sister. At that time, there was no operation of applying vacuum silicone grease.

Thinking about it carefully, could it be that when installing the glass instrument, he turned it hard a few times, resulting in a better airtightness of the frosted interface?

After thinking for a while, Xu Qiu didn't bother with this question any more, and said to the senior sister:

"It should be that the airtightness of your system is not good, and there is a leak.

This mass-produced glass instrument, with its own frosting, cannot ensure airtightness under long-term reactions.

I think that as Ke Yunyun just said, apply vacuum silicone grease to the interface of the glass instrument to achieve the sealing effect. "

"Hmm... makes sense." Chen Wanqing said.

Xu Qiu put the previously purchased monomer materials into a sealed tank, and then found the vacuum silicone grease in the laboratory.

Since the senior has never used this thing, it should have been used by Wu Feifei or Duan Yun before.

He spreads the vacuum silicone grease where the jar meets the lid, then turns the lid to coat it evenly.

Next, connect the three-way valve on the cover to the vacuum pump, and after evacuating for a minute, adjust the three-way valve to the three-way state.

In this way, the air pressure inside the airtight tank is very low, and as long as it is checked after a period of time to see if it can still maintain a vacuum state, you can know how tight it is.

After seeing Xu Qiu dealt with it, Chen Wanqing said:

"The toluene solvent inside my reaction vessel has been evaporated to dryness, but there is still solid polymer on the side of the vessel."

"Maybe we can try to save it," Xu Qiu thought for a while and said:

"I guess it was caused by polymerization in the early stage of the reaction, when the system was still under nitrogen atmosphere. In the later stage, the balloon deflated, air entered, the catalyst was deactivated, and the reaction basically stopped.

Then add some toluene to the reaction bottle to see if it can dissolve. "

"Okay, I'll try." Chen Wanqing said.

There is another recommendation next week, which is a new urban book. Three shifts on Monday, two shifts after midnight, and one shift at four in the afternoon.