I Have a Research Support System

"I have a question. In the literature, methanol, acetone, and n-hexane are usually extracted separately. Why do we use mixed solvents?" Xu Qiu said.

"It is indeed better to use the three solvents to extract separately," Chen Wanqing said:

"However, it needs to be replaced every few hours, which is difficult for us who conduct experiments across campuses.

Considering that the boiling points of the three solvents are not much different at about 60-70 degrees Celsius and can form an azeotrope, I simply mixed them and extracted for 24 hours. "

"There is another question. I see that they do the synthesis. Finally, they will use chloroform to extract the polymer, and then drop it into methanol to precipitate it. Should we also try it?" Xu Qiu said.

"Using chloroform for Soxhlet extraction is estimated to take more than 250 ml. Chloroform is quite toxic, and I'm not sure about the specific effect, so I didn't dare to use it before." Chen Wanqing

Xu Qiu nodded to express his understanding, and he also thought in his mind:

If it is extracted with chloroform, there will be a risk of chronic poisoning, but there is a chance to improve the performance of the material, will he use it?

...

Or think about it later.

Putting this question behind him, Xu Qiu started to build the Soxhlet extraction device.

Add 200 ml each of methanol, acetone, and n-hexane into a 1-liter Erlenmeyer flask, and put a magnetic stirring bar.

Then, wrap the product obtained by the previous filtration with filter paper, put it into the extractor, connect the spherical condenser tube, and connect the condensed water.

Finally, set the temperature of the oil bath to 75 degrees Celsius and start stirring.

...

After the device here was started, the toluene indicator of the redistilled toluene device over there also turned blue.

Xu Qiu collected about 50 milliliters of toluene, shut down the redistillation device, and allowed the toluene in the solvent distillation head to cool down slowly.

Then, he went to verify the airtightness of the vacuum tank, and found that it still had a high degree of vacuum after being placed for a whole morning, which indicated that the vacuum silicone grease seal was very effective.

After telling the senior sister the news, he evacuated the vacuum tank again, filled it with nitrogen, and put it in a dark cabinet for storage.

The time has reached twelve noon.

The two finished the morning experiment and returned to A501. After washing their hands, Xu Qiu reminded:

"Sister, I need to talk to Teacher Wei about the oil bath."

"That's right, I almost forgot." Chen Wanqing called Teacher Wei.

Xu Qiu looked at her phone screen curiously, and the note she gave Teacher Wei was "wei".

When the call was connected, she turned on the speakerphone.

"Hey, what's the matter?"

"The number of oil baths in Zhang Jiang's laboratory is not enough. I want to buy a few more."

"How much does it cost?"

"I haven't checked yet..."

"Taobao is about four to five hundred," Xu Qiu hurriedly interjected:

"If we do the reaction continuously, we need one for redistillation of toluene, one for Soxhlet extraction, and one or two for reaction. Two people are definitely not enough."

"Okay, let's buy it.

The unit price of the equipment is less than 1,000, so it doesn’t need to be a fixed asset. Chen Wanqing, you pay first, and then let me know after paying, and I will transfer the money to you.

Remember to ask them to issue a VAT invoice, and leave a screenshot of the payment voucher, don't forget it. "

Teacher Wei paused and said:

"By the way, how is your experiment doing?"

Chen Wanqing felt guilty and looked at Xu Qiu.

Xu Qiu spread his hands.

"We are dealing with yesterday's response, and we don't know the result yet. We plan to vote for another response today." Chen Wanqing said lightly.

"Okay, you two, be careful."

After speaking, Teacher Wei hung up the phone.

Chen Wanqing took a long breath and said:

"I didn't expect him to ask about the experiment. I wasn't prepared at all."

"Let's be honest, how can experiments always be successful?"

During the phone call, Xu Qiu had already found an oil bath pot with good reviews on Taobao.

He handed the phone to Chen Wanqing and said:

"Senior sister, what do you think of this store? I see that the reviews are all good."

Chen Wanqing flipped through the introduction and comments for a while, and said:

"This one looks okay, how many are we going to buy?"

"Four channels, considering the extreme situation where each of us casts two responses, and Duan Yun may also use it." Xu Qiu said.

"Then let's have four. Send me the link, and I'll chat with the customer service to see if we can negotiate a price." Chen Wanqing said.

After Xu Qiu sent the link, the two headed towards the cafeteria.

...

The Zhangjiang canteen has two floors, but the number of windows is less than that of the first floor of the Handan canteen.

But at the same time, there are fewer students eating here.

The contractors are also different. There are more dishes here, but the price is a little more expensive.

Xu Qiu ordered a vegetable rice bone soup with braised short ribs, while Chen Wanqing took a small bowl of steamed vegetables with two vegetables and one meat.

After finding a seat and sitting down, Chen Wanqing took out her mobile phone to contact Taobao customer service.

"The customer service said that you can get a discount if you buy four sets. The original price is 1,800 yuan, and the discount is 200 yuan. However, you need to pay 6% more when you issue an invoice, so the final price is 1,696 yuan."

Xu Qiu nodded. It is also an unspoken rule to pay more for invoices.

Seeing the senior put away the phone, he asked:

"Aren't you going to report to Teacher Wei?"

"Let's talk about it later."

"Are we going to pay in advance for such a small instrument?"

"That's right, for such a small amount, we usually pay in advance by ourselves, and then ask Mr. Wei for the money. If the amount is large, we can ask him in person and ask him to pay.

Anyway, whoever pays is the same, and can be reimbursed later. "

"Is it reimbursed with the money in the fund project?"

"That's right, most of them are reported for materials.

Like the oil bath we plan to buy, although it is an instrument, but because the amount is too small, it also costs materials.

Teacher Wei delegated the power to Wu Feifei to be responsible for the finances, but she couldn't handle all the reimbursements.

Therefore, we agreed who bought the things and who was responsible for reimbursement.

For reimbursement, the steps are relatively cumbersome.

You have to wait for the invoice to come, then fill out the appointment reimbursement form online, and wait for the department and the finance office to review it.

After passing the review, we will print out the appointment reimbursement form, together with the invoice and other supporting materials, such as payment vouchers, and submit them to the financial department.

The Finance Department will review whether the materials are complete again, and only after the review will the account be paid.

The whole process usually takes more than a week.

When I was studying for a master's degree in the early years, it was not so strict, but now the requirements for reimbursement are getting stricter. "

After listening to what the senior sister said about the reimbursement situation, Xu Qiu thought that the threshold for entering colleges and universities is getting higher and higher.

If you want to get into a better one as a teacher, you basically need more than two years of overseas study experience.

The current field of scientific research has gradually transitioned from the blue ocean to the red ocean unconsciously.

Guo Jia's tightening of financial reimbursement is also one of the manifestations.

In the early years, scientific research talents were very scarce, so some people made small moves in financial reimbursement, and the higher authorities turned a blind eye.

Now, although there is still a shortage of high-end scientific research talents, with the continuous introduction of talents from overseas and the cultivation of domestic talents, basic scientific research workers are no longer so scarce, and there is an increasing trend.

Naturally, I will not tolerate people who engage in petty tricks anymore, and it may not be certain that they will settle accounts after the fall.

Please ask for a recommendation ticket.