I Have a Research Support System

Chapter 13 Preparation of Solutions (Part 1)

Sister, I have almost mastered the operation of the glove box, please teach me the next experiment. Xu Qiu said.

Really? Chen Wanqing was a little dubious: I'll watch you operate it from the side, come on.

good.

Xu Qiu put on rubber gloves, lightly stepped on the decompression pedal with his feet, and quickly pushed his arms forward, putting his hands into the box, and the whole process was done in one go.

Later, he demonstrated operations such as picking up substrates and reagent bottles with tweezers in the glove box.

Although it is separated by a thick layer of rubber gloves, the movements are smooth and free.

Hey, slow down, pay attention to the pressure inside the box. Chen Wanqing was still worried at first, but then turned into amazement:

Hey, why are you so proficient.

Maybe I'm the one-in-a-million research genius. Xu Qiu joked.

Chen Wan gave him an innocent look, but after thinking about his behavior in the past few days, she also felt that what he said seemed to be right.

Then she thought again: I'm now his half-mentor. Cultivating him will not only help me with my experiments, but may also allow me to write second works on several papers in the future.

During the postgraduate period, the relationship between the tutor and the student is more like the relationship between the master and the apprentice, rather than the teacher-student relationship in the general sense, and Teacher Wei does not personally guide Xu Qiu, so the senior sister is equivalent to Xu Qiu's tutor .

The more Chen Wanqing thought about it, the happier she became, until she couldn't hide the smile on the corner of her mouth.

Senior sister, senior sister, what's the matter with you. It was the first time Xu Qiu saw her senior smile so boldly.

Chen Wanqing was also aware of her gaffe, and immediately recovered from her fantasy, and returned to her previous indifferent appearance.

…………

[Solution preparation skill detected, is it recorded? 】

Record.

Today, I will teach you to prepare two solutions, one is the zinc oxide prepolymer solution, and the other is the reference effective layer solution.

The first is the zinc oxide prepolymer solution. The formula is to dissolve 1.0 grams of zinc acetate dihydrate in 10 milliliters of 2-methoxyethanol, then add 0.28 grams of 2-hydroxyethylamine stabilizer, and stir at 60 degrees Celsius for 2 hours. above.

...

Then there is the reference effective layer solution, the formula is to mix 10 mg of P3HT and 10 mg of PC[60]BM, dissolve in 1 ml of dichlorobenzene solution, and stir overnight at 60 degrees Celsius.

...

After the senior sister finished teaching, Xu Qiu did the practical exercises.

The soft persimmons should be picked first. After comparing the preparation process of the two solutions, he chose to prepare the less difficult zinc oxide prepolymer solution first.

He first took out a 20ml white glass bottle as a container for the solution to be prepared, put it on the balance, and peeled it.

Then turn on the heating and stirring table, and adjust its set temperature to 60 degrees Celsius.

Then find the reagent bottle containing zinc acetate dihydrate from the reagent rack, unscrew the bottle cap, scoop up the white crystalline zinc acetate dihydrate with a medicine spoon, and weigh it with a balance.

After the first scoop, the balance shows 0.2803 grams;

The second spoon down, 0.5716 grams;

Go down the third spoon, 0.8462 grams;

When adding the last spoonful, Xu Qiu pinched the handle of the medicine spoon with his right thumb and index finger, placed it above the mouth of the white glass bottle, then shook his right hand lightly, and slapped the medicine spoon.

With the vibration of the medicine spoon, the crystals of zinc acetate dihydrate fell into the bottle little by little, and the indication of the balance also rose slowly.

0.8813 grams, 0.9316 grams, 0.9683 grams, 0.9902 grams...

Just a little bit away, Xu Qiu held his breath and continued to pat the medicine spoon lightly.

Snapped.

A large crystal of zinc acetate dihydrate fell from the medicine spoon, and the balance read 1.0503 grams.

I*!

The over-weighed medicine cannot be put back into the original reagent bottle, but it can be taken out and discarded.

Although there was a little accident, Xu Qiu felt that it was not a big problem.

Since one more raw material is added, it is enough to add the other raw materials in equal proportions.

He quickly calculated in his mind:

10*1.05=10.5, that is, add 10.5 ml of 2-methoxyethanol.

0.28*1.05=0.294, 0.294 grams of 2-hydroxyethylamine should be added.

Finding the reagent bottle of 2-methoxyethanol, Xu Qiu found that the density was marked on it, which was 0.96 grams per milliliter.

Because the error in volume measurement is relatively large, he chose to weigh the weight directly. After conversion, 10.5*0.96=10.08 grams.

Taking out a disposable dropper, Xu Qiu pressed the head of the dropper firmly, then inserted it into the 2-methoxyethanol reagent bottle, and after releasing it again, the liquid was sucked into the dropper.

The dropper itself has a scale, from 0 to 2.5 ml, with a scale every 0.5 ml, but the accuracy cannot be guaranteed and can only be used for estimation.

Tare the balance again, and Xu Qiu added 2.5ml liquid three times and 2ml liquid once.

At this time, the balance shows 9.1024 grams.

He drew another tube of liquid and slowly added it dropwise to the bottle.

This time there was no change, and the balance showed a stable value of 10.0820 grams.

However, with the passage of time, the indication is also slowly decreasing by 0.0001 grams, which is due to the volatilization of the liquid.

Next, 0.294 grams of 2-hydroxyethylamine was added.

2-Hydroxyethylamine is also a liquid. Xu Qiu disassembled a 1ml disposable syringe, also known as a syringe, and extracted about 0.5ml of 2-Hydroxyethylamine from the reagent bottle.

Tare the balance again, he slowly pushes the push rod of the syringe, and the liquid drips from the needle into the bottle drop by drop.

The final reading was 0.2906 grams.

There are certain errors, but within the acceptable range.

Finally, Xu Qiu took out a shuttle-shaped magnetic stirrer with a length of about 1.5 cm, put it into a white glass bottle, closed the bottle cap, and marked ZnO prepolymer, prepared in 6.5 on the body of the bottle with a marker pen.

At this time, the temperature of the heating and stirring table has also reached the set 60 degrees Celsius, oscillating between 55 and 65 degrees.

Xu Qiu put the prepared solution in the center of the heating and stirring table, then wiped the medicine spoon with lens tissue, squeezed the waste liquid in the used dropper and syringe into the waste liquid bucket, and put the needle with the removed needle into the waste liquid bucket. The barrel and dropper are thrown in the trash, while the needle is wrapped in a protective case in a special box to finish the job.

He opened the system interface to check the harvest.

【Scientific Research Auxiliary System】

Privilege Level: 1

Points: 478

Tasks in progress: 1

Proficiency:

【Experimental operation class】

Clean the substrate (fourth stage 1%/fourth stage 50%, require ultrasonic cleaner, tweezers, nitrogen gun)

Solution preparation (first stage 0%/fourth stage 50%, glove box, heating and stirring table, disposable syringe, medicine spoon, pipette gun are required)

【Instrument Equipment Tools】

Ultrasonic cleaner (fourth stage 80%/fifth stage 0%)

Tweezers (fourth order 9%/fourth order 50%)

Nitrogen gun (4th stage 1%/4th stage 50%)

Glove box (fourth order 10%/fourth order 80%)

Gas Cylinders (Level 0%/Level 20%)

Heating stirring table (second stage 30%/fifth stage 0%)

Disposable Syringes (Second Stage 20%/Fourth Stage 70%)

Medicine Spoon (Second Stage 30%/Fourth Stage 70%)

Pipette gun (1st stage 0%/4th stage 80%)

【Special class】

Literature reading (Level 72%/Level 50%)