Chapter 13: Preparation solution (top)

　　 "Senior 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 suspicious: "I'll watch you do it again, come on."
"it is good."
　　 Xu Qiu put on rubber gloves, gently stepped on the pressure relief pedal with his feet, and quickly pushed his arms forward, reaching into the box with his hands. The whole process was done in one go.
　　 Later, he showed how to use tweezers to pick up substrates and reagent bottles in the glove box.
　　 Although there is a thick layer of rubber gloves, the movement is smooth and free.
　　 "Hey, slow down, pay attention to the pressure inside the cabinet." Chen Wanqing was still worried at first, but then turned into amazement:
　　 "Hey, why are you so skilled."
　　 "Maybe I am the only scientific research genius." Xu Qiu joked.
　　 Chen Wan gave him an innocent look, but thinking about his performance in the past few days, I also feel that he is right to say so.
　　 Then she thought: "I am now half of his mentor, and he can be trained to not only help me with experiments, but in the future, I might even get a couple of two papers and even one."
During the postgraduate period, the relationship between the tutor and the student is more like the relationship between the teacher 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 mentor .
　　 Chen Wanqing became happier as she thought about it, and the smile on the corner of her mouth couldn't hide her.
　　 "Senior Sister, Senior Sister, what's the matter with you." It was the first time Xu Qiu saw Senior Sister smile so unrestrainedly.
　　 Chen Wanqing also realized her gaffe, and immediately recovered from her fantasy, and returned to her former indifferent appearance.
　　…………
　　 [The solution preparation skills are detected, whether to record? 】
　　 "Record."
　　 "Today, I teach you to prepare two solutions, one is the zinc oxide prepolymer solution, and the other is the benchmark effective layer solution."
"First is the zinc oxide prepolymer solution. The formula is to dissolve 1.0 g of zinc acetate dihydrate in 10 ml of 2-methoxyethanol, then add 0.28 g of 2-hydroxyethylamine stabilizer, and stir for 2 hours at 60 degrees Celsius. the above."
　　……
　　"Then 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 　　 school sister finished teaching, Xu Qiu started practical exercises.
　　 The persimmon must be picked up and pinched 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 white glass bottle with a capacity of 20 ml as a container for the solution to be prepared, placed it on the balance, and peeled it off.
　　 Then turn on the heating stirring table and adjust its set temperature to 60 degrees Celsius.
　　 Next, from the reagent rack, find the reagent bottle containing zinc acetate dihydrate, unscrew the cap, scoop out the white crystal zinc acetate dihydrate with a spoon, and weigh it with a balance.
　　 Take the first spoon down, the balance reading becomes 0.2803 grams;
　　 Take the second spoon down, 0.5716 grams;
　　 the third spoon down, 0.8462 grams;
　　 When adding the last spoonful, Xu Qiu used the thumb and index finger of his right hand to pinch the handle of the medicine spoon and place it above the mouth of the white glass bottle, then gently shake his right hand and tap the medicine spoon.
　　 With the vibration of the medicine spoon, the crystals of zinc acetate dihydrate dropped into the bottle little by little, and the indicator of the balance rose slowly.
　　0.8813g, 0.9316g, 0.9683g, 0.9902g...
　　 was just a little bit closer, Xu Qiu held his breath and continued to tap the medicine spoon gently.
"Snapped."
　　 A large piece of zinc acetate dihydrate crystal fell from the medicine spoon, and the balance reading became 1.0503 grams.
"I!"
　　 Medicines weighed too much cannot be put back into the original reagent bottle, but they can be taken out and discarded.
　　 Although there was a little accident, Xu Qiu felt that the problem was not big.
　　 Now that one more raw material is added, then the other raw materials can be added in equal proportions.
　　He is doing calculations fast in his head:
　　101.05=10.5, which means adding 10.5ml 2-methoxyethanol.
　　0.281.05=0.294, add 0.294g 2-hydroxyethylamine.
　　 Found 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 volume measurement error is relatively large, he chooses to directly weigh the mass, after conversion, 10.50.96=10.08g.
　　 Take out a disposable dropper, Xu Qiu firmly presses the head of the dropper, and then stretches it into the 2-methoxyethanol reagent bottle. After loosening it again, the dropper the liquid.
　　 The dropper itself is scaled, from 0 to 2.5ml, with a scale every 0.5ml, but the accuracy is not guaranteed and can only be used for estimation.
　　 Peel the balance again, and Xu Qiu added 2.5 ml three times and 2 ml once.
　　 At this time, the balance reading is 9.1024 grams.
　　 He took another tube of liquid and slowly dripped it into the bottle.
　　 There was no change this time, and the balance reading stabilized at 10.8202 grams.
　　 But with the passage of time, the indication is gradually decreasing at 0.0001 grams, which is due to the volatilization of the liquid.
　　 Next, 0.294 g of 2-hydroxyethylamine was added.
　　 2-Hydroxyethylamine is also a liquid. Xu Qiu took apart a 1ml disposable syringe, also called a syringe, and drew about 0.5ml of 2-hydroxyethylamine from the reagent bottle.
　　 peeled the balance again. He slowly pushed the plunger of the syringe, and the liquid dripped from the needle into the bottle.
　　 The final reading is 0.2906 grams.
　　 has a certain error, but it is within an 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, capped the bottle, and marked "ZnO prepolymer, prepared by 6.5" on the bottle with a marker.
　　 At this time, the temperature of the heating and mixing table has reached the set 60 degrees Celsius, and UU Reading www.uukanshu.com vibrates between 55 and 65 degrees.
Xu Qiu put the prepared solution in the center of the heating stirring table, then wiped the spoon with lens cleaning paper, squeezed the waste liquid from the used dropper and syringe into the waste liquid bucket, and removed the needle from the needle The tube and dropper are thrown into the trash can, and the needle is put in a protective cover and placed in a special box to complete the finishing work.
　　 He opened the system interface and checked the harvest.
　　【Scientific Research Support System】
　　 Permission level: 1
　　 Points: 478
　　 Tasks in progress: 1
　　 Proficiency:
　　【Experimental operation class】
　　 Cleaning the substrate (fourth order 1%/fourth order 50%, ultrasonic cleaner, tweezers, nitrogen gun required)
　　 solution preparation (first order 0%/fourth order 50%, need glove box, heating mixing table, disposable syringe, medicine spoon, pipette)
　　【Instrument equipment tools】
　　Ultrasonic cleaner (fourth order 80%/fifth order 0%)
　　 Tweezers (fourth order 9%/fourth order 50%)
　　 Nitrogen gun (fourth order 1%/fourth order 50%)
　　 Glove Box (Level 4 10%/Level 4 80%)
　　Gas cylinder (first order 0%/fourth order 20%)
　　 heating mixing table (second order 30% / fifth order 0%)
　　 Disposable syringes (second order 20% / fourth order 70%)
　　 medicine spoon (30% for second order / 70% for fourth order)
　　 Pipette gun (first order 0%/fourth order 80%)
　　【Special category】
　　 Literature reading (first-level 72%/fourth-level 50%)
　　 Novice Task IV: Raise the proficiency of any two experimental operations to Tier 4 or above, and reward 500 points for completing the task.
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