Chapter 14: Prepare solution (below)

　　 During the experiment, Xu Qiu actively turned off the system's proficiency prompt.
　　 Because there are more equipment and tools needed now, if the system is turned on for real-time reminders, a lot of redundant information will be generated and distract him.
　　 In addition, he found that not all the equipment and tools used will be included in the system.
　　 For example, the disposable dropper used just now was not included. It may be because it is too simple to enter the system.
After a little rest, Xu Qiu began to prepare a P3HT:PC[60]BM solution in dichlorobenzene.
　　 He first took out a 4 ml brown glass vial, put it on the balance, and peeled it off.
　　 This small brown bottle has a taller body, but the bottom of the bottle is very small, about the size of a thumb cap.
　　 Then, he found the reagent bottle containing P3HT and unscrewed the bottle cap.
　　P3HT is a kind of conjugated polymer material, which is fibrous. It is a large piece of glue in the state of the reagent bottle, so it needs to be peeled off manually with tweezers.
　　 Xu Qiu picked up a pair of pointed tweezers in each of his left and right hands. He weighed P3HT for the first time and couldn't accurately measure its quality, so he tried to tear off a small root and put it into a small brown bottle carefully.
　　The balance shows 0.0013 grams, which is 1.3 mg.
　　 Tear off the larger one again and put it in.
　　The balance shows 0.0046 grams.
　　 got another piece of the same size and put it in.
　　The balance shows 0.0081 grams.
　　 is still 1.9 mg. Xu Qiu estimated the approximate amount needed in his mind, then tore out a suitable P3HT fiber and put it in a small brown bottle.
　　The balance reading fluctuated back and forth between 0.0999g and 0.01003g for more than ten seconds, and finally stabilized at 0.01002g.
　　 Huh, good luck.
　　According to the senior sister, when weighing this conjugated polymer, it is very easy to exceed the expected mass, which is why it is weighed first.
　　 He was already ready to calculate again, but he didn't expect it to be so accurate.
　　 Next is to weigh PC[60]BM.
PC[60]BM is a derivative of C-60 fullerene. It is chemically modified on the spherical molecule of C-60 to connect a phenyl group and a butyl ester group to make it soluble in organic solvents, such as Chlorobenzene, chloroform, dichlorobenzene, etc.
　　 Its main physical and chemical properties are determined by C-60, so it is a black solid powder.
　　 There is no difficulty in weighing this, and Xu Qiu quickly said it.
Then, he added a rice grain-sized magnetic stirrer to the small brown bottle, capped the bottle, and gently tapped the bottom of the bottle vertically downwards to shake the P3HT fibers adsorbed by static electricity on the bottle wall to the bottom of the bottle. .
　　 Finally, he found a dichlorobenzene reagent bottle with a molecular sieve. Using a 1 ml disposable syringe, he extracted about 1.5 ml of dichlorobenzene in two times and added it to a 4 ml empty centrifuge tube.
　　 Place the centrifuge tube on the centrifuge tube rack, and use a 200 μl pipette to transfer the liquid 5 times to the small brown bottle.
After the solution preparation is complete, Xu Qiu screwed the cap tightly, and then wrote "P3HT:PCBM, 1:1, DCB, 6.5" with label paper, and stuck it on the bottle body, insert the small brown bottle into the iron bottle holder, and place it under heating Finally, clean up the experimental garbage.
　　……
　　 Xu Qiu glanced at the system interface, and the solution preparation proficiency had only risen to the second-order 20%, which was far from the fourth-order.
　　To get this proficiency, he must use the medicines in the laboratory. Although he does not know their specific prices, he still knows where they will not be cheap, so he can't just waste it.
　　 He decided to "seek help" senior sister.
　　 "Senior sister, I have prepared these two solutions, do you have any solutions that need to be configured? I can help you."
　　 Chen Wanqing thought about it. Recently, she was sorting out the experimental data. After the previous solution was used up, she didn’t have time to make it. She said:
　　 "How embarrassing is this, then I will write to you."
　　 She wrote the request on the post-it note, and then pasted it on the glass of the glove box.
　　##
　　P3HT:PC[60]BM:PC[70]BM
　　W/w/w
　　1:1:0
　　1:0.8:0.2
　　1:0.6:0.4
　　1:0.4:0.6
　　1:0.8:0.2
　　1:0:1
　　 1mL each.
　　##
　　 "Can you understand?" Chen Wanqing said.
　　 "If I understand correctly, it should be the preparation of six sets of solutions based on P3HT:PC[60]BM:PC[70]BM, the mass ratios are..., 1mL each, right." Xu Qiu said.
　　 "Smart, if you think it is too much, you can only match the first and sixth, and I will do the rest." Chen Wanqing said.
　　 "Not much, not much, just leave it to me." Xu Qiu said hurriedly.
　　 "Then please." Chen Wanqing said.
After 　　, she returned to her seat happily.
　　 It feels so good to have such a younger student who
can be taught as soon as he teaches, but also take the initiative to work
.
　　……
　　 Xu Qiu began to analyze:
It looks like there are six sets of solutions, but in fact, you only need to configure the first and sixth solutions as mother liquors, and then mix the two mother liquors in a volume ratio of 8:2, 6:4, 4:6 and 2:8 to get The other four solutions.
　　Although this method has errors due to changes in solution density, it can be ignored.
　　 However, he lacks proficiency now, this simple method is not suitable for him.
　　 He decided to use the dumbest method, which is to prepare bottle by bottle.
　　 This time I used a new drug, PC[70]BM. Its molecular structure is to change the C-60 in PC[60]BM to C-70, and its physical and chemical properties are not much different from PC[60]BM.
　　 So the overall difficulty of solution preparation has not increased too much.
　　……
　　 It took about an hour, and Xu Qiu prepared all six bottles of the solution.
　　 When he left the glove box, the rubber gloves were covered with sweat, and its lab coat was already soaked.
Although the indoor temperature can be maintained at about 20 degrees under the action of air conditioning, the inside of the glove box is a relatively independent environment, and the heat exchange efficiency with the outside is very low, and the heating stirrer is always turned on, so the temperature in the glove box is approaching 40 Celsius. UU reading www.uukānshu. com
　　 He did not leave in a hurry, and treated the sweat on the rubber gloves with talcum powder according to the method taught by the senior sister, and then opened the system page.
　　【Scientific Research Support System】
　　 Permission level: 1
　　 Points: 978
　　 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 (fourth order 5%/fourth order 50%, need glove box, heating stirring table, disposable syringe, medicine spoon, pipette)
　　【Instrument equipment tools】
　　Ultrasonic cleaner (fourth order 80%/fifth order 0%)
　　 Tweezers (fourth order 15%/fourth order 50%)
　　 Nitrogen gun (fourth order 1%/fourth order 50%)
　　 Glove Box (Tier 4 25% / Tier 4 80%)
　　Gas cylinder (first order 0%/fourth order 20%)
　　 Heating and mixing table (fourth order 10%/fifth order 0%)
　　 disposable syringe (fourth order 5%/fourth order 70%)
　　 medicine spoon (fourth order 10%/fourth order 70%)
　　 Pipette gun (fourth order 20%/fourth order 80%)
　　【Special category】
　　 Literature reading (first-level 72%/fourth-level 50%)
　　 Novice Task V: Raise the proficiency of any four experimental operations to Tier 4 or above, reward 1000 points for completion of the task, and start advanced tasks.
　　##
　　The proficiency of solution preparation reached the fourth level, and the novice task IV was completed.
　　 A new mission appeared again. This seems to be the last novice mission. After completion, the advanced mission can be opened.
　　 Xu Qiu began to look forward to it.