Chapter 171: Heating type homogenizer

"I have a scientific research support system ( to find the latest chapter!
On Wednesday morning, when Xu Qiu was in class, he received a short message that the heating glue machine "borrowed" from Gong Yuanjiang had been delivered to Caiyi by express.
So, after he finished eating at noon, he hurried to Caiyi.
Because he often came to get the courier, he and the concierge were all acquainted with each other, and after saying hello, he took out the instrument.
The concierge is on the second floor of Caiyi, on the same floor as Teacher Wei's laboratory. There are two guards in rotation. They work very leisurely, but the accommodation conditions are somewhat unsatisfactory.
A double bed with upper and lower bunks, surrounded by a mosquito net that is not slippery but relatively complete.
There is no air conditioner in the room, instead of an electric fan and a heater.
There is also an obsolete desktop computer that uses dial-up Internet access. You can usually play chess or something online.
The specific work content of the concierge is to help with the delivery, take care of the keys of the rooms in the whole building, and be responsible for opening the door around 7 in the morning and locking the door around 10 in the evening.
The door lock here is not a lock in the true sense, but the door cannot be opened directly. It can still be opened with the campus card that opens the door.
...
Xu Qiu looked at the heating glue machine instrument sent by Gong Yuanjiang's research group and found that it was packed in an ordinary carton.
On the top of the carton, there are four large characters "this side up" written with a black marker, and several upward arrows are drawn on the side.
He tried to pick up the carton, and found that it was a little heavy, so he gave up the idea of ​​carrying the box back directly, and chose to drag the carton by the straps on the edge of the carton and drag it all the way from the concierge to the door of the 216 laboratory.
It is half past 12 noon.
Chen Wanqing, Wu Feifei and other graduate students returned to the dormitory to rest after lunch, and only Han Jiaying stayed in the laboratory.
She heard the movement outside the door, got up to open the door, saw Xu Qiu and the carton next to him, and asked curiously:
"Brother, what is this?"
"Guess what." Xu Qiu didn't explain.
The school girl pursed her mouth, thought for a moment, her tone was uncertain:
"Could it be that I asked Teacher Gong to borrow the heating glue machine last week?"
"It's smart, it's the heating glue machine. Just arrived in the morning. You reminded me that I want to send them a text message."
Immediately, Xu Qiu added:
"By the way, you can help me get a pair of scissors, find a clean one, don't use it in the laboratory."
"Okay, no problem." Han Jiaying agreed happily.
During this period of time, she was doing hot spin coating experiments almost every day, and the failure rate was roughly 10%-20%. Compared with other experimental methods, the failure rate was relatively high.
The use of a heating homogenizer for experiments can theoretically greatly reduce the failure rate of the experiment.
Therefore, she has been looking forward to this instrument for a long time.
Seeing her cheering, Xu Qiu edited the text message while saying:
"Don't be too happy too early. With a new instrument, some of the previous conditions can't be used directly. You need to explore the conditions again."
"Yes, the processing temperature needs to be adjusted again, and the spin coating technique has to be adapted again, which is a bit troublesome."
Han Jiaying frowned, but soon stretched out and said:
"The time cost for exploring the conditions is fixed, and the increase in experimental efficiency brought by the instrument is permanent, and it is cost-effective in the long run."
"That's natural, otherwise we won't take the effort to get one back." Xu Qiu smiled, it seems that the school girl's mind is still quite fast.
He sent the edited text message to the contact person on Teacher Gong's side, "The instrument has been received, thank you." This time the other party did not reply in seconds.
Not long after, Han Jiaying returned and handed over a pair of clean scissors with black plastic handles.
Xu Qiu took it directly, cut the straps on the outside of the box, and cut the sealing tape above the box.
For the scissors handed over by the school girl, he was more at ease with it.
If it was the senior sister, I would be more assured. Her experiments may often cause problems, but safety-related matters have never been vague.
But if Tian Qing handed it over, then you have to weigh it carefully.
Tian Qing is very carefree, using the tools such as scissors, tape and screwdriver in the laboratory, occasionally she doesn't wear gloves.
Because the tools that have entered the laboratory, such as scissors and tape, in principle, you cannot leave the laboratory, and you must wear gloves before use to prevent contact with possible chemicals, so there is a safety hazard in her approach. .
Fortunately, the laboratory on the Handan campus is not a laboratory that prefers chemical experiments. Most of the reagents used are not toxic. The main experiments are also carried out in the glove box. Therefore, if you wash your hands after the experiment, There is nothing serious.
Unless you have the habit of chewing your fingers, then...
...
Han Jiaying did not rush back to the desk, but curiously leaned towards the express carton.
She wanted to have a quick glance to see what this new instrument looked like.
Xu Qiu looked at her and didn't say anything. For scientific researchers, being curious is not a bad thing.
The homogenizer is composed of two parts, one is a spin-coating platform, including a spin-coating cabin, console, heating plate, etc., and the other is a mechanical pump.
Judging from the weight of the box, they should have mailed a complete set of equipment, including the mechanical pump and spin-coating platform. Because the core component of the spin-coating platform itself is relatively light, they can never just send a mechanical pump. .
Xu Qiu opened the box, it was not a bare metal inside.
The inner surface of the box is also covered with a foam shell, which is also glued with sealing tape.
The protection is really in place, Xu Qiu secretly complained.
Then he cut open the sealing tape at the joint with scissors and removed the upper foam shell.
But I still can't see the machine, because there are many sponge-like fillings inside, which occupy the entire box.
"Brother, they packed it carefully, a bit like expressing home appliances." Han Jiaying was surprised.
"Yes, but this is much more expensive than looking for home appliances. Although I have not asked the price, it is estimated to be tens of thousands. repair."
Xu Qiu explained while trying to take out the instrument.
But the instrument was buried in the filling, and the specific location was not visible. He thought for a while, and put his hand in to search for it slowly.
It feels a bit like drawing a prize from a lottery box.
In fact, you can also pour out all the fillings, which is much easier to find, but it is more troublesome to pour the fillings back later.
After some groping, Xu Qiu finally reached the two corners of the instrument. He firmly grasped the two corners and slowly lifted the instrument.
It is not very heavy, and from the outline of the instrument, it can be judged that he is holding a spin-coated platform.
He carefully put the spin-coating platform he took out on the ground, and threw the spilled foam filling back into the carton.
This is an all-in-one machine, which has been installed. It is not a part type and needs to be installed manually.
Xu Qiu reached out again, and according to expectations, there should be a mechanical pump buried inside.
However, after touching for a long time this time, what I touched was either the sponge filling, the foam shell on the edge, or the cardboard at the bottom.
Where did the mechanical pump go?
After thinking about it carefully, he found Huadian, cardboard?
There is a foam shell at the top and a foam shell at the bottom. It makes no sense that there is only a layer of cardboard.
Xu Qiu thrust down hard, and the cardboard moved.
This carton is still a double-layer structure.
Since the upper layer is a spin-coating platform, the lower layer is naturally a mechanical pump. It should be to avoid collision between the two during transportation, so they are deliberately separated.
After knowing the structure of the box, he didn't spend much time and took out the cardboard from the edge of the box, and then the mechanical pump was also taken out.
In addition, he also touched a large plastic bag with a gas pipe and some copper metal parts to connect the mechanical pump and the spin-coating platform.
Seeing Xu Qiu touching the box, Han Jiaying couldn't help asking: "Brother, what are you looking for?"
"Instructions, no instructions..." Xu Qiu fumbled in the box for a while, confirmed that there were no other items in it, and had to give up.
"Perhaps they forgot to let it go, or send a text message to ask them?" Han Jiaying suggested.
"It's possible," Xu Qiu looked at the phone, but the other party still didn't reply to the message. After thinking about it, he said:
"It is also possible that the instrument is very simple and does not require instructions. Let's try to install it first."
"Okay." Han Jiaying said happily.
...
The two picked up the mechanical pump and spin-coating platform and entered the laboratory.
With the help of the large transfer cabin on the side of the glove box, Xu Qiu introduced the heated spin-coating platform that had just arrived.
The vacuum pump does not need to be transported into the glove box and is left outside.
Although the big teleportation cabin has always been there, Han Jiaying has never used it, so she always subconsciously ignores its existence.
She curiously watched Xu Qiu click on the control screen and operated the large teleportation cabin to pump and deflate.
Xu Qiu also noticed her gaze and actively explained:
"This large cabin is indeed used less in normal times, but it cannot be done without. Otherwise, the glass of the glove box must be removed to operate the transmission of such a large instrument.
And when you don’t do experiments for a long time, such as during holidays, you can also store medicines in the cabin. "
Han Jiaying nodded, and then spit out: "It's such a large volume, and three pumps and three rows are required, which is a bit of nitrogen."
"Compared to the small transmission cabin, it is naturally wasted, but the absolute amount is actually not much. With a large cabin, the nitrogen consumption is definitely less than one tenth of a bottle." Xu Qiu said:
"Moreover, nitrogen is not very expensive. A bottle of high-purity nitrogen is 100 yuan. If we do experiments at full capacity, we will use more than ten bottles a month, which is just over 1,000 yuan."
"Yes, it is much cheaper than the optoelectronic materials we use. In other words, why are polymer donors such as PTB7-TH so expensive?" Han Jiaying wondered:
"It costs more than 10,000 1 gram domestically, and even more than 30,000 1 gram imported from Europe."
"Well, it's actually normal, just one willing to fight and one willing to suffer," Xu Qiu continued to explain:
"Niche businesses do not have many manufacturers, and only specific research institutions have purchase needs. Research institutions use scientific research funds, not the researchers’ own money. It is not so distressing to use, unless it involves the transfer of benefits. Generally, there will be no supervision.
For various reasons, the price of this type of commodity is in most cases higher than its actual value. As for the specific premium, it is a game between manufacturers and purchasers of research institutions.
But it is not enough to say that it is profitable, because the audience is very small, and the research hotspot may change at any time, and a bunch of materials have been synthesized with hard work. If it can't be sold, it is worthless. "
"It makes sense, do manufacturers like these optoelectronic materials also have patent restrictions?" Han Jiaying asked again.
Xu Qiu has never applied for a patent, but he still knows a little about this aspect. He explained:
"Patents are generally aimed at fields of application value. Organic photovoltaics are still in the laboratory stage and are not far from commercialization. Basically no one will apply.
Moreover, once an article is published, it is no longer possible to apply for a patent with the same content in my country, because anyone can retrieve the specific content, and the patent itself loses its novelty. "
"That's it." Han Jiaying nodded, seemingly enlightened.
After solving the puzzle for the school girl, Xu Qiu entered the spin-coating glove box, unloaded the gas pipe on the original spin-coating platform, and put the old spin-coating platform into the large transfer cabin.
At this time, the voice of "呲呲" came around.
"Have you heard any sound?" He reacted first and stopped the movement in his hands.
"It seems to be a leak?" Han Jiaying said uncertainly.
"It should be." Xu Qiu looked at the air pressure indicator on the side panel, and when there was no operation, it dropped by 0.1 bar every few seconds, which was obviously abnormal.
After thinking about it, he roughly guessed the reason, so he quickly tore open a bag of disposable latex gloves and wrapped one of the gloves around the end of the airway tube.
Sure enough, the leaking sound of "呲呲" disappeared.
"I understand, the gas valve is installed inside the glue spreader," Han Jiaying analyzed:
"When the brother removes the air pipe, the inside and outside of the glove box will be connected, and the pressure in the cabin is greater than one atmosphere, so air leakage will occur."
"Yes, so I plugged the gap with disposable gloves just now. It was a stopgap measure." Xu Qiu nodded.
Although he didn't do less experiments, it was the first time for him to set up experimental equipment in the glove box.
The next main task is to connect the mechanical pump and the spin-coating platform with a gas pipe.
Glove boxes have high requirements for air tightness. The gas paths like nitrogen guns and mechanical pumps are laid in advance, and the transfer interface installed on the side of the box is used, which is quite troublesome to disassemble.
The best case is not to move the original gas path in the glove box.
But the models of the two homogenizers are different, and the gas pipes are not necessarily compatible. You need to try to find out.
And this kind of gas pipe used for vacuum equipment is hard pipe, because if it is a hose, it will be crushed by atmospheric pressure under low vacuum.
It is still difficult to adjust the inner diameter of such a hard tube.
Either give it a huge external force to force the tube into the connection port, which tests the muscle strength of the hand, or heat it to soften the inner wall before connecting.
The latter requires the use of a dedicated heating wall-enlarging machine, which is not available in the laboratory, so the former can only be selected first and hardened with brute force.
After careful consideration, Xu Qiu picked up the end of the airway tube that had been removed before, and took off the disposable gloves on it, and the sound of the air flow reappeared.
He pointed the gas pipe at the copper interface on the spin-coating platform, and quickly pushed it.
Go in for a while, there is a play!
The sound of airflow also disappeared.
The hard tube covers approximately one-third of the length of the interface.
Not enough, in order to ensure that there will be no problems during the subsequent experiments, it is best to cover it completely.
"Brother, come on, work harder, didn't eat..." Han Jiaying'encouraged' beside her.
Xu Qiu glared at her, this guy is now joking.
However, the encouragement of the school girl still has some effect. After adding the BUFF, he worked hard for a few minutes, and finally pushed the hard tube into the deepest part of the interface.
Then he tied the gas pipe and the interface with a cable tie to prevent it from falling off.
Finally finished, Xu Qiu shook the slightly painful right hand and let out a long breath.
Although it was already winter in December, sweat still dripped from his cheeks and sank into the gray lab coat.
In the glove box, there is no way to wipe sweat, but he has long been used to it. If he experimented in the summer, it would only be more exaggerated than the current situation.
After a while, Xu Qiu began to look at the operation interface of the new spin coating platform.
It is more complicated than the original homogenizer.
Ordinary glue spreading machine only has two buttons for suction and start, and four gear-type digital setting areas for speed 1, time 1, speed 2, and time 2.
In addition to these basic functions, the heating-type homogenizer in front of you also adds a platform temperature digital display panel, a program temperature control function, and supports up to eight steps.
Each step is controlled by program, and the speed, time and temperature can be set separately.
But there is no cooling device on the instrument, that is to say, if the program setting is unreasonable, many steps are actually impossible to achieve.
For example, the first segment, 3000r.p.m., 100 degrees Celsius, lasts 10 seconds.
The second segment, 2000r.p.m., 30 degrees Celsius, lasts 30 seconds.
Obviously, after the first stage of 100 degrees Celsius is over, it is impossible to jump to 30 degrees Celsius in an instant.
It is difficult to even increase the temperature by 70 degrees Celsius for a short time, let alone reduce the temperature by 70 degrees Celsius.
In this way, the function of temperature changes is somewhat tasteless.
However, now there is no need to change the temperature and maintain a constant temperature to meet most experimental requirements.
After understanding how to use the instrument, Xu Qiu assigned Han Jiaying a task to let her turn on the mechanical pump outside.
The school girl nodded and agreed, and then said: "The mechanical pump they sent here seems to be useless."
"High probability," Xu Qiu added conservatively: "We still have to wait for the effect to be known before trying it."
Han Jiaying walked around to the side of the glove box and pressed the start button of the mechanical pump. A slight buzzing sound came.
"Brother, the pump has already started."
"Okay." Xu Qiu put a glass substrate on the spin-coating platform, then adjusted the parameters and started the test with 5000r.p.m. rotation speed.
The glass piece ~EbookFREE.me~ was firmly held by the suction table during the 30-second high-speed rotation, and it did not fly out.
It was tested again at 6000r.p.m. speed, and there was no accident.
"It has been 90% successful now." Xu Qiu said with satisfaction.
"What about 10%?" Han Jiaying tilted her head and asked, "Does it mean the heating function?"
"The heating function is not in a hurry. We have to finally confirm the air tightness." Xu Qiu said:
"Wait for you to stare at the rubber gloves in the glove box to see if there is any obvious air leak."
After that, he left the glove box, carrying the mechanical pump and the replaced spin-coating platform, and walked to door 216.
The spin-coating platform has been ravaged by various solutions, with colorful, yellow, brown, blue, black, and various colors on it.
Xu Qiu put them back into the box and began to consider their use. This one can be kept for later use, or this set can be thrown to Zhang Jiang later, because the Handan Laboratory does not lack a glue spreader.
After thinking about it for a while, he decided to drag the box back to the laboratory, find a corner to put it, and let it see the sky again when needed.
After that, Xu Qiu walked to the spin-coated glove box and asked the school girl: "How is it, is there anything abnormal?"
"There is no abnormality, it should be normal." Han Jiaying replied happily.
"Then the next task of exploring experimental conditions, I beg you, including my 5 systems and your 2 systems."
"Okay."
"Also, the light source on Saturday night, let's go together."
"Yeah, good." The school girl's smile gradually disappeared.
"By the way, light source samples will also be made. This time it is mainly your system. It is estimated that you will need 30-50."
"Oh."
Seeing Han Jiaying's bitter eyes, Xu Qiuguo slipped.