Hi! I am currently trying to do a similar research regarding the same method. I am using PLA and DCM. However, after casting and submerging it into water, we do not get the same result of the clear mixture turning opaque. Any thoughts or suggestions for this?
Hello. Can you give me detailed instructions on laminating the film so that the surface is even and thin like yours? I'm making it from PS and ABS plastic, but I'm having problems when the phase inversion of the film surface is not spread evenly and the cracking effect is not very good. Thank you
It seems some researchers did not use casting machine during their experiments. Is casting machine necessary for a research purpose as well or is a casting knife enough?
You can do research without a casting machine, but of course, your results will be more reliable if you control more parameters, relative humidity, air and water temperature, immersing speed, etc. Everything affects the properties of the membrane.
I am working with a similar membrane based on (aldehyde) functionalized pva, however I am facing the issue of insufficient pervaporation performance as after drying the membrane once, presumably because the nanopores are collapsing as well as the membrane being less hydrophilic than I would’ve liked. Can you imagine any workaround to that problem? I‘d like to avoid carboxylated cellulose as that may aid in biodegrading the membrane, additionally it should be able to dry out without loss in performance. Thanks very much
Pervaporation membranes are different to this type of membranes. My suggestions are probably the ones you might have thought about it: decrease the cross linking degree to have bigger pores, decrease thickness to have higher permeation and increase the temperature of operation to have higher diffusion. Your idea of increase the hydrophilicity is also good if you are trying to permeate water, and there are many polymers that you can use, not only carboxylated cellulose.
It is an automatic bar coater. I am not familiar with membranes for vanadium batteries, I work mainly in membranes for water treatment and desalination.
Hi sir. Can you recommend me any precautionary measure to maintain uniform thickness distribution by using tape and glass rod? I often face this problem where there are parts in my membrane has thickness around 125 micron and sometimes there was 150 micron for example.
The main problem when you do it by hand is to keep a constant speed on a large sample. The speed affects the thickness because a polymer solution is not-newtonian fluid and will respond to the deformation of the glass rod differently. If you can't control the speed do it very slowly or just make small samples.
Hey Mr. , at the moment im working with membranes, too. The problem is: i can't produce an even surface on my membran with the phase inversion. Do do you have any hints for parameter i could variate? Thank you in advance.
Yes, but it depends on the type of membrane you are making, and how you are making it. If you want, send me an email with more details of your problem.
@@anhdungnguyen7853anh ơi em đang làm luận văn về màng em cũng đang gặp vấn đền về lúc đảo pha màng không được đồng đều anh có thể chỉ em cách thức chỉ tiết việc cán màng được không ạ. Em cảm ơn ạ
hi, I'm trying to make a casting solution but with cellulose acetate and acetone, I would like to know how to make it gel-like and clear like this one you prepared. your really would be much appreciated.
Dear sir, I am trying to fabricate a similar membrane, can you please help me with the details of the casting machine used in your study? Is it readily available in Japan?
Good evening sir. I hope you are still active. I wanted to use this phase inversion with HDPE. DO you now of any suitable solvents I can use for that ?
It is, of course. What you remove depends on the feed composition. Typical pores size of these membranes is up to 10 nm. For smaller pore size you need a different membrane.
Salts is a very broad concept in chemistry. If you mean Sodium chloride, this is not a desalination membrane, but might be used as support to prepare one.
Hi, Can you please tell me the name of the casting knife? I'm working in Membrane and i'm using manual method and it doesn't give a good membrane film. Thanks.
Hai. I have been producing pvdf membrane. But I am unable to produce the membrane with even surface. Sometimes the membrane comes out perfect while the other time the membrane has a lot of wrinkles on its surface. I wonder if you have ever encounter this problem. Hope to hear from you soon.
I found 2 parameters critical to avoid wrinkling. The time between casting and water immersion and laboratory temperature and ventilation. Wrinkling on the membrane surface comes from surface drying before phase inversion.
Is different. Here, an immersion-precipitation process happens. The polymer solution becomes a solid membrane. Most of the solvent diffuses in the water.
Membranes are usually stored wet with a solution containing a small amount of biocide. After drying the membranes must be treated again with wetting agents before use.
In principle, you can use any polymer as long as it can be dissolved in a certain solvent and precipitated in another solvent that is miscible with the first one.
Hello Sir, thank you for this video. I need a little help. I am a membrane using this same method. Please can you help with the ratio of the polymer to the solvent. I am using methanol in my case. I will be glad if you can help.
Hello sir Can you help me for 1 nm water filter membrane how its made which material require for membrane sheet and which company support for make membrane paper makin machine for membrane manufacture
If weather also effects for production please give specifications. I tried too much for membrane paper but not reach to produce please help or link of chemical details web site
+rcruzsilvarcen i'm so nervous with my experiment Sir. I want to synthesis CA membrane for desalination. i make it from banana's peel. i use DMSO and DMP for additives and acetone for solvent. how do u think of it?
Hello Sir, thank you for your video. Sir i want your help for preparing membrane will you please help me in it? I tried to get information about ingredients process which may used for preparation of membrane, but i don't found it on Internet so please help me it
Hi! I am currently trying to do a similar research regarding the same method. I am using PLA and DCM. However, after casting and submerging it into water, we do not get the same result of the clear mixture turning opaque. Any thoughts or suggestions for this?
Hello. Can you give me detailed instructions on laminating the film so that the surface is even and thin like yours? I'm making it from PS and ABS plastic, but I'm having problems when the phase inversion of the film surface is not spread evenly and the cracking effect is not very good. Thank you
@@phuongtrinh3251 I will try. Which solvent and concentration are you using?
It's all about knife and machine quality... We can make it
@@rcruzsilvarcen i using NMP and DMF with PS.
It seems some researchers did not use casting machine during their experiments. Is casting machine necessary for a research purpose as well or is a casting knife enough?
You can do research without a casting machine, but of course, your results will be more reliable if you control more parameters, relative humidity, air and water temperature, immersing speed, etc. Everything affects the properties of the membrane.
I like your casting machine, is it possible to get the manufactures name because I haven't found that size in the USA. Thank you for your help
Just google "flat sheet membrane casting machine", there are many brands in USA, even bigger than this one.
Good.👌👍
I am working with a similar membrane based on (aldehyde) functionalized pva, however I am facing the issue of insufficient pervaporation performance as after drying the membrane once, presumably because the nanopores are collapsing as well as the membrane being less hydrophilic than I would’ve liked. Can you imagine any workaround to that problem? I‘d like to avoid carboxylated cellulose as that may aid in biodegrading the membrane, additionally it should be able to dry out without loss in performance.
Thanks very much
Pervaporation membranes are different to this type of membranes. My suggestions are probably the ones you might have thought about it: decrease the cross linking degree to have bigger pores, decrease thickness to have higher permeation and increase the temperature of operation to have higher diffusion. Your idea of increase the hydrophilicity is also good if you are trying to permeate water, and there are many polymers that you can use, not only carboxylated cellulose.
Hello, What type of ionic membrane would be needed for a vanadium battery and what machine are you using in the video. Thanks
It is an automatic bar coater. I am not familiar with membranes for vanadium batteries, I work mainly in membranes for water treatment and desalination.
Hi sir. Can you recommend me any precautionary measure to maintain uniform thickness distribution by using tape and glass rod? I often face this problem where there are parts in my membrane has thickness around 125 micron and sometimes there was 150 micron for example.
The main problem when you do it by hand is to keep a constant speed on a large sample. The speed affects the thickness because a polymer solution is not-newtonian fluid and will respond to the deformation of the glass rod differently. If you can't control the speed do it very slowly or just make small samples.
ua-cam.com/video/TcscP8Dj_4o/v-deo.html
ua-cam.com/video/TcscP8Dj_4o/v-deo.html
Hey Mr. ,
at the moment im working with membranes, too. The problem is: i can't produce an even surface on my membran with the phase inversion. Do do you have any hints for parameter i could variate? Thank you in advance.
Yes, but it depends on the type of membrane you are making, and how you are making it. If you want, send me an email with more details of your problem.
@@rcruzsilvarcen Thank you for your fast reply. That would be awesome! Where can i find your mail adress? Thank you in advance.
@@rcruzsilvarcen i just found your email adress. i will sent you an email. thank you in advance.
ua-cam.com/video/TcscP8Dj_4o/v-deo.html
@@anhdungnguyen7853anh ơi em đang làm luận văn về màng em cũng đang gặp vấn đền về lúc đảo pha màng không được đồng đều anh có thể chỉ em cách thức chỉ tiết việc cán màng được không ạ. Em cảm ơn ạ
Hello Sir, how to prevent contamination while casting or during immerse in coagulation bath? Because my prisrine membrane had contaminated
A laboratory for membrane preparation must be free of dust and with controlled temperature and humidity. The bath must contain ultrapure water.
please make a video on how to make nafion membrane
hi, I'm trying to make a casting solution but with cellulose acetate and acetone, I would like to know how to make it gel-like and clear like this one you prepared. your really would be much appreciated.
The easiest way is to follow recipes available in articles in scientific journals.
Nelson brother I need your help in making membrane with cellulose acetate
Dear sir, I am trying to fabricate a similar membrane, can you please help me with the details of the casting machine used in your study? Is it readily available in Japan?
I have no idea, but any casting machine will work. You can do it even manually but the membrane is less reproducible.
Good evening sir. I hope you are still active. I wanted to use this phase inversion with HDPE. DO you now of any suitable solvents I can use for that ?
Still active. HDPE has no good solvent at room temperature.
Hi, was there any formation of wrinkles on the surface after the phase inversion?
No. Completely flat. If you are getting wrinkles probably you waited too much before immersing it in water and the surface dried.
i hope you are still active. How is this difference from NIPS?
No difference. NIPS = Non-solvent Induced Phase Separation Process.
@@rcruzsilvarcen alrighty, thaanks for replying!
Hi Sir, I want to install the same set-up in my lab. May I know from where I can purchase that?
I am sorry, I do not sell them and I do not know where is your lab. But there are many brands in the market.
Could you write a precise description of the materials you're using and how much of each? thank you in advance
Depends on what kind of membrane you want to obtain. Check the internet, there are hundreds of recipes.
Sir, the membrane which you are making in video is capable to use for waste water treatment and through this membrane what are we removing??
It is, of course. What you remove depends on the feed composition. Typical pores size of these membranes is up to 10 nm. For smaller pore size you need a different membrane.
sir , it is able to remove the dissolved salts present in water
Salts is a very broad concept in chemistry. If you mean Sodium chloride, this is not a desalination membrane, but might be used as support to prepare one.
Hi, Can you please tell me the name of the casting knife? I'm working in Membrane and i'm using manual method and it doesn't give a good membrane film. Thanks.
There are many brands, find one available in your country. This is a Japanese brand, a friend tried to buy it in USA and was not possible.
This knife is easy to make... We can make it..
Hai. I have been producing pvdf membrane. But I am unable to produce the membrane with even surface. Sometimes the membrane comes out perfect while the other time the membrane has a lot of wrinkles on its surface. I wonder if you have ever encounter this problem. Hope to hear from you soon.
I found 2 parameters critical to avoid wrinkling. The time between casting and water immersion and laboratory temperature and ventilation. Wrinkling on the membrane surface comes from surface drying before phase inversion.
@@rcruzsilvarcen Thank you sir for your reply. 😀
Sir, is it possible to caste the polysulfone membrane by mixing with some metal oxide nano composites?
Yes, just google it, some people already made membranes with polysulfone mixed with alumina, zirconia, silica, etc...
Sanju can you please give me your Whatsapp number please I want to make a membrane at my FYP
Hi，rcruzsilvarcen. I'm confused why it is called phase inversion, Is it same to the phase inversion in emulsion?
Is different. Here, an immersion-precipitation process happens. The polymer solution becomes a solid membrane. Most of the solvent diffuses in the water.
Hello sir, how do dry the membrane after the water bath? Does it shrink at all?
Thank you
Membranes are usually stored wet with a solution containing a small amount of biocide. After drying the membranes must be treated again with wetting agents before use.
Is it possible to use phase inversion for a nafion solution membrane?
In principle, you can use any polymer as long as it can be dissolved in a certain solvent and precipitated in another solvent that is miscible with the first one.
ua-cam.com/video/TcscP8Dj_4o/v-deo.html
Hello Sir, thank you for this video. I need a little help. I am a membrane using this same method. Please can you help with the ratio of the polymer to the solvent. I am using methanol in my case. I will be glad if you can help.
I don't know what polymer you are using. I use High Mw PSu at 20 % wt in DMF. Each polymer has its own optimal conditions.
@@rcruzsilvarcen I am using Zeolitic Imidazolate Framework (ZIF-8) can you help how many grams can be dissolved in how much volume of methanol?
Where to get this machine india...
I don't know
Hello sir
Can you help me for 1 nm water filter membrane how its made which material require for membrane sheet and which company support for make membrane paper makin machine for membrane manufacture
If weather also effects for production please give specifications. I tried too much for membrane paper but not reach to produce please help or link of chemical details web site
@@alokpatel2181 I think, so far, these membranes can only found in theoretical papers. Find them in google scholar.
can you please provide me the name, the supplier and the estimated price of this casting machine ? thank you in advance
This is an automatic bar coater. There are many brands, and price can vary a lot. Is better if you find the best one for you, perhaps a local company.
Sir, what is the cost of this casting machine.....can you please share the specification
Price should vary according to tax and shipments. Please contact a sales agent.
hai. i have one question. how can i do to my membrane if i don't have the cutting machine like this? *i'm sorry my english is bad
nurul fauziah nadwi you can do it by hand, using a glass rod and scotch tape as spacer.
+rcruzsilvarcen is it can thin like yours? i mean is it can be clean from "bubble"? *oh sorry for my english🙏
nurul fauziah nadwi yes, is very easy. Just do the experiment.
+rcruzsilvarcen i'm so nervous with my experiment Sir. I want to synthesis CA membrane for desalination. i make it from banana's peel. i use DMSO and DMP for additives and acetone for solvent. how do u think of it?
nurul fauziah nadwi sounds good! Now make it...
Hello Sir, thank you for your video. Sir i want your help for preparing membrane will you please help me in it?
I tried to get information about ingredients process which may used for preparation of membrane, but i don't found it on Internet so please help me it
The simplest is 15 wt% PSU solution in DMF.
@@rcruzsilvarcen sir will you please share long forms of these ingredients because i don't have any idea about these ingredients?
@@abhijeetdeshmukh4034 polysulfone and dimethylformamide
What is the use of this experiment in real life?? or What is the purpose of this experiment?
The purpose is the title of the video.
سلام