if you are feeling bothered about it please don't watch my video. I truly could not care less. Also it's "can't" not "cant" so unless you can write proper english you should not bother about others spoken english which is quite good in my case.
I personally don't mind the heavy accent and I can understand what he's saying quite well. At least he's speaking in English. Just enjoy the content or not. Don't whine about it.
Hydrophilic fumed silica must be plain SiO2, Si(OH)4, Si(=O)(OH)2 and 3D polymers. Silica has a low solubility into water that increases with pH and with heat... that's the way to grow very large quartz crystals from sand/quartz/silicic acid in large pressurized and heated hydrothermal reactors with a few °C gradient from bottom vs top. The hot heated zone dissolves silica and the "cold" zone holds a few seeding crystals onto what the dissolved silica precipitates/crystallizes and grows...then the fluid loses a few % of dissolved silica and migrates where the feedstock of unpure or raw silica crystals for heating and reconcentration. After monthes of thermostatization you can get pretty large facetted and clear crystals of optical purity. By adding some metallic cations impurities, you may obtain nice colored crystals... green, blue, ... Hydrophilic fumed silica can be used as a chromatography filling static phase... it has strong affinity for hydrophilic / polar or charged molecules and thus display long retention times... hydrophobic molecules have short retention times and passes fast and grouped for example with cyclo-hexane and the separation increases with elution time and volume... then the polarity of the eluting solvent can be increased by slow increments/gradient of polarity (for example some aceton or n-butanol) and displace the more hydrophilic molecules... at a point you get 100% butanol and you may then add ethanol or methanol to kick the strongly polar molecules out of the column. Hydrophobic fumed silica is often called IIRC reverse phase chromatography... the hydroxyl groups onto the silica fine powder are reacted with bulky/hydrophobic alkyl or aryl groups holding reactive acyl/aryl sulfonic acid chloride or chloride that hide the hydrophilic OH of the silica and change the surfacial properties of the silica (as ether, esters,... triflates, tosylates, ...) the polar end is sticked innerside and only leave the large hydrophobic part accessible to the flowing solvent fluid outside. Now polar molecules passes faster and hydrophibic ones are retained longer. You start with methanol/aceton/water and you decrease bit by bit the polarity until 100% hydrophobic solvent... That's how we used to isolate large chromatographic fractions of molecules out of various exotic plants in the search of new anti cancerous drugs I hope this helps. PHZ (PHILOU Zrealone from the Science Madness forum)
@@bromisovalum8417 For even larger systems there is the chromatotron... made out of a solid disc like cement/plaster/chalk/lime and silica gel, fumed silica... when dried, the disc is set at 30-60° vs horizontal or vertical planes and can be made to rotate... the centrifugal force drives the solvent from the center (where it falls dropwise) to the edge... the center has a cylindrical space made out of the same material to put the starting sample included into the matrix (or added as a concentrated solution) into the center. On the side of the disc there is a curved collector... the eluant is ejected into the surrounding collector... the force is stronger arround the lowest point of the disc due to additional gravity and the fluid collects there... then into a funnel and pipe for analysis (electric conductivity or refractive index... and sub fractions recollections.
Ok I´m honest but the dry water thing somewhat failed and I need to dry again. This was what I was aiming for and I hope you still enjoied todays video. ua-cam.com/video/lbNF8k-gFeY/v-deo.html
I guess we need to see the difference under a microscope.. surely it's the physical shape that is the difference... Not sure if it was said, I didn't hear it.
fantastic for chromatography, and for some reason, incredibly expensive! However, alumina can't even compare to silica for its performance properties. Never have seen better separation!
I know a Dutch supplier that sells a 500g (10L) bucket of Aerosil "collodial silica" for 20€. From a synthetic resins supply house that sells to the general public.
I tried Your idea on a microscope slide. Made a thin water gel with a little ammonia to make it wet better. No trouble getting a fairly even layer by dipping. But as predicted it first dried nicely and then developed micro cracks. What is tempting about this is the enormous surface area of the fumed silica perhaps making tlc possible att even smaller scales. Perhaps different solvents or some binder that does not interfere to much, surface treatment or sand blasting the glass, differnt base material or something similar could solve the problem.
Hydrophilic fumed silica is also available as food grade. Still a silicosis risk with all fine SiO2 for the lungs though. We used it in the past for experimental medical formulations for the dental industry as a thickener. And for thickening marine epoxy for my projects. Anti caking agent for fine powders. It is a very useful material for a variety of purposes. The idea to make TLC plates below is very interesting , perhaps very useful separation properties. I suspect it will tend to crack badly on drying when the gel shrinks on a plate though.
@@tommihommi1 That is interesting. I checked, still have a bottle of water thin nano silica Bindzil 150cc from 2010, still perfectly OK bur 6 montths storage life on the bottle...perhaps good for tea. I can however imagine that small enough SiO2 nano particles would not be good if getting into cells etc. Was developed by EKA in Sweden, very useful in paints and inks among other things. I knew the guy at EKA doing functionalizations on this at the time.
@@tommihommi1 I allways believed that solubility in neutral media was essentially 0 for all practical purposes and that nano emulsions are what "disolves" silica. I did a quick search, found no number for solubility in pure water. It is quite soluble at 350C and high pressures and in strong alkali though. One funny thing is that some serious studies show that silica in drinking water seems to reduce risk for dementia somewhat... perhaps that tea is good for scientists.
Great video. Out of interest what percentage would you add of fumed silica to make a gel. I used 5% by weight of fumed silica but very watery. Do you think 10% or did you add much more?
If you cant speak clearly in english, please speak in your own language..
if you are feeling bothered about it please don't watch my video. I truly could not care less. Also it's "can't" not "cant" so unless you can write proper english you should not bother about others spoken english which is quite good in my case.
I personally don't mind the heavy accent and I can understand what he's saying quite well. At least he's speaking in English. Just enjoy the content or not. Don't whine about it.
nobody cares about what you want
He speaks English well. It's only natural for foreigners to have accents. You're projecting your own insecurities.
Señor Fernandes tu nombre suena bastante latino, que te haces el inglés?
Hydrophilic fumed silica must be plain SiO2, Si(OH)4, Si(=O)(OH)2 and 3D polymers.
Silica has a low solubility into water that increases with pH and with heat... that's the way to grow very large quartz crystals from sand/quartz/silicic acid in large pressurized and heated hydrothermal reactors with a few °C gradient from bottom vs top.
The hot heated zone dissolves silica and the "cold" zone holds a few seeding crystals onto what the dissolved silica precipitates/crystallizes and grows...then the fluid loses a few % of dissolved silica and migrates where the feedstock of unpure or raw silica crystals for heating and reconcentration.
After monthes of thermostatization you can get pretty large facetted and clear crystals of optical purity.
By adding some metallic cations impurities, you may obtain nice colored crystals... green, blue, ...
Hydrophilic fumed silica can be used as a chromatography filling static phase... it has strong affinity for hydrophilic / polar or charged molecules and thus display long retention times... hydrophobic molecules have short retention times and passes fast and grouped for example with cyclo-hexane and the separation increases with elution time and volume... then the polarity of the eluting solvent can be increased by slow increments/gradient of polarity (for example some aceton or n-butanol) and displace the more hydrophilic molecules... at a point you get 100% butanol and you may then add ethanol or methanol to kick the strongly polar molecules out of the column.
Hydrophobic fumed silica is often called IIRC reverse phase chromatography... the hydroxyl groups onto the silica fine powder are reacted with bulky/hydrophobic alkyl or aryl groups holding reactive acyl/aryl sulfonic acid chloride or chloride that hide the hydrophilic OH of the silica and change the surfacial properties of the silica (as ether, esters,... triflates, tosylates, ...) the polar end is sticked innerside and only leave the large hydrophobic part accessible to the flowing solvent fluid outside.
Now polar molecules passes faster and hydrophibic ones are retained longer. You start with methanol/aceton/water and you decrease bit by bit the polarity until 100% hydrophobic solvent...
That's how we used to isolate large chromatographic fractions of molecules out of various exotic plants in the search of new anti cancerous drugs
I hope this helps.
PHZ
(PHILOU Zrealone from the Science Madness forum)
Philou Z! greetings from a fellow countryman!
It would be great so see some practical experiments with classic column or flash chromatography. The latter can be done using a big syringe.
@@bromisovalum8417
For even larger systems there is the chromatotron... made out of a solid disc like cement/plaster/chalk/lime and silica gel, fumed silica... when dried, the disc is set at 30-60° vs horizontal or vertical planes and can be made to rotate... the centrifugal force drives the solvent from the center (where it falls dropwise) to the edge... the center has a cylindrical space made out of the same material to put the starting sample included into the matrix (or added as a concentrated solution) into the center. On the side of the disc there is a curved collector... the eluant is ejected into the surrounding collector... the force is stronger arround the lowest point of the disc due to additional gravity and the fluid collects there... then into a funnel and pipe for analysis (electric conductivity or refractive index... and sub fractions recollections.
Ok I´m honest but the dry water thing somewhat failed and I need to dry again. This was what I was aiming for and I hope you still enjoied todays video.
ua-cam.com/video/lbNF8k-gFeY/v-deo.html
I guess we need to see the difference under a microscope.. surely it's the physical shape that is the difference... Not sure if it was said, I didn't hear it.
Can you add hydrophobic and hydophilic silica to peg
Fumed silica is not hazardous. Crystalline silica is the one that causes silicosis.
No no
Fantastic video as always!
fantastic for chromatography, and for some reason, incredibly expensive! However, alumina can't even compare to silica for its performance properties. Never have seen better separation!
I know a Dutch supplier that sells a 500g (10L) bucket of Aerosil "collodial silica" for 20€. From a synthetic resins supply house that sells to the general public.
Do you think making TLC plates is possible with a slurry made from hydrophilic fumed silica ?
Maybe. Might give it a try someday but don’t expect these plates to be great.
I tried Your idea on a microscope slide. Made a thin water gel with a little ammonia to make it wet better. No trouble getting a fairly even layer by dipping. But as predicted it first dried nicely and then developed micro cracks. What is tempting about this is the enormous surface area of the fumed silica perhaps making tlc possible att even smaller scales. Perhaps different solvents or some binder that does not interfere to much, surface treatment or sand blasting the glass, differnt base material or something similar could solve the problem.
Hydrophilic fumed silica is also available as food grade. Still a silicosis risk with all fine SiO2 for the lungs though. We used it in the past for experimental medical formulations for the dental industry as a thickener. And for thickening marine epoxy for my projects. Anti caking agent for fine powders. It is a very useful material for a variety of purposes. The idea to make TLC plates below is very interesting , perhaps very useful separation properties. I suspect it will tend to crack badly on drying when the gel shrinks on a plate though.
Tea heads use it in small amounts as part of the mineral composition for their tea water.
@@tommihommi1 That is interesting. I checked, still have a bottle of water thin nano silica Bindzil 150cc from 2010, still perfectly OK bur 6 montths storage life on the bottle...perhaps good for tea. I can however imagine that small enough SiO2 nano particles would not be good if getting into cells etc. Was developed by EKA in Sweden, very useful in paints and inks among other things. I knew the guy at EKA doing functionalizations on this at the time.
@@erikisberg3886 you use a small enough amount that it actually dissovles
@@tommihommi1 I allways believed that solubility in neutral media was essentially 0 for all practical purposes and that nano emulsions are what "disolves" silica. I did a quick search, found no number for solubility in pure water. It is quite soluble at 350C and high pressures and in strong alkali though. One funny thing is that some serious studies show that silica in drinking water seems to reduce risk for dementia somewhat... perhaps that tea is good for scientists.
@@erikisberg3886 interesting, fuji water has about 90mg/l of the stuff, guess it's a nano emulsion then?
I used to have a similar bucket of Aerosil around. Curious how little it weighs. It's a great filtering agent.
Great video.
Out of interest what percentage would you add of fumed silica to make a gel.
I used 5% by weight of fumed silica but very watery. Do you think 10% or did you add much more?
I don´t know. The most helpful answer I can give you is to just try it. Gradually add more water until you are satisfied.
Thank you
Don't know what kind I got off ebay but i mixed it with linseed, walnut, and safflower and made different gel oil paint mediums.
@THYZOID LABORATORIES you robbed Evonik? )))
yeah yeah the old trick with the "look at me I can lift it with one hand"; that doesnt mean its light; you just buff my boy.
wonder how cymatics would look with this stuff.
You should make some experiments with NOVEC 1230 aka dry water.
Interesting looking stuff but I can't seem find a valid reason to buy any. Why do you have so much of it, do you use is as a dessicant?
Got it for free
Water lover Sodium silicate Crystal cat litter preparation Can you please me with the ingredients? Thank you
Not need to credit "The Action Lab" since he doesn't credit anyone, even when most of his content is copied from others work.
Dear fried
I Want to make grease so from which silka (hydrophilic silka or hydrophobic silka)
Can you please me with the ingredients of the crystal cat litter, the materials and the estimated amount of sodium silicate at home?
you need sodium silicate and an acid
🤤 You know I do be loving my silica
Cool
👌
Water lover Sodium silicate Crystal cat litter preparation Can you please me with the ingredients? Thank you