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Tagged: cetyl alcohol, emulsion, gms, lamellar-gel-network, lgn
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Some questions about (LGN) lamellar gel network
Posted by Abdullah on April 11, 2022 at 1:37 pm1. These emulsifier combinations create lamellar gel network in emulsion.
25% SSL+ 75%(GMS+cetyl alcohol)
25% SPDMA+75%(GMS+cetyl alcohol)Am i correct in this?2. If we use glyceryl oleate instead of GMS, will it still make lamellar gel network?
3. If we remove cetyl alcohol and only use 25% SSL+ 75%GMS or 25%SPDMA+ 75%GMS, will it make lamellar gel network?
4. If we remove GMS and only use 25% SSL+ 75% cetyl alcohol or 25% SPDMA+ 75% cetyl alcohol, will it make lamellar gel network?
ketchito replied 2 years, 4 months ago 6 Members · 15 Replies -
15 Replies
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@Abdullah the GMO does not like to support LLC formation like GMS does, so negative on that. The GMS alone may support with certain emulsifier combinations, but not a singular one like you describe. I’ve always used this ratio for LLC network formation: cetyl alcohol : glyceryl stearate @ 3:1. Seems to work even with those #%$@!! glycosides. The other “hack” with LLC is slow mixing while slow cooling. Too much shear at too steep a thermocline and you end up with soup.
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@chemicalmatt thanks
1. What other emulsifier was combined with cetyl alcohol : glyceryl stearate @ 3:1 and what quantity? Or it is just these two?
2. By too much shear, do you mean duration of homogenization or speed of homogenizer?
I have inline homogenizer with 2800rpm speed.2. By slow mixing, do you mean mixing after the emulsion is formed?
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i use this for in tank mixing.
Adjustable speed 300-850rpm 1kw.Is this slow enough mixer?
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chemicalmatt said:@Abdullah the GMO does not like to support LLC formation like GMS does, so negative on that. The GMS alone may support with certain emulsifier combinations, but not a singular one like you describe. I’ve always used this ratio for LLC network formation: cetyl alcohol : glyceryl stearate @ 3:1. Seems to work even with those #%$@!! glycosides. The other “hack” with LLC is slow mixing while slow cooling. Too much shear at too steep a thermocline and you end up with soup.
I was under the impression…the lamellar emulsion could take some shear while it was very hot (just combined), but then to remove shear after a minute or two….and stir down to room temp, with no enhanced cooling? Would you agree? @chemicalmatt
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@Abdullah, you need also high HLB surfactant, check this article: https://knowledge.ulprospector.com/4712/pcc-lamellar-gel-network-technology-a-primer/
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Just some lecture from Dr. Ricardo Diez, that might change the way you look at lamellar gel networks :
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grapefruit22 said:@Abdullah, you need also high HLB surfactant, check this article: https://knowledge.ulprospector.com/4712/pcc-lamellar-gel-network-technology-a-primer/
I have SSL and SPDMA as high hlb surfactants
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ketchito said:@Abdullah Most structured cosmetic emulsions now have a lamellar gel network. Unfortunately (because not everyone has access to the equipment) the only way to really know if you got one is through x-ray diffraction.
@ketchito by equipments, do you mean equipments to make LGN or equipments to check if it is made?
If you mean equipments to make LGN, what are those equipments? -
@chemicalmatt just to know, the molar ratio for high/low HLB surfactant should be between 1:1-1:6 to make LGN. How do you count the molecular weight of GMS when glyceryl mono stearate is 40% or 90% in GMS product?
For example
GMS is 358.563 g/mol
GDS is 625.02 g/molGMS that we use is not 100% GMS. It has glyceryl distearate too.
If you use 1% GMS product that has 40% GMS in it, will you consider molecular weight of this 1% GMS for LGN
As 358.563 g/molAs 500.512 g/mol which is sum of 40% mono & 60% di stearate
Or as 143.4252 g/mol which you count only 40% mono part and don’t count distearate at all? -
ketchito said:
@Abdullah Most structured cosmetic emulsions now have a lamellar gel network. Unfortunately (because not everyone has access to the equipment) the only way to really know if you got one is through x-ray diffraction.@ketchito, what would be the equipment? Is it homogeniser and some low shear overhead mixer?
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Paprik said:ketchito said:@Abdullah Most structured cosmetic emulsions now have a lamellar gel network. Unfortunately (because not everyone has access to the equipment) the only way to really know if you got one is through x-ray diffraction.
@ketchito, what would be the equipment? Is it homogeniser and some low shear overhead mixer?
For properly checking if you actually made a LGN, you’d need to analyze it with an X-ray diffractometer (there might be other indirect ways, but this is the gold standard, at least for academics)
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