Best Emulsifier For Water In Oil Emulsion – In the past weeks we have had several discussions about HLB, W/O and O/W emulsions. There is some misleading information about emulsion types that is not always true, some of this information I have found is:
The viscosity of a W/O emulsion can be changed by increasing the viscosity of the water and milk phases.
Best Emulsifier For Water In Oil Emulsion
Basically, when we talk about W/O and O/W, the water component can be water or other hydrophilic liquids (such as hydrosols in modern natural cosmetics) and the oil component can contain any lipophilic substance (or a combination of many of them . ) such as oils, silicone oils, fatty esters or fatty acids.
What Is An Emulsion? The Secret To Sauces And Dressings
The most important factor in the formulation of W/O or O/W is the type of emulsifier or combination of emulsifiers. With any oil or fat mixture, you can create two emulsions, one W/O and one O/W by choosing different emulsifier combinations. For W/O emulsions you need emulsifiers with low HLB (4-6) and for O/W emulsion you need emulsifiers with high HLB (8-16). This is the basis of the emulsion type. If you add water to the oil phase or vice versa, if you use high shear or not, it all depends on your emulsifying system and other ingredients. Some emulsifiers are shear and require low shear, others are high shear. This is information that your dealer must provide, or you will arrive at it by trial and error (or more error than trial).
Another myth about W/O and O/W emulsions is the ratio of oil to water. Basically, in all types of emulsion you have a water content between 60-80%. Sometimes in some special systems you can prepare emulsions with a high oil content, but most emulsions fall in the water fraction of 60-80%. O/W emulsions feel lighter on the skin because the water component is the outer layer, but W/O emulsions provide better protection. This is very important for large and dry skin, winter care and energy conservation. Because W/O emulsions do not wash off as easily as O/W emulsions and some are completely waterproof, many sunscreens and lotions are formulated as W/O. These are similar to foam products that should provide a good oil film over the baby’s skin area.
Let’s get to biosecurity. In W/O products, the water phase is contained (almost hidden) within the continuous oil phase. This is why the W/O emulsion is easy to maintain and less messy.
W/O emulsions require an electrolyte to stabilize the volume of water droplets in the oil phase. This is done by adding Sodium Chloride, Magnesium Chloride, Magnesium Sulphate or other electrolytes to the system. On the other hand, the mass of O/W emulsion is reduced by adding electrolyte.
What Is The Effect Of Mfc On Emulsion Stability
Since the outer layer in an O/W emulsion is water, you can check the difference between a W/O and an O/W emulsion by measuring the emulsion voltage. W/O emulsions do not show performance.
You can control the viscosity of any emulsion (and thus the stability of the emulsion) by controlling the viscosity of the outer layer. This is known to you and you have tried to increase the viscosity of your emulsion by using xanthan gum, konjak mannan, cmc, tylose, carrageenan or other natural gums and synthetic polymers. This only applies to O/W emulsions where the outer phase is water. For W/O emulsions, the addition of gum does not affect the viscosity or stability of the emulsion. However, it can improve the dispersion and skin feel of the emulsion. For these emulsions you need to increase the viscosity of the oil part. Here you can put natural and synthetic waxes and other polymers that increase the viscosity of the oil.
These are some common characteristics of W/O and O/W emulsions. How to find useful infographic for quick reference. In fact, knowing the Hydrophilic-Lipophilic Balance (HLB) of your chosen emulsifier will help you determine if you have a water-in-oil (W/O) or oil-in-water (O/W) emulsion. I’m here to tell you that science is unfortunately not always easy.
Depending on the emulsifier you choose, it is possible that you will come to unexpected results and that your cosmetic emulsion is not what you think.
Pdf) Effect Of Oil Content And Emulsifier Type On The Properties And Antioxidant Activity Of Sea Buckthorn Oil In Water Emulsions
A hydrophobic emulsifier with a low HLB (suitable for W/O emulsions) can absorb water molecules and become hydrophilic, forming an O/W emulsion in the end – this is often the case with lecithin derivatives, for example.
If sometimes due to temperature changes that occur during the emulsification process, a “phase inversion” can occur and change the emulsifier from W/O to O/W or vice versa. This can happen at a temperature called PIT (phase transition temperature) which is unique to each emulsifier and its composition.
I will not bother you with the theory and properties of the component of enhancers and emulsifiers. You want to know what, if there is any doubt, the nature of your emulsion: W/O or O/W?
There is a simple and useful test that can reveal the nature of the cosmetic emulsion in a few seconds. Of course, there are also difficult and practical tests (such as measuring the diffusion conductivity), but these should not tell you the quality of your emulsion.
Oil In Water Emulsions
In the following picture, we have prepared a 30% dispersion of W/O and O/W emulsions in water. Emulsion #80 is, as you may have guessed a W/O emulsion and emulsion #327 is an O/W one.
In this second image, we have stimulated the spread of the glass rod. As you can see, O/W emulsion mixes and spreads in water, while W/O repels water and does not mix with water.
In this last picture, after developing the mixture, the O/W emulsion turns pink, which means that the color is mixed with the emulsion, while the W/O emulsion remains pure in the surrounding pink solution.
You can even apply color directly to the lotion to give it a different look. In these pictures I have applied turmeric powder (oil soluble) and food coloring (water soluble) directly to the W/O and O/W lotion. Instead of drinking water, you can add beetroot powder or other soluble water.
Emulsion: Definition, Explanation, Types, Examples Of Emulsions
As you can see, the yellow spreads first on the W/O lotion (wets from above), which stays on top of the O/W lotion. However, this propagation takes a long time and is slow.
Dispersion of paint in water is fast. Add a single drop or small amount of powder and you can easily distinguish W/O from O/W emulsion.
By following these simple steps, you will find that you can run a simple test in a few minutes to determine the condition of your cosmetic emulsion. What? Want to learn how to make an emulsion? Register for one of our courses.
Dr. Elham Eghbali was a Cosmetic Chemist for Formula Botanica between 2014 and 2018. He has over 20 years of industry experience and is based in Bavaria, Germany. To read more about the Formula Botanica team, visit our staff page.
W/o Vs. O/w Emulsions
We would love to receive your emails. We try to answer all messages within 2 business days, but usually sooner!
Maintaining the water content of these drinks is important. In general, the percentage of water should remain between 35 and 45 percent, as this water begins to lose fire resistance at less than 35 percent water. If the water content increases above 45 percent, the anti-wear effect of water is reduced. Therefore, it is very important that the water content in the emulsion is checked regularly (daily). If possible, use distilled or deionized water to avoid introducing impurities that can cause emulsion problems.
The temperature of the operating system should not exceed 50 degrees C (122 degrees F) to reduce the possibility of water leakage. Heat exchangers may be required in some applications. Freezing temperatures can cause the emulsion to break.
Emulsifiers For Household Margarines
In general, most invertemulsions are compatible with common hydraulic seal materials and contain anti-wear additives and corrosion and corrosion inhibitors.
Breathing and breathing may be more problematic with water-in-oil emulsions than with petroleum. For this reason, large ducts with adequate ventilation and baffles may be required. The discharge of the return line should be as far as possible from the pump, and the returned water should be discharged below.