I am an undergraduate who is trying to synthesize mesoporous particles by mixing several compounds.
Something is wrong with the experiment, I need advice.
Briefly, there is a problem in changing the composition of the dispersed phase in the emulsion.
I use a total of five compounds, A, B, C, D and surfactant(Pluronic).
A mixture of A and B is a dispersed phase(oil), and C, D and a surfactant are continuous phases(water).
Only A and C participate in the reaction, D is the catalyst, and B affects the morphology of the particles.
Prior to the experiment, the adviser was given the molar ratio of the reactants.(A : B : suf : C : D = 1 : x : y : z : w)
I dripped the dispersed phase in the continuous phase of stirring.
At this molar ratio, the reaction took place very well.
I now have to change the mole ratio of A and B in the dispersed phase.
For example, I need to change A : B from 1 : x to 1 : 2x etc.
(I thought I could just change it to 1 : x : y : z : w → 1 : 2x : y : z : w etc.)
My advisor said you shouldn't just stretch B into simple arithmetic.
He also advised me to find out about Spreading Coefficient.
What is the relationship between the spreading coefficient and the composition of the dispersed phase?
What is the relationship between the spreading coefficient and the amount of dispersed phase?
since the reaction for initial concentration took well, try changing the quantity of surfactant also along with B...
Dear Sang-Ho,
I have difficulties to figure out what is actually meant, so first here what I assume to be the case.
Continuous phase is water containing reactant C, catalyst D and a surfactant. For reaction you add a mixture of 2 oils (one reacts the other is inert) dropwise. If one assumes that compounds dissolved in water do not partition into the oil phase than changing composition of dispersed phase is only possible by changing the ratio of A to B. Important to consider whether A and B are fully miscible or only in limits.
Mebin Samuel , Titus Sobisch .
Thank you very much for your answers.
Talking more with my adviser, what he said about Spreading Coefficient was more about emulsion stabilization than about composition.
Despite the S.C. where emulsion cannot be stabilized, it was intended to think about why spherical particles came as a reaction product.
Of course I haven't found an answer yet, but thank you very much.
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