emulsion droplet size- coexistance of nano- and micro- droplets
emulsion droplet size- coexistance of nano- and micro- droplets
(OP)
Dear All
I've encounter a problem with emulsification of an oil-in-oil emulsion. I've intended to emulsify the system to generate ca.10um droplets. but result shows that lots of 200nm droplet co-exist with 10um droplets.
Could anyone give a thought how to avoid this problem?
Thank you for your time and concern!
details:
I've been working on a DMF/Cyclohexane (4%v/v)emulsion stablized by (0.3%v/v)Span85. Inside DMF phase, PEI(polyethylenimine) is dissolved which will later be crosslinked by 2,4-TDI(toluene diisocyanate) added to the emulsion. After that, the micro-capsule will form by interfacial polyaddition reaction.
SEM is applied to evaluate the size of microcapsule and a lot of 200nm particles are observed along with 10um capsules. I believe that indicate the co-existance of nano-droplets with the 10um droplets in the emulsion. I've no idea how to avoid this problem.
attached is a SEM picture of the phenomena described above
I've encounter a problem with emulsification of an oil-in-oil emulsion. I've intended to emulsify the system to generate ca.10um droplets. but result shows that lots of 200nm droplet co-exist with 10um droplets.
Could anyone give a thought how to avoid this problem?
Thank you for your time and concern!
details:
I've been working on a DMF/Cyclohexane (4%v/v)emulsion stablized by (0.3%v/v)Span85. Inside DMF phase, PEI(polyethylenimine) is dissolved which will later be crosslinked by 2,4-TDI(toluene diisocyanate) added to the emulsion. After that, the micro-capsule will form by interfacial polyaddition reaction.
SEM is applied to evaluate the size of microcapsule and a lot of 200nm particles are observed along with 10um capsules. I believe that indicate the co-existance of nano-droplets with the 10um droplets in the emulsion. I've no idea how to avoid this problem.
attached is a SEM picture of the phenomena described above





RE: emulsion droplet size- coexistance of nano- and micro- droplets
Small details, such as how you introduce one phase into the other can be very important.
RE: emulsion droplet size- coexistance of nano- and micro- droplets
I admit that it's no easy a job to get good control over droplet size via normal mixing methods, can I have some suggestions of books on this topic if there's any? Many thanks.
RE: emulsion droplet size- coexistance of nano- and micro- droplets