Method for Measuring the Volume of Nominally 100 um Diameter Spherical Water-in-Oil Emulsion Droplets
John A. Dagata, Natalia Farkas, John A. Kramar
This report describes an equivalent volume measurement method using optical microscopy for estimating the mean volume of nominally 100 um diameter spherical droplets. The droplets are the aqueous phase of proprietary water in oil emulsions used in a commercial droplet digital polymerase chain reaction DNA quantitation system. This method is based on the transition of spherical droplets to polygonal structures at constant volume. Close packed spherical emulsion droplets confined within a microfluidic channel transform into a space filling polygonal lattice as the oil phase evaporates. The microfluidic channel height determines the resulting lattice dimensions such that the mean droplet volume is traceable to the unit of length through a determination of channel height.
, Farkas, N.
and Kramar, J.
Method for Measuring the Volume of Nominally 100 um Diameter Spherical Water-in-Oil Emulsion Droplets, Special Publication (NIST SP), National Institute of Standards and Technology, Gaithersburg, MD, [online], https://doi.org/10.6028/NIST.SP.260-184
(Accessed December 6, 2023)