Acetone was used as a solvent to clean as-received raw egg.
Polypropylene glycol (average molecular weight of the PPG used
in this study is 425 g/mol) was used as a process control agent
(PCA) to remove contaminat ion during the ball milling process.
Decahydron aphthalene (Decalin); N,N-dimethylformam ide
(DMF); and tetrahydrofura n (THF) were all tested in the sonochemical
process to determine which created optimum size reduction
and surface modification of eggshell particles. All the
chemicals used in this study were analytical grade >99% pure
and purchased from Sigma–Aldrich, St. Louis, MO.