Department of Pharmaceutical Sciences, University of Kentucky, Lexington, KY 40506, USA;
Electron Microscopy Center, University of Kentucky, Lexington, KY 40506, USA;
Department of Chemical Engineering and Material Sciences, University of Kentucky, Lexington, KY 40506, USA;
Department Industrial & Physical Pharmacy, College of Pharmacy, Purdue University, West Lafayette, IN 47907, USA;