Acknowledgements:
Authors are grateful to the Department of Physics Shivaji University
Kolhapur for extending SEM facility. Authors also thank the KIT College
of Engineering, Kolhapur and the D Y Patil Engineering College for
allowing use of their respective facilities for mechanical testing. Dr.
Meghnad G. Joshi acknowledges the research funding support from the
Department of Science and Technology (DST), Govt. of India
(SB/SO/HS/0198/2013).
Disclosure of potential conflicts of interest: The authors
declare no potential conflict of interest.
Author Contributions M.J. designed the project and N.B., K.T.,
J.K., S.S., M.J. wrote the manuscript. N.B., K.T., J.K., S.D. conducted
experiments. S.S. conducted statistics and revised the manuscript.. M.
J. designed the experiments, and wrote, edited, and corresponded this
manuscript. All authors reviewed the manuscript.