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.