Application of mixed colloidal magnetic fluid of single domain Fe3O4 and NiFe2O4 ferrite nanoparticles in audio speaker Journal title: International Journal of engineering Research and Applications Authors: S. D. Kemkar, Milind Vaidya, Dipak Pinjari, Sammit Karekar, Sanjana Kemkar, Siddhesh Nanaware, Sanju... Subject(s):