P. Govindarasu, M. Mohamed Nasurudeen, B. Yugeshkumar and E. Siva Subramanian 2017. PRODUCTION OF NANO SILICA USING SOL GEL METHOD BY VARYING THE CONCENTRATION OF SURFACTANT AND TO STUDY ITS BEHAVIOUR IN BLENDED MATERIAL. International Journal of Advance Engineering and Research Development (IJAERD). 4, 3 (Mar. 2017), 474–478.