• P. SEETHALAKSHMI
• K. RENUKA DEVI
• R. SEEMA
• J. BENAZIR JIYA

Abstract : Pesticides are substances or a mixture of substances, of chemical or biological origin, used by human society. Neem oil is a bio pesticide used by farmers to prevent the formation of pests in plants. It is hydrophobic in nature, for application purposes, it must be formulated with appropriate surfactants. In the present study neem oil is mixed with surfactants viz., sodium dodecyl sulphate (SDS) and cetyl-trimethyl ammonium bromide (CTAB). The density (ρ), viscosity (η) and ultrasonic velocity (U) have been measured for SDS and CTAB in neem oil at 303K. The experimental data have been used to estimate the adiabatic compressibility (β), molar hydration number (n_h), molal hydration number (〖n_h〗^,), apparent molal compressibility (ϕ_k), apparent molal volume (ϕ_v), limiting apparent molal compressibility (ϕ_k^0), limiting apparent molal volume (ϕ_v^0) and their constants (S_k,S_v) and viscosity co-efficients A and B of Jones-Dole equation are found. The variation of these parameters with concentration of surfactant solutions have been discussed in terms of ion-ion, ion-solvent interactions.

Ultrasonic velocity, adiabatic compressibility, hydration number, apparent molal compressibility, apparent molal volume.

"MOLECULAR INTERACTION STUDIES OF SURFACTANTS IN NEEM OIL USING ULTRASONIC TECHNIQUE ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org), ISSN:2349-5162, Vol.6, Issue 2, page no.148-153, February-2019, Available :http://www.jetir.org/papers/JETIR1902324.pdf

"MOLECULAR INTERACTION STUDIES OF SURFACTANTS IN NEEM OIL USING ULTRASONIC TECHNIQUE ", International Journal of Emerging Technologies and Innovative Research (www.jetir.org | UGC and issn Approved), ISSN:2349-5162, Vol.6, Issue 2, page no. pp148-153, February-2019, Available at : http://www.jetir.org/papers/JETIR1902324.pdf