Abstract
The influence of the magnetic nanoparticles Fe3O4 and surfactant coated nanoparticles on the rate of alkaline hydrolysis of tetracaine were investigated spectrophotometrically. The Fe3O4 nanoparticles were synthesized by co-precipitation method. These synthesized nanoparticles were characterized by physical techniques. The XRD patterns showed the crystalline nature and the presence of two bands at 635 cm -1 and 585 cm -1 were assigned to the Fe-O bond vibrations in Fe3O4. The SEM and TEM studies confirmed the spherical structure of nanoparticles. The VSM studies show the magnetic nature. The reaction rate increased linearly with increase in [NaOH]. The rate constant values decreased with the increase in the SDS coated Fe3O4 nanoparticles from 4.0 × 10 -4 s -1 to 1.1 × 10 -4 s -1 in the presence of PEG 1500. Similarly, the increase in the amount of CTABr coated Fe3O4 nanoparticles decreased the rate constant values from 4.0 × 10 -4 s -1 to 1.02 × 10 -4 s -1 in the presence of PEG 1500. The binding constant and rate constant were found to be lower in SDS coated nanoparticles than the CTABr coated particles. The observed results for - [surfactant] in the presence of magnetic nanoparticles and surfactant coated nanoparticles were treated using the pseudophase kinetic model.
Highlights
Magnetic nanoparticles presents many interesting properties that can be used in a wide variety of applications including catalysis, magnetic seals and inks, magnetic recording media, ferrofluids, targeted drug delivery, contrast agents for magnetic resonance imaging and therapeutic agents for cancer treatment and in biomedicine etc. [1,2,3]
In this equation, λ is the wavelength of X-rays (λ = 1.5406 nm), β is the full width at half maximum (FWHM) value, K is Scherrer constant (0.89), θ is the angle of diffraction and D is the particle diameter size
The reaction rate constant values decreased with increase in the amount of polyethylene glycols (PEG) of molecular weights of 1500, 4000, 6000 and 8000 in the presence CTABr@Fe3O4 and SDS@Fe3O4 nanoparticles
Summary
Magnetic nanoparticles presents many interesting properties that can be used in a wide variety of applications including catalysis, magnetic seals and inks, magnetic recording media, ferrofluids, targeted drug delivery, contrast agents for magnetic resonance imaging and therapeutic agents for cancer treatment and in biomedicine etc. [1,2,3]. The added iron nanoparticles into the solution containing NaOH and tetracaine decreased the rate constant values. The decrease in the rate constant values for the alkaline hydrolysis of tetracaine in the presence of Fe3O4 may be attributed to the inhibitive effect of Fe3O4 surfaces.
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