Investigation of Statistical Experimental Design Results Showing UV-Vis Absorbance Values of Characterized Alpha and Gamma Fe2O3 Nanoparticles

Abstract

Ultraviolet-visible (UV-Vis) spectroscopy is generally used in the characterization of metal and metal-based nanomaterials as they possess
sensitive optic properties that vary with size, volume, aggregating state. UV-visible absorption spectra of α-Fe2O3 (20-40 nm), γ-Fe2O3
(20-40 nm), were determined between 300 and 800 nm using UV-visible spectrophotometer (Optima, SP-3000 Nano). It is concluded that
among selected parameters for α-Fe2O3 (20-40 nm), particle dose and period have an impact decreasing absorbance value. When absolute
values of coefficients are examined, effect order is period and dose. According to the results of statistical table provided for γ-Fe2O3 (20-40
nm) NP, correlation coefficient (R2 ) value for appropriate Quadratic model is respectively determined as multiple R=89.78%, R2 =80,61%
and adjusted R2 =66.76%. Determination of (R2 ) as 80.61% shows that compatibility between observed values and foreseen values is high
and applied model takes place in confidence range. As a result of the evaluation, it is concluded that among selected parameters for γFe2O3
(20-40 nm), particle concentration and period have an impact decreasing absorbance value. Considering all statistical data, it is concluded that
maximum effect is observed in a period between 24-30 hours and 25 ppm absorbance concentration is more efficient. In all NPs, absorbance
value decreases in periods below 24 hours and above 36 hours. Again likewise, the effect decreases in cases where absorbance dose is low or
very high. Considering all data, it is concluded that the effect varies according to type and size of NP and this variance is meaningful.