Synthesis of maghemite (γ-Fe2O3) nanoparticles by wet chemical method at room temperature

Single-step synthesis of activated carbon/γ-Fe2O3 nano-composite at room temperature

“…According to Fig. 2b (MAC) the absorption peaks at 598, 628, 801 and 884 cm À 1 are for maghemite [13,14,16,17], which indicate that the g-Fe 2 O 3 nanoparticles are deposited on activated carbon, and this is in agreement with the XRD measurement. The band at 1626 cm À 1 is due to the O-H bending of water [17].…”

“…Darezereshki et al [13,14] have presented a novel single-step method for preparation of super-paramagnetic g-Fe 2 O 3 nanopowder with a high potential for mass production. Regarding the above comments, the aim of this research is to focus on fabricating magnetic g-Fe 2 O 3 -activated carbon nano-composite by an innovative method that has the capability of mass production and application as a facile and convenient way in the production of magnetic activatedcarbon (MAC) nano-composite without expensive organic solvent and complicated equipment.…”

Synthesis and Characterization of CuO Nanoparticles by the Chemical Liquid Deposition Method and Investigation of its Catalytic Effect on the Thermal Decomposition of Ammonium Perchlorate

“…As may seen, the absorption bands at 3420 cm -1 and 1624 cm -1 can be ascribed to the OH stretching and HOH bending mode of adsorbed water, respectively [34], with three obvious absorption peaks around 588 cm −1 , 534 cm −1 and 435 cm −1 which can be assigned to the vibrations of the copper(II)-oxygen bonds [35]. There is also a tiny dip in the spectrum at 2363 cm −1 due to the presence of atmospheric CO 2 [36]. The FT-IR spectrum presented in Figure 4 is quite consistent with those of CuO in previous literature [37].…”

“…Ammonia formation in the presence of metal oxide nanoparticles can also be discussed based on proton transfer theory [36], in which reaction of NH 4 ⁺ with surface oxide ions of spinel accelerates NH 3 formation (Equation 8) and subsequent reactions.…”

Synthesis of Zn2+ substituted maghemite nanoparticles and investigation of their structural and magnetic properties

“…The absorption bands around 500-700 cm -1 are ascribed to the stretching vibration modes of Fe-O bonds on the octahedral and tetrahedral sites and 410-480 cm -1 band is related to symmetric stretching vibration modes of Fe-O bonds on the octahedral sites[24][25][26][27][28][29]. Moreover, the presence of band around 630 cm -1 might be due to the phase transformation from Fe 3 O 4 to γ-Fe 2 O 3 that is corresponded to the vacancies ordering and cation distribution on the octahedral sites[30].…”