Effects of organic polymer addition in magnetite synthesis on the crystalline structure

Abstract

Various polymers with different functional groups and surface charges were added to the precursor solution of Fe3O4 to clarify the relationship between the chemical structure of the organic substances and the crystal structure of Fe3O4.

Facile synthesis, characterization of various polymer immobilized on magnetite nanoparticles applying the coprecipitation method

“…They used poly-(diallyldimethylammonium chloride) (PDDAC), poly(sodium-4-styrene sulfonate) (PSS), polyacrylic acid (PAA), and polyethylene glycol (PEG), and reported that the crystalline sizes were in the range of 7.3-14.4 nm. 31 Our experimental results in this study also agree well with their result. However, while MNP was not formed in the presence of PAA in the Kuwahara's study, MNP synthesis was confirmed in our experiment.…”

“…Kuwahara et al examined the effects of the chemical structure of organic substances on the crystalline structure and size of magnetite by adding various polymers to the precursor solution of magnetite. They used poly‐(diallyldimethylammonium chloride) (PDDAC), poly(sodium‐4‐styrene sulfonate) (PSS), polyacrylic acid (PAA), and polyethylene glycol (PEG), and reported that the crystalline sizes were in the range of 7.3–14.4 nm 31 . Our experimental results in this study also agree well with their result.…”

“…It is known that the formation of Fe 3 O 4 by the coprecipitation method proceeds through the following reaction 31,32 :…”

“…Since Fe(OH) 2 is an essential intermediate to form Fe 3 O 4 , if it was not produced sufficiently, formation of Fe 3 O 4 could be inhibited. 31 In this study, however, the synthesis reaction was performed under a nitrogen atmosphere. Therefore, Fe 2+ was not oxidized and formation of Fe 3 O 4 was not interfered.…”

Structural control of magnetite nanoparticles for hyperthermia by modification with organic polymers: effect of molecular weight

“…12 Authors have found that the size and magnetic properties of the Fe 3 O 4 nanoparticles vary depending on the functional groups of the added organic molecules added during the aqueous synthesis of Fe 3 O 4 , and that other types of iron hydroxide will form depending on the synthetic conditions. 13,14 However, the effects that the polymer molecular weight and functional groups have on the crystalline phase and the heat generation characteristics of the resulting conjugates have not been comprehensively investigated. Therefore, the purpose of this study was to clarify these points in terms of the molecular weight and the charge of the functional groups of the added polymers.…”