Magnetic field-assisted hydrothermal growth of chain-like nanostructure of magnetite

The Fabrication and Magnetic Properties of Ni Fibers Synthesized Under External Magnetic Fields

“…[33,34] In addition, all the AF samples have a significantly increased coercivity (133.8-147.5 Oe) than the ZF sample (115.1 Oe), which is consistent with the observation that all the AF samples have larger values for the squareness (M r /M s , 0.36-0.40) than the ZF sample (0.26). The increased H c and M r /M s values of the Ni fibers prepared under an external magnetic field relative to that of the sample in the absence of the external magnetic field may largely be attributed to the oriented growth of Ni nanocrystallites under the attractive force of the external magnetic field, [6,35,36] which might be well utilized to improve the coercivity of materials as is expected. However, the reasons leading to the differences among the M r /M s and H c values of various AF samples remain unknown at this stage.…”

Photosynthetic Toxicity and Oxidative Damage Induced by nano-Fe3O4 on <i>Chlorella vulgaris</i> in Aquatic Environment

“…Compared with bulk Fe 3 O 4 , nano-Fe 3 O 4 has unique characteristics as superparamagnetism, size and quantum tunnel effects, and so on [2][3][4][5][6]. As an important member of the spinel ferrite family, Fe 3 O 4 is among the most widely used soft magnetic materials.…”

Multifunctional Nanocomposites Based on Mesoporous Silica: Potential Applications in Biomedicine

“…), Fe 2+ and Fe 3+ ratio, pH, and ionic strength of the media (Gupta & Gupta, 2005). Other methods to prepare magnetite nanoparticles are microemulsion (Liu & Wang, 2004a), electrochemical synthesis (Franger et al, 2004), pyrolysis (Gun'ko et al, 2001), and hydrothermal synthesis (Wu et al, 2005). However, most methods present some synthesis problems, such as difficulties in the prevention of flocculation, the control of Fe 2+ and Fe 3+ ratio in the co-precipitation process, and the removal of surfactants in the micron-emulsion process.…”