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Rapid mixing: A route to synthesize magnetite nanoparticles with high moment
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Image of FIG. 1.
FIG. 1.

(Color online) Set-ups for RM (a) and CM (b) for co-precipitation. In RM, equal amount of ammonia and iron ion source in the two syringes were discharged by a pneumatic cylinder through the mixer into the sample vial. In CM, the yellowish iron ion source (in 10 ml cylinder) was added into ammonia solution (in the beaker) with magnetic stirring (1000 rpm). (c) The XRD (copper anode) intensity pattern for CM and RM particles.

Image of FIG. 2.
FIG. 2.

(Color online) (a). A typical example for the real-time magnetic responses for RM of iron solutions with ammonia. Left scale is in-phase susceptibility () and right scale is out-of phase susceptibility (). (b) The reaction rate of co-precipitation vs. iron ion concentration used in RM. The reaction rate was taken as the value of determined 10 s after mixing normalized with respect to the amount of iron.

Image of FIG. 3.
FIG. 3.

(Color online) TEM micrographs and the particle size distribution of magnetite nanopartices prepared from (a) and (b) RM compared with those obtained from (c) and (d) CM. The red lines are Gaussian fits of the size distribution (b) and (d), manually determined from +1000 particles. Concentrations were 0.2 M iron ion solution and 4 M ammonia.

Image of FIG. 4.
FIG. 4.

(Color online) (a) Magnetic hysteresis loops and (b) the magnified M(H) measurements near the origin for RM and CM nanoparticles, respectively.


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Table I.

Magnetic properties (Ms, & Hc)of magnetite nanoparticles prepared by different methods.

Generic image for table
Table II.

Properties of RM and CM nanoparticles.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Rapid mixing: A route to synthesize magnetite nanoparticles with high moment