Templated Synthesis of Magnetic Nanoparticles through the Self-Assembly of Polymers and Surfactants

Nguyen, Vo Thu An; Gauthier, Mario; Sandre, Olivier

doi:10.3390/nano4030628

Cited by 24 publications

(26 citation statements)

References 64 publications

(102 reference statements)

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“…(The statistical size analysis were carried out for N > 50.) This is in agreement with Gao et al, 39 Yang et al, 40 and Nguyen et al 41 zero and a small, nonzero value), some particle agglomeration with passing time is inevitable. Figure 9 represents this graphically and qualitatively with an accompanying TEM image to show the resulting NPs.…”

Section: Rcooh Rcoo H and Rcnh H Rcnh 2supporting

confidence: 90%

Analysis of the Interaction of Surfactants Oleic Acid and Oleylamine with Iron Oxide Nanoparticles through Molecular Mechanics Modeling

2015

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The interface interactions between surfactants oleic acid and oleylamine and magnetic nanoparticles are studied via molecular mechanics and dynamics. Mixtures of these two surfactants are widely advocated in the chemical synthesis of nanoparticles. However, the exact dynamic mechanism remains unclear. Here we report, for the first time, a comprehensive qualitative model showing the importance of acid-base complex formation between oleic acid and oleylamine as well as the presence of free protons in the engineering of nanoparticles of specific shapes and sizes. We show why critical parameters such as surfactant concentration may modify iron oxide nanoparticle shape and size and how this can be understood in the light of acid-base complex pair formation. We report on the influence these parameters have on both the in situ nanoparticle surface charge and zeta potential. Transmission electron microscopy (TEM), FTIR, and pH studies are used to confirm the validity of the calculated binding energies and number of acid-base pairs.

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Section: Rcooh Rcoo H and Rcnh H Rcnh 2supporting

confidence: 90%

Analysis of the Interaction of Surfactants Oleic Acid and Oleylamine with Iron Oxide Nanoparticles through Molecular Mechanics Modeling

2015

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“…After drying on TEM grids, the particles synthesized in acetone form a particle network ( Figure 1 a–c), connected by a large amount of small clusters, which is a typical phenomenon after ferro-fluidic colloid drying [ 29 , 30 , 31 , 32 , 33 , 34 ]. The average size of the particles is estimated to be 5–6 nm ( Figure 1 d).…”

Section: Resultsmentioning

confidence: 99%

Magnetic Fe@FeOx, Fe@C and α-Fe2O3 Single-Crystal Nanoblends Synthesized by Femtosecond Laser Ablation of Fe in Acetone

et al. 2018

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There are few reports on zero-field-cooled (ZFC) magnetization measurements for Fe@FeOx or FeOx particles synthesized by laser ablation in liquids (LAL) of Fe, and the minimum blocking temperature (TB) of 120 K reported so far is still much higher than those of their counterparts synthesized by chemical methods. In this work, the minimum blocking temperature was lowered to 52 K for 4–5 nm α-Fe2O3 particles synthesized by femtosecond laser ablation of Fe in acetone. The effective magnetic anisotropy energy density (Keff) is calculated to be 2.7–5.4 × 105 J/m3, further extending the Keff values for smaller hematite particles synthesized by different methods. Large amorphous-Fe@α-Fe2O3 and amorphous-Fe@C particles of 10–100 nm in diameter display a soft magnetic behavior with saturation magnetization (Ms) and coercivities (Hc) values of 72.5 emu/g and 160 Oe at 5 K and 61.9 emu/g and 70 Oe at 300 K, respectively, which mainly stem from the magnetism of amorphous Fe cores. Generally, the nanoparticles obtained by LAL are either amorphous or polycrystalline, seldom in a single-crystalline state. This work also demonstrates the possibility of synthesizing single-crystalline α-Fe2O3 hematite crystals of several nanometers with (104), (113), (116) or (214) crystallographic orientations, which were produced simultaneously with other products including carbon encapsulated amorphous Fe (a-Fe@C) and Fe@FeOx core-shell particles by LAL in one step. Finally, the formation mechanisms for these nanomaterials are proposed and the key factors in series events of LAL are discussed.

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“…Furthermore, compared with the precursor IPN NGs, the D h of 8.1 wt% magnetic NGs decreased and was about 89 nm smaller than that of the IPN NGs. This may be due to the interaction of the iron oxide particles with polymer networks . Meanwhile, the polydispersity index of 8.1 wt% magnetic NGs was only 0.070, which was narrower than that of IPN.…”

Section: Resultsmentioning

confidence: 87%

Synthesis and self‐assembly of multiple‐responsive magnetic nanogels

Yao

Shi

et al. 2018

Polymers for Advanced Techs

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In this paper, temperature and pH-sensitive interpenetrating polymer network (IPN) nanogels (NGs) were firstly prepared, and magnetic hybrid NGs were made through in-situ precipitation of Fe 2+ and Fe 3+ into the IPN NGs. Under the optimized condition, the resulting hybrid NG dispersion with up to 17.3 wt% magnetite was stable, while the size distribution of the NGs is broad due to the formation of Fe 3 O 4 nanoparticles outside the NGs. In order to synthesize relatively uniform magnetic NGs, magnetite content was reduced to 8.1 wt% magnetite. The NGs with 8.1 wt% magnetite can quickly self-assemble into colloidal crystals induced by magnet, while such NGs slowly self-assembled into colloidal crystals without external magnetic field. Furthermore, the reflection wavelength of the self-assembled magnetic NGs showed red-shift with increasing pH and temperature.

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Templated Synthesis of Magnetic Nanoparticles through the Self-Assembly of Polymers and Surfactants

Cited by 24 publications

References 64 publications

Analysis of the Interaction of Surfactants Oleic Acid and Oleylamine with Iron Oxide Nanoparticles through Molecular Mechanics Modeling

Analysis of the Interaction of Surfactants Oleic Acid and Oleylamine with Iron Oxide Nanoparticles through Molecular Mechanics Modeling

Magnetic Fe@FeOx, Fe@C and α-Fe2O3 Single-Crystal Nanoblends Synthesized by Femtosecond Laser Ablation of Fe in Acetone

Synthesis and self‐assembly of multiple‐responsive magnetic nanogels

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