Characterization of the magnetic moment distribution in low-concentration solutions of iron oxide nanoparticles by a high-Tc superconducting quantum interference device magnetometer

2015 ◽  
Vol 117 (17) ◽  
pp. 17B321 ◽  
Author(s):  
M. M. Saari ◽  
K. Sakai ◽  
T. Kiwa ◽  
T. Sasayama ◽  
T. Yoshida ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Magnetic Moment ◽  
Quantum Interference ◽  
Oxide Nanoparticles ◽  
Superconducting Quantum Interference Device ◽  
High Tc ◽  
Low Concentration ◽  
Moment Distribution

scholarly journals Synthesis and characterization of dextran-coated iron oxide nanoparticles

2018 ◽  
Vol 5 (3) ◽  
pp. 171525 ◽  
Author(s):  
Andra Mihaela Predescu ◽  
Ecaterina Matei ◽  
Andrei Constantin Berbecaru ◽  
Cristian Pantilimon ◽  
Claudia Drăgan ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Quantum Interference ◽  
Synthesis And Characterization ◽  
Oxide Nanoparticles ◽  
Transmission Electron ◽  
Molar Weight ◽  
Co Precipitation

Synthesis and characterization of iron oxide nanoparticles coated with a large molar weight dextran for environmental applications are reported. The first experiments involved the synthesis of iron oxide nanoparticles which were coated with dextran at different concentrations. The synthesis was performed by a co-precipitation technique, while the coating of iron oxide nanoparticles was carried out in solution. The obtained nanoparticles were characterized by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction spectrometry, Fourier transform infrared spectroscopy and superconducting quantum interference device magnetometry. The results demonstrated a successful coating of iron oxide nanoparticles with large molar weight dextran, of which agglomeration tendency depended on the amount of dextran in the coating solution. SEM and TEM observations have shown that the iron oxide nanoparticles are of about 7 nm in size.

Thermal, Mechanical and Magneto-Mechanical Characterization of Liquid Crystalline Elastomers Loaded with Iron Oxide Nanoparticles

2015 ◽  
Vol 1718 ◽  
pp. 3-7
Author(s):  
Stephany Herrera-Posada ◽  
Barbara O. Calcagno ◽  
Aldo Acevedo
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Liquid Crystalline ◽  
Molar Mass ◽  
Oxide Nanoparticles ◽  
Magnetic Actuation ◽  
Scanning Calorimetry ◽  
Elastomeric Matrix ◽  
Alternating Magnetic Fields

ABSTRACTLiquid crystalline elastomers (LCEs) are materials that reveal unusual mechanical, optical and thermal properties due to their molecular orientability characteristic of low molar mass liquid crystals while maintaining the mechanical elasticity distinctive of rubbers. As such, they are considered smart shape-changing responsive systems. In this work, we report on the preparation of magnetic sensitized nematic LCEs using iron oxide nanoparticles with loadings of up to 0.7 wt%. The resultant thermal and mechanical properties were characterized by differential scanning calorimetry, expansion/contraction experiments and extensional tests. The magnetic actuation ability was also evaluated for the neat elastomer and the composite with 0.5 wt% magnetic content, finding reversible contractions of up to 23% with the application of alternating magnetic fields (AMFs) of up to 48 kA/m at 300 kHz. Thus, we were able to demonstrate that the inclusion of magnetic nanoparticles yields LCEs with adjustable properties that can be tailored by changing the amount of particles embedded in the elastomeric matrix, which can be suitable for applications in actuation, sensing, or as smart substrates.

Thermoresponsive hybrid double-crosslinked networks using magnetic iron oxide nanoparticles as crossing points

2018 ◽  
Vol 9 (37) ◽  
pp. 4642-4650 ◽  
Author(s):  
Thomas Blin ◽  
Antoine Niederberger ◽  
Lazhar Benyahia ◽  
Jérôme Fresnais ◽  
Véronique Montembault ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Alder Reaction ◽  
Diels Alder ◽  
Oxide Nanoparticles ◽  
Magnetic Iron Oxide Nanoparticles ◽  
Diels Alder Reaction ◽  
Crosslinked Networks ◽  
Stimuli Sensitive

Preparation and characterization of stimuli-sensitive hybrid double-crosslinked hydrogels based on iron oxide nanoparticles as the nano-crosslinkers and a difuran-functionalized PEO as the diene partner for the thermoreversible Diels–Alder reaction.

Dendrimer Mediated ‘Bricks and Mortar’ Self-Assembly of Nanoparticles

2002 ◽  
Vol 739 ◽  
Author(s):  
Benjamin L. Frankamp ◽  
Andrew K. Boal ◽  
Vincent M. Rotello
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Self Assembly ◽  
Quantum Interference ◽  
Pamam Dendrimers ◽  
Interparticle Spacing ◽  
Blocking Temperature ◽  
Oxide Nanoparticles ◽  
Particle Spacing

ABSTRACTControl of particle-particle spacing is a key determinant of optical, electronic, and magnetic properties of nanocomposite materials. We have used poly(amidoamine) (PAMAM) dendrimers to assemble carboxylic acid-functionalized mixed monolayer protected clusters (MMPCs) through acid/base chemistry between particle and polymer. IR spectroscopy and selective dendrimer staining, observed by Transmission Electron Microscopy (TEM), establish that the PAMAM dendrimers are the mortar in the assembly and act to space the MMPCs in the resulting aggregates. Small angle X-ray scattering (SAXS) was then used to establish average interparti cle distances; five generations of PAMAM dendrimer (0, 1, 2, 4, 6) were investigated and monotonic increase in interparticle spacing from 4.1 nm to 6.1 nm was observed.Initial studies involving the application of this methodology to control the magnetic properties of 3-iron oxide nanoparticles have been completed. γ-Iron oxide nanoparticles (6.5 nm in diameter) have been assembled with PAMAM dendrimers generations 2.5, 4.5, and 6.5. The resulting aggregates were characterized with SAXS and magnetization obtained on a super conducting quantum interference devise (SQUID). An observed correlation between the blocking temperature (TB) and the average interparticle spacing suggests that our methodology could be used to tailor the magnetic profile of the nanoparticles.

Synthesis and characterization of stable aqueous dispersion of functionalized double-coated iron oxide nanoparticles

2015 ◽  
Vol 160 ◽  
pp. 522-525 ◽  
Author(s):  
Simone F. Medeiros ◽  
João O.C. Filizzola ◽  
Victor F.M. Fonseca ◽  
Paulo F.M. Oliveira ◽  
Taline M. Silva ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Aqueous Dispersion ◽  
Synthesis And Characterization ◽  
Oxide Nanoparticles

Characterization of Oleic-acid-coated Iron-oxide Nanoparticles Synthesized by Using a Coprecipitation Method

2014 ◽  
Vol 64 (3) ◽  
pp. 344-348
Author(s):  
Yousaf IQBAL ◽  
Ilsu RHEE ◽  
Hongsub BAE ◽  
Junghyun BYUN ◽  
Taeyoung JUNG ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Coprecipitation Method ◽  
Oxide Nanoparticles
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