Reversible Photo-Switching of the Magnetization of Iron Oxide Nanoparticles at Room Temperature

2004 ◽  
Vol 43 (45) ◽  
pp. 6135-6139 ◽  
Author(s):  
Rie Mikami ◽  
Minori Taguchi ◽  
Koji Yamada ◽  
Koji Suzuki ◽  
Osamu Sato ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Room Temperature ◽  
Oxide Nanoparticles

scholarly journals Facile aqueous, room temperature preparation of high transverse relaxivity clustered iron oxide nanoparticles

2019 ◽  
Vol 570 ◽  
pp. 165-171 ◽  
Author(s):  
Nicholas J. Hobson ◽  
Xian Weng ◽  
Marianne Ashford ◽  
Nguyen T.K. Thanh ◽  
Andreas G. Schätzlein ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Room Temperature ◽  
Oxide Nanoparticles ◽  
Temperature Preparation

Synthesis and Effect of Some Parameters through Reverse Micelles Route of Iron Oxide Nanoparticles

2009 ◽  
Vol 152-153 ◽  
pp. 205-208 ◽  
Author(s):  
H. Arabi ◽  
S. Nateghi ◽  
S. Sadeghi
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Reverse Micelles ◽  
Room Temperature ◽  
Molar Ratio ◽  
Oxide Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Significant Difference ◽  
Vibration Sample Magnetometer

Iron oxide nanoparticles were synthesis by reverse micelle method. X-ray diffraction technique and vibration sample magnetometer were applied to characterize the produced samples at different conditions and parameters for synthesis route. There is no significant difference between samples prepared at 5°C and room temperature except a better crystalline at room temperature. The molar ratio of water to surfactant (w parameter) and concentration of the salt solution on size and magnetic properties of nanoparticles have been investigated. Increasing w leads to producing particles with larger size i.e. for w=16.83, 11.22, and 5.6, particles size are 15.22, 11.66 and 10.5 nm, respectively. The size of nanoparticles are in the range of 9 to 20 nanometers

scholarly journals Optimization of the catalytic performance of Pd/Fe3O4 nanoparticles prepared via microwave-assisted synthesis for pharmaceutical and catalysis applications

2019 ◽  
Vol 9 (1) ◽  
pp. 3794-3799 ◽  
Keyword(s):  
Carbon Monoxide ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Room Temperature ◽  
Catalytic Performance ◽  
Oxidation Catalysis ◽  
Microwave Assisted Synthesis ◽  
Oxide Nanoparticles ◽  
X Ray ◽  
Microwave Assisted

Microwave assisted synthesis technique was used to prepare palladium supported on iron oxide nanoparticles. The advantage of using microwave irradiation as a synthetic tool is due to its unique features as a one step, simple, versatile, and rapid process. The reactants are added simply at room temperature without using high-temperature injection. Hydrazine hydrate was added by the following ratios (0.1, 0.2, 0.3, 0.4, 0.6, 0.8, 1, 1.6, and 3) ml to the different prepared samples at room temperature in order to investigate its effect on the catalytic performance of the prepared catalysts. The prepared catalyst could be used as an ideal candidate not only for Pharmaceutical industry through cross-coupling reactions but also for low temperature oxidation catalysis of carbon monoxide and pharmaceutical applications as well. The experimental results showed that Pd/Fe3O4 catalyst has a remarkable catalytic activity for carbon monoxide oxidation catalysis due to the strong interaction between palladium and iron oxide nanoparticles. This may be due to the small particle size (7-14 nm) and concentration ratio of the Pd nanoparticles dispersed on the surface of magnetite (Fe3O4). Those nanoparticles were characterized by various spectroscopic techniques including; X-ray photoelectron spectroscopy (XPS), X-ray diffraction (XRD), Vibrating Sample Magnetometer (VSM) and transmission electron microscopy (TEM).

scholarly journals Magnetization and Specific Absorption Rate Studies of Ball-Milled Iron Oxide Nanoparticles for Biomedicine

2013 ◽  
Vol 2013 ◽  
pp. 1-13 ◽  
Author(s):  
P. Burnham ◽  
N. Dollahon ◽  
C. H. Li ◽  
A. J. Viescas ◽  
G. C. Papaefthymiou
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Room Temperature ◽  
Average Diameter ◽  
Magnetic Interactions ◽  
Spherical Particles ◽  
Oxide Nanoparticles ◽  
Zero Field ◽  
Specific Absorption ◽  
Spectroscopic Signatures

Comparative studies are presented of iron oxide nanoparticles in the 7–15 nm average diameter range ball milled in hexane in the presence of oleic acid. Transmission electron microscopy identified spherical particles of decreasing size as milling time and/or surfactant concentration increased. Micromagnetic characterization via Mössbauer spectroscopy at room temperature yielded broadened magnetic spectroscopic signatures, while macromagnetic characterization via vibrating sample magnetometry of 7-8 nm diameter particles showed largely superparamagnetic behavior at room temperature and hysteretic at 2 K. Zero-field and field-cooled magnetization curves exhibited a broad maximum at ~215 K indicating the presence of strong interparticle magnetic interactions. The specific absorption rates of ferrofluids based on these nanoparticle preparations were measured in order to test their efficacies as hyperthermia agents.

Tuning the Magnetic Properties of Iron Oxide Nanoparticles by a Room-Temperature Air-Atmosphere (RTAA) Co-Precipitation Method

2015 ◽  
Vol 15 (5) ◽  
pp. 3870-3878 ◽  
Author(s):  
S. Vikram ◽  
M. Dhakshnamoorthy ◽  
R. Vasanthakumari ◽  
A. R. Rajamani ◽  
Murali Rangarajan ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Room Temperature ◽  
Precipitation Method ◽  
Oxide Nanoparticles ◽  
Air Atmosphere ◽  
Co Precipitation

scholarly journals Magnetic Properties and Biological Activity Evaluation of Iron Oxide Nanoparticles

2013 ◽  
Vol 2013 ◽  
pp. 1-7 ◽  
Author(s):  
Alina Mihaela Prodan ◽  
Simona Liliana Iconaru ◽  
Carmen Mariana Chifiriuc ◽  
Coralia Bleotu ◽  
Carmen Steluta Ciobanu ◽  
...  
Keyword(s):  
Antimicrobial Activity ◽  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Room Temperature ◽  
Aqueous Suspension ◽  
Hysteresis Loops ◽  
Biological Properties ◽  
Oxide Nanoparticles ◽  
Metallic Ions ◽  
Tem Analysis

The aim of this study was to provide information about the biological properties of iron oxide nanoparticles (IO-NPs) obtained in an aqueous suspension. The IO-NPs were characterized by transmission electron microscopy (TEM). Analysis of hysteresis loops data at room temperature for magnetic IO-NPs sample indicated that the IO-NPs were superparamagnetic at room temperature. The calculated saturation magnetization for magnetic iron oxide wasMs= 18.1 emu/g. The antimicrobial activity of the obtained PMC-NPs was tested against Gram-negative (Pseudomonas aeruginosa1397,Escherichia coliATCC 25922), Gram-positive (Enterococcus faecalisATCC 29212,Bacillus subtilisIC 12488) bacterial as well as fungal (Candida krusei963) strains. The obtained results suggested that the antimicrobial activity of IO-NPs is dependent on the metallic ions concentrations and on the microbial growth state, either planktonic or adherent. The obtained IO-NPs exhibited no cytotoxic effect on HeLa cells at the active antimicrobial concentrations.

scholarly journals Ex situ integration of iron oxide nanoparticles onto the exfoliated expanded graphite flakes in water suspension

2014 ◽  
Vol 79 (9) ◽  
pp. 1155-1167 ◽  
Author(s):  
Natasa Jovic ◽  
Maria Calatayud ◽  
Beatriz Sanz ◽  
Amelia Montone ◽  
Gerardo Goya
Keyword(s):  
Iron Oxide ◽  
Iron Oxide Nanoparticles ◽  
Room Temperature ◽  
Expanded Graphite ◽  
Ex Situ ◽  
Hybrid Structures ◽  
Chemical Characteristics ◽  
Oxide Nanoparticles ◽  
Physico Chemical ◽  
Branched Polyethylenimine

Hybrid structures composed of exfoliated expanded graphite (EG) and iron oxide nanocrystals have been produced by an ex situ process. The iron oxide nanoparticles coated with meso-2,3-dimercaptosuccinic acid (DMSA), or poly(acrylic) acid (PAA) were integrated onto the exfoliated EG flakes by mixing their aqueous suspensions at room temperature under support of 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC) and N-hydroxysuccin-nimide (NHS). EG flakes have been used both, naked and functionalized with branched polyethylenimine (PEI). Complete integration of two constituents has been achieved and mainteined stable for more than 12 months. No preferential spatial distribution of anchoring sites for attachement of iron oxide nanoparticles has been observed, regardless EG flakes have been used naked or functionalized with PEI molecules. The structural and physico-chemical characteristics of the exfoliated expanded graphite and its hybrids nanostructures has been investigated by SEM, TEM, FTIR and Raman techniques.

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