Synthesis of Responsive Polymer Brushes on Magnetic Nanoparticles

2013 ◽  
Vol 1453 ◽  
Author(s):  
Kamlesh J. Suthar ◽  
Joseph E. Mowat ◽  
Shankar Balasubramanian ◽  
Muralidhar K. Ghantasala ◽  
Derrick C. Mancini
Keyword(s):  
Magnetic Nanoparticles ◽  
Quantum Interference ◽  
Polymer Brushes ◽  
Magnetic Particles ◽  
Polymer Brush ◽  
Precipitation Method ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Co Precipitation ◽  
Microscopy Techniques

ABSTRACTWe report a simple synthesis technique to attached poly(N-isopropylacrylamide) on magnetic nanoparticles. Fe3O4 magnetic nanoparticles were prepared using co-precipitation method. Nearly monodisperse nanoparticles were separated by terminating surface of Fe3O4 with dopamine followed by careful centrifugation and decantation. NHS/EDC coupling chemistry was employed to attached the carboxylic acid terminated poly(N-isopropylacrylamide) to amine end of dopamine on surface of the magnetic particles. Analysis of the polymer brush layers was conducted using UV-Vis spectroscopy, ATR−FTIR, and Transmission electron microscopy techniques. The magnetic property was investigated using direct current superconducting quantum interference device (DC-SQUID) method.

Preparation and characterization of iron oxide nanoparticles coated with chitosan for removal of Cd(II) and Cr(VI) from aqueous solution

2014 ◽  
Vol 70 (6) ◽  
pp. 1004-1010 ◽  
Author(s):  
Th. I. Shalaby ◽  
N. M. Fikrt ◽  
M. M. Mohamed ◽  
M. F. El Kady
Keyword(s):  
Electron Microscope ◽  
Magnetic Nanoparticles ◽  
Magnetic Nanomaterials ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Toxic Heavy Metals ◽  
Transmission Electron ◽  
Magnetite Fe3o4 ◽  
Co Precipitation

This study investigated the applicability of magnetite Fe3O4 nanoparticles coated with chitosan (CMNs) for the removal of some toxic heavy metals from simulated wastewater. Magnetic nanomaterials were synthesized using the co-precipitation method and characterized by transmission electron microscope, scanning electron microscope, X-ray diffraction, and Fourier transformer infrared spectroscopy. The magnetic properties of the prepared magnetic nanoparticles were determined by a vibrating-sample magnetometer. Batch experiments were carried out to determine the adsorption kinetics of Cr(VI) and Cd(II) by magnetic nanoparticles. It is noteworthy that CMNs show a highly efficient adsorption capacity for low concentration Cr(VI) and Cd(II) ions solution, which can reach 98% within 10 min.

scholarly journals Synthesis and Characterization of Functionalized Magnetic Nanoparticles for the Detection of Pesticide

2012 ◽  
Vol 2012 ◽  
pp. 1-7 ◽  
Author(s):  
Shu Taira ◽  
Daisaku Kaneko ◽  
Kazuki Onuma ◽  
Akio Miyazato ◽  
Tomoyuki Hiroki ◽  
...  
Keyword(s):  
Particle Size ◽  
Magnetic Nanoparticles ◽  
Quantum Interference ◽  
Magnetic Particles ◽  
Sodium Metasilicate ◽  
Single Step ◽  
Metal Chlorides ◽  
Potential Measurement ◽  
Transmission Electron ◽  
Subsequent Capture

We synthesized magnetic nanoparticles (MNPs) by mixing aqueous solutions of 3d transition metal chlorides (MCl2·nH2O) and a sodium metasilicate nonahydrate (Na2SiO3·9H2O) in order to produce monodispersed MNPs in a single step. The particle size can be controlled by adjusting the annealing temperature. We characterized the MNPs by X-ray diffraction (XRD), superconducting quantum interference device (SQUID), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR), and zeta-potential measurement. Paramagnetic and superparamagnetic behaviors were found for the obtained samples depending on the particle size (d=3.0–4.6 nm). The synthesized MNPs could be modified with the amino-, phenyl-, and carboxy- groups on MNPs' surface by silanization procedure, respectively. The purpose of functionalizing the surface of the nanoscale magnetic particles was to realize subsequent capture and detection with desired other molecules by nanoparticle assisted laser ionization/desorption mass spectrometry.

Synthesis of Fe2+ Ion Doped ZnS Nanoparticles

2014 ◽  
Vol 879 ◽  
pp. 155-163 ◽  
Author(s):  
Rahizana Mohd Ibrahim ◽  
Markom Masturah ◽  
Huda Abdullah
Keyword(s):  
Electron Microscopy ◽  
Optical Properties ◽  
Quantum Confinement Effect ◽  
Band Gap Energy ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Vis Spectroscopy ◽  
Co Precipitation

Nanoparticles of Zn1-xFexS ( x=0.0,0.1,0.2 and 0.3) were prepared by chemical co-precipitation method from homogenous solution of zinc and ferum salt at room temperature with controlled parameter. These nanoparticles were sterically stabilized using Sodium Hexamethaphospate (SHMP). Here, a study of the effect of Fe doping on structure, morphological and optical properties of nanoparticles was undertaken. Elemental analysis, morphological and optical properties have been investigated by Fourier-Transform-Infrared spectroscopy (FT-IR), X-Ray Fluorescence (XRF), Field Emmision Scanning Electron Microscopy (FESEM), X-ray Diffraction (XRD), Transmission Electron Microscopy (TEM) and UV-Visible Spectroscopy. FTIR measurement confirmed the presence of SHMP in the nanoparticles structure with the FESEM images depicting considerable less agglomeration of particles with the presence of SHMP. While XRF results confirm the presence of Fe2+ ion as prepared in the experiment. The particles sizes of the nanoparticles lay in the range of 2-10 nm obtained from the TEM image were in agreement with the XRD results. The absorption edge shifted to lower wavelengths with an increase in Fe concentration shown in the UV-Vis spectroscopy. The band gap energy value was in the range of 4.95 5.15 eV. The blueshift is attributed to the quantum confinement effect.

Biocompatibility Study of Mn0.5Zn0.5Fe2O4 Magnetic Nanoparticles

2011 ◽  
Vol 483 ◽  
pp. 552-558 ◽  
Author(s):  
Jing Liu ◽  
Jia Zhang ◽  
Li Wang ◽  
Yun Tao Li ◽  
Dong Sheng Zhang
Keyword(s):  
Magnetic Nanoparticles ◽  
Micronucleus Test ◽  
Precipitation Method ◽  
Heating Source ◽  
Transmission Electron ◽  
Significant Difference ◽  
Co Precipitation ◽  
Heating Test ◽  
Ld50 Test

To explore the preparation method of self-prepared Mn0.5Zn0.5Fe2O4magneticnanoparticles and were prepared employing a reduction co-precipitation method, transmission electron microscope (TEM), energy dispersive X-ray spectroscopy (SEM-EDS)were used to characterize the product; The results indicated that the Mn0.5Zn0.5Fe2O4magneticnanoparticles were prepared successfully. EDS showed each Mn0.5Zn0.5Fe2O4magneticnanoparticles contained O, Mn, Zn and Fe elements. The result of heating test showed that Mn0.5Zn0.5Fe2O4can serve as a heating source upon AMF exposure leading the magneticnanoparticles to reach its phase transition temperature (41-47.5°C).To evaluate the biocompatibility of Mn0.5Zn0.5Fe2O4magnetic nanoparticles, which has the potential application in tumor hyperthermia.In the following study it will be used as drug and gene vector, so the compatibility of it should be examined. Then the use acute toxicity (by the mouse of LD50 test), micronucleus (MN) test and hemolysis test were presented to evaluate the toxicity of it in vivo . Its LD50 arrived at 7.1862 g/kg;Micronucleus test showed micronucleus rate of experiment groups had no significant difference compared with negative group. It has no hemolytic .

Blocking Temperature of Magnetite Nanoparticles Fe3O4 Encapsulated Silicon Dioxide SiO2

2020 ◽  
Vol 855 ◽  
pp. 172-176 ◽  
Author(s):  
Togar Saragi ◽  
Hotmas D. Sinaga ◽  
Feni Rahmi ◽  
Gustiani A. Pramesti ◽  
Adi Sugiarto ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Silicon Dioxide ◽  
Temperature Dependence ◽  
Magnetite Nanoparticles ◽  
Quantum Interference ◽  
Blocking Temperature ◽  
Precipitation Method ◽  
Magnetic Characteristics ◽  
Superconducting Quantum Interference Device ◽  
Co Precipitation

One of the important characteristics of magnetic materials is the measurement of magnetic characteristics through Superconducting Quantum Interference Device (SQUID) especially magnetization temperature dependence M(T)ZFC and MTFC measurement. In this work, we reported magnetization temperature dependence measurements of magnetite nanoparticles without SiO2 encapsulation (Fe3O4) and magnetite nanoparticles with SiO2 encapsulation (Fe3O4.SiO2) at the application of magnetic fields of 100 Oe. The nanoparticles magnetite was synthesized by co-precipitation method. It was calculated that the blocking temperature of magnetite nanoparticles Fe3O4 without and with SiO2 encapsulation is 118.38 K and 209.03 K, respectively. The blocking temperatures of magnetic nanoparticles increase by SiO2 encapsulation.

Synthesis and magnetic properties of Fe2O3 nanoparticles for hyperthermia application

2021 ◽  
Vol 2 (109) ◽  
pp. 80-85
Author(s):  
K. Szmajnta ◽  
M.M Szindler ◽  
M. Szindler
Keyword(s):  
Magnetic Properties ◽  
Electron Microscope ◽  
Magnetic Particles ◽  
Biomedical Application ◽  
Energy Dispersive Spectrometer ◽  
Precipitation Method ◽  
Transmission Electron ◽  
Synthesis Procedure ◽  
Co Precipitation ◽  
Practical Implications

Purpose: The main purpose of this publication is to bring closer co-precipitation method of magnetic particles synthesis. Procedure of examining and characterisation of those materials was also shown. Design/methodology/approach: During the work, the properties and possible biomedical application of the material produced were also examined. Surface morphology studies of the obtained particles were made using Zeiss's Supra 35 scanning electron microscope and S/TEM TITAN 80-300 transmission electron microscope. In order to confirm the chemical composition of observed layers, qualitative tests were performed by means of spectroscopy of scattered X-ray energy using the Energy Dispersive Spectrometer (EDS). The Raman spectra of the samples were measured with a InVia Raman microscope by Renishaw. Magnetic properties of hematite nanoparticles were made using VSM magnetometer. Findings: Using VSM magnetometer proved that obtained material is mixture of ferromagnetic and superparamagnetic domain. Practical implications: Magnetic Nanoparticles (MNPs) has been gaining an incrementally increasing interest of scientists in the biomedical areas. Presented materials can be used in the hyperthermia phenomena which can be used in precise cancer treatment. Originality/value: Specific magnetic properties which determinate obtained material to be well for hyperthermia phenomena.

Surface β-Cyclodextrin Polymer Coated Fe3O4 Magnetic Nanoparticles: Synthesis, Characterization and Application on Efficient Adsorption of Malachite Green

2018 ◽  
Vol 54 ◽  
pp. 54-65 ◽  
Author(s):  
Wen Ting Liang ◽  
Dan Li ◽  
Xue Wen Ma ◽  
Wen Juan Dong ◽  
Jing Li ◽  
...  
Keyword(s):  
Magnetic Nanoparticles ◽  
Malachite Green ◽  
Precipitation Method ◽  
Maximum Adsorption Capacity ◽  
Cyclodextrin Polymer ◽  
Transmission Electron ◽  
Langmuir Isotherm Model ◽  
Co Precipitation ◽  
Average Size ◽  
Water Pollutant

Surface β-cyclodextrin polymer coated Fe3O4 magnetic nanoparticles (NPs) were prepared by anchoring pyromellitic dianhydride derivate-b-cyclodextrin polymer (b-CD-P) onto the surface of Fe3O4 magnetic NPs, which is generated in situ through a co-precipitation method. The transmission electron microscopy (TEM) result indicates that Fe3O4@β-CD-P NPs have an effective average size of 15 ± 2 nm. The surface coated layer β-CD-P was confirmed by Fourier-Transformed Infrared Spectroscopy, and the amount of which was determined to be 138.2 mg g-1 by thermogravimetric analysis. To explore the potential application of such nanocomposites for organic pollutants adsorption, malachite green (MG), a typical cancer-causing water pollutant was evaluated by spectrophotometric method. It was finally learnt that, the adsorption rate of MG by Fe3O4@β-CD-P NPs follows pseudo-second-order kinetics with adsorption isotherm fitted by the Langmuir isotherm model well. The maximum adsorption capacity was measured to be 88.49 mg g-1 at 25 °C. Additionally, a good recyclability of the Fe3O4@β-CD-P was observed over four usage cycles, with slight decrease of adsorption capability.

Effect of Different pH on Characterization of Oil-Based Magnetic Fluid

2014 ◽  
Vol 574 ◽  
pp. 338-341
Author(s):  
Zi Fen Zhao ◽  
Hui Ping Shao ◽  
Sen Sun
Keyword(s):  
Saturation Magnetization ◽  
Sodium Oleate ◽  
Magnetic Fluid ◽  
Magnetic Particles ◽  
Precipitation Method ◽  
Transmission Electron ◽  
Ir Transmission ◽  
Ft Ir ◽  
Co Precipitation

In this paper, the oil-based magnetic fluid was prepared by chemical co-precipitation method and sodium oleate was the surfactant. The effect of different pH on the characterization of magnetic fluid was studied. The characterization was detected by Fourier Transform Infrared spectroscopy (FT-IR), Transmission Electron Microscope (TEM) and Vibrating Sample Magnetometer (VSM). The results show that the nanoparticles were coated successfully by sodium oleate at pH=5. And the saturation magnetization of Fe3O4 magnetic nanoparticles is 58.0 emu/g, the saturation magnetization of magnetic fluid prepared is 20.2 emu/g, and the Fe3O4 particles are dispersed well. Although the Fe3O4 magnetic particles coated by sodium oleate at pH = 10.5 has a higher saturation magnetization (67.8 emu/g), but the magnetic fluid is less stable and has an obvious settlement phenomenon.

scholarly journals Core Size and Interface Impact on the Exchange Bias of Cobalt/Cobalt Oxide Nanostructures

2021 ◽  
Vol 7 (3) ◽  
pp. 40
Author(s):  
Maral Ghoshani ◽  
Morteza Mozaafari ◽  
Peter S. Normile ◽  
Jose A. De Toro ◽  
Abdulrahman Al-Nabhani
Keyword(s):  
Exchange Bias ◽  
Quantum Interference ◽  
Precipitation Method ◽  
Core Size ◽  
Superconducting Quantum Interference Device ◽  
X Ray Diffraction ◽  
Grain Sizes ◽  
Oxide Nanostructures ◽  
Transmission Electron ◽  
Co Precipitation

Two series of Co/Co-oxide nanostructures have been synthesized by the co-precipitation method followed by different reduction and oxidation processes in an attempt to optimize their exchange bias (EB) properties. The samples are characterized by X-ray diffraction, scanning and transmission electron microscopy, and SQUID (superconducting quantum interference device) magnetometry. The two series differ with respect to their average Co core grain sizes: in one (the l-series), the size is ≈100 nm, and in the other (the s-series, obtained using lower synthesis temperatures than the l-series), it is ≈10 nm. In the l-series, progressive oxidation yields an increase in the EB field together with a reduction in Co core size. In contrast, progressive oxidation in the s-series results in growth of the Co-oxide fraction at the expense of the Co core upon oxidation, which is accompanied by a decrease in the EB effect that is attributed to an ordering of the ferromagnetic–antiferromagnetic interface and therefore a reduction of uncompensated spins density. These results illustrate how the interface details become relevant only for small enough ferromagnetic cores.

Magnetic and dielectric properties of BiFeO3 nanoparticles

2015 ◽  
Vol 7 (2) ◽  
pp. 1393-1403
Author(s):  
Dr R.P VIJAYALAKSHMI ◽  
N. Manjula ◽  
S. Ramu ◽  
Amaranatha Reddy
Keyword(s):  
Diffuse Reflectance Spectrum ◽  
Precipitation Method ◽  
Secondary Phases ◽  
X Ray Diffraction ◽  
Bifeo3 Nanoparticles ◽  
Transmission Electron ◽  
Multiferroic Bifeo3 ◽  
Pure Phase ◽  
Simple Chemical ◽  
Co Precipitation

Single crystalline nano-sized multiferroic BiFeO3 (BFO) powders were synthesized through simple chemical co-precipitation method using polyethylene glycol (PEG) as capping agent. We obtained pure phase BiFeO3 powder by controlling pHand calcination temperature. From X-ray diffraction studies the nanoparticles were unambiguously identified to have a rhombohedrally distorted perovskite structure belonging to the space group of R3c. No secondary phases were detected. It indicates single phase structure. EDX spectra indicated the appearance of three elements Bi, Fe, O in 1:1:3. From the UV-Vis diffuse reflectance spectrum, the absorption cut-off wavelength of the BFO sample is around 558nm corresponding to the energy band gap of 2.2 eV. The size (60-70 nm) and morphology of the nanoparticles have been analyzed using transmission electron microscopy (TEM).   Linear M−H behaviour and slight hysteresis at lower magnetic field is observed for BiFeO3 nanoparticles from Vibrating sample magnetometer studies. It indicates weak ferromagnetic behaviour at room temperature. From dielectric studies, the conductivity value is calculated from the relation s = L/RbA Sm-1 and it is around 7.2 x 10-9 S/m.

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