scholarly journals Synthesis and Characteristics of Multifunctional Magneto-luminescent Nanoparticles by an Ultrasonic Wave-assisted Stӧber Method

2021 ◽  
Vol 32 (3) ◽  
pp. 75-87
Author(s):  
Tien Dung Chu ◽  
◽  
Hoang Nam Nguyen ◽  
◽  
◽  
...  
Keyword(s):  
Ultrasonic Wave ◽  
Biomedical Applications ◽  
X Ray Diffraction ◽  
Sio2 Matrix ◽  
Stöber Method ◽  
Raman Scattering Spectroscopy ◽  
X Ray ◽  
Saturation Magnetisation ◽  
Transmission Electron ◽  
Luminescent Nanoparticles

Multifunctional magneto-luminescent nanoparticles (NPs) were synthesised by an ultrasonic wave-assisted Stöber method. The multifunctional NPs are composed of magnetic NPs (Fe3O4) and photoluminescent quantum dots (QDs) (ZnS:Mn) in amorphous silica (SiO2) matrix, which was confirmed by X-ray diffraction, Raman scattering spectroscopy, and transmission electron microscopy (TEM). The multifunctional NPs have high saturation magnetisation at room temperature simultaneously with strong photoluminescence (PL) in visible light, which is promising for biomedical applications.

scholarly journals FePt3 nanosuspension synthesized from different precursors – a morphological comparison by SAXS, DLS and TEM

2017 ◽  
Vol 65 (1) ◽  
pp. 79-84
Author(s):  
P. Sarmphim ◽  
S. Soontaranon ◽  
C. Sirisathitkul ◽  
P. Harding ◽  
S. Kijamnajsuk ◽  
...  
Keyword(s):  
Data Storage ◽  
Biomedical Applications ◽  
Average Diameter ◽  
The Other ◽  
X Ray Diffraction ◽  
Morphological Comparison ◽  
X Ray ◽  
Iron Platinum ◽  
X Ray Scattering ◽  
Transmission Electron

Abstract Annealed iron-platinum (FePt) is ferromagnetic in a nanoscale regime which is necessary for energy and data storage, whereas the as-synthesized form of FePt-based nanoparticles exhibits superparamagnetism useful for biomedical applications. In this study, as-synthesized nanosuspensions from the reaction of Pt(acac)2 with Fe(acac)3 and Fe(hfac)3 are compared. X-ray diffraction (XRD) peaks for both samples are assigned to the FePt3 phase. As shown by transmission electron microscopy (TEM) and small angle X-ray scattering (SAXS), nanoparticles synthesized by using Fe(acac)3 have a smaller average diameter, but larger polydispersity index and particle agglomerations. On the other hand, the nanoparticles synthesized by using Fe(hfac)3 can self-assemble into a longer range of patterned monolayer. Dynamic light scattering (DLS), measuring the size of cluster of nanoparticles as well as oleic acid and oleylamine at their surface, confirms that larger agglomerations in the sample were synthesized by using Fe(acac)3. In addition to the size distribution, magnetic properties were influenced by the composition of these nanoparticles.

scholarly journals Influence of the Double Bond LDH Clay on the Exfoliation / Intercalation Mechanism of Polyacrylamide Nanocomposite Hydrogels

2018 ◽  
Vol 55 (3) ◽  
pp. 263-268
Author(s):  
Ionut Cristian Radu ◽  
Eugeniu Vasile ◽  
Celina Maria Damian ◽  
Horia Iovu ◽  
Paul Octavian Stanescu ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Photoelectron Spectroscopy ◽  
Biomedical Applications ◽  
X Ray Diffraction ◽  
X Ray ◽  
Nanocomposite Hydrogels ◽  
Transmission Electron ◽  
Double Hydroxides ◽  
Classical Cross ◽  
Chemical Cross Linking

The paper focuses on the obtaining of novel nanocomposite hydrogels based on polyacrylamide and layered double hydroxides (LDHs) modified with double bonds. The modification of LDH clay was investigated by FTIR, X-ray photoelectron spectroscopy (XPS) and X-ray diffraction (XRD) analyses. Mechanical properties of the nanocomposite hydrogels were employed by compression and rheological measurements. The formation of exfoliated and intercalated structures was evidenced in transmission electron microscopy (TEM). Chemical cross-linking of hydrogels using both classical cross-linker and modified clay was an efficient method to improve the mechanical properties of novel nanocomposite hydrogels. These hydrogels with improved mechanical properties could be further tested for biomedical applications such as tissue engineering.

scholarly journals Biosynthesis of spinel nickel ferrite nanowhiskers and their biomedical applications

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Hajar Q. Alijani ◽  
Siavash Iravani ◽  
Shahram Pourseyedi ◽  
Masoud Torkzadeh-Mahani ◽  
Mahmood Barani ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Nickel Ferrite ◽  
Biomedical Applications ◽  
Leishmania Major ◽  
X Ray Diffraction ◽  
Green Method ◽  
X Ray ◽  
Transmission Electron ◽  
Low Toxicity

AbstractGreener methods for the synthesis of various nanostructures with well-organized characteristics and biomedical applicability have demonstrated several advantages, including simplicity, low toxicity, cost-effectiveness, and eco-friendliness. Spinel nickel ferrite (NiFe2O4) nanowhiskers with rod-like structures were synthesized using a simple and green method; these nanostructures were evaluated by X-ray diffraction analysis, transmission electron microscopy, scanning electron microscopy, and X-ray energy diffraction spectroscopy. Additionally, the prepared nanowhiskers could significantly reduce the survival of Leishmania major promastigotes, at a concentration of 500 μg/mL; the survival of promastigotes was reduced to ≃ 26%. According to the results obtained from MTT test (in vitro), it can be proposed that further studies should be conducted to evaluate anti-leishmaniasis activity of these types of nanowhiskers in animal models.

scholarly journals Synthesis and Characterization of SPIONs for Biomedical applications

2014 ◽  
Vol 70 (a1) ◽  
pp. C743-C743
Author(s):  
Tatiane Britos ◽  
Li Min ◽  
Lilia De Souza Li ◽  
Paula Haddad
Keyword(s):  
Biomedical Applications ◽  
Superparamagnetic Iron Oxide ◽  
Cell Types ◽  
Synthesis And Characterization ◽  
X Ray Diffraction ◽  
X Ray ◽  
Mercaptosuccinic Acid ◽  
Transmission Electron ◽  
Oxidized Iron

This work reports the synthesis and characterization of superparamagnetic iron oxide nanoparticles (SPIONs), with great potential for biomedical applications. SPIONs were prepared through a decomposition of Fe(acac)3 in the presence of 1,2 hexadecanodiol (reducing agent), oleic acid and oleylamine (ligands) in a hot organic solvent. The mercaptosuccinic acid (MSA) and 2,3- dimercaptosuccinic acid (DMSA) were exchanged onto the nanocrystal surface making the particles stable in water. The thiolated nanoparticles (SH-NPs) were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD), transmission electron microscopy (TEM), and vibrating sample magnetometry (VSM). The as-prepared sample presented an amorphous partially oxidized iron structure. The results showed that the SH-NPs have a mean diameter of 6 nm and display superparamagnetic behavior at room temperature. Preliminary tests of incorporation of these systems were evaluated in Hela cells and stem cells. The results showed that the thiolated nanoparticles have no toxic effects for both cell types with good incorporation after 6 hours of transfection. Magnetic resonance image (MRI) were also carried and showed that the MNPs increase the contrast in systems investigated. Acknowledgements: FAPESP (2011/10125-0), CNPq, CAPES, UNICAMP

Fabrication of Single-Crystal Nanospherical Hydroxyapatite Powder for Biomedical Applications

2010 ◽  
Author(s):  
Peyman Honarmandi
Keyword(s):  
Single Crystal ◽  
Biomedical Applications ◽  
Milling Process ◽  
Morphological Properties ◽  
Biological Applications ◽  
Hydroxyapatite Nanoparticles ◽  
X Ray Diffraction ◽  
X Ray ◽  
Hydroxyapatite Powder ◽  
Transmission Electron

The competence and compatibility of biomaterials is always challenging and demanding in biotech industries. Hydroxyapatite (HAp) is a useful biomaterial for biological applications due to its especial properties. In this paper, a dry mechanochemical process is introduced to produce hydroxyapatite nanoparticles. Structural and morphological properties of HAp powder are studied by X-ray diffraction (XRD) and transmission electron microscopy (TEM). The results show that the single-crystal HAp nanospherical particles are successfully produced during milling process. Two different metallic and polymeric vials are applied and the results are compared for both vials. The results verify that the HAp nanoparticles are single crystal and their sizes are in the ranges of 12–24 nm.

scholarly journals Towards the Development of Antioxidant Cerium Oxide Nanoparticles for Biomedical Applications: Controlling the Properties by Tuning Synthesis Conditions

Nanomaterials ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 542
Author(s):  
Noemi Gallucci ◽  
Giuseppe Vitiello ◽  
Rocco Di Girolamo ◽  
Paola Imbimbo ◽  
Daria Maria Monti ◽  
...  
Keyword(s):  
Biomedical Applications ◽  
Multidisciplinary Approach ◽  
Alkyl Chain ◽  
Synthesis Temperature ◽  
Alkyl Chain Length ◽  
Water Soluble ◽  
X Ray Diffraction ◽  
X Ray ◽  
Synthesis Conditions ◽  
Transmission Electron

In this work CeO2 nanoparticles (CeO2-NPs) were synthesized through the thermal decomposition of Ce(NO3)3·6H2O, using as capping agents either octylamine or oleylamine, to evaluate the effect of alkyl chain length, an issue at 150 °C, in the case of octylamine and at 150 and 250 °C, in the case of oleylamine, to evaluate the effect of the temperature on NPs properties. All the nanoparticles were extensively characterized by a multidisciplinary approach, such as wide-angle X-ray diffraction, transmission electron microscopy, dynamic light scattering, UV-Vis, fluorescence, Raman and FTIR spectroscopies. The analysis of the experimental data shows that the capping agent nature and the synthesis temperature affect nanoparticle properties including size, morphology, aggregation and Ce3+/Ce4+ ratio. Such issues have not been discussed yet, at the best of our knowledge, in the literature. Notably, CeO2-NPs synthesized in the presence of oleylamine at 250 °C showed no tendency to aggregation and we made them water-soluble through a further coating with sodium oleate. The obtained nanoparticles show a less tendency to clustering forming stable aggregates (ranging between 14 and 22 nm) of few NPs. These were tested for biocompatibility and ROS inhibiting activity, demonstrating a remarkable antioxidant activity, against oxidative stress.

Chemical Synthesis of Rare Earth (La, Gd) Doped Cobalt Ferrite and a Comparative Analysis of Their Magnetic Properties

2020 ◽  
Vol 20 (8) ◽  
pp. 5239-5245
Author(s):  
Meenal Gupta ◽  
Anusree Das ◽  
Dipankar Das ◽  
Satyabrata Mohapatra ◽  
Anindya Datta
Keyword(s):  
Rare Earth ◽  
Cobalt Ferrite ◽  
Tetrahedral Site ◽  
X Ray Diffraction ◽  
X Ray ◽  
Saturation Magnetisation ◽  
Transmission Electron ◽  
Magnetization Data ◽  
Trivalent Cations ◽  
Rare Earth La

Lanthanum (La) and gadolinium (Gd) doped cobalt ferrite nanoparticles are synthesized using a soft chemical approach. The analysis of these ferrites using X-ray diffraction (XRD) and transmission electron microscopy (TEM) shows that lattice spacing decreases in the doped ferrite samples. Magnetization data indicates towards the decrease of saturation magnetisation but increase in coercivity with doping. Mössbauer spectroscopy measurements at room temperature indicate increased occupancy of trivalent cations at tetrahedral site. The addition of rare earth dopants reduces the hard-magnetic character of cobalt ferrite.

Formation of Si Nanocrystals in Thin SiO2 Films for Memory Device Applications

2010 ◽  
Vol 644 ◽  
pp. 101-104 ◽  
Author(s):  
Mario Curiel ◽  
Ivan Petrov ◽  
Nicola Nedev ◽  
Diana Nesheva ◽  
Mauro R. Sardela ◽  
...  
Keyword(s):  
Memory Device ◽  
X Ray Diffraction ◽  
Sio2 Matrix ◽  
Furnace Annealing ◽  
X Ray ◽  
Force Microscopy ◽  
Atomic Force ◽  
Transmission Electron ◽  
Si Nanocrystals ◽  
Device Applications

X-ray Diffraction and Reflectivity, Transmission Electron Microscopy and Atomic Force Microscopy were applied to study the effect of thermal annealing on the properties of thin SiOx films (~ 15 nm) prepared by thermal evaporation of SiO in vacuum. It has been shown that furnace annealing at 1000 oC causes phase separation and formation of uniformly distributed Si nanocrystals into a SiO2 matrix. Clockwise hysteresis has been observed in the C-V curves measured and explained by assuming charging and discharging of the NCs with carriers, which tunnel from the Si substrate.

Production of nearly monodisperse Fe3O4 and Fe@Fe3O4 nanoparticles in aqueous medium and their surface modification for biomedical applications

2017 ◽  
Vol 31 (04) ◽  
pp. 1750014 ◽  
Author(s):  
Tirusew Tegafaw ◽  
Wenlong Xu ◽  
Sang Hyup Lee ◽  
Kwon Seok Chae ◽  
Yongmin Chang ◽  
...  
Keyword(s):  
Aqueous Medium ◽  
Photoelectron Spectroscopy ◽  
Quantum Interference ◽  
Biomedical Applications ◽  
Ir Absorption ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Surface Modified ◽  
Surface Modified Nanoparticles

Iron (Fe)-based nanoparticles are extremely valuable in biomedical applications owing to their low toxicity and high magnetization values at room temperature. In this study, we synthesized nearly monodisperse iron oxide (Fe3O4) and Fe@Fe3O4 (core: Fe, shell: Fe3O[Formula: see text] nanoparticles in aqueous medium under argon flow and then, coated them with various biocompatible ligands and silica. In this study, eight types of surface-modified nanoparticles were investigated, namely, Fe3O4@PAA (PAA = polyacrylic acid; [Formula: see text] of PAA = 5100 amu and 15,000 amu), Fe3O4@PAA–FA (FA = folic acid; [Formula: see text] of PAA = 5100 amu and 15,000 amu), Fe3O4@PEI–fluorescein (PEI = polyethylenimine; [Formula: see text] of PEI = 1300 amu), Fe@Fe3O4@PEI ([Formula: see text] of PEI = 10,000 amu), Fe3O4@SiO2 and Fe@Fe3O4@SiO2 nanoparticles. We characterized the prepared surface-modified nanoparticles using high-resolution transmission electron microscopy (HRTEM), X-ray diffraction (XRD), Fourier transform infrared (FT-IR) absorption spectroscopy, a superconducting quantum interference device (SQUID), X-ray photoelectron spectroscopy (XPS), photoluminescence (PL) spectroscopy and confocal microscopy. Finally, we measured the cytotoxicity of the samples. The results indicate that the surface-modified nanoparticles are biocompatible and are potential candidates for various biomedical applications.

Heteroepitaxial CxSil−X/Si(100) Metastable Alloys

1990 ◽  
Vol 198 ◽  
Author(s):  
J.B. Posthill ◽  
R.A. Rudder ◽  
S.V. Hattangady ◽  
G.G. Fountain ◽  
T.P. Humphreys ◽  
...  
Keyword(s):  
Chemical Vapor ◽  
Epitaxial Films ◽  
X Ray Diffraction ◽  
Raman Scattering Spectroscopy ◽  
X Ray ◽  
Transmission Electron ◽  
Ir Reflectance ◽  
Metastable Alloys ◽  
Carbon Concentrations ◽  
Reflectance Data

ABSTRACTMetastable CxSi1− epitaxial films have been grown on Si(100) by remote plasmaenhanced chemical vapor deposition. Carbon concentrations of ∼ 3 atomic percent have been achieved at a growth temperature of 725 °C. No evidence for the formation or precipitation of SiC was found using x-ray diffraction, Raman scattering spectroscopy, IR. reflectance, or transmission electron microscopy. IR reflectance data gives a preliminary indication that the carbon has been incorporated onto substitutional sites in the Si lattice.

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