Determination of nanoparticle sizes by X-ray diffraction

“…This type of analysis is based on the diffraction line profile, where the Scherrer 21 method is the most used for its simplicity, which may lead to results with little accuracy associated with the complexity of the diffraction pattern. However, exist more efficient methodologies for this calculation such as the Warren-Averbach modified method 21 . Given the complexity of determining the sample crystal phase of XRD spectrum, this calculation was not performed in our study.…”

Section: Resultsmentioning

confidence: 99%

Synthesis and characterization of Fe3O4 nanoparticles with perspectives in biomedical applications

2014

View full text Add to dashboard Cite

Nowadays the use of magnetic nanoparticles (MNP) in medical applications has exceeded expectations. In molecular imaging, MNP based on iron oxide coated with appropriated materials have several applications in vitro and in vivo studies. For applications in nanobiotechnology these MNP must present some characteristics such as size smaller than 100 nanometers, high magnetization values, among others. Therefore the MNP have physical and chemical properties that are specific to certain studies which must be characterized for quality control of the nanostructured material. This study presents the synthesis and characterization of MNP of magnetite (Fe 3 O 4 ) dispersible in water with perspectives in a wide range of biomedical applications. The characterization of the colloidal suspension based on MNP stated that the average diameter is (12.6±0.2) nm determined by Transmission Electron Microscopy where the MNP have the crystalline phase of magnetite (Fe 3 O 4 ) that was identified by Diffraction X-ray and confirmed by Mössbauer Spectroscopy. The blocking temperature of (89±1) K, Fe 3 O 4 MNP property, was determined from magnetic measurements based on the Zero Field Cooled and Field Cooled methods. The hysteresis loops were measured at different temperatures below and above blocking temperature. The magnetometry determined that the MNP showed superparamagnetic behavior confirmed by ferromagnetic resonance.

show abstract

“…The properties of polycrystalline materials depend, among other things, on the crystallite size. In the case of nanoparticles, the crystallite size is associate with the average nanoparticle size [29]. The Scherrer equation [30] was used to determine the average crystalline domain size of the bimetallic nanoparticles using the (111) diffraction peak of the XRD profile, leading to an average size of 8 nm.…”

Section: Resultsmentioning

confidence: 99%

Atomic Surface Segregation and Structural Characterization of PdPt Bimetallic Nanoparticles

Rodríguez-Proenza

Palomares-Báez

Chávez-Rojo

et al. 2018

Preprint

View full text Add to dashboard Cite

Bimetallic nanoparticles are of interest since they lead to many interesting electrical, chemical, catalytic, and optical properties. They are particularly important in the field of catalysis since they show superior catalytic properties than their monometallic counterparts. The structures of bimetallic nanoparticles depend mainly on the synthesis conditions and the miscibility of the two components. In this work, PdPt alloyed-bimetallic nanoparticles (NPs) were synthesized through the polyol method, and characterized using spherical aberration (Cs) corrected scanning transmission electron microscopy (STEM). High-angle annular dark-field (HAADF)-STEM images of bimetallic nanoparticles were obtained. The contrast of images shows that nanoparticles have an alloy structure with an average size of 8.2 nm. Together with the characterization of nanoparticles, a systematic molecular dynamics simulations study, focused on the structural stability and atomic surface segregation trends in 923-atom PdPt alloyed-bimetallic NPs was carried out.

show abstract

Determination of nanoparticle sizes by X-ray diffraction

Cited by 152 publications

References 7 publications

Low Temperature Synthesis of Mixed Phase Titania Nanoparticles with High Yield, its Mechanism and Enhanced Photoactivity

Low Temperature Synthesis of Mixed Phase Titania Nanoparticles with High Yield, its Mechanism and Enhanced Photoactivity

Synthesis and characterization of Fe3O4 nanoparticles with perspectives in biomedical applications

Atomic Surface Segregation and Structural Characterization of PdPt Bimetallic Nanoparticles

Contact Info

Product

Resources

About