scholarly journals Microwave Assisted Phytosynthesis and Characterization of Magnetic Iron Oxide Quantum Dots using Moringa oleifera

2018 ◽  
Vol 15 (2) ◽  
pp. 145-150 ◽  
Author(s):  
G. Deepthi Reddy ◽  
M. Noorjahan ◽  
K.Girija Mangatayaru ◽  
M. Krishnakanth
Keyword(s):  
Quantum Dots ◽  
Iron Oxide ◽  
Moringa Oleifera ◽  
Structural Characteristics ◽  
Aqueous Media ◽  
Diffraction Method ◽  
Visible Spectrum ◽  
X Ray Diffraction ◽  
X Ray ◽  
Magnetic Iron Oxide

Magnetic Iron Oxide Quantum Dots (MIOQDs) were synthesized using Moringa oleifera leaves through green technique i.e., Microwave treatment. The synthetic method is highly rapid, simple and economical. MIOQDs were formed by reduction of ferric chloride (FeCl3) solution with Moringa oleifera leaf extract without any influence of alkaline conditions which opens a new arena for the phytosynthesis of nanoparticles. MIOQDs structural characteristics were scrutinized by Powder X-ray diffraction method, FESEM, TEM, UV –Visible Spectroscopy, Photoluminescence Emission Spectroscopy. The ultraviolet-visible spectrum recorded for the aqueous media iron nanoparticles showed an absorption peak at around 330 nm. Powder X-ray diffraction showed that the particles are crystalline in nature, with both hematite and maghemite structure.

Characterizations of Mg Implanted GaN

1997 ◽  
Vol 482 ◽  
Author(s):  
Gou-Chung Chi ◽  
B. J. Pong ◽  
C. J. Pan ◽  
Y. C. Teng ◽  
C. H. Lee
Keyword(s):  
Small Angle ◽  
Lattice Strain ◽  
Structural Characteristics ◽  
Diffraction Method ◽  
Diffraction Peak ◽  
X Ray Diffraction ◽  
Green Band ◽  
Structure Defects ◽  
X Ray ◽  
Shoulder Peak

AbstractWith 150KeV Mg+ ion implantation, the optical and structural characteristics of GaN films were studied. Post-implant annealing up to 1000°C was performed in N2 ambient with a rapid thermal annealing (RTA) system, without an encapsulation layer. We observed a green band photoluminescence from Mg-implanted GaN. This green band photoluminescence should be associated with Mg induced defect-clustering in GaN. We also use the x-ray diffraction method to study the correlation between structure defects and implantation. We observed an extra shoulder peak at the small angle side of the GaN[0004] diffraction peak. The origin of this shoulder may be attributed to implanted magnesium induced GaN lattice strain.

scholarly journals X-RAY DIFFRACTION METHOD FOR DETERMINATION OF SIZES AND STRUCTURAL CHARACTERISTICS OF NANOGRAPHITES IN ACTIVATED CARBON MATERIALS

2018 ◽  
Vol 59 (9) ◽  
pp. 62
Author(s):  
Nikita S. Saenko ◽  
Albert M. Ziatdinov
Keyword(s):  
Activated Carbon ◽  
Carbon Fibers ◽  
Structural Characteristics ◽  
Diffraction Method ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Scattering ◽  
Nanocrystalline Graphite ◽  
Ray Scattering

The method for determination of sizes and structural characteristics of nanographites in activated carbon fibers (ACFs) by analyzing their experimental X-ray diffraction profiles has been developed in the paper. It uses the curves of X‑ray scattering calculated for the set of nanographites consisting of benzene- and phenalene-bazed nanographenes of various sizes, which interatomic and interlayer distances depend on the number of atoms in layer. The developed method can be also applied to analysis of the X-ray diffraction profiles of other nanocrystalline graphite structures. The data acquired by the method agree with results of Raman spectroscopy and small-angle X-ray scattering on ACFs structure motives.

Structural Properties of 300 Å of Iron Films Grown on Polycrystalline Substrate

2019 ◽  
Vol 397 ◽  
pp. 69-75
Author(s):  
Radhia Boukhalfa ◽  
Hichem Farh
Keyword(s):  
Structural Properties ◽  
Room Temperature ◽  
Molecular Beam ◽  
Structural Characteristics ◽  
Diffraction Method ◽  
The Other ◽  
X Ray Diffraction ◽  
Iron Films ◽  
X Ray ◽  
Polycrystalline Substrate

In this manuscript, the structural properties such as the distance inter-reticular of samples is studied, In the fact, four samples were used symbolized as follows: E tAg(Å), the only difference is the thickness of the Silver buffer layer (tAg= 0, 50, 100 and 150 Å) to find out how the thickness of this layer depends on the structural characteristics of the Iron thin layer, all samples are deposited using molecular beam epitaxy (MBE) at room temperature onto Si (100) substrate. The structural properties of all samples examined using X-ray diffraction method at small and high angles. The small angles X-Ray diffraction curves confirmed to us that there is a clear difference between the surface structure of the samples by varying the number of Kiessig Fringes, Also high angles X-Ray diffraction curves assured us this difference through the clear variation in the angular positions of the peaks of Bragg and the distances inter-reticular values from a sample to the other.

Maghemite in soils and its origin

Clay Minerals ◽  
1974 ◽  
Vol 10 (4) ◽  
pp. 289-298 ◽  
Author(s):  
R. M. Taylor ◽  
U. Schwertmann
Keyword(s):  
Iron Oxide ◽  
Oxalic Acid ◽  
Diffraction Pattern ◽  
Magnetic Phase ◽  
X Ray Diffraction ◽  
X Ray ◽  
Magnetic Iron Oxide

AbstractA magnetic iron oxide is a common constituent of ferruginous concretions in highly weathered Australian soils and is generally associated with varying proportions of hematite and occasionally with goethite. The X-ray diffraction pattern and the low Fe (11) contents (4-15% of total Fe) of this magnetic phase identify it as maghemite which was further confirmed by IR and DTA. This maghemite is only slightly soluble in dithionite but readily in 1:1 HCl or oxalic acid. From the Fe (11) contents and mineralogical associations in soil concretions, conditions for maghemite formation under near pedogenic conditions are suggested.

scholarly journals Morphology and Structural Properties of Undoped and Cobalt Doped Magnetic Iron Oxide Particles for Improving the Environmental Quality

2020 ◽  
Vol 9 (6) ◽  
pp. 18-21 ◽  
Keyword(s):  
Iron Oxide ◽  
Structural Properties ◽  
Industrial Applications ◽  
X Ray Diffraction ◽  
Iron Oxide Particles ◽  
Natural Sand ◽  
X Ray ◽  
Magnetic Iron Oxide ◽  
Milling Method ◽  
Oxide Particles

Doping of metal ions in magnetic iron oxide particles can improve its performance and lead to its new technological and industrial applications. Magnetic iron oxide particles of undoped and cobalt doped were synthesized from natural sand of Logas District Kuansing Regency by ball milling method. The structural properties and the morphology of the magnetic iron oxide F e2O3 particles were analyzed using X-Ray Diffractometer (XRD) and scanning electron microscope (SEM). The X-ray diffractometric study showed that X-ray diffraction (XRD) peaks shift to slightly higher angles as compared to those of undoped magnetic iron oxide particles. This shift is due to relatively smaller ionic radius of cobalt as compared to those for iron. Moreover, peaks corresponding to cobalt oxide or metal cobalt could not be observed in the diffraction pattern. Some other diffraction peaks from other crystalline forms such as silicon (Si) and titanium (Ti) were observed.

Preparation of Magnetic Iron Oxide by Hydrothermal Method

2014 ◽  
Vol 904 ◽  
pp. 107-110
Author(s):  
Fu Yan Zhao ◽  
Ya Ling Li ◽  
Chao Lv ◽  
Lu Hai Li
Keyword(s):  
Crystal Structure ◽  
Thermal Analysis ◽  
Iron Oxide ◽  
Hydrothermal Method ◽  
X Ray Diffraction ◽  
Iron Oxide Particles ◽  
X Ray ◽  
Magnetic Iron Oxide ◽  
Oxide Particles ◽  
Different Shapes

Abstract. Iron oxide particles with spherical, date-pit like, or polyhedron morphology were obtained by hydrothermal method. The morphology, thermal analysis, crystal structure of the products was characterized by FESEM, thermogravimetry (TG), X-ray diffraction (XRD), respectively. The measured results reveal that the product of three different shapes is hematite (α-Fe2O3).

A low cost synthesis method for functionalised iron oxide nanoparticles for magnetic hyperthermia from readily available materials

2014 ◽  
Vol 175 ◽  
pp. 83-95 ◽  
Author(s):  
Joseph C. Bear ◽  
Bin Yu ◽  
Cristina Blanco-Andujar ◽  
Paul D. McNaughter ◽  
Paul Southern ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Photoelectron Spectroscopy ◽  
Low Cost ◽  
Aqueous Media ◽  
Synthesis Method ◽  
Magnetic Hyperthermia ◽  
X Ray Diffraction ◽  
X Ray ◽  
High Street ◽  
Fatty Acid Precursor

The synthesis of iron oxide nanocrystals from reagents taken from high street sources using thermal decomposition of an iron–fatty acid precursor in a high boiling point solvent in the presence of surfactants is presented. The nanocrystals were characterised using a variety of techniques including: electron microscopy, X-ray dispersive spectroscopy, infrared spectroscopy, X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and magnetometry. Thermogravimetric analysis (TGA) is also used to compare the decomposition behaviour of iron oleate and iron palmitate, our nanoparticle precursors. The nanoparticles also exhibit shape anisotropy when prepared under optimum conditions. We show that these nanoparticles have potential in magnetic hyperthermia after transfer to aqueous media via an amphiphilic polymer.

A High Resolution Study of G.P. Zones in Aluminum - 4.2 at % Silver

1982 ◽  
Vol 40 ◽  
pp. 722-723 ◽  
Author(s):  
R. Gronsky
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
High Resolution ◽  
Computer Simulations ◽  
Structural Characteristics ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Resolution Study

The phenomenon of clustering in Al-Ag alloys has been extensively studied since the early work of Guinierl, wherein the pre-precipitation state was characterized as an assembly of spherical, ordered, silver-rich G.P. zones. Subsequent x-ray and TEM investigations yielded results in general agreement with this model. However, serious discrepancies were later revealed by the detailed x-ray diffraction - based computer simulations of Gragg and Cohen, i.e., the silver-rich clusters were instead octahedral in shape and fully disordered, atleast below 170°C. The object of the present investigation is to examine directly the structural characteristics of G.P. zones in Al-Ag by high resolution transmission electron microscopy.

Self-Recognizing π-π Stacking Interactions Designed for the Generation of Ultrastable Mesoporous Hydrogen-Bonded Organic Frameworks

2019 ◽  
Author(s):  
KAIKAI MA ◽  
Peng Li ◽  
John Xin ◽  
Yongwei Chen ◽  
Zhijie Chen ◽  
...  
Keyword(s):  
Pore Size ◽  
Fiber Composite ◽  
Aqueous Media ◽  
Stacking Interactions ◽  
Mustard Gas ◽  
X Ray Diffraction ◽  
X Ray ◽  
Expansion Strategy ◽  
Π Stacking ◽  
Hydrogen Bonded

Creating crystalline porous materials with large pores is typically challenging due to undesired interpen-etration, staggered stacking, or weakened framework stability. Here, we report a pore size expansion strategy by self-recognizing π-π stacking interactions in a series of two-dimensional (2D) hydrogen–bonded organic frameworks (HOFs), HOF-10x (x=0,1,2), self-assembled from pyrene-based tectons with systematic elongation of π-conjugated molecular arms. This strategy successfully avoids interpene-tration or staggered stacking and expands the pore size of HOF materials to access mesoporous HOF-102, which features a surface area of ~ 2,500 m2/g and the largest pore volume (1.3 cm3/g) to date among all reported HOFs. More importantly, HOF-102 shows significantly enhanced thermal and chemical stability as evidenced by powder x-ray diffraction and N2 isotherms after treatments in chal-lenging conditions. Such stability enables the adsorption of dyes and cytochrome c from aqueous media by HOF-102 and affords a processible HOF-102/fiber composite for the efficient photochemical detox-ification of a mustard gas simulant.

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