Influence of the metal concentration on the phytosynthesis of nanoparticles of Iron and Zinc

MRS Advances ◽  
2019 ◽  
Vol 4 (59-60) ◽  
pp. 3207-3213
Author(s):  
José Angel Sanjurjo-García ◽  
Pablo Samuel Schabes-Retchkiman ◽  
Ma. Guadalupe Macedo ◽  
José Luis García-Rivas ◽  
Javier Illescas ◽  
...  
Keyword(s):  
Hexagonal Structure ◽  
Hybrid Nanocomposites ◽  
The Third ◽  
Mgo Support ◽  
Iron And Zinc ◽  
Phytochemical Compounds ◽  
Cubic Structure ◽  
Mgo Nanoparticle ◽  
Zn Nanoparticles ◽  
Main Influence

ABSTRACTIn this work, green nanotechnology has been applied by using phytochemical compounds as reducing agents from the plant extract of Hydrocotyle ranunuculoides through three modifications of the phytosynthesis method to prepare Fe and Zn nanoparticles, in three different concentration of the metallic solution. In the third modification a MgO support was included to avoid the Fe and Zn NP agglomeration. The nanoparticles size was 5±1 nm, and for the Fe NPs, it was determined with a cubic structure a Fe3O4 composition, and Zn nanoparticles were obtained with a hexagonal structure and Zn° composition. In the third method, MgO nanoparticle, the support appears as Mg0 nanoparticles surrounded by Fe0 and Zn0 nanoparticles. According to the three used methods pathways, the main influence is the modification in the method synthesis. Hybrid nanocomposites provide a means in preventing agglomeration of the NPs and hence avoid coalescence and loss of properties.

Topological crystallography of gas hydrates

2015 ◽  
Vol 71 (4) ◽  
pp. 444-450 ◽  
Author(s):  
Sergey V. Gudkovskikh ◽  
Mikhail V. Kirov
Keyword(s):  
Hydrogen Bonding ◽  
Gas Hydrates ◽  
Periodic Boundary ◽  
Periodic Boundary Conditions ◽  
Hexagonal Structure ◽  
New Approach ◽  
Quotient Graphs ◽  
Disordered Structure ◽  
Unit Cells ◽  
Cubic Structure

A new approach to the investigation of the proton-disordered structure of clathrate hydrates is presented. This approach is based on topological crystallography. The quotient graphs were built for the unit cells of the cubic structure I and the hexagonal structure H. This is a very convenient way to represent the topology of a hydrogen-bonding network under periodic boundary conditions. The exact proton configuration statistics for the unit cells of structure I and structure H were obtained using the quotient graphs. In addition, the statistical analysis of the proton transfer along hydrogen-bonded chains was carried out.

scholarly journals Transformations of Phosphorus under Pressure from Simple Cubic to Simple Hexagonal Structures via Incommensurately Modulations: Electronic Origin

Proceedings ◽  
2018 ◽  
Vol 2 (14) ◽  
pp. 1111
Author(s):  
Degtyareva Valentina
Keyword(s):  
Hexagonal Structure ◽  
Complex Phase ◽  
Group V ◽  
Fermi Sphere ◽  
Simple Cubic ◽  
Phosphorus Forms ◽  
Structures And Properties ◽  
Wide Pressure Range ◽  
Cubic Structure ◽  
Wide Pressure

The lighter group-V element phosphorus forms the As-type (hR2) structure under pressure, above 5 GPa, and at 10 GPa transforms to the simple cubic structure (cP1), similar to arsenic. Despite its low packing density, the simple cubic structure is stable in phosphorus over a very wide pressure range up to 103 GPa. On further pressure increase, the simple cubic structure transforms into a simple hexagonal structure (hP1) via a complex phase that was solved recently as incommensurately modulated. Structural transformations of phosphorus are connected with the changes of physical properties. Above 5 GPa phosphorus shows superconductivity with Tc reaching ~9.5 K at 32 GPa. The crystal structures and properties of high-pressure phases for phosphorus are discussed within the model of the Fermi sphere and Brillouin zone interactions.

Why is the cubic structure preferred in newly formed ice?

2019 ◽  
Vol 21 (33) ◽  
pp. 18043-18047 ◽  
Author(s):  
Joanna Grabowska
Keyword(s):  
Liquid Water ◽  
Hexagonal Structure ◽  
Cubic Structure ◽  
Structure Of Liquid

The structure of liquid water promotes the formation of ice in which the content of the cubic structure is higher than the content of the hexagonal structure.

Synthesis and Optical Properties of Sb-Doped CdS Photocatalysts and Their Use in Methylene Blue (MB) Degradation

2017 ◽  
Vol 15 (2) ◽  
Author(s):  
Irem Firtina Ertis ◽  
Ismail Boz
Keyword(s):  
Methylene Blue ◽  
Photocatalytic Degradation ◽  
Hydrothermal Method ◽  
Irradiation Time ◽  
Chemical Precipitation ◽  
Hexagonal Structure ◽  
Mercury Lamp ◽  
Uv Visible ◽  
Cubic Structure ◽  
Visible Reflectance

Abstract Sb-CdS catalysts with good crystalline structure were prepared by chemical precipitation and hydrothermal method. The results showed that hydrothermal treatment is an effective method to prepare CdS based catalysts of hexagonal structure. Single Sb2S3 catalyst has spherical and Sb doped CdS catalysts have hexagonal structure. Sb doped CdS which is prepared by Na2S with chemical precipitation, has cubic structure. The band gap energies of Sb doped CdS photocatalysts were estimated using UV-visible reflectance spectra to be about the range of 2.35–2.57 eV. In particular, the photoluminescence (PL) spectra show enhancing emission peaks that strongly decrease with a doping Sb where the catalyst was prepared with ethylenediamine (EDA) and thioacetamide (TAA), has shown the lowest luminescence intensity. Photocatalytic degradation of methylene blue was carried out using Sb doped and Sb2S3-CdS binary catalysts under a 400 W medium-pressure mercury lamp of visible light irradiation (λ>420 nm). Higher photocatalytic degradation was achieved by adding Sb to CdS catalyst with using hydrothermal method and EDA as coordinating agent compare with the other catalysts. In this case the photocatalytic degradation of the Sb-CdS-EDA-TAA photocatalyst after 4 h irradiation time was about 84 %.

scholarly journals KARAKTERISASI ABU KAYU MERBAU (Intsia, spp.): PENGARUH TEMPERATUR DAN LAMA KALSINASI

2019 ◽  
Vol 15 (1) ◽  
pp. 30-38
Author(s):  
Darma Santi ◽  
Jacson Victor Morin
Keyword(s):  
Calcination Temperature ◽  
Wood Ash ◽  
Hexagonal Structure ◽  
Rhombohedral Structure ◽  
Water Molecules ◽  
X Ray Diffraction ◽  
X Ray ◽  
Ft Ir ◽  
Cubic Structure

Characterization of merbau wood ash (Intsia, spp.) due to the influence of temperature and time of calcination has been studied. The variations in calcination temperature were 500 ᴼC (as M500) and 600 ᴼC (as M600), while the variations in the duration of calcination were 1, 2, and 3 hours, noted as M1, M2, and M3, respectively. Characterization was carried out using X-ray diffraction (XRD) and spectroscopic analysis using FT-IR. XRD results identified the presence of CaCO3 species (rhombohedral structure) and K2Si4O9 species with a hexagonal structure on M500. The M600 species identified Si (cubic structure), SiO2 (cubic structure), K2Si4O9 (hexagonal structure), and CaCO3 (rhombohedral structure). In general, the calcination temperature increases the crystallinity of several compounds contained in merbau wood ash. The length of time calcination reduces the absorption peak due to the decomposition and adsorption reactions of the presence of water molecules bound to the ash material of merbau wood (Intsia, spp).

Research on the Microstructure of Solid FeS by TEM

2011 ◽  
Vol 217-218 ◽  
pp. 1098-1101
Author(s):  
Li Na Zhu ◽  
Cheng Biao Wang ◽  
Hai Dou Wang ◽  
Bin Shi Xu ◽  
Jia Jun Liu ◽  
...  
Keyword(s):  
Electron Microscope ◽  
Electron Diffraction ◽  
Transmission Electron Microscope ◽  
Solid Lubricant ◽  
Hexagonal Structure ◽  
Face Centered Cubic ◽  
Transmission Electron ◽  
Different Shapes ◽  
Cubic Structure ◽  
Face Centered

The microstructures of three kinds of synthetical solid FeS, acting as a solid lubricant, which includes FeS bulk, FeS particle and FeS powder, were studied by transmission electron microscope (TEM) in this article. The TEM photographs showed that different shapes of FeS had quite dissimilar characteristics. The texture of FeS powder was the loosest among the three shapes, and it tended to forming flocculent aggregation; while FeS bulk and FeS particle were more dispersive. The electron diffraction results showed that the crystals of solid FeS were composed of many single crystals and multi-crystals, with two kinds of crystalline structure- hexagonal structure and face-centered cubic structure.

Living biomembrane bitemplate route for simultaneous synthesis of different morphologies of CdSe and ZnSe nanomaterials

2006 ◽  
Vol 84 (5) ◽  
pp. 782-787 ◽  
Author(s):  
Li Li ◽  
Qing-Sheng Wu ◽  
Ya-Ping Ding
Keyword(s):  
Formation Mechanism ◽  
Room Temperature ◽  
Hexagonal Structure ◽  
Lattice Constants ◽  
Biomineralization Process ◽  
Cubic Structure ◽  
Simultaneous Synthesis ◽  
Xrd Patterns

In this paper, CdSe (nanotubes, nanorods) and ZnSe (nanorods, nanoslats) were simultaneously synthesized through a biomineralization process through biomembrane bitemplates of mungbean sprouts at room temperature. The XRD patterns indicated that these nanocrystals were crystallized in the hexagonal structure and cubic structure with lattice constants a = 0.423 and c = 0.701 nm (CdSe) and a = 0.567 nm (ZnSe), respectively. The possible formation mechanism was investigated in the paper.Key words: CdSe, ZnSe, nanotubes, nanorods, nanoslats, living biomembrane, bitemplates.

Transmission Electron Microscopy Observations on the Precipitates in Al-Zn-Mg Based Sacrificial Anode Alloy

2011 ◽  
Vol 704-705 ◽  
pp. 989-992
Author(s):  
Jing Ling Ma ◽  
Jiu Ba Wen ◽  
Quan An Li ◽  
Jun Feng Li
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Cast Alloy ◽  
Hexagonal Structure ◽  
Sacrificial Anode ◽  
Orthorhombic Structure ◽  
Selective Area ◽  
Transmission Electron ◽  
Cubic Structure ◽  
Selective Area Electron Diffraction

nanoscale precipitates in the Al-Zn-In-Mg-Ti-Mn alloy were investigated by regular and high resolution transmission electron microscopy (TEM and HRTEM) and by selective area electron diffraction (SAED). The cast alloy contains the hexagonal structure MgZn2 and the orthorhombic structure Al6Mn precipitates, but after aged the precipitates of the cubic structure Mg2Zn11 were found. The Mg2Zn11 precipitates can act as activation centre, make the alloy pitting. But the activation of Al6Mn precipitates is very little.

A Comparative Study of CdS Thin Films Grown by Chemical-Bath Deposition and Close-Spaced Sublimation

2001 ◽  
Vol 668 ◽  
Author(s):  
H.R. Moutinho ◽  
D. Albin ◽  
Y. Yan ◽  
R.G. Dhere ◽  
C. Perkins ◽  
...  
Keyword(s):  
Thin Films ◽  
Borosilicate Glass ◽  
Hexagonal Structure ◽  
Silicon Substrates ◽  
Planar Defects ◽  
Main Effect ◽  
Before And After ◽  
Conformal Coverage ◽  
Cds Thin Films ◽  
Cubic Structure

ABSTRACTIn this work we study the properties of cadmium sulfide thin films grown by chemicalbath deposition and close-spaced sublimation, on SnO2/borosilicate glass and SnO2/silicon substrates, before and after treatment in vapor CdCl2 at 400°C for 5 minutes. The as-deposited CBD CdS films had cubic structure, poor crystallinity, and high density of planar defects. After the CdCl2 treatment, these films recrystallized to the hexagonal structure, with improved crystallinity and a decrease in the density of planar defects. The as-deposited CSS films had hexagonal structure, better crystallinity, and lower density of planar defects. The main effect of the CdCl2 treatment was a decrease in the intragrain strain in the films. The CBD films had smaller grains and provided a good conformal coverage over the SnO2 films. In contrast to these films, CSS CdS did not have any oxygen or chlorine in its bulk.

Systematics of Silicide Formation by High Dose Miplantation of Transition Metals into Si

1986 ◽  
Vol 74 ◽  
Author(s):  
F. Namavar ◽  
F. H. Sanchez ◽  
J. I. Budnick ◽  
A. H. Fasihuddin ◽  
H. C. Hayden
Keyword(s):  
Room Temperature ◽  
Hexagonal Structure ◽  
High Dose ◽  
List Type ◽  
Type Number ◽  
Silicide Formation ◽  
Metal Thin Films ◽  
X Ray ◽  
Cubic Structure ◽  
Fe Implantation

AbstractWe have systematically studied the formation of transition-metal thin films by high dose (up to 1018 ions/cm2) implantation of Ti, V, Cr, Mn, Fe, Co, Ni and Nb at room temperature and 350°C into Si <100>.For implantation at 350°C, our results, as obtained by Rutherford backscattering, X-ray diffractometry and Read Camera measurements, indicate that one can categorize these metals into two groups: 1.a chromium group which includes V, Cr, Nb, Ti and Mn. Metals V, Cr and Nb form compounds (VSi2, CrSi2. NbSi2) with a hexagonal structure of the CrSi2 type whereas Ti and Mn both form compounds (Ti5Si3, Mn5Si3) with a hexagonal structure of the Mn5Si2 type.2.an iron group which includes Fe, Co and Ni. These metals form compounds (FeSi, CoSi, NiSi) with a cubic structure of the FeSi type.In this paper the experimental results for Cr and Fe implantation at room temperature and 350°C will be discussed.

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