Electron Paramagnetic Resonance, Scanning Electron Microscopy with Energy Dispersion X-ray Spectrometry, X-ray Powder Diffraction, and NMR Characterization of Iron-Rich Fired Clays

2005 ◽  
Vol 109 (47) ◽  
pp. 22147-22158 ◽  
Author(s):  
Federica Presciutti ◽  
Donatella Capitani ◽  
Antonio Sgamellotti ◽  
Brunetto Giovanni Brunetti ◽  
Ferdinando Costantino ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electron Paramagnetic Resonance ◽  
Powder Diffraction ◽  
Paramagnetic Resonance ◽  
X Ray ◽  
Nmr Characterization ◽  
Electron Paramagnetic ◽  
Scanning Electron

scholarly journals Sol-Gel Synthesis and Characterization of Nanoparticles

2013 ◽  
Vol 2013 ◽  
pp. 1-8 ◽  
Author(s):  
S. Ramesh
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Electron Paramagnetic Resonance ◽  
Optical Absorption ◽  
Sol Gel ◽  
X Ray Diffraction ◽  
Paramagnetic Resonance ◽  
X Ray ◽  
Electron Paramagnetic ◽  
Scanning Electron

The nanoparticles have been synthesized by sol-gel technique. X-ray diffraction, scanning electron microscopy, optical absorption spectroscopy, and electron paramagnetic resonance spectroscopy were used to characterize the sample. The X-ray diffraction results indicate the formation of nanocrystalline materials in tetragonal lattice with P42/nnm space group. The identical distribution of elements were confirmed by scanning electron microscopy with energy dispersive X-ray spectrometry and X-ray mapping. Electron paramagnetic resonance lineshapes of the samples are obtained at various (13 K, 77 K, and 300 K) temperatures. The isotropic lineshapes of the sample B1 are attributed to dipole-dipole interaction of Ti3+ ions. The incorporation of Al3+ ions into the sample B2–B5 the isotropic nature of the lineshapes are collapsed due to the distraction in crystal field. Optical absorption spectra results reveal the presence of Ag-TiO2 nanoparticles.

Crystallization of Aragonite from Vaterite Precursor during Various Refluxing Times

2015 ◽  
Vol 1119 ◽  
pp. 466-470 ◽  
Author(s):  
Radek Ševčík ◽  
Petra Mácová ◽  
Marta Pérez-Estébanez
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Fourier Transform Infrared Spectroscopy ◽  
Powder Diffraction ◽  
X Ray ◽  
Gradual Transformation ◽  
Scanning Electron

CaCO3 polymorphs are intensively studied due to their importance in the nature and the widespread use in the industry as well. This work is dealing with the crystallization of aragonite from vaterite dispersion during the refluxation at 100°C. The characterization of CaCO3 polymorphs during vaterite transformation was performed with Fourier transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM) and X-ray powder diffraction (XRPD). The influence of the different refluxing times on the aragonite crystallization was discussed. The purest aragonite, 70.7(2) wt.%, was synthetized in the sample refluxed for 60 minutes. Prolonged refluxation strongly affected aragonite crystals with gradual transformation into calcite.

Preparation and Characterization of Magnesium Hydroxide by Hydrothermal Modification

2011 ◽  
Vol 332-334 ◽  
pp. 767-770
Author(s):  
Hai Quan Wang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Powder Diffraction ◽  
Magnesium Hydroxide ◽  
Hydrothermal Process ◽  
X Ray ◽  
Hydrothermal Modification ◽  
Bet Specific Surface Area ◽  
Scanning Electron

Magnesium hydroxide (Mg(OH)2) particles were synthesized and modified via a reaction-hydrothermal process in the present of NaOH. The resultant magnesium hydroxide was characterized by X-ray powder diffraction (XRD), field-emission scanning electron microscopy (SEM) and BET specific surface area. It was found that NaOH played a key role in the morphology and dispersion Mg(OH)2 particles.

Reactions of Aniline with Copper(II) Compounds in Relation to the Formation of Copper-Polyaniline Composites

2012 ◽  
Vol 65 (7) ◽  
pp. 723 ◽  
Author(s):  
Adeline Le Cocq ◽  
Marija R. Gizdavic-Nikolaidis ◽  
Allan J. Easteal ◽  
Graham A. Bowmaker
Keyword(s):  
Electron Microscopy ◽  
Aqueous Solution ◽  
Scanning Electron Microscopy ◽  
Electron Paramagnetic Resonance ◽  
Reaction Products ◽  
Paramagnetic Resonance ◽  
Structure And Morphology ◽  
Polyaniline Composites ◽  
Electron Paramagnetic ◽  
Scanning Electron

Reactions of aniline with copper(ii) sulfate, chloride, or bromide in aqueous solution, yielded copper(ii)-aniline complexes, in contrast to previously reported studies, which claimed the formation of copper-polyaniline composites. The structure and morphology of the powder products were characterized by scanning electron microscopy, Raman and Fourier transform infrared spectroscopy, and elemental analysis. An electron paramagnetic resonance (EPR) study was also carried out on the reaction products, confirming their characterization as copper(ii) compounds. None of the reaction products showed significant conductivity, and none of the copper(ii)/aniline reactions resulted in the formation of polyaniline, contrary to previous claims in the literature.

Hydrothermal Synthesis and Characterization of PbTiO3 Microrods

2010 ◽  
Vol 148-149 ◽  
pp. 903-906
Author(s):  
Lin Lin Yang ◽  
Yong Gang Wang ◽  
Xiao Feng Wang ◽  
Yu Jiang Wang ◽  
Gao Rong Han
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Hydrothermal Synthesis ◽  
Hydrothermal Method ◽  
Powder Diffraction ◽  
Energy Dispersive ◽  
Synthesis And Characterization ◽  
X Ray ◽  
Scanning Electron

PbTiO3 microrods were successfully synthesized via a surfactants-free hydrothermal method. The powders were characterized by X-ray powder diffraction (XRD), scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), and photoluminescent spectra techniques (PL). It was found that the precursor played a key role in the formation of PbTiO3 microrods.

scholarly journals Characterization of a Mahamayuri Vidyarajni Sutra excavated in Lu’an, China

2019 ◽  
Vol 7 (1) ◽  
Author(s):  
Liu Liu ◽  
Decai Gong ◽  
Zhengquan Yao ◽  
Liangjie Xu ◽  
Zhanyun Zhu ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Tang Dynasty ◽  
Optical Microscope ◽  
Lead White ◽  
Scientific Methods ◽  
X Ray ◽  
Micro Raman Spectroscopy ◽  
Scanning Electron

Abstract Historically, sutras played an important role in spreading Buddhist faith and doctrine, and today these remain important records of Buddhist thought and culture. A Mahamayuri Vidyarajni Sutra with polychrome paintings was found inside the cavity on top of the Nanmen Buddhist pagoda, built in the early Tang dynasty (618–627 CE) and located in Anhui Province, China. Textile was found on the preface which is strongly degraded and fragile. Unfortunately, the whole sutra is under severe degradation and is incomplete. Technical analysis based on scientific methods will benefits the conservation of the sutra. Optical microscopy (OM), micro-Raman spectroscopy combined with optical microscope (Raman), scanning electron microscopy in combination with energy dispersive X-ray analysis (SEM–EDS) and Fourier Transform Infrared Spectroscopy (FTIR) were used to characterize the pigment and gilded material, as well as the paper fiber and textile. Pigments such as cinnabar, minium, paratacamite, azurite, lead white were found. Gilded material was identified as gold. A five-heddle warp satin, made of silk, was found as the textile on the preface of the sutra. The sutra’s preface and inner pages were made of paper comprised of bamboo and bark. As a magnificent yet recondite treasure of Buddhism, the sutra was analyzed for a better understanding of the material. A conservation project of the sutra will be scheduled accordingly.

Preliminary Preparation and Characterization Studies of Cellulose from Merbau (Intsia bijuga)

2012 ◽  
Vol 620 ◽  
pp. 314-319
Author(s):  
Nur Amira Mamat Razali ◽  
Fauziah Abdul Aziz ◽  
Saadah Abdul Rahman
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Alkaline Treatment ◽  
Raw Material ◽  
X Ray Diffraction ◽  
X Ray ◽  
Preliminary Preparation ◽  
Characterization Studies ◽  
Scanning Electron

Hardwood is wood from angiosperm trees. The characteristic of hardwood include flowers, endosperm within seeds and the production of fruits that contain the seeds. This paper aims to discuss the preparation and characterization of cellulose obtained from hardwood. The hardwood Merbau (Intsia bijuga) was chosen as raw material in this study. Alkaline treatment and delignification methods were used for the preparation of cellulose. Acid hydrolysis was employed to produce cellulose nanocrystal (CNC). The treated and untreated samples were characterized using x-ray diffraction (XRD) and field emission scanning electron microscopy (FE-SEM). The final product, from both trated and untreated samples were then compared.

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