ChemInform Abstract: MOLECULAR RECEPTORS. SYNTHESIS, X-RAY CRYSTAL STRUCTURES, AND CHEMICAL PROPERTIES OF CROWN ETHERS BEARING AN INTRAANNULAR PHENOLIC GROUP

ABSTRACTThe physical and chemical properties of fly ash produced at Ottumwa Generating Station have been monitored since April, 1985. The fly ash is produced from burning a low sulfur, sub-bituminous coal obtained from the Powder River Basin near Gillette, Wyoming. One-hundred and sixty samples of fly ash were obtained during the two year period. All of the samples were subjected to physical testing as specified by ASTM C 311. About one-hundred of the samples were also subjected to a series of tests designed to monitor the self-cementing properties of the fly ash. Many of the fly ash samples were subjected to x-ray diffraction and fluorescence analysis to define the mineralogical and chemical composition of the bulk fly ash as a function of sampling date. Hydration products in selected hardened fly ash pastes, were studied by x-ray diffraction and scanning electron microscopy. The studies indicated that power plant operating conditions influenced the compressive strength of the fly ash paste specimens. Mineralogical and morphological studies of the fly ash pastes indicated that stratlingite formation occurred in the highstrength specimens, while ettringite was the major hydration product evident in the low-strength specimens.

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PHYSICAL AND CHEMICAL STUDIES OF OVERROOF ROCKS OF CLAY SHALES OF THE DZHERDANAK DEPOSIT

CHEMISTRY AND CHEMICAL ENGINEERING ◽

10.51348/ubco8703 ◽

2021 ◽

pp. 16-21

Keyword(s):

Electron Microscopy ◽

Fine Structure ◽

Chemical Properties ◽

Mineralogical Composition ◽

Physical And Chemical Properties ◽

X Ray ◽

Clay Shales ◽

Chemical Studies ◽

Physical And Chemical ◽

And Chemical Properties

The purpose of this study is study of the physical and chemical properties of the overburden of the Dzherdanak deposit. The chemical and mineralogical composition of the overburden of the Djerdanak deposit has been studied by the methods of X-ray and thermography, electron microscopy and infrared spectroscopy. The main phases are quartz, kaolinite and muscovite. The study of the fine structure of the rock under an electron microscope showed the homogeneity of the rock with pronounced uniform inclusions, which is preserved even after firing. Changes in the rock after firing at 1050 °C have been determined. The formation of mullite at this temperature has been established.

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MEASUREMENT METHODS | Electronic and Chemical Properties: X-Ray Photoelectron Spectroscopy

Encyclopedia of Electrochemical Power Sources ◽

10.1016/b978-044452745-5.00075-7 ◽

2009 ◽

pp. 673-695 ◽

Cited By ~ 4

Author(s):

D. Tonti ◽

R. Zanoni

Keyword(s):

Photoelectron Spectroscopy ◽

Chemical Properties ◽

Measurement Methods ◽

X Ray ◽

And Chemical Properties

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Fracture analysis and countermeasures of the grid switch castings

E3S Web of Conferences ◽

10.1051/e3sconf/202016506015 ◽

2020 ◽

Vol 165 ◽

pp. 06015

Author(s):

Chao Feng ◽

Siyuan Yang ◽

Qiao Li ◽

Mengbao Zhou ◽

Songqi Wu ◽

...

Keyword(s):

Chemical Properties ◽

Fracture Analysis ◽

Casting Defects ◽

Physical And Chemical Properties ◽

Direct Reading ◽

X Ray ◽

Detection Technology ◽

Two Stages ◽

Physical And Chemical ◽

And Chemical Properties

Based on the detection technology of direct reading spectrum, metallographic microscope and X-ray, the defects of the grid switch castings were analyzed. The four main forms of casting fracture were summarized as poor physical and chemical properties, material misuse, casting defects and designing defects. In order to strengthen the quality control of the source of the product, it was proposed to carry out targeted network inspection in the two stages of material arrival and infrastructure acceptance.

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Characterization of Shivirtui Zeolite Modified with Aluminum Oxyhydroxide Nanofibers

Materials Science Forum ◽

10.4028/www.scientific.net/msf.942.40 ◽

2019 ◽

Vol 942 ◽

pp. 40-49

Author(s):

Yulia Murashkina ◽

Olga B. Nazarenko

Keyword(s):

Chemical Properties ◽

Nitrogen Adsorption ◽

X Ray Diffraction ◽

Scanning Electronic Microscopy ◽

Electronic Microscopy ◽

X Ray ◽

Physical And Chemical ◽

And Chemical Properties ◽

Aluminum Oxyhydroxide

Natural zeolite of Shivirtui deposit (Russia) was modified with nanofibers of aluminum oxyhydroxide AlOOH. Aluminum oxyhydroxide nanofibers were produced at the heating and oxidation of aluminum powder with water. The properties of modified zeolite were investigated by means of X-ray diffraction, transmission electronic microscopy, scanning electronic microscopy, low-temperature nitrogen adsorption, thermal analysis, and Fourier transform infrared spectroscopy. It was found that water content in the modified sample of zeolite was about 15 %. Based on the study of the physical and chemical properties, shivirtui zeolite modified with nanofibers of aluminum oxyhydroxide can be proposed for use as a flame-retardant additive to polymers.

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Study of Band Gap of Silver Nanoparticles—Titanium Dioxide Nanocomposites

Journal of Chemistry ◽

10.1155/2014/589707 ◽

2014 ◽

Vol 2014 ◽

pp. 1-6 ◽

Cited By ~ 11

Author(s):

P. Barone ◽

F. Stranges ◽

M. Barberio ◽

D. Renzelli ◽

A. Bonanno ◽

...

Keyword(s):

Silver Nanoparticles ◽

Band Gap ◽

Chemical Properties ◽

Photoelectrochemical Cells ◽

Visible Range ◽

X Ray ◽

Optical Absorbance ◽

Laser Ablation Process ◽

Uv Visible ◽

And Chemical Properties

The optical and chemical properties of Ag/TiO2nanocomposites were investigated to explore the possibilities of incorporating these new materials in Gratzel photoelectrochemical cells. The nanocomposites were obtained doping TiO2, in both allotropic species anatase and rutile, with silver nanoparticles (grown by laser ablation process). X-ray photoelectron data indicate the absence of Ag-Ti chemical bonds, while measurements of photoluminescence and optical absorbance in UV-visible range show a quench in photoluminescence emission of about 50% and an increase in visible absorbance of about 20%. Measurements of optical band gap, obtained by Tauc’s equation, indicate a variation of about 1.6 eV.

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