Impact of Tb 3+ ion concentration on the morphology, structure and photoluminescence of Gd 2 O 2 SO 4 :Tb 3+ phosphor obtained using thermal decomposition of sulfate hydrate

Luminescence ◽  
2020 ◽  
Vol 35 (8) ◽  
pp. 1254-1263
Author(s):  
R.V. Rodrigues ◽  
Ł. Marciniak ◽  
L.U. Khan ◽  
E.J.B. Muri ◽  
P.C.M. Cruz ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Ion Concentration ◽  
Sulfate Hydrate

Thermal decomposition of zinc hydroxy-sulfate-hydrate minerals

2016 ◽  
Vol 125 (1) ◽  
pp. 85-96 ◽  
Author(s):  
Tsveta Staminirova ◽  
Nadia Petrova ◽  
Georgi Kirov
Keyword(s):  
Thermal Decomposition ◽  
Sulfate Hydrate

Luminescence investigation of Dy2O2S and Dy2O2SO4 obtained by thermal decomposition of sulfate hydrate

2016 ◽  
Vol 34 (8) ◽  
pp. 814-819 ◽  
Author(s):  
R.V. Rodrigues ◽  
L. Marciniak ◽  
L.U. Khan ◽  
J.R. Matos ◽  
H.F. Brito ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Sulfate Hydrate ◽  
Luminescence Investigation

Study on Thermogravimetric and Differential Thermal Characteristics of Aluminum Salt Flame Retardants

2014 ◽  
Vol 556-562 ◽  
pp. 322-325 ◽  
Author(s):  
Xu Zhang ◽  
Dan Li ◽  
Hua Xie ◽  
Zhi Liang Zhang
Keyword(s):  
Thermal Analysis ◽  
Thermal Decomposition ◽  
Flame Retardants ◽  
Chemical Method ◽  
Inorganic Salt ◽  
Thermal Characteristics ◽  
Ammonia Concentration ◽  
Ion Concentration ◽  
Aluminum Salt ◽  
Reaction Conditions

Aluminum salt flame retardants have been synthesized by the chemical method under different reaction conditions. And then, the influence of the reaction temperature, ammonia concentration, aluminum ion concentration and addition on the thermal decomposition characteristics of aluminum salt flame retardants is analyzed and discussed on the basis of the experimental results obtained by using thermogravimetric and differential thermal analysis. Seeding experiments with the current work may have significant potential towards the exploration and development of inorganic salt flame retardants with good thermal decomposition performance.

Applications of Photoelectron Microscopy

1976 ◽  
Vol 34 ◽  
pp. 506-507
Author(s):  
William J. Baxter
Keyword(s):  
Electron Microscopy ◽  
Thermal Decomposition ◽  
Chemical Composition ◽  
Ultraviolet Radiation ◽  
Thin Layer ◽  
Edge Effects ◽  
Electron Optics ◽  
Surface Layers ◽  
Crystalline Orientation ◽  
Fluorescent Screen

In this form of electron microscopy, photoelectrons emitted from a metal by ultraviolet radiation are accelerated and imaged onto a fluorescent screen by conventional electron optics. image contrast is determined by spatial variations in the intensity of the photoemission. The dominant source of contrast is due to changes in the photoelectric work function, between surfaces of different crystalline orientation, or different chemical composition. Topographical variations produce a relatively weak contrast due to shadowing and edge effects.Since the photoelectrons originate from the surface layers (e.g. ∼5-10 nm for metals), photoelectron microscopy is surface sensitive. Thus to see the microstructure of a metal the thin layer (∼3 nm) of surface oxide must be removed, either by ion bombardment or by thermal decomposition in the vacuum of the microscope.

Preparation and characterisation of vanadium pentoxide supported rhodium catalyst

1988 ◽  
Vol 46 ◽  
pp. 946-947
Author(s):  
A. Legrouri
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Vanadium Pentoxide ◽  
High Purity ◽  
Gas Adsorption ◽  
Rhodium Catalyst ◽  
Optical Methods ◽  
Reducible Oxides

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.

Observations of the Thermal Decomposition of Brucite

1968 ◽  
Vol 26 ◽  
pp. 446-447
Author(s):  
P. L. Burnett ◽  
W. R. Mitchell ◽  
C. L. Houck
Keyword(s):  
Thermal Decomposition ◽  
Magnesium Oxide ◽  
Basal Plane ◽  
Magnesium Ions ◽  
A Value ◽  
Reaction Proceeds

Natural Brucite (Mg(OH)2) decomposes on heating to form magnesium oxide (MgO) having its cubic ﹛110﹜ and ﹛111﹜ planes respectively parallel to the prism and basal planes of the hexagonal brucite lattice. Although the crystal-lographic relation between the parent brucite crystal and the resulting mag-nesium oxide crystallites is well known, the exact mechanism by which the reaction proceeds is still a matter of controversy. Goodman described the decomposition as an initial shrinkage in the brucite basal plane allowing magnesium ions to shift their original sites to the required magnesium oxide positions followed by a collapse of the planes along the original <0001> direction of the brucite crystal. He noted that the (110) diffraction spots of brucite immediately shifted to the positions required for the (220) reflections of magnesium oxide. Gordon observed separate diffraction spots for the (110) brucite and (220) magnesium oxide planes. The positions of the (110) and (100) brucite never changed but only diminished in intensity while the (220) planes of magnesium shifted from a value larger than the listed ASTM d spacing to the predicted value as the decomposition progressed.

Ratio imaging of intracellular ion concentration

1992 ◽  
Vol 50 (2) ◽  
pp. 1160-1161
Author(s):  
Stephen R. Bolsover
Keyword(s):  
Individual Cell ◽  
Video Camera ◽  
Field Of View ◽  
Ion Concentration ◽  
Fluorescence Signal ◽  
Ion Imaging ◽  
Ratiometric Fluorescence ◽  
Ratio Imaging ◽  
The Mean ◽  
The Many

The field of intracellular ion concentration measurement expanded greatly in the 1980's due primarily to the development by Roger Tsien of ratiometric fluorescence dyes. These dyes have many applications, and in particular they make possible to image ion concentrations: to produce maps of the ion concentration within living cells. Ion imagers comprise a fluorescence microscope, an imaging light detector such as a video camera, and a computer system to process the fluorescence signal and display the map of ion concentration.Ion imaging can be used for two distinct purposes. In the first, the imager looks at a field of cells, measuring the mean ion concentration in each cell of the many in the field of view. One can then, for instance, challenge the cells with an agonist and examine the response of each individual cell. Ion imagers are not necessary for this sort of experiment: one can instead use a system that measures the mean ion concentration in a just one cell at any one time. However, they are very much more convenient.

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