Influence of Fuel in the Synthesis of ZnAl2O4 Catalytic Supports by Combustion Reaction

The aim of this work is to evaluate the influence of fuel in the synthesis of ZnAl2O4 catalytic supports by combustion reaction. For this, it was used the fuels: urea, carbohidrazide, glycine and aniline. The total amount of reagents was calculated according to the theory of propellants and explosive using urea in the stoichiometric proportion (Φe = 1). The structural and morphological characteristics of the powders were evaluated by XRD, FTIR, TEM, SEM and particle size distribution. The results from XRD showed the formation of the normal cubic spinel structure. The powders presented nanosized particles with narrow agglomerates size distribution. The powders prepared with urea showed better value of surface area and smaller crystallite size.

Download Full-text

Chalk dustfall during classroom teaching: particle size distribution and morphological characteristics

Environmental Monitoring and Assessment ◽

10.1007/s10661-008-0164-2 ◽

2008 ◽

Vol 148 (1-4) ◽

pp. 343-351 ◽

Cited By ~ 22

Author(s):

Deepanjan Majumdar ◽

S. P. M. Prince William

Keyword(s):

Particle Size ◽

Particle Size Distribution ◽

Size Distribution ◽

Morphological Characteristics ◽

Classroom Teaching

Download Full-text

Influence of the External Heating Type in the Morphological and Structural Characteristics of Alumina Powder Prepared by Combustion Reaction

Materials Science Forum ◽

10.4028/www.scientific.net/msf.660-661.58 ◽

2010 ◽

Vol 660-661 ◽

pp. 58-62 ◽

Cited By ~ 8

Author(s):

V.V. Cordeiro ◽

Normanda Lino de Freitas ◽

Kaline Melo de Souto Viana ◽

G. Dias ◽

Ana Cristina Figueiredo de Melo Costa ◽

...

Keyword(s):

Particle Size ◽

Size Distribution ◽

Structural Characteristics ◽

Morphological Characteristics ◽

Nitrogen Adsorption ◽

Combustion Reaction ◽

Alumina Powder ◽

Ceramic Plate ◽

External Heating ◽

Plate Shape

The aim of this work is to evaluate the influence of the external heating in the morphological and structural characteristics of the alumina powder prepared by combustion reaction. It was evaluated different types of external heating: muffle oven, microwave oven and ceramic plate with electrical spiral resistance. The powders were prepared according to the propellants and explosives theory, using urea in the stoichiometric proportion (Φe = 1). During the synthesis parameters such as flame combustion time and temperature were measured. The structural and morphological characteristics of the powders were evaluate by XRD, particle size distribution, SEM and nitrogen adsorption (BET). The results showed the production of -alumina as unique phase and formed by agglomerates with irregular plate shape of thin particles for all studied conditions. The powders prepared by electrical oven presented small particle size, with narrow agglomerates size distribution.

Download Full-text

THE RELATIONSHIP BETWEEN STRUCTURAL STABILITY AND CHEMICAL CRITERIA OF SOME SOLONETZIC SOILS OF NORTHWESTERN ALBERTA

Canadian Journal of Soil Science ◽

10.4141/cjss67-036 ◽

1967 ◽

Vol 47 (3) ◽

pp. 231-237 ◽

Cited By ~ 1

Author(s):

S. W. Reeder ◽

M. A. Arshad ◽

Wm. Odynsky

Keyword(s):

Particle Size ◽

Chemical Composition ◽

Particle Size Distribution ◽

Size Distribution ◽

Structural Stability ◽

Morphological Characteristics ◽

Aggregate Stability ◽

Water Stability ◽

The Relationship ◽

Exchange Acidity

The Solonetzic soils of this study included three profiles at each of two widely separated sites that had a range in morphological characteristics from Solonetz to Solod soils. The soils had developed under similar conditions and were as identical between sites as could be determined by field methods.Clay mineral properties, particle size distribution, and total chemical composition of the soils revealed the uniformity of materials within and between sites.Differences in the soils, within and between sites, were disclosed by exchange analysis, soluble salt analysis, pH's and water stability of aggregates.The results of this study indicate that pH as well as Al3+ and exchange acidity content play a role in determining aggregate stability in these soils. Some hypotheses of the formation of stable structure in the B horizons of these soils are discussed in the light of the evidence presented.

Download Full-text

Identifying morphological characteristics of solid particles based on digital image analysis

Vestnik IGEU ◽

10.17588/2072-2672.2020.3.064-070 ◽

2020 ◽

pp. 64-70

Author(s):

A.V. Ogurtzov ◽

Yu.V. Khokhlova ◽

V.E. Mizonov ◽

V.A. Ogurtzov

Keyword(s):

Image Processing ◽

Particle Size ◽

Particle Size Distribution ◽

Size Distribution ◽

Digital Image Processing ◽

Digital Image ◽

Bulk Material ◽

Morphological Characteristics ◽

Solid Particles ◽

Coal Particles

Enriched coal as an energy source has a number of undeniable environmental and economic advantages, and has a higher calorific value. Important characteristics that affect the technological process of coal flotation are the particle size distribution, the shape of the coal particles and their surface texture. Screen analysis is the most common method for determining the granulometric composition of granular media. However, it is not sensitive to the shape of the particles and the nature of their surface. With the sieve method of analysis, there is no direct measurement of any axes of the particle, except the case when the particle is ball-shaped. In this case, its size coincides with the edge length of the square mesh of the sieve. Thus, two particles of completely different shapes can pass through the same sieve opening. Our task was to develop a simple technique that allows identifying the shape and texture parameters of particles of the bulk material. To solve the problem in question, the algorithm implemented in MATLAB (Image Processing Toolbox) and the concept of fractals are used. A method for estimating the shape and texture of bulk material particles based on digital image processing has been proposed. The particle size distribution curves are constructed, obtained by sieving method and image processing method. It was found that these curves are in good agreement with each other. Digital image processing is an alternative to identifying the important quality characteristics of bulk materials.

Download Full-text

Investigation the influence of mechanochemical processing on solubility of verapamil hydrochloride

Tehnika ◽

10.5937/tehnika2101009s ◽

2021 ◽

Vol 76 (1) ◽

pp. 9-14

Author(s):

Ana Stanković ◽

Sonja Jovanović

Keyword(s):

Particle Size ◽

Particle Size Distribution ◽

Size Distribution ◽

Morphological Characteristics ◽

Pharmaceutical Products ◽

Mechanochemical Treatment ◽

Full Potential ◽

Verapamil Hydrochloride ◽

Vis Spectroscopy ◽

The Impact

Dissolution of drugs is a very important factor that directly affects their potential application. Due to the fact that solubility may act as a limiting factor in the process of absorption of the drug, it can also affect its bio-availableness. More than 40 percent of potential drugs have a property of a poor solubility in the water, resulting in potentially important pharmaceutical products not reaching patients or reaching their full potential. This work examined the possibility of improving the solubility of verapamil hydrochloride (VHCl) by applying mechanochemical treatment. The impact of mechanochemical treatment on physiochemical properties was comprehended by applying XRPD, FTIR and Raman spectroscopy, as well as FESEM analysis. Besides, particle size distribution was determined. Solubility of verapamil hydrochloride was determined by using UV-VIS spectroscopy. Finally, the solubility of verapamil hydrochloride was correlated with particle size distribution, structural and morphological characteristics.

Download Full-text