Thermal analysis and self-similarity law in particle size distribution of powder samples. Part 4

1993 ◽  
Vol 220 ◽  
pp. 191-201 ◽  
Author(s):  
Riko Ozao ◽  
Moyuru Ochiai
Keyword(s):  
Thermal Analysis ◽  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Self Similarity ◽  
Powder Samples ◽  
Similarity Law

scholarly journals Photocatalytic activity and charge carrier dynamics of TiO2 powders with a binary particle size distribution

2018 ◽  
Vol 20 (12) ◽  
pp. 8119-8132 ◽  
Author(s):  
Fabian Sieland ◽  
Jenny Schneider ◽  
Detlef W. Bahnemann
Keyword(s):  
Particle Size ◽  
Titanium Dioxide ◽  
Photocatalytic Activity ◽  
Particle Size Distribution ◽  
Charge Carrier ◽  
Size Distribution ◽  
Carrier Dynamics ◽  
Charge Carrier Dynamics ◽  
Powder Samples

The effects of the particle size distribution on the charge carrier dynamics and the photocatalytic activity of mixed titanium dioxide (TiO2) powder samples were investigated in this work.

scholarly journals Calcination on Ca-Mg-Al Hydrotalcite from Brine Water and Its Characterization

2017 ◽  
Vol 13 (2) ◽  
Author(s):  
Eddy Heraldy ◽  
Khoirina Dwi Nugrahaningtyas ◽  
Heriyanto Heriyanto
Keyword(s):  
Thermal Analysis ◽  
Particle Size ◽  
Particle Size Distribution ◽  
Metal Oxide ◽  
Size Distribution ◽  
Hydroxyl Groups ◽  
Absorption Region ◽  
Oh Groups ◽  
Wavenumber Region ◽  
Calcination Treatment

<p>The study of calcination treatment at 450°C on Ca-Mg-Al-hydrotalcite from brine water has been investigated. Characterization by XRD shows that Ca-Mg-Al hydrotalcite compound has found hydrotalcite phase and another phase such as Mg(OH)<sub>2</sub>, Al(OH)<sub>3</sub> and CaCO<sub>3</sub>. These results are confirmed by the presence of hydroxyl groups, M-O and M-OH groups (M is Mg, Ca and Al) at wavenumber region around 3464.35 cm<sup>-1</sup>, 447.50 cm<sup>-1</sup> and 531.41 cm<sup>-1</sup>. The calcination effect on Ca-Mg-Al hydrotalcite compounds at 450ºC being led to changes in structure become an metal oxide such as MgO, CaO, Al<sub>2</sub>O<sub>3</sub>, MgAl<sub>2</sub>O<sub>4</sub> and CaCO<sub>3</sub>. These results are confirmed from decreasing on the absorption peak of M-OH group at wavenumbers region around 531.41 cm<sup>-1</sup> and 786.99 cm<sup>-1</sup> and widening of the absorption region at 500-900 cm<sup>-1</sup>. Consequently, the calcination treatment successfully increased the surface area of Ca-Mg-Al hydrotalcite compounds from 97.4 m<sup>2</sup>/g to 156.826 m<sup>2</sup>/g. Morphology of Ca-Mg-Al hydrotalcite changes the shape from a big to be small shape and the particle size distribution of 0-0.25 μm into 0-1 μm. Thermal analysis showed changes in the structure of hydrotalcite into oxide begins at a temperature of 265°C and started to become oxide completely after the temperature reaches 428°C.</p>

scholarly journals Properties of Particle Size Distribution from Milled White Nixtamalized Corn Kernels as a Function of Steeping Time

Scientifica ◽  
2016 ◽  
Vol 2016 ◽  
pp. 1-9
Author(s):  
J. L. Fernández-Muñoz ◽  
M. Zapata-Torrez ◽  
A. Márquez-Herrera ◽  
F. Sánchez-Sinencio ◽  
J. G. Mendoza-Álvarez ◽  
...  
Keyword(s):  
Particle Size ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Average Particle ◽  
Hammer Mill ◽  
Corn Flour ◽  
Gaussian Profile ◽  
Final Weight ◽  
Powder Samples ◽  
Corn Kernels

This paper focuses on the particle size distribution (PSD) changes during nixtamalized corn kernels (NCK) as a function of the steeping time (ST). The process to obtain powder or corn flour from NCK was as follows: (i) the NCK with different STs were wet-milled in a stone mill, (ii) dehydrated by a Flash type dryer, and (iii) pulverized with a hammer mill and sieved with a 20 mesh. The powder was characterized by measuring the PSD percentage, calcium percentage (CP), peak viscosity at 90°C (PV), and crystallinity percentage (CP). The PSD of the powder as a function of ST was determined by sieving in Ro-TAP equipment. By sieving, five fractions of powder were obtained employing meshes 30, 40, 60, 80, and 100. The final weight of the PSD obtained from the sieving process follows a Gaussian profile with the maximum corresponding to the average particle obtained with mesh 60. The calcium percentage as a function of ST follows a behavior similar to the weight of the PSD. The study of crystallinity versus the mesh number shows that it decreases for smaller mesh number. A similar behavior is observed as steeping time increases, except around ST = 8 h where the gelatinization of starch is observed. The trend of increasing viscosity values of the powder samples occurs when increasing ST and decreasing particle size. The ST significantly changes the crystallinity and viscosity values of the powder and, in both cases, a minimum value is observed in the region 7–9 h. The experimental results show that the viscosity increases (decreases) if the particle size decreases (increases).

Effects of Particle Size Distribution on Corrosion Rate of Carbon Steel in Soil

2020 ◽  
Vol 69 (4) ◽  
pp. 102-106
Author(s):  
Shota Ohki ◽  
Shingo Mineta ◽  
Mamoru Mizunuma ◽  
Soichi Oka ◽  
Masayuki Tsuda
Keyword(s):  
Particle Size ◽  
Carbon Steel ◽  
Corrosion Rate ◽  
Particle Size Distribution ◽  
Size Distribution
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