scholarly journals Customizing New Titanium Dioxide Nanoparticles with Controlled Particle Size and Shape Distribution – A Feasibility Study towards Reference Materials for Quality Assurance of Non‐Spherical Nanoparticle Characterization

2021 ◽  
Author(s):  
Francesco Pellegrino ◽  
Erik Ortel ◽  
Johannes Mielke ◽  
Roland Schmidt ◽  
Valter Maurino ◽  
...  
Keyword(s):  
Particle Size ◽  
Quality Assurance ◽  
Titanium Dioxide ◽  
Feasibility Study ◽  
Reference Materials ◽  
Titanium Dioxide Nanoparticles ◽  
Nanoparticle Characterization ◽  
Shape Distribution ◽  
Size And Shape ◽  
Particle Size And Shape

scholarly journals An Experimental Study on the Particle Size and Shape Distribution of Coal Drill Cuttings by Dynamic Image Analysis

Geofluids ◽  
2021 ◽  
Vol 2021 ◽  
pp. 1-11
Author(s):  
Zhigang Zhang ◽  
Xiangyun Lan ◽  
Guangcai Wen ◽  
Qingming Long ◽  
Xuelin Yang
Keyword(s):  
Particle Size ◽  
Image Analysis ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Logarithmic Scale ◽  
Shape Distribution ◽  
Dynamic Image ◽  
Size And Shape ◽  
Dynamic Image Analysis ◽  
Particle Size And Shape

Particle size and shape distribution can be measured in great detail by dynamic image analysis (DIA). The narrow dispersion of repeated experiment results indicates that the particle size distribution can be obtained with high reliability. Particle size distribution can be better fitted to Rosin-Rammler equation than Gaudin-Schuhmann distribution and the lognormal distribution. The spread parameter ( m ) and the location parameters ( d 0 ) of the Rosin-Rammler equation can be calculated precisely. We analyzed the similarities and differences between the different particle shape distributions. The distributions of form factor and circularity are right-skewed distributions, while the distributions of ellipse ratio, irregularity, and aspect ratio obey a normal distribution. By studying the relation between particle size and shape, we find a linear relationship between the ellipse ratio and the Legendre ellipse diameter on the logarithmic scale.

scholarly journals Comparison of particle size and shape distribution of corundum produced by industrial ball mill and material bed compression

2021 ◽  
Vol 11 (5) ◽  
pp. 59-67
Author(s):  
László Tamás ◽  
Ádám Rácz
Keyword(s):  
Particle Size ◽  
Ball Mill ◽  
Material Selection ◽  
High Hardness ◽  
Shape Distribution ◽  
Size And Shape ◽  
Grinding Media ◽  
Significant Difference ◽  
Media Interaction ◽  
Particle Size And Shape

Comminution of corundum is a challenging task, as it has very high hardness and compression strength, and it is also a very abrasive material. Selection of the best comminution process for each particle size thus has a great importance. But for this, first we must understand the effects of different type of stresses and comminution methods used for the dry comminution of corundum. In this article the comparison of particle size and shape distribution of corundum produced by material bed compression and classic ball mill grinding is carried out. Comminution experiments were carried out in a laboratory scale piston press, to achieve material bed compression like in HPGR technology, and in a conventional industrial scale ball mill for particle-particle, particle-grinding media interaction. The results showed that the products of the two comminution methods have a significant difference both in particle size and shape distribution.

scholarly journals Filterability prediction of needle-like crystals based on particle size and shape distribution data

2019 ◽  
Vol 211 ◽  
pp. 768-781 ◽  
Author(s):  
Giulio Perini ◽  
Fabio Salvatori ◽  
David R. Ochsenbein ◽  
Marco Mazzotti ◽  
Thomas Vetter
Keyword(s):  
Particle Size ◽  
Distribution Data ◽  
Shape Distribution ◽  
Size And Shape ◽  
Particle Size And Shape

scholarly journals Impact of Coseismic Frictional Melting on Particle Size, Shape Distribution and Chemistry of Experimentally-Generated Pseudotachylite

2020 ◽  
Vol 8 ◽  
Author(s):  
Leny Montheil ◽  
Virginia G. Toy ◽  
James M. Scott ◽  
Thomas M. Mitchell ◽  
David P. Dobson
Keyword(s):  
Particle Size ◽  
Host Rock ◽  
Fractal Dimensions ◽  
Rock Composition ◽  
Slip Rates ◽  
Shape Distribution ◽  
Frictional Behavior ◽  
Particle Size And Shape ◽  
Frictional Melting ◽  
Glass Compositions

In natural friction melts, or pseudotachylites, clast textures and glass compositions can influence the frictional behavior of faults hosting pseudotachylites, and are, in turn, sensitive to the processes involved in pseudotachylite formation. Quantification of these parameters in situations where the host rock composition and formation conditions are well-constrained, such as analogue experiments, may yield calibrations that can be employed in analysis of natural pseudotachylites. In this paper, we experimentally-generated pseudotachylites in granitoid rocks (tonalite and Westerly granite) at Pconf = 40 MPa and slip rates of ∼0.1 m s−1, comparable to the conditions under which natural pseudotachylite is known to form in Earth’s upper crust. We find variations in both clast textures and glass compositions that reflect formation processes, and probably influence the frictional behavior of similar natural faults hosting pseudotachylite. Quantification of particle size and shape distribution with a semi-automatic image analysis method, combined with analysis of glass and host-rock composition of these experimentally generated pseudotachylites, reveals that the textures of pseudotachylite material evolved by combinations of 1) comminution, 2) heterogeneous frictional flash melting, and 3) homogeneous (diffusive) clast melting and/or marginal decrepitation. Fractal dimensions of pseudotachylite-hosted clasts (D ∼ 3) that are greater than those of marginal fragmented host rock particles (gouge, D ∼ 2.4), reflect an increase of the intensity of comminution by slip localisation during a pre-melting phase. Chemical analyses demonstrate that these pseudotachylite glasses were generated by frictional flash melting, where host rock phases melt individually. Biotite is the least resistant to melting, feldspar intermediate, and quartz is the most resistant. The peudotachylite glass generated in these experiments has an alkaline composition, is depleted in SiO2 compared to the bulk host-rock, and shows heterogeneous compositions in a single sample related to proximity to host-rock minerals. The percentage contributions of host rock phases to the melt, calculated by a mixing model, shows that glass compositions are dominated by plagioclase and biotite. Within the melt, margins of clasts were dissolved uniformly by diffusion and/or affected by marginal decrepitation, resulting in convex and round shapes with convexities averaging ∼0.8 and circularities averaging ∼0.65.

Size- and shape-dependent effects of titanium dioxide nanoparticles on the permeabilization of the blood–brain barrier

2017 ◽  
Vol 5 (48) ◽  
pp. 9558-9570 ◽  
Author(s):  
Xin Liu ◽  
Baiyan Sui ◽  
Jiao Sun
Keyword(s):  
Titanium Dioxide ◽  
Blood Brain Barrier ◽  
Titanium Dioxide Nanoparticles ◽  
Brain Barrier ◽  
Size And Shape ◽  
Blood Brain

Spherical TiO2-NPs permeabilize the BBB most efficiently by inducing cytoskeletal re-organization, and the neurotoxicity of TiO2-NPs appears minimal.

GROWING MEDIA VARYING IN PARTICLE SIZE AND SHAPE FOR GREENHOUSE TOMATO

2004 ◽  
pp. 307-311 ◽  
Author(s):  
S. Allaire ◽  
J. Caron ◽  
C. Ménard ◽  
M. Dorais
Keyword(s):  
Particle Size ◽  
Growing Media ◽  
Size And Shape ◽  
Greenhouse Tomato ◽  
Particle Size And Shape
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