scholarly journals Quantitative Evaluation of Particle Dispersion State in a Dense Slurry and Control of Green Body Property

2020 ◽  
Vol 27 (0) ◽  
pp. 139-141
Author(s):  
Naoya IWATA ◽  
Takamasa MORI
Keyword(s):  
Quantitative Evaluation ◽  
Particle Dispersion ◽  
Green Body ◽  
Dispersion State ◽  
And Control

Quantitative Evaluation of d–π Interaction in Copper(i) Complexes and Control of Copper(i)–Dioxygen Reactivity

2004 ◽  
Vol 10 (1) ◽  
pp. 237-246 ◽  
Author(s):  
Takao Osako ◽  
Yoshimitsu Tachi ◽  
Matsumi Doe ◽  
Motoo Shiro ◽  
Kei Ohkubo ◽  
...  
Keyword(s):  
Quantitative Evaluation ◽  
Dioxygen Reactivity ◽  
And Control

scholarly journals Dispersion State Phase Diagram of Citrate-Coated Metallic Nanoparticles in Saline Solutions

2020 ◽  
Author(s):  
Sebastian Franco Ulloa ◽  
Giuseppina Tatulli ◽  
Sigbjørn Løland Bore ◽  
Mauro Moglianetti ◽  
Pier Paolo Pompa ◽  
...  
Keyword(s):  
Ionic Strength ◽  
Metallic Nanoparticles ◽  
Colloidal Stability ◽  
Particle Dispersion ◽  
Free Energy Calculations ◽  
Coarse Grained ◽  
Solvent Accessible Surface Area ◽  
Vis Spectroscopy ◽  
Dispersion State ◽  
Saline Solutions

The fundamental interactions underlying citrate-mediated chemical stability of metal nanoparticles (NPs), and their surface characteristics dictating particle dispersion/aggregation in aqueous solutions, are largely unclear. Here, we used a newly developed theoretical model to estimate the stoichiometry of citrate molecules chemisorbed onto spherical metallic NPs and define the uncovered solvent-accessible surface area of the NP. Then, we exploited two-body free energy calculations and extended coarse-grained molecular dynamics simulations of citrate-capped metallic NPs in saline solutions to explore an experimentally relevant range of NP charge, as well as the electrolytic medium’s ionic strength, a known trigger for aggregation. In this way, we define dispersion state phase diagrams of citrate-capped metal nanocolloids. UV-vis spectroscopy experiments validated our predictions and extended our results to NPs up to 35 nm. Altogether, our results disclose a complex interplay between the particle size, its surface charge density, and the ionic strength of the medium, which ultimately clarifies how these variables impact colloidal stability. <br>

scholarly journals Dispersion State Phase Diagram of Citrate-Coated Metallic Nanoparticles in Saline Solutions

2020 ◽  
Author(s):  
Sebastian Franco Ulloa ◽  
Giuseppina Tatulli ◽  
Sigbjørn Løland Bore ◽  
Mauro Moglianetti ◽  
Pier Paolo Pompa ◽  
...  
Keyword(s):  
Ionic Strength ◽  
Metallic Nanoparticles ◽  
Colloidal Stability ◽  
Particle Dispersion ◽  
Free Energy Calculations ◽  
Coarse Grained ◽  
Solvent Accessible Surface Area ◽  
Vis Spectroscopy ◽  
Dispersion State ◽  
Saline Solutions

The fundamental interactions underlying citrate-mediated chemical stability of metal nanoparticles (NPs), and their surface characteristics dictating particle dispersion/aggregation in aqueous solutions, are largely unclear. Here, we used a newly developed theoretical model to estimate the stoichiometry of citrate molecules chemisorbed onto spherical metallic NPs and define the uncovered solvent-accessible surface area of the NP. Then, we exploited two-body free energy calculations and extended coarse-grained molecular dynamics simulations of citrate-capped metallic NPs in saline solutions to explore an experimentally relevant range of NP charge, as well as the electrolytic medium’s ionic strength, a known trigger for aggregation. In this way, we define dispersion state phase diagrams of citrate-capped metal nanocolloids. UV-vis spectroscopy experiments validated our predictions and extended our results to NPs up to 35 nm. Altogether, our results disclose a complex interplay between the particle size, its surface charge density, and the ionic strength of the medium, which ultimately clarifies how these variables impact colloidal stability. <br>

Quantitative evaluation of fillers dispersion state in CaCO 3 /polypropylene composites through visualization and fractal analysis

2020 ◽  
Vol 41 (4) ◽  
pp. 1605-1613 ◽  
Author(s):  
Xiangmeng Lv ◽  
Ming Kang ◽  
Lu Yuan ◽  
Simin Shen ◽  
Rong Sun ◽  
...  
Keyword(s):  
Quantitative Evaluation ◽  
Fractal Analysis ◽  
Polypropylene Composites ◽  
Dispersion State
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