scholarly journals Solvent-Induced Assembly of One-Patch Silica Nanoparticles into Robust Clusters, Wormlike Chains and Bilayers

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 100
Author(s):  
Bin Liu ◽  
Serge Ravaine ◽  
Etienne Duguet
Keyword(s):  
Particle Size ◽  
Silica Nanoparticles ◽  
Self Assembly ◽  
Size Ratio ◽  
Experimental Conditions ◽  
Planar Bilayers ◽  
Particle Size Ratio ◽  
Assembly Kinetics ◽  
Fine Control ◽  
Small Clusters

We report the synthesis and solvent-induced assembly of one-patch silica nanoparticles in the size range of 100–150 nm. They consisted, as a first approximation, of silica half-spheres of which the truncated face was itself concave and carried in its center a polymeric patch made of grafted polystyrene chains. The multistage synthesis led to 98% pure batches and allowed a fine control of the patch-to-particle size ratio from 0.69 to 1.54. The self-assembly was performed in equivolume mixtures of tetrahydrofuran and ethanol, making the polymeric patches sticky and ready to coalesce together. The assembly kinetics was monitored by collecting samples over time and analyzing statistically their TEM images. Small clusters, such as dimers, trimers, and tetramers, were formed initially and then evolved in part into micelles. Accordingly to previous simulation studies, more or less branched wormlike chains and planar bilayers were observed in the long term, when the patch-to-particle size ratio was high enough. We focused also on the experimental conditions that could allow preparing small clusters in a good morphology yield.

scholarly journals Templated Synthesis and Assembly of Two-, Three- and Six-Patch Silica Nanoparticles with a Controlled Patch-to-Particle Size Ratio

Molecules ◽  
2021 ◽  
Vol 26 (16) ◽  
pp. 4736
Author(s):  
Bin Liu ◽  
Stéphanie Exiga ◽  
Etienne Duguet ◽  
Serge Ravaine
Keyword(s):  
Particle Size ◽  
Silica Nanoparticles ◽  
Self Assembly ◽  
Three Dimensional ◽  
Nanoparticle Synthesis ◽  
Polymer Chains ◽  
Size Ratio ◽  
Particle Size Ratio ◽  
Silica Core ◽  
Future Work

We report a fabrication route of silica nanoparticles with two, three or six patches with an easily tunable patch-to-particle size ratio. The synthetic pathway includes two main stages: the synthesis of silica/polystyrene multipod-like templates and the selective growth of their silica core through an iterative approach. Electron microscopy of the dimpled nanoparticles obtained after dissolution of the polystyrene nodules of the multipod-like nanoparticles provides evidence of the conformational growth of the silica core. Thanks to the presence of some polymer chains, which remained grafted at the bottom of the dimples after the dissolution of the PS nodules, the solvent-induced assembly of the patchy nanoparticles is performed. Chains, hexagonal suprastructures and cubic lattices are obtained from the assembly of two-, three- and six-patch silica nanoparticles, respectively. Our study can guide future work in both patchy nanoparticle synthesis and self-assembly. It also opens new routes towards the fabrication of specific classes of one-, two- and three-dimensional colloidal lattices, including complex tilings.

Simulation on Extrusion Comminution Model of Roller Press

2010 ◽  
Vol 156-157 ◽  
pp. 1702-1707
Author(s):  
Xiang Wen Cheng ◽  
Jinchao Liu ◽  
Qi Zhi Ding ◽  
Li Ming Song ◽  
Zhan Lin Wang
Keyword(s):  
Experimental Data ◽  
Particle Size ◽  
Field Experiments ◽  
Size Ratio ◽  
Optimum Operating ◽  
Extrusion Force ◽  
Particle Size Ratio ◽  
Small Constant ◽  
Working Parameters ◽  
The Relationship

How to predict the relationship among particle size and among product size, to establish the relationship between the granularity and working parameters in the process of grinding and to determine the optimum operating parameters. With proposing BS squeeze crush model by L. Bass and the idea of roll surface division as the material uneven extrusion force are adopted. Based on field experiments the experimental data is analyzed, the select function and the breakage functions are fitted with MATLAB software, and obtaining their model. The comminution model is determined by the roller division. We obtain the model parameter through the experimental data. Through model analysis shows: the relationship between particle breakage and energy absorption, namely the smaller size of the same power, the lower broken; the breakage diminishes with the decrease of particle size ratio and it will be tending to a small constant when the smaller particle size ratio. The breakage functions rapidly decrease within ratio of between 0.2-0.7. This shows: the energy consumption will rapidly increase when the particle size of less than 0.2 in broken; the selection diminish with the decrease of particle size. Pressure (8-9MPa) should be the most appropriate value.

Particle size ratio and distribution effects on packing behaviour of crushed GMZ bentonite pellets

2019 ◽  
Vol 351 ◽  
pp. 92-101 ◽  
Author(s):  
Zhang-Rong Liu ◽  
Wei-Min Ye ◽  
Zhao Zhang ◽  
Qiong Wang ◽  
Yong-Gui Chen ◽  
...  
Keyword(s):  
Particle Size ◽  
Size Ratio ◽  
Gmz Bentonite ◽  
Particle Size Ratio

scholarly journals Effect of particle size distribution on rheological properties of chocolate

2020 ◽  
Vol 11 (11) ◽  
pp. 9547-9559
Author(s):  
Annika Feichtinger ◽  
Elke Scholten ◽  
Guido Sala
Keyword(s):  
Surface Roughness ◽  
Particle Size ◽  
Particle Size Distribution ◽  
Rheological Properties ◽  
Size Distribution ◽  
Particle Shape ◽  
Size Ratio ◽  
Particle Size Ratio ◽  
Effect Of Particle Size

Particle size distribution and particle size ratio have an important effect on rheological properties of model chocolate samples, but also other factors like particle shape, surface roughness and hydrophilicity should be taken into account.

scholarly journals Reconfigurable assembly of charged polymer-modified Janus and non-Janus particles: from half-raspberries to colloidal clusters and chains

2019 ◽  
Vol 1 (9) ◽  
pp. 3715-3726 ◽  
Author(s):  
Claudia Marschelke ◽  
Olga Diring ◽  
Alla Synytska
Keyword(s):  
Particle Size ◽  
Binary Mixtures ◽  
Size Ratio ◽  
Janus Particles ◽  
Colloidal Clusters ◽  
Particle Size Ratio ◽  
Charged Polymer ◽  
Reconfigurable Assembly

pH-triggered, reconfigurable assembly of binary mixtures of hybrid hairy Janus and non-Janus colloids to half-raspberry-like constructs, colloidal clusters and colloidal chains depending on particle size ratio and numerical ratio.

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