Tunable 3D and 2D polystyrene nanoparticle assemblies using surface wettability, low volume fraction and surfactant effects

2008 ◽  
Vol 20 (2) ◽  
pp. 025604 ◽  
Author(s):  
S Pillai ◽  
A G Hemmersam ◽  
R Mukhopadhyay ◽  
R L Meyer ◽  
S M Moghimi ◽  
...  
Keyword(s):  
Volume Fraction ◽  
Surface Wettability ◽  
Nanoparticle Assemblies ◽  
Low Volume ◽  
Surfactant Effects

LOW CONCENTRATION LIMIT FOR A FLUID FLOW THROUGH A FILTER

1998 ◽  
Vol 08 (04) ◽  
pp. 623-643 ◽  
Author(s):  
SANJA MARUŠIĆ
Keyword(s):  
Asymptotic Behavior ◽  
Fluid Flow ◽  
Volume Fraction ◽  
Periodic Array ◽  
Concentration Limit ◽  
Global Flow ◽  
Low Concentration ◽  
Flow Through ◽  
Low Volume ◽  
Filtration Law

A fluid flow through an ∊-periodic array of obstacles distributed on a hypersurface (filter) is considered. The study of the asymptotic behavior as ∊→0 for two critical sizes of obstacles ∊ and ∊2 gives two different laws describing a global flow. In this paper we study the case of an intermediate obstacle size ∊β, 1 < β < 2 and we prove the continuity of the filtration law in the low-volume fraction limit.

scholarly journals Aggregation kinetics of irreversible patches coupled with reversible isotropic interaction leading to chains, bundles and globules

2018 ◽  
Vol 90 (6) ◽  
pp. 1085-1098 ◽  
Author(s):  
Isha Malhotra ◽  
Sujin B. Babu
Keyword(s):  
Self Assembly ◽  
Patch Size ◽  
Colloidal Particles ◽  
Volume Fraction ◽  
Interaction Strength ◽  
Colloidal System ◽  
Angle Distribution ◽  
Volume Fractions ◽  
Low Volume ◽  
A Chain

Abstract In the present study we are performing simulation of simple model of two patch colloidal particles undergoing irreversible diffusion limited cluster aggregation using patchy Brownian cluster dynamics. In addition to the irreversible aggregation of patches, the spheres are coupled with isotropic reversible aggregation through the Kern–Frenkel potential. Due to the presence of anisotropic and isotropic potential we have also defined three different kinds of clusters formed due to anisotropic potential and isotropic potential only as well as both the potentials together. We have investigated the effect of patch size on self-assembly under different solvent qualities for various volume fractions. We will show that at low volume fractions during aggregation process, we end up in a chain conformation for smaller patch size while in a globular conformation for bigger patch size. We also observed a chain to bundle transformation depending on the attractive interaction strength between the chains or in other words depending on the quality of the solvent. We will also show that bundling process is very similar to nucleation and growth phenomena observed in colloidal system with short range attraction. We have also studied the bond angle distribution for this system, where for small patches only two angles are more probable indicating chain formation, while for bundling at very low volume fraction a tail is developed in the distribution. While for the case of higher patch angle this distribution is broad compared to the case of low patch angles showing we have a more globular conformation. We are also proposing a model for the formation of bundles which are similar to amyloid fibers using two patch colloidal particles.

Observation of soft glassy behavior in a magnetic colloid exposed to an external magnetic field

Soft Matter ◽  
2020 ◽  
Vol 16 (30) ◽  
pp. 7126-7136
Author(s):  
Sithara Vinod ◽  
Philip J. Camp ◽  
John Philip
Keyword(s):  
Magnetic Field ◽  
External Magnetic Field ◽  
Applied Field ◽  
Uniform Magnetic Field ◽  
Volume Fraction ◽  
High Rate ◽  
Glassy Behavior ◽  
Low Volume

Microstructures (viewed in a direction perpendicular and parallel to the applied field) responsible for soft glassy behavior in a ferrofluid of low volume fraction when a uniform magnetic field is applied at a sufficiently high rate.

Correlation of Vulcanization and Viscoelastic Properties of Nanocomposites Based on Natural Rubber and Different Nanofillers, with Molecular and Supramolecular Structure

2010 ◽  
Vol 83 (1) ◽  
pp. 16-34 ◽  
Author(s):  
Mithun Bhattacharya ◽  
Anil K. Bhowmick
Keyword(s):  
Natural Rubber ◽  
Rheological Properties ◽  
Supramolecular Structure ◽  
Carbon Nanofiber ◽  
Volume Fraction ◽  
Barrier Properties ◽  
Qualitative Description ◽  
Viscoelastic Parameters ◽  
Low Volume ◽  
And Performance

Abstract Elastomer nanocomposites reinforced with low volume fraction of nanofillers, such as nanoclays and carbon nanofibers, have long been known to possess significantly improved mechanical, thermal, dynamic mechanical, flame retardant, and barrier properties. The present work attempts to evaluate the effect of nanofillers (like modified and unmodified montmorillonite, sepiolite, carbon nanofiber, and carbon black) and their amount on vulcanization, as well as dynamic and rheological properties in the prevulcanization and postvulcanization stages. Upon using organomodified nanoclay, optimum cure time was reduced and cure rate index increased; whereas, in comparison, carbon nanofiber resulted in a slower cure. The influence of loading of some representative nanofillers on natural rubber was studied through qualitative description of critical dynamic viscoelastic parameters, which indicated the formation of supramolecular structure even at low volume fraction. The nanocomposite vulcanizates showed solidlike rheological behavior and upon implementation of dispersion techniques the activation energy of flow was reduced by around 60%. The knowledge of cure and rheological properties of the compounds, which evolves from the structure formation, can be utilized for assessing process optimization, cost reduction, and performance of the nanocomposites.

Study of 1–3 PZT Fibre/Epoxy Composites with Low Volume Fraction of Ceramics

2004 ◽  
Vol 63 (1) ◽  
pp. 109-115 ◽  
Author(s):  
S. H. CHOY ◽  
H. L. W. CHAN ◽  
M. W. NG ◽  
P. C. K. LIU
Keyword(s):  
Volume Fraction ◽  
Epoxy Composites ◽  
Low Volume

Sans from low volume fraction of plate-like precipitates present in two single-crystal Ni-base superalloys

1998 ◽  
Vol 39 (6) ◽  
pp. 715-721 ◽  
Author(s):  
R. Gilles ◽  
D. Mukherji ◽  
P. Strunz ◽  
S. Lieske ◽  
A. Wiedenmann ◽  
...  
Keyword(s):  
Single Crystal ◽  
Volume Fraction ◽  
Low Volume
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