Explaining the disparity in nanofluid results: Role of morphology, material, and state of aggregation of colloidal particles

2020 ◽  
Vol 156 ◽  
pp. 119709 ◽  
Author(s):  
Nitai Chandra Maji ◽  
Jayanta Chakraborty
Keyword(s):  
Colloidal Particles

scholarly journals Multivalent weak interactions enhance selectivity of interparticle binding

2020 ◽  
Vol 117 (37) ◽  
pp. 22690-22697 ◽  
Author(s):  
M. R. W. Scheepers ◽  
L. J. van IJzendoorn ◽  
M. W. J. Prins
Keyword(s):  
Targeted Drug Delivery ◽  
Colloidal Particles ◽  
High Selectivity ◽  
Weak Interactions ◽  
Theoretical Work ◽  
Coated Particles ◽  
Receptor Interactions ◽  
Two Factors ◽  
Experimental Findings

Targeted drug delivery critically depends on the binding selectivity of cargo-transporting colloidal particles. Extensive theoretical work has shown that two factors are necessary to achieve high selectivity for a threshold receptor density: multivalency and weak interactions. Here, we study a model system of DNA-coated particles with multivalent and weak interactions that mimics ligand–receptor interactions between particles and cells. Using an optomagnetic cluster experiment, particle aggregation rates are measured as a function of ligand and receptor densities. The measured aggregation rates show that the binding becomes more selective for shorter DNA ligand–receptor pairs, proving that multivalent weak interactions lead to enhanced selectivity in interparticle binding. Simulations confirm the experimental findings and show the role of ligand–receptor dissociation in the selectivity of the weak multivalent binding.

scholarly journals The role of the medium in the effective-sphere interpretation of holographic particle characterization data

Soft Matter ◽  
2020 ◽  
Vol 16 (4) ◽  
pp. 891-898 ◽  
Author(s):  
Mary Ann Odete ◽  
Fook Chiong Cheong ◽  
Annemarie Winters ◽  
Jesse J. Elliott ◽  
Laura A. Philips ◽  
...  
Keyword(s):  
Refractive Index ◽  
Colloidal Particles ◽  
Particle Characterization ◽  
Sphere Model

Holographic particle characterization measurements can be interpreted with the effective-sphere model to obtain the size, refractive index and porosity of porous and irregularly shaped colloidal particles.

Role of natural organic matter (NOM), colloidal particles, and solution chemistry on ultrafiltration performance

2011 ◽  
Vol 78 (2) ◽  
pp. 189-200 ◽  
Author(s):  
A.W. Zularisam ◽  
Anwar Ahmad ◽  
Mimi Sakinah ◽  
A.F. Ismail ◽  
T. Matsuura
Keyword(s):  
Organic Matter ◽  
Natural Organic Matter ◽  
Colloidal Particles ◽  
Solution Chemistry

scholarly journals Introduction to Colloidal and Microfluidic Nematic Microstructures

Crystals ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 956
Author(s):  
Simon Čopar ◽  
Miha Ravnik ◽  
Slobodan Žumer
Keyword(s):  
Soft Matter ◽  
Liquid Crystalline ◽  
Colloidal Particles ◽  
Topological Defects ◽  
Crystalline Materials ◽  
Inherent Anisotropy ◽  
Metastable Structures ◽  
Liquid Crystalline Materials ◽  
Mesoscopic Theory

In this brief review, we give an introduction to selected colloidal and microfluidic nematic microstructures, as enabled by the inherent anisotropy and microscopic orientational ordering in complex liquid crystalline materials. We give a brief overview of the mesoscopic theory, for equilibrium and dynamics, of nematic fluids, that provides the framework for understanding, characterization, and even prediction of such microstructures, with particular comment also on the role of topology and topological defects. Three types of nematic microstructures are highlighted: stable or metastable structures in nematic colloids based on spherical colloidal particles, stationary nematic microfluidic structures, and ferromagnetic liquid crystal structures based on magnetic colloidal particles. Finally, this paper is in honor of Noel A. Clark, as one of the world pioneers that helped to shape this field of complex and functional soft matter, contributing at different levels to works of various groups worldwide, including ours.

scholarly journals PREPARATION OF CHITOSAN-GOLD NANOPARTICLES: PART 2. THE ROLE OF CHITOSAN

2010 ◽  
Vol 8 (3) ◽  
pp. 320-326 ◽  
Author(s):  
Adlim Adlim ◽  
Mohamad Abu Bakar
Keyword(s):  
Gold Nanoparticles ◽  
Acetic Acid ◽  
Colloidal Particles ◽  
Acetic Acid Solution ◽  
Molar Ratio ◽  
Plasmon Band ◽  
Gold Particles ◽  
Chitosan Matrix ◽  
Metal Colloid

Colloidal gold nanoparticles prepared by employing chitosan as the stabilizer in solvent of methanol-acetic acid solution were stable for months without precipitation. The mole ratio of chitosan-gold ions of 5:1 - 30:1 gave dispersed and fine gold particles in range of 9.4-10.4 nm. Gold reduction in chitosan matrix was faster at higher chitosan concentration, and molar ratio of chi : Au, from 5:1 to 40:1. Higher acidity of acetic acid (pH 2-6) led to faster reduction of gold ions. The intensity of gold metal colloid plasmon band increased at higher concentration of acetic acid. Chitosan functioned both as a stabilizer and a reducing agent for gold ions. Gold colloidal particles immobilized on chitosan coated TiO2 as the solid support gave more dispersed and smaller particles (4.6 nm) compared with gold particles supported on TiO2 without chitosan coating.   Keywords: gold nanoparticles, chitosan, chitosan coated TiO2

The role of polysaccharides on the stability of colloidal particles of beer

2016 ◽  
Vol 51 (5) ◽  
pp. 1284-1290
Author(s):  
Nancy Maria J. Martinez Amezaga ◽  
Elisa I. Benítez ◽  
Gladis L. Sosa ◽  
Nélida M. Peruchena ◽  
Jorge E. Lozano
Keyword(s):  
Colloidal Particles ◽  
The Stability

The role of image charges in the interactions between colloidal particles

Soft Matter ◽  
2008 ◽  
Vol 4 (8) ◽  
pp. 1582 ◽  
Author(s):  
Marius M. Hatlo ◽  
Leo Lue
Keyword(s):  
Colloidal Particles
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