Comment on “Curvature capillary migration of microspheres” by N. Sharifi-Mood, I. B. Liu and K. J. Stebe, Soft Matter, 2015, 11, 6768

Soft Matter ◽  
2016 ◽  
Vol 12 (2) ◽  
pp. 328-330 ◽  
Author(s):  
P. Galatola
Keyword(s):  
Soft Matter ◽  
Colloidal Particles ◽  
Fluid Interface

Spherical colloidal particles floating at a fluid interface shaped as a uniform saddle, with equilibrium wetting conditions at the Young angle.

Patchy colloidal particles at the fluid–fluid interface

Soft Matter ◽  
2018 ◽  
Vol 14 (46) ◽  
pp. 9457-9465 ◽  
Author(s):  
Chung Chi Chio ◽  
Ying-Lung Steve Tse
Keyword(s):  
Colloidal Particles ◽  
Particle Density ◽  
Fluid Interface ◽  
Depletion Force

Imbalance of solvent particle density leads to depletion force.

scholarly journals Correction: Controlling the dynamics of colloidal particles by critical Casimir forces

Soft Matter ◽  
2020 ◽  
Vol 16 (22) ◽  
pp. 5334-5334
Author(s):  
Alessandro Magazzù ◽  
Agnese Callegari ◽  
Juan Pablo Staforelli ◽  
Andrea Gambassi ◽  
Siegfried Dietrich ◽  
...  
Keyword(s):  
Soft Matter ◽  
Colloidal Particles ◽  
Casimir Forces

Correction for ‘Controlling the dynamics of colloidal particles by critical Casimir forces’ by Alessandro Magazzù et al., Soft Matter, 2019, 15, 2152–2162, DOI: 10.1039/C8SM01376D.

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.

Real Area of Contact in a Soft Transparent Interface by Particle Exclusion Microscopy

2016 ◽  
Vol 138 (4) ◽  
Author(s):  
Kyle D. Schulze ◽  
Alex I. Bennett ◽  
Samantha Marshall ◽  
Kyle G. Rowe ◽  
Alison C. Dunn
Keyword(s):  
Flexible Electronics ◽  
Soft Matter ◽  
Colloidal Particles ◽  
Contact Region ◽  
Real Contact Area ◽  
The Real ◽  
Real Area Of Contact ◽  
Static Indentation ◽  
Real Area

Soft matter mechanics are characterized by high strains and time-dependent elastic properties, which complicate contact mechanics for emerging applications in biomedical surfaces and flexible electronics. In addition, hydrated soft matter precludes using interferometry to observe real areas of contact. In this work, we present a method for measuring the real area of contact in a soft, hydrated, and transparent interface by excluding colloidal particles from the contact region. We confirm the technique by presenting a Hertz-like quasi-static indentation (loading time > 1.4 hrs) by a polyacrylamide probe into a stiff flat surface in a submerged environment. The real contact area and width were calculated from in situ images of the interface processed to reduce image noise and thresholded to define the perimeter of contact. This simple technique of in situ particle exclusion microscopy (PEM) may be widely applicable for determining real areas of contact of soft, transparent interfaces.

scholarly journals Curvature dynamics and long-range effects on fluid–fluid interfaces with colloids

Soft Matter ◽  
2019 ◽  
Vol 15 (13) ◽  
pp. 2848-2862 ◽  
Author(s):  
A. Tiribocchi ◽  
F. Bonaccorso ◽  
M. Lauricella ◽  
S. Melchionna ◽  
A. Montessori ◽  
...  
Keyword(s):  
Long Range ◽  
Colloidal Particles ◽  
Fluid Interfaces ◽  
Fluid Interface ◽  
Fluid Mixture ◽  
Binary Fluid ◽  
Interface Curvature

The fluid–fluid interface curvature can provide new insights into local inhomogeneities of a binary fluid mixture containing colloidal particles.

scholarly journals Entropic formation of a thermodynamically stable colloidal quasicrystal with negligible phason strain

2021 ◽  
Vol 118 (7) ◽  
pp. e2011799118
Author(s):  
Kwanghwi Je ◽  
Sangmin Lee ◽  
Erin G. Teich ◽  
Michael Engel ◽  
Sharon C. Glotzer
Keyword(s):  
Soft Matter ◽  
Colloidal Particles ◽  
Strain Relaxation ◽  
Recognition Algorithm ◽  
Structural Quality ◽  
Pattern Recognition Algorithm ◽  
Transmission Electron ◽  
Energetic Interactions ◽  
High Degree

Quasicrystals have been discovered in a variety of materials ranging from metals to polymers. Yet, why and how they form is incompletely understood. In situ transmission electron microscopy of alloy quasicrystal formation in metals suggests an error-and-repair mechanism, whereby quasiperiodic crystals grow imperfectly with phason strain present, and only perfect themselves later into a high-quality quasicrystal with negligible phason strain. The growth mechanism has not been investigated for other types of quasicrystals, such as dendrimeric, polymeric, or colloidal quasicrystals. Soft-matter quasicrystals typically result from entropic, rather than energetic, interactions, and are not usually grown (either in laboratories or in silico) into large-volume quasicrystals. Consequently, it is unknown whether soft-matter quasicrystals form with the high degree of structural quality found in metal alloy quasicrystals. Here, we investigate the entropically driven growth of colloidal dodecagonal quasicrystals (DQCs) via computer simulation of systems of hard tetrahedra, which are simple models for anisotropic colloidal particles that form a quasicrystal. Using a pattern recognition algorithm applied to particle trajectories during DQC growth, we analyze phason strain to follow the evolution of quasiperiodic order. As in alloys, we observe high structural quality; DQCs with low phason strain crystallize directly from the melt and only require minimal further reduction of phason strain. We also observe transformation from a denser approximant to the DQC via continuous phason strain relaxation. Our results demonstrate that soft-matter quasicrystals dominated by entropy can be thermodynamically stable and grown with high structural quality––just like their alloy quasicrystal counterparts.

Capillary meniscus interaction between colloidal particles attached to a liquid—fluid interface

1992 ◽  
Vol 151 (1) ◽  
pp. 79-94 ◽  
Author(s):  
P.A Kralchevsky ◽  
V.N Paunov ◽  
I.B Ivanov ◽  
K Nagayama
Keyword(s):  
Colloidal Particles ◽  
Fluid Interface

Dynamic electric-field-induced response of charged spherical colloids in uncharged hydrogels

2009 ◽  
Vol 640 ◽  
pp. 357-400 ◽  
Author(s):  
MU WANG ◽  
REGHAN J. HILL
Keyword(s):  
Viscoelastic Properties ◽  
Soft Matter ◽  
Colloidal Particles ◽  
Theoretical Study ◽  
Physicochemical Characteristics ◽  
Hydrodynamic Characteristics ◽  
Induced Response ◽  
Complex Frequency ◽  
Polymer Interface ◽  
Polymeric Hydrogels

Embedding colloidal particles in polymeric hydrogels often endows the polymer skeleton with appealing characteristics for microfluidics and biosensing applications. This theoretical study provides a rigorous foundation for interpreting active electrical microrheology and electroacoustic experiments on such materials. In addition to viscoelastic properties of the composites, these techniques sense physicochemical characteristics of the particle–polymer interface. Wang & Hill (Soft Matter, vol. 4, 2008, p. 1048) studied the steady response of a rigid, impenetrable sphere in a compressible hydrogel skeleton. Here, we extend their analysis to arbitrary frequencies, showing, in general, how the frequency response depends on the particle size and charge, ionic strength of the electrolyte and elastic and hydrodynamic characteristics of the polymer skeleton. Our calculations capture the transition from quasi-steady compressible to quasi-steady incompressible dynamics as the frequency passes through the reciprocal draining time of the gel. Above the reciprocal draining time, the skeleton and fluid move in unison, so the dynamics are incompressible and, thus, given to an excellent approximation by the well-known dynamic electrophoretic mobility but with the Newtonian shear viscosity replaced by a complex, frequency-dependent value.

scholarly journals Correction: Electrokinetics and behavior near the interface of colloidal particles in non-polar dispersions

Soft Matter ◽  
2021 ◽  
Vol 17 (11) ◽  
pp. 3254-3254
Author(s):  
Manoj Prasad ◽  
Filip Strubbe ◽  
Filip Beunis ◽  
Kristiaan Neyts
Keyword(s):  
Soft Matter ◽  
Colloidal Particles ◽  
And Behavior

Correction for ‘Electrokinetics and behavior near the interface of colloidal particles in non-polar dispersions’ by Manoj Prasad et al., Soft Matter, 2017, 13, 5604–5612, DOI: 10.1039/C7SM00559H.

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