Collapse-induced phase transitions in binary interfacial microgel monolayers

Soft Matter ◽  
2021 ◽  
Author(s):  
Johannes Harrer ◽  
Simone Ciarella ◽  
Marcel Rey ◽  
Hartmut Löwen ◽  
Liesbeth M. C. Janssen ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Self Assembly ◽  
Colloidal Particles ◽  
Polymer Network ◽  
Liquid Interface ◽  
Assembly Behavior

Microgels, consisting of a swollen polymer network, exhibit a more complex self-assembly behavior compared to incompressible colloidal particles, because of their ability to deform at a liquid interface or collapse upon compression.

scholarly journals Shape-driven solid–solid transitions in colloids

2017 ◽  
Vol 114 (20) ◽  
pp. E3892-E3899 ◽  
Author(s):  
Chrisy Xiyu Du ◽  
Greg van Anders ◽  
Richmond S. Newman ◽  
Sharon C. Glotzer
Keyword(s):  
Phase Transitions ◽  
Self Assembly ◽  
Thermal Activation ◽  
Colloidal Particles ◽  
Solid Phase ◽  
Control Variable ◽  
Fluid Phase ◽  
Model Systems ◽  
Coordination Polyhedra ◽  
System A

Solid–solid phase transitions are the most ubiquitous in nature, and many technologies rely on them. However, studying them in detail is difficult because of the extreme conditions (high pressure/temperature) under which many such transitions occur and the high-resolution equipment needed to capture the intermediate states of the transformations. These difficulties mean that basic questions remain unanswered, such as whether so-called diffusionless solid–solid transitions, which have only local particle rearrangement, require thermal activation. Here, we introduce a family of minimal model systems that exhibits solid–solid phase transitions that are driven by changes in the shape of colloidal particles. By using particle shape as the control variable, we entropically reshape the coordination polyhedra of the particles in the system, a change that occurs indirectly in atomic solid–solid phase transitions via changes in temperature, pressure, or density. We carry out a detailed investigation of the thermodynamics of a series of isochoric, diffusionless solid–solid phase transitions within a single shape family and find both transitions that require thermal activation or are “discontinuous” and transitions that occur without thermal activation or are “continuous.” In the discontinuous case, we find that sufficiently large shape changes can drive reconfiguration on timescales comparable with those for self-assembly and without an intermediate fluid phase, and in the continuous case, solid–solid reconfiguration happens on shorter timescales than self-assembly, providing guidance for developing means of generating reconfigurable colloidal materials.

scholarly journals Particle clustering and coating across scales: microfluidic and macrofluidic experiments

2021 ◽  
Author(s):  
Steven G. Jones
Keyword(s):  
Self Assembly ◽  
Colloidal Particles ◽  
Magnetic Field Gradient ◽  
Bond Number ◽  
Liquid Interface ◽  
Assembly System ◽  
Two Phase ◽  
Pass Through ◽  
Paramagnetic Microparticles ◽  
Number Of Particles

In this thesis, I study the self-assembly of monodisperse colloidal particles on liquid-liquid interfaces. Specifically, I examine the relevant parameters that govern the size of self-assembled clusters when they pass through a liquid-liquid interface. I first describe a millimeter length-scale self-assembly system, where I find that the number of particles within a sinking cluster is proportional to a power law of the dimensionless Bond number. I find that the sphere deposition geometry also plays an important role, where I observe distinctly different scaling for monolayer rafts in comparison to stacked sphere clusters. I then develop an analogous microfluidic self-assembly system, where I use a magnetic field gradient to self-assemble paramagnetic microparticles on an aqueous two-phase liquid-liquid interface. Here, I observe empirically that the number of particles within a microparticle cluster scales inversely with the magnetic Bond number.

Self-Assembly Behavior of Hairy Colloidal Particles with Different Architectures: Mixed versus Janus

Langmuir ◽  
2014 ◽  
Vol 30 (43) ◽  
pp. 12765-12774 ◽  
Author(s):  
A. Kirillova ◽  
G. Stoychev ◽  
L. Ionov ◽  
A. Synytska
Keyword(s):  
Self Assembly ◽  
Colloidal Particles ◽  
Assembly Behavior

scholarly journals Particle clustering and coating across scales: microfluidic and macrofluidic experiments

2021 ◽  
Author(s):  
Steven G. Jones
Keyword(s):  
Self Assembly ◽  
Colloidal Particles ◽  
Magnetic Field Gradient ◽  
Bond Number ◽  
Liquid Interface ◽  
Assembly System ◽  
Two Phase ◽  
Pass Through ◽  
Paramagnetic Microparticles ◽  
Number Of Particles

In this thesis, I study the self-assembly of monodisperse colloidal particles on liquid-liquid interfaces. Specifically, I examine the relevant parameters that govern the size of self-assembled clusters when they pass through a liquid-liquid interface. I first describe a millimeter length-scale self-assembly system, where I find that the number of particles within a sinking cluster is proportional to a power law of the dimensionless Bond number. I find that the sphere deposition geometry also plays an important role, where I observe distinctly different scaling for monolayer rafts in comparison to stacked sphere clusters. I then develop an analogous microfluidic self-assembly system, where I use a magnetic field gradient to self-assemble paramagnetic microparticles on an aqueous two-phase liquid-liquid interface. Here, I observe empirically that the number of particles within a microparticle cluster scales inversely with the magnetic Bond number.

Controllable fabrication of novel pH-, thermo-, and light-responsive supramolecular dendronized copolymers with dual self-assembly behavior

2018 ◽  
Vol 9 (22) ◽  
pp. 3080-3087 ◽  
Author(s):  
ChangAn Yang ◽  
Ling Chen ◽  
He Huang ◽  
Tuo Ji ◽  
YingXiang Jiang ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Self Assembly ◽  
Stimulus Responsive ◽  
Assembly Behavior ◽  
Controllable Fabrication ◽  
Reversible Phase

Novel tri-stimulus responsive supramolecular dendronized copolymers with dual self-assembly behavior are prepared, exhibiting fast and fully reversible phase transitions and trans–cis isomerization.

Evolution of Carbon Self-Assembly in Colloidal Phase Diagram

2002 ◽  
Vol 739 ◽  
Author(s):  
V. Bouda
Keyword(s):  
Phase Diagram ◽  
Phase Transitions ◽  
Self Assembly ◽  
Colloidal Particles ◽  
Thermal Fluctuation ◽  
Ionic Concentration ◽  
The Self ◽  
Colloidal Systems ◽  
Carbon Particles ◽  
Self Assembled

ABSTRACTThe growth of the self-assembled structure of carbon colloidal particles has been studied [1]. The system of carbon particles was processed in electrical field in polymer melt with controlled ionic concentration. The interpretation of the complex evolution of the self-assembled structure of carbon particles was given in terms of phase transitions of colloidal systems of carbon particles.Interactions between doublets of carbon black (CB) particles are interpreted in terms of DLVO approximation of interaction energy as multiples of average thermal fluctuation kT. Plots of the sum of energy of electrostatic repulsion and energy of van der Waals attraction versus separation between the doublets show the energy barriers to coagulation of high B and the energy wells with the secondary minima of depth W. The colloidal phase transitions appear at critical conjuncture of the concentration of ions in the medium and surface potential on the colloids. Six transition lines determine five phases of the assembly of carbon colloids in the proposed colloidal phase diagram: lateral vapor + axial vapor (vapor), lateral liquid + axial vapor (columnar liquid crystal), lateral liquid + axial liquid (smectic LC), lateral liquid + axial solid (nematic LC), and lateral solid + axial solid (solid).The diagram provides a tool to control the evolution of carbon self-assembly. The eventual morphology depends on the route of the steps of the processing. During the time elapsed in the LC state, the structure can reorganize and the eventual coagulation produces various crystals. On the contrary, the route outside the LC state can produce glass.

scholarly journals Self-Assembly of Shape-Tunable Oblate Colloidal Particles into Orientationally Ordered Crystals, Glassy Crystals and Plastic Crystals

Soft Matter ◽  
2021 ◽  
Author(s):  
Jiawei Lu ◽  
Xiangyu Bu ◽  
Xinghua Zhang ◽  
Bing Liu
Keyword(s):  
Crystal Structures ◽  
Self Assembly ◽  
Colloidal Particles ◽  
Building Blocks ◽  
Fundamental Question ◽  
The Self ◽  
Plastic Crystals ◽  
Self Assembled ◽  
Glassy Crystals ◽  
The Relationship

The shapes of colloidal particles are crucial to the self-assembled superstructures. Understanding the relationship between the shapes of building blocks and the resulting crystal structures is an important fundamental question....

Self-Assembly of Single Chain Janus Nanoparticles from Azobenzene-Containing Block Copolymers and Reversible Photoinduced Morphology Transition

2021 ◽  
Author(s):  
Wei Wen ◽  
Aihua Chen
Keyword(s):  
Block Copolymers ◽  
Experimental Research ◽  
Self Assembly ◽  
The Self ◽  
Single Chain ◽  
Morphology Transition ◽  
Janus Nanoparticles ◽  
Assembly Behavior

Self-assembly of amphiphilic single chain Janus nanoparticles (SCJNPs) is a novel and promising approach to fabricate assemblies with diversified morphologies. However, the experimental research of the self-assembly behavior of SCJNPs...

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