A Self-Assembly Phase Diagram from Amphiphilic Perylene Diimides

2012 ◽  
Vol 18 (39) ◽  
pp. 12305-12313 ◽  
Author(s):  
Zhigang Zhang ◽  
Chuanlang Zhan ◽  
Xin Zhang ◽  
Shanlin Zhang ◽  
Jianhua Huang ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Self Assembly ◽  
Perylene Diimides

Self-assembly, optical and electrical properties of five membered O- or S-heterocyclic annulated perylene diimides

2016 ◽  
Vol 135 ◽  
pp. 41-48 ◽  
Author(s):  
Yongshan Ma ◽  
Zhiqiang Shi ◽  
Andong Zhang ◽  
Jiaofu Li ◽  
Xiaofeng Wei ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Self Assembly ◽  
Optical And Electrical Properties ◽  
Perylene Diimides

scholarly journals The self assembly of proteins; probing patchy protein interactions

2015 ◽  
Vol 17 (7) ◽  
pp. 5413-5420 ◽  
Author(s):  
Susan James ◽  
Michelle K. Quinn ◽  
Jennifer J. McManus
Keyword(s):  
Phase Diagram ◽  
Thermodynamic Properties ◽  
Protein Interactions ◽  
Self Assembly ◽  
The Self ◽  
Protein Surface ◽  
Competing Interactions ◽  
Diagram Approach

Anisotropy is central to protein self-assembly. The kinetic and thermodynamic properties of proteins in which competing interactions exist due to the anisotropic or patchy nature of the protein surface have been explored using a phase diagram approach.

Impact of Wet-Dry Cycling on the Phase Behavior and Compartmentalization Properties of Complex Coacervates

2020 ◽  
Author(s):  
Hadi Fares ◽  
Alexander Marras ◽  
Jeffrey Ting ◽  
Matthew Tirrell ◽  
Christine Keating
Keyword(s):  
Phase Diagram ◽  
Phase Behavior ◽  
Self Assembly ◽  
Building Blocks ◽  
Early Earth ◽  
Local Concentration ◽  
Acid System ◽  
Initial Composition ◽  
Molecular Building Blocks ◽  
Polyelectrolyte Solutions

<div>Wet-dry cycling on the early Earth is thought to have facilitated production of molecular building blocks of life, but thus far its impact on self-assembly and compartmentalization of resulting (macro)molecules has been limited. We investigated dehydration/rehydration of complex coacervates, which are membraneless compartments formed by phase separation of polyelectrolyte solutions, and suggested as protocell models. Depending on initial composition of a poly(diallyldimethylammonium)/poly(acrylic acid) system, drying enabled formation or disassembly of coacervate droplets. In compartments surviving tenfold dehydration, partitioning of a fluorescent RNA oligonucleotide decreased, while its local concentration inside the coacervates remained nearly constant, despite increasing tenfold globally. RNA mobility was also enhanced as the system dehydrated. These changes can be understood as resulting from drying induced compositional movements on the phase diagram, with increased ionic strength being particularly important in determining coacervate properties. These results showed that wet-dry cycling can alter the phase behavior and protocell-relevant functions of complex coacervates.</div>

Simulation study on the assembly of rod-coil diblock copolymers within coil-selective nanoslits

e-Polymers ◽  
2016 ◽  
Vol 16 (4) ◽  
pp. 343-349 ◽  
Author(s):  
Ya-Juan Su ◽  
Ze-Xin Ma ◽  
Jian-Hua Huang
Keyword(s):  
Phase Diagram ◽  
Self Assembly ◽  
Diblock Copolymers ◽  
Dissipative Particle Dynamics ◽  
Orientational Order ◽  
Particle Dynamics ◽  
The Self ◽  
Ordered Structures ◽  
Assembly Structure ◽  
Dynamics Simulations

AbstractDissipative particle dynamics simulations are performed to study the self-assembly of rod-coil (RC) diblock copolymers confined in a slit with two coil-selective surfaces. The effect of rod length and slit thickness on the assembly structure is investigated. A morphological phase diagram as a function of slit thickness and rod length is presented. We observe several ordered structures, such as perpendicular cylinders, parallel cylinders, and puck-shaped structure. In the assembly structures, long-range rod-rod orientational order is observed when the rod length exceeds a critical rod length. Our results show that the coil-selective slit influences the assembly structure as well as the rod orientation of RC diblock copolymers.

Self-assembly of granular spheres under one-dimensional vibration

Soft Matter ◽  
2018 ◽  
Vol 14 (48) ◽  
pp. 9856-9869 ◽  
Author(s):  
Reza Amirifar ◽  
Kejun Dong ◽  
Qinghua Zeng ◽  
Xizhong An
Keyword(s):  
Phase Diagram ◽  
Self Assembly ◽  
The Self ◽  
Sinusoidal Vibration ◽  
One Dimensional

The self-assembly of granular spheres under simple 1D sinusoidal vibration is studied and the correspondingA–fphase diagram is established.

scholarly journals Purely entropic self-assembly of the bicontinuous Ia 3 d gyroid phase in equilibrium hard-pear systems

2017 ◽  
Vol 7 (4) ◽  
pp. 20160161 ◽  
Author(s):  
Philipp W. A. Schönhöfer ◽  
Laurence J. Ellison ◽  
Matthieu Marechal ◽  
Douglas J. Cleaver ◽  
Gerd E. Schröder-Turk
Keyword(s):  
Phase Diagram ◽  
Minimal Surface ◽  
Lipid Bilayers ◽  
Self Assembly ◽  
Particle Shape ◽  
Voronoi Tessellation ◽  
Gauss Curvature ◽  
Constant Density ◽  
Continuous Change ◽  
Link Type

We investigate a model of hard pear-shaped particles which forms the bicontinuous Ia d structure by entropic self-assembly, extending the previous observations of Barmes et al. (2003 Phys. Rev. E 68 , 021708. ( doi:10.1103/PhysRevE.68.021708 )) and Ellison et al. (2006 Phys. Rev. Lett. 97 , 237801. ( doi:10.1103/PhysRevLett.97.237801 )). We specifically provide the complete phase diagram of this system, with global density and particle shape as the two variable parameters, incorporating the gyroid phase as well as disordered isotropic, smectic and nematic phases. The phase diagram is obtained by two methods, one being a compression–decompression study and the other being a continuous change of the particle shape parameter at constant density. Additionally, we probe the mechanism by which interdigitating sheets of pears in these systems create surfaces with negative Gauss curvature, which is needed to form the gyroid minimal surface. This is achieved by the use of Voronoi tessellation, whereby both the shape and volume of Voronoi cells can be assessed in regard to the local Gauss curvature of the gyroid minimal surface. Through this, we show that the mechanisms prevalent in this entropy-driven system differ from those found in systems which form gyroid structures in nature (lipid bilayers) and from synthesized materials (di-block copolymers) and where the formation of the gyroid is enthalpically driven. We further argue that the gyroid phase formed in these systems is a realization of a modulated splay-bend phase in which the conventional nematic has been predicted to be destabilized at the mesoscale due to molecular-scale coupling of polar and orientational degrees of freedom.

scholarly journals Impact of Wet-Dry Cycling on the Phase Behavior and Compartmentalization Properties of Complex Coacervates

2020 ◽  
Author(s):  
Hadi Fares ◽  
Alexander Marras ◽  
Jeffrey Ting ◽  
Matthew Tirrell ◽  
Christine Keating
Keyword(s):  
Phase Diagram ◽  
Phase Behavior ◽  
Self Assembly ◽  
Building Blocks ◽  
Early Earth ◽  
Local Concentration ◽  
Acid System ◽  
Initial Composition ◽  
Molecular Building Blocks ◽  
Polyelectrolyte Solutions

<div>Wet-dry cycling on the early Earth is thought to have facilitated production of molecular building blocks of life, but thus far its impact on self-assembly and compartmentalization of resulting (macro)molecules has been limited. We investigated dehydration/rehydration of complex coacervates, which are membraneless compartments formed by phase separation of polyelectrolyte solutions, and suggested as protocell models. Depending on initial composition of a poly(diallyldimethylammonium)/poly(acrylic acid) system, drying enabled formation or disassembly of coacervate droplets. In compartments surviving tenfold dehydration, partitioning of a fluorescent RNA oligonucleotide decreased, while its local concentration inside the coacervates remained nearly constant, despite increasing tenfold globally. RNA mobility was also enhanced as the system dehydrated. These changes can be understood as resulting from drying induced compositional movements on the phase diagram, with increased ionic strength being particularly important in determining coacervate properties. These results showed that wet-dry cycling can alter the phase behavior and protocell-relevant functions of complex coacervates.</div>

Phase separation and self-assembly of colloidal dimers with tunable attractive strength: from symmetrical square-wells to Janus dumbbells

Soft Matter ◽  
2014 ◽  
Vol 10 (29) ◽  
pp. 5269-5279 ◽  
Author(s):  
Gianmarco Munaò ◽  
Patrick O’Toole ◽  
Toby S. Hudson ◽  
Dino Costa ◽  
Carlo Caccamo ◽  
...  
Keyword(s):  
Phase Diagram ◽  
Phase Separation ◽  
Self Assembly ◽  
Fluid Phase ◽  
Square Well

Progressive modification of the fluid phase diagram of colloidal dimers, from symmetrical square-well to Janus dumbbells.

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