scholarly journals Self-Assembly of Microscopic Rods Due to Depletion Interaction

Entropy ◽  
2020 ◽  
Vol 22 (10) ◽  
pp. 1114
Author(s):  
Carles Calero ◽  
Ignacio Pagonabarraga
Keyword(s):  
Equilibrium State ◽  
Thermodynamic Model ◽  
Self Assembly ◽  
Strong Dependence ◽  
Aggregate Size ◽  
The Self ◽  
Size Distributions ◽  
Depletion Interaction ◽  
Amphiphilic Molecules ◽  
Thermodynamic Equilibrium State

In this article, using numerical simulations we investigate the self-assembly of rod-like particles in suspension due to depletion forces which naturally emerge due to the presence of smaller spherical depletant particles. We characterize the type of clusters that are formed and the evolution of aggregation departing from a random initial configuration. We show that eventually the system reaches a thermodynamic equilibrium state in which the aggregates break and reform dynamically. We investigate the equilibrium state of aggregation, which exhibits a strong dependence on depletant concentration. In addition, we provide a simple thermodynamic model inspired on the theory of self-assembly of amphiphilic molecules which allows us to understand qualitatively the equilibrium aggregate size distributions that we obtain in simulation.

Curvature modulates the self-assembly of amphiphilic molecules

2010 ◽  
Vol 133 (14) ◽  
pp. 144701 ◽  
Author(s):  
Falin Tian ◽  
Yu Luo ◽  
Xianren Zhang
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Amphiphilic Molecules

SELF-ORGANIZED QUANTUM DOTS

2002 ◽  
Vol 12 (01) ◽  
pp. 45-78 ◽  
Author(s):  
A. R. WOLL ◽  
P. RUGHEIMER ◽  
M. G. LAGALLY
Keyword(s):  
Quantum Dots ◽  
Quantum Dot ◽  
Self Assembly ◽  
The Self ◽  
Experimental Results ◽  
Size Distributions ◽  
Ongoing Research ◽  
Kinetics And Thermodynamics ◽  
Self Organized ◽  
Formation And Evolution

We review the concepts and principal experimental results pertaining to the self-assembly and self-ordering of quantum dots in semiconductor systems. We focus on the kinetics and thermodynamics of the formation and evolution of coherently strained 3D islands, and the effects of strain on nucleation, growth, and island shape. We also discuss ongoing research on methods to control the density, size, and size distributions of strained islands, both within a single strained layer and in quantum dot (QD) multilayers.

Synthesis of Ordered Microporous/Macroporous MOF-808 through Modulator-Induced Defect Formation, and Surfactant Self-Assembly Strategies

2019 ◽  
Author(s):  
Carolina Ardila-Suárez ◽  
Daniel R. Molina V. ◽  
Halima Alem ◽  
Víctor Gabriel Baldovino Medrano ◽  
Gustavo E Ramírez-Caballero
Keyword(s):  
Self Assembly ◽  
Active Sites ◽  
Defect Formation ◽  
The Self ◽  
Size Distributions ◽  
Pore Size Distributions ◽  
Interconnected Pores ◽  
Surfactant Assisted ◽  
Enhanced Crystallinity

<p>Ordered materials with interconnected porosity allow the diffusion of molecules within their inner porous structure to access the active sites located in the microporous core. As a follow-up of our work on engineering of MOF-808, in this contribution, we study the synthesis of defective MOF-808 using two different strategies: the use of modulators and the surfactant-assisted synthesis to obtain materials with ordered and interconnected pores. The results of the study indicated that (i) modulators agents led to formation of microporous/mesoporous MOFs through the formation of missing linker defects and (ii) the self-assembly of CTAB surfactant produced ordered microporous/macroporous network which enhanced crystallinity. However, the surface properties of the materials seem to be unaffected by the use of surfactants during synthesis. These results contribute to the development of ordered materials with a broad range of pore size distributions and give rise to new opportunities to extend the applications of MOF-808. </p>

Surface chemistry and interface science

2017 ◽  
Vol 19 (35) ◽  
pp. 23568-23569 ◽  
Author(s):  
Junbai Li ◽  
Krister Holmberg
Keyword(s):  
Surface Chemistry ◽  
Self Assembly ◽  
The Self ◽  
Amphiphilic Molecules ◽  
Interface Science

Surface chemistry and interface science is about phenomena at interfaces and the self-assembly of amphiphilic molecules.

scholarly journals Effects of molecular flexibility and head group repulsion on aramid amphiphile self-assembly

2021 ◽  
Author(s):  
Samuel Joshua Kaser ◽  
Andrew J. Lew ◽  
Dae-Yoon Kim ◽  
Ty Christoff-Tempesta ◽  
Yukio Cho ◽  
...  
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Strong Interactions ◽  
Head Group ◽  
Molecular Flexibility ◽  
Amphiphilic Molecules

The self-assembly of amphiphilic molecules in water has led to a wide variety of nanostructures with diverse applications. Many nanostructures are stabilized by strong interactions between monomer units, such as...

Phase Diagram for Reversibly-Assembled Rod-Like Aggregates: Nematic, Columnar and Crystalline Ordering

1989 ◽  
Vol 177 ◽  
Author(s):  
Mark P. Taylor ◽  
Judith Herzfeld
Keyword(s):  
Phase Diagram ◽  
Configurational Entropy ◽  
Aggregate Size ◽  
Calculated Phase Diagram ◽  
Size Distributions ◽  
Characteristic Sequence ◽  
Experimental Phase ◽  
Amphiphilic Molecules ◽  
A Cell ◽  
Orientational Ordering

ABSTRACTAqueous solutions of amphiphilic molecules which reversibly assemble into well defined polydisperse rod-like aggregates display a characteristic sequence of lyotropic mesophases including translational as well as orientational ordering. We have developed a model for such systems which incorporates a phenomenological description of aggregate assembly with a scaled particle calculation of the configurational entropy in the fluid dimensions and a cell theory description of the configurational entropy in the translationally ordered dimensions. The model reproduces many of the features seen in the experimental phase diagrams, including regions of isotropic, nematic, columnar and crystalline stability. In addition to the calculated phase diagram, related aggregate size distributions are reported.

scholarly journals Tunable longitudinal modes in extended silver nanoparticle assemblies

2016 ◽  
Vol 7 ◽  
pp. 1219-1228 ◽  
Author(s):  
Serene S Bayram ◽  
Klas Lindfors ◽  
Amy Szuchmacher Blum
Keyword(s):  
Silver Nanoparticle ◽  
Self Assembly ◽  
Aggregate Size ◽  
Building Blocks ◽  
Dipole Approximation ◽  
The Self ◽  
Nanoparticle Assemblies ◽  
Longitudinal Modes ◽  
Wide Range ◽  
Experimental Findings

Nanostructured materials with tunable properties are of great interest for a wide range of applications. The self-assembly of simple nanoparticle building blocks could provide an inexpensive means to achieve this goal. Here, we generate extended anisotropic silver nanoparticle assemblies in solution using controlled amounts of one of three inexpensive, widely available, and environmentally benign short ditopic ligands: cysteamine, dithiothreitol and cysteine in aqueous solution. The self-assembly of our extended structures is enforced by hydrogen bonding. Varying the ligand concentration modulates the extent and density of these unprecedented anisotropic structures. Our results show a correlation between the chain nature of the assembly and the generation of spectral anisotropy. Deuterating the ligand further enhances the anisotropic signal by triggering more compact aggregates and reveals the importance of solvent interactions in assembly size and morphology. Spectral and morphological evolutions of the AgNPs assemblies are followed via UV–visible spectroscopy and transmission electron microscopy (TEM). Spectroscopic measurements are compared to calculations of the absorption spectra of randomly assembled silver chains and aggregates based on the discrete dipole approximation. The models support the experimental findings and reveal the importance of aggregate size and shape as well as particle polarizability in the plasmon coupling between nanoparticles.

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