Effect of shape on the self-assembly of faceted patchy nanoplates with irregular shape into tiling patterns

Soft Matter ◽  
2015 ◽  
Vol 11 (7) ◽  
pp. 1386-1396 ◽  
Author(s):  
Jaime A. Millan ◽  
Daniel Ortiz ◽  
Sharon C. Glotzer
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Irregular Shape ◽  
Two Dimensional ◽  
New Class ◽  
Wide Range ◽  
Two Dimensional Materials ◽  
Tiling Patterns

Recent reports of the synthesis and assembly of faceted nanoplates with a wide range of shapes and composition motivates the possibility of a new class of two-dimensional materials with specific patterns targeted for a host of exciting properties.

scholarly journals Monolayer Nanosheets Formed by Liquid Exfoliation of Charge-as-Sisted Hydrogen-Bonded Frameworks

2020 ◽  
Author(s):  
Josh Nicks ◽  
Stephanie Boer ◽  
Nicholas White ◽  
jonathan Foster
Keyword(s):  
Self Assembly ◽  
Organic Dye ◽  
The Self ◽  
Two Dimensional ◽  
Free Standing ◽  
Liquid Exfoliation ◽  
New Family ◽  
Two Dimensional Materials ◽  
Ultrasound Assisted ◽  
Hydrogen Bonded

Hydrogen-bonded organic frameworks (HOFs) are a diverse and tunable class of materials, but their potential as free-standing two-dimensional nanomaterials has yet to be explored. Here we report the self-assembly of two layered hydrogen-bonded frameworks based on strong, charge-assisted hydrogen-bonding between carboxylate and amidinium groups. Ultrasound-assisted liquid exfoliation of both materials readily produces monolayer hydrogen-bonded organic nanosheets (HONs) with micron-sized lateral dimensions. The HONs show remarkable stability and maintain their extended crystallinity and monolayer structures even after being suspended in water at 80 °C for three days. These systems also exhibit efficient fluorescence quenching of an organic dye in organic solvents, superior to the quenching ability of the bulk frameworks. We anticipate that this approach will provide a route towards a diverse new family of molecular two-dimensional materials with great potential for use in separation, sensing, catalysis, delivery, and electronics materials applications.

scholarly journals Monolayer Nanosheets Formed by Liquid Exfoliation of Charge-as-Sisted Hydrogen-Bonded Frameworks

2020 ◽  
Author(s):  
Josh Nicks ◽  
Stephanie Boer ◽  
Nicholas White ◽  
jonathan Foster
Keyword(s):  
Self Assembly ◽  
Organic Dye ◽  
The Self ◽  
Two Dimensional ◽  
Free Standing ◽  
Liquid Exfoliation ◽  
New Family ◽  
Two Dimensional Materials ◽  
Ultrasound Assisted ◽  
Hydrogen Bonded

Hydrogen-bonded organic frameworks (HOFs) are a diverse and tunable class of materials, but their potential as free-standing two-dimensional nanomaterials has yet to be explored. Here we report the self-assembly of two layered hydrogen-bonded frameworks based on strong, charge-assisted hydrogen-bonding between carboxylate and amidinium groups. Ultrasound-assisted liquid exfoliation of both materials readily produces monolayer hydrogen-bonded organic nanosheets (HONs) with micron-sized lateral dimensions. The HONs show remarkable stability and maintain their extended crystallinity and monolayer structures even after being suspended in water at 80 °C for three days. These systems also exhibit efficient fluorescence quenching of an organic dye in organic solvents, superior to the quenching ability of the bulk frameworks. We anticipate that this approach will provide a route towards a diverse new family of molecular two-dimensional materials with great potential for use in separation, sensing, catalysis, delivery, and electronics materials applications.

scholarly journals Modification of a Single Atom Affects the Physical Properties of Double Fluorinated Fmoc-Phe Derivatives

2021 ◽  
Vol 22 (17) ◽  
pp. 9634
Author(s):  
Moran Aviv ◽  
Dana Cohen-Gerassi ◽  
Asuka A. Orr ◽  
Rajkumar Misra ◽  
Zohar A. Arnon ◽  
...  
Keyword(s):  
Amino Acid ◽  
Physical Properties ◽  
Self Assembly ◽  
Deep Understanding ◽  
Building Blocks ◽  
The Self ◽  
Single Atom ◽  
Supramolecular Organization ◽  
Assembly Process ◽  
Wide Range

Supramolecular hydrogels formed by the self-assembly of amino-acid based gelators are receiving increasing attention from the fields of biomedicine and material science. Self-assembled systems exhibit well-ordered functional architectures and unique physicochemical properties. However, the control over the kinetics and mechanical properties of the end-products remains puzzling. A minimal alteration of the chemical environment could cause a significant impact. In this context, we report the effects of modifying the position of a single atom on the properties and kinetics of the self-assembly process. A combination of experimental and computational methods, used to investigate double-fluorinated Fmoc-Phe derivatives, Fmoc-3,4F-Phe and Fmoc-3,5F-Phe, reveals the unique effects of modifying the position of a single fluorine on the self-assembly process, and the physical properties of the product. The presence of significant physical and morphological differences between the two derivatives was verified by molecular-dynamics simulations. Analysis of the spontaneous phase-transition of both building blocks, as well as crystal X-ray diffraction to determine the molecular structure of Fmoc-3,4F-Phe, are in good agreement with known changes in the Phe fluorination pattern and highlight the effect of a single atom position on the self-assembly process. These findings prove that fluorination is an effective strategy to influence supramolecular organization on the nanoscale. Moreover, we believe that a deep understanding of the self-assembly process may provide fundamental insights that will facilitate the development of optimal amino-acid-based low-molecular-weight hydrogelators for a wide range of applications.

scholarly journals Serotonergic Axons as Fractional Brownian Motion Paths: Insights into the Self-organization of Regional Densities

2019 ◽  
Author(s):  
Skirmantas Janušonis ◽  
Nils Detering ◽  
Ralf Metzler ◽  
Thomas Vojta
Keyword(s):  
Brownian Motion ◽  
Fractional Brownian Motion ◽  
Adult Brain ◽  
The Self ◽  
Self Organization ◽  
Dense Matrix ◽  
Two Dimensional ◽  
Wide Range ◽  
Motion Paths ◽  
Key Features

ABSTRACTAll vertebrate brains contain a dense matrix of thin fibers that release serotonin (5-hydroxytryptamine), a neurotransmitter that modulates a wide range of neural, glial, and vascular processes. Perturbations in the density of this matrix have been associated with a number of mental disorders, including autism and depression, but its self-organization and plasticity remain poorly understood. We introduce a model based on reflected Fractional Brownian Motion (FBM), a rigorously defined stochastic process, and show that it recapitulates some key features of regional serotonergic fiber densities. Specifically, we use supercomputing simulations to model fibers as FBM-paths in two-dimensional brain-like domains and demonstrate that the resultant steady state distributions approximate the fiber distributions in physical brain sections immunostained for the serotonin transporter (a marker for serotonergic axons in the adult brain). We suggest that this framework can support predictive descriptions and manipulations of the serotonergic matrix and that it can be further extended to incorporate the detailed physical properties of the fibers and their environment.

scholarly journals Copper halide diselenium: predicted two-dimensional materials with ultrahigh anisotropic carrier mobilities

RSC Advances ◽  
2020 ◽  
Vol 10 (14) ◽  
pp. 8016-8026 ◽  
Author(s):  
Fazel Shojaei ◽  
Maryam Azizi ◽  
Zabiollah Mahdavifar ◽  
Busheng Wang ◽  
Gilles Frapper
Keyword(s):  
Band Gap ◽  
First Principles ◽  
Two Dimensional ◽  
Copper Halide ◽  
New Class ◽  
Two Dimensional Materials ◽  
Bonding Properties ◽  
High Carrier ◽  
Indirect Band Gap ◽  
Very High

The physical and bonding properties of a new class of two-dimensional materials – CuXSe2 (X = Cl, Br) – are investigated using first-principles methods. 2D CuXSe2 are indirect band gap and possess extremely anisotropic and very high carrier mobilities.

scholarly journals Controlling the Self-Assembly of Biomolecules into Functional Nanomaterials through Internal Interactions and External Stimulations: A Review

Nanomaterials ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 285 ◽  
Author(s):  
Li Wang ◽  
Coucong Gong ◽  
Xinzhu Yuan ◽  
Gang Wei
Keyword(s):  
Self Assembly ◽  
Electrostatic Interactions ◽  
Materials Science ◽  
Hydrophobic Interactions ◽  
The Self ◽  
Functional Nanomaterials ◽  
Light Stimulation ◽  
Dna Base ◽  
Wide Range ◽  
Structure And Functions

Biomolecular self-assembly provides a facile way to synthesize functional nanomaterials. Due to the unique structure and functions of biomolecules, the created biological nanomaterials via biomolecular self-assembly have a wide range of applications, from materials science to biomedical engineering, tissue engineering, nanotechnology, and analytical science. In this review, we present recent advances in the synthesis of biological nanomaterials by controlling the biomolecular self-assembly from adjusting internal interactions and external stimulations. The self-assembly mechanisms of biomolecules (DNA, protein, peptide, virus, enzyme, metabolites, lipid, cholesterol, and others) related to various internal interactions, including hydrogen bonds, electrostatic interactions, hydrophobic interactions, π–π stacking, DNA base pairing, and ligand–receptor binding, are discussed by analyzing some recent studies. In addition, some strategies for promoting biomolecular self-assembly via external stimulations, such as adjusting the solution conditions (pH, temperature, ionic strength), adding organics, nanoparticles, or enzymes, and applying external light stimulation to the self-assembly systems, are demonstrated. We hope that this overview will be helpful for readers to understand the self-assembly mechanisms and strategies of biomolecules and to design and develop new biological nanostructures or nanomaterials for desired applications.

Co-assembly of helical β3-peptides: a self-assembled analogue of a statistical copolymer

2017 ◽  
Vol 89 (12) ◽  
pp. 1809-1816 ◽  
Author(s):  
Claire Buchanan ◽  
Christopher J. Garvey ◽  
Patrick Perlmutter ◽  
Adam Mechler
Keyword(s):  
Amino Acids ◽  
Physical Properties ◽  
Self Assembly ◽  
Unnatural Amino Acids ◽  
The Self ◽  
Microscopy Imaging ◽  
Wide Range ◽  
Self Assembled ◽  
Unnatural Peptides ◽  
Natural Amino Acids

AbstractUnnatural peptide self-assembly offers the means to design hierarchical nanostructures of controlled geometries, chemical function and physical properties. N-acyl β3 peptides, where all residues are unnatural amino acids, are able to form helical fibrous structures by a head-to-tail assembly of helical monomers, extending the helix via a three point supramolecular hydrogen bonding motif. These helical nanorods were shown to be stable under a wide range of physical conditions, offering a self-assembled analogue of polymeric fibres. Hitherto the self-assembly has only been demonstrated between identical monomers; however the self-assembly motif is sequence-independent, offering the possibility of hetero-assembly of different peptide monomers. Here we present a proof of principle study of head-to-tail co-assembly of two different helical unnatural peptides Ac-β3[WELWEL] and Ac-β3[LIA], where the letters denote the β3 analogues of natural amino acids. By atomic force microscopy imaging it was demonstrated that the homo-assembly and co-assembly of these peptides yield characteristically different structures. Synchrotron small angle X-ray scattering experiments have confirmed the presence of the fibres in the solution and the averaged diameters from modelled data correlate well to the results of AFM imaging. Hence, there is evidence of co-assembly of the fibrous superstructures; given that different monomers may be used to introduce variations into chemical and physical properties, the results demonstrate a self-assembled analogue of a statistical co-polymer that can be used in designing complex functional nanomaterials.

Self-assembled atomically thin hybrid conjugated polymer perovskites with two-dimensional structure

2018 ◽  
Vol 6 (31) ◽  
pp. 8405-8410 ◽  
Author(s):  
Furkan H. Isikgor ◽  
Chilla Damodara Reddy ◽  
Mengsha Li ◽  
Hikmet Coskun ◽  
Bichen Li ◽  
...  
Keyword(s):  
Self Assembly ◽  
Conjugated Polymer ◽  
The Self ◽  
Dimensional Structure ◽  
Two Dimensional ◽  
Self Assembled

2D hybrid perovskites are formed through the self assembly of polyaniline with PbI6 octahedra.

scholarly journals Monolayer Graphene Can Emit SHG Waves

2017 ◽  
Vol 3 (1) ◽  
Author(s):  
David N. Carvalho ◽  
Fabio Biancalana ◽  
Andrea Marini
Keyword(s):  
Dirac Equation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Normal Incidence ◽  
Monolayer Graphene ◽  
Harmonic Waves ◽  
Two Dimensional ◽  
Wide Range ◽  
Two Dimensional Materials ◽  
Breaking Mechanism

AbstractThe usually-held notion that monolayer graphene, a centrosymmetric system, does not allow even-harmonic generation when illuminated at normal incidence is challenged by the discovery of a peculiar effect we term the dynamical centrosymmetry breaking mechanism. This effect results in a global pulse-induced oscillation of the Dirac cones which in turn produces second harmonic waves. We prove that this result can only be found by using the full Dirac equation and show that the widely used semiconductor Bloch equations fail to reproduce this and some other important physics of graphene. These results clear the way for further investigation concerning nonlinear light-matter interactions in a wide range of two-dimensional materials admitting either a gapped or ungapped Dirac-like spectrum.

Sign in / Sign up

Export Citation Format

Share Document