scholarly journals Self-Assembly, Nematic Phase Formation, and Organocatalytic Behavior of a Proline-Functionalized Lipopeptide

2020 ◽  
Vol 12 (12) ◽  
pp. 13671-13679
Author(s):  
Juliane N.B.D. Pelin ◽  
Charlotte J. C. Edwards-Gayle ◽  
Valeria Castelletto ◽  
Andrea M. Aguilar ◽  
Wendel A. Alves ◽  
...  
Keyword(s):  
Phase Formation ◽  
Self Assembly ◽  
Nematic Phase

Self-Assembly of a Modified Amyloid Peptide Fragment: pH-Responsiveness and Nematic Phase Formation

2010 ◽  
Vol 10 (1) ◽  
pp. 40-48 ◽  
Author(s):  
Ian W. Hamley ◽  
Valeria Castelletto ◽  
Claire Moulton ◽  
Daniel Myatt ◽  
Giuliano Siligardi ◽  
...  
Keyword(s):  
Phase Formation ◽  
Self Assembly ◽  
Nematic Phase ◽  
Amyloid Peptide ◽  
Peptide Fragment

Reversible microscale assembly of nanoparticles driven by the phase transition of a thermotropic liquid crystal

2017 ◽  
Author(s):  
Niamh Mac Fhionnlaoich ◽  
Stephen Schrettl ◽  
Nicholas B. Tito ◽  
Ye Yang ◽  
Malavika Nair ◽  
...  
Keyword(s):  
Phase Transition ◽  
Liquid Crystal ◽  
Self Assembly ◽  
Nematic Phase ◽  
Hierarchical Control ◽  
Building Blocks ◽  
Model System ◽  
Microscopic Level ◽  
Reversible Process ◽  
Thermotropic Liquid Crystal

The arrangement of nanoscale building blocks into patterns with microscale periodicity is challenging to achieve via self-assembly processes. Here, we report on the phase transition-driven collective assembly of gold nanoparticles in a thermotropic liquid crystal. A temperature-induced transition from the isotropic to the nematic phase leads to the assembly of individual nanometre-sized particles into arrays of micrometre-sized aggregates, whose size and characteristic spacing can be tuned by varying the cooling rate. This fully reversible process offers hierarchical control over structural order on the molecular, nanoscopic, and microscopic level and is an interesting model system for the programmable patterning of nanocomposites with access to micrometre-sized periodicities.

scholarly journals Self-ordered cellulose nanocrystals and microscopic investigations

2021 ◽  
Vol 0 (0) ◽  
Author(s):  
C.F. Castro-Guerrero ◽  
A.B. Morales-Cepeda ◽  
M.R. Díaz-Guillén ◽  
F. Delgado-Arroyo ◽  
F.A. López-González
Keyword(s):  
Cellulose Nanocrystals ◽  
Self Assembly ◽  
Nematic Phase ◽  
Average Length ◽  
Periodic Change ◽  
Local Orientation ◽  
Preferred Direction ◽  
Self Assembling ◽  
Chiral Nematic ◽  
Assembly Structure

Abstract Cellulose nanocrystals were extracted from cotton. The cellulose nanocrystals made a self-assembly structure when dried under slow conditions, as it was revealed by the characterization made to the material. The AFM images of the nanocrystals showed that they had a changing local orientation, pointing in a preferred direction that underwent a periodic change. This periodic change resembles the orientation of a chiral nematic phase. The TEM images showed that the nanocrystals had a rod-like appearance with average length size of 98.5 nm and a diameter of 4.7 nm. The TEM characterization showed the nanocrystals with more details than AFM. In this paper, the self-assembling of CNC was observed by AFM, and further investigations were done by TEM, deconvoluting the process of CNC nanorods aggregation.

Computer Simulation of Self-Assembly of Disc-Shaped Nanoparticles

2013 ◽  
Vol 710 ◽  
pp. 716-719
Author(s):  
Bo Du ◽  
Zi Lu Wang ◽  
Xue Hao He
Keyword(s):  
Computer Simulation ◽  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Simulated Annealing ◽  
Formation Mechanism ◽  
Self Assembly ◽  
Nematic Phase ◽  
The Self ◽  
Isotropic Phase ◽  
Shaped Nanoparticles

Understanding how nanoparticles self-assemble into specific structures is important in biology. The self-assembly structures of disc-shaped nanoparticles are investigated using Gay Berne potential. Through the simulated annealing Monte Carlo simulation underNVTcondition, we found that various nanostructures such as nematic phase and isotropic phase are discovered. The formation mechanism of these novel nanostructures is discussed.

scholarly journals Synthesis and characteristics of novel azo-based diblock copolymers and their self-assembly behavior via solvents and thermal annealing

e-Polymers ◽  
2017 ◽  
Vol 17 (6) ◽  
pp. 523-535 ◽  
Author(s):  
Athmen Zenati ◽  
Yang-Kyoo Han
Keyword(s):  
Self Assembly ◽  
Nematic Phase ◽  
Weight Control ◽  
Liquid Crystalline ◽  
Diblock Copolymers ◽  
Raft Polymerization ◽  
Gel Permeation Chromatography ◽  
Kinetic Studies ◽  
Morphological Properties ◽  
Scanning Calorimetry

AbstractA series of azo-based diblock copolymers (DBCs) with various compositions were successfully synthesized via reversible addition-fragmentation chain transfer (RAFT) polymerization in anisole with PCAEMA-CTA (macro-CTA), DOPAM (new acrylamide monomer) and AIBN (initiator). Kinetic studies on diblock copolymerization manifested a controlled/living manner with good molecular weight control. Structures and properties of monomers and DBCs were determined by 1H nuclear magnetic resonance (NMR), differential scanning calorimetry (DSC) and gel permeation chromatography (GPC). Liquid crystalline (LC) phases and morphological properties were investigated using optical polarizing microscope (OPM), atomic force microscopy (AFM), scanning electron microscopy (SEM) and small-angle X-ray scattering (SAXS). Experimental results demonstrated that the prepared PCAEMA-CTA and DBCs possessed low polydispersity index (≤1.37). All DBCs revealed sharp endothermic transition peaks corresponding to the smectic-to-nematic phase. DBCs with high azo contents showed batonnet textures of the smectic phase whereas DBCs of low azo segments displayed threaded textures of the nematic phase. DBC with 49 wt% of azo side-chains generated a lamellar compared to DBCs with low azo block (≤41 wt%) or non-azo block (≤38 wt%) which produced hexagonal-type nanostructures. In addition, all DBCs exhibited reversible trans-cis photoisomerization behavior under UV irradiation and dark storage at different intervals of time.

Self-assembly of an amyloid peptide fragment–PEG conjugate: lyotropic phase formation and influence of PEG crystallization

2010 ◽  
Vol 1 (4) ◽  
pp. 453 ◽  
Author(s):  
V. Castelletto ◽  
G. E. Newby ◽  
D. Hermida Merino ◽  
I. W. Hamley ◽  
D. Liu ◽  
...  
Keyword(s):  
Phase Formation ◽  
Self Assembly ◽  
Amyloid Peptide ◽  
Peptide Fragment

Self-assembly of mesogenic bent-core DNA nanoduplexes

Soft Matter ◽  
2015 ◽  
Vol 11 (15) ◽  
pp. 2934-2944 ◽  
Author(s):  
Khanh Thuy Nguyen ◽  
Anna Battisti ◽  
Daniele Ancora ◽  
Francesco Sciortino ◽  
Cristiano De Michele
Keyword(s):  
Phase Boundary ◽  
Self Assembly ◽  
Nematic Phase ◽  
Sequence Dependence

Modelling DNA nanoduplexes as bent-core mesogens explains the sequence dependence of the isotropic–nematic phase boundary.

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