Formation mechanism of rod-like ZIF-L and fast phase transformation from ZIF-L to ZIF-8 with morphology changes controlled by polyvinylpyrrolidone and ethanol

CrystEngComm ◽  
2018 ◽  
Vol 20 (11) ◽  
pp. 1473-1477 ◽  
Author(s):  
Huifen Fu ◽  
Zhihua Wang ◽  
Xun Wang ◽  
Peng Wang ◽  
Chong-Chen Wang
Keyword(s):  
Phase Transformation ◽  
Formation Mechanism ◽  
Self Assembly ◽  
Fast Phase ◽  
Assembly Mechanism ◽  
Washing Solvent ◽  
Morphology Changes

Rod-like ZIF-L was formed through a self-assembly mechanism, and phase transformation from ZIF-L to ZIF-8 occurred once ethanol was used as the washing solvent.

Photoluminescent organic polymer nanofilms formed in water through a self-assembly formation mechanism

2019 ◽  
Vol 7 (11) ◽  
pp. 3286-3293 ◽  
Author(s):  
Baoxi Feng ◽  
Zhen Xu ◽  
Jiayu Wang ◽  
Fei Feng ◽  
Lin Wang ◽  
...  
Keyword(s):  
Molecular Dynamics ◽  
Molecular Dynamics Simulations ◽  
Real Time ◽  
Formation Mechanism ◽  
Self Assembly ◽  
Organic Polymer ◽  
Assembly Mechanism ◽  
Real Time Visualization ◽  
Dynamics Simulations

A self-assembly mechanism is demonstrated for the formation of polymer nanofilms based on real-time visualization and molecular dynamics simulations.

THEORY–EXPERIMENT RELATIONSHIP OF THE "SHRINKING HOT GIANT" ROAD OF DYNAMIC FULLERENE SELF-ASSEMBLY IN HOT CARBON VAPOR

NANO ◽  
2007 ◽  
Vol 02 (01) ◽  
pp. 21-30 ◽  
Author(s):  
S. IRLE ◽  
G. ZHENG ◽  
Z. WANG ◽  
K. MOROKUMA
Keyword(s):  
Formation Mechanism ◽  
Self Assembly ◽  
Density Functional ◽  
Dissipative Structures ◽  
Model Systems ◽  
Irreversible Processes ◽  
Fullerene Cage ◽  
Carbon Vapor ◽  
Assembly Mechanism ◽  
Cage Size

Though subject to intensive studies, the formation mechanism of buckminsterfullerene C 60 and related higher fullerenes has long evaded discovery. To elucidate their atomistic self-assembly mechanism, we have performed high-temperature quantum chemical molecular dynamics simulations on carbon vapor model systems initially consisting of C 2 molecules. Our simulations reveal a coherent mechanism how highly ordered fullerene cages naturally self-assemble under nonequilibrium conditions, following a series of irreversible processes from the polymerization of C 2 molecules to vibrationally excited giant fullerenes, which then shrink by C 2 evaporation down to the smallest spherical, isolated pentagon rule obeying species C 70 and C 60 as the smallest and kinetically most stable species of the shrinking process. We show that the potential energy surface associated with giant fullerene cage growth, measured by an average cluster curvature, is downhill all the way, and in agreement with high-level energetics from density functional theory. This fullerene formation mechanism is a good example of dynamic self-assembly leading to dissipative structures far from thermodynamic equilibrium, and the "shrinking hot giant" road provides a natural explanation for the observed cage size distributions in a random optimization process consistent with several important experimental observations.

Cooperative Self-Assembly of Pyridine-2,6-Diimine-Linked Macrocycles into Mechanically Robust Nanotubes

2019 ◽  
Author(s):  
Michael J. Strauss ◽  
Darya Asheghali ◽  
Austin Evans ◽  
Rebecca Li ◽  
Anton Chavez ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Self Assembly ◽  
Gel Permeation Chromatography ◽  
Synthetic Polymers ◽  
Young’S Moduli ◽  
Structural Rigidity ◽  
Assembly Mechanism ◽  
Low Dimensionality ◽  
Harsh Conditions

<p>Nanotubes assembled from macrocyclic precursors offer a unique combination of low dimensionality, structural rigidity, and distinct interior and exterior microenvironments. Usually the weak stacking energies of macrocycles limit the length or strength of the resultant nanotubes. Imine-linked macrocycles were recently found to assemble into high-aspect ratio (>10<sup>3</sup>), lyotropic nanotubes in the presence of excess acid. Yet these harsh conditions are incompatible with many functional groups and processing methods, and lower acid loadings instead catalyze macrocycle degradation. Here we report pyridine-2,6-diimine-linked macrocycles that assemble into high-aspect ratio nanotubes in the presence of less than 1 equiv of CF<sub>3</sub>CO<sub>2</sub>H per macrocycle. Analysis by gel permeation chromatography and fluorescence spectroscopy revealed a cooperative self-assembly mechanism. Nanofibers obtained by touch-spinning the pyridinium-based nanotubes exhibit Young’s moduli of 1.48 GPa, which exceeds that of many synthetic polymers and biological filaments. These findings will enable the design of structurally diverse nanotubes from synthetically accessible macrocycles. </p>

scholarly journals Millimeter-Scale Zn(3-ptz)2 Metal–Organic Framework Single Crystals: Self-Assembly Mechanism and Growth Kinetics

ACS Omega ◽  
2021 ◽  
Author(s):  
Juan M. Garcia-Garfido ◽  
Javier Enríquez ◽  
Ignacio Chi-Durán ◽  
Iván Jara ◽  
Leonardo Vivas ◽  
...  
Keyword(s):  
Single Crystals ◽  
Growth Kinetics ◽  
Self Assembly ◽  
Metal Organic Framework ◽  
Assembly Mechanism ◽  
Metal Organic ◽  
Organic Framework

Room temperature synthesis of flower-like CaCO3 architectures

2016 ◽  
Vol 40 (1) ◽  
pp. 571-577 ◽  
Author(s):  
Lu-feng Yang ◽  
De-qing Chu ◽  
Hui-lou Sun ◽  
Ge Ge
Keyword(s):  
Self Assembly ◽  
Room Temperature ◽  
Temperature Synthesis ◽  
Room Temperature Synthesis ◽  
Assembly Mechanism

A proposed hierarchical self-assembly mechanism of the formation of flower-like vaterite superstructures.

scholarly journals Lanthanide Homobimetallic Triple-Stranded Helicates: Insight into the Self-Assembly Mechanism

2004 ◽  
Vol 2004 (1) ◽  
pp. 51-62 ◽  
Author(s):  
Mourad Elhabiri ◽  
Josef Hamacek ◽  
Jean-Claude G. Bünzli ◽  
Anne-Marie Albrecht-Gary
Keyword(s):  
Self Assembly ◽  
The Self ◽  
Assembly Mechanism ◽  
Insight Into

scholarly journals The assembly of microtubule protein in vitro. The kinetic role in microtubule elongation of oligomeric fragments containing microtubule-associated proteins

1985 ◽  
Vol 227 (2) ◽  
pp. 439-455 ◽  
Author(s):  
P M Bayley ◽  
F M M Butler ◽  
D C Clark ◽  
E J Manser ◽  
S R Martin
Keyword(s):  
Self Assembly ◽  
Protein Concentration ◽  
Wavelength Dependence ◽  
Electrophoretic Analysis ◽  
Slow Phase ◽  
Condensation Polymerization ◽  
Fast Phase ◽  
Microtubule Protein ◽  
Kinetics Of

The kinetics of assembly were studied for bovine and pig microtubule protein in vitro over a range of conditions of pH, temperature, nucleotide and protein concentration. The kinetics are in general biphasic with two major processes of similar amplitude but separated in rate by one order of magnitude. Rates and amplitudes are complex functions of solution conditions. The rates of the fast phase and the slow phase attain limiting values as a function of increasing protein concentration, and are more stringently limited at pH 6.5 than pH 6.95. Such behaviour indicates that mechanisms other than the condensation polymerization of tubulin dimer become rate-limiting at higher protein concentration. The constancy of the wavelength-dependence of light-scattering and ultrastructural criteria indicate that microtubules of normal morphology are formed in both phases of the assembly process. Electrophoretic analysis of assembling microtubule protein shows that MAP- (microtubule-associated-protein-)rich microtubules are formed during the fast phase. The rate of dissociation of oligomeric species on dilution of microtubule protein closely parallels the fast-phase rate in magnitude and temperature-dependence. We propose that the rate of this process constitutes an upper limit to the rate of the fast phase of assembly. The kinetics of redistribution of MAPs from MAP-rich microtubules may be a factor limiting the slow-phase rate. A working model is derived for the self-assembly of microtubule protein incorporating the dissociation and redistribution mechanisms that impose upper limits to the rates of assembly attainable by bimolecular addition reactions. Key roles are assigned to MAP-containing fragments in both phases of microtubule elongation. Variations in kinetic behaviour with solution conditions are inferred to derive from the nature and properties of fragments formed from oligomeric species after the rapid temperature jump. The model accounts for the limiting rate behaviour and indicates experimental criteria to be applied in evaluating the relative contributions of alternative pathways.

scholarly journals Self-assembly mechanism based on charge density topological interaction energies

2017 ◽  
Vol 29 (3) ◽  
pp. 703-713 ◽  
Author(s):  
Błażej Dziuk ◽  
Christopher G. Gianopoulos ◽  
Krzysztof Ejsmont ◽  
Bartosz Zarychta
Keyword(s):  
Charge Density ◽  
Self Assembly ◽  
Interaction Energies ◽  
Assembly Mechanism ◽  
Topological Interaction
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