2-Aminopyrimidine-Silver(I) Based Hybrid Organic Polymers: Self-Assembly and Phase Transitions of a Novel Class of Electronic Material

2010 ◽  
Vol 22 (16) ◽  
pp. 4749-4755 ◽  
Author(s):  
Ion Stoll ◽  
Regina Brockhinke ◽  
Andreas Brockhinke ◽  
Markus Böttcher ◽  
Thomas Koop ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Electronic Material ◽  
Self Assembly ◽  
Organic Polymers

scholarly journals Nanospheres to Nanosheets: Unfolding the Morphological Influence of Microporous Organic Polymers on Micropollutants Removal

2021 ◽  
Author(s):  
ARKAPRABHA GIRI ◽  
Subha Biswas ◽  
Tapas Dutta ◽  
MD. WASEEM HUSSAIN ◽  
Abhijit Patra
Keyword(s):  
Specific Surface ◽  
Self Assembly ◽  
Environmental Remediation ◽  
High Specific Surface Area ◽  
Organic Polymers ◽  
Organic Micropollutants ◽  
Water Solvent ◽  
Formidable Challenge ◽  
Antibiotic Drugs ◽  
Microscopic Studies

<p>Nanoporous organic polymers with distinct morphologies are of immense interest for a broad spectrum of applications ranging from catalysis to molecular separation, energy storage, and energy conversion. However, developing facile and versatile methodologies to obtain well-orchestrated morphologies along with high specific surface area pertinent to a specific application is still a formidable challenge. The design of the task-specific networks can be benefitted through further analysis of subtle variations in the polymerization conditions. Herein, we have critically examined the fabrication of triptycene-based hypercrosslinked polymers (HCPs), exhibiting contrasting morphologies developed through three distinct polymerization routes. Astonishingly, a remarkable variation of nanostructured morphology of irregular aggregates, nanospheres, and nanosheets was noticeable in the resultant network polymers through Friedel-Crafts crosslinking using dimethoxymethane as an external crosslinker, Scholl coupling, and solvent knitting using dichloromethane as an external crosslinker and solvent, respectively. The dramatic role of reaction temperature, catalysts, and solvents driving the formation of specific nanostructured HCPs was elucidated. Mechanistic investigations coupled with spectroscopic and microscopic studies revealed that the 2D-nanosheets of highly porous solvent-knitted HCP (SKTP, S<sub>BET</sub>: 2385 m<sup>2</sup> g<sup>-1</sup>) evolved through the hierarchical self-assembly of rigid nanospheres into nanoribbons followed by the formation of nanosheets. We further demonstrated a structure-activity correlation of the pristine as well as post-synthetically sulfonated HCPs for the removal of a gamut of organic micropollutants from water. Solvent knitted triptycene polymer (SKTP) and its sulfonated derivative (SKTPS, S<sub>BET</sub>: 1444 m<sup>2</sup> g<sup>-1</sup>) owing to high specific surface areas, excellent dispersity in water, and better accessibility of analytes through 2D-sheet like morphology exhibited ultrafast sequestration (30 s to 5 min) of an extensive array of persistent organic micropollutants, including ionic dyes, plastic components, steroids, antibiotic drugs, and herbicides with excellent recyclability. The current study holds the promise that a delicate control over the morphologies of nanoporous polymers by tuning the fabrication conditions paves the way for the development of advanced porous materials for environmental remediation.</p>

Structural Phase Transitions of Molecular Self-Assembly Driven by Nonbonded Metal Adatoms

ACS Nano ◽  
2020 ◽  
Vol 14 (5) ◽  
pp. 6331-6338 ◽  
Author(s):  
Shichao Li ◽  
Sai Duan ◽  
Zeqi Zha ◽  
Jinliang Pan ◽  
Luye Sun ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Self Assembly ◽  
Structural Phase ◽  
Structural Phase Transitions

Reaction-induced phase transitions with block copolymers in solution and bulk

2021 ◽  
Vol 12 (1) ◽  
pp. 12-28 ◽  
Author(s):  
Joshua Lequieu ◽  
Andrew J. D. Magenau
Keyword(s):  
Phase Transitions ◽  
Block Copolymers ◽  
Chemical Reactions ◽  
Self Assembly

Reaction-induced phase transitions use chemical reactions to drive macromolecular organisation and self-assembly. This review highlights significant and recent advancements in this burgeoning field.

scholarly journals Mechano-responsive polymer solutions based on CO2 supersaturation: shaking-induced phase transitions and self-assembly or dissociation of polymeric nanoparticles

2014 ◽  
Vol 50 (67) ◽  
pp. 9561-9564 ◽  
Author(s):  
Peter J. Roth ◽  
Jing Yang Quek ◽  
Yicheng Zhu ◽  
Bianca M. Blunden ◽  
Andrew B. Lowe
Keyword(s):  
Phase Transitions ◽  
Self Assembly ◽  
Polymer Solutions ◽  
Polymeric Nanoparticles ◽  
Nanoparticle Formation ◽  
Soda Water ◽  
Responsive Polymer

Shaking solutions of tailored (co)polymers in soda water is shown to induce precipitation, nanoparticle formation, or polymer or nanoparticle dissolution.

scholarly journals Shape-driven solid–solid transitions in colloids

2017 ◽  
Vol 114 (20) ◽  
pp. E3892-E3899 ◽  
Author(s):  
Chrisy Xiyu Du ◽  
Greg van Anders ◽  
Richmond S. Newman ◽  
Sharon C. Glotzer
Keyword(s):  
Phase Transitions ◽  
Self Assembly ◽  
Thermal Activation ◽  
Colloidal Particles ◽  
Solid Phase ◽  
Control Variable ◽  
Fluid Phase ◽  
Model Systems ◽  
Coordination Polyhedra ◽  
System A

Solid–solid phase transitions are the most ubiquitous in nature, and many technologies rely on them. However, studying them in detail is difficult because of the extreme conditions (high pressure/temperature) under which many such transitions occur and the high-resolution equipment needed to capture the intermediate states of the transformations. These difficulties mean that basic questions remain unanswered, such as whether so-called diffusionless solid–solid transitions, which have only local particle rearrangement, require thermal activation. Here, we introduce a family of minimal model systems that exhibits solid–solid phase transitions that are driven by changes in the shape of colloidal particles. By using particle shape as the control variable, we entropically reshape the coordination polyhedra of the particles in the system, a change that occurs indirectly in atomic solid–solid phase transitions via changes in temperature, pressure, or density. We carry out a detailed investigation of the thermodynamics of a series of isochoric, diffusionless solid–solid phase transitions within a single shape family and find both transitions that require thermal activation or are “discontinuous” and transitions that occur without thermal activation or are “continuous.” In the discontinuous case, we find that sufficiently large shape changes can drive reconfiguration on timescales comparable with those for self-assembly and without an intermediate fluid phase, and in the continuous case, solid–solid reconfiguration happens on shorter timescales than self-assembly, providing guidance for developing means of generating reconfigurable colloidal materials.

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