scholarly journals Hydrogen-Bond-Driven Chemical Separations: Elucidating the Interfacial Steps of Self-Assembly in Solvent Extraction

2020 ◽  
Vol 12 (28) ◽  
pp. 32119-32130 ◽  
Author(s):  
Azhad U. Chowdhury ◽  
Lu Lin ◽  
Benjamin Doughty
Keyword(s):  
Hydrogen Bond ◽  
Solvent Extraction ◽  
Self Assembly ◽  
Chemical Separations

scholarly journals Hydrogen-Bond Driven Chemical Separations: Elucidating the Inter-facial Steps of Self-Assembly in Solvent Extraction

2020 ◽  
Author(s):  
Azhad U. Chowdhury ◽  
Lu Lin ◽  
Benjamin Doughty
Keyword(s):  
Hydrogen Bond ◽  
Solvent Extraction ◽  
Aqueous Phase ◽  
Self Assembly ◽  
Micelle Formation ◽  
Interfacial Structure ◽  
Interfacial Phenomena ◽  
Time Resolved ◽  
Sum Frequency ◽  
Chemical Separations

Chemical separations, particularly liquid extractions, are pervasive in academic and industrial laboratories, yet a mechanistic understanding of the events governing their function are obscured by interfacial phenomena that are notoriously difficult to measure. In this work, we investigate the fundamental steps of ligand self-assembly as driven by changes in the interfacial H-bonding network using vibrational sum frequency generation. Our results show how the bulk pH modulates the interfacial structure of extractants at the buried oil/aqueous interface via the formation of unique H-bonding networks that order and bridge ligands to produce self-assembled aggregates. These extended H-bonded structures are key to the subsequent extraction of Co<sup>2+</sup> from the aqueous phase in promoting micelle formation and subsequent ejection of said micelle into the oil phase. The combination of static and time resolved measurements reveals the mechanisms underlying complexities of liquid extractions at high [Co<sup>2+</sup>]:[DEHPA] ratios by showing an evolution of interfacially assembled structures that are readily tuned on a chemical basis by altering the compositions of the aqueous phase. The results of this work point to new mechanistic principles to <i>design</i> separations through the manipulation of surface charge, electrostatic screening, and the associated H-bonding networks that arise at the interface to facilitate organization and subsequent extraction

scholarly journals Hydrogen-Bond Driven Chemical Separations: Elucidating the Inter-facial Steps of Self-Assembly in Solvent Extraction

2020 ◽  
Author(s):  
Azhad U. Chowdhury ◽  
Lu Lin ◽  
Benjamin Doughty
Keyword(s):  
Hydrogen Bond ◽  
Solvent Extraction ◽  
Aqueous Phase ◽  
Self Assembly ◽  
Micelle Formation ◽  
Interfacial Structure ◽  
Interfacial Phenomena ◽  
Time Resolved ◽  
Sum Frequency ◽  
Chemical Separations

Chemical separations, particularly liquid extractions, are pervasive in academic and industrial laboratories, yet a mechanistic understanding of the events governing their function are obscured by interfacial phenomena that are notoriously difficult to measure. In this work, we investigate the fundamental steps of ligand self-assembly as driven by changes in the interfacial H-bonding network using vibrational sum frequency generation. Our results show how the bulk pH modulates the interfacial structure of extractants at the buried oil/aqueous interface via the formation of unique H-bonding networks that order and bridge ligands to produce self-assembled aggregates. These extended H-bonded structures are key to the subsequent extraction of Co<sup>2+</sup> from the aqueous phase in promoting micelle formation and subsequent ejection of said micelle into the oil phase. The combination of static and time resolved measurements reveals the mechanisms underlying complexities of liquid extractions at high [Co<sup>2+</sup>]:[DEHPA] ratios by showing an evolution of interfacially assembled structures that are readily tuned on a chemical basis by altering the compositions of the aqueous phase. The results of this work point to new mechanistic principles to <i>design</i> separations through the manipulation of surface charge, electrostatic screening, and the associated H-bonding networks that arise at the interface to facilitate organization and subsequent extraction

Heptacoordinate Dimethyltin(IV)cupferronato Complexes − X-ray and Solid-State NMR Structural Analysis − Hydrogen Bond Supramolecular Self-Assembly

2001 ◽  
Vol 2001 (11) ◽  
pp. 2849 ◽  
Author(s):  
Andrea Deák ◽  
Lajos Radics ◽  
Alajos Kálmán ◽  
László Párkányi ◽  
Ionel Haiduc
Keyword(s):  
Hydrogen Bond ◽  
Solid State ◽  
Structural Analysis ◽  
Self Assembly ◽  
Solid State Nmr ◽  
X Ray

scholarly journals Crystalline modification of a rare earth nucleating agent for isotactic polypropylene based on its self-assembly

2018 ◽  
Vol 5 (5) ◽  
pp. 180247 ◽  
Author(s):  
Yuanming Zhang ◽  
Tingting Sun ◽  
Wei Jiang ◽  
Guangting Han
Keyword(s):  
Hydrogen Bond ◽  
Rare Earth ◽  
Isotactic Polypropylene ◽  
Self Assembly ◽  
Dendritic Structure ◽  
Nucleating Agent ◽  
The Self ◽  
Structure Evolution ◽  
Crystalline Modification ◽  
Assembly Structure

In this paper, the crystalline modification of a rare earth nucleating agent (WBG) for isotactic polypropylene (PP) based on its supramolecular self-assembly was investigated by differential scanning calorimetry, wide-angle X-ray diffraction and polarized optical microscopy. In addition, the relationship between the self-assembly structure of the nucleating agent and the crystalline structure, as well as the possible reason for the self-assembly behaviour, was further studied. The structure evolution of WBG showed that the self-assembly structure changed from a needle-like structure to a dendritic structure with increase in the content of WBG. When the content of WBG exceeded a critical value (0.4 wt%), it self-assembled into a strip structure. This revealed that the structure evolution of WBG contributed to the K β and the crystallization morphology of PP with different content of WBG. In addition, further studies implied that the behaviour of self-assembly was a liquid–solid transformation of WBG, followed by a liquid–liquid phase separation of molten isotactic PP and WBG. The formation of the self-assembly structure was based on the free molecules by hydrogen bond dissociation while being heated, followed by aggregation into another structure by hydrogen bond association while being cooled. Furthermore, self-assembly behaviour depends largely on the interaction between WBG themselves.

Hydrogen bond-driven columnar self-assembly of electroluminescent D–A–D configured cyanopyridones

2018 ◽  
Vol 6 (27) ◽  
pp. 7385-7399 ◽  
Author(s):  
D. R. Vinayakumara ◽  
Hidayath Ulla ◽  
Sandeep Kumar ◽  
Anup Pandith ◽  
M. N. Satyanarayan ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Self Assembly ◽  
Optoelectronic Properties

Flying bird-shaped cyanopyridone-based mesogens were designed and synthesized; their optoelectronic properties were studied in detail.

Hydrogen bond mediated self‐assembly of two diblock copolymers

2020 ◽  
Vol 58 (21) ◽  
pp. 3061-3068
Author(s):  
Eric R. Anderson ◽  
Vikram K. Daga ◽  
Samuel P. Gido ◽  
James J. Watkins
Keyword(s):  
Hydrogen Bond ◽  
Self Assembly ◽  
Diblock Copolymers

scholarly journals Hydrogen bond guided synthesis of close-packed one-dimensional graphdiyne on the Ag(111) surface

2019 ◽  
Vol 10 (47) ◽  
pp. 10849-10852 ◽  
Author(s):  
Zhi Chen ◽  
Tao Lin ◽  
Haohan Li ◽  
Fang Cheng ◽  
Chenliang Su ◽  
...  
Keyword(s):  
Hydrogen Bond ◽  
Hydrogen Bonding ◽  
Self Assembly ◽  
One Dimensional

Aided by hydrogen bonding, alkyne and oxazole functionalized precursors undergo uniform self-assembly, which serves as a template for the fabrication of one-dimensional graphdiyne-like wires on the Ag(111) surface.

Solvent extraction and self-assembly of nanosized aggregates of p-tert-butyl thiacalix[4]arenes tetrasubstituted at the lower rim by tertiary amide groups and monocharged metal cations in the organic phase

Tetrahedron ◽  
2008 ◽  
Vol 64 (32) ◽  
pp. 7489-7497 ◽  
Author(s):  
Ivan I. Stoikov ◽  
Elena A. Yushkova ◽  
Arkadiy Yu. Zhukov ◽  
Ilya Zharov ◽  
Igor S. Antipin ◽  
...  
Keyword(s):  
Solvent Extraction ◽  
Organic Phase ◽  
Self Assembly ◽  
Metal Cations ◽  
Tert Butyl ◽  
Tertiary Amide
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