Kinetic Pathways for Polyelectrolyte Coacervate Micelle Formation Revealed by Time-Resolved Synchrotron SAXS

2019 ◽  
Vol 52 (21) ◽  
pp. 8227-8237 ◽  
Author(s):  
Matthias Amann ◽  
Jakob Stensgaard Diget ◽  
Jeppe Lyngsø ◽  
Jan Skov Pedersen ◽  
Theyencheri Narayanan ◽  
...  
Keyword(s):  
Micelle Formation ◽  
Time Resolved ◽  
Synchrotron Saxs

scholarly journals Lamellar structure change of waxy corn starch during gelatinization by time-resolved synchrotron SAXS

2017 ◽  
Vol 62 ◽  
pp. 43-48 ◽  
Author(s):  
Qirong Kuang ◽  
Jinchuan Xu ◽  
Yongri Liang ◽  
Fengwei Xie ◽  
Feng Tian ◽  
...  
Keyword(s):  
Lamellar Structure ◽  
Corn Starch ◽  
Structure Change ◽  
Time Resolved ◽  
Waxy Corn Starch ◽  
Waxy Corn ◽  
Synchrotron Saxs

Monitoring Supramolecular Self-Assembly using Time-Resolved Fluorescence Spectroscopy

2011 ◽  
Vol 64 (6) ◽  
pp. 825 ◽  
Author(s):  
Scott C. McLean ◽  
Colin A. Scholes ◽  
Trevor A. Smith ◽  
Michelle L. Gee
Keyword(s):  
Fluorescence Spectroscopy ◽  
Self Assembly ◽  
Supramolecular Structure ◽  
Micelle Formation ◽  
Fluorescence Decay ◽  
Distribution Analysis ◽  
Time Resolved Fluorescence ◽  
Decay Kinetics ◽  
Time Resolved ◽  
Relative Population

Time-resolved fluorescence spectroscopy is used to observe subtleties in supramolecular structure during the self-assembly of polymers in solution. Lifetime distribution analysis of the fluorescence decay kinetics of the solvent-sensitive fluorescent probe 1-anilino-8-naphthalene sulfonic acid associated with the di-block copolymer poly(2-vinylpyridine)41–poly(ethylene oxide)204 (P2VP-PEO) as it self-assembles enabled identification of three microdomains, distinguishable on the basis of micropolarity. These microdomains can be assigned to different supramolecular substructures: the micelle corona (high polarity), the micelle core and the P2VP globule (both low polarity), and the core–corona interface and the globule–PEO junction (both intermediate polarity). Changes in the relative population distributions of these sub-structures as a function of P2VP-PEO pinpoint the onset of micellization corresponding to the critical micelle concentration (CMC) of the copolymer, but indicate significant variation in supramolecular structure, including micelle formation, well below the CMC. This suggests that supramolecular self-assembly in polymeric systems has characteristics of a second order phase transition.

Time-Resolved Synchrotron SAXS Observations on Sheared Syndiotactic Poly(propylene) Crystallization Process

2008 ◽  
Vol 209 (16) ◽  
pp. 1721-1729 ◽  
Author(s):  
Huiying Wen ◽  
Shichun Jiang ◽  
Yongfeng Men ◽  
Lijia An ◽  
Zhonghua Wu ◽  
...  
Keyword(s):  
Crystallization Process ◽  
Time Resolved ◽  
Poly Propylene ◽  
Synchrotron Saxs

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

Isothermal Crystallization Behavior of Isotactic Polypropylene H/D Blends as Viewed from Time-Resolved FTIR and Synchrotron SAXS/WAXD Measurements

2009 ◽  
Vol 42 (12) ◽  
pp. 4191-4199 ◽  
Author(s):  
Kummetha Raghunatha Reddy ◽  
Kohji Tashiro ◽  
Takashi Sakurai ◽  
Noboru Yamaguchi ◽  
Sono Sasaki ◽  
...  
Keyword(s):  
Isotactic Polypropylene ◽  
Isothermal Crystallization ◽  
Crystallization Behavior ◽  
Time Resolved ◽  
Synchrotron Saxs

scholarly journals Calcium Triggered Lα-H2 Phase Transition Monitored by Combined Rapid Mixing and Time-Resolved Synchrotron SAXS

PLoS ONE ◽  
2008 ◽  
Vol 3 (4) ◽  
pp. e2072 ◽  
Author(s):  
Anan Yaghmur ◽  
Peter Laggner ◽  
Barbara Sartori ◽  
Michael Rappolt
Keyword(s):  
Phase Transition ◽  
Time Resolved ◽  
Rapid Mixing ◽  
Synchrotron Saxs
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