Hydration-Dependent Hierarchical Structures in Block Copolymer–Surfactant Complex Salts

2018 ◽  
Vol 51 (23) ◽  
pp. 9915-9924 ◽  
Author(s):  
Guilherme A. Ferreira ◽  
Lennart Piculell ◽  
Watson Loh
Keyword(s):  
Block Copolymer ◽  
Hierarchical Structures ◽  
Surfactant Complex ◽  
Complex Salts

scholarly journals Molecular Assembly in Block Copolymer-Surfactant Nanoparticle Dispersions: Information on Molecular Exchange and Apparent Solubility from High-Resolution and PFG NMR

Polymers ◽  
2021 ◽  
Vol 13 (19) ◽  
pp. 3265
Author(s):  
Guilherme A. Ferreira ◽  
Watson Loh ◽  
Daniel Topgaard ◽  
Olle Söderman ◽  
Lennart Piculell
Keyword(s):  
Block Copolymer ◽  
Aqueous Media ◽  
Particle Surface ◽  
Molecular Assembly ◽  
The Self ◽  
Self Diffusion ◽  
Nanoparticle Dispersions ◽  
Complex Salts ◽  
D Values ◽  
Pfg Nmr

Internally structured block copolymer-surfactant particles are formed when the complex salts of ionic-neutral block copolymers neutralized by surfactant counterions are dispersed in aqueous media. Here, we report the 1H NMR signal intensities and self-diffusion coefficients (D, from pulsed field gradient nuclear magnetic resonance, PFG NMR) of trimethyl alkylammonium surfactant ions and the poly(acrylamide)-block-poly(acrylate) (PAAm-b-PA) polyions forming such particles. The results reveal the presence of an “NMR-invisible” (slowly exchanging) fraction of aggregated surfactant ions in the particle core and an “NMR-visible” fraction consisting of surface surfactant ions in rapid exchange with the surfactant ions dissociated into the aqueous domain. They also confirm that the neutral PAAm blocks are exposed to water at the particle surface, while the PA blocks are buried in the particle core. The self-diffusion of the polyions closely agree with the self-diffusion of a hydrophobic probe molecule solubilized in the particles, showing that essentially all copolymer chains are incorporated in the aggregates. Through centrifugation, we prepared macroscopically phase-separated systems with a phase concentrated in particles separated from a clear dilute phase. D values for the surfactant and block copolymer indicated that the dilute phase contained small aggregates (ca. 5 nm) of surfactant ions and a few anionic-neutral block copolymer chains. Regardless of the overall concentration of the sample, the fraction of block copolymer found in the dilute phase was nearly constant. This indicates that the dilute fraction represented a tail of small particles created by the dispersion process rather than a true thermodynamic solubility of the complex salts.

scholarly journals Correction: Block copolymer hierarchical structures from the interplay of multiple assembly pathways

2020 ◽  
Vol 11 (15) ◽  
pp. 2762-2762
Author(s):  
Alessandro Ianiro ◽  
Meng Chi ◽  
Marco M. R. M. Hendrix ◽  
Ali Vala Koç ◽  
E. Deniz Eren ◽  
...  
Keyword(s):  
Block Copolymer ◽  
Hierarchical Structures ◽  
Assembly Pathways ◽  
Multiple Assembly

Correction for ‘Block copolymer hierarchical structures from the interplay of multiple assembly pathways’ by Alessandro Ianiro et al., Polym. Chem., 2020, DOI: 10.1039/d0py00081g.

Film instability induced evolution of hierarchical structures in annealed ultrathin films of an asymmetric block copolymer on polar substrates

Polymer ◽  
2011 ◽  
Vol 52 (4) ◽  
pp. 1180-1190 ◽  
Author(s):  
Ya-Sen Sun ◽  
Shih-Wei Chien ◽  
Jiun-You Liou ◽  
Chiu Hun Su ◽  
Kuei-Fen Liao
Keyword(s):  
Block Copolymer ◽  
Ultrathin Films ◽  
Hierarchical Structures ◽  
Film Instability

The height of cell-adhesive nanoposts generated by block copolymer/surfactant complex systems influences the preosteoblast phenotype

2014 ◽  
Vol 123 ◽  
pp. 679-684
Author(s):  
Eun Ju Jeong ◽  
Jin Wook Lee ◽  
Young-Je Kwark ◽  
Seung Hyun Kim ◽  
Kuen Yong Lee
Keyword(s):  
Block Copolymer ◽  
Complex Systems ◽  
Surfactant Complex ◽  
Cell Adhesive

Carboxyl-functionalized nanochannels based on block copolymer hierarchical structures

2018 ◽  
Vol 209 ◽  
pp. 303-314 ◽  
Author(s):  
Valentina-Elena Musteata ◽  
Stefan Chisca ◽  
Florian Meneau ◽  
Detlef-M. Smilgies ◽  
Suzana P. Nunes
Keyword(s):  
Phase Separation ◽  
Block Copolymer ◽  
Block Copolymers ◽  
Growth Mechanism ◽  
Butyl Acrylate ◽  
Hierarchical Structures ◽  
Nucleation And Growth ◽  
Porous Structures ◽  
Hexagonally Ordered ◽  
Nucleation And Growth Mechanism

Hierarchical isotropic porous structures with spherical micrometer-sized cavities, interconnected by hexagonally ordered nanochannels, were prepared based on the phase separation of polystyrene-b-poly(t-butyl acrylate) block copolymers, following a nucleation and growth mechanism.

How Does the Ethoxylated Grafting of Polyelectrolytes Affect the Self-Assembly of Polyanion–Cationic Surfactant Complex Salts?

Langmuir ◽  
2014 ◽  
Vol 30 (39) ◽  
pp. 11493-11503 ◽  
Author(s):  
Ana Maria Percebom ◽  
Leandro Ramos Souza Barbosa ◽  
Rosangela Itri ◽  
Watson Loh
Keyword(s):  
Cationic Surfactant ◽  
Self Assembly ◽  
The Self ◽  
Surfactant Complex ◽  
Complex Salts

scholarly journals Block copolymer hierarchical structures from the interplay of multiple assembly pathways

2020 ◽  
Vol 11 (13) ◽  
pp. 2305-2311
Author(s):  
Alessandro Ianiro ◽  
Meng Chi ◽  
Marco M. R. M. Hendrix ◽  
Ali Vala Koç ◽  
E. Deniz Eren ◽  
...  
Keyword(s):  
Phase Separation ◽  
Block Copolymer ◽  
Hierarchical Structures ◽  
Assembly Pathways ◽  
Multiple Assembly

Structurally complex hierarchical block copolymer assemblies can be formed in solution by controlling the interplay of phase separation, crystallization and block segregation with temperature.

Hierarchically ordered nanostructures of a supramolecular rod-coil block copolymer with a hydrogen-bonded discotic mesogen

2019 ◽  
Vol 10 (8) ◽  
pp. 991-999 ◽  
Author(s):  
Hongbing Pan ◽  
Wei Zhang ◽  
Anqi Xiao ◽  
Xiaolin Lyu ◽  
Pingping Hou ◽  
...  
Keyword(s):  
Hydrogen Bonding ◽  
Block Copolymer ◽  
Block Copolymers ◽  
Liquid Crystalline ◽  
Hierarchical Structures ◽  
Molar Ratio ◽  
Ordered Nanostructures ◽  
Hydrogen Bonded

Supramolecular liquid crystalline block copolymers prepared via hydrogen bonding exhibit hierarchical structures that can be tuned by varying the molar ratio of the discotic hydrogen-bonding acceptor to the block copolymer donor.

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