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Supramolecular assembly of thermoresponsive steroidal surfactant with oppositely charged thermoresponsive block copolymer

Schillén, Karin LU ; di Gregorio, Maria Chiara; Gubitosi, Marta; Travaglini, Leana; Pavel, Nicolae Viorel; Jover, Aida; Meijide, Francisco; Tato, José Vázquez; Sennato, Simona and Tranchini, Francesco, et al. (2017) In Physical Chemistry Chemical Physics 19(2). p.1504-1515
Abstract
Supramolecular rearrangements are crucial in determining the response of stimuli sensitive soft matter systems such as those formed by mixtures of oppositely charged amphiphiles. Here mixtures of this kind were prepared by mixing the cationic block copolymer pAMPTMA30-b-pNIPAAM120 and an anionic surfactant obtained by the modification of the bile salt sodium cholate. As pure components, the two compounds presented a thermoresponsive self-assembly at around 30–35 °C; a micelle formation in the case of the copolymer and a transition from fibers to tubes in the case of the bile salt derivative. When both were present in the same solution they associated into mixed aggregates that showed complex thermoresponsive features. At room temperature,... (More)
Supramolecular rearrangements are crucial in determining the response of stimuli sensitive soft matter systems such as those formed by mixtures of oppositely charged amphiphiles. Here mixtures of this kind were prepared by mixing the cationic block copolymer pAMPTMA30-b-pNIPAAM120 and an anionic surfactant obtained by the modification of the bile salt sodium cholate. As pure components, the two compounds presented a thermoresponsive self-assembly at around 30–35 °C; a micelle formation in the case of the copolymer and a transition from fibers to tubes in the case of the bile salt derivative. When both were present in the same solution they associated into mixed aggregates that showed complex thermoresponsive features. At room temperature, the core of the aggregate was comprised of a supramolecular twisted ribbon of the bile salt derivative. The block copolymers were anchored on the surface of this ribbon through electrostatic interactions between their charged blocks and the oppositely charged heads of the bile salt molecules. The whole structure was stabilized by a corona of the uncharged blocks that protruded into the surrounding solvent. By increasing the temperature to 30–34 °C the mixed aggregates transformed into rods with smooth edges that associated into bundles and clusters, which in turn induced clouding of the solution. Circular dichroism allowed us to follow progressive rearrangements of the supramolecular organization within the complex, occurring in the range of temperature of 20–70 °C. (Less)
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Contribution to journal
publication status
published
subject
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Physical Chemistry Chemical Physics
volume
19
issue
2
pages
1504 - 1515
publisher
Royal Society of Chemistry
external identifiers
  • scopus:85027253746
  • wos:000392399400062
ISSN
1463-9084
DOI
10.1039/C6CP05665B
language
English
LU publication?
yes
id
db9902ee-7dde-4724-8ed3-2e8055faf1c6
date added to LUP
2017-01-09 14:05:11
date last changed
2018-01-07 11:43:58
@article{db9902ee-7dde-4724-8ed3-2e8055faf1c6,
  abstract     = {Supramolecular rearrangements are crucial in determining the response of stimuli sensitive soft matter systems such as those formed by mixtures of oppositely charged amphiphiles. Here mixtures of this kind were prepared by mixing the cationic block copolymer pAMPTMA30-b-pNIPAAM120 and an anionic surfactant obtained by the modification of the bile salt sodium cholate. As pure components, the two compounds presented a thermoresponsive self-assembly at around 30–35 °C; a micelle formation in the case of the copolymer and a transition from fibers to tubes in the case of the bile salt derivative. When both were present in the same solution they associated into mixed aggregates that showed complex thermoresponsive features. At room temperature, the core of the aggregate was comprised of a supramolecular twisted ribbon of the bile salt derivative. The block copolymers were anchored on the surface of this ribbon through electrostatic interactions between their charged blocks and the oppositely charged heads of the bile salt molecules. The whole structure was stabilized by a corona of the uncharged blocks that protruded into the surrounding solvent. By increasing the temperature to 30–34 °C the mixed aggregates transformed into rods with smooth edges that associated into bundles and clusters, which in turn induced clouding of the solution. Circular dichroism allowed us to follow progressive rearrangements of the supramolecular organization within the complex, occurring in the range of temperature of 20–70 °C.},
  author       = {Schillén, Karin and di Gregorio, Maria Chiara and Gubitosi, Marta and Travaglini, Leana and Pavel, Nicolae Viorel and Jover, Aida and Meijide, Francisco and Tato, José Vázquez and Sennato, Simona and  Tranchini, Francesco and  De Santis, Serena and  Masci, Giancarlo and Galantini, Luciano},
  issn         = {1463-9084},
  language     = {eng},
  number       = {2},
  pages        = {1504--1515},
  publisher    = {Royal Society of Chemistry},
  series       = {Physical Chemistry Chemical Physics},
  title        = {Supramolecular assembly of thermoresponsive steroidal surfactant with oppositely charged thermoresponsive block copolymer},
  url          = {http://dx.doi.org/10.1039/C6CP05665B},
  volume       = {19},
  year         = {2017},
}