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

Karin Schillén, Maria Chiara di Gregorio, Marta Gubitosi, Leana Travaglini, Nicolae Viorel Pavel, Aida Jover, Francisco Meijide, José Vázquez Tato, Simona Sennato, Francesco Tranchini, Serena De Santis, Giancarlo Masci, Luciano Galantini

Research output: Contribution to journalArticlepeer-review

17 Citations (SciVal)

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.
Original languageEnglish
Pages (from-to)1504-1515
JournalPhysical Chemistry Chemical Physics
Volume19
Issue number2
Early online date2016
DOIs
Publication statusPublished - 2017

Subject classification (UKÄ)

  • Physical Chemistry
  • Theoretical Chemistry
  • Inorganic Chemistry

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