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Updated: May 1, 2026

Magnetic and Thermal-sensitive PolyN-isopropylacrylamide-based Microgels for Magnetically Triggered Controlled Release

Magnetic and Thermal-sensitive PolyN-isopropylacrylamide-based Microgels for Magnetically Triggered Controlled Release

Published on: July 4, 2017

Programmable polymer-based supramolecular temperature sensor with a memory function.

Léna Sambe¹, Victor R de La Rosa, Khaled Belal

¹Université Lille Nord de France, ENSCL, Unité des Matériaux et Transformations, UMR CNRS 8207, Equipe Ingénierie des Systèmes Polymères (ISP), 59655 Villeneuve d'Ascq Cedex (France).

Angewandte Chemie (International Ed. in English)

|April 9, 2014

Summary

This summary is machine-generated.

Researchers developed a novel polymeric thermometer using supramolecular interactions. This thermometer remembers its thermal history due to a unique phase transition hysteresis, offering potential applications in science.

Keywords:

host-guest systems memory phase transitions supramolecular chemistry thermometer

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Area of Science:

Supramolecular Chemistry
Polymer Science
Materials Science

Background:

Thermoresponsive polymers like poly(N-isopropylacrylamide) (PNIPAM) exhibit a lower critical solution temperature (LCST) phase transition.
Supramolecular host-guest chemistry involves interactions between molecular hosts and guests, influencing material properties.

Purpose of the Study:

To develop a new class of polymeric thermometers with a memory function.
To investigate the role of supramolecular host-guest interactions in creating thermal memory.

Main Methods:

Utilizing poly(N-isopropylacrylamide) (PNIPAM) with naphthalene guest moieties.
Employing cyclobis(paraquat-p-phenylene) (CBPQT(4+)) as a tetracationic macrocycle host.
Analyzing the thermoresponsive LCST phase transition and its hysteresis.

Main Results:

A polymeric thermometer based on PNIPAM-CBPQT(4+) host-guest complexes was successfully developed.
The thermometer demonstrated a memory function attributed to the large hysteresis of the LCST phase transition.
A metastable soluble state, formed by the host-guest complex, was identified as the cause of hysteresis.

Conclusions:

The developed supramolecular thermometer exhibits a memory function for thermal history.
The findings provide insights into the kinetic control of supramolecular assemblies.
This technology holds potential for applications in physical and biological sciences.