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Related Experiment Video

Updated: Jun 21, 2026

Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering
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Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering

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pH-responsive reversibly swellable nanotube arrays.

Khek-Khiang Chia1, Michael F Rubner, Robert E Cohen

  • 1Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.

Langmuir : the ACS Journal of Surfaces and Colloids
|July 11, 2009
PubMed
Summary

Researchers created surface-bound nanotube arrays using porous templates. These submicrometer tubes, made from a pH-sensitive polymer, can reversibly swell and shrink, offering tunable dimensions for advanced applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Polymer Chemistry

Background:

  • Substrate-bound nanotube arrays offer potential for various applications.
  • Controlling nanotube dimensions and arrangement is crucial for functionality.
  • Reversible swelling polymers present opportunities for dynamic material systems.

Purpose of the Study:

  • To develop a method for synthesizing substrate-bound nanotube arrays with controlled dimensions.
  • To investigate the pH-triggered reversible swelling behavior of these nanotube arrays.
  • To explore the influence of template pore structure on nanotube morphology.

Main Methods:

  • Utilizing a sacrificial template approach for nanotube synthesis.
  • Employing a specific polyelectrolyte multilayer (PEM) system (poly(allylamine hydrochloride)/poly(acrylic acid)) as the building block.

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Fabricating Degradable Thermoresponsive Hydrogels on Multiple Length Scales via Reactive Extrusion, Microfluidics, Self-assembly, and Electrospinning
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Last Updated: Jun 21, 2026

Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering
09:12

Functionalization of Single-walled Carbon Nanotubes with Thermo-reversible Block Copolymers and Characterization by Small-angle Neutron Scattering

Published on: June 1, 2016

Engineering Molecular Recognition with Bio-mimetic Polymers on Single Walled Carbon Nanotubes
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Engineering Molecular Recognition with Bio-mimetic Polymers on Single Walled Carbon Nanotubes

Published on: January 10, 2017

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  • In situ characterization using confocal laser scanning microscopy (CLSM) to observe dynamic changes.

    • Main Results:

    • Successfully synthesized substrate-bound arrays of submicrometer-sized tubes.
    • Demonstrated straightforward control over tube length, diameter, and lateral arrangement.
    • Observed dramatic, reversible pH-triggered swelling-deswelling transitions in the nanotubes.
    • Correlated structural changes to the breaking and reforming of ionic cross-links in the PEM system.

    Conclusions:

    • The sacrificial template method provides precise control over nanotube array fabrication.
    • The chosen PEM system exhibits significant, reversible dimensional changes in response to pH.
    • These findings enable the development of responsive nanomaterials with tunable properties.