pH-Responsive Reversibly Swellable Nanotube Arrays

Autor:	Khek-Khiang Chia, Michael F. Rubner, Robert E. Cohen
Rok vydání:	2009
Předmět:	Nanotube Materials science Ionic bonding Nanotechnology Surfaces and Interfaces Substrate (electronics) Condensed Matter Physics Allylamine chemistry.chemical_compound Planar Template chemistry Chemical engineering Electrochemistry General Materials Science Porosity Spectroscopy Acrylic acid
Zdroj:	Langmuir. 25:14044-14052
ISSN:	1520-5827 0743-7463
DOI:	10.1021/la9015959
Popis:	We demonstrate a technique for synthesizing substrate-bound arrays of submicrometer-sized reversibly swellable tubes by using porous templates. The sacrificial template approach allows straightforward control over the tube length, diameter, and lateral arrangement of the resultant surface-bound nanotubes. We also explored methods for varying the tube opening structure by altering the pore shape at the surface of the template. A specific PEM system composed of poly(allylamine hydrochloride) and poly(acrylic acid) was chosen as the building block for the nanotube arrays because of its ability to undergo pH-triggered swelling-deswelling transitions. The activation of this transition results in dramatic changes in the length and diameter of the nanotubes as characterized in situ via confocal laser scanning microscopy (CLSM). The pH-driven reversible swelling-deswelling and nanoporosity behavior observed with planar films and nanotubes of this PEM system is a direct consequence of the breaking and reforming of ionic cross-links.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::37a080c4c7427ff328a04bc73c2031c4 https://doi.org/10.1021/la9015959 Zobrazit plný text záznamu