Hollow Thermoresponsive Microgels

descriptionPublicationkeyboard_double_arrow_right Article 25 Feb 2005 English Publisher:WileyJournal:Small, volume 1, pages 416-421 (issn: 1613-6810, eissn: 1613-6829,

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Authors: Satish, Nayak; Daoji, Gan; Michael J, Serpe; L Andrew, Lyon;

doi: 10.1002/smll.200400089

pmid: 17193466

Hollow Thermoresponsive Microgels

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Abstract

AbstractThermoresponsive poly(N‐isopropyl acrylamide) (pNIPAm) microgels possessing a hollow structure have been synthesized from core–shell nanoparticles upon oxidation of the particle core, followed by removal of the produced polymer segments by centrifugation. N,N′‐(1,2‐dihydroxyethylene)bisacrylamide (DHEA) is used as a cross‐linker for preparing the degradable core, whereas N,N′‐methylenebis(acrylamide) (BIS) is used as a cross‐linker to add a nondegradable pNIPAm shell. Addition of NaIO4 to a suspension of these particles in water leads to controlled degradation of the particle core by cleavage of the 1,2‐glycol bond in DHEA. Fluorescence spectroscopy, UV/Vis spectroscopy, and photon correlation spectroscopy are used to characterize the hollow particles produced.

Related Organizations

Georgia Institute of Technology
United States

Keywords

Acrylamide, Nanotubes, Polymers, Surface Properties, Temperature, Dehydroepiandrosterone, Nanostructures, Spectrometry, Fluorescence, Materials Testing, Nanoparticles, Nanotechnology, Spectrophotometry, Ultraviolet, Particle Size, Crystallization, Gels

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