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Intelligent core-shell nanoparticles and hollow spheres based on gelatin and PAA via template polymerization

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Abstract.
PAA/gelatin nanoparticles, with interpolymer complexes of gelatin and polyacrylic acid (PAA) as the cores
and gelatin as the shells, were prepared via facile polymerization of AA on gelatin template. The morphology
change of the nanoparticles during the reaction was traced by a combined use of dynamic light scattering
(DLS) and atomic force microscopy (AFM) techniques, which revealed a discrepancy among the
structure of the nanoparticles formed at different stages of the reaction: as the reaction proceeds, nanoparticles with larger compact cores and thinner shells are produced. The resultant nanoparticles are
multi-responsive. Especially, they exhibit a significant temperature-dependent size change: upon raising
the temperature from 25 oC, the nanoparticle size decreases monotonically until reaching equilibrium at
about 40 oC. This temperature-dependence of the nanoparticle size was found to be reversible provided
the nanoparticle solution was cooled at a low temperature (4 oC). The thermo-sensitivity of the nanoparticles
is attributed to the thermo-induced sol–gel transition of the gelatin shells. In addition, the nanoparticles
were further converted to hollow spheres via successive locking the shell structure by the reaction
of gelatin with cross-linker glutaraldehyde, and cavitation of the cross-linked nanoparticles by switching
the medium from acidic to neutral. The cavitation process was monitored by DLS, which indicated a mass
decrease and size shrinkage. AFM and transmission electron microscopy (TEM) were used to trace the
morphology change of the nanoparticles during the cavitation. The hollow structure was confirmed by
TEM observation.

Keywords:
Polymerization
Intelligent nanoparticles
Cavitation
Hollow spheres

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Informasi Detail

Judul Seri

Journal of Colloid and Interface Science

No. Panggil

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Penerbit

London : Elsevier Inc.., 2009

Deskripsi Fisik

Journal of Colloid and Interface Science 334 (2009) 153–160

Bahasa

English

ISBN/ISSN

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Klasifikasi

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Tipe Isi

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Tipe Media

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Tipe Pembawa

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Edisi

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Subjek

KIMIA

Info Detail Spesifik

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Pernyataan Tanggungjawab

agus

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