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Preparation and characterization of functional inorganic/organic composite microspheres via electrostatic interaction

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Abstract.
In this paper, a simple approach was presented to prepare functional inorganic/organic composite
microspheres in which the inorganic nanoparticles were encapsulated into the polyelectrolyte complexes
between chitosan (CS) and poly(aspartic acid) sodium salt (PAsp). The magnetic microspheres were
prepared via electrostatic interaction between the citrate groups stabilizing Fe3O4 nanoparticles and the
amino groups of CS. Being taken as a kind of special polyelectrolyte with high molecular weight, the
inorganic nanoparticles presented strong interaction with polyelectrolyte. By tuning the unit molar ratio
of the opposite charged polyelectrolytes and the amount of Fe3O4 nanoparticles, the structure of the
composite microspheres could be controlled and the dimension of microspheres ranged from 110 nm to
320 nm. Then the approach was extended to prepare luminescent-magnetic CS–PAsp microspheres by
encapsulated Fe3O4 nanoparticles and CdTe quantum dots synchronously, which exhibited superior pH
stability and remained strong photoluminescence properties after crosslinking. The CdTe–Fe3O4/CS–PAsp
composite microspheres are potentially useful for further application in biolabeling and imaging.

Keywords:
Chitosan
Magnetic nanoparticles
Quantum dots
Composite microspheres
Electrostatic interaction

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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 333 (2009) 749–756

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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