Somkieath Jenjob 1 , Chonthicha Nuangnuch 1 , Panya Sunintaboon 1* , Vichai Reutrakul 1
1 Department of Chemistry and Center of Excellence for Innovation in Chemistry,
Faculty of science, Mahidol University
* E-mail: scpsu@mahidol.ac.th, Tel: 0-2441-9816 (ext.1138)
The negatively charged poly(methyl methacrylate) (PMMA) nanoparticles prepared by a soap-free emulsion polymerization were deposited by the positively charged chitosan (CH) via an electrostatic interaction on a spinning disk reactor (SDR). SDR provides rapid and efficient mixing between the oppositely charged components. The colloidal stability was attributed to the presence of a hydrated CH layer around the particles. The heterodeposited nanoparticle characterization was performed by means of dynamic light scattering, ζ-potential measurement, atomic force microscopy, and transmission electron microscope. The mean particle size of PMMA nanoparticles was 275 nm and PMMA/CH core-shell nanoparticles were in a range of 301 to 325 nm by varying molecular weight and concentration of CH. The surface charge of PMMA nanoparticles was -75.4
mV and those of PMMA/CH core-shell nanoparticles were in a range of +57.7 to +71.4 mV depending on concentration of CH (Mw of 100 kDa). The morphology of the complex between oppositely charged PMMA nanoparticles and CS was revealed by TEM and AFM. The coating of the positively charged
CH on negatively charged PMMA nanoparticles was also confirmed by FT-IR.
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