期刊
INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION
卷 14, 期 4, 页码 351-363出版社
TAYLOR & FRANCIS LTD
DOI: 10.1080/10236660902875208
关键词
Colloidal crystal array; Core-shell microgels; Polystyrene; Reflectance
资金
- National Institutes of Health [P20 MD001085]
- Department of Defense [W911NF-06-1-0433]
We report the investigation of a colloidal crystal array (CCA) of thermoresponsive colloidal core-shell microgels prepared via the emulsion polymerization method using polystyrene (PS) as a hard core and N,N,-methylene(bisacrylamide) (BIS) as a cross-linker with acrylic acid (AA) as a co-monomer with a soft-shell morphology. In this work, PS/NIPAm colloidal core-shell microgels were prepared and characterized by Atomic Force Microscopy (AFM), particle size analyzer, and reflectance measurements. In situ measurement of reflectance with varying temperatures was carried out from 25 to 45C using a special setup assembly with a temperature controller attached to the sample stand of the reflectance measurement instrument. PS core and PNIPAm shell morphology was confirmed by AFM analysis. The effect of varying mole of N-isopropylacrylamide (NIPAm) from 2.1 to 8.3mmol while keeping the shell monomer ratio constant on the reflectance and particle size measurements with respect to temperature was investigated. The particle size increased as the NIPAm molar proportion was increased from 2.1 to 8.3mmol. As expected, using more NIPAm led to an increase in the particle size and a thicker shell. A general trend was observed in the variation of reflectance wavelength peak decreasing with increase in temperature, allowing these novel CCA of PS/NIPAm microgels to be a potential core-shell microgel candidate for chemical sensor applications and optically tunable materials.
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