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http://dx.doi.org/10.7464/ksct.2014.20.3.226

Synthesis of Shape Reconfigurable Janus Particles by External pH Stimuli  

Eom, Naye (Department of Energy Science and Technology, Graduate School of Energy Science and Technology, Chungnam National University)
Kim, Jongmin (Department of Chemical Engineering, Chungnam National University)
Kang, Sung-Min (Department of Chemical Engineering, Chungnam National University)
Lee, Chang-Soo (Department of Chemical Engineering, Chungnam National University)
Publication Information
Clean Technology / v.20, no.3, 2014 , pp. 226-231 More about this Journal
Abstract
This study presents a micromolding for the synthesis of Janus particles with reconfigurable shape by pH stimuli. First, we use acrylic acid (AA) as pH responsive monomer in the hydrophilic part and trimethylolpropane triacylate (TMPTA) in the hydrophobic part, respectively. The change of acidity in solvent induces the swelling of hydrophilic part in the Janus particles. The pH-responsive Janus particles show different swelling ratio of hydrophilic part in according to composition of acrylic acid in diverse range (0-70% v/v) and pH (3-11). As the concentration of acrylic acid in the hydrophilic part and environmental pH increase, the hydrophilic part in the Janus particles is proportionally swelled. Second, we fabricate novel type of Janus particles with two different hydrophilicities. As a proof of concept, we have applied acrylic acid (AA) and 2-(dimethylamino)ethyl methacrylate (DAEMA) into each part because the monomers provide reverse responsive activity. As expected, these Janus particles show different shape anisotropies with reconfigurable property in accordance with the polarity of each part at same acidity of environmental solvent. We envision that the stimuli responsive Janus particles have a wide application from fundamental science to diagnostic apparatus.
Keywords
Micromolding; Bipolar janus particle; pH-responsiveness; Shape reconfigurability;
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Times Cited By KSCI : 2  (Citation Analysis)
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