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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Shin, Jinsub Han, Sung Gu Lee, Wonmok |
| Description | Author Affiliation: Shin J ( Department of Chemistry, Sejong University, Gwangjin-Gu, Seoul, Republic of Korea.) |
| Abstract | pH sensitive inverse opal sensors were synthesized using various vinyl monomers containing acidic or basic substituents. Acrylic acid (AA), vinylphosphonic acid (VPA), vinylimidazole (VI), and dimethylaminoethylmethacrylic acid (DMAEMA) were respectively copolymerized with hydroxyethylmethacrylate (HEMA), the building block monomer of the hydrogel via UV-initiated photopolymerization. Opal templating and subsequent template removal enabled the fabrication of four inverse opal (IO) hydrogel colorimetric sensors, which responded to pH in different fashions. pH-dependent swelling of the IO hydrogel induced the red-shift of the diffracted color. The sensors containing AA or VPA, the proton donating monomers showed the color shifts from green to red with pH increase due to the increased concentration of carboxylate anions bound to the hydrogel. Diprotic VPA sensor exhibited two-step increases of diffracted wavelengths at its pK(a1) and pK(a2) respectively. The sensors containing proton acceptors, VI and DMAEMA showed the pH-dependent color changes in an opposite way to the AA sensor and the VPA sensor since their ionizations take place by lowering pH due to the protonation at the amino groups. The shapes of pH response curves of VI and DMAEMA sensors were similar but pK(b)s were different from each other. Optical diffraction responses of four sensors were compared with the calculated concentration ratios of the ionized species to the total monomer with pH variation, and a deswelling effect in the vicinities of pK(a)s of phosphate buffer on the swelling response could be explained by shrinkage of PHEMA hydrogel under high ionic environment. In addition, copolymerization of AA, VPA and HEMA was carried out which resulted in a pH sensor exhibiting a wider range of pH for color change. |
| File Format | HTM / HTML |
| ISSN | 00032670 |
| Volume Number | 752 |
| e-ISSN | 18734324 |
| Journal | Analytica Chimica Acta |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2012-11-08 |
| Publisher Place | Netherlands |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Discipline Analytical Discipline Chemistry Hydrogels Analysis Polyhydroxyethyl Methacrylate Analogs & Derivatives Electrodes Chemical Synthesis Hydrogen-ion Concentration Molecular Structure Polymerization Journal Article Research Support, Non-u.s. Gov't |
| Content Type | Text |
| Resource Type | Article |
| Subject | Spectroscopy Environmental Chemistry Analytical Chemistry Biochemistry |
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