Simultaneous quantitative determination of celecoxib and its two metabolites using liquid chromatography?tandem mass spectrometry in alternating polarity switching mode
- Simultaneous quantitative determination of celecoxib and its two metabolites using liquid chromatography?tandem mass spectrometry in alternating polarity switching mode
- 오현아; 김동학; 이수현; 정병화
- Celecoxib; Alternating polarity switching; Liquid chromatography?tandem massspectrometry; Quantitation; Celecoxib metabolites
- Issue Date
- Journal of pharmaceutical and biomedical analysis
- VOL 107, 32-39
- We report on a systematic study of the electromechanical properties of flexible copper (Cu) thin film for flexible electronics. Cu ink is synthesized with chemical reduction process. Cu ink film spin-coated on a polyimide substrate is annealed with white flash light, also known as intense pulsed light (IPL), which guarantees a room temperature and sub-second process in ambient conditions. IPL annealed Cu film shows the electrical resistivity of 4.8 lX cm and thickness of 200 nm. The electromechanical properties of IPL annealed Cu film are investigated via outer/inner bending, stretching, and adhesion tests, and it is compared with conventional electron-beam evaporated Cu film. IPL annealed Cu film shows a constant electrical resistance within a bending radius of 6 mm. The bending fatigue test shows that the Cu film can withstand 10,000 bending cycles. In the stretching test, the Cu film shows a 50% increase in resistance
when a strain of 2.4% was induced. At 4% strain, the resistance increases more than 200%. Meanwhile, the electron-beam evaporated film shows a constant resistance up to a strain of 4%. Lower stretchability of IPL annealed Cu film is attributed to its inherent cracks and porous film morphologies. IPL annealing induces the local melting at the interface between the substrate and Cu film, which increases the adhesion strength of the Cu film. These results provide useful information regarding the mechanical flexibility and durability of the nanoparticle films for the development of flexible electronics.
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