Journal
JOURNAL OF MATERIALS CHEMISTRY C
Volume 1, Issue 38, Pages 6151-6156Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c3tc30765d
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Funding
- US National Science Foundation [DMR-0956081]
- Research Corporation for Science Advancement for the Cottrell Scholar Award
- DuPont for the Young Professor Grant
- Direct For Mathematical & Physical Scien [0956081] Funding Source: National Science Foundation
- Division Of Materials Research [0956081] Funding Source: National Science Foundation
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One-dimensional photonic nanochains composed of periodically arranged superparamagnetic nanoparticles have been exploited as basic color units for a new type of photonic ink. The photonic response of ink can be rapidly and repetitively switched on and off by tuning the direction of external magnetic fields. Temporary bi-stability is realized in the photonic ink by introducing highly viscous solvents as a dispersant, which suppress the rotational movement of nanochains and allow them to stay temporarily aligned after the removal of external magnetic field and to retain their photonic response for a considerably long period. Increasing the viscosity of the dispersant enhances the bi-stability of photonic inks; for instance, the ink prepared in 95% glycerol solution is able to retain its color up to ten minutes. The length of the chains also plays an important role in their temporary bi-stability. By mixing chains with different photonic properties and lengths, a display has been developed which exhibits two distinct colors in response to the application and removal of external magnetic fields.
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