AI Article Synopsis
- Novel thermoresponsive sensor systems were created using molecular rotors and paraffin wax for temperature and biometric identification.
- The combination of polydiphenylacetylenes and hydrocarbons allowed for effective phase transitions without compromising the wax's properties.
- These hybrids displayed reversible fluorescence changes at critical temperatures and can be utilized in various advanced applications like image writing/erasing and fingerprint identification.
Article Abstract
Novel thermoresponsive sensor systems consisting of a molecular rotor (MR) and paraffin wax (PW) were developed for various thermometric and biometric identification applications. Polydiphenylacetylenes (PDPAs) coupled with long alkyl chains were used as MRs, and PWs of hydrocarbons having 16-20 carbons were utilized as phase-change materials. The PDPAs were successfully dissolved in the molten PWs and did not act as an impurity that prevents phase transition of the PWs. These PDPA-in-PW hybrids had almost the same enthalpies and phase-transition temperatures as the corresponding pure PWs. The hybrids exhibited highly reversible fluorescence (FL) changes at the critical temperatures during phase transition of the PWs. These hybrids were impregnated into common filter paper in the molten state by absorption or were encapsulated into urea resin to enhance their mechanical integrity and cyclic stability during repeated use. The wax papers could be utilized in highly advanced applications including FL image writing/erasing, an array-type thermo-indicator, and fingerprint/palmprint identification. The present findings should facilitate the development of novel fluorescent sensor systems for biometric identification and are potentially applicable for biological and biomedical thermometry.
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| http://dx.doi.org/10.1021/acsami.5b03842 | DOI Listing |
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