Chiral
plasmonic nanocrystals are promising materials for applications
in enantioselective catalysis, DNA detection, and medical diagnosis.
Herein, we demonstrate a simple and versatile strategy that produces
plasmonic nanostructures with strong chiroptical responses by a chiral
ligand mediated seeded growth approach. By modulation of the surface
coverage of chiral ligands on Au nanotriangles, propeller-like structures
with the growth of three arms on the tips of the triangles are produced
with a high anisotropy factor. Finally, these Au chiral propellers
can be used as substrates for the surface-enhanced Raman scattering
(SERS) detection of chiral biomolecules, achieving chiral differentiation
for enantiomers of biomolecules.
The objective of this paper was to develop a nonlinear chemical fingerprint technique for identifying and detecting adulteration of goat milk with cow milk. In this study, by taking the Belousov-Zhabotinsky oscillatory chemical reaction using acetone and substrates in goat milk or cow milk as main dissipative substances, when the same dosage of goat milk and cow milk was introduced to the "H + Mn + BrO + acetone" oscillating system respectively, nonlinear chemical fingerprints were obtained for goat milk and cow milk from the same origin. The results showed that inductive time value and the content of cow milk in goat milk had a linear relationship in the range of 0-100% and the corresponding regression coefficient was 0.9991. A detection limit of 0.0107 g/g was obtained, and the content of cow milk in mixed milk was calculated. The proposed method in this study was simple, economical and effective. In addition, the method did not need the pretreatment and separation of samples for identifying and evaluating cow milk adulteration in goat milk.
The
development of novel solid-state fluorescence switches, particularly
triggered by visible light, is of increasing interest for the potential
application in optical data storage and super-resolution fluorescence
microscopies. In this study, two carbazole–dithienylethene–BF2bdk triads CDB1 and CDB2, suspending
carbazole and BF2bdk moieties on both sides of dithienylethene
unit, have been developed. They exhibit blue-/NIR light-controlled
photochromism with solvent-dependent characteristics. Moreover, CDB1 (o) reveals blue-/NIR light-induced reversible fluorescent
switching behaviors in toluene, chloroform, poly(methyl methacrylate)
(PMMA) film, and powder state, while its analogue CDB2 (o) in the powder state exhibits no fluorescence due to a strong intermolecular
π–π stacking interaction, and the fluorescent switching
performance is observed only in toluene and PMMA film. The density
functional theory calculations further validate the differences in
their optical properties in the solution and powder states.
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