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A dynamic distributed Brillouin optical fiber sensor based on dual-modulation is proposed, in which the scanning of the Brillouin gain spectrum (BGS) is implemented by the combination of a single-frequency modulation and a frequency-agility modulation. The frequency of the single-frequency modulation is slightly lower than the Brillouin frequency shift of the fiber (∼10.8 GHz for silica fibers), while...
A novel supramolecular organogel consisting of β-cyclodextrin (β-CD), 4,4′-isopropylidendiphenol (BPA), LiCl, N,N-dimethylformamide (DMF) and ethanol (EtOH) was prepared. The system without EtOH was a clear solution at ambient temperature and turned into an organogel upon the addition of ethanol (EtOH). The micro-morphologies of the organogel were various, such as ellipsoids, spheres, cuboids and...
A new cyclodextrin derivative 6-O-(2-hydroxyl-3-betainylpropyl)-β-cyclodextrin (6-HBP-β-CD) was prepared with a “synthesis-deprotection one pot” method and studied as an efficient chiral selector in the separation of racemic mixtures of drugs by capillary electrophoresis (CE). Compared with β-CD and 2-HP-β-CD, 6-HBP-β-CD could provide efficient separating capability about alkali racemic mixtures of...
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