RESUMO
The use of one-dimensional nano- and microstructured semiconductor and lanthanide materials is attractive for polarized-light-emission studies. Up-conversion emission from single-nanorod or anisotropic nanoparticles with a degree of polarization has also been discussed. However, microscale arrays of nanoparticles, especially well-aligned one-dimensional nanostructures as well as their up-conversion polarization characterization, have not been investigated yet. Herein, we present a novel and facile paradigm for preparing highly aligned arrays of lanthanide-doped KMnF3 (KMnF3:Ln) perovskite nanowires, which are good candidates for polarized up-conversion emission studies. These perovskite nanowires, with a width of 10 nm and length of a few micrometers, are formed through the oriented attachment of KMnF3:Ln nanocubes along the [001] direction. By the employment of KMnF3:Ln nanowire gel as nanoink, a direct-writing method is developed to obtain diverse types of aligned patterns from the nanoscale to the wafer scale. Up-conversion emissions from the highly aligned nanowire arrays are polarized along the array direction with a polarization degree up to 60%. Taking advantage of microscopic nanowire arrays, these polarized up-conversion emissions should offer potential applications in light or information transportation.
RESUMO
We investigate the fluorescence from submonolayer porphyrin molecules near silver-polymer core-shell nanoparticles (NPs) at a well-controlled separation distance of about 1 nm - 5 nm. When porphyrin molecules are deposited on silver NPs with the plasmonic resonance peak at about 410 nm, which matches very closely with the 405-nm excitation laser and the absorption band of porphyrin molecules, their emission intensity is found to be enhanced due to the plasmonic resonant excitation enhancement, and shows a decline as the increasing polymer shell thickness. Meanwhile, the lifetime results demonstrate that there exists the fluorescence quenching due to the charge transfer and nonradiative energy transfer losses, which is also the main reason that the maximum enhancement factor obtained in experiment is only about 2.3, although the theoretical one is above 60 according to the electric field distribution near silver NPs calculated by finite-difference time-domain method.
RESUMO
OBJECTIVE: To compare the efficacy differences of electroacupuncture (EA) with intermittent wave, disperse-dense wave and continuous wave combined with rehabilitation therapy for post-stroke shoulder subluxation in order to provide clinical evidence for selection of electroacupuncture wave. METHODS: Seventy-five cases of shoulder subluxation were randomly divided into an intermittent wave (IW) group, a disperse-dense wave (DW) group and a continuous wave (CW) group, 25 cases in each one. Based on regular treatment including blood pressure and sugar control, EA and rehabilitation therapy were given in three groups. With EA at Jianqian (Extra), Taijian(Extra), Binao (LI 14), Jianzhong (Extra), Jianzhen (SI 9), Naoshu (SI 10), Jianwaishu (SI 14) and Bingfeng (SI 12), IW group was treated with intermittent wave with a frequency of 15 Hz, DW group was treated with disperse-dense wave with a frequency of 2 Hz/15 Hz and CW group was treated with continuous wave with a frequency of 15 Hz. The EA treatment was given for 20 min, once a day, six times a week and totally for 4 weeks. The Fugl-Meyer score and Barthel index score were used for assessment of function recovery before and after treatment respectively, also the efficacy of three groups was compared. RESULTS: The total effective rate was 96.0% (24/25) in the IW group, which was superior to 68.0% (17/ 25) in the DW group and 64.0% (16/25) in the CW group (both P < 0.05). After the treatment, Fugl-Meyer score and Barthel index score in the three groups were obviously improved (all P < 0.05), which was most significant in the IW group (all P < 0.01). CONCLUSION: Electroacupuncture with intermittent wave combined with rehabilitation therapy has superior effect to disperse-dense wave and continuous wave on the treatment of post-stroke shoulder subluxation, which could effectively improve shoulder subluxation and promote shoulder function recovery.