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白玉浴血木虫 (正式写手)
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[求助]
求对红移比较了解的人帮忙看一下
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On addition of 10 mM EmimOs to a solution of C-343 in SB-16 micelles, the emission maximum of C-343 exhibits a marked red shift from 476 to 488 nm (Figure 1b). This red shift by 12 nm indicates the transfer of the C-343 molecules toward the bulk water. On increasing the concentration of EmimOs to 20 mM, the emission spectra of C-343 was redshifted to 491 nm which remained unchanged on further addition of EmimOs. This bathochromic shift of the emission spectra of the dye with the increase in EmimOs concentration indicates an increase in the micropolarity around the probe molecules. We also obtained similar results on the addition of anionic surfactant (SDS), but the effect was more pronounced. With the addition of 10 mM SDS to 28 mM SB-16 micellar solution, the emission maximum of C-343 dye shifted from 476 to 491 nm (Figure 2b) which remained the same on further increase of the SDS concentration (up to 30 mM). 请问这里的红移是什么原因导致的呢？为什么说产生红移之后这个小分子就移向了纯水中呢？而且，为什么SDS的效果更好呢？ |
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baoshanqiu
至尊木虫 (著名写手)
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2楼2015-10-14 22:19:01
白玉浴血
木虫 (正式写手)
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谢谢，可否再请教一下各向异性衰减的问题 These values decreased to 0.71, 0.47, and 0.41 ns on addition of 10, 20, and 30 mM EmimOs, respectively. A similar trend was also observed with the addition of SDS where the average rotationalrelaxation time of C-343 decreased from its value in neat SB-16 micellar solution to 0.51, 0.49, and 0.44 ns with gradual addition of 10, 20, and 30 mM SDS, respectively. The decrease in rotational relaxation time upon addition of EmimOs and SDS is an indication of the movement of the C343 dye from micellar palisade layer to bulk water, which is further supported by solvation dynamics study. We have observed that this effect is much more pronounced in presence of SDS compared to that for the RTIL. This can be ascribed to the presence of the long alkyl (dodecyl) chain of SDS which can orient itself and easily fuse inside the SB-16 micelle and help to migrate the probe molecule这里的各向异性衰减该怎么理解呢？非常感谢啦 |
3楼2015-10-15 07:59:37