期刊
CHEMPLUSCHEM
卷 80, 期 10, 页码 1502-1507出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/cplu.201500300
关键词
amplification; helical structures; molecular tuning; nanoparticles; precipitation
资金
- Japan Society for the Promotion of Science (JSPS) [25249108]
- JSPS [25-7469]
- Grants-in-Aid for Scientific Research [25249108] Funding Source: KAKEN
Material clocking is an important biological phenomenon through which the structure of a material changes sharply with time after activation. A suspension of silica (P)-nanoparticles in the presence of organic molecules in solution exhibits such a material clocking phenomenon during delayed precipitation with high accuracy and precision. A mixture of ethynylhelicene (P)-pentamer and silica (P)-nanoparticles with an average diameter of 70 nm grafted with (P)-helicene in trifluoromethylbenzene is sonicated for activation and dispersion. The (P)-nanoparticles start to precipitate after 3 h of settling at 25 degrees C and precipitate completely after 4 h. UV/Vis, CD, and DLS analyses of the process show no change during the initial 3 h, but then an abrupt stair-shaped kinetic change occurs with concomitant precipitation and removal of the (P)-pentamer from the solution phase. The delay in the precipitation can be tuned by the structure of molecules added to the (P)-nanoparticle suspension.
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