A simple solution process without the assistance of surfactant, catalyst, or template under ambient conditions in air has been used to prepare single-crystal hollow microtubes with a rectangular cross section from [2-(p-dimethylaminophenyl)ethenyl]phenylmethylenepropanedinitrile (DAPMP). The DAPMP microtubes (see picture for SEM images) show remarkably strong frequency-doubling nonlinear optical properties.
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Zhang et al. (2007) studied this question.
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