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The growth process of a helium cluster embedded in titanium crystal is explained by using molecular dynamic simulation. The results reveal that defects around the cluster are formed as the helium cluster grows and the local pressure increases.

Two D-A type phenothiazine derivatives were successfully designed and synthesized. Their typical solvatochromism was confirmed by spectroscopy. Experimental result also revealed that aggregation-induced emission (AIE) effect may be ascribed to the restriction of intramolecular rotation (RIR). Furthermore, both of them displayed blue-shifted mechanochromic behavior, which is clearly distinguished from their red-shifted precursor aldehyde. This kind of compound has a certain significance in the development and application of organic mechanochromic materials. [ABSTRACT FROM AUTHOR]