Unusual temperature dependence of the fluorescence decay in heterostructured stilbene.

Fluorescence spectra as well as the fluorescence decay kinetics of hot-pressed and sublimated films of stilbene have been studied in a wide temperature range, from 15 K up to room temperature. The fluorescence decay kinetics demonstrate unusual elongation of the excitation lifetime with a temperature increase. This is in contrast to the corresponding data of stilbene solutions in chloroform and in a polystyrene (PS) matrix.

Tuning a sign of magnetoelectric coupling in paramagnetic NH(CH)AlCr(SO) × 6HO crystals by metal ion substitution.

Hybrid organometallic systems offer a wide range of functionalities, including magnetoelectric (ME) interactions. However, the ability to design on-demand ME coupling remains challenging despite a variety of host-guest configurations and ME phases coexistence possibilities. Here, we report the effect of metal-ion substitution on the magnetic and electric properties in the paramagnetic ferroelectric NH(CH)Al Cr (SO) × 6HO.

Fluorescence relaxation kinetics of poly(methylphenylsilane) film and nanocomposites.

A comparative study of fluorescence relaxation kinetics of σ-conjugated poly(methylphenylsilane) (PMPS) polymer film and nanocomposites has been performed by ultrafast time-gated fluorescence measurements at various temperatures. Investigations have revealed a fine structure of excitonic σ-σ* band. We attribute this structure to emission from two spatially independent states with different ordering of the polymer chain segments, type gauche and trans conformations.

[Growth of a cell culture on porous capillaries].

The growth of BHK-21 culture cells on the outer surface and in the clear space of capillaries made of phenylone or polyacrylnitrile was studied. The cultivation of cells in the clear space of the capillary extends their survival time and outlines possible ways of continuous cultivation of tissue cells which are cultivated in the attached state.