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Effect of confinement to porous glass on structure and optical properties of alkylcyanobiphenyls.

Bezrodnaya T., Gavrilko T., Gnatyuk I., Yaroshchuk O., Puchkovskaya G., Baran J., Ratajczak H., Kukielski J.I.

Optica Applicata

2000

Vol. 30, nr 4

585-590

The 4-n-alkyl-4'-cyanobiphenyls (nCB, n is the number of carbon atoms in alkyl radical n=5, 8) confined to porous glasses with four different mean pore sizes (2, 4, 54 and 90 nm) have been studied. Using FT MIR and NIR spectroscopy methods we have investigated the interaction of nC8 molecules with the pore surface. It has been shown that the interaction is accompanied by the formation of hydrogen bonds between the SiOH group on the glass pore surface and the cyano-group of the nCB monomer. This is demonstrated by the change in the position and shape of CN stretching and Q(C identical to N)+Q(C=C) combination bands in the vibrational spectra of confined nCB depending on pore size and the length of the alkyl tail. To the contrary, in the case of benzophenone confined to PG, weak pi ...OH-Si hydrogen bonds are formed.

Carbon treatment as a method of the surface development of porous glasses

Gevelyuk S.A., Doycho I.K., Kovalenko M.P., Safronsky E.D., Rysiakiewicz-Pasek E., Roizin Y.O.

Optica Applicata

2000

Vol. 30, nr 4

635-640

A method to develop the structure of the internal pore surface is proposed. The surface of porous silicate glasses is modified by impregnating carbon into the pores and subsequent annealing. The procedure is repeated several times. A technique to control the properties of the pore surface is proposed as well. Analysing the change in the features of the photoluminescence spectrum as a result of such treatment in comparison with the pore-size distribution spectra allows us to assume formation of silicon nanoclusters in porous glass and to estimate their sizes. The nonmonotonic change of the surface development with simultaneous stationary increase of photoluminescence intensity is explained by the composite pattern of the silicon clusters change during multiple carbon treatments.