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2 Optica Applicata

2 2000

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Linear extension of porous glasses with modified internal surface in humid environment.

Gevelyuk S. A., Doycho I. K., Lishchuk D. E., Prokopovich L. P., Safronsky E. D., Rysiakiewicz-Pasek E., Roizin Y. O.

Optica Applicata

2000

Vol. 30, nr 4

605-611

An original interferometric technique for investigating the influence of humidity on change in the linear dimensions of porous silica glasses is developed. The linear dimensions of a specimen are shown to change as a result of competition in the system of compressive capillary forces and expansion forces arising from the swelling of the residual silica gel present in pores. The possibility of selective inhibition of the capillary squeezing forces or the silica gel expansion forces by the pre-treatment of a porous material by a hydrophobized composition (hexamethyldisilazan - HMDS) or by annealing of carbon impregnated inside of the pores is shown experimentally.

Influence of gamma -irradiation on the photoluminescent properties of porous glasses.

Gevelyuk S.A., Lishchuk D.E., Mak V.T., Rysiakiewicz-Pasek E., Marczuk K.

Optica Applicata

2000

Vol. 30, nr 4

595-603

The influence of small doses of gamma -irradiation on the features of the photoluminescence spectra of porous silica glass during long-time (several months) storage after the irradiation is investigated. The non-monotonic dependence of photoluminescence change on the dose of the glasses with a different composition and different additional pre-treatment is observed. The analysis of intensity changes and shifts of the maxims of the photoluminescence spectra shows long-time oscillations. This indicates that the composite catalytic processes take place on the surface of the pores. Perhaps the small gamma -radiation doses initiate the cyclic process of the surface state transformation on the inner side of the pores.