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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.

100%

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

Optica Applicata

2000

tom 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.

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

100%

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

Optica Applicata

2000

tom 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.