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1

Effect of antibiotic insertion on photoluminescent properties of silicate porous glasses used in ophthalmologic prostheses

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

Optica Applicata

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2003

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Vol. 33, nr 1

33-39

EN

The selection of silica porous glass being the most suitable material for manufacturing of the actuated scleral part of the eye prosthesis has been justified. The model explaining the photoluminescence intensity oscillations of porous glass during the effusion of the antibiotic out of the glass has been proposed. Multiple usage of the antibiotic has been found to lead to the etching effect of the porous glass and a method of minimization of the effect has been presented.

2

Humidity dependencies of porous sol-gel and silica glass linear sizes

Geveluyk S. A., Doycho I. K., Prokopovich L. P., Rysiakiewicz-Pasek E., Safronsky E. D.

Materials Science

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2002

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Vol. 20, No. 2

23-27

EN

Measurements of the porous sol-gel and porous silica glass linear size dependencies on humidity of the surrounding atmosphere were performed using the interferometric techniques. The secondary silica gel existing in the voids of silica porous glasses is absent in the sol-gel glasses. The pore size distributions have two peaks for the sol-gel glass while there are several peaks with decreasing amplitudes in the silica porous glass. The differences in the linear sizes moisture sensitivity are explained by the structure of both types of porous materials. The capillary effects prevail in the last ones. The revealed peculiarities of sol-gel glasses make it possible to develop threshold humidity sensors of the new type.

3

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

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2000

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Vol. 30, nr 4

605-611

EN

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.

4

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

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2000

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Vol. 30, nr 4

635-640

EN

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.