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1
Content available remote Effect of antibiotic insertion on photoluminescent properties of silicate porous glasses used in ophthalmologic prostheses
100%
Rysiakiewicz-Pasek E. , Gevelyuk S. A. , Doycho I. K. , Prokopovich L. P. , Safronsky E. D.
Optica Applicata
|
2003
|
tom 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
Content available remote Physical adsorption in porous glasses
100%
Ovechko V. , Dmytruk A. , Mygashko V.
Optica Applicata
|
2003
|
tom Vol. 33, nr 1
41-44
EN
We have presented the results of our investigation concerning adsorption in porous glass (PG). Chemical adsorption of gas molecules is due to indicator substances which were deposited from solution on the surface of pores. Physical adsorption of organic molecules is due to OH-adsorption centres which are always arranged on the surface of PG at room temperature. Adsorption processes were investigated with infrared spectroscopy.
3
Content available remote Evaluation of thin Ta(N) film integrity deposited on porous glasses
100%
Shamiryan D. , Baklanov M. R. , Yanovitskaya A. V. , Zverev A. V. , Tőkei Z. , Iacopi F. , Maex K.
Optica Applicata
|
2003
|
tom Vol. 33, nr 1
91-96
EN
Porous glasses are widely used in microelectronics as inter-metal dielectrics with low dielectric constant (so-called low-k dielectrics). At the same time copper is used as a metal because of its low resistivity. Combination of Cu and low-k requires a barrier to prevent Cu diffusion into a low-k dielectric. Integrity of such a barrier becomes an issue when porous glass is used as a low-k dielectric. The barrier should be as thin as possible and fully dense at the same time. Using solvent (toluene) penetration through a barrier (tantalum nitride in our case, which is non-stoichiometric, hence denoted as Ta(N)) and adsorption in porous glass as a barrier integrity probe, we show that barrier integrity depends not only on porous structure of the glass, but also on its chemical composition (namely on carbon content). Glasses with high carbon content are easier to seal with Ta(N) barrier. With help of Monte Carlo simulations, we speculate that different chemical composition of the porous glass results in different surface diffusion during barrier deposition. Different surface diffusion, in turn, results in different integrity of the porous barrier.
4
Content available remote Small doses γ-irradiation effect on the photoluminescence properties of porous glasses
100%
Doycho I. K. , Gevelyuk S. A. , Kovalenko M. P. , Prokopovich L. P. , Rysiakiewicz-Pasek E.
Optica Applicata
|
2003
|
tom Vol. 33, nr 1
55-65
EN
The g-irradiation effect on the photoluminescence of various types of porous silica glasses and on its change during a half-year storage has been studied. It has been revealed that the photoluminescence intensity of glasses with fine matrix and almost complete absence of silica gel does not change when irradiated at applied doses, but a long-wave shift of its maximum position is observed. The increase in photoluminescence intensity appeared to be the most stable in glasses with the thick-wall matrix. The model which explains apparent changes in photo-luminescent properties and also allows us to draw conclusions about some features of various types of porous silicate glasses structure has been presented.
5
Content available remote Pore size determination by positron annihilation lifetime spectroscopy
84%
Jasińska B. , Dawidowicz A. L. , Goworek T. , Wawryszczuk J.
Optica Applicata
|
2003
|
tom Vol. 33, nr 1
7-12
EN
Two Vycor glasses were investigated using PALS method. The model of pick-off annihilation in cylindrical free volume was applied to evaluate the pore radii. The o-Ps mean lifetime value in the pores changed from 6.5 to 40 ns in one glass, while from 13 to 51 ns in the other (softer) one. The determined pore radii, using a cylindrical shape model, were from 0.5 to 1.4 nm and from 0.7 to 1.6 nm, respectively.
6
Content available remote Nanoparticles of lead sulfide in porous glasses prepared by the sol-gel method
84%
Reisfeld R. , Sarajdarov T. , Minti H. , Wodnicka K.
Optica Applicata
|
2003
|
tom Vol. 33, nr 1
61-73
EN
PbS semiconductor nanoparticles were grown inside the matrices of zirconium oxide (ZrO2) and zirconium-silica-polyurethane (ZSUR) prepared by the sol-gel method. Zirconium ormosil included polyurethane used to control the growth and aggregation of PbS nanoparticles. The new matrix allows the incorporation of up to 40% PbS forming a characteristic structure of dendrite by reacting lead acetate with ammonium thiocyanate in the sol-gel matrix. The sol precursors of the matrix for ZSUR contain ZrO2 matrix solution, epoxy-silica-ormosil (ESOR) and diurethane siloxane (DURS) synthesized separately. The size of nanoparticles as determined by transmission electron microscopy (TEM) ranges between 2–4 nm for 20% PbS in zirconium oxide and 8–10 nm for 20% PbS in ZSUR matrices. The porosity of the glasses is determined using the nitrogen adsorption technique. The pore size for ZSUR doped with 2% of PbS as determined by BET is 1.54 nm. Quantum size effect was observed from the shifts of absorption and photoluminescence (PL).
7
Content available remote Szkła porowate w procesie filtracji piwa.
84%
Środa M. , Szumera M. , Wodnicka K.
Szkło i Ceramika
|
2003
|
tom R. 54, nr 3
32-35
PL
W pracy przedstawiono proces otrzymywania szkła porowatego w oparciu o metodę z użyciem wypełniacza nieorganicznego (Na2SO4, K2SO4). Szkło to porównano z obecnie stosowana w przemyśle browarniczym ziemią okrzemkową. Wykonano badanie porowatości, gęstości i powierzchni właściwej. Przeprowadzone badania sedymentacji związków organicznych w piwie przed procesem filtracji wykazały, że otrzymane materiały, na bazie szkła Termisil, wpływają na zwiększenie szybkości sedymentacji, a co za tym idzie skrócenie czasu filtracji piwa.
EN
The process of porous glass formation by means of inorganic fillers (Na2SO4, K2SO4) was presented in the papaer. The properties of the glasses were compared with the diatomaceous earth used in the brewery industry nowadays. A porosity, density and the specific surface of the glass and diatomites were studied. It was observed the sedimentation process was hastened in the presence of the Termisil porous glass.
8
Content available remote Effect of confinement to porous glass on structure and optical properties of alkylcyanobiphenyls.
84%
Bezrodnaya T. , Gavrilko T. , Gnatyuk I. , Yaroshchuk O. , Puchkovskaya G. , Baran J. , Ratajczak H. , Kukielski J. I.
Optica Applicata
|
2000
|
tom Vol. 30, nr 4
585-590
EN
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.
9
Content available remote High radiation durability of optical elements made of porous glass.
84%
Meshkovsky I. K. , Safin V. M. , Stepanov V. E.
Optica Applicata
|
2000
|
tom Vol. 30, nr 4
591-593
EN
Optical properties of elements made of silicate porous glass are measured after their exposure to gamma -radiation. Extraordinary radiation durability of porous glass has been found and interpreted.
10
Content available remote Linear extension of porous glasses with modified internal surface in humid environment.
84%
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
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.
11
Content available remote Carbon treatment as a method of the surface development of porous glasses
84%
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
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.
12
Content available remote Influence of gamma -irradiation on the photoluminescent properties of porous glasses.
84%
Gevelyuk S. A. , Lishchuk D. E. , Mak V. T. , Rysiakiewicz-Pasek E. , Marczuk K.
Optica Applicata
|
2000
|
tom Vol. 30, nr 4
595-603
EN
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.
13
On-line calibration system for chromatographic detectors based on thermal decomposition process of surface compounds
84%
Przyk E. , Konieczka P. , Łobuch E. , Biernat J. F. , Namieśnik J.
Chemia i Inżynieria Ekologiczna
|
2001
|
tom Vol. 8, nr 8-9
905-910
EN
The preparation of gas standard mixtures of ethene, based on thermal decomposition of modified bed surfaces has been described. The aim of this research was to compare of results obtained for different porous materials (silica gel; porous glass) using for modification. Relations between amount of ethene liberated and thermal decomposition time have been determined and presented in as a mathematical equation.
PL
Opisano metodę sporządzania gazowych mieszanin wzorcowych etenu, wykorzystującą termiczny rozkład związków powierzchniowych. Celem pracy było porównanie wyników uzyskanych dla rożnych porowatych materiałów (żel krzemionkowy, szkło porowate) użytych w procesie modyfikacji. Wyznaczono też zależności między ilością powstającego etenu a czasem prowadzenia procesu termicznego rozkładu i opisano ją zależnością matematyczną.
14
Content available remote Ferroelektryki w szkłach porowatych
84%
Rysiakiewicz-Pasek E. , Poprawski R.
Szkło i Ceramika
|
2009
|
tom R. 60, nr 6
4-7
PL
W pracy przedstawiono metody wprowadzania wybranych materiałów ferroelektrycznych (TGS, NaN02 oraz KN03) w matryce szkieł porowatych o różnych średnich rozmiarach porów. Na podstawie pomiarów właściwości elektrycznych (piroelektrycznych i przenikalności elektrycznej) oraz termicznych (rozszerzalności termicznej i ciepła właściwego) stwierdzono, że w otrzymanych kompozytach sekwencje przemian fazowych są takie same jak w kryształach litych. Wykazano, że temperatury przemian fazowych zależą od rozmiarów porów.
EN
The methods of introducing of selected ferreoelectrics materials (TGS, NaN02 and KN03) into porous glasses matrix with different pores size were presented. On the basic on measurements of electrical (pyroelectric, dielectric permittivity) and thermal (thermal expansion, specific heat) properties it was stated that sequence of phase transitions are similar to those in bulk crystals. It was shown that the temperature of phase transitions depends on pore dimensions.
15
Content available remote Application of NIR spectroscopic method to the study of porous glasses filled with liquid crystals
67%
Gavrilko T. , Gnatyuk I. , Puchkovska G. , Baran J. , Marchewka M. , Morawska-Kowal T.
Optica Applicata
|
2003
|
tom Vol. 33, nr 1
23-32
EN
The paper focuses on NIR spectroscopic studies of the structure of surface active centers and interface interactions in novel nanocomposition materials built of nanoporous glasses (PG) and n-alkylcyanobiphenyl (nCB) liquid crystals (LC). NIR (12000–4000 cm–1) spectra of bare PG with pore size ranging from 2 to 10 nm and those loaded with nCB (n = 2, 4, 5, 8) were investigated at room temperature for two types of PG of variable surface activity preheated to 200 °C (type I) and 600 °C (type II). The number of surface active centers for the two types of PG has been evaluated as a function of pore diameter, and the relative number of the LC molecules directly bounded to the pore active centers was estimated.
16
Content available remote Optical properties and structure of porous glasses
67%
Evstrapov A. A. , Antropova T. V. , Drozdova I. A. , Yastrebov S. G.
Optica Applicata
|
2003
|
tom Vol. 33, nr 1
45-54
EN
The results of measurements concerning spectral dependences of transmission and reflection coefficients both for porous and two-phase glasses are presented. Relative estimations have been performed for transmission and reflection coefficients of examined samples. Optical characteristics, such as the dispersion of refractive index and absorption coefficient, have been found for porous glasses. Porosity of the material and the sizes of micropores have been determined from the optical characteristics of glasses with the assumption of identity and uniformity of pores.
17
Content available remote Sintering of optical porous glasses
67%
Antropova T. V. , Drozdova I. A.
Optica Applicata
|
2003
|
tom Vol. 33, nr 1
13-22
EN
The changes in the visible light transmission of the optical porous glasses (PGs), arising from PGs thermal treatment, have been investigated by transmission electron microscopy and optical spectroscopy technique. Also the PGs thermal properties such as linear shrinkage and viscosity have been studied. These PGs are used in optics and laser technology as the base for the micro- optical elements produced by a local laser sintering of PGs.
18
Content available remote Formation of microoptical elements in the bulk of composition material on the basis of porous glass.
67%
Klim O. V. , Meshkovsky I. K.
Optica Applicata
|
2000
|
tom Vol. 30, nr 4
577-579
EN
The possibilities of the formation of microoptical elements in the bulk of composite material on the basis of porous glass have been investigated. It has been demonstrated that due to the local laser heating-up of composition material, the local desorption of the adsorbate from a porous matrix is initiated that causes formation of microlenses. Other possibilities of microoptical filters formation have been studied based on electrodiffusion immobilization of dye ions. Characteristics of such elements are studied and possible applications are discussed.
19
Content available remote Porous glass: inhomogeneities and light transmission.
67%
Antropova T. V. , Drozdova I. A. , Yastrebov S. G. , Evstrapov A. A.
Optica Applicata
|
2000
|
tom Vol. 30, nr 4
553-568
EN
Basic optical characteristics were studied to reveal the structure of porous glass samples. Acid leaching technology was used to manufacture porous glasses from the bulk of phase-separated alkali borosilicate glasses. The transmission electron microscopy, selected area diffraction and shadow graph techniques, optical microscopy and spectrophotometry, reflective ellipsometry were used to obtain new information about some inhomogeneities such as strata and spindle-like silica precipitates as well as boron containing microcrystalline phases inside porous glasses.
20
Content available remote Optical gate controlled by temperature.
67%
Meshkovsky I. K. , Fuad M. A. , Alyev F. M. , Baushev V. N.
Optica Applicata
|
2000
|
tom Vol. 30, nr 4
581-583
EN
Light scattering and transmission of a porous silicate glass-based composition material with poly-2-ethylhexylactylate immobilized in the pores have been investigated. A temperature transition (47-50 degrees C) in transmittance has been observed and interpreted. The hysteresis found indicates that the second order transition occurs.
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