37 research outputs found
Photocatalytic Properties of Sn-doped TiO2
The synthesis of Sn-doped titania nanoparticles (Sn content of 0, 3, 6, and 12 at. %) was carried out using solgel chemical route based on the common acid hydrolysis of titanium and tin tetrachlorides. Phase composition,
morphology, particle size, pore size distribution and photocatalytic performance of obtained materials were systematically studied by various analytical techniques (XRD, HR-TEM, low-temperature nitrogen adsorption porosimetry, UV-Vis spectroscopy). An increase in the Sn dopant concentration causes a gradual decrease in the
relative content of the anatase phase from 100 mol. % for undoped titania to about 3 mol. % for material with
maximal doping concentration. Materials with a Sn atomic content of 3 and 6 at. % have the maximum values of
the specific surface area (about 280-290 m2/g) that corresponds to the smallest (approximately 2.5 nm) anatase
crystallite. The photocatalytic activity of the synthesized Sn-doped TiO2 nanoparticles was analyzed by the
method of methylene blue dye photodegradation in an aqueous solution under UV irradiation. The highest reaction rate constant and maximal methylene blue dye adsorption capacity were obtained for 3 at. % Sn-doped titania with the mixed anatase/rutile composition. The indirect optical transitions are characteristic for all synthesized materials. A decrease in the bandgap energy values with increasing Sn content from 3.21 eV for pure anatase to 2.82 eV for titania doped with 12 at. % of the Sn was observed. The growth in photocatalytic activity for
the mixed-phase sample can be considered as a result of the increasing number of surface active centers due to
the anatase-rutile phase transition
ΠΠ΅ΠΎΠΌΠ΅ΡΡΠΈΡΠ½Π΅ ΡΠ° ΠΌΠ΅Ρ Π°Π½ΠΎ-ΡΠΎΡΠ±ΡΡΠΉΠ½Π΅ ΠΌΠΎΠ΄ΠΈΡΡΠΊΡΠ²Π°Π½Π½Ρ Π²ΠΈΡΠΎΠΊΠΎΠ΄ΠΈΡΠΏΠ΅ΡΡΠ½ΠΎΠ³ΠΎ ΠΊΡΠ΅ΠΌΠ½Π΅Π·Π΅ΠΌΡ Π² ΡΠΌΠΎΠ²Π°Ρ Π³Π°Π·ΠΎΠ²ΠΎΠ³ΠΎ Π΄ΠΈΡΠΏΠ΅ΡΡΡΠΉΠ½ΠΎΠ³ΠΎ ΡΠ΅ΡΠ΅Π΄ΠΎΠ²ΠΈΡΠ°
Methods of geometric and solvate-stymulated mechano-sorption-activated modification of fumed nanosilica in the gaseous dispersion media were developed and used to prepare functionalyzed nanofillers for polymeric systems. Non-volatile high- and low-molecular weight compounds (such as polymers, organic bioactive compounds, organic and inorganic salts) can be used as modifiers of nanofillers.ΠΡΠ»ΠΈ ΠΎΠΏΠΈΡΠ°Π½Ρ Π³Π΅ΠΎΠΌΠ΅ΡΡΠΈΡΠ½Π΅ ΡΠ° ΡΠΎΠ»ΡΠ²Π°ΡΠΎ-ΡΡΠΈΠΌΡΠ»ΡΠΎΠ²Π°Π½Π΅ ΠΌΠ΅Ρ
Π°Π½ΠΎΡΠΎΡΠ±ΡΡΠΉΠ½Π΅ ΠΌΠΎΠ΄ΠΈΡΡΠΊΡΠ²Π°Π½Π½Ρ Π²ΠΈΡΠΎΠΊΠΎΠ΄ΠΈΡΠΏΠ΅ΡΡΠ½ΠΎΠ³ΠΎ ΠΊΡΠ΅ΠΌΠ½Π΅Π·Π΅ΠΌΡ Π² ΡΠΌΠΎΠ²Π°Ρ
Π³Π°Π·ΠΎΠ²ΠΎΠ³ΠΎ Π΄ΠΈΡΠΏΠ΅ΡΡΡΠΉΠ½ΠΎΠ³ΠΎ ΡΠ΅ΡΠ΅Π΄ΠΎΠ²ΠΈΡΠ°. Π’Π°ΠΊΡ ΡΠΏΠΎΡΠΎΠ±ΠΈ ΠΌΠΎΠ΄ΠΈΡΡΠΊΡΠ²Π°Π½Π½Ρ Π΄ΠΎΠ·Π²ΠΎΠ»ΡΡΡΡ ΠΎΠ΄Π΅ΡΠΆΡΠ²Π°ΡΠΈ ΡΡΠ½ΠΊΡΡΠΎΠ½Π°Π»ΡΠ·ΠΎΠ²Π°Π½Ρ Π½Π°ΠΏΠΎΠ²Π½ΡΠ²Π°ΡΡ ΠΏΠΎΠ»ΡΠΌΠ΅ΡΠ½ΠΈΡ
ΡΠΈΡΡΠ΅ΠΌ Π½Π° ΠΎΡΠ½ΠΎΠ²Ρ Π½Π°Π½ΠΎΡΠΎΠ·ΠΌΡΡΠ½ΠΎΠ³ΠΎ ΠΊΡΠ΅ΠΌΠ½Π΅Π·Π΅ΠΌΡ. ΠΠ»Ρ ΠΌΠΎΠ΄ΠΈΡΡΠΊΡΠ²Π°Π½Π½Ρ ΠΌΠΎΠΆΠ½Π° Π²ΠΈΠΊΠΎΡΠΈΡΡΠΎΠ²ΡΠ²Π°ΡΠΈ Π½Π΅Π»Π΅ΡΠΊΡ Π²ΠΈΡΠΎΠΊΠΎ- ΡΠ° Π½ΠΈΠ·ΡΠΊΠΎΠΌΠΎΠ»Π΅ΠΊΡΠ»ΡΡΠ½Ρ ΠΎΡΠ³Π°Π½ΡΡΠ½Ρ ΡΠΏΠΎΠ»ΡΠΊΠΈ β ΠΏΠΎΠ»ΡΠΌΠ΅ΡΠΈ, Π±ΡΠΎΠ»ΠΎΠ³ΡΡΠ½ΠΎ Π°ΠΊΡΠΈΠ²Π½Ρ ΡΠΏΠΎΠ»ΡΠΊΠΈ, ΠΎΡΠ³Π°Π½ΡΡΠ½Ρ ΡΠΎΠ»Ρ, Π° ΡΠ°ΠΊΠΎΠΆ Π½Π΅ΠΎΡΠ³Π°Π½ΡΡΠ½Ρ ΡΠΎΠ»Ρ
Interaction of Red Blood Cells with Fumed SiO2, Al2O3/SiO2 and TiO2/SiO2 by Light Scattering Measurements
The interaction of human red blood cells (RBCs) with fumed silica and fumed X/SiO2 (X = Al2O3, TiO2) at different concentrations of X oxide was studied by flow cytometry and photon correlation spectroscopy. The light scattering of RBCs affected by oxides in conjunction with the hemolysis degree showed that mixed oxides (X/SiO2), in general, had less membranotoxic effect than pure silica. The interaction of RBCs with fumed silica and other mixed oxides is a convenient model to examine membranotoxicity and biocompatibility of disperse materials. Flow cytometry and photon correlation spectroscopy are informative methods to study the mechanism of hemolysis induced by solid micro- or nanoparticles.ΠΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ ΠΏΡΠΎΡΠΎΡΠ½ΠΎΡ ΡΠΈΡΠΎΠΌΠ΅ΡΡΡΡ ΡΠ° Π»Π°Π·Π΅ΡΠ½ΠΎΡ ΠΊΠΎΡΠ΅Π»ΡΡΡΠΉΠ½ΠΎΡ ΡΠΏΠ΅ΠΊΡΡΠΎΡΠΊΠΎΠΏΡΡ Π΄ΠΎΡΠ»ΡΠ΄ΠΆΠ΅Π½ΠΎ Π²Π·Π°ΡΠΌΠΎΠ΄ΡΡ Π΅ΡΠΈΡΡΠΎΡΠΈΡΡΠ² Π»ΡΠ΄ΠΈΠ½ΠΈ Π· ΠΏΡΡΠΎΠ³Π΅Π½Π½ΠΈΠΌΠΈ ΠΎΠΊΡΠΈΠ΄Π°ΠΌΠΈ β Π½Π΅ΠΌΠΎΠ΄ΠΈΡΡΠΊΠΎΠ²Π°Π½ΠΈΠΌ ΠΊΡΠ΅ΠΌΠ½Π΅Π·Π΅ΠΌΠΎΠΌ Ρ Π·ΠΌΡΡΠ°Π½ΠΈΠΌΠΈ ΠΎΠΊΡΠΈΠ΄Π°ΠΌΠΈ X/SiO2 (X = Al2O3, TiO2) Π· ΡΡΠ·Π½ΠΈΠΌ Π²ΠΌΡΡΡΠΎΠΌ X. Π Π΅Π·ΡΠ»ΡΡΠ°ΡΠΈ Π²ΠΈΠΌΡΡΡΠ²Π°Π½Π½Ρ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΡΠ² ΡΠ²ΡΡΠ»ΠΎΡΠΎΠ·ΡΡΡΠ²Π°Π½Π½Ρ Ρ ΠΏΠΎΡΠ΄Π½Π°Π½Π½Ρ Π· Π²ΠΈΠ·Π½Π°ΡΠ΅Π½Π½ΡΠΌ ΡΡΡΠΏΠ΅Π½Ρ Π³Π΅ΠΌΠΎΠ»ΡΠ·Ρ Π΅ΡΠΈΡΡΠΎΡΠΈΡΡΠ² ΡΠ²ΡΠ΄ΡΠ°ΡΡ, ΡΠΎ Π·ΠΌΡΡΠ°Π½Ρ ΠΎΠΊΡΠΈΠ΄ΠΈ Π² ΡΡΠ»ΠΎΠΌΡ ΠΏΡΠΎΡΠ²Π»ΡΡΡΡ ΠΌΠ΅Π½ΡΡ ΠΌΠ΅ΠΌΠ±ΡΠ°Π½ΠΎΡΠΎΠΊΡΠΈΡΠ½Ρ Π΄ΡΡ Ρ ΠΏΠΎΡΡΠ²Π½ΡΠ½Π½Ρ Π· Π½Π΅ΠΌΠΎΠ΄ΠΈΡΡΠΊΠΎΠ²Π°Π½ΠΈΠΌ ΠΊΡΠ΅ΠΌΠ½Π΅Π·Π΅ΠΌΠΎΠΌ. ΠΠ·Π°ΡΠΌΠΎΠ΄ΡΡ Π΅ΡΠΈΡΡΠΎΡΠΈΡΡΠ² Π»ΡΠ΄ΠΈΠ½ΠΈ Π· ΠΏΡΡΠΎΠ³Π΅Π½Π½ΠΈΠΌ ΠΊΡΠ΅ΠΌΠ½Π΅Π·Π΅ΠΌΠΎΠΌ ΡΠ° ΡΠ½ΡΠΈΠΌΠΈ Π·ΠΌΡΡΠ°Π½ΠΈΠΌΠΈ ΠΎΠΊΡΠΈΠ΄Π°ΠΌΠΈ Ρ Π·ΡΡΡΠ½ΠΎΡ ΠΌΠΎΠ΄Π΅Π»Π»Ρ Π΄Π»Ρ ΡΠ΅ΡΡΡΠ²Π°Π½Π½Ρ ΠΌΠ΅ΠΌΠ±ΡΠ°Π½ΠΎΡΠΎΠΊΡΠΈΡΠ½ΠΎΡΡΡ/Π±ΡΠΎΡΡΠΌΡΡΠ½ΠΎΡΡΡ Π΄ΠΈΡΠΏΠ΅ΡΡΠ½ΠΈΡ
ΠΌΠ°ΡΠ΅ΡΡΠ°Π»ΡΠ². ΠΡΠΎΡΠΎΡΠ½Π° ΡΠΈΡΠΎΠΌΠ΅ΡΡΡΡ Ρ Π»Π°Π·Π΅ΡΠ½Π° ΠΊΠΎΡΠ΅Π»ΡΡΡΠΉΠ½Π° ΡΠΏΠ΅ΠΊΡΡΠΎΡΠΊΠΎΠΏΡΡ Ρ ΡΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠ²Π½ΠΈΠΌΠΈ ΠΌΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ Π΄Π»Ρ Π²ΠΈΠ²ΡΠ΅Π½Π½Ρ ΠΌΠ΅Ρ
Π°Π½ΡΠ·ΠΌΡ Π³Π΅ΠΌΠΎΠ»ΡΠ·Ρ, ΡΠ½Π΄ΡΠΊΠΎΠ²Π°Π½ΠΎΠ³ΠΎ ΡΠ²Π΅ΡΠ΄ΠΈΠΌΠΈ ΡΠ°ΡΡΠΈΠ½ΠΊΠ°ΠΌΠΈ.ΠΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ ΠΏΡΠΎΡΠΎΡΠ½ΠΎΠΉ ΡΠΈΡΠΎΠΌΠ΅ΡΡΠΈΠΈ ΠΈ Π»Π°Π·Π΅ΡΠ½ΠΎΠΉ ΠΊΠΎΡΡΠ΅Π»ΡΡΠΈΠΎΠ½Π½ΠΎΠΉ ΡΠΏΠ΅ΠΊΡΡΠΎΡΠΊΠΎΠΏΠΈΠΈ ΠΈΠ·ΡΡΠ΅Π½ΠΎ Π²Π·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΠ΅ ΡΡΠΈΡΡΠΎΡΠΈΡΠΎΠ² ΡΠ΅Π»ΠΎΠ²Π΅ΠΊΠ° Ρ ΠΏΠΈΡΠΎΠ³Π΅Π½Π½ΡΠΌΠΈ ΠΎΠΊΡΠΈΠ΄Π°ΠΌΠΈ β Π½Π΅ΠΌΠΎΠ΄ΠΈΡΠΈΡΠΈΡΠΎΠ²Π°Π½Π½ΡΠΌ ΠΊΡΠ΅ΠΌΠ½Π΅Π·Π΅ΠΌΠΎΠΌ ΠΈ ΡΠΌΠ΅ΡΠ°Π½ΡΠΌΠΈ ΠΎΠΊΡΠΈΠ΄Π°ΠΌΠΈ X/SiO2 (X = Al2O3, TiO2) Ρ ΡΠ°Π·Π½ΡΠΌ ΡΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΠ΅ΠΌ X. Π Π΅Π·ΡΠ»ΡΡΠ°ΡΡ ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΡ ΠΏΠ°ΡΠ°ΠΌΠ΅ΡΡΠΎΠ² ΡΠ²Π΅ΡΠΎΡΠ°ΡΡΠ΅ΡΠ½ΠΈΡ ΡΠΎΠ²ΠΌΠ΅ΡΡΠ½ΠΎ Ρ ΠΎΠΏΡΠ΅Π΄Π΅Π»Π΅Π½ΠΈΠ΅ΠΌ ΡΡΠ΅ΠΏΠ΅Π½ΠΈ Π³Π΅ΠΌΠΎΠ»ΠΈΠ·Π° ΡΡΠΈΡΡΠΎΡΠΈΡΠΎΠ² ΡΠ²ΠΈΠ΄Π΅ΡΠ΅Π»ΡΡΡΠ²ΡΡΡ, ΡΡΠΎ ΡΠΌΠ΅ΡΠ°Π½Π½ΡΠ΅ ΠΎΠΊΡΠΈΠ΄Ρ Π² ΡΠ΅Π»ΠΎΠΌ ΠΎΠ±Π»Π°Π΄Π°ΡΡ ΠΌΠ΅Π½ΡΡΠΈΠΌ ΠΌΠ΅ΠΌΠ±ΡΠ°Π½ΠΎΡΠΎΠΊΡΠΈΡΠ΅ΡΠΊΠΈΠΌ Π΄Π΅ΠΉΡΡΠ²ΠΈΠ΅ΠΌ Π² ΡΡΠ°Π²Π½Π΅Π½ΠΈΠΈ Ρ Π½Π΅ΠΌΠΎΠ΄ΠΈΡΠΈΡΠΈΡΠΎΠ²Π°Π½Π½ΡΠΌ ΠΊΡΠ΅ΠΌΠ½Π΅Π·Π΅ΠΌΠΎΠΌ. ΠΠ·Π°ΠΈΠΌΠΎΠ΄Π΅ΠΉΡΡΠ²ΠΈΠ΅ ΡΡΠΈΡΡΠΎΡΠΈΡΠΎΠ² ΡΠ΅Π»ΠΎΠ²Π΅ΠΊΠ° Ρ ΠΏΠΈΡΠΎΠ³Π΅Π½Π½ΡΠΌ ΠΊΡΠ΅ΠΌΠ½Π΅Π·Π΅ΠΌΠΎΠΌ ΠΈ Π΄ΡΡΠ³ΠΈΠΌΠΈ ΡΠΌΠ΅ΡΠ°Π½ΡΠΌΠΈ ΠΎΠΊΡΠΈΠ΄Π°ΠΌΠΈ ΠΌΠΎΠΆΠ½ΠΎ ΡΠ°ΡΡΠΌΠ°ΡΡΠΈΠ²Π°ΡΡ ΠΊΠ°ΠΊ ΡΠ΄ΠΎΠ±Π½ΡΡ ΠΌΠΎΠ΄Π΅Π»Ρ Π΄Π»Ρ ΠΈΡΠΏΡΡΠ°Π½ΠΈΡ Π΄ΠΈΡΠΏΠ΅ΡΡΠ½ΡΡ
ΠΌΠ°ΡΠ΅ΡΠΈΠ°Π»ΠΎΠ² Π½Π° ΠΌΠ΅ΠΌΠ±ΡΠ°Π½ΠΎΡΠΎΠΊΡΠΈΡΠ½ΠΎΡΡΡ/ Π±ΠΈΠΎΡΠΎΠ²ΠΌΠ΅ΡΡΠΈΠΌΠΎΡΡΡ. ΠΡΠΎΡΠΎΡΠ½Π°Ρ ΡΠΈΡΠΎΠΌΠ΅ΡΡΠΈΡ ΠΈ Π»Π°Π·Π΅ΡΠ½Π°Ρ ΠΊΠΎΡΡΠ΅Π»ΡΡΠΈΠΎΠ½Π½Π°Ρ ΡΠΏΠ΅ΠΊΡΡΠΎΡΠΊΠΎΠΏΠΈΡ ΡΠ²Π»ΡΡΡΡΡ ΠΈΠ½ΡΠΎΡΠΌΠ°ΡΠΈΠ²Π½ΡΠΌΠΈ ΠΌΠ΅ΡΠΎΠ΄Π°ΠΌΠΈ Π΄Π»Ρ ΠΈΠ·ΡΡΠ΅Π½ΠΈΡ ΠΌΠ΅Ρ
Π°Π½ΠΈΠ·ΠΌΠ° Π³Π΅ΠΌΠΎΠ»ΠΈΠ·Π°, ΠΈΠ½Π΄ΡΡΠΈΡΠΎΠ²Π°Π½Π½ΠΎΠ³ΠΎ ΡΠ²Π΅ΡΠ΄ΡΠΌΠΈ ΡΠ°ΡΡΠΈΡΠ°ΠΌΠΈ
Influence of Solution pH on Stability of Fumed SilicaβPolyacrylic Acid Systems
The influence of polyacrlic acid (PAA) adsorption on fumed silica (SiO2) surface on suspension stability has been studied. Π‘hanges in the suspension stability were monitored using a Turbiscan LabExpert with a TLAb Cooler cooling module at 25oC. PAA is an anionic polymer containing carboxyl groups; therefore all the measurements were carried out at different pH 3, 6 and 9. Analysis of obtained transmission and backscattering curves and Turbiscan Stability Indexes (TSI) allowed determination of the most probable mechanism of the system stability.ΠΠΈΠ²ΡΠ΅Π½ΠΎ Π²ΠΏΠ»ΠΈΠ² Π°Π΄ΡΠΎΡΠ±ΡΡΡ ΠΏΠΎΠ»ΡΠ°ΠΊΡΠΈΠ»ΠΎΠ²ΠΎΡ ΠΊΠΈΡΠ»ΠΎΡΠΈ (ΠAΠ) Π½Π° ΠΏΠΎΠ²Π΅ΡΡ
Π½Ρ Π²ΠΈΡΠΎΠΊΠΎΠ΄ΠΈΡΠΏΠ΅ΡΡΠ½ΠΎΠ³ΠΎ ΠΊΡΠ΅ΠΌΠ½Π΅Π·Π΅ΠΌΡ (SiO2) Π½Π° ΡΡΠ°Π±ΡΠ»ΡΠ½ΡΡΡΡ ΡΡΡΠΏΠ΅Π½Π·ΡΡ. ΠΠΌΡΠ½ΠΈ ΡΡΠ°Π±ΡΠ»ΡΠ½ΠΎΡΡΡ ΡΡΡΠΏΠ΅Π½Π·ΡΡ ΡΠΏΠΎΡΡΠ΅ΡΡΠ³Π°Π»ΠΈΡΡ Π·Π° Π΄ΠΎΠΏΠΎΠΌΠΎΠ³ΠΎΡ ΠΏΡΠΈΠ»Π°Π΄Ρ Turbiscan LabExpert ΡΠ· ΠΎΡ
ΠΎΠ»ΠΎΠ΄ΠΆΡΡΡΠΈΠΌ ΠΌΠΎΠ΄ΡΠ»Π΅ΠΌ TLAb Cooler ΠΏΡΠΈ 25oC. ΠAΠ Ρ Π°Π½ΡΠΎΠ½Π½ΠΈΠΌ ΠΏΠΎΠ»ΡΠΌΠ΅ΡΠΎΠΌ, ΡΠΎ ΠΌΡΡΡΠΈΡΡ ΠΊΠ°ΡΠ±ΠΎΠΊΡΠΈΠ»ΡΠ½Ρ Π³ΡΡΠΏΠΈ, ΡΠΎΠΌΡ Π²ΡΡ Π²ΠΈΠΌΡΡΡΠ²Π°Π½Π½Ρ ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»ΠΈΡΡ ΠΏΡΠΈ ΡΡΠ·Π½ΠΈΡ
ΡΠ (3, 6 ΡΠ° 9). ΠΠ½Π°Π»ΡΠ· ΠΎΠ΄Π΅ΡΠΆΠ°Π½ΠΈΡ
ΠΊΡΠΈΠ²ΠΈΡ
ΠΏΠ΅ΡΠ΅Π½Π΅ΡΠ΅Π½Π½Ρ ΡΠ° Π·Π²ΠΎΡΠΎΡΠ½ΡΠΎΠ³ΠΎ ΡΠΎΠ·ΡΡΡΠ½Π½Ρ, Π° ΡΠ°ΠΊΠΎΠΆ ΡΠ½Π΄Π΅ΠΊΡΡΠ² ΡΡΠ°Π±ΡΠ»ΡΠ½ΠΎΡΡΡ (Turbiscan Stability Indexes (TSI)) Π΄ΠΎΠ·Π²ΠΎΠ»ΠΈΠ² Π²ΠΈΠ·Π½Π°ΡΠΈΡΠΈ Π½Π°ΠΉΠ±ΡΠ»ΡΡ Π²ΡΡΠΎΠ³ΡΠ΄Π½ΠΈΠΉ ΠΌΠ΅Ρ
Π°Π½ΡΠ·ΠΌ ΡΡΠ°Π±ΡΠ»ΡΠ·Π°ΡΡΡ Π²ΠΈΠ²ΡΠ΅Π½ΠΈΡ
ΡΠΈΡΡΠ΅ΠΌ.ΠΠ·ΡΡΠ΅Π½ΠΎ Π²Π»ΠΈΡΠ½ΠΈΠ΅ Π°Π΄ΡΠΎΡΠ±ΡΠΈΠΈ ΠΏΠΎΠ»ΠΈΠ°ΠΊΡΠΈΠ»ΠΎΠ²ΠΎΠΉ ΠΊΠΈΡΠ»ΠΎΡΡ (ΠAA) Π½Π° ΠΏΠΎΠ²Π΅ΡΡ
Π½ΠΎΡΡΠΈ Π²ΡΡΠΎΠΊΠΎΠ΄ΠΈΡΠΏΠ΅ΡΡΠ½ΠΎΠ³ΠΎ ΠΊΡΠ΅ΠΌΠ½Π΅Π·Π΅ΠΌΠ° (SiO2) Π½Π° ΡΡΠ°Π±ΠΈΠ»ΡΠ½ΠΎΡΡΡ ΡΡΡΠΏΠ΅Π½Π·ΠΈΠΈ. ΠΠ·ΠΌΠ΅Π½Π΅Π½ΠΈΡ ΡΡΠ°Π±ΠΈΠ»ΡΠ½ΠΎΡΡΠΈ ΡΡΡΠΏΠ΅Π½Π·ΠΈΠΈ Π½Π°Π±Π»ΡΠ΄Π°Π»ΠΈΡΡ Ρ ΠΏΠΎΠΌΠΎΡΡΡ ΠΏΡΠΈΠ±ΠΎΡΠ° Turbiscan LabExpert Ρ ΠΎΡ
Π»Π°ΠΆΠ΄Π°ΡΡΠΈΠΌ ΠΌΠΎΠ΄ΡΠ»Π΅ΠΌ TLAb Cooler ΠΏΡΠΈ 25oC. PAA ΡΠ²Π»ΡΠ΅ΡΡΡ Π°Π½ΠΈΠΎΠ½Π½ΡΠΌ ΠΏΠΎΠ»ΠΈΠΌΠ΅ΡΠΎΠΌ, ΡΠΎΠ΄Π΅ΡΠΆΠ°ΡΠΈΠΌ ΠΊΠ°ΡΠ±ΠΎΠΊΡΠΈΠ»ΡΠ½ΡΠ΅ Π³ΡΡΠΏΠΏΡ, ΠΏΠΎΡΡΠΎΠΌΡ Π²ΡΠ΅ ΠΈΠ·ΠΌΠ΅ΡΠ΅Π½ΠΈΡ ΠΏΡΠΎΠ²ΠΎΠ΄ΠΈΠ»ΠΈΡΡ ΠΏΡΠΈ ΡΠ°Π·Π»ΠΈΡΠ½ΡΡ
ΡΠ (3, 6 ΠΈ 9). ΠΠ½Π°Π»ΠΈΠ· ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΡΡ
ΠΊΡΠΈΠ²ΡΡ
ΠΏΠ΅ΡΠ΅Π½ΠΎΡΠ° ΠΈ ΠΎΠ±ΡΠ°ΡΠ½ΠΎΠ³ΠΎ ΡΠ°ΡΡΠ΅ΡΠ½ΠΈΡ, Π° ΡΠ°ΠΊΠΆΠ΅ ΠΈΠ½Π΄Π΅ΠΊΡΠΎΠ² ΡΡΠ°Π±ΠΈΠ»ΡΠ½ΠΎΡΡΠΈ (Turbiscan Stability Indexes (TSI)) ΠΏΠΎΠ·Π²ΠΎΠ»ΠΈΠ» ΠΎΠΏΡΠ΅Π΄Π΅Π»ΠΈΡΡ Π½Π°ΠΈΠ±ΠΎΠ»Π΅Π΅ Π²Π΅ΡΠΎΡΡΠ½ΡΠΉ ΠΌΠ΅Ρ
Π°Π½ΠΈΠ·ΠΌ ΡΡΠ°Π±ΠΈΠ»ΠΈΠ·Π°ΡΠΈΠΈ ΠΈΠ·ΡΡΠ΅Π½Π½ΡΡ
ΡΠΈΡΡΠ΅ΠΌ
Role of dipole image forces in molecular adsorption
Electrostatic image force energy W was calculated for a finite-size (extended) dipole located in vacuum near a plane surface of a condensed-matter substrate using the HF molecule over graphite as an example. The spatial dispersion of substrate static dielectric permittivity was taken into account, with the contributions of both free and bound charge carriers being considered in various realistic models. The dependences of W on the distance z between the dipole and the substrate were shown to be finite at all zβs, contrary to the classical point-dipole case. An existence of a crossover between the preferable normal and planar orientations of extended dipole with respect to the surface was found. The applicability of point-dipole approximation for the calculation of W(z) was discussed. Numerical quantum chemical calculations were carried out for the HF molecule near two graphite layers. The results obtained confirm the validity of non-local electrostatic approach beyond the region of Pauli repulsion (in the closest vicinity to the interface). On the other hand, at large distances z, the quantum chemical consideration becomes less reliable owing to the computational restrictions, whereas the electrostatics preserves its capabilities and demonstrates, in particular, the subtle orientation crossover