SIO2-AL2O3 КСЕРОГЕЛІ, ПРИГОТОВАНІ ЗОЛЬ- ГЕЛЬ МЕТОДОМ: СИНТЕЗ ТА ЛЮМІНЕСЦЕНТНІ ВЛАСТИВОСТІ
SiO2-Al2O3 xerogels with various Si : Al ratios were synthesized via sol-gel method (two kinds of synthetic procedures were used) and characterized by means of elemental analysis, XRD, thermogravimetry and IR spectroscopy. No losses of precursors were found during the synthesis and the introduced co...
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| Дата: | 2020 |
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Репозитарії
Ukrainian Chemistry Journal| _version_ | 1871465620082524160 |
|---|---|
| author | Smola, Sergii Fadieiev, Yevhen Rusakova, Nataliia Rusakova, Mariya Efryushina, Ninel |
| author_facet | Smola, Sergii Fadieiev, Yevhen Rusakova, Nataliia Rusakova, Mariya Efryushina, Ninel |
| author_institution_txt_mv | [
{
"author": "Sergii Smola",
"institution": "O.V. Bogatsky Physico-Chemical Institute, National Academy of Sciences of Ukraine; 86 Lyustdorfska doroga, Odesa, 65080, Ukraine"
},
{
"author": "Yevhen Fadieiev",
"institution": "O.V. Bogatsky Physico-Chemical Institute, National Academy of Sciences of Ukraine; 86 Lyustdorfska doroga, Odesa, 65080, Ukraine"
},
{
"author": "Nataliia Rusakova",
"institution": "O.V. Bogatsky Physico-Chemical Institute, National Academy of Sciences of Ukraine; 86 Lyustdorfska doroga, Odesa, 65080, Ukraine"
},
{
"author": "Mariya Rusakova",
"institution": "I.I. Mechnikov Odessa National University; 2 Dvoryanska str., Odesa, 65082, Ukraine"
},
{
"author": "Ninel Efryushina",
"institution": "O.V. Bogatsky Physico-Chemical Institute, National Academy of Sciences of Ukraine; 86 Lyustdorfska doroga, Odesa, 65080, Ukraine"
}
] |
| author_sort | Smola, Sergii |
| baseUrl_str | https://ucj.org.ua/index.php/journal/oai |
| collection | OJS |
| datestamp_date | 2026-07-22T08:23:44Z |
| description | SiO2-Al2O3 xerogels with various Si : Al ratios were synthesized via sol-gel method (two kinds of synthetic procedures were used) and characterized by means of elemental analysis, XRD, thermogravimetry and IR spectroscopy. No losses of precursors were found during the synthesis and the introduced components are quantitatively transferred from the initial mixture to the composition of the formed samples.The position of the luminescence band in the 300–500 nm region depends on the wavelength of the exciting light, time of gel maturation and the drying temperature, which is the manifestation of the influence of the structure of units in xerogels on the luminescent properties. |
| doi_str_mv | 10.33609/2708-129X.86.9.2020.3-13 |
| first_indexed | 2025-09-24T17:43:34Z |
| format | Article |
| fulltext |
3
UDC544.022.822:546.284-31+546.62:54-31+546.05+535.37 doi: 10.33609/2708-129X.86.9.2020.3-13
SOL-GEL PROCESSED SIO2-AL2O3 XEROGELS: SYNTHESIS
AND LUMINESCENT PROPERTIES
S. S. Smola1, Ye. N. Fadieiev1, M. Yu. Rusakova2, N. P. Efryushina1, N. V. Rusakova1*
1 A. V. Bogatsky Physico-Chemical Institute, National Academy of Sciences of Ukraine; 86 Lyust
dorfskaya doroga, Odessa 65080, Ukraine
2I. I. Mechnikov Odessa National University; 2 Dvoryanskaya str., Odessa 65082, Ukraine
*е-mail: natavrusakova@gmail.com
SiO2-Al2O3 xerogels with various Si : Al ratios were synthesized via sol-gel method (two
kinds of synthetic procedures were used) and characterized by means of elemental analysis,
XRD, thermogravimetry and IR spectroscopy. No losses of precursors were found during the
synthesis and the introduced components are quantitatively transferred from the initial mix-
ture to the composition of the formed samples.The position of the luminescence band in the
300–500 nm region depends on the wavelength of the exciting light, time of gel maturation and
the drying temperature, which is the manifestation of the influence of the structure of units in
xerogels on the luminescent properties.
Key words: sol-gel method, silica, alumina, photoluminescence.
INTRODUCTION. Silicon oxide is widely
used in the production of materials by the sol-
gel method. Besides silica one of the most com-
monly used carriers as a basis for the creation
of lasers, optical waveguides, chemical sensors
and molecular thermometers is aluminum
oxide [1–3]. The sol-gel method for the syn-
thesis of materials based on it with controlled
nanoarchitecture and ease of composition ad-
justment has a number of advantages. It is the
ability to control the properties of materials
in the process of their synthesis, including the
specific surface area and porosity, changing the
pH, type of precursor, temperature, solvent.
The resulting materials are characterized by a
specific surface area less than 300 m2/g and a
wide pore size distribution with a maximum in
the range of 2–20 nm. However, it is hard to
obtain alumina hybrid materials with encapsu-
lated organic molecules and metal complexes
by the classical sol-gel method, as a wide num-
ber of the organic components in hybrid ma-
terials begin to break down at a temperature
> 250 °C [4, 5].
Therefore, hybrid materials obtained by a
combination of several inorganic matrices - ox-
ides of silicon, aluminum, titanium, etc. are of-
ten used (“mixed matrices”) [6–9]. Depending
on the mixing sequence of the components,
both microheterogeneous and homogeneous
INORGANIC CHEMISTRY SOL-GEL PROCESSED SIO2-AL2O3 XEROGELS: SYNTHESIS AND LUMINESCENT PROPERTIES
4 ISSN 2708-129X. Укр. хім. журн., 2020
samples can be obtained. The formation of ho-
mogeneous materials is achieved by simultane-
ous mixing of all precursors with the formation
of interpenetrating networks of two or more
inorganic matrices, including the formation of
bonds of the Si-O-Al (Si-O-Ti) type [10–12].
In such systems, phase separation processes do
not occur, but this is quite difficult to achieve
due to the limited solubility of some precur-
sors in the sol-gel process media or due to the
increased tendency of one of the precursors to
premature polycondensation.
In this regard, the aim of this work was, first,
to obtain mixed matrices of silica-alumina, by
hydrolysis of their alkoxides mixed in different
ratios. Second, the investigation of luminescent
properties in relation to their composition and
structure for understanding the possibility of
anchoring luminescent lanthanide complexes
and obtaining highly luminescent lanthanide-
containing hybrid materials
EXPERIMENT AND DISCUSSION OF THE
RESULTS. All reagents and solvents purchased
from commercial suppliers had the analytical-
grade and used without further purification.
Elemental analysis for silicon and alumi-
num content was carried out by atomic ab-
sorption on a Shimadzu A7000 spectrometer
using flame atomization. Samples were fused
in platinum cups with a mixture of tetrabo-
rate-lithium fluoride at 950°C, the fusion prod-
uct was dissolved in a mixture of hydrochloric
and tartaric acids.
IR spectra (4000–400 cm-1) were registered
on a Perkin-Elmer Frontier FTIR spectrometer
in KBr pellets.
X-ray diffraction analysis was performed
on a Supernova diffractometer (Agilent Tech
nologies). Diffraction spectra were obtained
in filtered copper radiation (Cu Kα, anode
voltage 30 kV, current strength 20 mA, ini-
tial slits 2.4 mm, slit on the detector 0.1 mm).
Diffraction patterns were recorded in a dis-
crete mode: scanning step 0.05º, exposure time
at each point 4 s. The range of angles of the dif-
fraction spectra (2θ) was 10-90º.
Thermogravimetric curves (DTA, DTG,
TG) were recorded on a Q-1500D thermo-
gravimetric analyzing system (Paulik-Paulik-
Erdey) in air. Samples weighing about 400 mg
were heated at a rate 5 deg/min in the tempe
rature range 20–600°C, calcinated aluminum
oxide served as a standard.
The luminescence excitation and emis-
sion spectra were recorded on a Fluorolog FL
3–22 spectrofluorimeter, Horiba Jobin Yvon
(Xe lamp 450 W), equipped for measurements
both at room temperature and at 77 K (PMT
R928P for the visible region).
Al2O3 xerogels were obtained by two meth-
ods. The first was the mixing of tetraethox-
ysilane and aluminum isopropoxide in an
ethanol-water-ammonia system. The samples
were kept for 24 hours at room temperature,
dried for two weeks, with a gradual increase
in temperature to 120°C. Materials with a mo-
lar fraction of aluminum from 0 to 20% were
obtained by this method (further increase
in the proportion of aluminum could not be
achieved).
The second approach is based on the use
of liquid aluminum alkoxide (sec-butoxide).
A mixture of silicon and aluminum alkox-
ides in a certain ratio was placed in a desic-
cator containing 25% ammonia solution, and
left for two weeks at T = 20–25°C. As a result
of diffusion of water and ammonia vapors
into the liquid, hydrolysis and polyconden-
sation of alkoxides occur, which is signifi-
cantly slowed down compared to the classi-
UCJ № 9 / Vol. 86S. S. Smola, Ye. N. Fadieiev, M. Yu. Rusakova, N. P. Efryushina, N. V. Rusakova
5https://ucj.org.ua
cal sol-gel process. The samples were dried at
120°C. It is worth noting that with the use of
this approach samples with Al content high-
er than 20% mol can be obtained, but they
are not considered in this work. Samples with
µ(Si) = 100% (or µ(Al) = 0%) and µ(Al) = 100%
were also obtained for comparison from pure
tetraethoxysilane and sec-butoxide aluminum,
respectively.
The concentration of silicon and aluminum
was determined by atomic absorption spec-
troscopy. As can be seen from table 1, the mass
fraction of aluminum is 0–5.4 mass %. The
proportion of silicon decreases from 41.6 to
32.7% with increasing aluminum concentra-
tion. The table also shows the calculated pro-
portions of aluminum and silicon, which are
close to the stoichiometric ratio used during
the synthesis. It can be assumed that during
the synthesis there are no losses of precursors
and the introduced components are quanti-
tatively transferred from the initial mixture
to the composition of the formed samples.
Based on the conditional formula of materials
xSiO2∙yAl2O3∙zH2O, the amount of water was
calculated. An increase in the concentration
of alumina leads to an increase in the amount
of water in the materials from 10.8 to 14.6%,
which is due to its increased affinity for water.
The water content data obtained by elemental
analysis agree well with the thermogravimetry
data.
Table1
Elemental and thermogravimetric analyzes data of xerogels
Calculated Found
Mole fractions
(μ),%
Mole fractions
(μ),%
Mass fractions
(ω), %
Mass fractions
(ω H2O), %
Elemental
analysis*
Thermo
gravimetry
Al Si Al Si Al Si H2O H2O
0,0 100,0 0,0 100,0 0,0 41,6 10,8 11,2
2,5 97,5 2,3 97,7 0,9 39,8 12,2 12,5
5,0 95,0 4,8 95,2 1,8 38,4 12,5 12,7
7,5 92,5 7,2 92,8 2,8 36,9 13,1 13,0
10,0 90,0 9,6 90,4 3,6 35,5 13,5 13,3
12,5 87,5 12,1 87,9 4,5 34,1 14,1 13,7
15,0 85,0 14,6 85,4 5,4 32,7 14,6 14,2
20,0 80,0 19,5 80,5 7,2 43,6 15,5 15,3
*Content of water molecules was calculated from the amount of H, % obtained from the CHN-analyzer.
INORGANIC CHEMISTRY SOL-GEL PROCESSED SIO2-AL2O3 XEROGELS: SYNTHESIS AND LUMINESCENT PROPERTIES
6 ISSN 2708-129X. Укр. хім. журн., 2020
Fig.1. XRD patterns of xerogels synthesized
from tetraethoxysilane and aluminum isopropox-
ide at various ratios
XRD patterns of the materials (Fig. 1) in-
dicate that the samples are X-ray amorphous
in the range 10° ≤ 2θ ≤ 90°. All diffraction
patterns exhibit broadened signals at 22–25°,
which are characteristic of amorphous silicon
dioxide. It is known that halo-like reflections
can be caused by both amorphous and nano-
crystalline states of the samples [14]. The dif-
fraction spectrum of the nanocrystalline state
is a superposition of broad reflections from
all possible crystallographic planes. The half-
width of such scattering crystallites depends on
their size according to the Selyakov – Scherrer
formula [15]. However, diffraction patterns
of materials with different concentrations of
aluminum are characterized by the same half-
width of the band at 2θ ≈ 23°. Consequently,
the diffraction patterns of the samples indicate
their amorphousness. In accordance with the
literature data [16, 17] for amorphous pow-
ders, the position of the first signal in the dif-
fractogram corresponds to the distance be-
tween structural units (d) in accordance with
Bragg’s law (2dsinθ = nλ). Based on the θ val-
ues obtained, this distance is approximately
4.30 Å, which is close to the value obtained for
pure (undoped) silicon dioxide (4.20 Å), and
probably corresponds to the distance between
SiO4tetrahedra.
For comparison, the figure also shows an
XRD pattern of a sample obtained by hydrol-
ysis of pure aluminum isopropoxide. The po-
sition of the reflections at 2θ ≈ 13, 28, 38, 49,
65, 71° corresponds to the diffractogram of
boehmite (γ-AlOOH) obtained by the sol-
gel method earlier[18]. None of these reflec-
tions are observed in samples based on mixed
matrices, which indicates the absence of the
formation of a boehmite phase in mixed
systems.
In the IR spectrum of silicon dioxide ob-
tained by the method used for mixed xe-
rogels the following bands are present (Fig. 2).
Deformation vibrations of the O-Si-O and
Si-O-Si bonds appear as signals at 468 and
799 cm-1, respectively. Symmetric and asym-
metric vibrations of Si-O-Si bonds are at 970
and 1088 cm-1. In addition, the hydroxyl groups
UCJ № 9 / Vol. 86S. S. Smola, Ye. N. Fadieiev, M. Yu. Rusakova, N. P. Efryushina, N. V. Rusakova
7https://ucj.org.ua
remaining in the silica gel structure, which have
not been dehydrated for steric reasons, result
in a band at 1639 cm-1 (Si-OH plane-strain vi-
brations) and a broad band at 3459 cm-1 (valent
O-H vibrations).With increasing Al2O3 content
the maximum of the 400–500 cm-1 band shifts
to higher energies and the relative intensity de-
crease, which is typical for such systems [19].
In the sample with µ(Al) = 100 % this band is
located at 478.5 cm-1 and the peak at 611 nm
appears.
Fig. 2. IR spectra of xerogels derived from tetra-
ethoxysilane and aluminum isopropoxide in differ-
ent ratios
Thermal decomposition of silica-alumina
materials (Fig. 3) is similar to pure silicon ox-
ide obtained by the sol-gel method. The pre-
dominant process responsible for weight loss
is dehydration. For the obtained materials, the
separation of water molecules was observed
in two stages: in the temperature range of
50–120°C (about 8–12%) and 120–600°C. It is
known that there are two types of adsorbed
water on the surface of silica, the first one is
desorbed at 25–105 °C, and the second one -
at 105–180 °C [20]. The first type is physically
adsorbed water while the second is water mol-
ecules bound by hydrogen bonds.
Fig. 3. Thermogravimetric analysis curves of xe-
rogel with μ(Al) = 15%
According to [21], in order to remove the
physically adsorbed water molecules activa-
tion energy of 6.6–8.2 kcal/mol is required,
while the removal of the second type of wa-
ter requires 10 kcal/mol. As a rule, the initial
concentration of silanol groups on the surface
of silica is 5 OH groups/nm2 at 150 °C. OH-
groups/nm2 of silanol begin to condense and
then they are largely removed in the form of
water only above 170 °C. At 400 °C, about half
of the hydroxyl groups of the surface are re-
moved. Above 400–450 °C, most of them have
already been removed from the surface and
extensive siloxane areas appear, which can no
longer adsorb water, and at 750 °C only sin-
gle Si-OH free groups with a concentration
of about 1.3 groups/nm2 are present on the
surface [22].
INORGANIC CHEMISTRY SOL-GEL PROCESSED SIO2-AL2O3 XEROGELS: SYNTHESIS AND LUMINESCENT PROPERTIES
8 ISSN 2708-129X. Укр. хім. журн., 2020
a b
Fig. 4. Excitation (a) and luminescence (b) spectra of xerogels with different Si/Al ratios in comparison
with pure alumina
Fig. 4 shows the excitation and lumines-
cence spectra of the obtained xerogels, as well
as pure aluminum hydroxide obtained by hy-
drolysis of aluminum isopropoxyl and pure
silicon oxide obtained by hydrolysis of tetrae-
thoxysilane.
In samples obtained by the sol-gel method
from silicon alkoxides, an emission band in the
region of 300–500 nm is often observed. Its na-
ture was studied in most detail in [23–25], where
the authors analyzed a large number of differ-
ent processes, including “oxygen excess-related
defects” or “oxygen deficiency-related defects”.
However, in this study at least three different
bands were observed in the range of 250–750
nm, while for amorphous silicon dioxide ob-
tained by the sol-gel method, as a rule, one band
is characteristic. The most intense fluorescence
is observed in samples containing amino groups
and amide fragments. The nature of this band
has been studied by fluorescence, UV, visible,
and IR spectroscopy, small-angle X-ray scatter-
ing spectroscopy and 13C and 29Si NMR in liter-
ature and may be caused by oxygen defects of
the •O-O-Si (≡O2C) type arising in silica nano-
domains [26-29]. Among other reasons causing
it, the processes of charge transfer Si-O [30, 31],
carbon, nitrogen and oxygen-containing impu-
rities and accompanying defects [32, 33] are also
indicated.
UCJ № 9 / Vol. 86S. S. Smola, Ye. N. Fadieiev, M. Yu. Rusakova, N. P. Efryushina, N. V. Rusakova
9https://ucj.org.ua
The position of the emission band in the
luminescence spectra of xerogels depends
on the wavelength of the exciting light. For
example, in the case of pure (undoped) sili-
ca gel obtained with the same technique with
increasing of the excitation wavelength, a ba-
thochromic shift of the maxima is observed in
both fluorescence and phosphorescence spec-
tra (Fig. 5).
Fig. 5. Fluorescence (top) and phosphorescence
(bottom) spectra of xerogel with μ(Al) = 15% at dif-
ferent excitation wavelengths (280 nm (1), 300 nm
(2), 330 nm (3), 370 nm (4), 395 nm (5))
This phenomenon is explained in [33] as
follows. The resulting nanoclusters and do-
mains have different sizes. High energy light
quanta excite primarily domains with minimal
sizes. Their subsequent relaxation through the
electron-hole recombination mechanism leads
to the emission of shorter-wavelength light.
As the energy decreases, larger and larger do-
mains are excited and emission is observed in
the longer wavelength (visible) region. This
can be confirmed by the red shift of the fluo-
rescence maximum depending on the time of
gel maturation, as well as the drying tempera-
ture (Fig. 6). Silica gel that has been dried at a
higher temperature appears to emit in a longer
wavelength range of the spectrum, since it is
composed of larger nanoclusters.
Fig. 6. Plot of the fluorescence maxima vs tem-
perature of drying of xerogelwith μ(Al) = 15%
The luminescence decay studies of ob-
tained xerogels were also performed. It was
found that luminescence decay of the pure
silica gel is characterized by two-exponen-
tial function revealing two emitting states
with lifetimes 5.7 and 17.7 ns. The addition of
5% aluminum led to a decrease of lifetimes -
3.8 ns and 11.0 ns. A further increase in the
INORGANIC CHEMISTRY SOL-GEL PROCESSED SIO2-AL2O3 XEROGELS: SYNTHESIS AND LUMINESCENT PROPERTIES
10 ISSN 2708-129X. Укр. хім. журн., 2020
aluminum concentration did not lead to a
change in the decay kinetics up to 20% of
alumina. It can be assumed that the appear-
ance of aluminum atoms in the material ma-
trix does not lead to the appearance of a new
type of emitting centers, but affects the pop-
ulation of the already existing excited states.
This fact may be caused by an increase of OH-
oscillators due to higher water content as well
as changes of the matrix polarizability, but it
requires further studying.
Authors are grateful to the National
Academy of Sciences of Ukraine for the finan-
cial support of this work.
CONCLUSIONS. In this work we investi-
gated the synthetic conditions for obtaining
SiO2-Al2O3 materials with various Si : Al ra-
tios via sol-gel method. Samples were charac-
terized by means of elemental analysis, XRD,
thermogravimetry and IR spectroscopy. It can
be assumed that the introduced reagents are
quantitatively transferred from the initial mix-
ture to the composition of the formed samples.
Fluorescence spectra of samples were analyz-
ed. All samples shows fluorescence in the 300–
500 nm region. The position of the emission
band in the luminescence spectra depends on
the wavelength of the exciting light, time of gel
maturation and the drying temperature, which
is the manifestation of the influence of the
structure of units in xerogels on the lumines-
cent properties. It can be concluded that SiO2-
Al2O3 mixed matrix can serve as the inorgan-
ic host for luminescent lanthanide complexes
which is the further development of this work.
SIO2-AL2O3 КСЕРОГЕЛІ, ПРИГОТОВАНІ ЗОЛЬ-
ГЕЛЬ МЕТОДОМ: СИНТЕЗ ТА ЛЮМІНЕСЦЕНТНІ
ВЛАСТИВОСТІ
С. С. Смола1, Є. М. Фадєєв1,
М. Ю. Русакова2, Н. П. Єфрюшина1,
Н. В. Русакова1
1Фізико-хімічний інститут ім. О. В. Бо
гатського НАН України, Люстдорфська до-
рога, 86, Одеса 65080, Україна
2Одеський національний університет
ім. І. І. Мечникова, Дворянська, 2, Одеса
65082, Україна
*е-mail: natavrusakova@gmail.com
Ксерогелі SiO2-Al2O3 з різними співвід-
ношеннями Si : Al були синтезовані золь-
гель методом (використовували два види
синтетичних процедур) та охарактеризува-
ли за допомогою елементного аналізу, рент-
генофазового аналізу, термогравіметрії та
ІЧ-спектроскопії. Під час синтезу втрат
прекурсорів не виявлено, а введені ком-
поненти кількісно переносяться від вихід-
ної суміші до складу сформованих зразків.
Положення смуги люмінесценції в області
300–500 нм залежить від довжини хвилі
збуджуючого світла, часу дозрівання гелю
та температури висихання, що є проявом
впливу структурних одиниць у ксерогелях
на люмінесцентні властивості.
Ключові слова: золь-гель метод, діоксид
кремнію, оксид алюмінію, фотолюмінес-
ценція.
UCJ № 9 / Vol. 86S. S. Smola, Ye. N. Fadieiev, M. Yu. Rusakova, N. P. Efryushina, N. V. Rusakova
11https://ucj.org.ua
SIO2-AL2O3 КСЕРОГЕЛИ, ПРИГОТОВЛЕННЫЕ
ЗОЛЬ-ГЕЛЬ МЕТОДОМ: СИНТЕЗ
И ЛЮМИНЕСЦЕНТНЫЕ СВОЙСТВА
С. С. Смола1, Е. Н. Фадеев1,
М. Ю. Русакова2, Н. П. Ефрюшина,
Н. В. Русакова1
1Физико-химический институт им.
А. В. Богатского НАН Украины, Люст
дорфская дорога, 86, Одесса 65080, Украина
2Одесский национальный университет
им. И. И. Мечникова, Дворянская, 2,Одесса
65082, Украина
*е-mail: natavrusakova@gmail.com
Ксерогели SiO2-Al2O3 с различным соот-
ношением Si: Al были синтезированы зо-
ль-гель методом (использовались два вида
синтетических процедур) и охарактери-
зованы с помощью элементного анализа,
рентгенофазового анализа, термогравимет
рии и ИК-спектроскопии. Во время синтеза
потерь прекурсоров не обнаружено, а вве-
денные компоненты количественно пере-
носятся из исходной смеси в состав сфор-
мированных образцов. Положение полосы
люминесценции в области 300–500 нм за-
висит от длины волны возбуждающего све-
та, времени созревания геля и температу-
ры высыхания, что является проявлением
влияния структурных единиц ксерогеля на
люминесцентные свойства.
Ключевые слова: золь-гель метод, диок-
сид кремния, оксид алюминия, фотолюми-
несценция.
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Стаття надійшла 10.09.2020
|
| id | oai:ojs2.1444248.nisspano.web.hosting-test.net:article-230 |
| institution | Ukrainian Chemistry Journal |
| keywords_txt_mv | keywords |
| language | English |
| last_indexed | 2026-07-23T01:04:55Z |
| publishDate | 2020 |
| publisher | V.I.Vernadsky Institute of General and Inorganic Chemistry |
| record_format | ojs |
| resource_txt_mv | ucjorgua/c7/c1019c4ade0d946049f6a7694f8d57c7.pdf |
| spelling | oai:ojs2.1444248.nisspano.web.hosting-test.net:article-2302026-07-22T08:23:44Z SOL-GEL PROCESSED SIO2-AL2O3 XEROGELS: SYNTHESIS AND LUMINESCENT PROPERTIES SIO2-AL2O3 КСЕРОГЕЛИ, ПРИГОТОВЛЕННЫЕ ЗОЛЬ-ГЕЛЬ МЕТОДОМ: СИНТЕЗ И ЛЮМИНЕСЦЕНТНЫЕ СВОЙСТВА SIO2-AL2O3 КСЕРОГЕЛІ, ПРИГОТОВАНІ ЗОЛЬ- ГЕЛЬ МЕТОДОМ: СИНТЕЗ ТА ЛЮМІНЕСЦЕНТНІ ВЛАСТИВОСТІ Smola, Sergii Fadieiev, Yevhen Rusakova, Nataliia Rusakova, Mariya Efryushina, Ninel sol-gel method, silica, alumina, photoluminescence. SiO2-Al2O3 xerogels with various Si : Al ratios were synthesized via sol-gel method (two kinds of synthetic procedures were used) and characterized by means of elemental analysis, XRD, thermogravimetry and IR spectroscopy. No losses of precursors were found during the synthesis and the introduced components are quantitatively transferred from the initial mixture to the composition of the formed samples.The position of the luminescence band in the 300–500 nm region depends on the wavelength of the exciting light, time of gel maturation and the drying temperature, which is the manifestation of the influence of the structure of units in xerogels on the luminescent properties. V.I.Vernadsky Institute of General and Inorganic Chemistry 2020-10-20 Article Article Inorganic Chemistry Неорганическая химия Неорганічна хімія application/pdf https://ucj.org.ua/index.php/journal/article/view/230 10.33609/2708-129X.86.9.2020.3-13 Ukrainian Chemistry Journal; Vol. 86 No. 9 (2020): Ukrainian Chemistry Journal; 3-13 Украинский химический журнал; ##issue.vol## 86 ##issue.no## 9 (2020): Украинский химический журнал; 3-13 Український хімічний журнал; Том 86 № 9 (2020): Український хімічний журнал; 3-13 2708-129X 2708-1281 en https://ucj.org.ua/index.php/journal/article/view/230/124 Copyright (c) 2020 Sergii Smola, Yevhen Fadieiev, Nataliia Rusakova, Mariya Rusakova, Ninel Efryushina https://creativecommons.org/licenses/by-nc/4.0 |
| spellingShingle | Smola, Sergii Fadieiev, Yevhen Rusakova, Nataliia Rusakova, Mariya Efryushina, Ninel SIO2-AL2O3 КСЕРОГЕЛІ, ПРИГОТОВАНІ ЗОЛЬ- ГЕЛЬ МЕТОДОМ: СИНТЕЗ ТА ЛЮМІНЕСЦЕНТНІ ВЛАСТИВОСТІ |
| title | SIO2-AL2O3 КСЕРОГЕЛІ, ПРИГОТОВАНІ ЗОЛЬ- ГЕЛЬ МЕТОДОМ: СИНТЕЗ ТА ЛЮМІНЕСЦЕНТНІ ВЛАСТИВОСТІ |
| title_alt | SOL-GEL PROCESSED SIO2-AL2O3 XEROGELS: SYNTHESIS AND LUMINESCENT PROPERTIES SIO2-AL2O3 КСЕРОГЕЛИ, ПРИГОТОВЛЕННЫЕ ЗОЛЬ-ГЕЛЬ МЕТОДОМ: СИНТЕЗ И ЛЮМИНЕСЦЕНТНЫЕ СВОЙСТВА |
| title_full | SIO2-AL2O3 КСЕРОГЕЛІ, ПРИГОТОВАНІ ЗОЛЬ- ГЕЛЬ МЕТОДОМ: СИНТЕЗ ТА ЛЮМІНЕСЦЕНТНІ ВЛАСТИВОСТІ |
| title_fullStr | SIO2-AL2O3 КСЕРОГЕЛІ, ПРИГОТОВАНІ ЗОЛЬ- ГЕЛЬ МЕТОДОМ: СИНТЕЗ ТА ЛЮМІНЕСЦЕНТНІ ВЛАСТИВОСТІ |
| title_full_unstemmed | SIO2-AL2O3 КСЕРОГЕЛІ, ПРИГОТОВАНІ ЗОЛЬ- ГЕЛЬ МЕТОДОМ: СИНТЕЗ ТА ЛЮМІНЕСЦЕНТНІ ВЛАСТИВОСТІ |
| title_short | SIO2-AL2O3 КСЕРОГЕЛІ, ПРИГОТОВАНІ ЗОЛЬ- ГЕЛЬ МЕТОДОМ: СИНТЕЗ ТА ЛЮМІНЕСЦЕНТНІ ВЛАСТИВОСТІ |
| title_sort | sio2-al2o3 ксерогелі, приготовані золь- гель методом: синтез та люмінесцентні властивості |
| topic_facet | sol-gel method silica alumina photoluminescence. |
| url | https://ucj.org.ua/index.php/journal/article/view/230 |
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