Ruslan Smyslov

• Ph.D.
• Senior Researcher at Institute of Macromolecular Compounds, Russian Academy of Sciences

The present paper is devoted to the investigation of the formation process and growth of Gd2Ti2O7 nanocrystals with a pyrochlore structure doped with Sm3+ and Nd3+ ions. During the Gd2Ti2O7:Sm3+/Nd3+ nanoparticles synthesis, aqueous solutions of gadolinium, samarium and neodymium nitrates were added to a mixture of titanium isopropoxide, and polyet...

New composite hydrogels (CH) based on bacterial cellulose (BC) and poly-1-vinyl-1,2,4-triazole (PVT) doped with orthophosphoric acid (oPA), presenting interpenetrating polymeric networks (IPN), have been synthesized. The mesoscopic study of the supramolecular structure (SMS) of both native cellulose, produced by the strain Komagataeibacter rhaeticu...

Functional copolymers of 1-vinyl-1,2,4-triazole (VT) and N-vinylcarbazole (VK) were synthesized using a free-radical polymerization. The content of hole-conducting N-vinylcarbazole units was found to be 9, 16, and 37 mol. %. Fourier transform infrared spectroscopy, ¹H-NMR spectroscopy, gel permeation chromatography, thermogravimetric analysis, and...

A series of multiblock polyurethane-ureas (PUU) based on polycaprolactone diol (PCL) with a molecular mass of 530 or 2000 g/mol, as well as hard segments of different lengths and structures, were synthesized by the step-growth polymerization method. The chemical structure of the synthesized multiblock copolymers was confirmed by IR- and NMR-spectro...

Novel composite hydrogels representing interpenetrating polymeric networks (IPN) have been synthesized and consisted of Gluconacetobacter xylinus cellulose (GxC) and poly-1-vinyl-1,2,4-triazole (PVT) with Cu²⁺. The composite hydrogels’ mesostructure has been studied from 1.6 nm to 2.5 μm by small-angle and ultra-small-angle neutron scattering metho...

Cobalt ferrite nanoparticles were synthesized both in hydro and in solvothermal conditions from Co and Fe salts of different chemical nature (nitrates and chlorides) taken in a 1:2 cation ratio. Varying the chemical prehistory, synthesis temperature, isothermal holding time, and the reaction medium composition made it possible to obtain a set of Co...

Several new 2,8‐diphenylpyrido[3,2‐g]quinoline‐4,6‐dicarbohydrazides were synthesized and copolyhydrazides based on them were obtained. Molecular weight, thermal, stress–strain and optical properties were investigated. It was shown that all polymer films exhibit significant luminescence in the 450–650 nm region, the profile and intensity of which d...

The scale of magnetic correlations in materials based on reduced graphene oxide (RGO) has been estimated for the first time using the method of small-angle scattering of polarized neutrons. This information cannot be obtained by other methods. Experiments have demonstrated the presence of small-angle magnetic-nuclear interference scattering for bot...

This work presents our study results of the magnetization of multilayer UV-reduced graphene oxide (UV-rGO), polymer matrix (polystyrene), and a conjugated composite based on them. The mesoscopic structure of the composites synthesized in this work was studied by such methods as X-ray diffraction, SEM, as well as NMR-, IR- and Raman spectroscopy. Th...

The use of reduced graphene oxide (r-GO) is a promising way of fabricating organic–inorganic composites with unique electrical and magnetic properties. In our work, polystyrene/r-GO composites were synthesized, in which both the components are linked together by covalent bonds. The r-GO used differs from the graphene obtained from graphite through...

The mesostructure of segmented poly(urethane imide) containing 4–10 wt % CoFe2O4 or Al3Fe5O12 nanoparticles was experimentally studied by small-angle polarized neutron scattering, which can analyze the nuclear and magnetic subsystems of the obtained composites. The transformation of the domain structure of the magnetic elastomers based on poly(uret...

New copolyfluorenes containing 4,7-di-2-thienyl-2,1,3-benzothiadiazole and 2,1,3-benzothiadiazole or derivatives of naphthalimide as luminophores were synthesized under microwave heating. Charge-transporting carbazole, triphenylamine, or diphenyloxadiazole groups were introduced into the side chains of polymers through 9,9-bis-(4-phenoxy)-2,7-fluor...

Quasi-spherical nanoparticles of ZrO 2 containing EuO 1.5 from 2 to 15 mol.% were synthesized from the chlorides of the corresponding metals under hydrothermal conditions. The structural changes of Zr 1-x Eu x O 2-0.5x (x = 0.02 ÷ 0.15) nanoparticles depending on the content of europium (III) ions were studied using the complementary methods (X-ray...

The interaction of silver nitrate with star-shaped poly(2-ethyl-2-oxazoline) and poly(2-isopropyl-2-oxazoline) containing central thiacalix[4]arene cores, which proceeds under visible light in aqueous solutions at ambient temperature, was studied. It was found that this process led to the formation of stable colloidal solutions of silver nanopartic...

Crystalline phosphors of Eu3+-doped titania (TiO2:Eu3+) were prepared by hydro and solvothermal synthesis with luminescent ion concentration of 2 mol.%. The structure and shape of the synthesized nanoparticles were characterized using X-ray powder diffraction, transmission electron microscopy, and Raman spectroscopy. Changes in the emission, excita...

A number of new substituted pyrido-[3,2-g]quinoline-3,7-diamines are synthesized, and copolyamides containing main-chain anthrazoline groups based on them are obtained. The mechanical, thermal, molecular-mass, and luminescent characteristics are investigated. All polymers have high mechanical properties and heat resistance. It is shown that the ant...

ZrO 2 nanoparticles doped with 2 mol.% of EuO 1.5 were obtained from solutions of inorganic salts, zirconium alkoxide and chelating compounds under hydro and solvothermal conditions. The phase compositions of the synthesized nanophosphors were determined using the methods of X-ray diffraction, photoluminescence and Raman spectroscopy. The changes i...

Temperature-responsive star-shaped poly(2-ethyl-2-oxazoline) (star-PETOX) and poly(2-isopropyl-2-oxazoline) (star-PIPOX) with arms grafted to the lower rim of thiacalix[4]arene were studied in solutions by viscometry, sedimentation velocity, light scattering, and small-angle neutron scattering. The experiments were carried out in water and tetrahyd...

A number of copolyamides containing main-chain phenanthroline groups and their metal-polymer complexes with iridium and europium are synthesized. All the obtained polymers possess high mechanical properties and thermal stability. The synthesized europium complexes display an intense luminescence in the range of 610–620 nm.

The synthesis of copolyfluorenes by the Suzuki method under microwave heating carried out under conditions that were previously used for convection heating in an open system is studied. Using size-exclusion liquid chromatography, the stages of polycondensation, namely, oligomer formation, chain growth, and end group termination, are examined. The i...

The study of the lanthanide ion luminescence as a function of their environment in polymer-inorganic composites is necessary for better understanding of the electron energy transfer processes in a condensed state. From a practical point of view, these materials are promising for optics and medicine. The nanoparticles of ZrO2-LnO1.5 (Ln = Eu, Tb) so...

This review summarizes published data concerning modern physicochemical methods used to study complexation processes of polymers in solutions. Some of them—dynamic light scattering, nanoparticle tracking analysis, transmission electron microscopy, cryotransmission electron microscopy, atomic force microscopy, small-angle neutron scattering, analyti...

This chapter focuses on studies of structural and dynamical characteristics of thermosensitive polymers by polarized luminescence (PL) while changing temperature of solutions. It also focuses on the nanosecond dynamics, that is, on the study of the mobility of polymer chain segments, observed in the nanosecond range of the relaxation time spectrum,...

Spherical nanoparticles of ZrO2 with 2 and 10 mol% EuO1.5 up to 20 nm size were prepared by the method of hydrothermal synthesis for luminescent functionalization of the polymer–inorganic nanocomposites based on poly(methyl methacrylate). Surface modification of oxide nanoparticles was carried out by 3‐(trimethoxysilyl)propyl methacrylate, dimethox...

A series of anthrazoline-containing monomers are synthesized, and eight co-polyamides of different chemical structures, containing 1,9-anthrazoline fragments in the main chain, are obtained and investigated. Photoluminescent, stress–strain, and thermal properties of these polymers are studied. It is shown that polymers with fragments of 4,4′-(pyrid...

Polyfluorene copolymers containing 33 mol% of 2,5-difluoro-1,4-phenylene units and other comonomers comprising chargetransporting triphenylamine, carbazole, and 1,8-naphthalimide groups were synthesized by the Suzuki polycondensation under microwave irradiation. On heating the obtained copolymers to 180 °C, their photoluminescence spectra remain st...

In this study, the molecular design of synthesized polymeric polyphenylquinoline (PPQ) structures is associated with the varying chemical nature of the bridging group (X) between the phenylquinoline cycles and the heteroarylene radicals (Ar) in the repeating unit of PPQs. The photophysical study of optical, photosensitive, and luminescent propertie...

Seven polyfluorenes containing new carbazole derivatives of Nile Red dye and 1,8-naphthalimide in the chain (obtained by the Suzuki and Yamamoto coupling) are characterized by the Nile Red emission band being less intense in their electroluminescence spectra than in photoluminescence spectra. In the optimal composition, 0.15 mol% fraction of Nile R...

Scanning electron microscopy, ultra-small-angle neutron scattering (USANS), small-angle neutron and X-ray scattering (SANS and SAXS), as well as low-temperature nitrogen adsorption, were used in the studies of micro- and mesostructure of polymer matrix prepared from air-dry preliminarily disintegrated cellulose nano-gel film (synthesized by Glucona...

Submicron- and micron-scale structures of composite hydrogels based on bacterial cellulose (BC) and polyacrylamide were studied by spin-echo small-angle neutron scattering (SESANS) and cryo-scanning electron microscopy (cryo-SEM). These hydrogels possessing the structure of interpenetrating polymer network were synthesized via free-radical polymeri...

Novel polymer macroligands—copolyamides containing different quantity of bipyridyl groups—were obtained from 4,4′-diamino-2,2′-bipyridine, 4,4′-diaminodiphenyl ether and terephthaloyl-bis(3-methoxy-4-hydroxybenzoic) acid dichloroanhydride by low-temperature polycondensation. Metal–polymer complexes with different content of Ir(ppy)2 were obtained b...

The submicron- and micron-scale structures of composite hydrogels based on bacterial cellulose (BC) and polyacrylamide were studied by spin-echo small-angle neutron scattering (SESANS). These hydrogels were synthesized via free-radical polymerization of acrylamide carried out in pellicle of BC swollen in the reaction solution. No neutron scattering...

Biocompatible composite hydrogels based on polyacrylamide and reinforced with bacterial or vegetable cellulose were synthesized. In the mechanical characteristics and water content, these hydrogels are similar to knee joint cartilages with average rigidity level. The structure and chemical composition of the hydrogels after their residence for 45 d...

The dimensional effect previously observed in various matrices for 2,6-polyphenylquinoline containing oxygen bridge and carbazolediyl groups is confirmed for phenylamine-containing 2,6-polyphenylquinolines with carbazole- and indolocarbazolediyl moieties in a polymethyl methacrylate matrix. The effect is observed from the dependence of the luminesc...

Nanoparticles in the ZrO2-Me2O3 system (where Me = Y, Eu, Tb, Sm, Er) with different phase composition (m-ZrO2, t-ZrO2, c-ZrO2), size (5÷25 nm) and morphology (spheres, hollow spheres, rods and star structure) were obtained by hydrothermal synthesis. Photocatalytic activity was measured for the reaction of photoinduced hydrogen evolution from aqueo...

Tissue reactions to the grafting of samples of composite hydrogel based on polyacrylamide and cellulose of different origin (plant and bacterial) were studied in 48 laboratory outbred rats and 24 rabbits of chinchilla breed. The observations were carried out on Days 5, 14, 45 and 90 after placement of implants in the muscle, joint cavity, deep defe...

Spectral, luminescent and electro-optical properties of poly(9,9-dioctylfluorene), containing small quantity (1–2 mol%) of 2,1,3-benzothiadiazole comonomer units, obtained by means of either Suzuki or Yamamoto polycondensation reactions were studied and compared. The difference of luminescent properties of the two copolymers with nearly identical c...

Abstract—Structural and dynamic characteristics of a star-shaped polymer with a central tert-butyl- calix[8]arene core and poly(N-isobutyryl ethylenimine)-ω-piperazine arms in aqueous solutions were studied via the polarized luminescence method. To conduct investigations, a luminescent label of the anthracene structure was attached to the polymer....

The effect of physical factors on the resistance of thin fi lms of nonconjugated polymers was studied. The resistance of polymer fi lms with the metal type of conductivity decreases with an increase in the amount of interchain hydrogen bonds and of metal nanoparticles in the polymer matrix, and also in the presence of a plasticizing additive. Intro...

New copolyfluorenes containing units of 4,7-dibromo-2,1,3-benzothiadiazole (green luminophore) and 3,6- or 2,7-dibromocarbazole derivatives with side-chain fragments of green (4-pyrrolidinyl-1,8-naphthalimide) and red (Nile red) luminophores and additional carbazole or diphenyloxadiazole groups are synthesized via the Suzuki copolycondensation reac...

A procedure was suggested for preparing cellulose polymorph IV by dissolution of native celluloses from evolutionarily different sources in trifluoroacetic acid to molecularly dispersed state, followed by regeneration and treatment under hydrothermal conditions.

The photophysical and electrical properties of copolymers based on 2,6-polyphenylquinolines containing a bridging oxygen or phenylamine group between quinoline rings and octyl- or dodecylcarbazole or dioctylindolo[3,2-b]carbazole fragments in the aromatic radical are studied. It is shown that the introduction of carbazole and indolo[3,2-b]carbazole...

An increase in the optical transmission in electronic spectra for metal/poly(1,10-decamethylene-acetamidine) systems after UV irradiation is observed, in contrast to polymer and metal films investigated separately where there was no such effect. The increase is explained by changes in the distribution of the electric charge induced by UV irradiatio...

The energy structure and nature of intramolecular charge transfer have been determined for a series of synthesized 2,6�polyphenylquinolines (PPQs) containing resorcinol, oxygen, and phenylamine bridging groups between phenylquinoline cycles and possessing an arylene radical in the form of alkylated derivatives of carbazole or indolo[3,2�b]carbazole...

A novel monomer, viz., bipyridyl-containing dicarboxylic acid, was synthesized from 6-pyridyl-3,4-pyridine dicarboxylic acid anhydride and 5-aminoisophthalic acid. Novel polymer macroligands, viz., copolyamides containing 5, 15, 30, and 45% of the bipyridyl side groups, were obtained based on this monomer by low-temperature polycondensation. Metal...

The structural-morphological parameters of hybrid nanosystems, which are promising as photosensitizers (PS) for photodynamic therapy (PDT), are comparatively studied by atomic force microscopy (AFM), ultraviolet (UV) spectroscopy, photoluminescence (PL) and dynamic light scattering. The nanosystems are nanoparticles of zinc selenide (ZnSe) prepared...

The photoluminescence properties of Tb3+ and Eu3+ complexes with polymer ligands containing various kinds of complexing groups—namely, carboxyl (5–20 mol %), pyridylquinoline (5 mol %), or pyridylnaphthyl (5 and 10 mol %) groups—in solution and block are considered. The chemical structure of a neutral comonomer (methyl methacrylate; styrene; isopro...

For the synthesis of monodisperse submicron particles (in which a luminophore is covalently bound to the polymer matrix), methods of emulsifier-free emulsion and seeded copolymerizations are applied to introduce the luminophore-containing monomer into the bulk or shell of the particles, respectively. Scanning electron microscopy and optical spectro...

The photophysical properties of poly-2,2 Prime -(1-dodecyl carbazole-4,7-yl)-6,6 Prime -(oxy)-bis-(4-phenylquinoline) in a solution, as a film, and in a poly(methyl methacrylate) or poly-N-vinylcarbazole host matrix have been studied. Considerable positive solvatochromism in the photoluminescence spectra, compared with solvatochromism in the absorp...

Photophysical and electrical properties of new synthesized 2,6-polyphenylquinolines (PPQs) containing an oxygen or phenylamine bridging group between quinoline cycles and, as an arylene radical, alkylated derivatives of carbazole or indolo[3,2-b]carbazole are studied. It is shown that the photosensitivity for new PPQs is 10{sup 4}-10{sup 5} cm{sup...

New metal–polymer complexes have been synthesized that combine Eu(iii) with a copolymer of N-vinylcarbazole and a methacrylate comonomer-ligand that contains chelate 2-(2-pyridyl)-quinoline groups. The photo- and electroluminescence properties of these metal–polymer complexes, containing from 0.6 to 5 mol% europium (in terms of a link of the copoly...

Copolymers of N-vinylcarbazole and N-vinylamides are synthesized by free-radical copolymerization. It is shown that the copolymers of N-vinylpyrrolidone and N-vinylcaprolactam containing 12–21 mol % N-vinylcarbazole units, when dispersed in a poly(methyl methacrylate) matrix, enhance the intensity of luminescence of terbium ions by two orders of ma...

Soluble aromatic polyimides and copolyimides are synthesized on the basis of 4,4′-diaminotriphenylamine and oxadiazole-containing diamines. Poly(ester oxadiazoles) are prepared from acid dichlorides or oxadiazole-containing acid dihydrazides. The optical, electrochemical, and thermal properties of the polymers are investigated. It is shown that oxa...

Copolymers of N-vinylcarbazole and methyl methacrylate carrying side pyridylquinoline groups are synthesized on the basis of the methacrylol derivative of 2-pyridylquinoline-4-carboxylic acid hydrazide. It is shown that the copolymers form stable metal-polymer complexes with Ir(ppy)2Cl (ppy = 2-phenylpyridine). The spectral and photoluminescent pro...

Successive molecular assembling in polymer chains furnished a series of the comb-shaped copolymers of 4-aminostyrene containing side styrylquinoline chromophore groups. Thermal, thermomechanical, spectroscopic, and luminescent properties of the polymers and low-molecular-weight model chromophores were studied. Key wordscopolymers–reactions in chai...

Poly(amido acids) with main-chain metal-binding ligands methylene-bis(anthranilic acid) and their linking fragments of a widely varied structure have been synthesized. The chemical structure of poly(amido acids) that affect the luminescence of Tb3+ and Eu3+ ions and interact with them is studied, and the mechanism of this effect is advanced.

Composites based on two biocompatible compounds, namely, inorganic hydrated calcium phosphates and organic microfibrillar ribbons of cellulose Acetobacter xylinum, are prepared by aggregation in an aqueous suspension. The influence of the structural organization of the hydroxyapatite and temperature-time conditions on the formation of the composite...

Composites based on two biocompatible compounds, namely, inorganic hydrated calcium phosphates and organic microfibrillar ribbons of cellulose Acetobacter xylinum, are prepared by aggregation in an aqueous suspension. The influence of the structural organization of the hydroxyapatite and temperature-time conditions on the formation of the composite...

The nanoscale structural features in a composite (gel film of Acetobacter Xylinum cellulose with adsorbed silver nanoparticles, stabilized by N-polyvinylpyrrolidone) have been investigated by small-angle X-ray scattering. The size distributions of inhomogeneities in the porous structure of the cellulose matrix and the size distributions of silver n...

It was shown that Acetobacter xylinum cellulose gel-films can sorb silver and selenium nanoparticles stabilized by N-poly(vinyl-2-pirrolidone). The structure of original cellulose matrix, isolated nanoparticles and cellulose with sorbed nanoparticles was characterized by electron diffraction, electron microscopy, small- and wide-angle x-ray scatter...

Formation of a composite from Se0 nanoparticles stabilized with polyvinylpyrrolidone and Acetobacter xylinum cellulose gel films was studied. The optimal sorption parameters at which the amorphous form of the selenium complex is preserved in the composite were suggested.

Lysine dendrimers of different generations containing covalently attached anthracene-based luminescent labels (one label per six dendrimer molecules) and fifth-generation heterodendrimers containing various amino acid units located between lysine fragments were synthesized. Homodendrimers were studied by means of the polarized luminescence techniqu...

The influence of salt additives on structural transformations in macromolecules of synthetic polymers free of ionogenic groups and DNA molecules has been determined with the use of the nanosecond dynamics luminescent method. When polyvalent metal salts are added, a coil-globule transition is observed in macromolecules of poly(N-n-propylmethacrylami...

The sorption and desorption of poly(vinylpyrrolidone)-Se0 (PVP-Se0) nanoparticles on gel films of cellulose Acetobacter xylinum (CAX) are investigated. It is revealed that the hydrodynamic radius R h of PVP-Se0 nanoparticles decreases from 57 nm in the initial solution (without CAX gel films) to 25 nm after the sorption of nanostructures on gel fi...

The data concerning the structural organization of supramolecular assemblies containing the dendrimer molecules of various generations, DNA-polycation of various chemical structure were obtained by analysing the changes of nanosecond mobility of macromolecules or low-molecular weight organic cations. Effect of water-soluble fullerene-containing com...

A quantitative method of estimating the efficiency of formation of macromolecular metal complexes of carboxyl-containing (co)polymers with transition-metal ions in dilute solutions was developed. This method is based on the luminescence quenching of luminescently labeled macromolecules by transition-metal ions. With the use of this method, the effe...

Nanosecond dynamics of molecules of thermosensitive polymers with different chemical structures in aqueous solutions was studied. Data on the structural organization of macromolecular chains above the temperature of phase separation were obtained. It was shown that either a globular monomacromolecular structure or a soluble micelle composed of seve...

The structure and sorption properties of gel films of bacterial cellulose were studied in its interaction with polyvinylpyrrolidone and silver nanoparticles stabilized by this compound.

Nanosecond dynamics of molecules of thermosensitive polymers with different chemical structures in aqueous solutions was studied. The data on the structural organization of macromolecular chains above the temperature of phase separation were obtained. It was shown that either a globular monomacromolecular structure or a soluble micelle composed of...

The fundamentals of the method for estimating the fullerene-binding power of polymer macromolecules and supramolecular formations are developed for fullerene C60. Polymers with covalently attached anthracene groups (one group per macromolecule) whose luminescence decreases in the presence of fullerene in solution in direct proportion to the stabili...

Changes in the nanosecond relaxation times of interacting polymer chains during the formation of poly(methacrylic acid)-poly(methyl methacrylate) stereopolycomplexes were studied by polarized luminescence. When macromolecules possessing the elements of internal structure are involved in the formation of a stereopolycomplex, competitive interactions...

Influence of various factors on formation of stereopoly complexes in dilute solutions in interaction of isotactic and syndiotactic polymethyl methacrylates is revealed by polarized-luminescence study of nanosecond dynamics of polymer chains. The thermal stability of stereopoly complexes is determined for each solvent over a broad temperature range...

It was established that the thermodynamic quality of solvent plays a decisive role both in the kinetics of intermolecular contact formation between iso and syndio configurations of PMMA at the first moment upon mixing of the dilute solutions, and in the subsequent structure formation. The latter process may lead to either a tertiary structure with...