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Koizhaiganova R.,Kyungpook National University | Koizhaiganova R.,Institute of Polymer Materials and Technology | Kim H.J.,Kyungpook National University | Vasudevan T.,Kyungpook National University | And 2 more authors.
Journal of Applied Polymer Science | Year: 2010

Poly(3-alkylthiophene)s represent a family of conjugated polymers that are soluble and processable, but still retaining the good electrical conductivity of the insoluble parent polymer thiophene ring backbone. Poly(3-hexylthiophene) (P3HT) is reported to be a best candidate in the family for solar cell applications. In situ polymerization of 3-hexylthiophene monomer with double-walled carbon nanotubes (DWCNTs) has been attempted with the aim of addressing two main issues, namely, the interfacial bonding and proper dispersion of the carbon nanotubes in the polymer matrix to get a high-performing polymer/nanocomposite. Fourier transform infrared spectroscopy, Raman, and X-ray diffraction studies indicate the physical wrapping of the polymer on the nanotubes in the absence of any ground-state interaction between them. The ultraviolet-visible measurements also support this view. The photoluminescence quenching indicates the effectiveness of the interface in the formation of the donor-acceptor-type composite. The impressive conductivity values encourage the utility of the composites as photovoltaic material. © 2009 Wiley Periodicals, Inc.


Dolya N.,University of Potsdam | Rojas O.,University of Potsdam | Kosmella S.,University of Potsdam | Tiersch B.,University of Potsdam | And 3 more authors.
Macromolecular Chemistry and Physics | Year: 2013

This paper focuses on two different strategies to incorporate gold nanoparticles (AuNPs) into the matrix of polyacrylamide (PAAm) hydrogels. Poly(ethyleneimine) (PEI) is used as both reducing and stabilizing agent for the formation of AuNPs. In addition, the influence of an ionic liquid (IL) (i.e., 1-ethyl-3-methylimidazolium ethylsulfate) on the stability of the nanoparticles and their immobilization in the hydrogel is investigated The results show that AuNPs surrounded by a shell containing PEI and IL, synthesized according to the "one-pot" approach, are much better immobilized within the PAAm hydrogel. Hereby, the IL is responsible for structural changes in the hydrogel as well as the improved stabilization and embedding of the AuNPs into the polymer gel matrix. Copyright © 2013 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Ibragimov R.,Kazakh National Technical University | Gusenov I.,Kazakh National Technical University | Tatykhanova G.,Kazakh National Technical University | Adilov Z.,Kazakh National Technical University | And 3 more authors.
Journal of Dispersion Science and Technology | Year: 2013

This article reports the efficiency of polymer-gellan as an oil displacement agent in comparison with water and polyacrylamide (PAM), which is traditionally used in the oil industry. The terrigenous and carbonate rocks used as core materials were characterized by scanning electron microscope. The porosity and permeability of the core materials were also determined. Sol-gel transition of polysaccharide-gellan in the presence of various salts was studied. It was found that the effectiveness of salts to enhance gelation follows this order: CaCl2 ≈ MgCl2 > KCl > NaCl. Influence of storage time and temperature on the viscosity of gellan was evaluated. Laboratory experiments on water flooding and polymer flooding methods were carried out on sand-packed model. Results of oil displacement experiments from sand-packed model and core samples were compared. It was shown that gellan and PAM show almost equal values of the oil displacement coefficient, which is 60-65%, while injection of water gives only 30-45%. Oil displacement process was visualized on cross sections of sand-packed model. Optimal concentration of gellan solution for oil displacement, which depends on absolute permeability of rock, was found. © 2013 Copyright Taylor and Francis Group, LLC.


Kudaibergenov S.E.,Kazakh National Technical University | Kudaibergenov S.E.,Institute of Polymer Materials and Technology | Nuraje N.,Massachusetts Institute of Technology | Khutoryanskiy V.V.,University of Reading
Soft Matter | Year: 2012

This review describes the state-of the-art of nano-, micro- and macrogels, membranes, micro- and nanocapsules, as well as multilayered thin films exhibiting amphoteric character. The synthetic strategies and physicochemical properties of amphoteric materials are outlined in light of the stimuli-responsive behavior and their potential application in nanotechnology, biotechnology and medicine. This journal is © 2012 The Royal Society of Chemistry.


Kudaibergenov S.,Kazakh National Technical University | Kudaibergenov S.,Institute of Polymer Materials and Technology | Adilov Z.,Kazakh National Technical University | Berillo D.,Institute of Polymer Materials and Technology | And 5 more authors.
Express Polymer Letters | Year: 2012

Macroporous amphoteric gels based on allylamine, methacrylic acid and acrylamide crosslinked by N,N!-methylenebisacrylamide were synthesized by radical copolymerization of monomers in cryoconditions. The composition of cryogels was determined by combination of potentiometric and conductimetric titrations. The morphology of cryogels was evaluated by scanning electron microscope (SEM). Cryogels exhibited sponge-like porous structure with pore size ranging from 50 to 200 μm. The values of the isoelectric points (IEPs) determined from the swelling experiments arranged between 3.5 and 4.3. The high adsorption-desorption capacity of amphoteric cryogels with respect to mM and trace concentrations of copper, nickel, and cobalt ions was demonstrated. It was shown that the macroporous amphoteric cryogels are able to adsorb up to 99.9% of copper, nickel, and cobalt ions from 10 -3 mol·L -1 aqueous solution. © BME-PT.


Tatykhanova G.S.,Kazakh National Technical University | Tatykhanova G.S.,Institute of Polymer Materials and Technology | Klivenko A.N.,Al-Farabi Kazakh National University | Kudaibergenova G.M.,Institute of Polymer Materials and Technology | And 2 more authors.
Macromolecular Symposia | Year: 2016

Macroporous amphoteric cryogel based on N,N-dimethylaminoethylmethacrylate and methacrylic acid p(DMAEM-co-MAA) was used for immobilization of gold nanoparticles (AuNPs). The structure of AuNPs immobilized within macroporous amphoteric cryogel is mostly represented by spherical and triangular species. Amphoteric cryogel with immobilized AuNPs was tested as flow-through catalytic reactor in reduction of 4-nitrophenol by NaBH4. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Tursunova R.,Kazakh National Technical University | Yesmurzayeva N.,Kazakh National Technical University | Yesmurzayeva N.,Institute of Polymer Materials and Technology | Selenova B.,Kazakh National Technical University | And 2 more authors.
Journal of Inorganic and Organometallic Polymers and Materials | Year: 2016

This paper is devoted to preparation of gold–copper bimetallic nanoparticles deposited on inorganic supporters followed by their use in hydrogen peroxide decomposition and oxidation of ethylbenzene. The bimetallic nanoparticles of Au–Cu at molar ratio of 1:1 were synthesized by hydrothermal method in the presence of stabilizing agent—poly (N-vinyl-2-pyrrolidone) and reducing agent—glycine. The bimetallic nanoparticles were characterized by UV–Vis spectroscopy, DLS, and TEM techniques. The catalytic activity of Au–Cu bimetallic nanoparticles was evaluated with respect to decomposition of hydrogen peroxide and oxidation of ethylbenzene. © 2016 Springer Science+Business Media New York


Yesmurzayeva N.,Kazakh National Technical University | Yesmurzayeva N.,Institute of Polymer Materials and Technology | Malibekova A.,Kazakh National Technical University | Selenova B.,Kazakh National Technical University
Macromolecular Symposia | Year: 2016

Summary The present work deals with evaluation of the catalytic properties of polyvanadate xerogels deposited on titanium dioxide (anatase). Xerogels of polyvanadates in the form of nanofibers were obtained by sol-gel method. The average sizes of polyvanadate nanoparticles in aqueous solution determined by DLS were equal to 7 and 50 nm. TEM results reveal the formation of nanostructured thin layers of polyvanadates on the surface of TiO2 particles. The catalytic properties of polyvanadates deposited on the surface of anatase by impregnation method were studied with respect to decomposition of hydrogen peroxide and oxidation of o-xylene under mild conditions. © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.


Kudaibergenov S.E.,Kazakh National Technical University | Kudaibergenov S.E.,Institute of Polymer Materials and Technology | Tatykhanova G.S.,Kazakh National Technical University | Tatykhanova G.S.,Institute of Polymer Materials and Technology | Selenova B.S.,Kazakh National Technical University
Journal of Inorganic and Organometallic Polymers and Materials | Year: 2016

This mini-review is focused on preparation of polymer protected gold (AuNPs) and silver (AgNPs) nanoparticles that are immobilized on the surface of inorganic supporters and within hydrogel and/or cryogel matrices. A series of water soluble polymers such as poly(N-vinylpyrrolidone), poly(acrylic acid), branched polyethyleneimine, and amphoteric cryogel based on the copolymer of N,N-dimethylaminoethylmethacrylate and methacrylic acid poly(DMAEM-MAA) were used for reduction and stabilization of metal nanoparticles. The catalytic properties of polymer protected AuNPs and AgNPs were evaluated with respect to hydrogen peroxide decomposition, hydrogenation of 4-nitrophenol and oxidation of cyclohexane. © 2016 Springer Science+Business Media New York


Seliverstova E.,Karaganda State University | Ibrayev N.,Karaganda State University | Kudaibergenov S.,Kazakh National Technical University | Kudaibergenov S.,Institute of Polymer Materials and Technology
Journal of Applied Polymer Science | Year: 2013

This article is devoted to investigation of interaction between polycomplex and dye molecules assembled in fluorescent thin solid Langmuir-Blodgett (LB) films. Preparation procedure of organosoluble stoichiometric polycomplex based on cationic polyelectrolyte and anionic surfactant is described. Formation of mixed monolayers consisting of polyelectrolyte-surfactant complex (PSC) and dye molecules-Nile Red (NR) at water-air interface is shown. Assembling conditions of LB films based on PSC and NR are defined and the spectral-luminescent properties of obtained films are studied. It is shown that when nonamphiphilic NR and PSC are mixed the excellent monolayers formed, which can easily be transferred onto solid substrates by Langmuir-Blodgett method with a high transfer coefficient. Absorption and fluorescence spectra of mixed LB films reveal the formation of dimers and existence of monomers in LB films. Copyright © 2012 Wiley Periodicals, Inc.

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