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Общее количество найденных документов : 38
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 1-10    11-20   21-30   31-38 
1.
Инвентарный номер: нет.
   
   E 27

   
    Effect of polarity of solvent on silanization of halloysite nanoclay using (3-glycidyloxy propyl) trimethoxy silane / A. M. Abu el-Soad, A. V. Pestov, N. A. Martemyanov [et al.] // Journal of inorganic and organometallic polymers and materials. - 2021. - № 31. - P2569–2578
ББК Г
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: The grafting of silane groups on clay surfaces has been recently investigated in order to fabricate versatile compounds with new potential applications in materials science and ecological engineering. This work explored the influence of variety of solvents with variable polarity on the silanization of halloysite nanoclay (HNT) surface by (3-Glycidyloxy propyl) trimethoxy silane. To this purpose, the functionalization of HNT by 3-Glycidyloxypropyltrimethoxysilane (GOPTMS) has been conducted in Ethanol (polar protic solvent), Tetrahydrofuran (THF) and Acetonitrile (polar aprotic solvents), and Hexane, 1,4-Dioxane and Toluene (non polar solvents). The silane grafted materials were characterized by using several techniques, including Fourier Transform Infrared Spectroscopy (FT-IR), elemental analysis, Scanning Electron Microscopy (SEM), Thermogravimetry (TGA), X-ray Diffraction Analysis (XRD) and Nitrogen adsorption/desorption isotherms. The largest silane loading has been detected for the hybrid nanomaterials prepared in Hexane as a dispersing medium.

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2.
Инвентарный номер: нет.
   
   S 98

   
    Synthesis and spectroscopic study of Si, Ti, Mg, and Zn oxides modified by L-Proline / O. V. Koryakova, M. S. Valova, Y. A. Titova [et al.] // Journal of Applied Spectroscopy. - 2021. - Vol. 88, № 3. - P519-527
ББК Г
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Individual and mixed oxides of Zn, Mg, Si, and Ti modified with L-proline during their solgel synthesis have been obtained. The IR spectra of these oxides studied in detail show changes in the vibrational band parameters of the siliconoxygen and metal–oxygen bonds. Enhancement of the amount of basic sites on the SiO2–TiO2 mixed oxide was found after removal of L-proline from the surface. The use of SiO2–Mg(OH)2* L-proline composite as a catalyst leads to an enhanced enantiomeric excess of some asymmetric Biginelli reaction products up to 18%.

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3.
Инвентарный номер: нет.
   
   I-60

   
    Influence of the structure of the aminoalkyl group in polysiloxane on the selectivity of its interaction with metal ions / A. S. Kholmogorova, E. A. Fedoseeva, L. K. Neudachina [et al.] // Russian Journal of Applied Chemistry. - 2021. - Vol. 94, № 4. - P478-485
ББК Г
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Polysiloxanes containing nonchelating 3-aminopropyl and chelating N-(2-aminoethyl)-3-aminopropyl groups with the degree of functionalization of 28 and 24%, respectively, were prepared by sol–gel synthesis. The polysiloxanes obtained showed comparable activity in sorption of Pd(II), Pt(IV), Fe(III), Cd(II), Zn(II), Co(II), Ni(II), Cu(II), Mn(II), Pb(II), Ca(II), and Mg(II) ions from model multicomponent solutions. At pH 3,3-aminopropylpolysiloxane selectively takes up platinoid ions. The chelating structure of N-(2-aminoethyl)-3-aminopropyl groups leads to a decrease in the selectivity of the interaction with Pd(II) ions but increases the affinity for Fe(III), Ni(II), and Cu(II). Preconcentration in the dynamic mode allows quantitative sorption of Pd(II) and Pt(IV), followed by virtually quantitative elution of the metal ions from the sorbent surface.

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4.
Инвентарный номер: нет.
   
   F 33

   
    Features of sorption preconcentration of noble metal ions with sulfoethylated amino polymers / L. M. Alifkhanova, K. Y. Lopunova, A. A. Marchuk [и др.] // Russian journal of inorganic chemistry. - 2021. - Vol. 66, № 6. - С. 909-915
ББК Г
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Аннотация: Dependencies for the sorption of palladium(II), gold(III), and platinum(IV) chloro complexes from individual and binary solutions with sorbents based on sulfoethylated polyallylamine and poly(aminostyrene) have been obtained. It has been found that predominant sorption mechanism is complexation with functional groups of the sorbents for gold(III) and palladium(II) and ion exchange for platinum(IV). It has been shown that increase in the sulfoethylation degree of aminopolymer matrix leads to decrease of platinum(IV) sorption and therefore, to increase in palladium(II) sorption selectivity relative to this ion. This effect is the largest for the sorbents based on polyallylamine. The conditions of quantitative desorption of the studied metals from sorbent surface have been determined. The sorption of gold(III) by the sorbent based on polyallylamine has been shown to be complicated by gold(III) reduction in sorbent phase.

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5.
Инвентарный номер: нет.
   

   
    Silica coating of Fe3O4 magnetic nanoparticles with pmida assistance to increase the surface area and enhance peptide immobilization efficiency / A. M. Demin, A. I. Maksimovskikh, A. V. Mekhaev [и др.] // Ceramics international. - 2021. - № б/н. - P1-6
Рубрики: ХИМИЧЕСКИЕ НАУКИ

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6.
Инвентарный номер: нет.
   
   P 91

   
    Preparation and antifrictional properties of surface modified hybrid fluorine-containing silica particles / T. I. Gorbunova, A. Ya. Zapevalov, I. V. Beketov, T. M. Demina, O. R. Timoshenkova, A. M. Murzakaev, V. S. Gaviko, A. P. Safronov, V. I. Saloutin // Applied Surface Science. - 2015. - Vol. 326. - С. 19-26
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ANTIFRICTIONAL PROPERTIES -- SILICA PARTICLES -- HYBRID FLUORINE-CONTAINING SILICA PARTICLES

\\\\expert2\\NBO\\Applied Surface Science\\2015, v.326, p.19.pdf
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7.
Инвентарный номер: нет.
   
   F 70

   
    Fluorescent Detection of 2,​4-​DNT and 2,​4,​6-​TNT in Aqueous Media by Using Simple Water-​Soluble Pyrene Derivatives [Electronic resource] / I. S. Kovalev, O. S. Taniya, N. V. Slovesnova, G. A. Kim, S. Santra, G. V. Zyryanov, D. S. Kopchuk, A. Majee, V. N. Charushin, O. N. Chupakhin // Chemistry - An Asian Journal. - 2016. - Vol. 11, № 5. - С. 775-781
ББК 54
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
HERBICIDES -- PYRENE DERIVATIVES
Аннотация: Pyrene-contg. water-sol. probes for the fluorescent detection of nitroarom. compds. (NACs), such as explosive components (2,4-DNT and 2,​4,​6-​TNT) and herbicides (2,4-​dinitrocresol, 2,4-DNOC)​, in aq. media are reported. In the probes, the introduction of surface-​active hydrophilic heads at the periphery of lipophilic (i.e., hydrophobic) pyrene tails resulted in the formation of highly fluorescent micelle-​like aggregates​/pre-​assocs. in aq. solns. at concns. of ≤10-5M. The enhanced fluorescence quenching of the herein reported architectures is achieved in the presence of ultra-​trace amts. of TNT or 2,4-DNT with values of Stern-​Volmer quenching const. close to 1 × 105M and a detection limit as low as 182 ppb. The most hydrophilic probes demonstrated higher response to 2,​4-​DNT over TNT. Filter paper test strips impregnated with 1 × 10-​5M solns. of the probes were able to detect TNT, 2,​4-​DNT, and other NACs at levels as low as 50 ppb in water.

\\\\expert2\\NBO\\Chemistry - an Asian Journal\\2016. 11(5). P. 775-781.pdf
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8.
Инвентарный номер: нет.
   

   
    Synthesis and physicochemical and catalytic properties of composites in the Sio2–Zro2 system / A. N. Murashkevich, O. A. Alisienok, E. S. Novik [et al.] // Inorganic materials. - 2020. - Vol. 56, № 4. - P430-436
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
ACID-BASE PROPERTIES -- CATALYSIS -- COMPOSITE -- SILICA -- SPECIFIC SURFACE AREA -- ZIRCONIA
Аннотация: Using coprecipitation, a sol–sol method, and molecular layering, we have synthesized SiO2–ZrO2 composites with SiO2 : ZrO2 ratios from 1 : 1 to 9 : 1 and a large specific surface area, which increases with growth silicon-containing component concentration. Using adsorption of Hammett indicators, we have assessed the concentration of acid–base centers in the pK range 1.3–9.6, which has been shown to vary from 68 to 160 μmol/g. Elemental analysis and IR spectroscopy data have demonstrated the presence of not only water but also nitrate ions and carbon dioxide on the surface of the samples. It has been shown that the use of nanoparticulate SiO2–ZrO2 oxides as heterogeneous catalysts—promoters for (2S,4R)-4-hydroxyprolyl-(S)-1-phenylethylamine trifluoroacetate, a chiral inducer in the asymmetric Biginelli reaction, makes it possible to raise ee (enantiomeric excess) from 39 to 68% and the reaction yield from 29 to 55%.

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9.
Инвентарный номер: нет.
   
   I-55

   
    Immobilization of pmida on Fe3O4 magnetic nanoparticles surface: mechanism of bonding / A. M. Demin, A. V. Mekhaev, V. P. Krasnov, A. A. Esin, D. K. Kuznetsov, P. S. Zelenovskiy, Y. Y. Shur // Applied surface science. - 2018. - V 440. - С. 1196-1203
ББК 24
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
FTIR -- MAGNETIC NANOPARTICLES -- MECHANISM OF IMMOBILIZATION -- PMIDA -- TGA -- XPS
Аннотация: The mechanism of N-phosphonomethyl iminodiacetic acid (PMIDA) binding with the Fe3O4 magnetic nanoparticle (MNPs) surface by Fourier transformed infrared spectroscopy, X-ray photoelectron spectroscopy and thermogravimetry was comprehensive studied. To study of microstructure, size and core structure of synthesized nanoparticles the scanning electron microscopy, X-ray diffraction analysis and Raman spectroscopy were carried out. A new scheme for the tridentate bonding of the phosphonomethyl derivative with surface Fe atoms involving unequal P–O–Fe bonds was proposed. The mechanism of thermal decomposition of PMIDA molecules on the MNP surface was studied using a thermogravimetric analyzer combined with infrared spectrometer. It was shown for the first time that during the thermal treatment of phosphonomethyl-modified MNPs, PMIDA molecules are not desorbed from the surface of MNPs but gradually decompose. We believe that obtained in this work data will be useful for a deeper understanding of the mechanisms of phosphonic acid derivatives interaction with MNPs, as well as in the design of new biomedical materials, in which the conjugation of biomolecules with carboxyl groups of PMIDA-modified MNPs is assumed.

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10.
Инвентарный номер: нет.
   
   S 98

   
    Synthesis of Fe@C nanoparticles containing sulfo groups on their surfaces and study of their aggregation behavior in aqueous media / I. A. Bakhteeva, I. V. Medvedeva, I. V. Byzov [et al.] // Russian chemical bulletin. - 2021. - Vol. 70, № 4. - P722-731
ББК Г
Рубрики: ХИМИЧЕСКИЕ НАУКИ
Кл.слова (ненормированные):
MAGNETIC NANOPARTICLES -- IRON-CARBON -- BENZENESULFONIC ACID -- IR SPECTROSCOPY
Аннотация: Magnetic iron nanoparticles (MNPs) encapsulated in a carbon shells and containing sulfo groups on the surface (Fe@C-SO3H) were synthesized. The aggregative stability of aqueous suspensions of the Fe@C-SO3H nanoparticles was studied in solutions of bovine serum albumin and calcium chloride and in phosphate-buffered saline, which simulate blood plasma. It is shown that the Fe@C-SO3H particles practically do not aggregate in the phosphate buffer saline for a long time (several days). On the contrary, MNPs encapsulated in a protein shells using ultrasonic treatment form aggregates up to 110–120 nm in size under these conditions. Suspensions of the Fe@C-SO3H particles are stable in aqueous solutions of calcium chloride in the range of the solid phase concentration between 0.05 and 0.10 g L−1. The results obtained indicate the possibility of using the functionalized Fe@C-SO3H nanoparticles in vitro experiments in biological media.

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