scholarly journals ИНФРАКРАСНАЯ СПЕКТРОСКОПИЯ КАК МЕТОД ОПРЕДЕЛЕНИЯ СТРУКТУРНЫХ ОТКЛИКОВ ПРИРОДНЫХ ГЛИН НА СВЧ-ВОЗДЕЙСТВИЕ

2019 ◽  
Vol 21 (3) ◽  
pp. 446-454
Author(s):  
Anna G. Chetverikova ◽  
Olga N. Kanygina ◽  
Gulzhazira Zh. Alpysbaeva ◽  
Alexander A. Yudin ◽  
Saniya S. Sokabayeva
Keyword(s):  
Near Infrared ◽  
Condensed Matter ◽  
Measurement Techniques ◽  
Interatomic Interaction ◽  
Inorganic Materials ◽  
Polycrystalline Materials ◽  
Natural Clay ◽  
Multilayer Nanostructures ◽  
Bentonite Clays

Методом ИК-спектроскопии изучены структурные отклики частиц монтмориллонитовой и каолинитовой глин месторождений Оренбургской области на СВЧ-воздействие. Обработку проб в течение 10 минут проводили в поле магнетрона мощностью 750 Вт в воздушной и влажной средах. Спектры получены с помощью ИК-Фурье спектрометра в диапазоне длин волн 4000–400 cм-1. Установлено, что в монтмориллонитовой глине количество доминирующих связей в тетраэдре SiO4 снижается в 1.5 раза при обработке в сухом воздухе и в 1.8 раза – во влажном. В глине, содержащей каолинит, все типы связей активно разрушаются под воздействием СВЧ-поля.     ИСТОЧНИК ФИНАНСИРОВАНИЯРабота выполнена при финансовой поддержке РФФИ и правительства Оренбургской области в рамках научного проекта № 19-43-560001 р_а «Физико-химические принципы процессов СВЧ-консолидации каолинитов».       REFERENCES Domashevskaya, E. P., Builov, N. S., Lukin, A. N. Sitnikov A. V. IR spectroscopic study of interatomic interaction in [(CoFeB)60C40/SiO2]200 and [(CoFeB)34(SiO2)66/C]46 multilayer nanostructures with metal-containing composite layers. Neorganicheskie materialy [Inorganic Materials], 2018, v. 54(9), pp. 140−146 https://doi.org/10.1134/S002016851802005X Chetverikova, A. G., Maryakhina V. S. Studies of polymineral clay containing three-layer aluminosilica tes by physical methods. Vestnik Orenburgskogo gosudar stvennogo universiteta, 2015, no. 1, pp. 250−255. (in Russ.) Chetverikova A. G., Filyak M. M., Kanygina O. N. Evolution of phase morphology in dispersed clay systems under the microwave irradiation. Ceramica, 2018, v. 64(371), pp. 367−372. https://doi.org/10.1590/0366-69132018643712354 Filyak M. M., Chetverikova A. G., Kanygina O. N., Bagdasaryan L. S. Fractal formalism as applied to the analysis of the microwave modifi cation of disperse systems. Kondensirovannye sredy i mezhfaznye granitsy [Condensed Matter and Interphases], 2016, v. 18(4), pp. 578−585. URL: https://journals.vsu.ru/kcmf/article/view/168/94 (in Russ.) Kanygina O. N., Filyak M. M., Chetverikova A. G. Microwave-Induced Phase Transformations of Natural Clay in Air and Humid Media. Neorganicheskie materially [Inorganic Materials], 2018, v. 54(9), pp. 904–909. https://doi.org/10.1134/S0020168518090042 Yavna V. A., Kasprzhitskii A. S., Lazorenko G. I., Kochur A. G. Study of IR spectra of a polymineral natural association of phyllosilicate minerals. Optics and Spectroscopy, 2015, v. 118(4), pp. 526−536. https://doi.org/10.7868/S0030403415040224 Chetverikova A. G., Kanygina O. N., Filyak M. M., Savinkova E. S. Physical optics methods of recording weak structural responses of dispersed clay systems to the effect of microwave radiation. Measurement Techniques, 2018, v. 60(1)1, pp. 1109−1115. https://doi.org/10.1007/s11018-018-1326-4 Stevenson C. M., Gurnick M. Structural collapse in kaolinite, montmorillonite and illite clay and its role in the ceramic rehydroxylation dating of low-fi red earthenware. Journal of Archaeological Science, 2016, v. 69, pp. 54−63. https://doi.org/10.1016/j.jas.2016.03.004 De Oliveira C. I. R., Rocha M. C. G., Da Silva A. L. N., Bertolino L. C. Characterization of bentonite clays from Cubati, Paraíba (Northeast of Brazil). Ceramica, 2016, vol. 62, Iss. 363, pp. 272−277. https://doi.org/10.1590/0366-69132016623631970 Plyusnina, I. I. Infrakrasnye spektry mineralov [Infrared spectra of minerals]. Moscow, Moscow University Publ., 1976, 190 p. (in Russ.) ISO 11464:2006 Soil quality – Pretreatment of samples for physico-chemical analysis, ISO STANDARD, 2006, 11 p. Šaponjić A., Šaponjić Đ., Nikolić V, Milošević M., Marinović-Cincović M., Gyoshev S., Vuković M., Kokunešoski M. Iron (III) oxide fabrication from natural clay with reference to phase transformation g- →a-Fe2O3 // Science of Sintering, 2017, v. 49(2), pp. 197–205. https://doi.org/10.2298/SOS1702197S Kool A., Thakur P., Bagchi B., Hoque N.A., Das S. Mechanical, dielectric and photoluminescence properties of alumina-mullite composite derived from natural Ganges clay. Applied Clay Science, v. 114, 2015, pp. 349−358. https://doi.org/10.1016/j.clay.2015.06.021 Stack K. M., Milliken R. E. Modeling near-infrared refl ectance spectra of clay and sulfate mixtures and implications for Mars. Icarus, v. 250, 2015, pp. 332−356. https://doi.org/10.1016/j.icarus.2014.12.009 Anadгo P., Pajolli I. L. R., Hildebrando E. A., Wiebeck H. Preparation and characterization of carbon/montmorillonite composites and nanocomposites from waste bleaching sodium montmorillonite clay. Advanced Powder Technology, 2014, v. 25(3), pp. 926−932. https://doi.org/10.1016/j.apt.2014.01.010 Lazorenko G. I., Kasprzhitskii A. S., Yavna V. A. Application of IR spectroscope to determine mechanical properties of polycrystalline materials based on layered aluminosilicate . Kondensirovannye sredy i mezhfaznye granitsy [Condensed Matter and Interphases], 2014, vol. 16, no. 4, pp. 479−485. URL: http://www.kcmf. vsu.ru/resources/t_16_4_2014_011.pdf (in Russ.)

Interface structures in polycrystalline ceramic materials

1986 ◽  
Vol 44 ◽  
pp. 468-471
Author(s):  
K. J. Morrissey
Keyword(s):  
Electron Microscopy ◽  
Analytical Electron Microscopy ◽  
Physical And Mechanical Properties ◽  
High Resolution Electron Microscopy ◽  
Ceramic Materials ◽  
Polycrystalline Materials ◽  
Transmission Electron ◽  
Resolution Electron ◽  
Interface Structures

Grain boundaries and interfaces play an important role in determining both physical and mechanical properties of polycrystalline materials. To understand how the structure of interfaces can be controlled to optimize properties, it is necessary to understand and be able to predict their crystal chemistry. Transmission electron microscopy (TEM), analytical electron microscopy (AEM,), and high resolution electron microscopy (HREM) are essential tools for the characterization of the different types of interfaces which exist in ceramic systems. The purpose of this paper is to illustrate some specific areas in which understanding interface structure is important. Interfaces in sintered bodies, materials produced through phase transformation and electronic packaging are discussed.

Highly Fluorescent Au25-xAgx Nanoclusters Protected with Poly(ethylene glycol) - and Zwitterion-Modified Thiolate Ligands

2018 ◽  
Author(s):  
Dinesh Mishra ◽  
Sisi Wang ◽  
Zhicheng Jin ◽  
Eric Lochner ◽  
Hedi Mattoussi
Keyword(s):  
Quantum Yield ◽  
Near Infrared ◽  
Small Diameter ◽  
Binding Energies ◽  
Thiolate Ligands ◽  
Nir Emission ◽  
Thiolate Complexes ◽  
Long Lifetime ◽  
Poly Ethylene

<p>We describe the growth and characterization of highly fluorescing, near-infrared-emitting nanoclusters made of bimetallic Au<sub>25-x</sub>Ag<sub>x</sub> cores, prepared using various monothiol-appended hydrophobic and hydrophilic ligands. The reaction uses well-defined triphenylphosphine-protected Au<sub>11</sub> clusters (as precursors), which are reacted with Ag(I)-thiolate complexes. The prepared nanoclusters are small (diameter < 2nm, as characterized by TEM) with emission peak at 760 nm and long lifetime (~12 µs). The quantum yield measured for these materials was 0.3 - 0.4 depending on the ligand. XPS measurements show the presence of both metal atoms in the core, with measured binding energies that agree with reported values for nanocluster materials. The NIR emission combined with high quantum yield, small size and ease of surface functionalization afforded by the coating, make these materials suitable to implement investigations that address fundamental questions and potentially useful for biological sensing and imaging applications.<br></p>

Optical Absorption Spectroscopy of DNA-Wrapped HiPco Carbon Nanotubes

2019 ◽  
Vol 943 ◽  
pp. 95-99
Author(s):  
Li Jun Wang ◽  
Kazuo Umemura
Keyword(s):  
Carbon Nanotubes ◽  
Aqueous Solution ◽  
Optical Absorption ◽  
Absorption Spectroscopy ◽  
Near Infrared ◽  
Nir Spectroscopy ◽  
Optical Characterization ◽  
Optical Absorption Spectroscopy ◽  
Double Stranded Dna

Optical absorption spectroscopy provides evidence for individually dispersed carbon nanotubes. A common method to disperse SWCNTs into aqueous solution is to sonicate the mixture in the presence of a double-stranded DNA (dsDNA). In this paper, optical characterization of dsDNA-wrapped HiPco carbon nanotubes (dsDNA-SWCNT) was carried out using near infrared (NIR) spectroscopy and photoluminescence (PL) experiments. The findings suggest that SWCNT dispersion is very good in the environment of DNA existing. Additionally, its dispersion depends on dsDNA concentration.

Dielectric Characterization of Polyceram Films

1990 ◽  
Vol 180 ◽  
Author(s):  
G. Teowee ◽  
J.M. Boulton ◽  
H.H. Fox ◽  
A. Koussa ◽  
T. Gudgel ◽  
...  
Keyword(s):  
Dielectric Constant ◽  
Polyethylene Oxide ◽  
Dielectric Materials ◽  
Inorganic Materials ◽  
Functionalized Polymers ◽  
Multifunctional Materials ◽  
Dielectric Characterization ◽  
Silicon Alkoxides ◽  
Tan Δ

ABSTRACTPolycerams are an emergent class of hybrid, multifunctional materials which combine the properties of organic and inorganic materials. Films have been prepared from silicon alkoxides and reactive, functionalized polymers such as triethoxysilyl modified polybutadiene (MPBD), (N-triethoxysilylpropyl)O polyethylene oxide urethane (MPEOU) and trimethoxysilylpropyl substituted polyethyleneimine (MPEI). Characterization of dielectric constant and tan δ of the films has been carried out over a range of frequency from 500 Hz to 100 kHz; and the results are used to consider the potential of Polycerams as dielectric materials.

Characterization of solid inorganic and coordination compounds by their near infrared reflection spectra

1966 ◽  
Vol 19 (10) ◽  
pp. 1785 ◽  
Author(s):  
AF Reid
Keyword(s):  
Coordination Compounds ◽  
Near Infrared ◽  
Organometallic Compounds ◽  
Reflection Spectra ◽  
Convenient Means ◽  
Infrared Reflection ◽  
Number Of Classes

The near infrared combination spectra of a number of classes of solid inorganic and coordination compounds have been recorded and assigned. The spectra are shown to be typical of particular ligands regardless of the compounds in which they are contained, and to serve as an experimentally convenient means of characterization of solid coordination or organometallic compounds.

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