Morphology and Structure of Carbon Nanoparticles Generated from Graphite Nitrate Co-intercalation Compound. Effect of Sonication Regime

2020 ◽  
pp. 41-47 ◽  
Author(s):  
E. V. Raksha ◽  
A. A. Davydova ◽  
Yu. V. Berestneva ◽  
M. V. Savoskin ◽  
V. A. Glazunova ◽  
...  
Keyword(s):  
Carbon Nanoparticles ◽  
Intercalation Compound ◽  
Graphite Nitrate ◽  
Morphology And Structure ◽  
Compound Effect

scholarly journals FEW-LAYER GRAPHENE PARTICLES BASED ON THERMALLY EXPANDED COINTERCALATE OF GRAPHITE NITRATE WITH ACETIC AND FORMIC ACIDS

2020 ◽  
pp. 580-590
Author(s):  
Алина Александровна Давыдова ◽  
Елена Владимировна Ракша ◽  
Оксана Николаевна Осколкова ◽  
Виктория Валерьевна Гнатовская ◽  
Петр Владимирович Сухов ◽  
...  
Keyword(s):  
Structural Characteristics ◽  
Intercalation Compound ◽  
Expanded Graphite ◽  
Thermally Expanded Graphite ◽  
X Ray Diffraction ◽  
Transmission Electron ◽  
Graphite Nitrate ◽  
Graphene Nanoparticles ◽  
Few Layer Graphene ◽  
Acetic Acids

Путем расслоения терморасширенного графита в этиловом и трет-бутиловом спиртах под действием ультразвука получены дисперсии малослойных графеновых наночастиц. Исходный терморасширенный графит получен термической обработкой в ударном режиме нагрева тройного соединения соинтеркалирования нитрата графита с уксусной и муравьиной кислотами. Проведено исследование структурных характеристик соинтеркалата нитрата графита и терморасширенного графита методом рентгенофазового анализа. Микроструктура и морфология полученных графеновых частиц исследованы методом просвечивающей электронной микроскопии. Dispersions of graphene nanoparticles were obtained by liquid phase exfoliation of thermally expanded graphite in ethanol as well as tert-butanol via sonication. Initial thermally expanded graphite was obtained by heat treatment in the shock mode of ternary graphite nitrate intercalation compound with formic and acetic acids. Investigation of the graphite nitrate intercalation compound and thermally expanded graphite structural characteristics by X-ray diffraction analysis has been carried out. The microstructure and morphology of the obtained graphene particles were studied by transmission electron microscopy.

scholarly journals CARBON NANOPARTICLES BASED ON THERMALLY EXPANDED GRAPHITE: EFFECT OF THE TEG OBTAINING ROUTE ON THE PARTICLES MORPHOLOGY

2021 ◽  
pp. 777-787
Author(s):  
Елена Владимировна Ракша ◽  
Валентина Александровна Глазунова ◽  
Оксана Николаевна Осколкова ◽  
Петр Владимирович Сухов ◽  
Галина Кузьминична Волкова ◽  
...  
Keyword(s):  
Carbon Nanoparticles ◽  
Expanded Graphite ◽  
Thermally Expanded Graphite ◽  
X Ray Diffraction ◽  
X Ray ◽  
Carbon Particles ◽  
Tert Butanol ◽  
Transmission Electron ◽  
Graphite Nitrate ◽  
Lower Temperature

В работе представлены результаты исследования морфологии углеродных наночастиц, образующихся при жидкофазном расслоении терморасширенного графита в трет-бутаноле. Используемый в работе терморасширенный графит получен путем термического расширения соинтеркалата нитрата графита с уксусной и муравьиной кислотами в режиме термоудара при 500°С и 900 °С. Исходный соинтеркалант по данным рентгенофазового анализа представляет собой смесь соединений II-й и IV-й стадий интеркалирования. Методом просвечивающей электронной микроскопии установлено, что дисперсии углеродных наночастиц, образующиеся при расслоении терморасширенного графита в трет-бутаноле под действием ультразвука, содержат в основном малослойные графены, планарные размеры которых достигают 8 мкм. Обсуждается влияние условий получения терморасширенного графита на морфологию образующихся углеродных наночастиц. Дисперсии на основе терморасширенного графита, полученного при более низкой температуре, помимо малослойных графенов содержат также значительное количество аморфных углеродных частиц с планарными размерами до 100 нм. The paper presents the investigation results of the morphology of carbon nanoparticles formed during liquid-phase exfoliation of thermally expanded graphite in tert-butanol. The thermally expanded graphite used in this work was obtained by thermal expansion of graphite nitrate with acetic and formic acids in the thermal shock mode at 500 °C and 900 °C. Initial cointercalate was shown by powder X-ray diffraction analysis to be the mixture of the II and the IV stage intercalation compounds. It has been established by transmission electron microscopy that dispersions of carbon nanoparticles formed during the exfoliation of thermally expanded graphite in tert-butanol via sonication contain mainly few-layer graphenes, the planar dimensions of which reach 8 pm. The influence of the conditions for thermally expanded graphite obtaining on the morphology of resulting carbon nanoparticles is discussed. Dispersions based on thermally expanded graphite obtained at a lower temperature, in addition to few-layer graphenes, also contain a significant amount of amorphous carbon particles with planar sizes up to 100 nm.

scholarly journals Triple graphite nitrate cointercalation compounds with acetic acid as precursors for thermally expanded graphite and carbon nanoparticles

2021 ◽  
Vol 2052 (1) ◽  
pp. 012035
Author(s):  
E V Raksha ◽  
A A Davydova ◽  
G K Volkova ◽  
O N Oskolkova ◽  
P V Sukhov ◽  
...  
Keyword(s):  
Acetic Acid ◽  
Liquid Phase ◽  
Carbon Nanoparticles ◽  
Expanded Graphite ◽  
Powder Xrd ◽  
Thermally Expanded Graphite ◽  
Structural Reorganization ◽  
Graphite Nitrate ◽  
Liquid Phase Exfoliation ◽  
Tem Method

Abstract Triple graphite nitrate cointercalation compounds (GNCCs) with acetic acid were synthesized, characterized by powder XRD and SEM methods, and used as a source of the thermally expanded graphite (TEG). Structural reorganization of graphite nitrate-acetate and triple GNCCs with acetic acid as a result of their exposition in air is discussed on the base of powder XRD data. Dispersions of carbon nanoparticles were prepared by liquid phase exfoliation of TEGs obtained from the GNCCs. It was demonstrated by TEM method that using of the studied TEGs as a source of carbon nanoparticles favours formation of few-layered graphene.

Carbon Nanoparticles Based on Graphite Nitrate Cointercalation Compounds

2018 ◽  
pp. 297-300
Author(s):  
E. V. Raksha ◽  
Yu. V. Berestneva ◽  
O. M. Padun ◽  
A. N. Vdovichenko ◽  
M. V. Savoskin ◽  
...  
Keyword(s):  
Carbon Nanoparticles ◽  
Graphite Nitrate

the effects of resonance with Jupiter in the system of short-period comets

1974 ◽  
Vol 22 ◽  
pp. 193-203
Author(s):  
L̆ubor Kresák
Keyword(s):  
Structural Effects ◽  
Order Resonance ◽  
Mean Motion ◽  
Short Period ◽  
The Mean ◽  
Compound Effect ◽  
Low Order

AbstractStructural effects of the resonance with the mean motion of Jupiter on the system of short-period comets are discussed. The distribution of mean motions, determined from sets of consecutive perihelion passages of all known periodic comets, reveals a number of gaps associated with low-order resonance; most pronounced are those corresponding to the simplest commensurabilities of 5/2, 2/1, 5/3, 3/2, 1/1 and 1/2. The formation of the gaps is explained by a compound effect of five possible types of behaviour of the comets set into an approximate resonance, ranging from quick passages through the gap to temporary librations avoiding closer approaches to Jupiter. In addition to the comets of almost asteroidal appearance, librating with small amplitudes around the lower resonance ratios (Marsden, 1970b), there is an interesting group of faint diffuse comets librating in characteristic periods of about 200 years, with large amplitudes of about±8% in μ and almost±180° in σ, around the 2/1 resonance gap. This transient type of motion appears to be nearly as frequent as a circulating motion with period of revolution of less than one half that of Jupiter. The temporary members of this group are characteristic not only by their appearance but also by rather peculiar discovery conditions.

The interaction of carbon nanoparticles with neutrophilic granulocytes: a target for therapeutic approaches

Pneumologie ◽  
2013 ◽  
Vol 67 (12) ◽  
Author(s):  
U Sydlik ◽  
U Krämer ◽  
M Kroker ◽  
A Paunel ◽  
S Keymel ◽  
...  
Keyword(s):  
Carbon Nanoparticles ◽  
Neutrophilic Granulocytes ◽  
Therapeutic Approaches

Scale Development: Measuring Job-Family Incivility

2019 ◽  
pp. 31-48
Author(s):  
W G S Mahalekamge ◽  
Nilakshi W K Galahitiyawe
Keyword(s):  
Scale Development ◽  
Work Environment ◽  
Development Process ◽  
Workplace Incivility ◽  
Dynamic Processes ◽  
Validity And Reliability ◽  
Development Approach ◽  
The Impact ◽  
Compound Effect

The main contribution of this paper is the development of the job-family incivility scale. This paper seeks to explore the complex inter-relationships between workplace incivility and family incivility dimensions of job-family incivility by examining the dynamic processes by which job-family incivility is initiated and sustained using a scale development approach. In doing so, the paper highlights the absence of valid and reliable measures that estimate the compound effect of workplace incivility and family incivility – referred to as job-family incivility. A scale development process introduced by Quazi et al. (2016) is presented and stages in the construction of the scale are discussed including measures of validity and reliability. The findings of the study demonstrate the validity and reliability of the job-family incivility scale developed by the current researchers. The main aims of this research are to emphasize the impact of workplace incivility and family incivility on the employees in the work environment, and to discuss the techniques that can be used to mitigate such detrimental activities.

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