Structuring of graphene oxide interacting with nanodiamonds in aqueous dispersions

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Аннотация

Mechanisms of self-organization of graphene oxide in aqueous dispersions during interaction with detonation nanodiamonds having different surface potential signs were studied using small-angle neutron scattering technique. Negatively charged graphene oxide, mixed with a hydrosol of positively charged diamonds, created a stable colloid due to the formation of planar heterostructures in the form of a pair of sheets, tightly connected through diamonds (weight fraction 25%) when the sheets were joined. Diamonds with a negative potential under similar conditions were localized between graphene sheets, forming at an increased fraction (44 wt. %) less dense assemblies with a gap between the sheets around a diamond particle radius. The binding of graphene oxide to diamonds was confirmed by transmission electron microscopy data.

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Авторлар туралы

V. Lebedev

Петербургский институт ядерной физики им. Б.П. Константинова, НИЦ «Курчатовский институт»

Email: kulvelis_yv@pnpi.nrcki.ru
Ресей, Орлова Роща, 1, Гатчина, Ленинградская обл., 188300

Yu. Kulvelis

Петербургский институт ядерной физики им. Б.П. Константинова, НИЦ «Курчатовский институт»

Хат алмасуға жауапты Автор.
Email: kulvelis_yv@pnpi.nrcki.ru
Ресей, Орлова Роща, 1, Гатчина, Ленинградская обл., 188300

M. Rabchinskii

Физико-технический институт им. А.Ф. Иоффе

Email: kulvelis_yv@pnpi.nrcki.ru
Ресей, Политехническая ул., 26, Санкт-Петербург, 194021

A. Dideikin

Физико-технический институт им. А.Ф. Иоффе

Email: kulvelis_yv@pnpi.nrcki.ru
Ресей, Политехническая ул., 26, Санкт-Петербург, 194021

A. Shvidchenko

Физико-технический институт им. А.Ф. Иоффе

Email: kulvelis_yv@pnpi.nrcki.ru
Ресей, Политехническая ул., 26, Санкт-Петербург, 194021

B. Tudupova

Петербургский институт ядерной физики им. Б.П. Константинова, НИЦ «Курчатовский институт»; Физико-технический институт им. А.Ф. Иоффе

Email: kulvelis_yv@pnpi.nrcki.ru
Ресей, Орлова Роща, 1, Гатчина, Ленинградская обл., 188300; Политехническая ул., 26, Санкт-Петербург, 194021

V. Kuular

Петербургский институт ядерной физики им. Б.П. Константинова, НИЦ «Курчатовский институт»; Физико-технический институт им. А.Ф. Иоффе

Email: kulvelis_yv@pnpi.nrcki.ru
Ресей, Орлова Роща, 1, Гатчина, Ленинградская обл., 188300; Политехническая ул., 26, Санкт-Петербург, 194021

N. Yevlampieva

Санкт-Петербургский государственный университет

Email: kulvelis_yv@pnpi.nrcki.ru
Ресей, Университетская наб. 7/9, Санкт-Петербург, 199034

A. Kuklin

Объединенный институт ядерных исследований

Email: kulvelis_yv@pnpi.nrcki.ru

Лаборатория нейтронной физики им. И.М. Франка

Ресей, ул. Жолио-Кюри, 6, Дубна, Московская обл., 141980

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2. Fig. 1. IR spectra for GO (1) and hybrid structures of GO with diamonds DNDZ– (2) and DNDZ+ (3).

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3. Fig. 2. Images of OG sheets (a) and its composites with DNDZ– (b) and DNDZ+ (c) diamonds according to TEM data.

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4. Fig. 3. Momentum dependences of neutron scattering cross-sections σ(q) in GO dispersions (1) and water-based GO+DNDZ– and GO+DNDZ+ systems (2, 3). Straight lines show the behavior of the cross-sections σ(q) ~ q–2 and q–4. The crossover point (q*) is marked.

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5. Fig. 4. Data in the Short representation for the dispersion of GO (a) and binary systems with diamonds DNDZ– and DNDZ+ (b, c) at momenta q > 3 nm–1. Lines are spline functions of the experimental data.

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6. Fig. 5. Data in the Short representation for the dispersion of GO (a) and binary systems with diamonds DNDZ– and DNDZ+ (b, c) at momenta q ≤ 3 nm–1. Lines are spline functions of the experimental data.

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7. Fig. 6. Approximation of the scattering cross-sections σ(q) at momenta below the crossover point in the GO dispersion (data 1) and aqueous mixtures of GO with diamonds DND Z– and DND Z+ (data 2 and 3) by function (1)

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8. Fig. 7. Assemblies of GO with DND Z– and DND Z+ diamonds (a, b). Designations: G – gap between GO sheets, 2Lt – thickness of sheet layer, R – radius of diamond particle.

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9. Fig. 8. Approximation of the scattering cross-sections σ(q) of aqueous dispersions of GO (1) and its mixtures (2, 3) with diamonds DNDZ– and DNDZ+ by function (2) at high momenta.

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