Transition sol-gel in nanodiamond hydrosols

Vul, A. Ya.; Eidelman, E. D.; Aleksenskiy, A.E.; Shvidchenko, A. V.; Dideĭkin, A. T.; Yuferev, V. S.; Лебедев, В. Т.; Kulvelis, Yu. V.; Авдеев, М. В.

doi:10.1016/j.carbon.2016.12.007

Cited by 44 publications

(41 citation statements)

References 20 publications

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“…However that experiments used nanodiamond particles obtained by the milling method [6] having a sp 2 phase on the surface of the diamond particles. In the case of hydrosol produced by another method [14], we have observed a giant increase of viscosity at a concentration of diamond particles more than 4-5 wt % [21].…”

Section: Discussionmentioning

confidence: 84%

Neutron Study of Multilevel Structures of Diamond Gels

2016

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Abstract:The structure of a hydrogel consisting of diamond nanoparticles formed by the explosion method has been studied. Small angle neutron scattering has been used as a method for characterization of the gel. Joint approaches for data analysis in reciprocal and direct space have been developed to restore a multilevel structure. The pristine hydrogel of positively charged diamond particles (~5 nm in size, concentration~5 wt %), even by four-fold dilution below its formation critical point, (C*~4 wt %) retains practically the original structure where single particles are joined into small groups integrated into chain fractal-type aggregates creating a network. This indicates a local stability of the gel and means a transformation of continuous gel into a system of micro-domains suspended in water. A perfection of the diamond crystals' facets was revealed that is of principal importance for the configuration of potentials, inducing the diamonds' electrostatic attraction due to different electric charges of facets. It is distinguished from the results for the suspensions of diamonds in graphene shells that showed a deviation of scattering from Porod's law.

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Section: Discussionmentioning

confidence: 84%

Neutron Study of Multilevel Structures of Diamond Gels

2016

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“…The DLS signal from nonaggregated ≈5 nm particles takes place even in the gel state. 4 While the particle size from DLS and SANS is close, in the latter case the scattering curves at the particle level (j = 1) do not distinguish whether the particles are isolated or grouped in clusters. The ∼20 nm clusters at the next level (j = 2) from SANS measurements are also detected by DLS in sols.…”

Section: Discussionmentioning

confidence: 92%

Sol–Gel Transition in Nanodiamond Aqueous Dispersions by Small-Angle Scattering

et al. 2019

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This paper reports the results of the comparative structural characterization of detonation nanodiamond particles and their aggregates in hydrosols and hydrogels by small-angle scattering (SAS) techniques. The data from different neutron and X-ray (synchrotron radiation) diffractometers cover a wide range of momentum transfer and show multilevel structure organizations at the size scale from 1 to 1000 nm and higher. For this purpose, in addition to the conventional SAS techniques the methods of very small-angle and ultrasmall-angle neutron scattering were applied. The fraction of nanodiamond particles in the aggregates is determined. A complex two-step mechanism of nanodiamond cluster association into a network during the sol–gel transition is revealed. It is assumed that a reason for the reversibility of this process is a different compactness of the corresponding structural levels defined by different fractal organizations.

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“…The detailed information about Z0, Z+ and Z-samples is given in Refs. 12,31 . Also, nanodiamonds of laser synthesis (Laser) 32 and nanodiamonds made by milling (Milling) 24,25 were studied.…”

Section: A Samplesmentioning

confidence: 99%

Ultracentrifugation for ultrafine nanodiamond fractionation

Koniakhin

Besedina

Kirilenko

et al. 2018

Superlattices and Microstructures

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In this paper we propose a method for ultrafine fractionation of nanodiamonds using the differential centrifugation in the fields up to 215000g. The developed protocols yield 4-6 nm fraction giving main contribution to the light scattering intensity. The desired 4-6 nm fraction can be obtained from various types of initial nanodiamonds: three types of detonation nanodiamonds differing in purifying methods, laser synthesis nanodiamonds and nanodiamonds made by milling. The characterization of the obtained hydrosols was conducted with Dynamic Light Scattering, Zeta potential measurements, powder XRD and TEM. According to powder XRD and TEM data ultracentrifugation also leads to a further fractionation of the primary diamond nanocrystallites in the hydrosols from 4 to 2 nm.

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Transition sol-gel in nanodiamond hydrosols

Cited by 44 publications

References 20 publications

Neutron Study of Multilevel Structures of Diamond Gels

Neutron Study of Multilevel Structures of Diamond Gels

Sol–Gel Transition in Nanodiamond Aqueous Dispersions by Small-Angle Scattering

Ultracentrifugation for ultrafine nanodiamond fractionation

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