Pressure induced changes in fractal structure of detonation nanodiamond powder by small-angle neutron scattering

2007 ◽  
Vol 16 (12) ◽  
pp. 2050-2053 ◽  
Author(s):  
M.V. Avdeev ◽  
V.L. Aksenov ◽  
L. Rosta
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Fractal Structure ◽  
Detonation Nanodiamond ◽  
Induced Changes

Structural Characteristics of Aqueous Dispersions of Detonation Nanodiamond and Their Aggregate Fractions as Revealed by Small-Angle Neutron Scattering

2014 ◽  
Vol 119 (1) ◽  
pp. 794-802 ◽  
Author(s):  
Oleksandr V. Tomchuk ◽  
Dmitry S. Volkov ◽  
Leonid A. Bulavin ◽  
Andrey V. Rogachev ◽  
Mikhail A. Proskurnin ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Structural Characteristics ◽  
Detonation Nanodiamond ◽  
Aqueous Dispersions ◽  
Aggregate Fractions

New insights into the flow and microstructural relaxation behavior of biphasic cellulose nanocrystal dispersions from RheoSANS

Soft Matter ◽  
2017 ◽  
Vol 13 (45) ◽  
pp. 8451-8462 ◽  
Author(s):  
Alexander D. Haywood ◽  
Katie M. Weigandt ◽  
Partha Saha ◽  
Matthew Noor ◽  
Micah J. Green ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Order Parameter ◽  
Relaxation Behavior ◽  
Cellulose Nanocrystal ◽  
Broad Applicability ◽  
Induced Changes

The combination of rheology and small angle neutron scattering enables new insights into shear induced changes in the order parameter of lyotropic cellulose nanocrystal dispersions; this technique has broad applicability to other lyotropic nanomaterial dispersions.

Small-angle neutron scattering investigation of the effect of a heat-treatment on the microstructure of porous basalt rocks

2006 ◽  
Vol 70 (6) ◽  
pp. 689-695 ◽  
Author(s):  
A. Kahle ◽  
B. Winkler ◽  
A. Radulescu
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Fractal Structure ◽  
Pore Space ◽  
Internal Surface ◽  
Effect Of Temperature ◽  
Surface Areas ◽  
Heat Treated ◽  
Rock Microstructure

AbstractSmall-angle neutron scattering has been used to study the microstructure of natural porous basalt rocks. The effect of temperature on the rock microstructure has been investigated on ‘as received’ and heat-treated basalts. The magnitudes of α, the power-law scattering exponent were between 3 and 4 for the majority of the rocks, indicating a surface fractal structure between the basalt matrix and the pore space. Heat-treated basalts show higher α values, and therefore a smoother pore surface. Internal surface areas were determined for all basalts depending on the thermal history.

On the structure of concentrated detonation nanodiamond hydrosols with a positive ζ potential: Analysis of small-angle neutron scattering

2016 ◽  
Vol 658 ◽  
pp. 58-62 ◽  
Author(s):  
Mikhail V. Avdeev ◽  
Oleksandr V. Tomchuk ◽  
Oleksandr I. Ivankov ◽  
Alexander E. Alexenskii ◽  
Artur T. Dideikin ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Detonation Nanodiamond ◽  
Potential Analysis ◽  
Ζ Potential

Experiments on the structure and vibrations of fractal solids

1989 ◽  
Vol 423 (1864) ◽  
pp. 55-69 ◽  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Fractal Structure ◽  
Inelastic Neutron Scattering ◽  
Silica Aerogels ◽  
Inelastic Neutron ◽  
Collective Vibrations

Measurements performed on carefully prepared series of silica aerogels are reported. These materials were studied with small-angle neutron scattering, revealing a fractal structure that can extend up to at least two orders of magnitude in length. The corresponding collective vibrations were investigated by Brillouin, Raman, and inelastic neutron scattering. All results are consistently explained in terms of fractons.

scholarly journals The spatial diamond–graphite transition in detonation nanodiamond as revealed by small-angle neutron scattering

2013 ◽  
Vol 25 (44) ◽  
pp. 445001 ◽  
Author(s):  
Mikhail V Avdeev ◽  
Victor L Aksenov ◽  
Oleksandr V Tomchuk ◽  
Leonid A Bulavin ◽  
Vasil M Garamus ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Detonation Nanodiamond

scholarly journals Small-angle neutron scattering (SANS) and spin-echo SANS measurements reveal the logarithmic fractal structure of the large-scale chromatin organization in HeLa nuclei

2019 ◽  
Vol 52 (4) ◽  
pp. 844-853 ◽  
Author(s):  
Ekaterina G. Iashina ◽  
Mikhail V. Filatov ◽  
Rimma A. Pantina ◽  
Elena Yu. Varfolomeeva ◽  
Wim G. Bouwman ◽  
...  
Keyword(s):  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Large Scale ◽  
Fractal Structure ◽  
Water Solution ◽  
Spin Echo ◽  
High Surface ◽  
Chromatin Organization ◽  
Structural Level

This paper reports on the two-scale fractal structure of chromatin organization in the nucleus of the HeLa cell. Two neutron scattering methods, small-angle neutron scattering (SANS) and spin-echo SANS, are used to unambiguously identify the large-scale structure as being a logarithmic fractal with the correlation function γ(r) ∼ ln(r/ξ). The smaller-scale structural level is shown to be a volume fractal with dimension D F = 2.41. By definition, the volume fractal is self-similar at different scales, while the logarithmic fractal is hierarchically changed upon scaling. As a result, the logarithmic fractal is more compact than the volume fractal but still has a rather high surface area, which provides accessibility at all length scales. Apparently such bi-fractal chromatin organization is the result of an evolutionary process of optimizing the compactness and accessibility of gene packing. As they are in a water solution, the HeLa nuclei tend to agglomerate over time. The large-scale logarithmic fractal structure of chromatin provides the HeLa nucleus with the possibility of penetrating deeply into the adjacent nucleus during the agglomeration process. The interpenetration phenomenon of the HeLa nuclei shows that the chromatin-free space of one nucleus is not negligible but is as large as the volume occupied by chromatin itself. It is speculated that it is the logarithmic fractal architecture of chromatin that provides a comfortable compartment for this most important function of the cell.

scholarly journals Contrast Variation Small Angle Neutron Scattering Investigation of Micro- and Nano-Sized TATB

Materials ◽  
2019 ◽  
Vol 12 (16) ◽  
pp. 2606 ◽  
Author(s):  
Panqi Song ◽  
Xiaoqing Tu ◽  
Liangfei Bai ◽  
Guangai Sun ◽  
Qiang Tian ◽  
...  
Keyword(s):  
Fractal Dimension ◽  
Neutron Scattering ◽  
Small Angle ◽  
Small Angle Neutron Scattering ◽  
Fractal Structure ◽  
External Surface ◽  
Contrast Variation ◽  
Surface Fractal Dimension ◽  
Surface Fractal ◽  
Structure Surface

Small angle neutron scattering (SANS) with contrast variation was used to characterize the fractal behavior and embedded porosity of micro/nano-sized 1,3,5-triamino-2,4,6-trinitrobenzene (TATB) crystallites, gauging the effects of particle sizes on the microstructural features. Scattering results reveal that the external surface of micro-sized TATB crystallites are continuous and smooth interfaces and their internal pores display a surface fractal structure (surface fractal dimension 2.15 < DS < 2.25), while the external surface of nano-sized TATB particles exhibit a surface fractal structure (surface fractal dimension 2.36 < DS < 2.55) and their internal pores show a two-level volume fractal structure (large voids consist of small voids). The voids volume fraction of nano-sized TATB particles are found increased distinctively when compared with micro-sized TATB particles on length scale between 1 nm and 100 nm. Specific surface areas are also estimated based on Porod law method, which are coincident with Brunauer-Emmett-Teller (BET) measurements. The contrast variation technique distinguishes the information of internal voids from external surface, suggesting SANS is a powerful tool for determining the microstructural features, which can be used to establish the relationship between microstructures and properties of micro/nano-energetic materials.

Sign in / Sign up

Export Citation Format

Share Document