Small-Angle Neutron Scattering at the Pulsed Reactor IBR-2: Current Status and Prospects

Ivankov, Oleksandr I.; Rogachev, Andrey; Soloviov, Dmytro; Исламов, А. Х.; Skoi, V. V.; Kovalev, Yu. S.; Ryzykau, Yu. L.; Soloviev, A. G.; Kučerka, Norbert; Gordeliy, Valentin

doi:10.1134/s1063774521020085

Cited by 19 publications

(6 citation statements)

References 112 publications

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“…Small-angle neutron scattering (SANS) was performed at the YuMO instrument (Joint Institute for Nuclear Research, Dubna, Russia) in the range (dynamic range also [ 50 ]) of momentum transfer q = (4π/λ) sin(θ/2) = 0.07–6 nm −1 , where θ is the scattering angle, and the neutron wavelength is λ = 0.5–8 Å [ 51 ]. This q-range allows for revealing fine structure peculiarities on a scale of ~2π/q ~1–100 nm.…”

Section: Methodsmentioning

confidence: 99%

Improving PFSA Membranes Using Sulfonated Nanodiamonds

Shvidchenko,

Odinokov,

Primachenko

et al. 2023

Membranes

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Aquivion®-type perfluorosulfonic acid membranes with a polytetrafluoroethylene backbone and short side chains with sulfonic acid groups at the ends have great prospects for operating in hydrogen fuel cells. To improve the conducting properties of membranes, various types of nanofillers can be used. We prepared compositional Aquivion®-type membranes with embedded detonation nanodiamond particles. Nanodiamonds were chemically modified with sulfonic acid groups to increase the entire amount of ionogenic groups involved in the proton conductivity mechanism in compositional membranes. We demonstrated the rise of proton conductivity at 0.5–2 wt.% of sulfonated nanodiamonds in membranes, which was accompanied by good mechanical properties. The basic structural elements, conducting channels in membranes, were not destroyed in the presence of nanodiamonds, as follows from small-angle neutron scattering data. The prepared compositional membranes can be used in hydrogen fuel cells to achieve improved performance.

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Section: Methodsmentioning

confidence: 99%

Improving PFSA Membranes Using Sulfonated Nanodiamonds

Shvidchenko,

Odinokov,

Primachenko

et al. 2023

Membranes

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“…SANS experiments were performed on the YuMO spectrometer (IBR-2, Dubna, Russia) [ 57 ] with a two-detector system [ 58 , 59 ]. For SANS measurements, two samples of cF O F 1 were prepared.…”

Section: Methodsmentioning

confidence: 99%

I-Shaped Dimers of a Plant Chloroplast FOF1-ATP Synthase in Response to Changes in Ionic Strength

Osipov,

Ryzhykau,

Zinovev

et al. 2023

IJMS

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F-type ATP synthases play a key role in oxidative and photophosphorylation processes generating adenosine triphosphate (ATP) for most biochemical reactions in living organisms. In contrast to the mitochondrial FOF1-ATP synthases, those of chloroplasts are known to be mostly monomers with approx. 15% fraction of oligomers interacting presumably non-specifically in a thylakoid membrane. To shed light on the nature of this difference we studied interactions of the chloroplast ATP synthases using small-angle X-ray scattering (SAXS) method. Here, we report evidence of I-shaped dimerization of solubilized FOF1-ATP synthases from spinach chloroplasts at different ionic strengths. The structural data were obtained by SAXS and demonstrated dimerization in response to ionic strength. The best model describing SAXS data was two ATP-synthases connected through F1/F1′ parts, presumably via their δ-subunits, forming “I” shape dimers. Such I-shaped dimers might possibly connect the neighboring lamellae in thylakoid stacks assuming that the FOF1 monomers comprising such dimers are embedded in parallel opposing stacked thylakoid membrane areas. If this type of dimerization exists in nature, it might be one of the pathways of inhibition of chloroplast FOF1-ATP synthase for preventing ATP hydrolysis in the dark, when ionic strength in plant chloroplasts is rising. Together with a redox switch inserted into a γ-subunit of chloroplast FOF1 and lateral oligomerization, an I-shaped dimerization might comprise a subtle regulatory process of ATP synthesis and stabilize the structure of thylakoid stacks in chloroplasts.

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“…The wavelength distribution of the incident thermal neutron beam resembles a modified Maxwell distribution ranging from ~ 0.2 to 6 Å with a spectral distribution maximum at ~ 1.8 Å. A small-angle time-of-flight spectrometer YuMO was used, allowing to cover the scattering vector Q range 0.006–0.6 Å −1 ( Q = (4π/λ)sinθ, where λ is the neutron wavelength and 2θ is the scattering angle) 36 . Samples in powder form were loaded in aluminum cells and exposed to neutrons for approximately one hour at room temperature.…”

Section: Methodsmentioning

confidence: 99%

Gadolinium-oxide nanoparticles for cryogenic magnetocaloric applications

Zeleňáková

Hrubovčák

Berkutova

et al. 2022

Sci Rep

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The series of advanced nanocomposites consisting of Gd2O3 nanoparticles (NPs) embedded into periodic porous SiO2 matrix have been investigated with respect to their structural and magnetocaloric properties. By means of small angle neutron scattering and transmission electron microscopy, regular nanopores organized in the cubic or hexagonal superlattice have been documented. The pores are occupied by the NPs of progressive concentration within the nanocomposite series. All of the examined systems have exhibited extraordinarily high values of magnetic entropy change (up to 70 J kg−1 K−1) at low temperatures with the absence of thermal hysteresis, indicating their perspective utilization in cryogenic refrigeration. Profound analysis of magnetic entropy change data via scaling laws has been applied to the nanocomposite materials for the very first time. With the aid of scaling analysis, conclusions on magnetic properties and phase transition type have been made, even for the conditions unavailable in the laboratory.

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Small-Angle Neutron Scattering at the Pulsed Reactor IBR-2: Current Status and Prospects

Cited by 19 publications

References 112 publications

Improving PFSA Membranes Using Sulfonated Nanodiamonds

Improving PFSA Membranes Using Sulfonated Nanodiamonds

I-Shaped Dimers of a Plant Chloroplast FOF1-ATP Synthase in Response to Changes in Ionic Strength

Gadolinium-oxide nanoparticles for cryogenic magnetocaloric applications

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