High-Pressure Design of Advanced BN-Based Materials

Kurakevych, Oleksandr O.; Solozhenko, Vladimir L.

doi:10.3390/molecules21101399

Cited by 27 publications

(21 citation statements)

References 89 publications

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“…Mulberry ( Morus alba L.) is moraceous plant that holds a long history of cultivation, mainly in Asian countries. Its leaves and fruits are usually consumed as a food or food additive, and are also used in folklore medicine [ 1 , 2 ]. Mulberry leaves are recognized as the sole food source for silkworms, which are prosperous in the silk industry; they are also commonly used as anti-diabetic, hypolipidemic, anti-hypertensive, anti-atherosclerotic, and anti-convulsant agents [ 3 , 4 , 5 , 6 , 7 , 8 , 9 , 10 ].…”

Section: Introductionmentioning

confidence: 99%

Thermal and Antioxidant Properties of Polysaccharides Sequentially Extracted from Mulberry Leaves (Morus alba L.)

et al. 2017

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Polysaccharides from natural plant products are gaining considerable attention due to their multi-faceted health effects, as well their functional applications in food production. We reported the sequential extraction of mulberry leaf polysaccharides (MLPs) with hot buffer (HBSS), chelating agent (CHSS), dilute alkali (DASS) and concentrated alkali (CASS), in order to obtain polysaccharide fractions. Monosaccharide analysis proved that galactose (27.07%) and arabinose (25.99%) were the major sugars in HBSS, whereas arabinose (30.55%) was the major sugar in CHSS, and glucose was the major sugar in DASS (24.96%) and CASS (27.51%). The molecular weights of the polysaccharide fractions were 7.812 × 103 (HBSS), 3.279 × 103 (CHSS), 6.912 × 103 (DASS), and 1.408 × 103 kDa (CASS). HBSS and CASS showed the largest peak temperature and the highest endothermic enthalpy, respectively. Different antioxidant assays showed that the MLPs possessed appreciable antioxidant activities in a dose-dependent manner. At 5 mg/mL, HBSS and DASS possessed the largest 2,2-diphenyl-1-picryl-hydrazyl-hydrate (DPPH) radical scavenging activity (96.82%). HBSS exhibited the highest reducing power, and DASS rendered the strongest ABTS radical scavenging activity (99.69%). CHSS performed the best hydroxyl radical scavenging activity (64.22%) and Fe2+-chelating ability (96.36%). Our results suggested that MLPs could be a promising source of natural antioxidants for use in the food, pharmaceutical, and cosmetic industries.

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Section: Introductionmentioning

confidence: 99%

Thermal and Antioxidant Properties of Polysaccharides Sequentially Extracted from Mulberry Leaves (Morus alba L.)

et al. 2017

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“…The high-pressure experiments at 1.5-8 GPa (according to the hBN equation of state) 20 with direct temperature measurements were carried out using the multianvil X-ray system MAX80 21 with anvils of tungsten carbide. The diffraction measurements were performed in energy-dispersive mode at beamline F2.1 (HASYLAB-DESY, Hamburg).…”

Section: Methodsmentioning

confidence: 99%

Thermoelastic equation of state and melting of Mg metal at high pressure and high temperature

Courac

Godec

Solozhenko³

et al. 2020

Journal of Applied Physics

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The p-V-T equation of state of magnesium metal has been measured up to 20 GPa and 1500 K using both multianvil and opposite anvil techniques combined with synchrotron X-ray diffraction. To fit the experimental data, the model of Anderson-Grüneisen has been used with fixed parameter δ T . The 300-K bulk modulus of B 0 = 32.5(1) GPa and its first pressure derivative, B 0 ' = 3.73(2), have been obtained by fitting available data up to 20 GPa to Murnaghan equation of state. Thermal expansion at ambient pressure has been described using second order polynomial with coefficients a = 25(2)×10 -6 K -1 and b = 9.4(4)×10 -9 K -2 . The parameter describing simultaneous pressure and temperature impact on thermal expansion coefficient (and, therefore, volume) is δ T = 1.5(5). The good agreement between fitted and experimental isobars has been achieved to relative volumes of 0.75. The Mg melting observed by X-ray diffraction and in situ electrical resistivity measurements confirms previous results and additionally confirms the p-T estimations in the vicinity of melting.

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“…In comparison, graphite-like hBN and pBN with more flattened layers readily form nanograined cBN but hardly form the ubiquitous nanotwin microstructure [5,6]. Therefore, the structural features of starting materials would determine the microstructure of the transformed products in BN system [5,6,8,9,16,17]. In addition, the size effect of precursor is important, e.g., TiO 2 anatase nanocrystals exhibit strong size-dependent phase selectivity at high pressure [18].…”

Section: Introductionmentioning

confidence: 99%

Small onion-like BN leads to ultrafine-twinned cubic BN

Luo

Zhang

et al. 2019

Sci. China Mater.

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Nanotwinned cubic boron nitride (nt-cBN) with remarkable hardness, toughness, and stability has attracted widespread attention due to its distinct scientific and industrial importance. The key for nt-cBN synthesis is to adopt an onion-like BN (oBN) nano-precursor and induce phase transition under high pressure. Here, we found that the size change of oBN used greatly affected the mechanical performance of products. With the precursor size decreasing from 320 to 90 nm, the Vickers hardness of nanostructured products improved from 61 to 108 GPa, due to the fact that large oBN nanoparticles possessed more flattened, orderly and graphite-like shell layers, in sharp contrast to the highly wrinkled and imperfect layers in small-diameter nanoparticles, thus resulting in the apparent reduction of ultrafinetwin substructure in the synthetic products. This study reveals that only small oBN precursor could produce complete ultrafine nt-cBN with outstanding performance. A practical route was proposed to further improve the performance of this important material.

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High-Pressure Design of Advanced BN-Based Materials

Cited by 27 publications

References 89 publications

Thermal and Antioxidant Properties of Polysaccharides Sequentially Extracted from Mulberry Leaves (Morus alba L.)

Thermal and Antioxidant Properties of Polysaccharides Sequentially Extracted from Mulberry Leaves (Morus alba L.)

Thermoelastic equation of state and melting of Mg metal at high pressure and high temperature

Small onion-like BN leads to ultrafine-twinned cubic BN

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