Insights into the Solution Processing of Non-van der Waals Boron Carbide.

IF 3.9 2区化学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Chemistry - A European Journal Pub Date : 2024-11-28 DOI:10.1002/chem.202403328

Priyabrata Sahoo, Kenneth Lobo, Vijaya Kumar Gangaiah, Priyanka Sumbe, Mahendra A More, Dattatray J Late, Kiran Vankayala, H S S Ramakrishna Matte

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Abstract

Exfoliation of non-layered materials is crucial to unleash their enormous potential in wide range of applications. However, the presence of strong non-van der Waals interactions in all three dimensions makes exfoliation challenging. Boron carbide (B4C), known for its high hardness, holds great potential for diverse applications. In this work, B4C is exfoliated in 29 solvents to determine its Hansen solubility parameters (HSP) and understand the dispersion stability. The experimentally determined HSP values are 19.6, 15.3 and 15.1 MPa1/2 for dispersive interactions (δD), polar interactions (δP) and hydrogen bonding interactions (δH), respectively. Subsequently, in situ dispersion stability is analyzed qualitatively and quantitatively from the space-time resolved extinction profiles employing an analytical centrifuge. The sedimentation kinetics of B4C dispersions are analyzed using instability index, integral extinction and sedimentation velocity. B4C dispersions in solvents like ε-caprolactone, isopropyl alcohol, propylene carbonate and formamide exhibited excellent stability. Additionally, B4C nanosheets are utilized to investigate their field emission properties. These nanosheets exhibit a turn-on electric field of 3.35 V/μm at an emission current density of 1 μA cm-2, and it delivered a large emission current density of ~ 375 μA cm-2 at an applied electric field of 5.7 V/μm.

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对非范德华碳化硼溶液加工的见解。

非层状材料的剥离对于释放其在广泛应用中的巨大潜力至关重要。然而，由于所有三个维度都存在很强的非范德华相互作用，使得剥离具有挑战性。碳化硼（B4C）以高硬度著称，在各种应用中具有巨大潜力。在这项工作中，B4C 在 29 种溶剂中剥离，以确定其汉森溶解度参数（HSP）并了解其分散稳定性。实验测定的分散相互作用（δD）、极性相互作用（δP）和氢键相互作用（δH）的 HSP 值分别为 19.6、15.3 和 15.1 MPa1/2。随后，利用分析离心机从时空分辨的消光曲线对原位分散稳定性进行定性和定量分析。利用不稳定指数、积分消光和沉降速度分析了 B4C 分散体的沉降动力学。在ε-己内酯、异丙醇、碳酸丙烯酯和甲酰胺等溶剂中的 B4C 分散体表现出优异的稳定性。此外，还利用 B4C 纳米片研究了它们的场发射特性。在 1 μA cm-2 的发射电流密度下，这些纳米片的开启电场为 3.35 V/μm；在 5.7 V/μm 的外加电场下，这些纳米片的发射电流密度高达约 375 μA cm-2。

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来源期刊

Chemistry - A European Journal 化学-化学综合

CiteScore

7.90

自引率

4.70%

发文量

1808

审稿时长

1.8 months

期刊介绍： Chemistry—A European Journal is a truly international journal with top quality contributions (2018 ISI Impact Factor: 5.16). It publishes a wide range of outstanding Reviews, Minireviews, Concepts, Full Papers, and Communications from all areas of chemistry and related fields. Based in Europe Chemistry—A European Journal provides an excellent platform for increasing the visibility of European chemistry as well as for featuring the best research from authors from around the world. All manuscripts are peer-reviewed, and electronic processing ensures accurate reproduction of text and data, plus short publication times. The Concepts section provides nonspecialist readers with a useful conceptual guide to unfamiliar areas and experts with new angles on familiar problems. Chemistry—A European Journal is published on behalf of ChemPubSoc Europe, a group of 16 national chemical societies from within Europe, and supported by the Asian Chemical Editorial Societies. The ChemPubSoc Europe family comprises: Angewandte Chemie, Chemistry—A European Journal, European Journal of Organic Chemistry, European Journal of Inorganic Chemistry, ChemPhysChem, ChemBioChem, ChemMedChem, ChemCatChem, ChemSusChem, ChemPlusChem, ChemElectroChem, and ChemistryOpen.